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Commit | Line | Data |
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74ba9207 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Driver for high-speed SCC boards (those with DMA support) | |
4 | * Copyright (C) 1997-2000 Klaus Kudielka | |
5 | * | |
6 | * S5SCC/DMA support by Janko Koleznik S52HI | |
1da177e4 LT |
7 | */ |
8 | ||
9 | ||
10 | #include <linux/module.h> | |
1977f032 | 11 | #include <linux/bitops.h> |
1da177e4 LT |
12 | #include <linux/delay.h> |
13 | #include <linux/errno.h> | |
14 | #include <linux/if_arp.h> | |
15 | #include <linux/in.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/ioport.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/netdevice.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
1da177e4 LT |
23 | #include <linux/rtnetlink.h> |
24 | #include <linux/sockios.h> | |
25 | #include <linux/workqueue.h> | |
60063497 | 26 | #include <linux/atomic.h> |
1da177e4 LT |
27 | #include <asm/dma.h> |
28 | #include <asm/io.h> | |
29 | #include <asm/irq.h> | |
7c0f6ba6 | 30 | #include <linux/uaccess.h> |
1da177e4 LT |
31 | #include <net/ax25.h> |
32 | #include "z8530.h" | |
33 | ||
34 | ||
35 | /* Number of buffers per channel */ | |
36 | ||
37 | #define NUM_TX_BUF 2 /* NUM_TX_BUF >= 1 (min. 2 recommended) */ | |
38 | #define NUM_RX_BUF 6 /* NUM_RX_BUF >= 1 (min. 2 recommended) */ | |
39 | #define BUF_SIZE 1576 /* BUF_SIZE >= mtu + hard_header_len */ | |
40 | ||
41 | ||
42 | /* Cards supported */ | |
43 | ||
44 | #define HW_PI { "Ottawa PI", 0x300, 0x20, 0x10, 8, \ | |
45 | 0, 8, 1843200, 3686400 } | |
46 | #define HW_PI2 { "Ottawa PI2", 0x300, 0x20, 0x10, 8, \ | |
47 | 0, 8, 3686400, 7372800 } | |
48 | #define HW_TWIN { "Gracilis PackeTwin", 0x200, 0x10, 0x10, 32, \ | |
49 | 0, 4, 6144000, 6144000 } | |
50 | #define HW_S5 { "S5SCC/DMA", 0x200, 0x10, 0x10, 32, \ | |
51 | 0, 8, 4915200, 9830400 } | |
52 | ||
53 | #define HARDWARE { HW_PI, HW_PI2, HW_TWIN, HW_S5 } | |
54 | ||
55 | #define TMR_0_HZ 25600 /* Frequency of timer 0 */ | |
56 | ||
57 | #define TYPE_PI 0 | |
58 | #define TYPE_PI2 1 | |
59 | #define TYPE_TWIN 2 | |
60 | #define TYPE_S5 3 | |
61 | #define NUM_TYPES 4 | |
62 | ||
63 | #define MAX_NUM_DEVS 32 | |
64 | ||
65 | ||
66 | /* SCC chips supported */ | |
67 | ||
68 | #define Z8530 0 | |
69 | #define Z85C30 1 | |
70 | #define Z85230 2 | |
71 | ||
72 | #define CHIPNAMES { "Z8530", "Z85C30", "Z85230" } | |
73 | ||
74 | ||
75 | /* I/O registers */ | |
76 | ||
77 | /* 8530 registers relative to card base */ | |
78 | #define SCCB_CMD 0x00 | |
79 | #define SCCB_DATA 0x01 | |
80 | #define SCCA_CMD 0x02 | |
81 | #define SCCA_DATA 0x03 | |
82 | ||
83 | /* 8253/8254 registers relative to card base */ | |
84 | #define TMR_CNT0 0x00 | |
85 | #define TMR_CNT1 0x01 | |
86 | #define TMR_CNT2 0x02 | |
87 | #define TMR_CTRL 0x03 | |
88 | ||
89 | /* Additional PI/PI2 registers relative to card base */ | |
90 | #define PI_DREQ_MASK 0x04 | |
91 | ||
92 | /* Additional PackeTwin registers relative to card base */ | |
93 | #define TWIN_INT_REG 0x08 | |
94 | #define TWIN_CLR_TMR1 0x09 | |
95 | #define TWIN_CLR_TMR2 0x0a | |
96 | #define TWIN_SPARE_1 0x0b | |
97 | #define TWIN_DMA_CFG 0x08 | |
98 | #define TWIN_SERIAL_CFG 0x09 | |
99 | #define TWIN_DMA_CLR_FF 0x0a | |
100 | #define TWIN_SPARE_2 0x0b | |
101 | ||
102 | ||
103 | /* PackeTwin I/O register values */ | |
104 | ||
105 | /* INT_REG */ | |
106 | #define TWIN_SCC_MSK 0x01 | |
107 | #define TWIN_TMR1_MSK 0x02 | |
108 | #define TWIN_TMR2_MSK 0x04 | |
109 | #define TWIN_INT_MSK 0x07 | |
110 | ||
111 | /* SERIAL_CFG */ | |
112 | #define TWIN_DTRA_ON 0x01 | |
113 | #define TWIN_DTRB_ON 0x02 | |
114 | #define TWIN_EXTCLKA 0x04 | |
115 | #define TWIN_EXTCLKB 0x08 | |
116 | #define TWIN_LOOPA_ON 0x10 | |
117 | #define TWIN_LOOPB_ON 0x20 | |
118 | #define TWIN_EI 0x80 | |
119 | ||
120 | /* DMA_CFG */ | |
121 | #define TWIN_DMA_HDX_T1 0x08 | |
122 | #define TWIN_DMA_HDX_R1 0x0a | |
123 | #define TWIN_DMA_HDX_T3 0x14 | |
124 | #define TWIN_DMA_HDX_R3 0x16 | |
125 | #define TWIN_DMA_FDX_T3R1 0x1b | |
126 | #define TWIN_DMA_FDX_T1R3 0x1d | |
127 | ||
128 | ||
129 | /* Status values */ | |
130 | ||
131 | #define IDLE 0 | |
132 | #define TX_HEAD 1 | |
133 | #define TX_DATA 2 | |
134 | #define TX_PAUSE 3 | |
135 | #define TX_TAIL 4 | |
136 | #define RTS_OFF 5 | |
137 | #define WAIT 6 | |
138 | #define DCD_ON 7 | |
139 | #define RX_ON 8 | |
140 | #define DCD_OFF 9 | |
141 | ||
142 | ||
143 | /* Ioctls */ | |
144 | ||
145 | #define SIOCGSCCPARAM SIOCDEVPRIVATE | |
146 | #define SIOCSSCCPARAM (SIOCDEVPRIVATE+1) | |
147 | ||
148 | ||
149 | /* Data types */ | |
150 | ||
151 | struct scc_param { | |
152 | int pclk_hz; /* frequency of BRG input (don't change) */ | |
153 | int brg_tc; /* BRG terminal count; BRG disabled if < 0 */ | |
154 | int nrzi; /* 0 (nrz), 1 (nrzi) */ | |
155 | int clocks; /* see dmascc_cfg documentation */ | |
156 | int txdelay; /* [1/TMR_0_HZ] */ | |
157 | int txtimeout; /* [1/HZ] */ | |
158 | int txtail; /* [1/TMR_0_HZ] */ | |
159 | int waittime; /* [1/TMR_0_HZ] */ | |
160 | int slottime; /* [1/TMR_0_HZ] */ | |
161 | int persist; /* 1 ... 256 */ | |
162 | int dma; /* -1 (disable), 0, 1, 3 */ | |
163 | int txpause; /* [1/TMR_0_HZ] */ | |
164 | int rtsoff; /* [1/TMR_0_HZ] */ | |
165 | int dcdon; /* [1/TMR_0_HZ] */ | |
166 | int dcdoff; /* [1/TMR_0_HZ] */ | |
167 | }; | |
168 | ||
169 | struct scc_hardware { | |
170 | char *name; | |
171 | int io_region; | |
172 | int io_delta; | |
173 | int io_size; | |
174 | int num_devs; | |
175 | int scc_offset; | |
176 | int tmr_offset; | |
177 | int tmr_hz; | |
178 | int pclk_hz; | |
179 | }; | |
180 | ||
181 | struct scc_priv { | |
182 | int type; | |
183 | int chip; | |
184 | struct net_device *dev; | |
185 | struct scc_info *info; | |
13c0582d | 186 | |
1da177e4 LT |
187 | int channel; |
188 | int card_base, scc_cmd, scc_data; | |
189 | int tmr_cnt, tmr_ctrl, tmr_mode; | |
190 | struct scc_param param; | |
191 | char rx_buf[NUM_RX_BUF][BUF_SIZE]; | |
192 | int rx_len[NUM_RX_BUF]; | |
193 | int rx_ptr; | |
194 | struct work_struct rx_work; | |
195 | int rx_head, rx_tail, rx_count; | |
196 | int rx_over; | |
197 | char tx_buf[NUM_TX_BUF][BUF_SIZE]; | |
