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[mirror_ubuntu-bionic-kernel.git] / drivers / tty / synclink_gt.c
1 // SPDX-License-Identifier: GPL-1.0+
2 /*
3 * Device driver for Microgate SyncLink GT serial adapters.
4 *
5 * written by Paul Fulghum for Microgate Corporation
6 * paulkf@microgate.com
7 *
8 * Microgate and SyncLink are trademarks of Microgate Corporation
9 *
10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
11 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
12 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
13 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
14 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
15 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
16 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
17 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
18 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
19 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
20 * OF THE POSSIBILITY OF SUCH DAMAGE.
21 */
22
23 /*
24 * DEBUG OUTPUT DEFINITIONS
25 *
26 * uncomment lines below to enable specific types of debug output
27 *
28 * DBGINFO information - most verbose output
29 * DBGERR serious errors
30 * DBGBH bottom half service routine debugging
31 * DBGISR interrupt service routine debugging
32 * DBGDATA output receive and transmit data
33 * DBGTBUF output transmit DMA buffers and registers
34 * DBGRBUF output receive DMA buffers and registers
35 */
36
37 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
38 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
39 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
40 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
41 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
42 /*#define DBGTBUF(info) dump_tbufs(info)*/
43 /*#define DBGRBUF(info) dump_rbufs(info)*/
44
45
46 #include <linux/module.h>
47 #include <linux/errno.h>
48 #include <linux/signal.h>
49 #include <linux/sched.h>
50 #include <linux/timer.h>
51 #include <linux/interrupt.h>
52 #include <linux/pci.h>
53 #include <linux/tty.h>
54 #include <linux/tty_flip.h>
55 #include <linux/serial.h>
56 #include <linux/major.h>
57 #include <linux/string.h>
58 #include <linux/fcntl.h>
59 #include <linux/ptrace.h>
60 #include <linux/ioport.h>
61 #include <linux/mm.h>
62 #include <linux/seq_file.h>
63 #include <linux/slab.h>
64 #include <linux/netdevice.h>
65 #include <linux/vmalloc.h>
66 #include <linux/init.h>
67 #include <linux/delay.h>
68 #include <linux/ioctl.h>
69 #include <linux/termios.h>
70 #include <linux/bitops.h>
71 #include <linux/workqueue.h>
72 #include <linux/hdlc.h>
73 #include <linux/synclink.h>
74
75 #include <asm/io.h>
76 #include <asm/irq.h>
77 #include <asm/dma.h>
78 #include <asm/types.h>
79 #include <linux/uaccess.h>
80
81 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
82 #define SYNCLINK_GENERIC_HDLC 1
83 #else
84 #define SYNCLINK_GENERIC_HDLC 0
85 #endif
86
87 /*
88 * module identification
89 */
90 static char *driver_name = "SyncLink GT";
91 static char *slgt_driver_name = "synclink_gt";
92 static char *tty_dev_prefix = "ttySLG";
93 MODULE_LICENSE("GPL");
94 #define MGSL_MAGIC 0x5401
95 #define MAX_DEVICES 32
96
97 static const struct pci_device_id pci_table[] = {
98 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
99 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
100 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
101 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
102 {0,}, /* terminate list */
103 };
104 MODULE_DEVICE_TABLE(pci, pci_table);
105
106 static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
107 static void remove_one(struct pci_dev *dev);
108 static struct pci_driver pci_driver = {
109 .name = "synclink_gt",
110 .id_table = pci_table,
111 .probe = init_one,
112 .remove = remove_one,
113 };
114
115 static bool pci_registered;
116
117 /*
118 * module configuration and status
119 */
120 static struct slgt_info *slgt_device_list;
121 static int slgt_device_count;
122
123 static int ttymajor;
124 static int debug_level;
125 static int maxframe[MAX_DEVICES];
126
127 module_param(ttymajor, int, 0);
128 module_param(debug_level, int, 0);
129 module_param_array(maxframe, int, NULL, 0);
130
131 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
132 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
133 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
134
135 /*
136 * tty support and callbacks
137 */
138 static struct tty_driver *serial_driver;
139
140 static int open(struct tty_struct *tty, struct file * filp);
141 static void close(struct tty_struct *tty, struct file * filp);
142 static void hangup(struct tty_struct *tty);
143 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
144
145 static int write(struct tty_struct *tty, const unsigned char *buf, int count);
146 static int put_char(struct tty_struct *tty, unsigned char ch);
147 static void send_xchar(struct tty_struct *tty, char ch);
148 static void wait_until_sent(struct tty_struct *tty, int timeout);
149 static int write_room(struct tty_struct *tty);
150 static void flush_chars(struct tty_struct *tty);
151 static void flush_buffer(struct tty_struct *tty);
152 static void tx_hold(struct tty_struct *tty);
153 static void tx_release(struct tty_struct *tty);
154
155 static int ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
156 static int chars_in_buffer(struct tty_struct *tty);
157 static void throttle(struct tty_struct * tty);
158 static void unthrottle(struct tty_struct * tty);
159 static int set_break(struct tty_struct *tty, int break_state);
160
161 /*
162 * generic HDLC support and callbacks
163 */
164 #if SYNCLINK_GENERIC_HDLC
165 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
166 static void hdlcdev_tx_done(struct slgt_info *info);
167 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
168 static int hdlcdev_init(struct slgt_info *info);
169 static void hdlcdev_exit(struct slgt_info *info);
170 #endif
171
172
173 /*
174 * device specific structures, macros and functions
175 */
176
177 #define SLGT_MAX_PORTS 4
178 #define SLGT_REG_SIZE 256
179
180 /*
181 * conditional wait facility
182 */
183 struct cond_wait {
184 struct cond_wait *next;
185 wait_queue_head_t q;
186 wait_queue_entry_t wait;
187 unsigned int data;
188 };
189 static void init_cond_wait(struct cond_wait *w, unsigned int data);
190 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
191 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
192 static void flush_cond_wait(struct cond_wait **head);
193
194 /*
195 * DMA buffer descriptor and access macros
196 */
197 struct slgt_desc
198 {
199 __le16 count;
200 __le16 status;
201 __le32 pbuf; /* physical address of data buffer */
202 __le32 next; /* physical address of next descriptor */
203
204 /* driver book keeping */
205 char *buf; /* virtual address of data buffer */
206 unsigned int pdesc; /* physical address of this descriptor */
207 dma_addr_t buf_dma_addr;
208 unsigned short buf_count;
209 };
210
211 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
212 #define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
213 #define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
214 #define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
215 #define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
216 #define desc_count(a) (le16_to_cpu((a).count))
217 #define desc_status(a) (le16_to_cpu((a).status))
218 #define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
219 #define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
220 #define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
221 #define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
222 #define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
223
224 struct _input_signal_events {
225 int ri_up;
226 int ri_down;
227 int dsr_up;
228 int dsr_down;
229 int dcd_up;
230 int dcd_down;
231 int cts_up;
232 int cts_down;
233 };
234
235 /*
236 * device instance data structure
237 */
238 struct slgt_info {
239 void *if_ptr; /* General purpose pointer (used by SPPP) */
240 struct tty_port port;
241
242 struct slgt_info *next_device; /* device list link */
243
244 int magic;
245
246 char device_name[25];
247 struct pci_dev *pdev;
248
249 int port_count; /* count of ports on adapter */
250 int adapter_num; /* adapter instance number */
251 int port_num; /* port instance number */
252
253 /* array of pointers to port contexts on this adapter */
254 struct slgt_info *port_array[SLGT_MAX_PORTS];
255
256 int line; /* tty line instance number */
257
258 struct mgsl_icount icount;
259
260 int timeout;
261 int x_char; /* xon/xoff character */
262 unsigned int read_status_mask;
263 unsigned int ignore_status_mask;
264
265 wait_queue_head_t status_event_wait_q;
266 wait_queue_head_t event_wait_q;
267 struct timer_list tx_timer;
268 struct timer_list rx_timer;
269
270 unsigned int gpio_present;
271 struct cond_wait *gpio_wait_q;
272
273 spinlock_t lock; /* spinlock for synchronizing with ISR */
274
275 struct work_struct task;
276 u32 pending_bh;
277 bool bh_requested;
278 bool bh_running;
279
280 int isr_overflow;
281 bool irq_requested; /* true if IRQ requested */
282 bool irq_occurred; /* for diagnostics use */
283
284 /* device configuration */
285
286 unsigned int bus_type;
287 unsigned int irq_level;
288 unsigned long irq_flags;
289
290 unsigned char __iomem * reg_addr; /* memory mapped registers address */
291 u32 phys_reg_addr;
292 bool reg_addr_requested;
293
294 MGSL_PARAMS params; /* communications parameters */
295 u32 idle_mode;
296 u32 max_frame_size; /* as set by device config */
297
298 unsigned int rbuf_fill_level;
299 unsigned int rx_pio;
300 unsigned int if_mode;
301 unsigned int base_clock;
302 unsigned int xsync;
303 unsigned int xctrl;
304
305 /* device status */
306
307 bool rx_enabled;
308 bool rx_restart;
309
310 bool tx_enabled;
311 bool tx_active;
312
313 unsigned char signals; /* serial signal states */
314 int init_error; /* initialization error */
315
316 unsigned char *tx_buf;
317 int tx_count;
318
319 char *flag_buf;
320 bool drop_rts_on_tx_done;
321 struct _input_signal_events input_signal_events;
322
323 int dcd_chkcount; /* check counts to prevent */
324 int cts_chkcount; /* too many IRQs if a signal */
325 int dsr_chkcount; /* is floating */
326 int ri_chkcount;
327
328 char *bufs; /* virtual address of DMA buffer lists */
329 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
330
331 unsigned int rbuf_count;
332 struct slgt_desc *rbufs;
333 unsigned int rbuf_current;
334 unsigned int rbuf_index;
335 unsigned int rbuf_fill_index;
336 unsigned short rbuf_fill_count;
337
338 unsigned int tbuf_count;
339 struct slgt_desc *tbufs;
340 unsigned int tbuf_current;
341 unsigned int tbuf_start;
342
343 unsigned char *tmp_rbuf;
344 unsigned int tmp_rbuf_count;
345
346 /* SPPP/Cisco HDLC device parts */
347
348 int netcount;
349 spinlock_t netlock;
350 #if SYNCLINK_GENERIC_HDLC
351 struct net_device *netdev;
352 #endif
353
354 };
355
356 static MGSL_PARAMS default_params = {
357 .mode = MGSL_MODE_HDLC,
358 .loopback = 0,
359 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
360 .encoding = HDLC_ENCODING_NRZI_SPACE,
361 .clock_speed = 0,
362 .addr_filter = 0xff,
363 .crc_type = HDLC_CRC_16_CCITT,
364 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
365 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
366 .data_rate = 9600,
367 .data_bits = 8,
368 .stop_bits = 1,
369 .parity = ASYNC_PARITY_NONE
370 };
371
372
373 #define BH_RECEIVE 1
374 #define BH_TRANSMIT 2
375 #define BH_STATUS 4
376 #define IO_PIN_SHUTDOWN_LIMIT 100
377
378 #define DMABUFSIZE 256
379 #define DESC_LIST_SIZE 4096
380
381 #define MASK_PARITY BIT1
382 #define MASK_FRAMING BIT0
383 #define MASK_BREAK BIT14
384 #define MASK_OVERRUN BIT4
385
386 #define GSR 0x00 /* global status */
387 #define JCR 0x04 /* JTAG control */
388 #define IODR 0x08 /* GPIO direction */
389 #define IOER 0x0c /* GPIO interrupt enable */
390 #define IOVR 0x10 /* GPIO value */
391 #define IOSR 0x14 /* GPIO interrupt status */
392 #define TDR 0x80 /* tx data */
393 #define RDR 0x80 /* rx data */
394 #define TCR 0x82 /* tx control */
395 #define TIR 0x84 /* tx idle */
396 #define TPR 0x85 /* tx preamble */
397 #define RCR 0x86 /* rx control */
398 #define VCR 0x88 /* V.24 control */
399 #define CCR 0x89 /* clock control */
400 #define BDR 0x8a /* baud divisor */
401 #define SCR 0x8c /* serial control */
402 #define SSR 0x8e /* serial status */
403 #define RDCSR 0x90 /* rx DMA control/status */
404 #define TDCSR 0x94 /* tx DMA control/status */
405 #define RDDAR 0x98 /* rx DMA descriptor address */
406 #define TDDAR 0x9c /* tx DMA descriptor address */
407 #define XSR 0x40 /* extended sync pattern */
408 #define XCR 0x44 /* extended control */
409
410 #define RXIDLE BIT14
411 #define RXBREAK BIT14
412 #define IRQ_TXDATA BIT13
413 #define IRQ_TXIDLE BIT12
414 #define IRQ_TXUNDER BIT11 /* HDLC */
415 #define IRQ_RXDATA BIT10
416 #define IRQ_RXIDLE BIT9 /* HDLC */
417 #define IRQ_RXBREAK BIT9 /* async */
418 #define IRQ_RXOVER BIT8
419 #define IRQ_DSR BIT7
420 #define IRQ_CTS BIT6
421 #define IRQ_DCD BIT5
422 #define IRQ_RI BIT4
423 #define IRQ_ALL 0x3ff0
424 #define IRQ_MASTER BIT0
425
426 #define slgt_irq_on(info, mask) \
427 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
428 #define slgt_irq_off(info, mask) \
429 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
430
431 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
432 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
433 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
434 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
435 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
436 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
437
438 static void msc_set_vcr(struct slgt_info *info);
439
440 static int startup(struct slgt_info *info);
441 static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
442 static void shutdown(struct slgt_info *info);
443 static void program_hw(struct slgt_info *info);
444 static void change_params(struct slgt_info *info);
445
446 static int register_test(struct slgt_info *info);
447 static int irq_test(struct slgt_info *info);
448 static int loopback_test(struct slgt_info *info);
449 static int adapter_test(struct slgt_info *info);
450
451 static void reset_adapter(struct slgt_info *info);
452 static void reset_port(struct slgt_info *info);
453 static void async_mode(struct slgt_info *info);
454 static void sync_mode(struct slgt_info *info);
455
456 static void rx_stop(struct slgt_info *info);
457 static void rx_start(struct slgt_info *info);
458 static void reset_rbufs(struct slgt_info *info);
459 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
460 static void rdma_reset(struct slgt_info *info);
461 static bool rx_get_frame(struct slgt_info *info);
462 static bool rx_get_buf(struct slgt_info *info);
463
464 static void tx_start(struct slgt_info *info);
465 static void tx_stop(struct slgt_info *info);
466 static void tx_set_idle(struct slgt_info *info);
467 static unsigned int free_tbuf_count(struct slgt_info *info);
468 static unsigned int tbuf_bytes(struct slgt_info *info);
469 static void reset_tbufs(struct slgt_info *info);
470 static void tdma_reset(struct slgt_info *info);
471 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count);
472
473 static void get_signals(struct slgt_info *info);
474 static void set_signals(struct slgt_info *info);
475 static void enable_loopback(struct slgt_info *info);
476 static void set_rate(struct slgt_info *info, u32 data_rate);
477
478 static int bh_action(struct slgt_info *info);
479 static void bh_handler(struct work_struct *work);
480 static void bh_transmit(struct slgt_info *info);
481 static void isr_serial(struct slgt_info *info);
482 static void isr_rdma(struct slgt_info *info);
483 static void isr_txeom(struct slgt_info *info, unsigned short status);
484 static void isr_tdma(struct slgt_info *info);
485
486 static int alloc_dma_bufs(struct slgt_info *info);
487 static void free_dma_bufs(struct slgt_info *info);
488 static int alloc_desc(struct slgt_info *info);
489 static void free_desc(struct slgt_info *info);
490 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
491 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
492
493 static int alloc_tmp_rbuf(struct slgt_info *info);
494 static void free_tmp_rbuf(struct slgt_info *info);
495
496 static void tx_timeout(unsigned long context);
497 static void rx_timeout(unsigned long context);
498
499 /*
500 * ioctl handlers
501 */
502 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
503 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
504 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
505 static int get_txidle(struct slgt_info *info, int __user *idle_mode);
506 static int set_txidle(struct slgt_info *info, int idle_mode);
507 static int tx_enable(struct slgt_info *info, int enable);
508 static int tx_abort(struct slgt_info *info);
509 static int rx_enable(struct slgt_info *info, int enable);
510 static int modem_input_wait(struct slgt_info *info,int arg);
511 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
512 static int tiocmget(struct tty_struct *tty);
513 static int tiocmset(struct tty_struct *tty,
514 unsigned int set, unsigned int clear);
515 static int set_break(struct tty_struct *tty, int break_state);
516 static int get_interface(struct slgt_info *info, int __user *if_mode);
517 static int set_interface(struct slgt_info *info, int if_mode);
518 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
519 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
520 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
521 static int get_xsync(struct slgt_info *info, int __user *if_mode);
522 static int set_xsync(struct slgt_info *info, int if_mode);
523 static int get_xctrl(struct slgt_info *info, int __user *if_mode);
524 static int set_xctrl(struct slgt_info *info, int if_mode);
525
526 /*
527 * driver functions
528 */
529 static void add_device(struct slgt_info *info);
530 static void device_init(int adapter_num, struct pci_dev *pdev);
531 static int claim_resources(struct slgt_info *info);
532 static void release_resources(struct slgt_info *info);
533
534 /*
535 * DEBUG OUTPUT CODE
536 */
537 #ifndef DBGINFO
538 #define DBGINFO(fmt)
539 #endif
540 #ifndef DBGERR
541 #define DBGERR(fmt)
542 #endif
543 #ifndef DBGBH
544 #define DBGBH(fmt)
545 #endif
546 #ifndef DBGISR
547 #define DBGISR(fmt)
548 #endif
549
550 #ifdef DBGDATA
551 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
552 {
553 int i;
554 int linecount;
555 printk("%s %s data:\n",info->device_name, label);
556 while(count) {
557 linecount = (count > 16) ? 16 : count;
558 for(i=0; i < linecount; i++)
559 printk("%02X ",(unsigned char)data[i]);
560 for(;i<17;i++)
561 printk(" ");
562 for(i=0;i<linecount;i++) {
563 if (data[i]>=040 && data[i]<=0176)
564 printk("%c",data[i]);
565 else
566 printk(".");
567 }
568 printk("\n");
569 data += linecount;
570 count -= linecount;
571 }
572 }
573 #else
574 #define DBGDATA(info, buf, size, label)
575 #endif
576
577 #ifdef DBGTBUF
578 static void dump_tbufs(struct slgt_info *info)
579 {
580 int i;
581 printk("tbuf_current=%d\n", info->tbuf_current);
582 for (i=0 ; i < info->tbuf_count ; i++) {
583 printk("%d: count=%04X status=%04X\n",
584 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
585 }
586 }
587 #else
588 #define DBGTBUF(info)
589 #endif
590
591 #ifdef DBGRBUF
592 static void dump_rbufs(struct slgt_info *info)
593 {
594 int i;
595 printk("rbuf_current=%d\n", info->rbuf_current);
596 for (i=0 ; i < info->rbuf_count ; i++) {
597 printk("%d: count=%04X status=%04X\n",
598 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
599 }
600 }
601 #else
602 #define DBGRBUF(info)
603 #endif
604
605 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
606 {
607 #ifdef SANITY_CHECK
608 if (!info) {
609 printk("null struct slgt_info for (%s) in %s\n", devname, name);
610 return 1;
611 }
612 if (info->magic != MGSL_MAGIC) {
613 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
614 return 1;
615 }
616 #else
617 if (!info)
618 return 1;
619 #endif
620 return 0;
621 }
622
623 /**
624 * line discipline callback wrappers
625 *
626 * The wrappers maintain line discipline references
627 * while calling into the line discipline.
