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Commit | Line | Data |
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51533b61 | 1 | /* |
e908dfc3 | 2 | * Simple synchronous serial port driver for ETRAX FS and Artpec-3. |
51533b61 MS |
3 | * |
4 | * Copyright (c) 2005 Axis Communications AB | |
5 | * | |
6 | * Author: Mikael Starvik | |
7 | * | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/kernel.h> | |
51533b61 MS |
12 | #include <linux/types.h> |
13 | #include <linux/errno.h> | |
14 | #include <linux/major.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/slab.h> | |
0c401df3 | 17 | #include <linux/smp_lock.h> |
51533b61 MS |
18 | #include <linux/interrupt.h> |
19 | #include <linux/poll.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/timer.h> | |
22 | #include <linux/spinlock.h> | |
23 | ||
24 | #include <asm/io.h> | |
e908dfc3 JN |
25 | #include <dma.h> |
26 | #include <pinmux.h> | |
27 | #include <hwregs/reg_rdwr.h> | |
28 | #include <hwregs/sser_defs.h> | |
29 | #include <hwregs/dma_defs.h> | |
30 | #include <hwregs/dma.h> | |
31 | #include <hwregs/intr_vect_defs.h> | |
32 | #include <hwregs/intr_vect.h> | |
33 | #include <hwregs/reg_map.h> | |
51533b61 MS |
34 | #include <asm/sync_serial.h> |
35 | ||
e908dfc3 | 36 | |
51533b61 MS |
37 | /* The receiver is a bit tricky beacuse of the continuous stream of data.*/ |
38 | /* */ | |
39 | /* Three DMA descriptors are linked together. Each DMA descriptor is */ | |
40 | /* responsible for port->bufchunk of a common buffer. */ | |
41 | /* */ | |
42 | /* +---------------------------------------------+ */ | |
43 | /* | +----------+ +----------+ +----------+ | */ | |
44 | /* +-> | Descr[0] |-->| Descr[1] |-->| Descr[2] |-+ */ | |
45 | /* +----------+ +----------+ +----------+ */ | |
46 | /* | | | */ | |
47 | /* v v v */ | |
48 | /* +-------------------------------------+ */ | |
49 | /* | BUFFER | */ | |
50 | /* +-------------------------------------+ */ | |
51 | /* |<- data_avail ->| */ | |
52 | /* readp writep */ | |
53 | /* */ | |
54 | /* If the application keeps up the pace readp will be right after writep.*/ | |
55 | /* If the application can't keep the pace we have to throw away data. */ | |
56 | /* The idea is that readp should be ready with the data pointed out by */ | |
57 | /* Descr[i] when the DMA has filled in Descr[i+1]. */ | |
58 | /* Otherwise we will discard */ | |
59 | /* the rest of the data pointed out by Descr1 and set readp to the start */ | |
60 | /* of Descr2 */ | |
61 | ||
62 | #define SYNC_SERIAL_MAJOR 125 | |
63 | ||
64 | /* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */ | |
65 | /* words can be handled */ | |
66 | #define IN_BUFFER_SIZE 12288 | |
67 | #define IN_DESCR_SIZE 256 | |
e908dfc3 JN |
68 | #define NBR_IN_DESCR (IN_BUFFER_SIZE/IN_DESCR_SIZE) |
69 | ||
70 | #define OUT_BUFFER_SIZE 1024*8 | |
71 | #define NBR_OUT_DESCR 8 | |
51533b61 MS |
72 | |
73 | #define DEFAULT_FRAME_RATE 0 | |
74 | #define DEFAULT_WORD_RATE 7 | |
75 | ||
76 | /* NOTE: Enabling some debug will likely cause overrun or underrun, | |
77 | * especially if manual mode is use. | |