198 | int tx_len[NUM_TX_BUF]; | |
199 | int tx_ptr; | |
200 | int tx_head, tx_tail, tx_count; | |
201 | int state; | |
202 | unsigned long tx_start; | |
203 | int rr0; | |
204 | spinlock_t *register_lock; /* Per scc_info */ | |
205 | spinlock_t ring_lock; | |
206 | }; | |
207 | ||
208 | struct scc_info { | |
209 | int irq_used; | |
210 | int twin_serial_cfg; | |
211 | struct net_device *dev[2]; | |
212 | struct scc_priv priv[2]; | |
213 | struct scc_info *next; | |
214 | spinlock_t register_lock; /* Per device register lock */ | |
215 | }; | |
216 | ||
217 | ||
218 | /* Function declarations */ | |
219 | static int setup_adapter(int card_base, int type, int n) __init; | |
220 | ||
221 | static void write_scc(struct scc_priv *priv, int reg, int val); | |
222 | static void write_scc_data(struct scc_priv *priv, int val, int fast); | |
223 | static int read_scc(struct scc_priv *priv, int reg); | |
224 | static int read_scc_data(struct scc_priv *priv); | |
225 | ||
226 | static int scc_open(struct net_device *dev); | |
227 | static int scc_close(struct net_device *dev); | |
228 | static int scc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); | |
229 | static int scc_send_packet(struct sk_buff *skb, struct net_device *dev); | |
1da177e4 LT |
230 | static int scc_set_mac_address(struct net_device *dev, void *sa); |
231 | ||
232 | static inline void tx_on(struct scc_priv *priv); | |
233 | static inline void rx_on(struct scc_priv *priv); | |
234 | static inline void rx_off(struct scc_priv *priv); | |
235 | static void start_timer(struct scc_priv *priv, int t, int r15); | |
236 | static inline unsigned char random(void); | |
237 | ||
238 | static inline void z8530_isr(struct scc_info *info); | |
7d12e780 | 239 | static irqreturn_t scc_isr(int irq, void *dev_id); |
1da177e4 LT |
240 | static void rx_isr(struct scc_priv *priv); |
241 | static void special_condition(struct scc_priv *priv, int rc); | |
7a87b6c2 | 242 | static void rx_bh(struct work_struct *); |
1da177e4 LT |
243 | static void tx_isr(struct scc_priv *priv); |
244 | static void es_isr(struct scc_priv *priv); | |
245 | static void tm_isr(struct scc_priv *priv); | |
246 | ||
247 | ||
248 | /* Initialization variables */ | |
249 | ||
250 | static int io[MAX_NUM_DEVS] __initdata = { 0, }; | |
251 | ||
cd8d627a RD |
252 | /* Beware! hw[] is also used in dmascc_exit(). */ |
253 | static struct scc_hardware hw[NUM_TYPES] = HARDWARE; | |
1da177e4 LT |
254 | |
255 | ||
256 | /* Global variables */ | |
257 | ||
258 | static struct scc_info *first; | |
259 | static unsigned long rand; | |
260 | ||
261 | ||
262 | MODULE_AUTHOR("Klaus Kudielka"); | |
263 | MODULE_DESCRIPTION("Driver for high-speed SCC boards"); | |
b658e5d8 | 264 | module_param_hw_array(io, int, ioport, NULL, 0); |
1da177e4 LT |
265 | MODULE_LICENSE("GPL"); |
266 | ||
267 | static void __exit dmascc_exit(void) | |
268 | { | |
269 | int i; | |
270 | struct scc_info *info; | |
271 | ||
272 | while (first) { | |
273 | info = first; | |
274 | ||
275 | /* Unregister devices */ | |
276 | for (i = 0; i < 2; i++) | |
277 | unregister_netdev(info->dev[i]); | |
278 | ||
279 | /* Reset board */ | |
280 | if (info->priv[0].type == TYPE_TWIN) | |
281 | outb(0, info->dev[0]->base_addr + TWIN_SERIAL_CFG); | |
282 | write_scc(&info->priv[0], R9, FHWRES); | |
283 | release_region(info->dev[0]->base_addr, | |
284 | hw[info->priv[0].type].io_size); | |
285 | ||
286 | for (i = 0; i < 2; i++) | |
287 | free_netdev(info->dev[i]); | |
288 | ||
289 | /* Free memory */ | |
290 | first = info->next; | |
291 | kfree(info); | |
292 | } | |
293 | } | |
294 | ||
1da177e4 LT |
295 | static int __init dmascc_init(void) |
296 | { | |
297 | int h, i, j, n; | |
298 | int base[MAX_NUM_DEVS], tcmd[MAX_NUM_DEVS], t0[MAX_NUM_DEVS], | |
299 | t1[MAX_NUM_DEVS]; | |
300 | unsigned t_val; | |
301 | unsigned long time, start[MAX_NUM_DEVS], delay[MAX_NUM_DEVS], | |
302 | counting[MAX_NUM_DEVS]; | |
303 | ||
304 | /* Initialize random number generator */ | |
305 | rand = jiffies; | |
306 | /* Cards found = 0 */ | |
307 | n = 0; | |
308 | /* Warning message */ | |
309 | if (!io[0]) | |
310 | printk(KERN_INFO "dmascc: autoprobing (dangerous)\n"); | |
311 | ||
312 | /* Run autodetection for each card type */ | |
313 | for (h = 0; h < NUM_TYPES; h++) { | |
314 | ||
315 | if (io[0]) { | |
316 | /* User-specified I/O address regions */ | |
317 | for (i = 0; i < hw[h].num_devs; i++) | |
318 | base[i] = 0; | |
319 | for (i = 0; i < MAX_NUM_DEVS && io[i]; i++) { | |
320 | j = (io[i] - | |
321 | hw[h].io_region) / hw[h].io_delta; | |
8e95a202 JP |
322 | if (j >= 0 && j < hw[h].num_devs && |
323 | hw[h].io_region + | |
1da177e4 LT |
324 | j * hw[h].io_delta == io[i]) { |
325 | base[j] = io[i]; | |
326 | } | |
327 | } | |
328 | } else { | |
329 | /* Default I/O address regions */ | |
330 | for (i = 0; i < hw[h].num_devs; i++) { | |
331 | base[i] = | |
332 | hw[h].io_region + i * hw[h].io_delta; | |
333 | } | |
334 | } | |
335 | ||
336 | /* Check valid I/O address regions */ | |
337 | for (i = 0; i < hw[h].num_devs; i++) | |
338 | if (base[i]) { | |
339 | if (!request_region | |
340 | (base[i], hw[h].io_size, "dmascc")) | |
341 | base[i] = 0; | |
342 | else { | |
343 | tcmd[i] = | |
344 | base[i] + hw[h].tmr_offset + | |
345 | TMR_CTRL; | |
346 | t0[i] = | |
347 | base[i] + hw[h].tmr_offset + | |
348 | TMR_CNT0; | |
349 | t1[i] = | |
350 | base[i] + hw[h].tmr_offset + | |
351 | TMR_CNT1; | |
352 | } | |
353 | } | |
354 | ||
355 | /* Start timers */ | |
356 | for (i = 0; i < hw[h].num_devs; i++) | |
357 | if (base[i]) { | |
358 | /* Timer 0: LSB+MSB, Mode 3, TMR_0_HZ */ | |
359 | outb(0x36, tcmd[i]); | |
360 | outb((hw[h].tmr_hz / TMR_0_HZ) & 0xFF, | |
361 | t0[i]); | |
362 | outb((hw[h].tmr_hz / TMR_0_HZ) >> 8, | |
363 | t0[i]); | |
364 | /* Timer 1: LSB+MSB, Mode 0, HZ/10 */ | |
365 | outb(0x70, tcmd[i]); | |
366 | outb((TMR_0_HZ / HZ * 10) & 0xFF, t1[i]); | |
367 | outb((TMR_0_HZ / HZ * 10) >> 8, t1[i]); | |
368 | start[i] = jiffies; | |
369 | delay[i] = 0; | |
370 | counting[i] = 1; | |
371 | /* Timer 2: LSB+MSB, Mode 0 */ | |
372 | outb(0xb0, tcmd[i]); | |
373 | } | |
374 | time = jiffies; | |
375 | /* Wait until counter registers are loaded */ | |
376 | udelay(2000000 / TMR_0_HZ); | |
377 | ||