628 *
629 * ldisc_receive_buf - pass receive data to line discipline
630 */
631 static void ldisc_receive_buf(struct tty_struct *tty,
632 const __u8 *data, char *flags, int count)
633 {
634 struct tty_ldisc *ld;
635 if (!tty)
636 return;
637 ld = tty_ldisc_ref(tty);
638 if (ld) {
639 if (ld->ops->receive_buf)
640 ld->ops->receive_buf(tty, data, flags, count);
641 tty_ldisc_deref(ld);
642 }
643 }
644
645 /* tty callbacks */
646
647 static int open(struct tty_struct *tty, struct file *filp)
648 {
649 struct slgt_info *info;
650 int retval, line;
651 unsigned long flags;
652
653 line = tty->index;
654 if (line >= slgt_device_count) {
655 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
656 return -ENODEV;
657 }
658
659 info = slgt_device_list;
660 while(info && info->line != line)
661 info = info->next_device;
662 if (sanity_check(info, tty->name, "open"))
663 return -ENODEV;
664 if (info->init_error) {
665 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
666 return -ENODEV;
667 }
668
669 tty->driver_data = info;
670 info->port.tty = tty;
671
672 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
673
674 mutex_lock(&info->port.mutex);
675 info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
676
677 spin_lock_irqsave(&info->netlock, flags);
678 if (info->netcount) {
679 retval = -EBUSY;
680 spin_unlock_irqrestore(&info->netlock, flags);
681 mutex_unlock(&info->port.mutex);
682 goto cleanup;
683 }
684 info->port.count++;
685 spin_unlock_irqrestore(&info->netlock, flags);
686
687 if (info->port.count == 1) {
688 /* 1st open on this device, init hardware */
689 retval = startup(info);
690 if (retval < 0) {
691 mutex_unlock(&info->port.mutex);
692 goto cleanup;
693 }
694 }
695 mutex_unlock(&info->port.mutex);
696 retval = block_til_ready(tty, filp, info);
697 if (retval) {
698 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
699 goto cleanup;
700 }
701
702 retval = 0;
703
704 cleanup:
705 if (retval) {
706 if (tty->count == 1)
707 info->port.tty = NULL; /* tty layer will release tty struct */
708 if(info->port.count)
709 info->port.count--;
710 }
711
712 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
713 return retval;
714 }
715
716 static void close(struct tty_struct *tty, struct file *filp)
717 {
718 struct slgt_info *info = tty->driver_data;
719
720 if (sanity_check(info, tty->name, "close"))
721 return;
722 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
723
724 if (tty_port_close_start(&info->port, tty, filp) == 0)
725 goto cleanup;
726
727 mutex_lock(&info->port.mutex);
728 if (tty_port_initialized(&info->port))
729 wait_until_sent(tty, info->timeout);
730 flush_buffer(tty);
731 tty_ldisc_flush(tty);
732
733 shutdown(info);
734 mutex_unlock(&info->port.mutex);
735
736 tty_port_close_end(&info->port, tty);
737 info->port.tty = NULL;
738 cleanup:
739 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
740 }
741
742 static void hangup(struct tty_struct *tty)
743 {
744 struct slgt_info *info = tty->driver_data;
745 unsigned long flags;
746
747 if (sanity_check(info, tty->name, "hangup"))
748 return;
749 DBGINFO(("%s hangup\n", info->device_name));
750
751 flush_buffer(tty);
752
753 mutex_lock(&info->port.mutex);
754 shutdown(info);
755
756 spin_lock_irqsave(&info->port.lock, flags);
757 info->port.count = 0;
758 info->port.tty = NULL;
759 spin_unlock_irqrestore(&info->port.lock, flags);
760 tty_port_set_active(&info->port, 0);
761 mutex_unlock(&info->port.mutex);
762
763 wake_up_interruptible(&info->port.open_wait);
764 }
765
766 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
767 {
768 struct slgt_info *info = tty->driver_data;
769 unsigned long flags;
770
771 DBGINFO(("%s set_termios\n", tty->driver->name));
772
773 change_params(info);
774
775 /* Handle transition to B0 status */
776 if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) {
777 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
778 spin_lock_irqsave(&info->lock,flags);
779 set_signals(info);
780 spin_unlock_irqrestore(&info->lock,flags);
781 }
782
783 /* Handle transition away from B0 status */
784 if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) {
785 info->signals |= SerialSignal_DTR;
786 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
787 info->signals |= SerialSignal_RTS;
788 spin_lock_irqsave(&info->lock,flags);
789 set_signals(info);
790 spin_unlock_irqrestore(&info->lock,flags);
791 }
792
793 /* Handle turning off CRTSCTS */
794 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
795 tty->hw_stopped = 0;
796 tx_release(tty);
797 }
798 }
799
800 static void update_tx_timer(struct slgt_info *info)
801 {
802 /*
803 * use worst case speed of 1200bps to calculate transmit timeout
804 * based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
805 */
806 if (info->params.mode == MGSL_MODE_HDLC) {
807 int timeout = (tbuf_bytes(info) * 7) + 1000;
808 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
809 }
810 }
811
812 static int write(struct tty_struct *tty,
813 const unsigned char *buf, int count)
814 {
815 int ret = 0;
816 struct slgt_info *info = tty->driver_data;
817 unsigned long flags;
818
819 if (sanity_check(info, tty->name, "write"))
820 return -EIO;
821
822 DBGINFO(("%s write count=%d\n", info->device_name, count));
823
824 if (!info->tx_buf || (count > info->max_frame_size))
825 return -EIO;
826
827 if (!count || tty->stopped || tty->hw_stopped)
828 return 0;
829
830 spin_lock_irqsave(&info->lock, flags);
831
832 if (info->tx_count) {
833 /* send accumulated data from send_char() */
834 if (!tx_load(info, info->tx_buf, info->tx_count))
835 goto cleanup;
836 info->tx_count = 0;
837 }
838
839 if (tx_load(info, buf, count))
840 ret = count;
841
842 cleanup:
843 spin_unlock_irqrestore(&info->lock, flags);
844 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
845 return ret;
846 }
847
848 static int put_char(struct tty_struct *tty, unsigned char ch)
849 {
850 struct slgt_info *info = tty->driver_data;
851 unsigned long flags;
852 int ret = 0;
853
854 if (sanity_check(info, tty->name, "put_char"))
855 return 0;
856 DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
857 if (!info->tx_buf)
858 return 0;
859 spin_lock_irqsave(&info->lock,flags);
860 if (info->tx_count < info->max_frame_size) {
861 info->tx_buf[info->tx_count++] = ch;
862 ret = 1;
863 }
864 spin_unlock_irqrestore(&info->lock,flags);
865 return ret;
866 }
867
868 static void send_xchar(struct tty_struct *tty, char ch)
869 {
870 struct slgt_info *info = tty->driver_data;
871 unsigned long flags;
872
873 if (sanity_check(info, tty->name, "send_xchar"))
874 return;
875 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
876 info->x_char = ch;
877 if (ch) {
878 spin_lock_irqsave(&info->lock,flags);
879 if (!info->tx_enabled)
880 tx_start(info);
881 spin_unlock_irqrestore(&info->lock,flags);
882 }
883 }
884
885 static void wait_until_sent(struct tty_struct *tty, int timeout)
886 {
887 struct slgt_info *info = tty->driver_data;
888 unsigned long orig_jiffies, char_time;
889
890 if (!info )
891 return;
892 if (sanity_check(info, tty->name, "wait_until_sent"))
893 return;
894 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
895 if (!tty_port_initialized(&info->port))
896 goto exit;
897
898 orig_jiffies = jiffies;
899
900 /* Set check interval to 1/5 of estimated time to
901 * send a character, and make it at least 1. The check
902 * interval should also be less than the timeout.
903 * Note: use tight timings here to satisfy the NIST-PCTS.
904 */
905
906 if (info->params.data_rate) {
907 char_time = info->timeout/(32 * 5);
908 if (!char_time)
909 char_time++;
910 } else
911 char_time = 1;
912
913 if (timeout)
914 char_time = min_t(unsigned long, char_time, timeout);
915
916 while (info->tx_active) {
917 msleep_interruptible(jiffies_to_msecs(char_time));
918 if (signal_pending(current))
919 break;
920 if (timeout && time_after(jiffies, orig_jiffies + timeout))
921 break;
922 }
923 exit:
924 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
925 }
926
927 static int write_room(struct tty_struct *tty)
928 {
929 struct slgt_info *info = tty->driver_data;
930 int ret;
931
932 if (sanity_check(info, tty->name, "write_room"))
933 return 0;
934 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
935 DBGINFO(("%s write_room=%d\n", info->device_name, ret));
936 return ret;
937 }
938
939 static void flush_chars(struct tty_struct *tty)
940 {
941 struct slgt_info *info = tty->driver_data;
942 unsigned long flags;
943
944 if (sanity_check(info, tty->name, "flush_chars"))
945 return;
946 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
947
948 if (info->tx_count <= 0 || tty->stopped ||
949 tty->hw_stopped || !info->tx_buf)
950 return;
951
952 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
953
954 spin_lock_irqsave(&info->lock,flags);
955 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
956 info->tx_count = 0;
957 spin_unlock_irqrestore(&info->lock,flags);
958 }
959
960 static void flush_buffer(struct tty_struct *tty)
961 {
962 struct slgt_info *info = tty->driver_data;
963 unsigned long flags;
964
965 if (sanity_check(info, tty->name, "flush_buffer"))
966 return;
967 DBGINFO(("%s flush_buffer\n", info->device_name));
968
969 spin_lock_irqsave(&info->lock, flags);
970 info->tx_count = 0;
971 spin_unlock_irqrestore(&info->lock, flags);
972
973 tty_wakeup(tty);
974 }
975
976 /*
977 * throttle (stop) transmitter
978 */
979 static void tx_hold(struct tty_struct *tty)
980 {
981 struct slgt_info *info = tty->driver_data;
982 unsigned long flags;
983
984 if (sanity_check(info, tty->name, "tx_hold"))
985 return;
986 DBGINFO(("%s tx_hold\n", info->device_name));
987 spin_lock_irqsave(&info->lock,flags);
988 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
989 tx_stop(info);
990 spin_unlock_irqrestore(&info->lock,flags);
991 }
992
993 /*
994 * release (start) transmitter
995 */
996 static void tx_release(struct tty_struct *tty)
997 {
998 struct slgt_info *info = tty->driver_data;
999 unsigned long flags;
1000
1001 if (sanity_check(info, tty->name, "tx_release"))
1002 return;
1003 DBGINFO(("%s tx_release\n", info->device_name));
1004 spin_lock_irqsave(&info->lock, flags);
1005 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
1006 info->tx_count = 0;
1007 spin_unlock_irqrestore(&info->lock, flags);
1008 }
1009
1010 /*
1011 * Service an IOCTL request
1012 *
1013 * Arguments
1014 *
1015 * tty pointer to tty instance data
1016 * cmd IOCTL command code
1017 * arg command argument/context
1018 *
1019 * Return 0 if success, otherwise error code
1020 */
1021 static int ioctl(struct tty_struct *tty,
1022 unsigned int cmd, unsigned long arg)
1023 {
1024 struct slgt_info *info = tty->driver_data;
1025 void __user *argp = (void __user *)arg;
1026 int ret;
1027
1028 if (sanity_check(info, tty->name, "ioctl"))
1029 return -ENODEV;
1030 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1031
1032 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1033 (cmd != TIOCMIWAIT)) {
1034 if (tty_io_error(tty))
1035 return -EIO;
1036 }
1037
1038 switch (cmd) {
1039 case MGSL_IOCWAITEVENT:
1040 return wait_mgsl_event(info, argp);
1041 case TIOCMIWAIT:
1042 return modem_input_wait(info,(int)arg);
1043 case MGSL_IOCSGPIO:
1044 return set_gpio(info, argp);
1045 case MGSL_IOCGGPIO:
1046 return get_gpio(info, argp);
1047 case MGSL_IOCWAITGPIO:
1048 return wait_gpio(info, argp);
1049 case MGSL_IOCGXSYNC:
1050 return get_xsync(info, argp);
1051 case MGSL_IOCSXSYNC:
1052 return set_xsync(info, (int)arg);
1053 case MGSL_IOCGXCTRL:
1054 return get_xctrl(info, argp);
1055 case MGSL_IOCSXCTRL:
1056 return set_xctrl(info, (int)arg);
1057 }
1058 mutex_lock(&info->port.mutex);
1059 switch (cmd) {
1060 case MGSL_IOCGPARAMS:
1061 ret = get_params(info, argp);
1062 break;
1063 case MGSL_IOCSPARAMS:
1064 ret = set_params(info, argp);
1065 break;
1066 case MGSL_IOCGTXIDLE:
1067 ret = get_txidle(info, argp);
1068 break;
1069 case MGSL_IOCSTXIDLE:
1070 ret = set_txidle(info, (int)arg);
1071 break;
1072 case MGSL_IOCTXENABLE:
1073 ret = tx_enable(info, (int)arg);
1074 break;
1075 case MGSL_IOCRXENABLE:
1076 ret = rx_enable(info, (int)arg);
1077 break;
1078 case MGSL_IOCTXABORT:
1079 ret = tx_abort(info);
1080 break;
1081 case MGSL_IOCGSTATS:
1082 ret = get_stats(info, argp);
1083 break;
1084 case MGSL_IOCGIF:
1085 ret = get_interface(info, argp);
1086 break;
1087 case MGSL_IOCSIF:
1088 ret = set_interface(info,(int)arg);
1089 break;
1090 default:
1091 ret = -ENOIOCTLCMD;
1092 }
1093 mutex_unlock(&info->port.mutex);
1094 return ret;
1095 }
1096
1097 static int get_icount(struct tty_struct *tty,
1098 struct serial_icounter_struct *icount)
1099
1100 {
1101 struct slgt_info *info = tty->driver_data;
1102 struct mgsl_icount cnow; /* kernel counter temps */
1103 unsigned long flags;
1104
1105 spin_lock_irqsave(&info->lock,flags);
1106 cnow = info->icount;
1107 spin_unlock_irqrestore(&info->lock,flags);
1108
1109 icount->cts = cnow.cts;
1110 icount->dsr = cnow.dsr;
1111 icount->rng = cnow.rng;
1112 icount->dcd = cnow.dcd;
1113 icount->rx = cnow.rx;
1114 icount->tx = cnow.tx;
1115 icount->frame = cnow.frame;
1116 icount->overrun = cnow.overrun;
1117 icount->parity = cnow.parity;
1118 icount->brk = cnow.brk;
1119 icount->buf_overrun = cnow.buf_overrun;
1120
1121 return 0;
1122 }
1123
1124 /*
1125 * support for 32 bit ioctl calls on 64 bit systems
1126 */
1127 #ifdef CONFIG_COMPAT
1128 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1129 {
1130 struct MGSL_PARAMS32 tmp_params;
1131
1132 DBGINFO(("%s get_params32\n", info->device_name));
1133 memset(&tmp_params, 0, sizeof(tmp_params));
1134 tmp_params.mode = (compat_ulong_t)info->params.mode;
1135 tmp_params.loopback = info->params.loopback;
1136 tmp_params.flags = info->params.flags;
1137 tmp_params.encoding = info->params.encoding;
1138 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
1139 tmp_params.addr_filter = info->params.addr_filter;
1140 tmp_params.crc_type = info->params.crc_type;
1141 tmp_params.preamble_length = info->params.preamble_length;
1142 tmp_params.preamble = info->params.preamble;
1143 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
1144 tmp_params.data_bits = info->params.data_bits;
1145 tmp_params.stop_bits = info->params.stop_bits;
1146 tmp_params.parity = info->params.parity;
1147 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1148 return -EFAULT;
1149 return 0;
1150 }
1151
1152 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1153 {
1154 struct MGSL_PARAMS32 tmp_params;
1155
1156 DBGINFO(("%s set_params32\n", info->device_name));
1157 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1158 return -EFAULT;
1159
1160 spin_lock(&info->lock);
1161 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
1162 info->base_clock = tmp_params.clock_speed;
1163 } else {
1164 info->params.mode = tmp_params.mode;
1165 info->params.loopback = tmp_params.loopback;
1166 info->params.flags = tmp_params.flags;
1167 info->params.encoding = tmp_params.encoding;
1168 info->params.clock_speed = tmp_params.clock_speed;
1169 info->params.addr_filter = tmp_params.addr_filter;
1170 info->params.crc_type = tmp_params.crc_type;
1171 info->params.preamble_length = tmp_params.preamble_length;
1172 info->params.preamble = tmp_params.preamble;
1173 info->params.data_rate = tmp_params.data_rate;
1174 info->params.data_bits = tmp_params.data_bits;
1175 info->params.stop_bits = tmp_params.stop_bits;
1176 info->params.parity = tmp_params.parity;
1177 }
1178 spin_unlock(&info->lock);
1179
1180 program_hw(info);
1181
1182 return 0;
1183 }
1184
1185 static long slgt_compat_ioctl(struct tty_struct *tty,
1186 unsigned int cmd, unsigned long arg)
1187 {
1188 struct slgt_info *info = tty->driver_data;
1189 int rc = -ENOIOCTLCMD;
1190
1191 if (sanity_check(info, tty->name, "compat_ioctl"))
1192 return -ENODEV;
1193 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1194
1195 switch (cmd) {
1196
1197 case MGSL_IOCSPARAMS32:
1198 rc = set_params32(info, compat_ptr(arg));
1199 break;
1200
1201 case MGSL_IOCGPARAMS32:
1202 rc = get_params32(info, compat_ptr(arg));
1203 break;
1204
1205 case MGSL_IOCGPARAMS:
1206 case MGSL_IOCSPARAMS:
1207 case MGSL_IOCGTXIDLE:
1208 case MGSL_IOCGSTATS:
1209 case MGSL_IOCWAITEVENT:
1210 case MGSL_IOCGIF:
1211 case MGSL_IOCSGPIO:
1212 case MGSL_IOCGGPIO:
1213 case MGSL_IOCWAITGPIO:
1214 case MGSL_IOCGXSYNC:
1215 case MGSL_IOCGXCTRL:
1216 case MGSL_IOCSTXIDLE:
1217 case MGSL_IOCTXENABLE:
1218 case MGSL_IOCRXENABLE:
1219 case MGSL_IOCTXABORT:
1220 case TIOCMIWAIT:
1221 case MGSL_IOCSIF:
1222 case MGSL_IOCSXSYNC:
1223 case MGSL_IOCSXCTRL:
1224 rc = ioctl(tty, cmd, arg);
1225 break;
1226 }
1227
1228 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1229 return rc;
1230 }
1231 #else
1232 #define slgt_compat_ioctl NULL
1233 #endif /* ifdef CONFIG_COMPAT */
1234
1235 /*
1236 * proc fs support
1237 */
1238 static inline void line_info(struct seq_file *m, struct slgt_info *info)
1239 {
1240 char stat_buf[30];
1241 unsigned long flags;
1242
1243 seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1244 info->device_name, info->phys_reg_addr,
1245 info->irq_level, info->max_frame_size);
1246
1247 /* output current serial signal states */
1248 spin_lock_irqsave(&info->lock,flags);
1249 get_signals(info);
1250 spin_unlock_irqrestore(&info->lock,flags);
1251
1252 stat_buf[0] = 0;
1253 stat_buf[1] = 0;
1254 if (info->signals & SerialSignal_RTS)
1255 strcat(stat_buf, "|RTS");
1256 if (info->signals & SerialSignal_CTS)
1257 strcat(stat_buf, "|CTS");
1258 if (info->signals & SerialSignal_DTR)
1259 strcat(stat_buf, "|DTR");
1260 if (info->signals & SerialSignal_DSR)
1261 strcat(stat_buf, "|DSR");
1262 if (info->signals & SerialSignal_DCD)
1263 strcat(stat_buf, "|CD");
1264 if (info->signals & SerialSignal_RI)
1265 strcat(stat_buf, "|RI");
1266
1267 if (info->params.mode != MGSL_MODE_ASYNC) {
1268 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1269 info->icount.txok, info->icount.rxok);
1270 if (info->icount.txunder)
1271 seq_printf(m, " txunder:%d", info->icount.txunder);
1272 if (info->icount.txabort)
1273 seq_printf(m, " txabort:%d", info->icount.txabort);
1274 if (info->icount.rxshort)
1275 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1276 if (info->icount.rxlong)
1277 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1278 if (info->icount.rxover)