78 | */ | |
79 | #define DEBUG(x) | |
80 | #define DEBUGREAD(x) | |
81 | #define DEBUGWRITE(x) | |
82 | #define DEBUGPOLL(x) | |
83 | #define DEBUGRXINT(x) | |
84 | #define DEBUGTXINT(x) | |
e908dfc3 JN |
85 | #define DEBUGTRDMA(x) |
86 | #define DEBUGOUTBUF(x) | |
51533b61 MS |
87 | |
88 | typedef struct sync_port | |
89 | { | |
90 | reg_scope_instances regi_sser; | |
91 | reg_scope_instances regi_dmain; | |
92 | reg_scope_instances regi_dmaout; | |
93 | ||
94 | char started; /* 1 if port has been started */ | |
95 | char port_nbr; /* Port 0 or 1 */ | |
96 | char busy; /* 1 if port is busy */ | |
97 | ||
98 | char enabled; /* 1 if port is enabled */ | |
99 | char use_dma; /* 1 if port uses dma */ | |
100 | char tr_running; | |
101 | ||
102 | char init_irqs; | |
103 | int output; | |
104 | int input; | |
105 | ||
e908dfc3 JN |
106 | /* Next byte to be read by application */ |
107 | volatile unsigned char *volatile readp; | |
108 | /* Next byte to be written by etrax */ | |
109 | volatile unsigned char *volatile writep; | |
110 | ||
51533b61 MS |
111 | unsigned int in_buffer_size; |
112 | unsigned int inbufchunk; | |
113 | unsigned char out_buffer[OUT_BUFFER_SIZE] __attribute__ ((aligned(32))); | |
114 | unsigned char in_buffer[IN_BUFFER_SIZE]__attribute__ ((aligned(32))); | |
115 | unsigned char flip[IN_BUFFER_SIZE] __attribute__ ((aligned(32))); | |
116 | struct dma_descr_data* next_rx_desc; | |
117 | struct dma_descr_data* prev_rx_desc; | |
e908dfc3 JN |
118 | |
119 | /* Pointer to the first available descriptor in the ring, | |
120 | * unless active_tr_descr == catch_tr_descr and a dma | |
121 | * transfer is active */ | |
122 | struct dma_descr_data *active_tr_descr; | |
123 | ||
124 | /* Pointer to the first allocated descriptor in the ring */ | |
125 | struct dma_descr_data *catch_tr_descr; | |
126 | ||
127 | /* Pointer to the descriptor with the current end-of-list */ | |
128 | struct dma_descr_data *prev_tr_descr; | |
51533b61 MS |
129 | int full; |
130 | ||
e908dfc3 JN |
131 | /* Pointer to the first byte being read by DMA |
132 | * or current position in out_buffer if not using DMA. */ | |
133 | unsigned char *out_rd_ptr; | |
134 | ||
135 | /* Number of bytes currently locked for being read by DMA */ | |
136 | int out_buf_count; | |
137 | ||
138 | dma_descr_data in_descr[NBR_IN_DESCR] __attribute__ ((__aligned__(16))); | |
51533b61 | 139 | dma_descr_context in_context __attribute__ ((__aligned__(32))); |
e908dfc3 JN |
140 | dma_descr_data out_descr[NBR_OUT_DESCR] |
141 | __attribute__ ((__aligned__(16))); | |
51533b61 MS |
142 | dma_descr_context out_context __attribute__ ((__aligned__(32))); |
143 | wait_queue_head_t out_wait_q; | |
144 | wait_queue_head_t in_wait_q; | |
145 | ||
146 | spinlock_t lock; | |
147 | } sync_port; | |
148 | ||
149 | static int etrax_sync_serial_init(void); | |
150 | static void initialize_port(int portnbr); | |
151 | static inline int sync_data_avail(struct sync_port *port); | |
152 | ||
153 | static int sync_serial_open(struct inode *, struct file*); | |