378 | /* Timing loop */ | |
379 | while (jiffies - time < 13) { | |
380 | for (i = 0; i < hw[h].num_devs; i++) | |
381 | if (base[i] && counting[i]) { | |
382 | /* Read back Timer 1: latch; read LSB; read MSB */ | |
383 | outb(0x40, tcmd[i]); | |
384 | t_val = | |
385 | inb(t1[i]) + (inb(t1[i]) << 8); | |
386 | /* Also check whether counter did wrap */ | |
8e95a202 JP |
387 | if (t_val == 0 || |
388 | t_val > TMR_0_HZ / HZ * 10) | |
1da177e4 LT |
389 | counting[i] = 0; |
390 | delay[i] = jiffies - start[i]; | |
391 | } | |
392 | } | |
393 | ||
394 | /* Evaluate measurements */ | |
395 | for (i = 0; i < hw[h].num_devs; i++) | |
396 | if (base[i]) { | |
397 | if ((delay[i] >= 9 && delay[i] <= 11) && | |
398 | /* Ok, we have found an adapter */ | |
399 | (setup_adapter(base[i], h, n) == 0)) | |
400 | n++; | |
401 | else | |
402 | release_region(base[i], | |
403 | hw[h].io_size); | |
404 | } | |
405 | ||
406 | } /* NUM_TYPES */ | |
407 | ||
408 | /* If any adapter was successfully initialized, return ok */ | |
409 | if (n) | |
410 | return 0; | |
411 | ||
412 | /* If no adapter found, return error */ | |
413 | printk(KERN_INFO "dmascc: no adapters found\n"); | |
414 | return -EIO; | |
415 | } | |
416 | ||
417 | module_init(dmascc_init); | |
418 | module_exit(dmascc_exit); | |
419 | ||
e2fdbc03 | 420 | static void __init dev_setup(struct net_device *dev) |
1da177e4 LT |
421 | { |
422 | dev->type = ARPHRD_AX25; | |
c4bc7ee2 | 423 | dev->hard_header_len = AX25_MAX_HEADER_LEN; |
1da177e4 | 424 | dev->mtu = 1500; |
c4bc7ee2 | 425 | dev->addr_len = AX25_ADDR_LEN; |
1da177e4 | 426 | dev->tx_queue_len = 64; |
15b1c0e8 RB |
427 | memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); |
428 | memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN); | |
1da177e4 LT |
429 | } |
430 | ||
52db6250 SH |
431 | static const struct net_device_ops scc_netdev_ops = { |
432 | .ndo_open = scc_open, | |
433 | .ndo_stop = scc_close, | |
434 | .ndo_start_xmit = scc_send_packet, | |
435 | .ndo_do_ioctl = scc_ioctl, | |
3e8af307 | 436 | .ndo_set_mac_address = scc_set_mac_address, |
52db6250 SH |
437 | }; |
438 | ||
1da177e4 LT |
439 | static int __init setup_adapter(int card_base, int type, int n) |
440 | { | |
37ace20a | 441 | int i, irq, chip, err; |
1da177e4 LT |
442 | struct scc_info *info; |
443 | struct net_device *dev; | |
444 | struct scc_priv *priv; | |
445 | unsigned long time; | |
446 | unsigned int irqs; | |
447 | int tmr_base = card_base + hw[type].tmr_offset; | |
448 | int scc_base = card_base + hw[type].scc_offset; | |
449 | char *chipnames[] = CHIPNAMES; | |
450 | ||
dd00cc48 YP |
451 | /* Initialize what is necessary for write_scc and write_scc_data */ |
452 | info = kzalloc(sizeof(struct scc_info), GFP_KERNEL | GFP_DMA); | |
37ace20a AKC |
453 | if (!info) { |
454 | err = -ENOMEM; | |
1da177e4 | 455 | goto out; |
37ace20a | 456 | } |
1da177e4 | 457 | |
c835a677 | 458 | info->dev[0] = alloc_netdev(0, "", NET_NAME_UNKNOWN, dev_setup); |
1da177e4 LT |
459 | if (!info->dev[0]) { |
460 | printk(KERN_ERR "dmascc: " | |
461 | "could not allocate memory for %s at %#3x\n", | |
462 | hw[type].name, card_base); | |
37ace20a | 463 | err = -ENOMEM; |
1da177e4 LT |
464 | goto out1; |
465 | } | |
466 | ||
c835a677 | 467 | info->dev[1] = alloc_netdev(0, "", NET_NAME_UNKNOWN, dev_setup); |
1da177e4 LT |
468 | if (!info->dev[1]) { |
469 | printk(KERN_ERR "dmascc: " | |
470 | "could not allocate memory for %s at %#3x\n", | |
471 | hw[type].name, card_base); | |
37ace20a | 472 | err = -ENOMEM; |
1da177e4 LT |
473 | goto out2; |
474 | } | |
475 | spin_lock_init(&info->register_lock); | |
476 | ||
477 | priv = &info->priv[0]; | |
478 | priv->type = type; | |
479 | priv->card_base = card_base; | |
480 | priv->scc_cmd = scc_base + SCCA_CMD; | |
481 | priv->scc_data = scc_base + SCCA_DATA; | |
482 | priv->register_lock = &info->register_lock; | |
483 | ||
484 | /* Reset SCC */ | |
485 | write_scc(priv, R9, FHWRES | MIE | NV); | |
486 | ||
487 | /* Determine type of chip by enabling SDLC/HDLC enhancements */ | |
488 | write_scc(priv, R15, SHDLCE); | |
489 | if (!read_scc(priv, R15)) { | |
490 | /* WR7' not present. This is an ordinary Z8530 SCC. */ | |
491 | chip = Z8530; | |
492 | } else { | |
493 | /* Put one character in TX FIFO */ | |
494 | write_scc_data(priv, 0, 0); | |
495 | if (read_scc(priv, R0) & Tx_BUF_EMP) { | |
496 | /* TX FIFO not full. This is a Z85230 ESCC with a 4-byte FIFO. */ | |
497 | chip = Z85230; | |
498 | } else { | |
499 | /* TX FIFO full. This is a Z85C30 SCC with a 1-byte FIFO. */ | |
500 | chip = Z85C30; | |
501 | } | |
502 | } | |
503 | write_scc(priv, R15, 0); | |
504 | ||
505 | /* Start IRQ auto-detection */ | |
506 | irqs = probe_irq_on(); | |
507 | ||
508 | /* Enable interrupts */ | |
509 | if (type == TYPE_TWIN) { | |
510 | outb(0, card_base + TWIN_DMA_CFG); | |
511 | inb(card_base + TWIN_CLR_TMR1); | |
512 | inb(card_base + TWIN_CLR_TMR2); | |
513 | info->twin_serial_cfg = TWIN_EI; | |
514 | outb(info->twin_serial_cfg, card_base + TWIN_SERIAL_CFG); | |
515 | } else { | |
516 | write_scc(priv, R15, CTSIE); | |
517 | write_scc(priv, R0, RES_EXT_INT); | |
518 | write_scc(priv, R1, EXT_INT_ENAB); | |
519 | } | |
520 | ||
521 | /* Start timer */ | |
522 | outb(1, tmr_base + TMR_CNT1); | |
523 | outb(0, tmr_base + TMR_CNT1); | |
524 | ||
525 | /* Wait and detect IRQ */ | |
526 | time = jiffies; | |
527 | while (jiffies - time < 2 + HZ / TMR_0_HZ); | |
528 | irq = probe_irq_off(irqs); | |
529 | ||
530 | /* Clear pending interrupt, disable interrupts */ | |
531 | if (type == TYPE_TWIN) { | |
532 | inb(card_base + TWIN_CLR_TMR1); | |
533 | } else { | |
534 | write_scc(priv, R1, 0); | |
535 | write_scc(priv, R15, 0); | |
536 | write_scc(priv, R0, RES_EXT_INT); | |
537 | } | |
538 | ||
539 | if (irq <= 0) { | |
540 | printk(KERN_ERR | |
541 | "dmascc: could not find irq of %s at %#3x (irq=%d)\n", | |
542 | hw[type].name, card_base, irq); | |
37ace20a | 543 | err = -ENODEV; |
1da177e4 LT |
544 | goto out3; |
545 | } | |
546 | ||
547 | /* Set up data structures */ | |
548 | for (i = 0; i < 2; i++) { | |
549 | dev = info->dev[i]; | |
550 | priv = &info->priv[i]; | |
551 | priv->type = type; | |
552 | priv->chip = chip; | |
553 | priv->dev = dev; | |