1279 seq_printf(m, " rxover:%d", info->icount.rxover);
1280 if (info->icount.rxcrc)
1281 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1282 } else {
1283 seq_printf(m, "\tASYNC tx:%d rx:%d",
1284 info->icount.tx, info->icount.rx);
1285 if (info->icount.frame)
1286 seq_printf(m, " fe:%d", info->icount.frame);
1287 if (info->icount.parity)
1288 seq_printf(m, " pe:%d", info->icount.parity);
1289 if (info->icount.brk)
1290 seq_printf(m, " brk:%d", info->icount.brk);
1291 if (info->icount.overrun)
1292 seq_printf(m, " oe:%d", info->icount.overrun);
1293 }
1294
1295 /* Append serial signal status to end */
1296 seq_printf(m, " %s\n", stat_buf+1);
1297
1298 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1299 info->tx_active,info->bh_requested,info->bh_running,
1300 info->pending_bh);
1301 }
1302
1303 /* Called to print information about devices
1304 */
1305 static int synclink_gt_proc_show(struct seq_file *m, void *v)
1306 {
1307 struct slgt_info *info;
1308
1309 seq_puts(m, "synclink_gt driver\n");
1310
1311 info = slgt_device_list;
1312 while( info ) {
1313 line_info(m, info);
1314 info = info->next_device;
1315 }
1316 return 0;
1317 }
1318
1319 static int synclink_gt_proc_open(struct inode *inode, struct file *file)
1320 {
1321 return single_open(file, synclink_gt_proc_show, NULL);
1322 }
1323
1324 static const struct file_operations synclink_gt_proc_fops = {
1325 .owner = THIS_MODULE,
1326 .open = synclink_gt_proc_open,
1327 .read = seq_read,
1328 .llseek = seq_lseek,
1329 .release = single_release,
1330 };
1331
1332 /*
1333 * return count of bytes in transmit buffer
1334 */
1335 static int chars_in_buffer(struct tty_struct *tty)
1336 {
1337 struct slgt_info *info = tty->driver_data;
1338 int count;
1339 if (sanity_check(info, tty->name, "chars_in_buffer"))
1340 return 0;
1341 count = tbuf_bytes(info);
1342 DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1343 return count;
1344 }
1345
1346 /*
1347 * signal remote device to throttle send data (our receive data)
1348 */
1349 static void throttle(struct tty_struct * tty)
1350 {
1351 struct slgt_info *info = tty->driver_data;
1352 unsigned long flags;
1353
1354 if (sanity_check(info, tty->name, "throttle"))
1355 return;
1356 DBGINFO(("%s throttle\n", info->device_name));
1357 if (I_IXOFF(tty))
1358 send_xchar(tty, STOP_CHAR(tty));
1359 if (C_CRTSCTS(tty)) {
1360 spin_lock_irqsave(&info->lock,flags);
1361 info->signals &= ~SerialSignal_RTS;
1362 set_signals(info);
1363 spin_unlock_irqrestore(&info->lock,flags);
1364 }
1365 }
1366
1367 /*
1368 * signal remote device to stop throttling send data (our receive data)
1369 */
1370 static void unthrottle(struct tty_struct * tty)
1371 {
1372 struct slgt_info *info = tty->driver_data;
1373 unsigned long flags;
1374
1375 if (sanity_check(info, tty->name, "unthrottle"))
1376 return;
1377 DBGINFO(("%s unthrottle\n", info->device_name));
1378 if (I_IXOFF(tty)) {
1379 if (info->x_char)
1380 info->x_char = 0;
1381 else
1382 send_xchar(tty, START_CHAR(tty));
1383 }
1384 if (C_CRTSCTS(tty)) {
1385 spin_lock_irqsave(&info->lock,flags);
1386 info->signals |= SerialSignal_RTS;
1387 set_signals(info);
1388 spin_unlock_irqrestore(&info->lock,flags);
1389 }
1390 }
1391
1392 /*
1393 * set or clear transmit break condition
1394 * break_state -1=set break condition, 0=clear
1395 */
1396 static int set_break(struct tty_struct *tty, int break_state)
1397 {
1398 struct slgt_info *info = tty->driver_data;
1399 unsigned short value;
1400 unsigned long flags;
1401
1402 if (sanity_check(info, tty->name, "set_break"))
1403 return -EINVAL;
1404 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1405
1406 spin_lock_irqsave(&info->lock,flags);
1407 value = rd_reg16(info, TCR);
1408 if (break_state == -1)
1409 value |= BIT6;
1410 else
1411 value &= ~BIT6;
1412 wr_reg16(info, TCR, value);
1413 spin_unlock_irqrestore(&info->lock,flags);
1414 return 0;
1415 }
1416
1417 #if SYNCLINK_GENERIC_HDLC
1418
1419 /**
1420 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1421 * set encoding and frame check sequence (FCS) options
1422 *
1423 * dev pointer to network device structure
1424 * encoding serial encoding setting
1425 * parity FCS setting
1426 *
1427 * returns 0 if success, otherwise error code
1428 */
1429 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1430 unsigned short parity)
1431 {
1432 struct slgt_info *info = dev_to_port(dev);
1433 unsigned char new_encoding;
1434 unsigned short new_crctype;
1435
1436 /* return error if TTY interface open */
1437 if (info->port.count)
1438 return -EBUSY;
1439
1440 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1441
1442 switch (encoding)
1443 {
1444 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1445 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1446 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1447 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1448 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1449 default: return -EINVAL;
1450 }
1451
1452 switch (parity)
1453 {
1454 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1455 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1456 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1457 default: return -EINVAL;
1458 }
1459
1460 info->params.encoding = new_encoding;
1461 info->params.crc_type = new_crctype;
1462
1463 /* if network interface up, reprogram hardware */
1464 if (info->netcount)
1465 program_hw(info);
1466
1467 return 0;
1468 }
1469
1470 /**
1471 * called by generic HDLC layer to send frame
1472 *
1473 * skb socket buffer containing HDLC frame
1474 * dev pointer to network device structure
1475 */
1476 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1477 struct net_device *dev)
1478 {
1479 struct slgt_info *info = dev_to_port(dev);
1480 unsigned long flags;
1481
1482 DBGINFO(("%s hdlc_xmit\n", dev->name));
1483
1484 if (!skb->len)
1485 return NETDEV_TX_OK;
1486
1487 /* stop sending until this frame completes */
1488 netif_stop_queue(dev);
1489
1490 /* update network statistics */
1491 dev->stats.tx_packets++;
1492 dev->stats.tx_bytes += skb->len;
1493
1494 /* save start time for transmit timeout detection */
1495 netif_trans_update(dev);
1496
1497 spin_lock_irqsave(&info->lock, flags);
1498 tx_load(info, skb->data, skb->len);
1499 spin_unlock_irqrestore(&info->lock, flags);
1500
1501 /* done with socket buffer, so free it */
1502 dev_kfree_skb(skb);
1503
1504 return NETDEV_TX_OK;
1505 }
1506
1507 /**
1508 * called by network layer when interface enabled
1509 * claim resources and initialize hardware
1510 *
1511 * dev pointer to network device structure
1512 *
1513 * returns 0 if success, otherwise error code
1514 */
1515 static int hdlcdev_open(struct net_device *dev)
1516 {
1517 struct slgt_info *info = dev_to_port(dev);
1518 int rc;
1519 unsigned long flags;
1520
1521 if (!try_module_get(THIS_MODULE))
1522 return -EBUSY;
1523
1524 DBGINFO(("%s hdlcdev_open\n", dev->name));
1525
1526 /* generic HDLC layer open processing */
1527 rc = hdlc_open(dev);
1528 if (rc)
1529 return rc;
1530
1531 /* arbitrate between network and tty opens */
1532 spin_lock_irqsave(&info->netlock, flags);
1533 if (info->port.count != 0 || info->netcount != 0) {
1534 DBGINFO(("%s hdlc_open busy\n", dev->name));
1535 spin_unlock_irqrestore(&info->netlock, flags);
1536 return -EBUSY;
1537 }
1538 info->netcount=1;
1539 spin_unlock_irqrestore(&info->netlock, flags);
1540
1541 /* claim resources and init adapter */
1542 if ((rc = startup(info)) != 0) {
1543 spin_lock_irqsave(&info->netlock, flags);
1544 info->netcount=0;
1545 spin_unlock_irqrestore(&info->netlock, flags);
1546 return rc;
1547 }
1548
1549 /* assert RTS and DTR, apply hardware settings */
1550 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
1551 program_hw(info);
1552
1553 /* enable network layer transmit */
1554 netif_trans_update(dev);
1555 netif_start_queue(dev);
1556
1557 /* inform generic HDLC layer of current DCD status */
1558 spin_lock_irqsave(&info->lock, flags);
1559 get_signals(info);
1560 spin_unlock_irqrestore(&info->lock, flags);
1561 if (info->signals & SerialSignal_DCD)
1562 netif_carrier_on(dev);
1563 else
1564 netif_carrier_off(dev);
1565 return 0;
1566 }
1567
1568 /**
1569 * called by network layer when interface is disabled
1570 * shutdown hardware and release resources
1571 *
1572 * dev pointer to network device structure
1573 *
1574 * returns 0 if success, otherwise error code
1575 */
1576 static int hdlcdev_close(struct net_device *dev)
1577 {
1578 struct slgt_info *info = dev_to_port(dev);
1579 unsigned long flags;
1580
1581 DBGINFO(("%s hdlcdev_close\n", dev->name));
1582
1583 netif_stop_queue(dev);
1584
1585 /* shutdown adapter and release resources */
1586 shutdown(info);
1587
1588 hdlc_close(dev);
1589
1590 spin_lock_irqsave(&info->netlock, flags);
1591 info->netcount=0;
1592 spin_unlock_irqrestore(&info->netlock, flags);
1593
1594 module_put(THIS_MODULE);
1595 return 0;
1596 }
1597
1598 /**
1599 * called by network layer to process IOCTL call to network device
1600 *
1601 * dev pointer to network device structure
1602 * ifr pointer to network interface request structure
1603 * cmd IOCTL command code
1604 *
1605 * returns 0 if success, otherwise error code
1606 */
1607 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1608 {
1609 const size_t size = sizeof(sync_serial_settings);
1610 sync_serial_settings new_line;
1611 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1612 struct slgt_info *info = dev_to_port(dev);
1613 unsigned int flags;
1614
1615 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1616
1617 /* return error if TTY interface open */
1618 if (info->port.count)
1619 return -EBUSY;
1620
1621 if (cmd != SIOCWANDEV)
1622 return hdlc_ioctl(dev, ifr, cmd);
1623
1624 memset(&new_line, 0, sizeof(new_line));
1625
1626 switch(ifr->ifr_settings.type) {
1627 case IF_GET_IFACE: /* return current sync_serial_settings */
1628
1629 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1630 if (ifr->ifr_settings.size < size) {
1631 ifr->ifr_settings.size = size; /* data size wanted */
1632 return -ENOBUFS;
1633 }
1634
1635 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1636 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1637 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1638 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1639
1640 switch (flags){
1641 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1642 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1643 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1644 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1645 default: new_line.clock_type = CLOCK_DEFAULT;
1646 }
1647
1648 new_line.clock_rate = info->params.clock_speed;
1649 new_line.loopback = info->params.loopback ? 1:0;
1650
1651 if (copy_to_user(line, &new_line, size))
1652 return -EFAULT;
1653 return 0;
1654
1655 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1656
1657 if(!capable(CAP_NET_ADMIN))
1658 return -EPERM;
1659 if (copy_from_user(&new_line, line, size))
1660 return -EFAULT;
1661
1662 switch (new_line.clock_type)
1663 {
1664 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1665 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1666 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1667 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1668 case CLOCK_DEFAULT: flags = info->params.flags &
1669 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1670 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1671 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1672 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1673 default: return -EINVAL;
1674 }
1675
1676 if (new_line.loopback != 0 && new_line.loopback != 1)
1677 return -EINVAL;
1678
1679 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1680 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1681 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1682 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1683 info->params.flags |= flags;
1684
1685 info->params.loopback = new_line.loopback;
1686
1687 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1688 info->params.clock_speed = new_line.clock_rate;
1689 else
1690 info->params.clock_speed = 0;
1691
1692 /* if network interface up, reprogram hardware */
1693 if (info->netcount)
1694 program_hw(info);
1695 return 0;
1696
1697 default:
1698 return hdlc_ioctl(dev, ifr, cmd);
1699 }
1700 }
1701
1702 /**
1703 * called by network layer when transmit timeout is detected
1704 *
1705 * dev pointer to network device structure
1706 */
1707 static void hdlcdev_tx_timeout(struct net_device *dev)
1708 {
1709 struct slgt_info *info = dev_to_port(dev);
1710 unsigned long flags;
1711
1712 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1713
1714 dev->stats.tx_errors++;
1715 dev->stats.tx_aborted_errors++;
1716
1717 spin_lock_irqsave(&info->lock,flags);
1718 tx_stop(info);
1719 spin_unlock_irqrestore(&info->lock,flags);
1720
1721 netif_wake_queue(dev);
1722 }
1723
1724 /**
1725 * called by device driver when transmit completes
1726 * reenable network layer transmit if stopped
1727 *
1728 * info pointer to device instance information
1729 */
1730 static void hdlcdev_tx_done(struct slgt_info *info)
1731 {
1732 if (netif_queue_stopped(info->netdev))
1733 netif_wake_queue(info->netdev);
1734 }
1735
1736 /**
1737 * called by device driver when frame received
1738 * pass frame to network layer
1739 *
1740 * info pointer to device instance information
1741 * buf pointer to buffer contianing frame data
1742 * size count of data bytes in buf
1743 */
1744 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1745 {
1746 struct sk_buff *skb = dev_alloc_skb(size);
1747 struct net_device *dev = info->netdev;
1748
1749 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1750
1751 if (skb == NULL) {
1752 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1753 dev->stats.rx_dropped++;
1754 return;
1755 }
1756
1757 skb_put_data(skb, buf, size);
1758
1759 skb->protocol = hdlc_type_trans(skb, dev);
1760
1761 dev->stats.rx_packets++;
1762 dev->stats.rx_bytes += size;
1763
1764 netif_rx(skb);
1765 }
1766
1767 static const struct net_device_ops hdlcdev_ops = {
1768 .ndo_open = hdlcdev_open,
1769 .ndo_stop = hdlcdev_close,
1770 .ndo_start_xmit = hdlc_start_xmit,
1771 .ndo_do_ioctl = hdlcdev_ioctl,
1772 .ndo_tx_timeout = hdlcdev_tx_timeout,
1773 };
1774
1775 /**
1776 * called by device driver when adding device instance
1777 * do generic HDLC initialization
1778 *
1779 * info pointer to device instance information
1780 *
1781 * returns 0 if success, otherwise error code
1782 */
1783 static int hdlcdev_init(struct slgt_info *info)
1784 {
1785 int rc;
1786 struct net_device *dev;
1787 hdlc_device *hdlc;
1788
1789 /* allocate and initialize network and HDLC layer objects */
1790
1791 dev = alloc_hdlcdev(info);
1792 if (!dev) {
1793 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1794 return -ENOMEM;
1795 }
1796
1797 /* for network layer reporting purposes only */
1798 dev->mem_start = info->phys_reg_addr;
1799 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1800 dev->irq = info->irq_level;
1801
1802 /* network layer callbacks and settings */
1803 dev->netdev_ops = &hdlcdev_ops;
1804 dev->watchdog_timeo = 10 * HZ;
1805 dev->tx_queue_len = 50;
1806
1807 /* generic HDLC layer callbacks and settings */
1808 hdlc = dev_to_hdlc(dev);
1809 hdlc->attach = hdlcdev_attach;
1810 hdlc->xmit = hdlcdev_xmit;
1811
1812 /* register objects with HDLC layer */
1813 rc = register_hdlc_device(dev);
1814 if (rc) {
1815 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1816 free_netdev(dev);
1817 return rc;
1818 }
1819
1820 info->netdev = dev;
1821 return 0;
1822 }
1823
1824 /**
1825 * called by device driver when removing device instance
1826 * do generic HDLC cleanup
1827 *
1828 * info pointer to device instance information
1829 */
1830 static void hdlcdev_exit(struct slgt_info *info)
1831 {
1832 unregister_hdlc_device(info->netdev);
1833 free_netdev(info->netdev);
1834 info->netdev = NULL;
1835 }
1836
1837 #endif /* ifdef CONFIG_HDLC */
1838
1839 /*
1840 * get async data from rx DMA buffers
1841 */
1842 static void rx_async(struct slgt_info *info)
1843 {
1844 struct mgsl_icount *icount = &info->icount;
1845 unsigned int start, end;
1846 unsigned char *p;
1847 unsigned char status;
1848 struct slgt_desc *bufs = info->rbufs;
1849 int i, count;
1850 int chars = 0;
1851 int stat;
1852 unsigned char ch;
1853
1854 start = end = info->rbuf_current;
1855
1856 while(desc_complete(bufs[end])) {
1857 count = desc_count(bufs[end]) - info->rbuf_index;
1858 p = bufs[end].buf + info->rbuf_index;
1859
1860 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1861 DBGDATA(info, p, count, "rx");
1862
1863 for(i=0 ; i < count; i+=2, p+=2) {
1864 ch = *p;
1865 icount->rx++;
1866
1867 stat = 0;
1868
1869 status = *(p + 1) & (BIT1 + BIT0);
1870 if (status) {
1871 if (status & BIT1)
1872 icount->parity++;
1873 else if (status & BIT0)
1874 icount->frame++;
1875 /* discard char if tty control flags say so */
1876 if (status & info->ignore_status_mask)
1877 continue;
1878 if (status & BIT1)
1879 stat = TTY_PARITY;
1880 else if (status & BIT0)
1881 stat = TTY_FRAME;
1882 }
1883 tty_insert_flip_char(&info->port, ch, stat);
1884 chars++;
1885 }
1886
1887 if (i < count) {
1888 /* receive buffer not completed */
1889 info->rbuf_index += i;
1890 mod_timer(&info->rx_timer, jiffies + 1);
1891 break;
1892 }
1893
1894 info->rbuf_index = 0;
1895 free_rbufs(info, end, end);
1896
1897 if (++end == info->rbuf_count)
1898 end = 0;
1899
1900 /* if entire list searched then no frame available */
1901 if (end == start)
1902 break;
1903 }
1904
1905 if (chars)
1906 tty_flip_buffer_push(&info->port);
1907 }
1908
1909 /*
1910 * return next bottom half action to perform
1911 */
1912 static int bh_action(struct slgt_info *info)
1913 {
1914 unsigned long flags;
1915 int rc;
1916
1917 spin_lock_irqsave(&info->lock,flags);
1918
1919 if (info->pending_bh & BH_RECEIVE) {
1920 info->pending_bh &= ~BH_RECEIVE;
1921 rc = BH_RECEIVE;
1922 } else if (info->pending_bh & BH_TRANSMIT) {
1923 info->pending_bh &= ~BH_TRANSMIT;
1924 rc = BH_TRANSMIT;
1925 } else if (info->pending_bh & BH_STATUS) {
1926 info->pending_bh &= ~BH_STATUS;
1927 rc = BH_STATUS;
1928 } else {
1929 /* Mark BH routine as complete */