154 | static int sync_serial_release(struct inode*, struct file*); | |
155 | static unsigned int sync_serial_poll(struct file *filp, poll_table *wait); | |
156 | ||
157 | static int sync_serial_ioctl(struct inode*, struct file*, | |
158 | unsigned int cmd, unsigned long arg); | |
159 | static ssize_t sync_serial_write(struct file * file, const char * buf, | |
160 | size_t count, loff_t *ppos); | |
161 | static ssize_t sync_serial_read(struct file *file, char *buf, | |
162 | size_t count, loff_t *ppos); | |
163 | ||
164 | #if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \ | |
165 | defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \ | |
166 | (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \ | |
167 | defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)) | |
168 | #define SYNC_SER_DMA | |
169 | #endif | |
170 | ||
171 | static void send_word(sync_port* port); | |
e908dfc3 | 172 | static void start_dma_out(struct sync_port *port, const char *data, int count); |
51533b61 MS |
173 | static void start_dma_in(sync_port* port); |
174 | #ifdef SYNC_SER_DMA | |
e908dfc3 JN |
175 | static irqreturn_t tr_interrupt(int irq, void *dev_id); |
176 | static irqreturn_t rx_interrupt(int irq, void *dev_id); | |
51533b61 MS |
177 | #endif |
178 | ||
179 | #if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \ | |
180 | !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \ | |
181 | (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \ | |
182 | !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)) | |
183 | #define SYNC_SER_MANUAL | |
184 | #endif | |
185 | #ifdef SYNC_SER_MANUAL | |
e908dfc3 JN |
186 | static irqreturn_t manual_interrupt(int irq, void *dev_id); |
187 | #endif | |
188 | ||
189 | #ifdef CONFIG_ETRAXFS /* ETRAX FS */ | |
190 | #define OUT_DMA_NBR 4 | |
191 | #define IN_DMA_NBR 5 | |
192 | #define PINMUX_SSER pinmux_sser0 | |
193 | #define SYNCSER_INST regi_sser0 | |
194 | #define SYNCSER_INTR_VECT SSER0_INTR_VECT | |
195 | #define OUT_DMA_INST regi_dma4 | |
196 | #define IN_DMA_INST regi_dma5 | |
197 | #define DMA_OUT_INTR_VECT DMA4_INTR_VECT | |
198 | #define DMA_IN_INTR_VECT DMA5_INTR_VECT | |
199 | #define REQ_DMA_SYNCSER dma_sser0 | |
200 | #else /* Artpec-3 */ | |
201 | #define OUT_DMA_NBR 6 | |
202 | #define IN_DMA_NBR 7 | |
203 | #define PINMUX_SSER pinmux_sser | |
204 | #define SYNCSER_INST regi_sser | |
205 | #define SYNCSER_INTR_VECT SSER_INTR_VECT | |
206 | #define OUT_DMA_INST regi_dma6 | |
207 | #define IN_DMA_INST regi_dma7 | |
208 | #define DMA_OUT_INTR_VECT DMA6_INTR_VECT | |
209 | #define DMA_IN_INTR_VECT DMA7_INTR_VECT | |
210 | #define REQ_DMA_SYNCSER dma_sser | |
51533b61 MS |
211 | #endif |
212 | ||
213 | /* The ports */ | |
214 | static struct sync_port ports[]= | |
215 | { | |
216 | { | |
e908dfc3 JN |
217 | .regi_sser = SYNCSER_INST, |
218 | .regi_dmaout = OUT_DMA_INST, | |
219 | .regi_dmain = IN_DMA_INST, | |
51533b61 MS |
220 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA) |
221 | .use_dma = 1, | |
222 | #else | |
223 | .use_dma = 0, | |
224 | #endif | |
e908dfc3 JN |
225 | } |
226 | #ifdef CONFIG_ETRAXFS | |