554 | priv->info = info; | |
555 | priv->channel = i; | |
556 | spin_lock_init(&priv->ring_lock); | |
557 | priv->register_lock = &info->register_lock; | |
558 | priv->card_base = card_base; | |
559 | priv->scc_cmd = scc_base + (i ? SCCB_CMD : SCCA_CMD); | |
560 | priv->scc_data = scc_base + (i ? SCCB_DATA : SCCA_DATA); | |
561 | priv->tmr_cnt = tmr_base + (i ? TMR_CNT2 : TMR_CNT1); | |
562 | priv->tmr_ctrl = tmr_base + TMR_CTRL; | |
563 | priv->tmr_mode = i ? 0xb0 : 0x70; | |
564 | priv->param.pclk_hz = hw[type].pclk_hz; | |
565 | priv->param.brg_tc = -1; | |
566 | priv->param.clocks = TCTRxCP | RCRTxCP; | |
567 | priv->param.persist = 256; | |
568 | priv->param.dma = -1; | |
7a87b6c2 | 569 | INIT_WORK(&priv->rx_work, rx_bh); |
f4bdd264 | 570 | dev->ml_priv = priv; |
9877e105 | 571 | snprintf(dev->name, sizeof(dev->name), "dmascc%i", 2 * n + i); |
1da177e4 LT |
572 | dev->base_addr = card_base; |
573 | dev->irq = irq; | |
52db6250 | 574 | dev->netdev_ops = &scc_netdev_ops; |
3b04ddde | 575 | dev->header_ops = &ax25_header_ops; |
1da177e4 LT |
576 | } |
577 | if (register_netdev(info->dev[0])) { | |
578 | printk(KERN_ERR "dmascc: could not register %s\n", | |
579 | info->dev[0]->name); | |
37ace20a | 580 | err = -ENODEV; |
1da177e4 LT |
581 | goto out3; |
582 | } | |
583 | if (register_netdev(info->dev[1])) { | |
584 | printk(KERN_ERR "dmascc: could not register %s\n", | |
585 | info->dev[1]->name); | |
37ace20a | 586 | err = -ENODEV; |
1da177e4 LT |
587 | goto out4; |
588 | } | |
589 | ||
590 | ||
591 | info->next = first; | |
592 | first = info; | |
593 | printk(KERN_INFO "dmascc: found %s (%s) at %#3x, irq %d\n", | |
594 | hw[type].name, chipnames[chip], card_base, irq); | |
595 | return 0; | |
596 | ||
597 | out4: | |
598 | unregister_netdev(info->dev[0]); | |
599 | out3: | |
600 | if (info->priv[0].type == TYPE_TWIN) | |
601 | outb(0, info->dev[0]->base_addr + TWIN_SERIAL_CFG); | |
602 | write_scc(&info->priv[0], R9, FHWRES); | |
603 | free_netdev(info->dev[1]); | |
604 | out2: | |
605 | free_netdev(info->dev[0]); | |
606 | out1: | |
607 | kfree(info); | |
608 | out: | |
37ace20a | 609 | return err; |
1da177e4 LT |
610 | } |
611 | ||
612 | ||
613 | /* Driver functions */ | |
614 | ||
615 | static void write_scc(struct scc_priv *priv, int reg, int val) | |
616 | { | |
617 | unsigned long flags; | |
618 | switch (priv->type) { | |
619 | case TYPE_S5: | |
620 | if (reg) | |
621 | outb(reg, priv->scc_cmd); | |
622 | outb(val, priv->scc_cmd); | |
623 | return; | |
624 | case TYPE_TWIN: | |
625 | if (reg) | |
626 | outb_p(reg, priv->scc_cmd); | |
627 | outb_p(val, priv->scc_cmd); | |
628 | return; | |
629 | default: | |
630 | spin_lock_irqsave(priv->register_lock, flags); | |
631 | outb_p(0, priv->card_base + PI_DREQ_MASK); | |
632 | if (reg) | |
633 | outb_p(reg, priv->scc_cmd); | |
634 | outb_p(val, priv->scc_cmd); | |
635 | outb(1, priv->card_base + PI_DREQ_MASK); | |
636 | spin_unlock_irqrestore(priv->register_lock, flags); | |
637 | return; | |
638 | } | |
639 | } | |
640 | ||
641 | ||
642 | static void write_scc_data(struct scc_priv *priv, int val, int fast) | |
643 | { | |
644 | unsigned long flags; | |
645 | switch (priv->type) { | |
646 | case TYPE_S5: | |
647 | outb(val, priv->scc_data); | |
648 | return; | |
649 | case TYPE_TWIN: | |
650 | outb_p(val, priv->scc_data); | |
651 | return; | |
652 | default: | |
653 | if (fast) | |
654 | outb_p(val, priv->scc_data); | |
655 | else { | |
656 | spin_lock_irqsave(priv->register_lock, flags); | |
657 | outb_p(0, priv->card_base + PI_DREQ_MASK); | |
658 | outb_p(val, priv->scc_data); | |
659 | outb(1, priv->card_base + PI_DREQ_MASK); | |
660 | spin_unlock_irqrestore(priv->register_lock, flags); | |
661 | } | |
662 | return; | |
663 | } | |
664 | } | |
665 | ||
666 | ||
667 | static int read_scc(struct scc_priv *priv, int reg) | |
668 | { | |
669 | int rc; | |
670 | unsigned long flags; | |
671 | switch (priv->type) { | |
672 | case TYPE_S5: | |
673 | if (reg) | |
674 | outb(reg, priv->scc_cmd); | |
675 | return inb(priv->scc_cmd); | |
676 | case TYPE_TWIN: | |
677 | if (reg) | |
678 | outb_p(reg, priv->scc_cmd); | |
679 | return inb_p(priv->scc_cmd); | |
680 | default: | |
681 | spin_lock_irqsave(priv->register_lock, flags); | |
682 | outb_p(0, priv->card_base + PI_DREQ_MASK); | |
683 | if (reg) | |
684 | outb_p(reg, priv->scc_cmd); | |
685 | rc = inb_p(priv->scc_cmd); | |
686 | outb(1, priv->card_base + PI_DREQ_MASK); | |
687 | spin_unlock_irqrestore(priv->register_lock, flags); | |
688 | return rc; | |
689 | } | |
690 | } | |
691 | ||
692 | ||
693 | static int read_scc_data(struct scc_priv *priv) | |
694 | { | |
695 | int rc; | |
696 | unsigned long flags; | |
697 | switch (priv->type) { | |
698 | case TYPE_S5: | |
699 | return inb(priv->scc_data); | |
700 | case TYPE_TWIN: | |
701 | return inb_p(priv->scc_data); | |
702 | default: | |
703 | spin_lock_irqsave(priv->register_lock, flags); | |
704 | outb_p(0, priv->card_base + PI_DREQ_MASK); | |
705 | rc = inb_p(priv->scc_data); | |
706 | outb(1, priv->card_base + PI_DREQ_MASK); | |
707 | spin_unlock_irqrestore(priv->register_lock, flags); | |
708 | return rc; | |
709 | } | |
710 | } | |
711 | ||
712 | ||
713 | static int scc_open(struct net_device *dev) | |
714 | { | |
f4bdd264 | 715 | struct scc_priv *priv = dev->ml_priv; |
1da177e4 LT |
716 | struct scc_info *info = priv->info; |
717 | int card_base = priv->card_base; | |
718 | ||
719 | /* Request IRQ if not already used by other channel */ | |
720 | if (!info->irq_used) { | |
721 | if (request_irq(dev->irq, scc_isr, 0, "dmascc", info)) { | |
722 | return -EAGAIN; | |
723 | } | |
724 | } | |
725 | info->irq_used++; | |
726 | ||
727 | /* Request DMA if required */ | |
728 | if (priv->param.dma >= 0) { | |
729 | if (request_dma(priv->param.dma, "dmascc")) { | |
730 | if (--info->irq_used == 0) | |
731 | free_irq(dev->irq, info); | |
732 | return -EAGAIN; | |
733 | } else { | |
734 | unsigned long flags = claim_dma_lock(); | |
735 | clear_dma_ff(priv->param.dma); | |
736 | release_dma_lock(flags); | |
737 | } | |
738 | } | |
739 | ||
740 | /* Initialize local variables */ | |
741 | priv->rx_ptr = 0; | |
742 | priv->rx_over = 0; | |
743 | priv->rx_head = priv->rx_tail = priv->rx_count = 0; | |