1930 info->bh_running = false;
1931 info->bh_requested = false;
1932 rc = 0;
1933 }
1934
1935 spin_unlock_irqrestore(&info->lock,flags);
1936
1937 return rc;
1938 }
1939
1940 /*
1941 * perform bottom half processing
1942 */
1943 static void bh_handler(struct work_struct *work)
1944 {
1945 struct slgt_info *info = container_of(work, struct slgt_info, task);
1946 int action;
1947
1948 info->bh_running = true;
1949
1950 while((action = bh_action(info))) {
1951 switch (action) {
1952 case BH_RECEIVE:
1953 DBGBH(("%s bh receive\n", info->device_name));
1954 switch(info->params.mode) {
1955 case MGSL_MODE_ASYNC:
1956 rx_async(info);
1957 break;
1958 case MGSL_MODE_HDLC:
1959 while(rx_get_frame(info));
1960 break;
1961 case MGSL_MODE_RAW:
1962 case MGSL_MODE_MONOSYNC:
1963 case MGSL_MODE_BISYNC:
1964 case MGSL_MODE_XSYNC:
1965 while(rx_get_buf(info));
1966 break;
1967 }
1968 /* restart receiver if rx DMA buffers exhausted */
1969 if (info->rx_restart)
1970 rx_start(info);
1971 break;
1972 case BH_TRANSMIT:
1973 bh_transmit(info);
1974 break;
1975 case BH_STATUS:
1976 DBGBH(("%s bh status\n", info->device_name));
1977 info->ri_chkcount = 0;
1978 info->dsr_chkcount = 0;
1979 info->dcd_chkcount = 0;
1980 info->cts_chkcount = 0;
1981 break;
1982 default:
1983 DBGBH(("%s unknown action\n", info->device_name));
1984 break;
1985 }
1986 }
1987 DBGBH(("%s bh_handler exit\n", info->device_name));
1988 }
1989
1990 static void bh_transmit(struct slgt_info *info)
1991 {
1992 struct tty_struct *tty = info->port.tty;
1993
1994 DBGBH(("%s bh_transmit\n", info->device_name));
1995 if (tty)
1996 tty_wakeup(tty);
1997 }
1998
1999 static void dsr_change(struct slgt_info *info, unsigned short status)
2000 {
2001 if (status & BIT3) {
2002 info->signals |= SerialSignal_DSR;
2003 info->input_signal_events.dsr_up++;
2004 } else {
2005 info->signals &= ~SerialSignal_DSR;
2006 info->input_signal_events.dsr_down++;
2007 }
2008 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2009 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2010 slgt_irq_off(info, IRQ_DSR);
2011 return;
2012 }
2013 info->icount.dsr++;
2014 wake_up_interruptible(&info->status_event_wait_q);
2015 wake_up_interruptible(&info->event_wait_q);
2016 info->pending_bh |= BH_STATUS;
2017 }
2018
2019 static void cts_change(struct slgt_info *info, unsigned short status)
2020 {
2021 if (status & BIT2) {
2022 info->signals |= SerialSignal_CTS;
2023 info->input_signal_events.cts_up++;
2024 } else {
2025 info->signals &= ~SerialSignal_CTS;
2026 info->input_signal_events.cts_down++;
2027 }
2028 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2029 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2030 slgt_irq_off(info, IRQ_CTS);
2031 return;
2032 }
2033 info->icount.cts++;
2034 wake_up_interruptible(&info->status_event_wait_q);
2035 wake_up_interruptible(&info->event_wait_q);
2036 info->pending_bh |= BH_STATUS;
2037
2038 if (tty_port_cts_enabled(&info->port)) {
2039 if (info->port.tty) {
2040 if (info->port.tty->hw_stopped) {
2041 if (info->signals & SerialSignal_CTS) {
2042 info->port.tty->hw_stopped = 0;
2043 info->pending_bh |= BH_TRANSMIT;
2044 return;
2045 }
2046 } else {
2047 if (!(info->signals & SerialSignal_CTS))
2048 info->port.tty->hw_stopped = 1;
2049 }
2050 }
2051 }
2052 }
2053
2054 static void dcd_change(struct slgt_info *info, unsigned short status)
2055 {
2056 if (status & BIT1) {
2057 info->signals |= SerialSignal_DCD;
2058 info->input_signal_events.dcd_up++;
2059 } else {
2060 info->signals &= ~SerialSignal_DCD;
2061 info->input_signal_events.dcd_down++;
2062 }
2063 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2064 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2065 slgt_irq_off(info, IRQ_DCD);
2066 return;
2067 }
2068 info->icount.dcd++;
2069 #if SYNCLINK_GENERIC_HDLC
2070 if (info->netcount) {
2071 if (info->signals & SerialSignal_DCD)
2072 netif_carrier_on(info->netdev);
2073 else
2074 netif_carrier_off(info->netdev);
2075 }
2076 #endif
2077 wake_up_interruptible(&info->status_event_wait_q);
2078 wake_up_interruptible(&info->event_wait_q);
2079 info->pending_bh |= BH_STATUS;
2080
2081 if (tty_port_check_carrier(&info->port)) {
2082 if (info->signals & SerialSignal_DCD)
2083 wake_up_interruptible(&info->port.open_wait);
2084 else {
2085 if (info->port.tty)
2086 tty_hangup(info->port.tty);
2087 }
2088 }
2089 }
2090
2091 static void ri_change(struct slgt_info *info, unsigned short status)
2092 {
2093 if (status & BIT0) {
2094 info->signals |= SerialSignal_RI;
2095 info->input_signal_events.ri_up++;
2096 } else {
2097 info->signals &= ~SerialSignal_RI;
2098 info->input_signal_events.ri_down++;
2099 }
2100 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2101 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2102 slgt_irq_off(info, IRQ_RI);
2103 return;
2104 }
2105 info->icount.rng++;
2106 wake_up_interruptible(&info->status_event_wait_q);
2107 wake_up_interruptible(&info->event_wait_q);
2108 info->pending_bh |= BH_STATUS;
2109 }
2110
2111 static void isr_rxdata(struct slgt_info *info)
2112 {
2113 unsigned int count = info->rbuf_fill_count;
2114 unsigned int i = info->rbuf_fill_index;
2115 unsigned short reg;
2116
2117 while (rd_reg16(info, SSR) & IRQ_RXDATA) {
2118 reg = rd_reg16(info, RDR);
2119 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
2120 if (desc_complete(info->rbufs[i])) {
2121 /* all buffers full */
2122 rx_stop(info);
2123 info->rx_restart = 1;
2124 continue;
2125 }
2126 info->rbufs[i].buf[count++] = (unsigned char)reg;
2127 /* async mode saves status byte to buffer for each data byte */
2128 if (info->params.mode == MGSL_MODE_ASYNC)
2129 info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
2130 if (count == info->rbuf_fill_level || (reg & BIT10)) {
2131 /* buffer full or end of frame */
2132 set_desc_count(info->rbufs[i], count);
2133 set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
2134 info->rbuf_fill_count = count = 0;
2135 if (++i == info->rbuf_count)
2136 i = 0;
2137 info->pending_bh |= BH_RECEIVE;
2138 }
2139 }
2140
2141 info->rbuf_fill_index = i;
2142 info->rbuf_fill_count = count;
2143 }
2144
2145 static void isr_serial(struct slgt_info *info)
2146 {
2147 unsigned short status = rd_reg16(info, SSR);
2148
2149 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2150
2151 wr_reg16(info, SSR, status); /* clear pending */
2152
2153 info->irq_occurred = true;
2154
2155 if (info->params.mode == MGSL_MODE_ASYNC) {
2156 if (status & IRQ_TXIDLE) {
2157 if (info->tx_active)
2158 isr_txeom(info, status);
2159 }
2160 if (info->rx_pio && (status & IRQ_RXDATA))
2161 isr_rxdata(info);
2162 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2163 info->icount.brk++;
2164 /* process break detection if tty control allows */
2165 if (info->port.tty) {
2166 if (!(status & info->ignore_status_mask)) {
2167 if (info->read_status_mask & MASK_BREAK) {
2168 tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2169 if (info->port.flags & ASYNC_SAK)
2170 do_SAK(info->port.tty);
2171 }
2172 }
2173 }
2174 }
2175 } else {
2176 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2177 isr_txeom(info, status);
2178 if (info->rx_pio && (status & IRQ_RXDATA))
2179 isr_rxdata(info);
2180 if (status & IRQ_RXIDLE) {
2181 if (status & RXIDLE)
2182 info->icount.rxidle++;
2183 else
2184 info->icount.exithunt++;
2185 wake_up_interruptible(&info->event_wait_q);
2186 }
2187
2188 if (status & IRQ_RXOVER)
2189 rx_start(info);
2190 }
2191
2192 if (status & IRQ_DSR)
2193 dsr_change(info, status);
2194 if (status & IRQ_CTS)
2195 cts_change(info, status);
2196 if (status & IRQ_DCD)
2197 dcd_change(info, status);
2198 if (status & IRQ_RI)
2199 ri_change(info, status);
2200 }
2201
2202 static void isr_rdma(struct slgt_info *info)
2203 {
2204 unsigned int status = rd_reg32(info, RDCSR);
2205
2206 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2207
2208 /* RDCSR (rx DMA control/status)
2209 *
2210 * 31..07 reserved
2211 * 06 save status byte to DMA buffer
2212 * 05 error
2213 * 04 eol (end of list)
2214 * 03 eob (end of buffer)
2215 * 02 IRQ enable
2216 * 01 reset
2217 * 00 enable
2218 */
2219 wr_reg32(info, RDCSR, status); /* clear pending */
2220
2221 if (status & (BIT5 + BIT4)) {
2222 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2223 info->rx_restart = true;
2224 }
2225 info->pending_bh |= BH_RECEIVE;
2226 }
2227
2228 static void isr_tdma(struct slgt_info *info)
2229 {
2230 unsigned int status = rd_reg32(info, TDCSR);
2231
2232 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2233
2234 /* TDCSR (tx DMA control/status)
2235 *
2236 * 31..06 reserved
2237 * 05 error
2238 * 04 eol (end of list)
2239 * 03 eob (end of buffer)
2240 * 02 IRQ enable
2241 * 01 reset
2242 * 00 enable
2243 */
2244 wr_reg32(info, TDCSR, status); /* clear pending */
2245
2246 if (status & (BIT5 + BIT4 + BIT3)) {
2247 // another transmit buffer has completed
2248 // run bottom half to get more send data from user
2249 info->pending_bh |= BH_TRANSMIT;
2250 }
2251 }
2252
2253 /*
2254 * return true if there are unsent tx DMA buffers, otherwise false
2255 *
2256 * if there are unsent buffers then info->tbuf_start
2257 * is set to index of first unsent buffer
2258 */
2259 static bool unsent_tbufs(struct slgt_info *info)
2260 {
2261 unsigned int i = info->tbuf_current;
2262 bool rc = false;
2263
2264 /*
2265 * search backwards from last loaded buffer (precedes tbuf_current)
2266 * for first unsent buffer (desc_count > 0)
2267 */
2268
2269 do {
2270 if (i)
2271 i--;
2272 else
2273 i = info->tbuf_count - 1;
2274 if (!desc_count(info->tbufs[i]))
2275 break;
2276 info->tbuf_start = i;
2277 rc = true;
2278 } while (i != info->tbuf_current);
2279
2280 return rc;
2281 }
2282
2283 static void isr_txeom(struct slgt_info *info, unsigned short status)
2284 {
2285 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2286
2287 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2288 tdma_reset(info);
2289 if (status & IRQ_TXUNDER) {
2290 unsigned short val = rd_reg16(info, TCR);
2291 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2292 wr_reg16(info, TCR, val); /* clear reset bit */
2293 }
2294
2295 if (info->tx_active) {
2296 if (info->params.mode != MGSL_MODE_ASYNC) {
2297 if (status & IRQ_TXUNDER)
2298 info->icount.txunder++;
2299 else if (status & IRQ_TXIDLE)
2300 info->icount.txok++;
2301 }
2302
2303 if (unsent_tbufs(info)) {
2304 tx_start(info);
2305 update_tx_timer(info);
2306 return;
2307 }
2308 info->tx_active = false;
2309
2310 del_timer(&info->tx_timer);
2311
2312 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2313 info->signals &= ~SerialSignal_RTS;
2314 info->drop_rts_on_tx_done = false;
2315 set_signals(info);
2316 }
2317
2318 #if SYNCLINK_GENERIC_HDLC
2319 if (info->netcount)
2320 hdlcdev_tx_done(info);
2321 else
2322 #endif
2323 {
2324 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2325 tx_stop(info);
2326 return;
2327 }
2328 info->pending_bh |= BH_TRANSMIT;
2329 }
2330 }
2331 }
2332
2333 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2334 {
2335 struct cond_wait *w, *prev;
2336
2337 /* wake processes waiting for specific transitions */
2338 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2339 if (w->data & changed) {
2340 w->data = state;
2341 wake_up_interruptible(&w->q);
2342 if (prev != NULL)
2343 prev->next = w->next;
2344 else
2345 info->gpio_wait_q = w->next;
2346 } else
2347 prev = w;
2348 }
2349 }
2350
2351 /* interrupt service routine
2352 *
2353 * irq interrupt number
2354 * dev_id device ID supplied during interrupt registration
2355 */
2356 static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2357 {
2358 struct slgt_info *info = dev_id;
2359 unsigned int gsr;
2360 unsigned int i;
2361
2362 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2363
2364 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2365 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2366 info->irq_occurred = true;
2367 for(i=0; i < info->port_count ; i++) {
2368 if (info->port_array[i] == NULL)
2369 continue;
2370 spin_lock(&info->port_array[i]->lock);
2371 if (gsr & (BIT8 << i))
2372 isr_serial(info->port_array[i]);
2373 if (gsr & (BIT16 << (i*2)))
2374 isr_rdma(info->port_array[i]);
2375 if (gsr & (BIT17 << (i*2)))
2376 isr_tdma(info->port_array[i]);
2377 spin_unlock(&info->port_array[i]->lock);
2378 }
2379 }
2380
2381 if (info->gpio_present) {
2382 unsigned int state;
2383 unsigned int changed;
2384 spin_lock(&info->lock);
2385 while ((changed = rd_reg32(info, IOSR)) != 0) {
2386 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2387 /* read latched state of GPIO signals */
2388 state = rd_reg32(info, IOVR);
2389 /* clear pending GPIO interrupt bits */
2390 wr_reg32(info, IOSR, changed);
2391 for (i=0 ; i < info->port_count ; i++) {
2392 if (info->port_array[i] != NULL)
2393 isr_gpio(info->port_array[i], changed, state);
2394 }
2395 }
2396 spin_unlock(&info->lock);
2397 }
2398
2399 for(i=0; i < info->port_count ; i++) {
2400 struct slgt_info *port = info->port_array[i];
2401 if (port == NULL)
2402 continue;
2403 spin_lock(&port->lock);
2404 if ((port->port.count || port->netcount) &&
2405 port->pending_bh && !port->bh_running &&
2406 !port->bh_requested) {
2407 DBGISR(("%s bh queued\n", port->device_name));
2408 schedule_work(&port->task);
2409 port->bh_requested = true;
2410 }
2411 spin_unlock(&port->lock);
2412 }
2413
2414 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2415 return IRQ_HANDLED;
2416 }
2417
2418 static int startup(struct slgt_info *info)
2419 {
2420 DBGINFO(("%s startup\n", info->device_name));
2421
2422 if (tty_port_initialized(&info->port))
2423 return 0;
2424
2425 if (!info->tx_buf) {
2426 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2427 if (!info->tx_buf) {
2428 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2429 return -ENOMEM;
2430 }
2431 }
2432
2433 info->pending_bh = 0;
2434
2435 memset(&info->icount, 0, sizeof(info->icount));
2436
2437 /* program hardware for current parameters */
2438 change_params(info);
2439
2440 if (info->port.tty)
2441 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2442
2443 tty_port_set_initialized(&info->port, 1);
2444
2445 return 0;
2446 }
2447
2448 /*
2449 * called by close() and hangup() to shutdown hardware
2450 */
2451 static void shutdown(struct slgt_info *info)
2452 {
2453 unsigned long flags;
2454
2455 if (!tty_port_initialized(&info->port))
2456 return;
2457
2458 DBGINFO(("%s shutdown\n", info->device_name));
2459
2460 /* clear status wait queue because status changes */
2461 /* can't happen after shutting down the hardware */
2462 wake_up_interruptible(&info->status_event_wait_q);
2463 wake_up_interruptible(&info->event_wait_q);
2464
2465 del_timer_sync(&info->tx_timer);
2466 del_timer_sync(&info->rx_timer);
2467
2468 kfree(info->tx_buf);
2469 info->tx_buf = NULL;
2470
2471 spin_lock_irqsave(&info->lock,flags);
2472
2473 tx_stop(info);
2474 rx_stop(info);
2475
2476 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2477
2478 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2479 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2480 set_signals(info);
2481 }
2482
2483 flush_cond_wait(&info->gpio_wait_q);
2484
2485 spin_unlock_irqrestore(&info->lock,flags);
2486
2487 if (info->port.tty)
2488 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2489
2490 tty_port_set_initialized(&info->port, 0);
2491 }
2492
2493 static void program_hw(struct slgt_info *info)
2494 {
2495 unsigned long flags;
2496
2497 spin_lock_irqsave(&info->lock,flags);
2498
2499 rx_stop(info);
2500 tx_stop(info);
2501
2502 if (info->params.mode != MGSL_MODE_ASYNC ||
2503 info->netcount)
2504 sync_mode(info);
2505 else
2506 async_mode(info);
2507
2508 set_signals(info);
2509
2510 info->dcd_chkcount = 0;
2511 info->cts_chkcount = 0;
2512 info->ri_chkcount = 0;
2513 info->dsr_chkcount = 0;
2514
2515 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2516 get_signals(info);
2517
2518 if (info->netcount ||
2519 (info->port.tty && info->port.tty->termios.c_cflag & CREAD))
2520 rx_start(info);
2521
2522 spin_unlock_irqrestore(&info->lock,flags);
2523 }
2524
2525 /*
2526 * reconfigure adapter based on new parameters
2527 */
2528 static void change_params(struct slgt_info *info)
2529 {
2530 unsigned cflag;
2531 int bits_per_char;
2532
2533 if (!info->port.tty)
2534 return;
2535 DBGINFO(("%s change_params\n", info->device_name));
2536
2537 cflag = info->port.tty->termios.c_cflag;
2538
2539 /* if B0 rate (hangup) specified then negate RTS and DTR */
2540 /* otherwise assert RTS and DTR */
2541 if (cflag & CBAUD)
2542 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
2543 else
2544 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2545
2546 /* byte size and parity */
2547
2548 switch (cflag & CSIZE) {
2549 case CS5: info->params.data_bits = 5; break;
2550 case CS6: info->params.data_bits = 6; break;
2551 case CS7: info->params.data_bits = 7; break;
2552 case CS8: info->params.data_bits = 8; break;
2553 default: info->params.data_bits = 7; break;
2554 }
2555
2556 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2557
2558 if (cflag & PARENB)
2559 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2560 else
2561 info->params.parity = ASYNC_PARITY_NONE;
2562
2563 /* calculate number of jiffies to transmit a full
2564 * FIFO (32 bytes) at specified data rate
2565 */
2566 bits_per_char = info->params.data_bits +
2567 info->params.stop_bits + 1;
2568
2569 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2570
2571 if (info->params.data_rate) {
2572 info->timeout = (32*HZ*bits_per_char) /
2573 info->params.data_rate;
2574 }
2575 info->timeout += HZ/50; /* Add .02 seconds of slop */
2576
2577 tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
2578 tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
2579
2580 /* process tty input control flags */
2581
2582 info->read_status_mask = IRQ_RXOVER;
2583 if (I_INPCK(info->port.tty))
2584 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2585 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2586 info->read_status_mask |= MASK_BREAK;
2587 if (I_IGNPAR(info->port.tty))
2588 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2589 if (I_IGNBRK(info->port.tty)) {
2590 info->ignore_status_mask |= MASK_BREAK;
2591 /* If ignoring parity and break indicators, ignore
2592 * overruns too. (For real raw support).