227 | , | |
228 | ||
51533b61 MS |
229 | { |
230 | .regi_sser = regi_sser1, | |
231 | .regi_dmaout = regi_dma6, | |
232 | .regi_dmain = regi_dma7, | |
233 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA) | |
234 | .use_dma = 1, | |
235 | #else | |
236 | .use_dma = 0, | |
237 | #endif | |
238 | } | |
e908dfc3 | 239 | #endif |
51533b61 MS |
240 | }; |
241 | ||
e908dfc3 | 242 | #define NBR_PORTS ARRAY_SIZE(ports) |
51533b61 | 243 | |
5dfe4c96 | 244 | static const struct file_operations sync_serial_fops = { |
51533b61 MS |
245 | .owner = THIS_MODULE, |
246 | .write = sync_serial_write, | |
247 | .read = sync_serial_read, | |
248 | .poll = sync_serial_poll, | |
249 | .ioctl = sync_serial_ioctl, | |
250 | .open = sync_serial_open, | |
251 | .release = sync_serial_release | |
252 | }; | |
253 | ||
254 | static int __init etrax_sync_serial_init(void) | |
255 | { | |
256 | ports[0].enabled = 0; | |
e908dfc3 | 257 | #ifdef CONFIG_ETRAXFS |
51533b61 | 258 | ports[1].enabled = 0; |
e908dfc3 JN |
259 | #endif |
260 | if (register_chrdev(SYNC_SERIAL_MAJOR, "sync serial", | |
261 | &sync_serial_fops) < 0) { | |
262 | printk(KERN_WARNING | |
263 | "Unable to get major for synchronous serial port\n"); | |
51533b61 MS |
264 | return -EBUSY; |
265 | } | |
266 | ||
267 | /* Initialize Ports */ | |
268 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) | |
e908dfc3 JN |
269 | if (crisv32_pinmux_alloc_fixed(PINMUX_SSER)) { |
270 | printk(KERN_WARNING | |
271 | "Unable to alloc pins for synchronous serial port 0\n"); | |
51533b61 MS |
272 | return -EIO; |
273 | } | |
274 | ports[0].enabled = 1; | |
275 | initialize_port(0); | |
276 | #endif | |
277 | ||
278 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) | |
e908dfc3 JN |
279 | if (crisv32_pinmux_alloc_fixed(pinmux_sser1)) { |
280 | printk(KERN_WARNING | |
281 | "Unable to alloc pins for synchronous serial port 0\n"); | |
51533b61 MS |
282 | return -EIO; |
283 | } | |
284 | ports[1].enabled = 1; | |
285 | initialize_port(1); | |
286 | #endif | |
287 | ||
e908dfc3 JN |
288 | #ifdef CONFIG_ETRAXFS |
289 | printk(KERN_INFO "ETRAX FS synchronous serial port driver\n"); | |
290 | #else | |
291 | printk(KERN_INFO "Artpec-3 synchronous serial port driver\n"); | |
292 | #endif | |
51533b61 MS |
293 | return 0; |
294 | } | |
295 | ||
296 | static void __init initialize_port(int portnbr) | |
297 | { | |
e908dfc3 JN |
298 | int __attribute__((unused)) i; |
299 | struct sync_port *port = &ports[portnbr]; | |
51533b61 MS |
300 | reg_sser_rw_cfg cfg = {0}; |
301 | reg_sser_rw_frm_cfg frm_cfg = {0}; | |
302 | reg_sser_rw_tr_cfg tr_cfg = {0}; | |
303 | reg_sser_rw_rec_cfg rec_cfg = {0}; | |
304 | ||
e908dfc3 | 305 | DEBUG(printk(KERN_DEBUG "Init sync serial port %d\n", portnbr)); |
51533b61 MS |
306 | |
307 | port->port_nbr = portnbr; | |
308 | port->init_irqs = 1; | |
309 | ||
e908dfc3 JN |
310 | port->out_rd_ptr = port->out_buffer; |
311 | port->out_buf_count = 0; | |
312 | ||
51533b61 MS |
313 | port->output = 1; |
314 | port->input = 0; | |
315 | ||
316 | port->readp = port->flip; | |