744 | priv->state = IDLE; | |
745 | priv->tx_head = priv->tx_tail = priv->tx_count = 0; | |
746 | priv->tx_ptr = 0; | |
747 | ||
748 | /* Reset channel */ | |
749 | write_scc(priv, R9, (priv->channel ? CHRB : CHRA) | MIE | NV); | |
750 | /* X1 clock, SDLC mode */ | |
751 | write_scc(priv, R4, SDLC | X1CLK); | |
752 | /* DMA */ | |
753 | write_scc(priv, R1, EXT_INT_ENAB | WT_FN_RDYFN); | |
754 | /* 8 bit RX char, RX disable */ | |
755 | write_scc(priv, R3, Rx8); | |
756 | /* 8 bit TX char, TX disable */ | |
757 | write_scc(priv, R5, Tx8); | |
758 | /* SDLC address field */ | |
759 | write_scc(priv, R6, 0); | |
760 | /* SDLC flag */ | |
761 | write_scc(priv, R7, FLAG); | |
762 | switch (priv->chip) { | |
763 | case Z85C30: | |
764 | /* Select WR7' */ | |
765 | write_scc(priv, R15, SHDLCE); | |
766 | /* Auto EOM reset */ | |
767 | write_scc(priv, R7, AUTOEOM); | |
768 | write_scc(priv, R15, 0); | |
769 | break; | |
770 | case Z85230: | |
771 | /* Select WR7' */ | |
772 | write_scc(priv, R15, SHDLCE); | |
773 | /* The following bits are set (see 2.5.2.1): | |
774 | - Automatic EOM reset | |
775 | - Interrupt request if RX FIFO is half full | |
776 | This bit should be ignored in DMA mode (according to the | |
777 | documentation), but actually isn't. The receiver doesn't work if | |
778 | it is set. Thus, we have to clear it in DMA mode. | |
779 | - Interrupt/DMA request if TX FIFO is completely empty | |
780 | a) If set, the ESCC behaves as if it had no TX FIFO (Z85C30 | |
781 | compatibility). | |
782 | b) If cleared, DMA requests may follow each other very quickly, | |
783 | filling up the TX FIFO. | |
784 | Advantage: TX works even in case of high bus latency. | |
785 | Disadvantage: Edge-triggered DMA request circuitry may miss | |
786 | a request. No more data is delivered, resulting | |
787 | in a TX FIFO underrun. | |
788 | Both PI2 and S5SCC/DMA seem to work fine with TXFIFOE cleared. | |
789 | The PackeTwin doesn't. I don't know about the PI, but let's | |
790 | assume it behaves like the PI2. | |
791 | */ | |
792 | if (priv->param.dma >= 0) { | |
793 | if (priv->type == TYPE_TWIN) | |
794 | write_scc(priv, R7, AUTOEOM | TXFIFOE); | |
795 | else | |
796 | write_scc(priv, R7, AUTOEOM); | |
797 | } else { | |
798 | write_scc(priv, R7, AUTOEOM | RXFIFOH); | |
799 | } | |
800 | write_scc(priv, R15, 0); | |
801 | break; | |
802 | } | |
803 | /* Preset CRC, NRZ(I) encoding */ | |
804 | write_scc(priv, R10, CRCPS | (priv->param.nrzi ? NRZI : NRZ)); | |
805 | ||
806 | /* Configure baud rate generator */ | |
807 | if (priv->param.brg_tc >= 0) { | |
808 | /* Program BR generator */ | |
809 | write_scc(priv, R12, priv->param.brg_tc & 0xFF); | |
810 | write_scc(priv, R13, (priv->param.brg_tc >> 8) & 0xFF); | |
811 | /* BRG source = SYS CLK; enable BRG; DTR REQ function (required by | |
812 | PackeTwin, not connected on the PI2); set DPLL source to BRG */ | |
813 | write_scc(priv, R14, SSBR | DTRREQ | BRSRC | BRENABL); | |
814 | /* Enable DPLL */ | |
815 | write_scc(priv, R14, SEARCH | DTRREQ | BRSRC | BRENABL); | |
816 | } else { | |
817 | /* Disable BR generator */ | |
818 | write_scc(priv, R14, DTRREQ | BRSRC); | |
819 | } | |
820 | ||
821 | /* Configure clocks */ | |
822 | if (priv->type == TYPE_TWIN) { | |
823 | /* Disable external TX clock receiver */ | |
824 | outb((info->twin_serial_cfg &= | |
825 | ~(priv->channel ? TWIN_EXTCLKB : TWIN_EXTCLKA)), | |
826 | card_base + TWIN_SERIAL_CFG); | |
827 | } | |
828 | write_scc(priv, R11, priv->param.clocks); | |
829 | if ((priv->type == TYPE_TWIN) && !(priv->param.clocks & TRxCOI)) { | |
830 | /* Enable external TX clock receiver */ | |
831 | outb((info->twin_serial_cfg |= | |
832 | (priv->channel ? TWIN_EXTCLKB : TWIN_EXTCLKA)), | |
833 | card_base + TWIN_SERIAL_CFG); | |
834 | } | |
835 | ||
836 | /* Configure PackeTwin */ | |
837 | if (priv->type == TYPE_TWIN) { | |
838 | /* Assert DTR, enable interrupts */ | |
839 | outb((info->twin_serial_cfg |= TWIN_EI | | |
840 | (priv->channel ? TWIN_DTRB_ON : TWIN_DTRA_ON)), | |
841 | card_base + TWIN_SERIAL_CFG); | |
842 | } | |
843 | ||
844 | /* Read current status */ | |
845 | priv->rr0 = read_scc(priv, R0); | |
846 | /* Enable DCD interrupt */ | |
847 | write_scc(priv, R15, DCDIE); | |
848 | ||
849 | netif_start_queue(dev); | |
850 | ||
851 | return 0; | |
852 | } | |
853 | ||
854 | ||
855 | static int scc_close(struct net_device *dev) | |
856 | { | |
f4bdd264 | 857 | struct scc_priv *priv = dev->ml_priv; |
1da177e4 LT |
858 | struct scc_info *info = priv->info; |
859 | int card_base = priv->card_base; | |
860 | ||
861 | netif_stop_queue(dev); | |
862 | ||
863 | if (priv->type == TYPE_TWIN) { | |
864 | /* Drop DTR */ | |
865 | outb((info->twin_serial_cfg &= | |
866 | (priv->channel ? ~TWIN_DTRB_ON : ~TWIN_DTRA_ON)), | |
867 | card_base + TWIN_SERIAL_CFG); | |
868 | } | |
869 | ||
870 | /* Reset channel, free DMA and IRQ */ | |
871 | write_scc(priv, R9, (priv->channel ? CHRB : CHRA) | MIE | NV); | |
872 | if (priv->param.dma >= 0) { | |
873 | if (priv->type == TYPE_TWIN) | |
874 | outb(0, card_base + TWIN_DMA_CFG); | |
875 | free_dma(priv->param.dma); | |
876 | } | |
877 | if (--info->irq_used == 0) | |
878 | free_irq(dev->irq, info); | |
879 | ||
880 | return 0; | |
881 | } | |
882 | ||
883 | ||
884 | static int scc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
885 | { | |
f4bdd264 | 886 | struct scc_priv *priv = dev->ml_priv; |
1da177e4 LT |
887 | |
888 | switch (cmd) { | |
889 | case SIOCGSCCPARAM: | |
890 | if (copy_to_user | |
891 | (ifr->ifr_data, &priv->param, | |
892 | sizeof(struct scc_param))) | |
893 | return -EFAULT; | |
894 | return 0; | |
895 | case SIOCSSCCPARAM: | |
896 | if (!capable(CAP_NET_ADMIN)) | |
897 | return -EPERM; | |
898 | if (netif_running(dev)) | |
899 | return -EAGAIN; | |
900 | if (copy_from_user | |
901 | (&priv->param, ifr->ifr_data, | |
902 | sizeof(struct scc_param))) | |
903 | return -EFAULT; | |
904 | return 0; | |
905 | default: | |
906 | return -EINVAL; | |
907 | } | |
908 | } | |
909 | ||
910 | ||
911 | static int scc_send_packet(struct sk_buff *skb, struct net_device *dev) | |
912 | { | |
f4bdd264 | 913 | struct scc_priv *priv = dev->ml_priv; |
1da177e4 LT |
914 | unsigned long flags; |
915 | int i; | |