2593 */
2594 if (I_IGNPAR(info->port.tty))
2595 info->ignore_status_mask |= MASK_OVERRUN;
2596 }
2597
2598 program_hw(info);
2599 }
2600
2601 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2602 {
2603 DBGINFO(("%s get_stats\n", info->device_name));
2604 if (!user_icount) {
2605 memset(&info->icount, 0, sizeof(info->icount));
2606 } else {
2607 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2608 return -EFAULT;
2609 }
2610 return 0;
2611 }
2612
2613 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2614 {
2615 DBGINFO(("%s get_params\n", info->device_name));
2616 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2617 return -EFAULT;
2618 return 0;
2619 }
2620
2621 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2622 {
2623 unsigned long flags;
2624 MGSL_PARAMS tmp_params;
2625
2626 DBGINFO(("%s set_params\n", info->device_name));
2627 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2628 return -EFAULT;
2629
2630 spin_lock_irqsave(&info->lock, flags);
2631 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
2632 info->base_clock = tmp_params.clock_speed;
2633 else
2634 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2635 spin_unlock_irqrestore(&info->lock, flags);
2636
2637 program_hw(info);
2638
2639 return 0;
2640 }
2641
2642 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2643 {
2644 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2645 if (put_user(info->idle_mode, idle_mode))
2646 return -EFAULT;
2647 return 0;
2648 }
2649
2650 static int set_txidle(struct slgt_info *info, int idle_mode)
2651 {
2652 unsigned long flags;
2653 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2654 spin_lock_irqsave(&info->lock,flags);
2655 info->idle_mode = idle_mode;
2656 if (info->params.mode != MGSL_MODE_ASYNC)
2657 tx_set_idle(info);
2658 spin_unlock_irqrestore(&info->lock,flags);
2659 return 0;
2660 }
2661
2662 static int tx_enable(struct slgt_info *info, int enable)
2663 {
2664 unsigned long flags;
2665 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2666 spin_lock_irqsave(&info->lock,flags);
2667 if (enable) {
2668 if (!info->tx_enabled)
2669 tx_start(info);
2670 } else {
2671 if (info->tx_enabled)
2672 tx_stop(info);
2673 }
2674 spin_unlock_irqrestore(&info->lock,flags);
2675 return 0;
2676 }
2677
2678 /*
2679 * abort transmit HDLC frame
2680 */
2681 static int tx_abort(struct slgt_info *info)
2682 {
2683 unsigned long flags;
2684 DBGINFO(("%s tx_abort\n", info->device_name));
2685 spin_lock_irqsave(&info->lock,flags);
2686 tdma_reset(info);
2687 spin_unlock_irqrestore(&info->lock,flags);
2688 return 0;
2689 }
2690
2691 static int rx_enable(struct slgt_info *info, int enable)
2692 {
2693 unsigned long flags;
2694 unsigned int rbuf_fill_level;
2695 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2696 spin_lock_irqsave(&info->lock,flags);
2697 /*
2698 * enable[31..16] = receive DMA buffer fill level
2699 * 0 = noop (leave fill level unchanged)
2700 * fill level must be multiple of 4 and <= buffer size
2701 */
2702 rbuf_fill_level = ((unsigned int)enable) >> 16;
2703 if (rbuf_fill_level) {
2704 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2705 spin_unlock_irqrestore(&info->lock, flags);
2706 return -EINVAL;
2707 }
2708 info->rbuf_fill_level = rbuf_fill_level;
2709 if (rbuf_fill_level < 128)
2710 info->rx_pio = 1; /* PIO mode */
2711 else
2712 info->rx_pio = 0; /* DMA mode */
2713 rx_stop(info); /* restart receiver to use new fill level */
2714 }
2715
2716 /*
2717 * enable[1..0] = receiver enable command
2718 * 0 = disable
2719 * 1 = enable
2720 * 2 = enable or force hunt mode if already enabled
2721 */
2722 enable &= 3;
2723 if (enable) {
2724 if (!info->rx_enabled)
2725 rx_start(info);
2726 else if (enable == 2) {
2727 /* force hunt mode (write 1 to RCR[3]) */
2728 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2729 }
2730 } else {
2731 if (info->rx_enabled)
2732 rx_stop(info);
2733 }
2734 spin_unlock_irqrestore(&info->lock,flags);
2735 return 0;
2736 }
2737
2738 /*
2739 * wait for specified event to occur
2740 */
2741 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2742 {
2743 unsigned long flags;
2744 int s;
2745 int rc=0;
2746 struct mgsl_icount cprev, cnow;
2747 int events;
2748 int mask;
2749 struct _input_signal_events oldsigs, newsigs;
2750 DECLARE_WAITQUEUE(wait, current);
2751
2752 if (get_user(mask, mask_ptr))
2753 return -EFAULT;
2754
2755 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2756
2757 spin_lock_irqsave(&info->lock,flags);
2758
2759 /* return immediately if state matches requested events */
2760 get_signals(info);
2761 s = info->signals;
2762
2763 events = mask &
2764 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2765 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2766 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2767 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2768 if (events) {
2769 spin_unlock_irqrestore(&info->lock,flags);
2770 goto exit;
2771 }
2772
2773 /* save current irq counts */
2774 cprev = info->icount;
2775 oldsigs = info->input_signal_events;
2776
2777 /* enable hunt and idle irqs if needed */
2778 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2779 unsigned short val = rd_reg16(info, SCR);
2780 if (!(val & IRQ_RXIDLE))
2781 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2782 }
2783
2784 set_current_state(TASK_INTERRUPTIBLE);
2785 add_wait_queue(&info->event_wait_q, &wait);
2786
2787 spin_unlock_irqrestore(&info->lock,flags);
2788
2789 for(;;) {
2790 schedule();
2791 if (signal_pending(current)) {
2792 rc = -ERESTARTSYS;
2793 break;
2794 }
2795
2796 /* get current irq counts */
2797 spin_lock_irqsave(&info->lock,flags);
2798 cnow = info->icount;
2799 newsigs = info->input_signal_events;
2800 set_current_state(TASK_INTERRUPTIBLE);
2801 spin_unlock_irqrestore(&info->lock,flags);
2802
2803 /* if no change, wait aborted for some reason */
2804 if (newsigs.dsr_up == oldsigs.dsr_up &&
2805 newsigs.dsr_down == oldsigs.dsr_down &&
2806 newsigs.dcd_up == oldsigs.dcd_up &&
2807 newsigs.dcd_down == oldsigs.dcd_down &&
2808 newsigs.cts_up == oldsigs.cts_up &&
2809 newsigs.cts_down == oldsigs.cts_down &&
2810 newsigs.ri_up == oldsigs.ri_up &&
2811 newsigs.ri_down == oldsigs.ri_down &&
2812 cnow.exithunt == cprev.exithunt &&
2813 cnow.rxidle == cprev.rxidle) {
2814 rc = -EIO;
2815 break;
2816 }
2817
2818 events = mask &
2819 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2820 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2821 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2822 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2823 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2824 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2825 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2826 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2827 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2828 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2829 if (events)
2830 break;
2831
2832 cprev = cnow;
2833 oldsigs = newsigs;
2834 }
2835
2836 remove_wait_queue(&info->event_wait_q, &wait);
2837 set_current_state(TASK_RUNNING);
2838
2839
2840 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2841 spin_lock_irqsave(&info->lock,flags);
2842 if (!waitqueue_active(&info->event_wait_q)) {
2843 /* disable enable exit hunt mode/idle rcvd IRQs */
2844 wr_reg16(info, SCR,
2845 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2846 }
2847 spin_unlock_irqrestore(&info->lock,flags);
2848 }
2849 exit:
2850 if (rc == 0)
2851 rc = put_user(events, mask_ptr);
2852 return rc;
2853 }
2854
2855 static int get_interface(struct slgt_info *info, int __user *if_mode)
2856 {
2857 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2858 if (put_user(info->if_mode, if_mode))
2859 return -EFAULT;
2860 return 0;
2861 }
2862
2863 static int set_interface(struct slgt_info *info, int if_mode)
2864 {
2865 unsigned long flags;
2866 unsigned short val;
2867
2868 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2869 spin_lock_irqsave(&info->lock,flags);
2870 info->if_mode = if_mode;
2871
2872 msc_set_vcr(info);
2873
2874 /* TCR (tx control) 07 1=RTS driver control */
2875 val = rd_reg16(info, TCR);
2876 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2877 val |= BIT7;
2878 else
2879 val &= ~BIT7;
2880 wr_reg16(info, TCR, val);
2881
2882 spin_unlock_irqrestore(&info->lock,flags);
2883 return 0;
2884 }
2885
2886 static int get_xsync(struct slgt_info *info, int __user *xsync)
2887 {
2888 DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync));
2889 if (put_user(info->xsync, xsync))
2890 return -EFAULT;
2891 return 0;
2892 }
2893
2894 /*
2895 * set extended sync pattern (1 to 4 bytes) for extended sync mode
2896 *
2897 * sync pattern is contained in least significant bytes of value
2898 * most significant byte of sync pattern is oldest (1st sent/detected)
2899 */
2900 static int set_xsync(struct slgt_info *info, int xsync)
2901 {
2902 unsigned long flags;
2903
2904 DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync));
2905 spin_lock_irqsave(&info->lock, flags);
2906 info->xsync = xsync;
2907 wr_reg32(info, XSR, xsync);
2908 spin_unlock_irqrestore(&info->lock, flags);
2909 return 0;
2910 }
2911
2912 static int get_xctrl(struct slgt_info *info, int __user *xctrl)
2913 {
2914 DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl));
2915 if (put_user(info->xctrl, xctrl))
2916 return -EFAULT;
2917 return 0;
2918 }
2919
2920 /*
2921 * set extended control options
2922 *
2923 * xctrl[31:19] reserved, must be zero
2924 * xctrl[18:17] extended sync pattern length in bytes
2925 * 00 = 1 byte in xsr[7:0]
2926 * 01 = 2 bytes in xsr[15:0]
2927 * 10 = 3 bytes in xsr[23:0]
2928 * 11 = 4 bytes in xsr[31:0]
2929 * xctrl[16] 1 = enable terminal count, 0=disabled
2930 * xctrl[15:0] receive terminal count for fixed length packets
2931 * value is count minus one (0 = 1 byte packet)
2932 * when terminal count is reached, receiver
2933 * automatically returns to hunt mode and receive
2934 * FIFO contents are flushed to DMA buffers with
2935 * end of frame (EOF) status
2936 */
2937 static int set_xctrl(struct slgt_info *info, int xctrl)
2938 {
2939 unsigned long flags;
2940
2941 DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl));
2942 spin_lock_irqsave(&info->lock, flags);
2943 info->xctrl = xctrl;
2944 wr_reg32(info, XCR, xctrl);
2945 spin_unlock_irqrestore(&info->lock, flags);
2946 return 0;
2947 }
2948
2949 /*
2950 * set general purpose IO pin state and direction
2951 *
2952 * user_gpio fields:
2953 * state each bit indicates a pin state
2954 * smask set bit indicates pin state to set
2955 * dir each bit indicates a pin direction (0=input, 1=output)
2956 * dmask set bit indicates pin direction to set
2957 */
2958 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2959 {
2960 unsigned long flags;
2961 struct gpio_desc gpio;
2962 __u32 data;
2963
2964 if (!info->gpio_present)
2965 return -EINVAL;
2966 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2967 return -EFAULT;
2968 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2969 info->device_name, gpio.state, gpio.smask,
2970 gpio.dir, gpio.dmask));
2971
2972 spin_lock_irqsave(&info->port_array[0]->lock, flags);
2973 if (gpio.dmask) {
2974 data = rd_reg32(info, IODR);
2975 data |= gpio.dmask & gpio.dir;
2976 data &= ~(gpio.dmask & ~gpio.dir);
2977 wr_reg32(info, IODR, data);
2978 }
2979 if (gpio.smask) {
2980 data = rd_reg32(info, IOVR);
2981 data |= gpio.smask & gpio.state;
2982 data &= ~(gpio.smask & ~gpio.state);
2983 wr_reg32(info, IOVR, data);
2984 }
2985 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
2986
2987 return 0;
2988 }
2989
2990 /*
2991 * get general purpose IO pin state and direction
2992 */
2993 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2994 {
2995 struct gpio_desc gpio;
2996 if (!info->gpio_present)
2997 return -EINVAL;
2998 gpio.state = rd_reg32(info, IOVR);
2999 gpio.smask = 0xffffffff;
3000 gpio.dir = rd_reg32(info, IODR);
3001 gpio.dmask = 0xffffffff;
3002 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3003 return -EFAULT;
3004 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
3005 info->device_name, gpio.state, gpio.dir));
3006 return 0;
3007 }
3008
3009 /*
3010 * conditional wait facility
3011 */
3012 static void init_cond_wait(struct cond_wait *w, unsigned int data)
3013 {
3014 init_waitqueue_head(&w->q);
3015 init_waitqueue_entry(&w->wait, current);
3016 w->data = data;
3017 }
3018
3019 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
3020 {
3021 set_current_state(TASK_INTERRUPTIBLE);
3022 add_wait_queue(&w->q, &w->wait);
3023 w->next = *head;
3024 *head = w;
3025 }
3026
3027 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
3028 {
3029 struct cond_wait *w, *prev;
3030 remove_wait_queue(&cw->q, &cw->wait);
3031 set_current_state(TASK_RUNNING);
3032 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
3033 if (w == cw) {
3034 if (prev != NULL)
3035 prev->next = w->next;
3036 else
3037 *head = w->next;
3038 break;
3039 }
3040 }
3041 }
3042
3043 static void flush_cond_wait(struct cond_wait **head)
3044 {
3045 while (*head != NULL) {
3046 wake_up_interruptible(&(*head)->q);
3047 *head = (*head)->next;
3048 }
3049 }
3050
3051 /*
3052 * wait for general purpose I/O pin(s) to enter specified state
3053 *
3054 * user_gpio fields:
3055 * state - bit indicates target pin state
3056 * smask - set bit indicates watched pin
3057 *
3058 * The wait ends when at least one watched pin enters the specified
3059 * state. When 0 (no error) is returned, user_gpio->state is set to the
3060 * state of all GPIO pins when the wait ends.
3061 *
3062 * Note: Each pin may be a dedicated input, dedicated output, or
3063 * configurable input/output. The number and configuration of pins
3064 * varies with the specific adapter model. Only input pins (dedicated
3065 * or configured) can be monitored with this function.
3066 */
3067 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3068 {
3069 unsigned long flags;
3070 int rc = 0;
3071 struct gpio_desc gpio;
3072 struct cond_wait wait;
3073 u32 state;
3074
3075 if (!info->gpio_present)
3076 return -EINVAL;
3077 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
3078 return -EFAULT;
3079 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
3080 info->device_name, gpio.state, gpio.smask));
3081 /* ignore output pins identified by set IODR bit */
3082 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
3083 return -EINVAL;
3084 init_cond_wait(&wait, gpio.smask);
3085
3086 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3087 /* enable interrupts for watched pins */
3088 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
3089 /* get current pin states */
3090 state = rd_reg32(info, IOVR);
3091
3092 if (gpio.smask & ~(state ^ gpio.state)) {
3093 /* already in target state */
3094 gpio.state = state;
3095 } else {
3096 /* wait for target state */
3097 add_cond_wait(&info->gpio_wait_q, &wait);
3098 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3099 schedule();
3100 if (signal_pending(current))
3101 rc = -ERESTARTSYS;
3102 else
3103 gpio.state = wait.data;
3104 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3105 remove_cond_wait(&info->gpio_wait_q, &wait);
3106 }
3107
3108 /* disable all GPIO interrupts if no waiting processes */
3109 if (info->gpio_wait_q == NULL)
3110 wr_reg32(info, IOER, 0);
3111 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3112
3113 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3114 rc = -EFAULT;
3115 return rc;
3116 }
3117
3118 static int modem_input_wait(struct slgt_info *info,int arg)
3119 {
3120 unsigned long flags;
3121 int rc;
3122 struct mgsl_icount cprev, cnow;
3123 DECLARE_WAITQUEUE(wait, current);
3124
3125 /* save current irq counts */
3126 spin_lock_irqsave(&info->lock,flags);
3127 cprev = info->icount;
3128 add_wait_queue(&info->status_event_wait_q, &wait);
3129 set_current_state(TASK_INTERRUPTIBLE);
3130 spin_unlock_irqrestore(&info->lock,flags);
3131
3132 for(;;) {
3133 schedule();
3134 if (signal_pending(current)) {
3135 rc = -ERESTARTSYS;
3136 break;
3137 }
3138
3139 /* get new irq counts */
3140 spin_lock_irqsave(&info->lock,flags);
3141 cnow = info->icount;
3142 set_current_state(TASK_INTERRUPTIBLE);
3143 spin_unlock_irqrestore(&info->lock,flags);
3144
3145 /* if no change, wait aborted for some reason */
3146 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3147 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3148 rc = -EIO;
3149 break;
3150 }
3151
3152 /* check for change in caller specified modem input */
3153 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3154 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3155 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3156 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3157 rc = 0;
3158 break;
3159 }
3160
3161 cprev = cnow;
3162 }
3163 remove_wait_queue(&info->status_event_wait_q, &wait);
3164 set_current_state(TASK_RUNNING);
3165 return rc;
3166 }
3167
3168 /*
3169 * return state of serial control and status signals
3170 */
3171 static int tiocmget(struct tty_struct *tty)
3172 {
3173 struct slgt_info *info = tty->driver_data;
3174 unsigned int result;
3175 unsigned long flags;
3176
3177 spin_lock_irqsave(&info->lock,flags);
3178 get_signals(info);
3179 spin_unlock_irqrestore(&info->lock,flags);
3180
3181 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3182 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3183 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3184 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3185 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3186 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3187
3188 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3189 return result;
3190 }
3191
3192 /*
3193 * set modem control signals (DTR/RTS)
3194 *
3195 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3196 * TIOCMSET = set/clear signal values
3197 * value bit mask for command
3198 */
3199 static int tiocmset(struct tty_struct *tty,
3200 unsigned int set, unsigned int clear)
3201 {
3202 struct slgt_info *info = tty->driver_data;
3203 unsigned long flags;
3204
3205 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3206
3207 if (set & TIOCM_RTS)
3208 info->signals |= SerialSignal_RTS;
3209 if (set & TIOCM_DTR)
3210 info->signals |= SerialSignal_DTR;
3211 if (clear & TIOCM_RTS)
3212 info->signals &= ~SerialSignal_RTS;
3213 if (clear & TIOCM_DTR)
3214 info->signals &= ~SerialSignal_DTR;
3215
3216 spin_lock_irqsave(&info->lock,flags);
3217 set_signals(info);
3218 spin_unlock_irqrestore(&info->lock,flags);
3219 return 0;
3220 }
3221
3222 static int carrier_raised(struct tty_port *port)
3223 {
3224 unsigned long flags;
3225 struct slgt_info *info = container_of(port, struct slgt_info, port);
3226
3227 spin_lock_irqsave(&info->lock,flags);
3228 get_signals(info);
3229 spin_unlock_irqrestore(&info->lock,flags);
3230 return (info->signals & SerialSignal_DCD) ? 1 : 0;
3231 }
3232
3233 static void dtr_rts(struct tty_port *port, int on)
3234 {
3235 unsigned long flags;
3236 struct slgt_info *info = container_of(port, struct slgt_info, port);
3237
3238 spin_lock_irqsave(&info->lock,flags);
3239 if (on)
3240 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
3241 else
3242 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3243 set_signals(info);
3244 spin_unlock_irqrestore(&info->lock,flags);
3245 }
3246
3247
3248 /*
3249 * block current process until the device is ready to open
3250 */
3251 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3252 struct slgt_info *info)
3253 {
3254 DECLARE_WAITQUEUE(wait, current);
3255 int retval;
3256 bool do_clocal = false;
3257 unsigned long flags;
3258 int cd;
3259 struct tty_port *port = &info->port;
3260
3261 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3262
3263 if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) {
3264 /* nonblock mode is set or port is not enabled */
3265 tty_port_set_active(port, 1);
3266 return 0;
3267 }
3268
3269 if (C_CLOCAL(tty))
3270 do_clocal = true;
3271
3272 /* Wait for carrier detect and the line to become
3273 * free (i.e., not in use by the callout). While we are in
3274 * this loop, port->count is dropped by one, so that
3275 * close() knows when to free things. We restore it upon
3276 * exit, either normal or abnormal.