317 | port->writep = port->flip; | |
318 | port->in_buffer_size = IN_BUFFER_SIZE; | |
319 | port->inbufchunk = IN_DESCR_SIZE; | |
320 | port->next_rx_desc = &port->in_descr[0]; | |
e908dfc3 | 321 | port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR-1]; |
51533b61 MS |
322 | port->prev_rx_desc->eol = 1; |
323 | ||
324 | init_waitqueue_head(&port->out_wait_q); | |
325 | init_waitqueue_head(&port->in_wait_q); | |
326 | ||
327 | spin_lock_init(&port->lock); | |
328 | ||
329 | cfg.out_clk_src = regk_sser_intern_clk; | |
330 | cfg.out_clk_pol = regk_sser_pos; | |
331 | cfg.clk_od_mode = regk_sser_no; | |
332 | cfg.clk_dir = regk_sser_out; | |
333 | cfg.gate_clk = regk_sser_no; | |
334 | cfg.base_freq = regk_sser_f29_493; | |
335 | cfg.clk_div = 256; | |
336 | REG_WR(sser, port->regi_sser, rw_cfg, cfg); | |
337 | ||
338 | frm_cfg.wordrate = DEFAULT_WORD_RATE; | |
339 | frm_cfg.type = regk_sser_edge; | |
340 | frm_cfg.frame_pin_dir = regk_sser_out; | |
341 | frm_cfg.frame_pin_use = regk_sser_frm; | |
342 | frm_cfg.status_pin_dir = regk_sser_in; | |
343 | frm_cfg.status_pin_use = regk_sser_hold; | |
344 | frm_cfg.out_on = regk_sser_tr; | |
345 | frm_cfg.tr_delay = 1; | |
346 | REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg); | |
347 | ||
348 | tr_cfg.urun_stop = regk_sser_no; | |
349 | tr_cfg.sample_size = 7; | |
350 | tr_cfg.sh_dir = regk_sser_msbfirst; | |
351 | tr_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no; | |
e908dfc3 | 352 | #if 0 |
51533b61 MS |
353 | tr_cfg.rate_ctrl = regk_sser_bulk; |
354 | tr_cfg.data_pin_use = regk_sser_dout; | |
e908dfc3 JN |
355 | #else |
356 | tr_cfg.rate_ctrl = regk_sser_iso; | |
357 | tr_cfg.data_pin_use = regk_sser_dout; | |
358 | #endif | |
51533b61 MS |
359 | tr_cfg.bulk_wspace = 1; |
360 | REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); | |
361 | ||
362 | rec_cfg.sample_size = 7; | |
363 | rec_cfg.sh_dir = regk_sser_msbfirst; | |
364 | rec_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no; | |
365 | rec_cfg.fifo_thr = regk_sser_inf; | |
366 | REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); | |
e908dfc3 JN |
367 | |
368 | #ifdef SYNC_SER_DMA | |
369 | /* Setup the descriptor ring for dma out/transmit. */ | |
370 | for (i = 0; i < NBR_OUT_DESCR; i++) { | |
371 | port->out_descr[i].wait = 0; | |
372 | port->out_descr[i].intr = 1; | |
373 | port->out_descr[i].eol = 0; | |
374 | port->out_descr[i].out_eop = 0; | |
375 | port->out_descr[i].next = | |
376 | (dma_descr_data *)virt_to_phys(&port->out_descr[i+1]); | |
377 | } | |
378 | ||
379 | /* Create a ring from the list. */ | |
380 | port->out_descr[NBR_OUT_DESCR-1].next = | |
381 | (dma_descr_data *)virt_to_phys(&port->out_descr[0]); | |
382 | ||
383 | /* Setup context for traversing the ring. */ | |
384 | port->active_tr_descr = &port->out_descr[0]; | |
385 | port->prev_tr_descr = &port->out_descr[NBR_OUT_DESCR-1]; | |
386 | port->catch_tr_descr = &port->out_descr[0]; | |
387 | #endif | |
51533b61 MS |
388 | } |
389 | ||
390 | static inline int sync_data_avail(struct sync_port *port) | |
391 | { | |
392 | int avail; | |