916 | ||
1d5da757 EB |
917 | if (skb->protocol == htons(ETH_P_IP)) |
918 | return ax25_ip_xmit(skb); | |
919 | ||
1da177e4 LT |
920 | /* Temporarily stop the scheduler feeding us packets */ |
921 | netif_stop_queue(dev); | |
922 | ||
923 | /* Transfer data to DMA buffer */ | |
924 | i = priv->tx_head; | |
d626f62b | 925 | skb_copy_from_linear_data_offset(skb, 1, priv->tx_buf[i], skb->len - 1); |
1da177e4 LT |
926 | priv->tx_len[i] = skb->len - 1; |
927 | ||
928 | /* Clear interrupts while we touch our circular buffers */ | |
929 | ||
930 | spin_lock_irqsave(&priv->ring_lock, flags); | |
931 | /* Move the ring buffer's head */ | |
932 | priv->tx_head = (i + 1) % NUM_TX_BUF; | |
933 | priv->tx_count++; | |
934 | ||
935 | /* If we just filled up the last buffer, leave queue stopped. | |
936 | The higher layers must wait until we have a DMA buffer | |
937 | to accept the data. */ | |
938 | if (priv->tx_count < NUM_TX_BUF) | |
939 | netif_wake_queue(dev); | |
940 | ||
941 | /* Set new TX state */ | |
942 | if (priv->state == IDLE) { | |
943 | /* Assert RTS, start timer */ | |
944 | priv->state = TX_HEAD; | |
945 | priv->tx_start = jiffies; | |
946 | write_scc(priv, R5, TxCRC_ENAB | RTS | TxENAB | Tx8); | |
947 | write_scc(priv, R15, 0); | |
948 | start_timer(priv, priv->param.txdelay, 0); | |
949 | } | |
950 | ||
951 | /* Turn interrupts back on and free buffer */ | |
952 | spin_unlock_irqrestore(&priv->ring_lock, flags); | |
953 | dev_kfree_skb(skb); | |
954 | ||
6ed10654 | 955 | return NETDEV_TX_OK; |
1da177e4 LT |
956 | } |
957 | ||
958 | ||
1da177e4 LT |
959 | static int scc_set_mac_address(struct net_device *dev, void *sa) |
960 | { | |
961 | memcpy(dev->dev_addr, ((struct sockaddr *) sa)->sa_data, | |
962 | dev->addr_len); | |
963 | return 0; | |
964 | } | |
965 | ||
966 | ||
967 | static inline void tx_on(struct scc_priv *priv) | |
968 | { | |
969 | int i, n; | |
970 | unsigned long flags; | |
971 | ||
972 | if (priv->param.dma >= 0) { | |
973 | n = (priv->chip == Z85230) ? 3 : 1; | |
974 | /* Program DMA controller */ | |
975 | flags = claim_dma_lock(); | |
976 | set_dma_mode(priv->param.dma, DMA_MODE_WRITE); | |
977 | set_dma_addr(priv->param.dma, | |
978 | (int) priv->tx_buf[priv->tx_tail] + n); | |
979 | set_dma_count(priv->param.dma, | |
980 | priv->tx_len[priv->tx_tail] - n); | |
981 | release_dma_lock(flags); | |
982 | /* Enable TX underrun interrupt */ | |
983 | write_scc(priv, R15, TxUIE); | |
984 | /* Configure DREQ */ | |
985 | if (priv->type == TYPE_TWIN) | |
986 | outb((priv->param.dma == | |
987 | 1) ? TWIN_DMA_HDX_T1 : TWIN_DMA_HDX_T3, | |
988 | priv->card_base + TWIN_DMA_CFG); | |
989 | else | |
990 | write_scc(priv, R1, | |
991 | EXT_INT_ENAB | WT_FN_RDYFN | | |
992 | WT_RDY_ENAB); | |
993 | /* Write first byte(s) */ | |
994 | spin_lock_irqsave(priv->register_lock, flags); | |
995 | for (i = 0; i < n; i++) | |
996 | write_scc_data(priv, | |
997 | priv->tx_buf[priv->tx_tail][i], 1); | |
998 | enable_dma(priv->param.dma); | |
999 | spin_unlock_irqrestore(priv->register_lock, flags); | |
1000 | } else { | |
1001 | write_scc(priv, R15, TxUIE); | |
1002 | write_scc(priv, R1, | |
1003 | EXT_INT_ENAB | WT_FN_RDYFN | TxINT_ENAB); | |
1004 | tx_isr(priv); | |
1005 | } | |
1006 | /* Reset EOM latch if we do not have the AUTOEOM feature */ | |
1007 | if (priv->chip == Z8530) | |
1008 | write_scc(priv, R0, RES_EOM_L); | |
1009 | } | |
1010 | ||
1011 | ||
1012 | static inline void rx_on(struct scc_priv *priv) | |
1013 | { | |
1014 | unsigned long flags; | |
1015 | ||
1016 | /* Clear RX FIFO */ | |
1017 | while (read_scc(priv, R0) & Rx_CH_AV) | |
1018 | read_scc_data(priv); | |
1019 | priv->rx_over = 0; | |
1020 | if (priv->param.dma >= 0) { | |
1021 | /* Program DMA controller */ | |
1022 | flags = claim_dma_lock(); | |
1023 | set_dma_mode(priv->param.dma, DMA_MODE_READ); | |
1024 | set_dma_addr(priv->param.dma, | |
1025 | (int) priv->rx_buf[priv->rx_head]); | |
1026 | set_dma_count(priv->param.dma, BUF_SIZE); | |
1027 | release_dma_lock(flags); | |
1028 | enable_dma(priv->param.dma); | |
1029 | /* Configure PackeTwin DMA */ | |
1030 | if (priv->type == TYPE_TWIN) { | |
1031 | outb((priv->param.dma == | |
1032 | 1) ? TWIN_DMA_HDX_R1 : TWIN_DMA_HDX_R3, | |
1033 | priv->card_base + TWIN_DMA_CFG); | |
1034 | } | |
1035 | /* Sp. cond. intr. only, ext int enable, RX DMA enable */ | |
1036 | write_scc(priv, R1, EXT_INT_ENAB | INT_ERR_Rx | | |
1037 | WT_RDY_RT | WT_FN_RDYFN | WT_RDY_ENAB); | |
1038 | } else { | |
1039 | /* Reset current frame */ | |
1040 | priv->rx_ptr = 0; | |
1041 | /* Intr. on all Rx characters and Sp. cond., ext int enable */ | |
1042 | write_scc(priv, R1, EXT_INT_ENAB | INT_ALL_Rx | WT_RDY_RT | | |
1043 | WT_FN_RDYFN); | |
1044 | } | |
1045 | write_scc(priv, R0, ERR_RES); | |
1046 | write_scc(priv, R3, RxENABLE | Rx8 | RxCRC_ENAB); | |
1047 | } | |
1048 | ||
1049 | ||
1050 | static inline void rx_off(struct scc_priv *priv) | |
1051 | { | |
1052 | /* Disable receiver */ | |
1053 | write_scc(priv, R3, Rx8); | |
1054 | /* Disable DREQ / RX interrupt */ | |
1055 | if (priv->param.dma >= 0 && priv->type == TYPE_TWIN) | |
1056 | outb(0, priv->card_base + TWIN_DMA_CFG); | |
1057 | else | |
1058 | write_scc(priv, R1, EXT_INT_ENAB | WT_FN_RDYFN); | |
1059 | /* Disable DMA */ | |
1060 | if (priv->param.dma >= 0) | |
1061 | disable_dma(priv->param.dma); | |
1062 | } | |
1063 | ||
1064 | ||
1065 | static void start_timer(struct scc_priv *priv, int t, int r15) | |
1066 | { | |
1da177e4 LT |
1067 | outb(priv->tmr_mode, priv->tmr_ctrl); |
1068 | if (t == 0) { | |
1069 | tm_isr(priv); | |
1070 | } else if (t > 0) { | |
1da177e4 LT |
1071 | outb(t & 0xFF, priv->tmr_cnt); |
1072 | outb((t >> 8) & 0xFF, priv->tmr_cnt); | |
1073 | if (priv->type != TYPE_TWIN) { | |
1074 | write_scc(priv, R15, r15 | CTSIE); | |
1075 | priv->rr0 |= CTS; | |
1076 | } | |
1da177e4 LT |
1077 | } |
1078 | } | |
1079 | ||
1080 | ||
1081 | static inline unsigned char random(void) | |
1082 | { | |
1083 | /* See "Numerical Recipes in C", second edition, p. 284 */ | |
1084 | rand = rand * 1664525L + 1013904223L; | |
1085 | return (unsigned char) (rand >> 24); | |
1086 | } | |
1087 | ||
1088 | static inline void z8530_isr(struct scc_info *info) | |
1089 | { | |