3277 */
3278
3279 retval = 0;
3280 add_wait_queue(&port->open_wait, &wait);
3281
3282 spin_lock_irqsave(&info->lock, flags);
3283 port->count--;
3284 spin_unlock_irqrestore(&info->lock, flags);
3285 port->blocked_open++;
3286
3287 while (1) {
3288 if (C_BAUD(tty) && tty_port_initialized(port))
3289 tty_port_raise_dtr_rts(port);
3290
3291 set_current_state(TASK_INTERRUPTIBLE);
3292
3293 if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
3294 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3295 -EAGAIN : -ERESTARTSYS;
3296 break;
3297 }
3298
3299 cd = tty_port_carrier_raised(port);
3300 if (do_clocal || cd)
3301 break;
3302
3303 if (signal_pending(current)) {
3304 retval = -ERESTARTSYS;
3305 break;
3306 }
3307
3308 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3309 tty_unlock(tty);
3310 schedule();
3311 tty_lock(tty);
3312 }
3313
3314 set_current_state(TASK_RUNNING);
3315 remove_wait_queue(&port->open_wait, &wait);
3316
3317 if (!tty_hung_up_p(filp))
3318 port->count++;
3319 port->blocked_open--;
3320
3321 if (!retval)
3322 tty_port_set_active(port, 1);
3323
3324 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3325 return retval;
3326 }
3327
3328 /*
3329 * allocate buffers used for calling line discipline receive_buf
3330 * directly in synchronous mode
3331 * note: add 5 bytes to max frame size to allow appending
3332 * 32-bit CRC and status byte when configured to do so
3333 */
3334 static int alloc_tmp_rbuf(struct slgt_info *info)
3335 {
3336 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3337 if (info->tmp_rbuf == NULL)
3338 return -ENOMEM;
3339 /* unused flag buffer to satisfy receive_buf calling interface */
3340 info->flag_buf = kzalloc(info->max_frame_size + 5, GFP_KERNEL);
3341 if (!info->flag_buf) {
3342 kfree(info->tmp_rbuf);
3343 info->tmp_rbuf = NULL;
3344 return -ENOMEM;
3345 }
3346 return 0;
3347 }
3348
3349 static void free_tmp_rbuf(struct slgt_info *info)
3350 {
3351 kfree(info->tmp_rbuf);
3352 info->tmp_rbuf = NULL;
3353 kfree(info->flag_buf);
3354 info->flag_buf = NULL;
3355 }
3356
3357 /*
3358 * allocate DMA descriptor lists.
3359 */
3360 static int alloc_desc(struct slgt_info *info)
3361 {
3362 unsigned int i;
3363 unsigned int pbufs;
3364
3365 /* allocate memory to hold descriptor lists */
3366 info->bufs = pci_zalloc_consistent(info->pdev, DESC_LIST_SIZE,
3367 &info->bufs_dma_addr);
3368 if (info->bufs == NULL)
3369 return -ENOMEM;
3370
3371 info->rbufs = (struct slgt_desc*)info->bufs;
3372 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3373
3374 pbufs = (unsigned int)info->bufs_dma_addr;
3375
3376 /*
3377 * Build circular lists of descriptors
3378 */
3379
3380 for (i=0; i < info->rbuf_count; i++) {
3381 /* physical address of this descriptor */
3382 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3383
3384 /* physical address of next descriptor */
3385 if (i == info->rbuf_count - 1)
3386 info->rbufs[i].next = cpu_to_le32(pbufs);
3387 else
3388 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3389 set_desc_count(info->rbufs[i], DMABUFSIZE);
3390 }
3391
3392 for (i=0; i < info->tbuf_count; i++) {
3393 /* physical address of this descriptor */
3394 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3395
3396 /* physical address of next descriptor */
3397 if (i == info->tbuf_count - 1)
3398 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3399 else
3400 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3401 }
3402
3403 return 0;
3404 }
3405
3406 static void free_desc(struct slgt_info *info)
3407 {
3408 if (info->bufs != NULL) {
3409 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3410 info->bufs = NULL;
3411 info->rbufs = NULL;
3412 info->tbufs = NULL;
3413 }
3414 }
3415
3416 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3417 {
3418 int i;
3419 for (i=0; i < count; i++) {
3420 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3421 return -ENOMEM;
3422 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3423 }
3424 return 0;
3425 }
3426
3427 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3428 {
3429 int i;
3430 for (i=0; i < count; i++) {
3431 if (bufs[i].buf == NULL)
3432 continue;
3433 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3434 bufs[i].buf = NULL;
3435 }
3436 }
3437
3438 static int alloc_dma_bufs(struct slgt_info *info)
3439 {
3440 info->rbuf_count = 32;
3441 info->tbuf_count = 32;
3442
3443 if (alloc_desc(info) < 0 ||
3444 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3445 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3446 alloc_tmp_rbuf(info) < 0) {
3447 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3448 return -ENOMEM;
3449 }
3450 reset_rbufs(info);
3451 return 0;
3452 }
3453
3454 static void free_dma_bufs(struct slgt_info *info)
3455 {
3456 if (info->bufs) {
3457 free_bufs(info, info->rbufs, info->rbuf_count);
3458 free_bufs(info, info->tbufs, info->tbuf_count);
3459 free_desc(info);
3460 }
3461 free_tmp_rbuf(info);
3462 }
3463
3464 static int claim_resources(struct slgt_info *info)
3465 {
3466 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3467 DBGERR(("%s reg addr conflict, addr=%08X\n",
3468 info->device_name, info->phys_reg_addr));
3469 info->init_error = DiagStatus_AddressConflict;
3470 goto errout;
3471 }
3472 else
3473 info->reg_addr_requested = true;
3474
3475 info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3476 if (!info->reg_addr) {
3477 DBGERR(("%s can't map device registers, addr=%08X\n",
3478 info->device_name, info->phys_reg_addr));
3479 info->init_error = DiagStatus_CantAssignPciResources;
3480 goto errout;
3481 }
3482 return 0;
3483
3484 errout:
3485 release_resources(info);
3486 return -ENODEV;
3487 }
3488
3489 static void release_resources(struct slgt_info *info)
3490 {
3491 if (info->irq_requested) {
3492 free_irq(info->irq_level, info);
3493 info->irq_requested = false;
3494 }
3495
3496 if (info->reg_addr_requested) {
3497 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3498 info->reg_addr_requested = false;
3499 }
3500
3501 if (info->reg_addr) {
3502 iounmap(info->reg_addr);
3503 info->reg_addr = NULL;
3504 }
3505 }
3506
3507 /* Add the specified device instance data structure to the
3508 * global linked list of devices and increment the device count.
3509 */
3510 static void add_device(struct slgt_info *info)
3511 {
3512 char *devstr;
3513
3514 info->next_device = NULL;
3515 info->line = slgt_device_count;
3516 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3517
3518 if (info->line < MAX_DEVICES) {
3519 if (maxframe[info->line])
3520 info->max_frame_size = maxframe[info->line];
3521 }
3522
3523 slgt_device_count++;
3524
3525 if (!slgt_device_list)
3526 slgt_device_list = info;
3527 else {
3528 struct slgt_info *current_dev = slgt_device_list;
3529 while(current_dev->next_device)
3530 current_dev = current_dev->next_device;
3531 current_dev->next_device = info;
3532 }
3533
3534 if (info->max_frame_size < 4096)
3535 info->max_frame_size = 4096;
3536 else if (info->max_frame_size > 65535)
3537 info->max_frame_size = 65535;
3538
3539 switch(info->pdev->device) {
3540 case SYNCLINK_GT_DEVICE_ID:
3541 devstr = "GT";
3542 break;
3543 case SYNCLINK_GT2_DEVICE_ID:
3544 devstr = "GT2";
3545 break;
3546 case SYNCLINK_GT4_DEVICE_ID:
3547 devstr = "GT4";
3548 break;
3549 case SYNCLINK_AC_DEVICE_ID:
3550 devstr = "AC";
3551 info->params.mode = MGSL_MODE_ASYNC;
3552 break;
3553 default:
3554 devstr = "(unknown model)";
3555 }
3556 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3557 devstr, info->device_name, info->phys_reg_addr,
3558 info->irq_level, info->max_frame_size);
3559
3560 #if SYNCLINK_GENERIC_HDLC
3561 hdlcdev_init(info);
3562 #endif
3563 }
3564
3565 static const struct tty_port_operations slgt_port_ops = {
3566 .carrier_raised = carrier_raised,
3567 .dtr_rts = dtr_rts,
3568 };
3569
3570 /*
3571 * allocate device instance structure, return NULL on failure
3572 */
3573 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3574 {
3575 struct slgt_info *info;
3576
3577 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3578
3579 if (!info) {
3580 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3581 driver_name, adapter_num, port_num));
3582 } else {
3583 tty_port_init(&info->port);
3584 info->port.ops = &slgt_port_ops;
3585 info->magic = MGSL_MAGIC;
3586 INIT_WORK(&info->task, bh_handler);
3587 info->max_frame_size = 4096;
3588 info->base_clock = 14745600;
3589 info->rbuf_fill_level = DMABUFSIZE;
3590 info->port.close_delay = 5*HZ/10;
3591 info->port.closing_wait = 30*HZ;
3592 init_waitqueue_head(&info->status_event_wait_q);
3593 init_waitqueue_head(&info->event_wait_q);
3594 spin_lock_init(&info->netlock);
3595 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3596 info->idle_mode = HDLC_TXIDLE_FLAGS;
3597 info->adapter_num = adapter_num;
3598 info->port_num = port_num;
3599
3600 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3601 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3602
3603 /* Copy configuration info to device instance data */
3604 info->pdev = pdev;
3605 info->irq_level = pdev->irq;
3606 info->phys_reg_addr = pci_resource_start(pdev,0);
3607
3608 info->bus_type = MGSL_BUS_TYPE_PCI;
3609 info->irq_flags = IRQF_SHARED;
3610
3611 info->init_error = -1; /* assume error, set to 0 on successful init */
3612 }
3613
3614 return info;
3615 }
3616
3617 static void device_init(int adapter_num, struct pci_dev *pdev)
3618 {
3619 struct slgt_info *port_array[SLGT_MAX_PORTS];
3620 int i;
3621 int port_count = 1;
3622
3623 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3624 port_count = 2;
3625 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3626 port_count = 4;
3627
3628 /* allocate device instances for all ports */
3629 for (i=0; i < port_count; ++i) {
3630 port_array[i] = alloc_dev(adapter_num, i, pdev);
3631 if (port_array[i] == NULL) {
3632 for (--i; i >= 0; --i) {
3633 tty_port_destroy(&port_array[i]->port);
3634 kfree(port_array[i]);
3635 }
3636 return;
3637 }
3638 }
3639
3640 /* give copy of port_array to all ports and add to device list */
3641 for (i=0; i < port_count; ++i) {
3642 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3643 add_device(port_array[i]);
3644 port_array[i]->port_count = port_count;
3645 spin_lock_init(&port_array[i]->lock);
3646 }
3647
3648 /* Allocate and claim adapter resources */
3649 if (!claim_resources(port_array[0])) {
3650
3651 alloc_dma_bufs(port_array[0]);
3652
3653 /* copy resource information from first port to others */
3654 for (i = 1; i < port_count; ++i) {
3655 port_array[i]->irq_level = port_array[0]->irq_level;
3656 port_array[i]->reg_addr = port_array[0]->reg_addr;
3657 alloc_dma_bufs(port_array[i]);
3658 }
3659
3660 if (request_irq(port_array[0]->irq_level,
3661 slgt_interrupt,
3662 port_array[0]->irq_flags,
3663 port_array[0]->device_name,
3664 port_array[0]) < 0) {
3665 DBGERR(("%s request_irq failed IRQ=%d\n",
3666 port_array[0]->device_name,
3667 port_array[0]->irq_level));
3668 } else {
3669 port_array[0]->irq_requested = true;
3670 adapter_test(port_array[0]);
3671 for (i=1 ; i < port_count ; i++) {
3672 port_array[i]->init_error = port_array[0]->init_error;
3673 port_array[i]->gpio_present = port_array[0]->gpio_present;
3674 }
3675 }
3676 }
3677
3678 for (i = 0; i < port_count; ++i) {
3679 struct slgt_info *info = port_array[i];
3680 tty_port_register_device(&info->port, serial_driver, info->line,
3681 &info->pdev->dev);
3682 }
3683 }
3684
3685 static int init_one(struct pci_dev *dev,
3686 const struct pci_device_id *ent)
3687 {
3688 if (pci_enable_device(dev)) {
3689 printk("error enabling pci device %p\n", dev);
3690 return -EIO;
3691 }
3692 pci_set_master(dev);
3693 device_init(slgt_device_count, dev);
3694 return 0;
3695 }
3696
3697 static void remove_one(struct pci_dev *dev)
3698 {
3699 }
3700
3701 static const struct tty_operations ops = {
3702 .open = open,
3703 .close = close,
3704 .write = write,
3705 .put_char = put_char,
3706 .flush_chars = flush_chars,
3707 .write_room = write_room,
3708 .chars_in_buffer = chars_in_buffer,
3709 .flush_buffer = flush_buffer,
3710 .ioctl = ioctl,
3711 .compat_ioctl = slgt_compat_ioctl,
3712 .throttle = throttle,
3713 .unthrottle = unthrottle,
3714 .send_xchar = send_xchar,
3715 .break_ctl = set_break,
3716 .wait_until_sent = wait_until_sent,
3717 .set_termios = set_termios,
3718 .stop = tx_hold,
3719 .start = tx_release,
3720 .hangup = hangup,
3721 .tiocmget = tiocmget,
3722 .tiocmset = tiocmset,
3723 .get_icount = get_icount,
3724 .proc_fops = &synclink_gt_proc_fops,
3725 };
3726
3727 static void slgt_cleanup(void)
3728 {
3729 int rc;
3730 struct slgt_info *info;
3731 struct slgt_info *tmp;
3732
3733 printk(KERN_INFO "unload %s\n", driver_name);
3734
3735 if (serial_driver) {
3736 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3737 tty_unregister_device(serial_driver, info->line);
3738 rc = tty_unregister_driver(serial_driver);
3739 if (rc)
3740 DBGERR(("tty_unregister_driver error=%d\n", rc));
3741 put_tty_driver(serial_driver);
3742 }
3743
3744 /* reset devices */
3745 info = slgt_device_list;
3746 while(info) {
3747 reset_port(info);
3748 info = info->next_device;
3749 }
3750
3751 /* release devices */
3752 info = slgt_device_list;
3753 while(info) {
3754 #if SYNCLINK_GENERIC_HDLC
3755 hdlcdev_exit(info);
3756 #endif
3757 free_dma_bufs(info);
3758 free_tmp_rbuf(info);
3759 if (info->port_num == 0)
3760 release_resources(info);
3761 tmp = info;
3762 info = info->next_device;
3763 tty_port_destroy(&tmp->port);
3764 kfree(tmp);
3765 }
3766
3767 if (pci_registered)
3768 pci_unregister_driver(&pci_driver);
3769 }
3770
3771 /*
3772 * Driver initialization entry point.