393 | unsigned char *start; | |
394 | unsigned char *end; | |
395 | ||
396 | start = (unsigned char*)port->readp; /* cast away volatile */ | |
397 | end = (unsigned char*)port->writep; /* cast away volatile */ | |
398 | /* 0123456789 0123456789 | |
399 | * ----- - ----- | |
400 | * ^rp ^wp ^wp ^rp | |
401 | */ | |
402 | ||
e908dfc3 | 403 | if (end >= start) |
51533b61 MS |
404 | avail = end - start; |
405 | else | |
406 | avail = port->in_buffer_size - (start - end); | |
407 | return avail; | |
408 | } | |
409 | ||
410 | static inline int sync_data_avail_to_end(struct sync_port *port) | |
411 | { | |
412 | int avail; | |
413 | unsigned char *start; | |
414 | unsigned char *end; | |
415 | ||
416 | start = (unsigned char*)port->readp; /* cast away volatile */ | |
417 | end = (unsigned char*)port->writep; /* cast away volatile */ | |
418 | /* 0123456789 0123456789 | |
419 | * ----- ----- | |
420 | * ^rp ^wp ^wp ^rp | |
421 | */ | |
422 | ||
e908dfc3 | 423 | if (end >= start) |
51533b61 MS |
424 | avail = end - start; |
425 | else | |
426 | avail = port->flip + port->in_buffer_size - start; | |
427 | return avail; | |
428 | } | |
429 | ||
430 | static int sync_serial_open(struct inode *inode, struct file *file) | |
431 | { | |
32ea086b | 432 | int dev = iminor(inode); |
0c401df3 | 433 | int ret = -EBUSY; |
e908dfc3 | 434 | sync_port *port; |
51533b61 MS |
435 | reg_dma_rw_cfg cfg = {.en = regk_dma_yes}; |
436 | reg_dma_rw_intr_mask intr_mask = {.data = regk_dma_yes}; | |
437 | ||
0c401df3 | 438 | lock_kernel(); |
e908dfc3 | 439 | DEBUG(printk(KERN_DEBUG "Open sync serial port %d\n", dev)); |
51533b61 | 440 | |
e908dfc3 | 441 | if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) |
51533b61 | 442 | { |
e908dfc3 | 443 | DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev)); |
0c401df3 JC |
444 | ret = -ENODEV; |
445 | goto out; | |
51533b61 MS |
446 | } |
447 | port = &ports[dev]; | |
448 | /* Allow open this device twice (assuming one reader and one writer) */ | |
449 | if (port->busy == 2) | |
450 | { | |
e908dfc3 | 451 | DEBUG(printk(KERN_DEBUG "Device is busy.. \n")); |
0c401df3 | 452 | goto out; |
51533b61 | 453 | } |
e908dfc3 JN |
454 | |
455 | ||
51533b61 MS |
456 | if (port->init_irqs) { |
457 | if (port->use_dma) { | |
e908dfc3 | 458 | if (port == &ports[0]) { |
51533b61 | 459 | #ifdef SYNC_SER_DMA |
e908dfc3 JN |
460 | if (request_irq(DMA_OUT_INTR_VECT, |
461 | tr_interrupt, | |
462 | 0, | |
463 | "synchronous serial 0 dma tr", | |
464 | &ports[0])) { | |
51533b61 | 465 | printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ"); |
0c401df3 | 466 | goto out; |
e908dfc3 JN |
467 | } else if (request_irq(DMA_IN_INTR_VECT, |
468 | rx_interrupt, | |
469 | 0, | |
470 | "synchronous serial 1 dma rx", | |
471 | &ports[0])) { | |
472 | free_irq(DMA_OUT_INTR_VECT, &port[0]); | |
51533b61 | 473 | printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ"); |
0c401df3 | 474 | goto out; |
e908dfc3 JN |
475 | } else if (crisv32_request_dma(OUT_DMA_NBR, |
476 | "synchronous serial 0 dma tr", | |
477 | DMA_VERBOSE_ON_ERROR, | |
478 | 0, | |