1090 | int is, i = 100; | |
1091 | ||
1092 | while ((is = read_scc(&info->priv[0], R3)) && i--) { | |
1093 | if (is & CHARxIP) { | |
1094 | rx_isr(&info->priv[0]); | |
1095 | } else if (is & CHATxIP) { | |
1096 | tx_isr(&info->priv[0]); | |
1097 | } else if (is & CHAEXT) { | |
1098 | es_isr(&info->priv[0]); | |
1099 | } else if (is & CHBRxIP) { | |
1100 | rx_isr(&info->priv[1]); | |
1101 | } else if (is & CHBTxIP) { | |
1102 | tx_isr(&info->priv[1]); | |
1103 | } else { | |
1104 | es_isr(&info->priv[1]); | |
1105 | } | |
1106 | write_scc(&info->priv[0], R0, RES_H_IUS); | |
1107 | i++; | |
1108 | } | |
1109 | if (i < 0) { | |
1110 | printk(KERN_ERR "dmascc: stuck in ISR with RR3=0x%02x.\n", | |
1111 | is); | |
1112 | } | |
1113 | /* Ok, no interrupts pending from this 8530. The INT line should | |
1114 | be inactive now. */ | |
1115 | } | |
1116 | ||
1117 | ||
7d12e780 | 1118 | static irqreturn_t scc_isr(int irq, void *dev_id) |
1da177e4 LT |
1119 | { |
1120 | struct scc_info *info = dev_id; | |
1121 | ||
1122 | spin_lock(info->priv[0].register_lock); | |
1123 | /* At this point interrupts are enabled, and the interrupt under service | |
1124 | is already acknowledged, but masked off. | |
1125 | ||
1126 | Interrupt processing: We loop until we know that the IRQ line is | |
1127 | low. If another positive edge occurs afterwards during the ISR, | |
1128 | another interrupt will be triggered by the interrupt controller | |
1129 | as soon as the IRQ level is enabled again (see asm/irq.h). | |
1130 | ||
1131 | Bottom-half handlers will be processed after scc_isr(). This is | |
1132 | important, since we only have small ringbuffers and want new data | |
1133 | to be fetched/delivered immediately. */ | |
1134 | ||
1135 | if (info->priv[0].type == TYPE_TWIN) { | |
1136 | int is, card_base = info->priv[0].card_base; | |
1137 | while ((is = ~inb(card_base + TWIN_INT_REG)) & | |
1138 | TWIN_INT_MSK) { | |
1139 | if (is & TWIN_SCC_MSK) { | |
1140 | z8530_isr(info); | |
1141 | } else if (is & TWIN_TMR1_MSK) { | |
1142 | inb(card_base + TWIN_CLR_TMR1); | |
1143 | tm_isr(&info->priv[0]); | |
1144 | } else { | |
1145 | inb(card_base + TWIN_CLR_TMR2); | |
1146 | tm_isr(&info->priv[1]); | |
1147 | } | |
1148 | } | |
1149 | } else | |
1150 | z8530_isr(info); | |
1151 | spin_unlock(info->priv[0].register_lock); | |
1152 | return IRQ_HANDLED; | |
1153 | } | |
1154 | ||
1155 | ||
1156 | static void rx_isr(struct scc_priv *priv) | |
1157 | { | |
1158 | if (priv->param.dma >= 0) { | |
1159 | /* Check special condition and perform error reset. See 2.4.7.5. */ | |
1160 | special_condition(priv, read_scc(priv, R1)); | |
1161 | write_scc(priv, R0, ERR_RES); | |
1162 | } else { | |
1163 | /* Check special condition for each character. Error reset not necessary. | |
1164 | Same algorithm for SCC and ESCC. See 2.4.7.1 and 2.4.7.4. */ | |
1165 | int rc; | |
1166 | while (read_scc(priv, R0) & Rx_CH_AV) { | |
1167 | rc = read_scc(priv, R1); | |
1168 | if (priv->rx_ptr < BUF_SIZE) | |
1169 | priv->rx_buf[priv->rx_head][priv-> | |
1170 | rx_ptr++] = | |
1171 | read_scc_data(priv); | |
1172 | else { | |
1173 | priv->rx_over = 2; | |
1174 | read_scc_data(priv); | |
1175 | } | |
1176 | special_condition(priv, rc); | |
1177 | } | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | ||
1182 | static void special_condition(struct scc_priv *priv, int rc) | |
1183 | { | |
1184 | int cb; | |
1185 | unsigned long flags; | |
1186 | ||
1187 | /* See Figure 2-15. Only overrun and EOF need to be checked. */ | |
1188 | ||
1189 | if (rc & Rx_OVR) { | |
1190 | /* Receiver overrun */ | |
1191 | priv->rx_over = 1; | |
1192 | if (priv->param.dma < 0) | |
1193 | write_scc(priv, R0, ERR_RES); | |
1194 | } else if (rc & END_FR) { | |
1195 | /* End of frame. Get byte count */ | |
1196 | if (priv->param.dma >= 0) { | |
1197 | flags = claim_dma_lock(); | |
1198 | cb = BUF_SIZE - get_dma_residue(priv->param.dma) - | |
1199 | 2; | |
1200 | release_dma_lock(flags); | |
1201 | } else { | |
1202 | cb = priv->rx_ptr - 2; | |
1203 | } | |
1204 | if (priv->rx_over) { | |
1205 | /* We had an overrun */ | |
13c0582d | 1206 | priv->dev->stats.rx_errors++; |
1da177e4 | 1207 | if (priv->rx_over == 2) |
13c0582d | 1208 | priv->dev->stats.rx_length_errors++; |
1da177e4 | 1209 | else |
13c0582d | 1210 | priv->dev->stats.rx_fifo_errors++; |
1da177e4 LT |
1211 | priv->rx_over = 0; |
1212 | } else if (rc & CRC_ERR) { | |
1213 | /* Count invalid CRC only if packet length >= minimum */ | |
1214 | if (cb >= 15) { | |
13c0582d SH |
1215 | priv->dev->stats.rx_errors++; |
1216 | priv->dev->stats.rx_crc_errors++; | |
1da177e4 LT |
1217 | } |
1218 | } else { | |
1219 | if (cb >= 15) { | |
1220 | if (priv->rx_count < NUM_RX_BUF - 1) { | |
1221 | /* Put good frame in FIFO */ | |
1222 | priv->rx_len[priv->rx_head] = cb; | |
1223 | priv->rx_head = | |
1224 | (priv->rx_head + | |
1225 | 1) % NUM_RX_BUF; | |
1226 | priv->rx_count++; | |
1227 | schedule_work(&priv->rx_work); | |
1228 | } else { | |
13c0582d SH |
1229 | priv->dev->stats.rx_errors++; |
1230 | priv->dev->stats.rx_over_errors++; | |
1da177e4 LT |
1231 | } |
1232 | } | |
1233 | } | |
1234 | /* Get ready for new frame */ | |
1235 | if (priv->param.dma >= 0) { | |
1236 | flags = claim_dma_lock(); | |
1237 | set_dma_addr(priv->param.dma, | |
1238 | (int) priv->rx_buf[priv->rx_head]); | |
1239 | set_dma_count(priv->param.dma, BUF_SIZE); | |
1240 | release_dma_lock(flags); | |
1241 | } else { | |
1242 | priv->rx_ptr = 0; | |
1243 | } | |
1244 | } | |
1245 | } | |
1246 | ||
1247 | ||
7a87b6c2 | 1248 | static void rx_bh(struct work_struct *ugli_api) |
1da177e4 | 1249 | { |
7a87b6c2 | 1250 | struct scc_priv *priv = container_of(ugli_api, struct scc_priv, rx_work); |
1da177e4 LT |
1251 | int i = priv->rx_tail; |
1252 | int cb; | |
1253 | unsigned long flags; | |
1254 | struct sk_buff *skb; | |
1255 | unsigned char *data; | |
1256 | ||
1257 | spin_lock_irqsave(&priv->ring_lock, flags); | |
1258 | while (priv->rx_count) { | |
1259 | spin_unlock_irqrestore(&priv->ring_lock, flags); | |
1260 | cb = priv->rx_len[i]; | |
1261 | /* Allocate buffer */ | |
1262 | skb = dev_alloc_skb(cb + 1); | |
1263 | if (skb == NULL) { | |
1264 | /* Drop packet */ | |
13c0582d | 1265 | priv->dev->stats.rx_dropped++; |