3773 */
3774 static int __init slgt_init(void)
3775 {
3776 int rc;
3777
3778 printk(KERN_INFO "%s\n", driver_name);
3779
3780 serial_driver = alloc_tty_driver(MAX_DEVICES);
3781 if (!serial_driver) {
3782 printk("%s can't allocate tty driver\n", driver_name);
3783 return -ENOMEM;
3784 }
3785
3786 /* Initialize the tty_driver structure */
3787
3788 serial_driver->driver_name = slgt_driver_name;
3789 serial_driver->name = tty_dev_prefix;
3790 serial_driver->major = ttymajor;
3791 serial_driver->minor_start = 64;
3792 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3793 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3794 serial_driver->init_termios = tty_std_termios;
3795 serial_driver->init_termios.c_cflag =
3796 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3797 serial_driver->init_termios.c_ispeed = 9600;
3798 serial_driver->init_termios.c_ospeed = 9600;
3799 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3800 tty_set_operations(serial_driver, &ops);
3801 if ((rc = tty_register_driver(serial_driver)) < 0) {
3802 DBGERR(("%s can't register serial driver\n", driver_name));
3803 put_tty_driver(serial_driver);
3804 serial_driver = NULL;
3805 goto error;
3806 }
3807
3808 printk(KERN_INFO "%s, tty major#%d\n",
3809 driver_name, serial_driver->major);
3810
3811 slgt_device_count = 0;
3812 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3813 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3814 goto error;
3815 }
3816 pci_registered = true;
3817
3818 if (!slgt_device_list)
3819 printk("%s no devices found\n",driver_name);
3820
3821 return 0;
3822
3823 error:
3824 slgt_cleanup();
3825 return rc;
3826 }
3827
3828 static void __exit slgt_exit(void)
3829 {
3830 slgt_cleanup();
3831 }
3832
3833 module_init(slgt_init);
3834 module_exit(slgt_exit);
3835
3836 /*
3837 * register access routines
3838 */
3839
3840 #define CALC_REGADDR() \
3841 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3842 if (addr >= 0x80) \
3843 reg_addr += (info->port_num) * 32; \
3844 else if (addr >= 0x40) \
3845 reg_addr += (info->port_num) * 16;
3846
3847 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3848 {
3849 CALC_REGADDR();
3850 return readb((void __iomem *)reg_addr);
3851 }
3852
3853 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3854 {
3855 CALC_REGADDR();
3856 writeb(value, (void __iomem *)reg_addr);
3857 }
3858
3859 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3860 {
3861 CALC_REGADDR();
3862 return readw((void __iomem *)reg_addr);
3863 }
3864
3865 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3866 {
3867 CALC_REGADDR();
3868 writew(value, (void __iomem *)reg_addr);
3869 }
3870
3871 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3872 {
3873 CALC_REGADDR();
3874 return readl((void __iomem *)reg_addr);
3875 }
3876
3877 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3878 {
3879 CALC_REGADDR();
3880 writel(value, (void __iomem *)reg_addr);
3881 }
3882
3883 static void rdma_reset(struct slgt_info *info)
3884 {
3885 unsigned int i;
3886
3887 /* set reset bit */
3888 wr_reg32(info, RDCSR, BIT1);
3889
3890 /* wait for enable bit cleared */
3891 for(i=0 ; i < 1000 ; i++)
3892 if (!(rd_reg32(info, RDCSR) & BIT0))
3893 break;
3894 }
3895
3896 static void tdma_reset(struct slgt_info *info)
3897 {
3898 unsigned int i;
3899
3900 /* set reset bit */
3901 wr_reg32(info, TDCSR, BIT1);
3902
3903 /* wait for enable bit cleared */
3904 for(i=0 ; i < 1000 ; i++)
3905 if (!(rd_reg32(info, TDCSR) & BIT0))
3906 break;
3907 }
3908
3909 /*
3910 * enable internal loopback
3911 * TxCLK and RxCLK are generated from BRG
3912 * and TxD is looped back to RxD internally.
3913 */
3914 static void enable_loopback(struct slgt_info *info)
3915 {
3916 /* SCR (serial control) BIT2=loopback enable */
3917 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3918
3919 if (info->params.mode != MGSL_MODE_ASYNC) {
3920 /* CCR (clock control)
3921 * 07..05 tx clock source (010 = BRG)
3922 * 04..02 rx clock source (010 = BRG)
3923 * 01 auxclk enable (0 = disable)
3924 * 00 BRG enable (1 = enable)
3925 *
3926 * 0100 1001
3927 */
3928 wr_reg8(info, CCR, 0x49);
3929
3930 /* set speed if available, otherwise use default */
3931 if (info->params.clock_speed)
3932 set_rate(info, info->params.clock_speed);
3933 else
3934 set_rate(info, 3686400);
3935 }
3936 }
3937
3938 /*
3939 * set baud rate generator to specified rate
3940 */
3941 static void set_rate(struct slgt_info *info, u32 rate)
3942 {
3943 unsigned int div;
3944 unsigned int osc = info->base_clock;
3945
3946 /* div = osc/rate - 1
3947 *
3948 * Round div up if osc/rate is not integer to
3949 * force to next slowest rate.
3950 */
3951
3952 if (rate) {
3953 div = osc/rate;
3954 if (!(osc % rate) && div)
3955 div--;
3956 wr_reg16(info, BDR, (unsigned short)div);
3957 }
3958 }
3959
3960 static void rx_stop(struct slgt_info *info)
3961 {
3962 unsigned short val;
3963
3964 /* disable and reset receiver */
3965 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3966 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3967 wr_reg16(info, RCR, val); /* clear reset bit */
3968
3969 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3970
3971 /* clear pending rx interrupts */
3972 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3973
3974 rdma_reset(info);
3975
3976 info->rx_enabled = false;
3977 info->rx_restart = false;
3978 }
3979
3980 static void rx_start(struct slgt_info *info)
3981 {
3982 unsigned short val;
3983
3984 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3985
3986 /* clear pending rx overrun IRQ */
3987 wr_reg16(info, SSR, IRQ_RXOVER);
3988
3989 /* reset and disable receiver */
3990 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3991 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3992 wr_reg16(info, RCR, val); /* clear reset bit */
3993
3994 rdma_reset(info);
3995 reset_rbufs(info);
3996
3997 if (info->rx_pio) {
3998 /* rx request when rx FIFO not empty */
3999 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14));
4000 slgt_irq_on(info, IRQ_RXDATA);
4001 if (info->params.mode == MGSL_MODE_ASYNC) {
4002 /* enable saving of rx status */
4003 wr_reg32(info, RDCSR, BIT6);
4004 }
4005 } else {
4006 /* rx request when rx FIFO half full */
4007 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14));
4008 /* set 1st descriptor address */
4009 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
4010
4011 if (info->params.mode != MGSL_MODE_ASYNC) {
4012 /* enable rx DMA and DMA interrupt */
4013 wr_reg32(info, RDCSR, (BIT2 + BIT0));
4014 } else {
4015 /* enable saving of rx status, rx DMA and DMA interrupt */
4016 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
4017 }
4018 }
4019
4020 slgt_irq_on(info, IRQ_RXOVER);
4021
4022 /* enable receiver */
4023 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
4024
4025 info->rx_restart = false;
4026 info->rx_enabled = true;
4027 }
4028
4029 static void tx_start(struct slgt_info *info)
4030 {
4031 if (!info->tx_enabled) {
4032 wr_reg16(info, TCR,
4033 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
4034 info->tx_enabled = true;
4035 }
4036
4037 if (desc_count(info->tbufs[info->tbuf_start])) {
4038 info->drop_rts_on_tx_done = false;
4039
4040 if (info->params.mode != MGSL_MODE_ASYNC) {
4041 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
4042 get_signals(info);
4043 if (!(info->signals & SerialSignal_RTS)) {
4044 info->signals |= SerialSignal_RTS;
4045 set_signals(info);
4046 info->drop_rts_on_tx_done = true;
4047 }
4048 }
4049
4050 slgt_irq_off(info, IRQ_TXDATA);
4051 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
4052 /* clear tx idle and underrun status bits */
4053 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4054 } else {
4055 slgt_irq_off(info, IRQ_TXDATA);
4056 slgt_irq_on(info, IRQ_TXIDLE);
4057 /* clear tx idle status bit */
4058 wr_reg16(info, SSR, IRQ_TXIDLE);
4059 }
4060 /* set 1st descriptor address and start DMA */
4061 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
4062 wr_reg32(info, TDCSR, BIT2 + BIT0);
4063 info->tx_active = true;
4064 }
4065 }
4066
4067 static void tx_stop(struct slgt_info *info)
4068 {
4069 unsigned short val;
4070
4071 del_timer(&info->tx_timer);
4072
4073 tdma_reset(info);
4074
4075 /* reset and disable transmitter */
4076 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
4077 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
4078
4079 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
4080
4081 /* clear tx idle and underrun status bit */
4082 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4083
4084 reset_tbufs(info);
4085
4086 info->tx_enabled = false;
4087 info->tx_active = false;
4088 }
4089
4090 static void reset_port(struct slgt_info *info)
4091 {
4092 if (!info->reg_addr)
4093 return;
4094
4095 tx_stop(info);
4096 rx_stop(info);
4097
4098 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
4099 set_signals(info);
4100
4101 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4102 }
4103
4104 static void reset_adapter(struct slgt_info *info)
4105 {
4106 int i;
4107 for (i=0; i < info->port_count; ++i) {
4108 if (info->port_array[i])
4109 reset_port(info->port_array[i]);
4110 }
4111 }
4112
4113 static void async_mode(struct slgt_info *info)
4114 {
4115 unsigned short val;
4116
4117 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4118 tx_stop(info);
4119 rx_stop(info);
4120
4121 /* TCR (tx control)
4122 *
4123 * 15..13 mode, 010=async
4124 * 12..10 encoding, 000=NRZ
4125 * 09 parity enable
4126 * 08 1=odd parity, 0=even parity
4127 * 07 1=RTS driver control
4128 * 06 1=break enable
4129 * 05..04 character length
4130 * 00=5 bits
4131 * 01=6 bits
4132 * 10=7 bits
4133 * 11=8 bits
4134 * 03 0=1 stop bit, 1=2 stop bits
4135 * 02 reset
4136 * 01 enable
4137 * 00 auto-CTS enable
4138 */
4139 val = 0x4000;
4140
4141 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4142 val |= BIT7;
4143
4144 if (info->params.parity != ASYNC_PARITY_NONE) {
4145 val |= BIT9;
4146 if (info->params.parity == ASYNC_PARITY_ODD)
4147 val |= BIT8;
4148 }
4149
4150 switch (info->params.data_bits)
4151 {
4152 case 6: val |= BIT4; break;
4153 case 7: val |= BIT5; break;
4154 case 8: val |= BIT5 + BIT4; break;
4155 }
4156
4157 if (info->params.stop_bits != 1)
4158 val |= BIT3;
4159
4160 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4161 val |= BIT0;
4162
4163 wr_reg16(info, TCR, val);
4164
4165 /* RCR (rx control)
4166 *
4167 * 15..13 mode, 010=async
4168 * 12..10 encoding, 000=NRZ
4169 * 09 parity enable
4170 * 08 1=odd parity, 0=even parity
4171 * 07..06 reserved, must be 0
4172 * 05..04 character length
4173 * 00=5 bits
4174 * 01=6 bits
4175 * 10=7 bits
4176 * 11=8 bits
4177 * 03 reserved, must be zero
4178 * 02 reset
4179 * 01 enable
4180 * 00 auto-DCD enable
4181 */
4182 val = 0x4000;
4183
4184 if (info->params.parity != ASYNC_PARITY_NONE) {
4185 val |= BIT9;
4186 if (info->params.parity == ASYNC_PARITY_ODD)
4187 val |= BIT8;
4188 }
4189
4190 switch (info->params.data_bits)
4191 {
4192 case 6: val |= BIT4; break;
4193 case 7: val |= BIT5; break;
4194 case 8: val |= BIT5 + BIT4; break;
4195 }
4196
4197 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4198 val |= BIT0;
4199
4200 wr_reg16(info, RCR, val);
4201
4202 /* CCR (clock control)
4203 *
4204 * 07..05 011 = tx clock source is BRG/16
4205 * 04..02 010 = rx clock source is BRG
4206 * 01 0 = auxclk disabled
4207 * 00 1 = BRG enabled
4208 *
4209 * 0110 1001
4210 */
4211 wr_reg8(info, CCR, 0x69);
4212
4213 msc_set_vcr(info);
4214
4215 /* SCR (serial control)
4216 *
4217 * 15 1=tx req on FIFO half empty
4218 * 14 1=rx req on FIFO half full
4219 * 13 tx data IRQ enable
4220 * 12 tx idle IRQ enable
4221 * 11 rx break on IRQ enable
4222 * 10 rx data IRQ enable
4223 * 09 rx break off IRQ enable
4224 * 08 overrun IRQ enable
4225 * 07 DSR IRQ enable
4226 * 06 CTS IRQ enable
4227 * 05 DCD IRQ enable
4228 * 04 RI IRQ enable
4229 * 03 0=16x sampling, 1=8x sampling
4230 * 02 1=txd->rxd internal loopback enable
4231 * 01 reserved, must be zero
4232 * 00 1=master IRQ enable
4233 */
4234 val = BIT15 + BIT14 + BIT0;
4235 /* JCR[8] : 1 = x8 async mode feature available */
4236 if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate &&
4237 ((info->base_clock < (info->params.data_rate * 16)) ||
4238 (info->base_clock % (info->params.data_rate * 16)))) {
4239 /* use 8x sampling */
4240 val |= BIT3;
4241 set_rate(info, info->params.data_rate * 8);
4242 } else {
4243 /* use 16x sampling */
4244 set_rate(info, info->params.data_rate * 16);
4245 }
4246 wr_reg16(info, SCR, val);
4247
4248 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4249
4250 if (info->params.loopback)
4251 enable_loopback(info);
4252 }
4253
4254 static void sync_mode(struct slgt_info *info)
4255 {
4256 unsigned short val;
4257
4258 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4259 tx_stop(info);
4260 rx_stop(info);
4261
4262 /* TCR (tx control)
4263 *
4264 * 15..13 mode
4265 * 000=HDLC/SDLC
4266 * 001=raw bit synchronous
4267 * 010=asynchronous/isochronous
4268 * 011=monosync byte synchronous
4269 * 100=bisync byte synchronous
4270 * 101=xsync byte synchronous
4271 * 12..10 encoding
4272 * 09 CRC enable
4273 * 08 CRC32
4274 * 07 1=RTS driver control
4275 * 06 preamble enable
4276 * 05..04 preamble length
4277 * 03 share open/close flag
4278 * 02 reset
4279 * 01 enable
4280 * 00 auto-CTS enable
4281 */
4282 val = BIT2;
4283
4284 switch(info->params.mode) {
4285 case MGSL_MODE_XSYNC:
4286 val |= BIT15 + BIT13;
4287 break;
4288 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4289 case MGSL_MODE_BISYNC: val |= BIT15; break;
4290 case MGSL_MODE_RAW: val |= BIT13; break;
4291 }
4292 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4293 val |= BIT7;
4294
4295 switch(info->params.encoding)
4296 {
4297 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4298 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4299 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4300 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4301 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4302 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4303 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4304 }
4305
4306 switch (info->params.crc_type & HDLC_CRC_MASK)
4307 {
4308 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4309 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4310 }
4311
4312 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4313 val |= BIT6;
4314
4315 switch (info->params.preamble_length)
4316 {
4317 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4318 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4319 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4320 }
4321
4322 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4323 val |= BIT0;
4324
4325 wr_reg16(info, TCR, val);
4326
4327 /* TPR (transmit preamble) */
4328
4329 switch (info->params.preamble)
4330 {
4331 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4332 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4333 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4334 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4335 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4336 default: val = 0x7e; break;
4337 }
4338 wr_reg8(info, TPR, (unsigned char)val);
4339
4340 /* RCR (rx control)
4341 *
4342 * 15..13 mode
4343 * 000=HDLC/SDLC
4344 * 001=raw bit synchronous
4345 * 010=asynchronous/isochronous
4346 * 011=monosync byte synchronous
4347 * 100=bisync byte synchronous
4348 * 101=xsync byte synchronous
4349 * 12..10 encoding
4350 * 09 CRC enable
4351 * 08 CRC32
4352 * 07..03 reserved, must be 0
4353 * 02 reset
4354 * 01 enable
4355 * 00 auto-DCD enable
4356 */
4357 val = 0;
4358
4359 switch(info->params.mode) {
4360 case MGSL_MODE_XSYNC:
4361 val |= BIT15 + BIT13;
4362 break;
4363 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4364 case MGSL_MODE_BISYNC: val |= BIT15; break;
4365 case MGSL_MODE_RAW: val |= BIT13; break;
4366 }
4367
4368 switch(info->params.encoding)
4369 {
4370 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4371 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4372 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4373 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4374 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4375 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4376 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4377 }
4378
4379 switch (info->params.crc_type & HDLC_CRC_MASK)
4380 {
4381 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4382 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4383 }
4384
4385 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4386 val |= BIT0;
4387
4388 wr_reg16(info, RCR, val);
4389
4390 /* CCR (clock control)
4391 *
4392 * 07..05 tx clock source
4393 * 04..02 rx clock source
4394 * 01 auxclk enable
4395 * 00 BRG enable
4396 */
4397 val = 0;
4398
4399 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4400 {
4401 // when RxC source is DPLL, BRG generates 16X DPLL
4402 // reference clock, so take TxC from BRG/16 to get
4403 // transmit clock at actual data rate
4404 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4405 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4406 else
4407 val |= BIT6; /* 010, txclk = BRG */
4408 }
4409 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4410 val |= BIT7; /* 100, txclk = DPLL Input */
4411 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4412 val |= BIT5; /* 001, txclk = RXC Input */
4413
4414 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4415 val |= BIT3; /* 010, rxclk = BRG */
4416 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4417 val |= BIT4; /* 100, rxclk = DPLL */
4418 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4419 val |= BIT2; /* 001, rxclk = TXC Input */
4420
4421 if (info->params.clock_speed)
4422 val |= BIT1 + BIT0;
4423
4424 wr_reg8(info, CCR, (unsigned char)val);
4425
4426 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4427 {
4428 // program DPLL mode
4429 switch(info->params.encoding)
4430 {
4431 case HDLC_ENCODING_BIPHASE_MARK:
4432 case HDLC_ENCODING_BIPHASE_SPACE:
4433 val = BIT7; break;
4434 case HDLC_ENCODING_BIPHASE_LEVEL:
4435 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4436 val = BIT7 + BIT6; break;
4437 default: val = BIT6; // NRZ encodings
4438 }
4439 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4440
4441 // DPLL requires a 16X reference clock from BRG
4442 set_rate(info, info->params.clock_speed * 16);
4443 }
4444 else
4445 set_rate(info, info->params.clock_speed);
4446
4447 tx_set_idle(info);
4448
4449 msc_set_vcr(info);
4450
4451 /* SCR (serial control)
4452 *
4453 * 15 1=tx req on FIFO half empty
4454 * 14 1=rx req on FIFO half full
4455 * 13 tx data IRQ enable
4456 * 12 tx idle IRQ enable
4457 * 11 underrun IRQ enable
4458 * 10 rx data IRQ enable
4459 * 09 rx idle IRQ enable