1da177e4 LT |
1266 | } else { |
1267 | /* Fill buffer */ | |
1268 | data = skb_put(skb, cb + 1); | |
1269 | data[0] = 0; | |
1270 | memcpy(&data[1], priv->rx_buf[i], cb); | |
56cb5156 | 1271 | skb->protocol = ax25_type_trans(skb, priv->dev); |
1da177e4 | 1272 | netif_rx(skb); |
13c0582d SH |
1273 | priv->dev->stats.rx_packets++; |
1274 | priv->dev->stats.rx_bytes += cb; | |
1da177e4 LT |
1275 | } |
1276 | spin_lock_irqsave(&priv->ring_lock, flags); | |
1277 | /* Move tail */ | |
1278 | priv->rx_tail = i = (i + 1) % NUM_RX_BUF; | |
1279 | priv->rx_count--; | |
1280 | } | |
1281 | spin_unlock_irqrestore(&priv->ring_lock, flags); | |
1282 | } | |
1283 | ||
1284 | ||
1285 | static void tx_isr(struct scc_priv *priv) | |
1286 | { | |
1287 | int i = priv->tx_tail, p = priv->tx_ptr; | |
1288 | ||
1289 | /* Suspend TX interrupts if we don't want to send anything. | |
1290 | See Figure 2-22. */ | |
1291 | if (p == priv->tx_len[i]) { | |
1292 | write_scc(priv, R0, RES_Tx_P); | |
1293 | return; | |
1294 | } | |
1295 | ||
1296 | /* Write characters */ | |
1297 | while ((read_scc(priv, R0) & Tx_BUF_EMP) && p < priv->tx_len[i]) { | |
1298 | write_scc_data(priv, priv->tx_buf[i][p++], 0); | |
1299 | } | |
1300 | ||
1301 | /* Reset EOM latch of Z8530 */ | |
1302 | if (!priv->tx_ptr && p && priv->chip == Z8530) | |
1303 | write_scc(priv, R0, RES_EOM_L); | |
1304 | ||
1305 | priv->tx_ptr = p; | |
1306 | } | |
1307 | ||
1308 | ||
1309 | static void es_isr(struct scc_priv *priv) | |
1310 | { | |
1311 | int i, rr0, drr0, res; | |
1312 | unsigned long flags; | |
1313 | ||
1314 | /* Read status, reset interrupt bit (open latches) */ | |
1315 | rr0 = read_scc(priv, R0); | |
1316 | write_scc(priv, R0, RES_EXT_INT); | |
1317 | drr0 = priv->rr0 ^ rr0; | |
1318 | priv->rr0 = rr0; | |
1319 | ||
1320 | /* Transmit underrun (2.4.9.6). We can't check the TxEOM flag, since | |
1321 | it might have already been cleared again by AUTOEOM. */ | |
1322 | if (priv->state == TX_DATA) { | |
1323 | /* Get remaining bytes */ | |
1324 | i = priv->tx_tail; | |
1325 | if (priv->param.dma >= 0) { | |
1326 | disable_dma(priv->param.dma); | |
1327 | flags = claim_dma_lock(); | |
1328 | res = get_dma_residue(priv->param.dma); | |
1329 | release_dma_lock(flags); | |
1330 | } else { | |
1331 | res = priv->tx_len[i] - priv->tx_ptr; | |
1332 | priv->tx_ptr = 0; | |
1333 | } | |
1334 | /* Disable DREQ / TX interrupt */ | |
1335 | if (priv->param.dma >= 0 && priv->type == TYPE_TWIN) | |
1336 | outb(0, priv->card_base + TWIN_DMA_CFG); | |
1337 | else | |
1338 | write_scc(priv, R1, EXT_INT_ENAB | WT_FN_RDYFN); | |
1339 | if (res) { | |
1340 | /* Update packet statistics */ | |
13c0582d SH |
1341 | priv->dev->stats.tx_errors++; |
1342 | priv->dev->stats.tx_fifo_errors++; | |
1da177e4 LT |
1343 | /* Other underrun interrupts may already be waiting */ |
1344 | write_scc(priv, R0, RES_EXT_INT); | |
1345 | write_scc(priv, R0, RES_EXT_INT); | |
1346 | } else { | |
1347 | /* Update packet statistics */ | |
13c0582d SH |
1348 | priv->dev->stats.tx_packets++; |
1349 | priv->dev->stats.tx_bytes += priv->tx_len[i]; | |
1da177e4 LT |
1350 | /* Remove frame from FIFO */ |
1351 | priv->tx_tail = (i + 1) % NUM_TX_BUF; | |
1352 | priv->tx_count--; | |
1353 | /* Inform upper layers */ | |
1354 | netif_wake_queue(priv->dev); | |
1355 | } | |
1356 | /* Switch state */ | |
1357 | write_scc(priv, R15, 0); | |
1358 | if (priv->tx_count && | |
1359 | (jiffies - priv->tx_start) < priv->param.txtimeout) { | |
1360 | priv->state = TX_PAUSE; | |
1361 | start_timer(priv, priv->param.txpause, 0); | |
1362 | } else { | |
1363 | priv->state = TX_TAIL; | |
1364 | start_timer(priv, priv->param.txtail, 0); | |
1365 | } | |
1366 | } | |
1367 | ||
1368 | /* DCD transition */ | |
1369 | if (drr0 & DCD) { | |
1370 | if (rr0 & DCD) { | |
1371 | switch (priv->state) { | |
1372 | case IDLE: | |
1373 | case WAIT: | |
1374 | priv->state = DCD_ON; | |
1375 | write_scc(priv, R15, 0); | |
1376 | start_timer(priv, priv->param.dcdon, 0); | |
1377 | } | |
1378 | } else { | |
1379 | switch (priv->state) { | |
1380 | case RX_ON: | |
1381 | rx_off(priv); | |
1382 | priv->state = DCD_OFF; | |
1383 | write_scc(priv, R15, 0); | |
1384 | start_timer(priv, priv->param.dcdoff, 0); | |
1385 | } | |
1386 | } | |
1387 | } | |
1388 | ||
1389 | /* CTS transition */ | |
1390 | if ((drr0 & CTS) && (~rr0 & CTS) && priv->type != TYPE_TWIN) | |
1391 | tm_isr(priv); | |
1392 | ||
1393 | } | |
1394 | ||
1395 | ||
1396 | static void tm_isr(struct scc_priv *priv) | |
1397 | { | |
1398 | switch (priv->state) { | |
1399 | case TX_HEAD: | |
1400 | case TX_PAUSE: | |
1401 | tx_on(priv); | |
1402 | priv->state = TX_DATA; | |
1403 | break; | |
1404 | case TX_TAIL: | |
1405 | write_scc(priv, R5, TxCRC_ENAB | Tx8); | |
1406 | priv->state = RTS_OFF; | |
1407 | if (priv->type != TYPE_TWIN) | |
1408 | write_scc(priv, R15, 0); | |
1409 | start_timer(priv, priv->param.rtsoff, 0); | |
1410 | break; | |
1411 | case RTS_OFF: | |
1412 | write_scc(priv, R15, DCDIE); | |
1413 | priv->rr0 = read_scc(priv, R0); | |
1414 | if (priv->rr0 & DCD) { | |
13c0582d | 1415 | priv->dev->stats.collisions++; |
1da177e4 LT |
1416 | rx_on(priv); |
1417 | priv->state = RX_ON; | |
1418 | } else { | |
1419 | priv->state = WAIT; | |
1420 | start_timer(priv, priv->param.waittime, DCDIE); | |
1421 | } | |
1422 | break; | |
1423 | case WAIT: | |
1424 | if (priv->tx_count) { | |
1425 | priv->state = TX_HEAD; | |
1426 | priv->tx_start = jiffies; | |
1427 | write_scc(priv, R5, | |
1428 | TxCRC_ENAB | RTS | TxENAB | Tx8); | |
1429 | write_scc(priv, R15, 0); | |
1430 | start_timer(priv, priv->param.txdelay, 0); | |
1431 | } else { | |
1432 | priv->state = IDLE; | |
1433 | if (priv->type != TYPE_TWIN) | |
1434 | write_scc(priv, R15, DCDIE); | |
1435 | } | |
1436 | break; | |
1437 | case DCD_ON: | |
1438 | case DCD_OFF: | |
1439 | write_scc(priv, R15, DCDIE); | |
1440 | priv->rr0 = read_scc(priv, R0); | |
1441 | if (priv->rr0 & DCD) { | |
1442 | rx_on(priv); | |
1443 | priv->state = RX_ON; | |
1444 | } else { | |
1445 | priv->state = WAIT; | |
1446 | start_timer(priv, | |
1447 | random() / priv->param.persist * | |
1448 | priv->param.slottime, DCDIE); | |
1449 | } | |
1450 | break; | |
1451 | } | |
1452 | } |