4460 * 08 overrun IRQ enable
4461 * 07 DSR IRQ enable
4462 * 06 CTS IRQ enable
4463 * 05 DCD IRQ enable
4464 * 04 RI IRQ enable
4465 * 03 reserved, must be zero
4466 * 02 1=txd->rxd internal loopback enable
4467 * 01 reserved, must be zero
4468 * 00 1=master IRQ enable
4469 */
4470 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4471
4472 if (info->params.loopback)
4473 enable_loopback(info);
4474 }
4475
4476 /*
4477 * set transmit idle mode
4478 */
4479 static void tx_set_idle(struct slgt_info *info)
4480 {
4481 unsigned char val;
4482 unsigned short tcr;
4483
4484 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4485 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4486 */
4487 tcr = rd_reg16(info, TCR);
4488 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4489 /* disable preamble, set idle size to 16 bits */
4490 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4491 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4492 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4493 } else if (!(tcr & BIT6)) {
4494 /* preamble is disabled, set idle size to 8 bits */
4495 tcr &= ~(BIT5 + BIT4);
4496 }
4497 wr_reg16(info, TCR, tcr);
4498
4499 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4500 /* LSB of custom tx idle specified in tx idle register */
4501 val = (unsigned char)(info->idle_mode & 0xff);
4502 } else {
4503 /* standard 8 bit idle patterns */
4504 switch(info->idle_mode)
4505 {
4506 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4507 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4508 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4509 case HDLC_TXIDLE_ZEROS:
4510 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4511 default: val = 0xff;
4512 }
4513 }
4514
4515 wr_reg8(info, TIR, val);
4516 }
4517
4518 /*
4519 * get state of V24 status (input) signals
4520 */
4521 static void get_signals(struct slgt_info *info)
4522 {
4523 unsigned short status = rd_reg16(info, SSR);
4524
4525 /* clear all serial signals except RTS and DTR */
4526 info->signals &= SerialSignal_RTS | SerialSignal_DTR;
4527
4528 if (status & BIT3)
4529 info->signals |= SerialSignal_DSR;
4530 if (status & BIT2)
4531 info->signals |= SerialSignal_CTS;
4532 if (status & BIT1)
4533 info->signals |= SerialSignal_DCD;
4534 if (status & BIT0)
4535 info->signals |= SerialSignal_RI;
4536 }
4537
4538 /*
4539 * set V.24 Control Register based on current configuration
4540 */
4541 static void msc_set_vcr(struct slgt_info *info)
4542 {
4543 unsigned char val = 0;
4544
4545 /* VCR (V.24 control)
4546 *
4547 * 07..04 serial IF select
4548 * 03 DTR
4549 * 02 RTS
4550 * 01 LL
4551 * 00 RL
4552 */
4553
4554 switch(info->if_mode & MGSL_INTERFACE_MASK)
4555 {
4556 case MGSL_INTERFACE_RS232:
4557 val |= BIT5; /* 0010 */
4558 break;
4559 case MGSL_INTERFACE_V35:
4560 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4561 break;
4562 case MGSL_INTERFACE_RS422:
4563 val |= BIT6; /* 0100 */
4564 break;
4565 }
4566
4567 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4568 val |= BIT4;
4569 if (info->signals & SerialSignal_DTR)
4570 val |= BIT3;
4571 if (info->signals & SerialSignal_RTS)
4572 val |= BIT2;
4573 if (info->if_mode & MGSL_INTERFACE_LL)
4574 val |= BIT1;
4575 if (info->if_mode & MGSL_INTERFACE_RL)
4576 val |= BIT0;
4577 wr_reg8(info, VCR, val);
4578 }
4579
4580 /*
4581 * set state of V24 control (output) signals
4582 */
4583 static void set_signals(struct slgt_info *info)
4584 {
4585 unsigned char val = rd_reg8(info, VCR);
4586 if (info->signals & SerialSignal_DTR)
4587 val |= BIT3;
4588 else
4589 val &= ~BIT3;
4590 if (info->signals & SerialSignal_RTS)
4591 val |= BIT2;
4592 else
4593 val &= ~BIT2;
4594 wr_reg8(info, VCR, val);
4595 }
4596
4597 /*
4598 * free range of receive DMA buffers (i to last)
4599 */
4600 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4601 {
4602 int done = 0;
4603
4604 while(!done) {
4605 /* reset current buffer for reuse */
4606 info->rbufs[i].status = 0;
4607 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4608 if (i == last)
4609 done = 1;
4610 if (++i == info->rbuf_count)
4611 i = 0;
4612 }
4613 info->rbuf_current = i;
4614 }
4615
4616 /*
4617 * mark all receive DMA buffers as free
4618 */
4619 static void reset_rbufs(struct slgt_info *info)
4620 {
4621 free_rbufs(info, 0, info->rbuf_count - 1);
4622 info->rbuf_fill_index = 0;
4623 info->rbuf_fill_count = 0;
4624 }
4625
4626 /*
4627 * pass receive HDLC frame to upper layer
4628 *
4629 * return true if frame available, otherwise false
4630 */
4631 static bool rx_get_frame(struct slgt_info *info)
4632 {
4633 unsigned int start, end;
4634 unsigned short status;
4635 unsigned int framesize = 0;
4636 unsigned long flags;
4637 struct tty_struct *tty = info->port.tty;
4638 unsigned char addr_field = 0xff;
4639 unsigned int crc_size = 0;
4640
4641 switch (info->params.crc_type & HDLC_CRC_MASK) {
4642 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4643 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4644 }
4645
4646 check_again:
4647
4648 framesize = 0;
4649 addr_field = 0xff;
4650 start = end = info->rbuf_current;
4651
4652 for (;;) {
4653 if (!desc_complete(info->rbufs[end]))
4654 goto cleanup;
4655
4656 if (framesize == 0 && info->params.addr_filter != 0xff)
4657 addr_field = info->rbufs[end].buf[0];
4658
4659 framesize += desc_count(info->rbufs[end]);
4660
4661 if (desc_eof(info->rbufs[end]))
4662 break;
4663
4664 if (++end == info->rbuf_count)
4665 end = 0;
4666
4667 if (end == info->rbuf_current) {
4668 if (info->rx_enabled){
4669 spin_lock_irqsave(&info->lock,flags);
4670 rx_start(info);
4671 spin_unlock_irqrestore(&info->lock,flags);
4672 }
4673 goto cleanup;
4674 }
4675 }
4676
4677 /* status
4678 *
4679 * 15 buffer complete
4680 * 14..06 reserved
4681 * 05..04 residue
4682 * 02 eof (end of frame)
4683 * 01 CRC error
4684 * 00 abort
4685 */
4686 status = desc_status(info->rbufs[end]);
4687
4688 /* ignore CRC bit if not using CRC (bit is undefined) */
4689 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4690 status &= ~BIT1;
4691
4692 if (framesize == 0 ||
4693 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4694 free_rbufs(info, start, end);
4695 goto check_again;
4696 }
4697
4698 if (framesize < (2 + crc_size) || status & BIT0) {
4699 info->icount.rxshort++;
4700 framesize = 0;
4701 } else if (status & BIT1) {
4702 info->icount.rxcrc++;
4703 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4704 framesize = 0;
4705 }
4706
4707 #if SYNCLINK_GENERIC_HDLC
4708 if (framesize == 0) {
4709 info->netdev->stats.rx_errors++;
4710 info->netdev->stats.rx_frame_errors++;
4711 }
4712 #endif
4713
4714 DBGBH(("%s rx frame status=%04X size=%d\n",
4715 info->device_name, status, framesize));
4716 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4717
4718 if (framesize) {
4719 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4720 framesize -= crc_size;
4721 crc_size = 0;
4722 }
4723
4724 if (framesize > info->max_frame_size + crc_size)
4725 info->icount.rxlong++;
4726 else {
4727 /* copy dma buffer(s) to contiguous temp buffer */
4728 int copy_count = framesize;
4729 int i = start;
4730 unsigned char *p = info->tmp_rbuf;
4731 info->tmp_rbuf_count = framesize;
4732
4733 info->icount.rxok++;
4734
4735 while(copy_count) {
4736 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4737 memcpy(p, info->rbufs[i].buf, partial_count);
4738 p += partial_count;
4739 copy_count -= partial_count;
4740 if (++i == info->rbuf_count)
4741 i = 0;
4742 }
4743
4744 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4745 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4746 framesize++;
4747 }
4748
4749 #if SYNCLINK_GENERIC_HDLC
4750 if (info->netcount)
4751 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4752 else
4753 #endif
4754 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4755 }
4756 }
4757 free_rbufs(info, start, end);
4758 return true;
4759
4760 cleanup:
4761 return false;
4762 }
4763
4764 /*
4765 * pass receive buffer (RAW synchronous mode) to tty layer
4766 * return true if buffer available, otherwise false
4767 */
4768 static bool rx_get_buf(struct slgt_info *info)
4769 {
4770 unsigned int i = info->rbuf_current;
4771 unsigned int count;
4772
4773 if (!desc_complete(info->rbufs[i]))
4774 return false;
4775 count = desc_count(info->rbufs[i]);
4776 switch(info->params.mode) {
4777 case MGSL_MODE_MONOSYNC:
4778 case MGSL_MODE_BISYNC:
4779 case MGSL_MODE_XSYNC:
4780 /* ignore residue in byte synchronous modes */
4781 if (desc_residue(info->rbufs[i]))
4782 count--;
4783 break;
4784 }
4785 DBGDATA(info, info->rbufs[i].buf, count, "rx");
4786 DBGINFO(("rx_get_buf size=%d\n", count));
4787 if (count)
4788 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4789 info->flag_buf, count);
4790 free_rbufs(info, i, i);
4791 return true;
4792 }
4793
4794 static void reset_tbufs(struct slgt_info *info)
4795 {
4796 unsigned int i;
4797 info->tbuf_current = 0;
4798 for (i=0 ; i < info->tbuf_count ; i++) {
4799 info->tbufs[i].status = 0;
4800 info->tbufs[i].count = 0;
4801 }
4802 }
4803
4804 /*
4805 * return number of free transmit DMA buffers
4806 */
4807 static unsigned int free_tbuf_count(struct slgt_info *info)
4808 {
4809 unsigned int count = 0;
4810 unsigned int i = info->tbuf_current;
4811
4812 do
4813 {
4814 if (desc_count(info->tbufs[i]))
4815 break; /* buffer in use */
4816 ++count;
4817 if (++i == info->tbuf_count)
4818 i=0;
4819 } while (i != info->tbuf_current);
4820
4821 /* if tx DMA active, last zero count buffer is in use */
4822 if (count && (rd_reg32(info, TDCSR) & BIT0))
4823 --count;
4824
4825 return count;
4826 }
4827
4828 /*
4829 * return number of bytes in unsent transmit DMA buffers
4830 * and the serial controller tx FIFO
4831 */
4832 static unsigned int tbuf_bytes(struct slgt_info *info)
4833 {
4834 unsigned int total_count = 0;
4835 unsigned int i = info->tbuf_current;
4836 unsigned int reg_value;
4837 unsigned int count;
4838 unsigned int active_buf_count = 0;
4839
4840 /*
4841 * Add descriptor counts for all tx DMA buffers.
4842 * If count is zero (cleared by DMA controller after read),
4843 * the buffer is complete or is actively being read from.
4844 *
4845 * Record buf_count of last buffer with zero count starting
4846 * from current ring position. buf_count is mirror
4847 * copy of count and is not cleared by serial controller.
4848 * If DMA controller is active, that buffer is actively
4849 * being read so add to total.
4850 */
4851 do {
4852 count = desc_count(info->tbufs[i]);
4853 if (count)
4854 total_count += count;
4855 else if (!total_count)
4856 active_buf_count = info->tbufs[i].buf_count;
4857 if (++i == info->tbuf_count)
4858 i = 0;
4859 } while (i != info->tbuf_current);
4860
4861 /* read tx DMA status register */
4862 reg_value = rd_reg32(info, TDCSR);
4863
4864 /* if tx DMA active, last zero count buffer is in use */
4865 if (reg_value & BIT0)
4866 total_count += active_buf_count;
4867
4868 /* add tx FIFO count = reg_value[15..8] */
4869 total_count += (reg_value >> 8) & 0xff;
4870
4871 /* if transmitter active add one byte for shift register */
4872 if (info->tx_active)
4873 total_count++;
4874
4875 return total_count;
4876 }
4877
4878 /*
4879 * load data into transmit DMA buffer ring and start transmitter if needed
4880 * return true if data accepted, otherwise false (buffers full)
4881 */
4882 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4883 {
4884 unsigned short count;
4885 unsigned int i;
4886 struct slgt_desc *d;
4887
4888 /* check required buffer space */
4889 if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info))
4890 return false;
4891
4892 DBGDATA(info, buf, size, "tx");
4893
4894 /*
4895 * copy data to one or more DMA buffers in circular ring
4896 * tbuf_start = first buffer for this data
4897 * tbuf_current = next free buffer
4898 *
4899 * Copy all data before making data visible to DMA controller by
4900 * setting descriptor count of the first buffer.
4901 * This prevents an active DMA controller from reading the first DMA
4902 * buffers of a frame and stopping before the final buffers are filled.
4903 */
4904
4905 info->tbuf_start = i = info->tbuf_current;
4906
4907 while (size) {
4908 d = &info->tbufs[i];
4909
4910 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4911 memcpy(d->buf, buf, count);
4912
4913 size -= count;
4914 buf += count;
4915
4916 /*
4917 * set EOF bit for last buffer of HDLC frame or
4918 * for every buffer in raw mode
4919 */
4920 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4921 info->params.mode == MGSL_MODE_RAW)
4922 set_desc_eof(*d, 1);
4923 else
4924 set_desc_eof(*d, 0);
4925
4926 /* set descriptor count for all but first buffer */
4927 if (i != info->tbuf_start)
4928 set_desc_count(*d, count);
4929 d->buf_count = count;
4930
4931 if (++i == info->tbuf_count)
4932 i = 0;
4933 }
4934
4935 info->tbuf_current = i;
4936
4937 /* set first buffer count to make new data visible to DMA controller */
4938 d = &info->tbufs[info->tbuf_start];
4939 set_desc_count(*d, d->buf_count);
4940
4941 /* start transmitter if needed and update transmit timeout */
4942 if (!info->tx_active)
4943 tx_start(info);
4944 update_tx_timer(info);
4945
4946 return true;
4947 }
4948
4949 static int register_test(struct slgt_info *info)
4950 {
4951 static unsigned short patterns[] =
4952 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4953 static unsigned int count = ARRAY_SIZE(patterns);
4954 unsigned int i;
4955 int rc = 0;
4956
4957 for (i=0 ; i < count ; i++) {
4958 wr_reg16(info, TIR, patterns[i]);
4959 wr_reg16(info, BDR, patterns[(i+1)%count]);
4960 if ((rd_reg16(info, TIR) != patterns[i]) ||
4961 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4962 rc = -ENODEV;
4963 break;
4964 }
4965 }
4966 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4967 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4968 return rc;
4969 }
4970
4971 static int irq_test(struct slgt_info *info)
4972 {
4973 unsigned long timeout;
4974 unsigned long flags;
4975 struct tty_struct *oldtty = info->port.tty;
4976 u32 speed = info->params.data_rate;
4977
4978 info->params.data_rate = 921600;
4979 info->port.tty = NULL;
4980
4981 spin_lock_irqsave(&info->lock, flags);
4982 async_mode(info);
4983 slgt_irq_on(info, IRQ_TXIDLE);
4984
4985 /* enable transmitter */
4986 wr_reg16(info, TCR,
4987 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4988
4989 /* write one byte and wait for tx idle */
4990 wr_reg16(info, TDR, 0);
4991
4992 /* assume failure */
4993 info->init_error = DiagStatus_IrqFailure;
4994 info->irq_occurred = false;
4995
4996 spin_unlock_irqrestore(&info->lock, flags);
4997
4998 timeout=100;
4999 while(timeout-- && !info->irq_occurred)
5000 msleep_interruptible(10);
5001
5002 spin_lock_irqsave(&info->lock,flags);
5003 reset_port(info);
5004 spin_unlock_irqrestore(&info->lock,flags);
5005
5006 info->params.data_rate = speed;
5007 info->port.tty = oldtty;
5008
5009 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
5010 return info->irq_occurred ? 0 : -ENODEV;
5011 }
5012
5013 static int loopback_test_rx(struct slgt_info *info)
5014 {
5015 unsigned char *src, *dest;
5016 int count;
5017
5018 if (desc_complete(info->rbufs[0])) {
5019 count = desc_count(info->rbufs[0]);
5020 src = info->rbufs[0].buf;
5021 dest = info->tmp_rbuf;
5022
5023 for( ; count ; count-=2, src+=2) {
5024 /* src=data byte (src+1)=status byte */
5025 if (!(*(src+1) & (BIT9 + BIT8))) {
5026 *dest = *src;
5027 dest++;
5028 info->tmp_rbuf_count++;
5029 }
5030 }
5031 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
5032 return 1;
5033 }
5034 return 0;
5035 }
5036
5037 static int loopback_test(struct slgt_info *info)
5038 {
5039 #define TESTFRAMESIZE 20
5040
5041 unsigned long timeout;
5042 u16 count = TESTFRAMESIZE;
5043 unsigned char buf[TESTFRAMESIZE];
5044 int rc = -ENODEV;
5045 unsigned long flags;
5046
5047 struct tty_struct *oldtty = info->port.tty;
5048 MGSL_PARAMS params;
5049
5050 memcpy(&params, &info->params, sizeof(params));
5051
5052 info->params.mode = MGSL_MODE_ASYNC;
5053 info->params.data_rate = 921600;
5054 info->params.loopback = 1;
5055 info->port.tty = NULL;
5056
5057 /* build and send transmit frame */
5058 for (count = 0; count < TESTFRAMESIZE; ++count)
5059 buf[count] = (unsigned char)count;
5060
5061 info->tmp_rbuf_count = 0;
5062 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
5063
5064 /* program hardware for HDLC and enabled receiver */
5065 spin_lock_irqsave(&info->lock,flags);
5066 async_mode(info);
5067 rx_start(info);
5068 tx_load(info, buf, count);
5069 spin_unlock_irqrestore(&info->lock, flags);
5070
5071 /* wait for receive complete */
5072 for (timeout = 100; timeout; --timeout) {
5073 msleep_interruptible(10);
5074 if (loopback_test_rx(info)) {
5075 rc = 0;
5076 break;
5077 }
5078 }
5079
5080 /* verify received frame length and contents */
5081 if (!rc && (info->tmp_rbuf_count != count ||
5082 memcmp(buf, info->tmp_rbuf, count))) {
5083 rc = -ENODEV;
5084 }
5085
5086 spin_lock_irqsave(&info->lock,flags);
5087 reset_adapter(info);
5088 spin_unlock_irqrestore(&info->lock,flags);
5089
5090 memcpy(&info->params, &params, sizeof(info->params));
5091 info->port.tty = oldtty;
5092
5093 info->init_error = rc ? DiagStatus_DmaFailure : 0;
5094 return rc;
5095 }
5096
5097 static int adapter_test(struct slgt_info *info)
5098 {
5099 DBGINFO(("testing %s\n", info->device_name));
5100 if (register_test(info) < 0) {
5101 printk("register test failure %s addr=%08X\n",
5102 info->device_name, info->phys_reg_addr);
5103 } else if (irq_test(info) < 0) {
5104 printk("IRQ test failure %s IRQ=%d\n",
5105 info->device_name, info->irq_level);
5106 } else if (loopback_test(info) < 0) {
5107 printk("loopback test failure %s\n", info->device_name);
5108 }
5109 return info->init_error;
5110 }
5111
5112 /*
5113 * transmit timeout handler
5114 */
5115 static void tx_timeout(unsigned long context)
5116 {
5117 struct slgt_info *info = (struct slgt_info*)context;
5118 unsigned long flags;
5119
5120 DBGINFO(("%s tx_timeout\n", info->device_name));
5121 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5122 info->icount.txtimeout++;
5123 }
5124 spin_lock_irqsave(&info->lock,flags);
5125 tx_stop(info);
5126 spin_unlock_irqrestore(&info->lock,flags);
5127
5128 #if SYNCLINK_GENERIC_HDLC
5129 if (info->netcount)
5130 hdlcdev_tx_done(info);
5131 else
5132 #endif
5133 bh_transmit(info);
5134 }
5135
5136 /*
5137 * receive buffer polling timer
5138 */
5139 static void rx_timeout(unsigned long context)
5140 {
5141 struct slgt_info *info = (struct slgt_info*)context;
5142 unsigned long flags;
5143
5144 DBGINFO(("%s rx_timeout\n", info->device_name));
5145 spin_lock_irqsave(&info->lock, flags);
5146 info->pending_bh |= BH_RECEIVE;
5147 spin_unlock_irqrestore(&info->lock, flags);
5148 bh_handler(&info->task);
5149 }
5150
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