479 | REQ_DMA_SYNCSER)) { | |
480 | free_irq(DMA_OUT_INTR_VECT, &port[0]); | |
481 | free_irq(DMA_IN_INTR_VECT, &port[0]); | |
51533b61 | 482 | printk(KERN_CRIT "Can't allocate sync serial port 0 TX DMA channel"); |
0c401df3 | 483 | goto out; |
e908dfc3 JN |
484 | } else if (crisv32_request_dma(IN_DMA_NBR, |
485 | "synchronous serial 0 dma rec", | |
486 | DMA_VERBOSE_ON_ERROR, | |
487 | 0, | |
488 | REQ_DMA_SYNCSER)) { | |
489 | crisv32_free_dma(OUT_DMA_NBR); | |
490 | free_irq(DMA_OUT_INTR_VECT, &port[0]); | |
491 | free_irq(DMA_IN_INTR_VECT, &port[0]); | |
51533b61 | 492 | printk(KERN_CRIT "Can't allocate sync serial port 1 RX DMA channel"); |
0c401df3 | 493 | goto out; |
51533b61 MS |
494 | } |
495 | #endif | |
496 | } | |
e908dfc3 JN |
497 | #ifdef CONFIG_ETRAXFS |
498 | else if (port == &ports[1]) { | |
51533b61 MS |
499 | #ifdef SYNC_SER_DMA |
500 | if (request_irq(DMA6_INTR_VECT, | |
501 | tr_interrupt, | |
502 | 0, | |
503 | "synchronous serial 1 dma tr", | |
504 | &ports[1])) { | |
505 | printk(KERN_CRIT "Can't allocate sync serial port 1 IRQ"); | |
0c401df3 | 506 | goto out; |
51533b61 MS |
507 | } else if (request_irq(DMA7_INTR_VECT, |
508 | rx_interrupt, | |
509 | 0, | |
510 | "synchronous serial 1 dma rx", | |
511 | &ports[1])) { | |
512 | free_irq(DMA6_INTR_VECT, &ports[1]); | |
513 | printk(KERN_CRIT "Can't allocate sync serial port 3 IRQ"); | |
0c401df3 | 514 | goto out; |
e908dfc3 JN |
515 | } else if (crisv32_request_dma( |
516 | SYNC_SER1_TX_DMA_NBR, | |
517 | "synchronous serial 1 dma tr", | |
518 | DMA_VERBOSE_ON_ERROR, | |
519 | 0, | |
520 | dma_sser1)) { | |
521 | free_irq(DMA6_INTR_VECT, &ports[1]); | |
522 | free_irq(DMA7_INTR_VECT, &ports[1]); | |
51533b61 | 523 | printk(KERN_CRIT "Can't allocate sync serial port 3 TX DMA channel"); |
0c401df3 | 524 | goto out; |
e908dfc3 JN |
525 | } else if (crisv32_request_dma( |
526 | SYNC_SER1_RX_DMA_NBR, | |
527 | "synchronous serial 3 dma rec", | |
528 | DMA_VERBOSE_ON_ERROR, | |
529 | 0, | |
530 | dma_sser1)) { | |
51533b61 MS |
531 | crisv32_free_dma(SYNC_SER1_TX_DMA_NBR); |
532 | free_irq(DMA6_INTR_VECT, &ports[1]); | |
533 | free_irq(DMA7_INTR_VECT, &ports[1]); | |
534 | printk(KERN_CRIT "Can't allocate sync serial port 3 RX DMA channel"); | |
0c401df3 | 535 | goto out; |
51533b61 MS |
536 | } |
537 | #endif | |
538 | } | |
e908dfc3 | 539 | #endif |
51533b61 MS |
540 | /* Enable DMAs */ |
541 | REG_WR(dma, port->regi_dmain, rw_cfg, cfg); | |
542 | REG_WR(dma, port->regi_dmaout, rw_cfg, cfg); | |
543 | /* Enable DMA IRQs */ | |
544 | REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask); | |
545 | REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask); | |
e908dfc3 | 546 | /* Set up wordsize = 1 for DMAs. */ |
51533b61 MS |
547 | DMA_WR_CMD (port->regi_dmain, regk_dma_set_w_size1); |
548 | DMA_WR_CMD (port->regi_dmaout, regk_dma_set_w_size1); | |
549 | ||
550 | start_dma_in(port); | |
551 | port->init_irqs = 0; | |
552 | } else { /* !port->use_dma */ | |
553 | #ifdef SYNC_SER_MANUAL | |
554 | if (port == &ports[0]) { | |
e908dfc3 | 555 | if (request_irq(SYNCSER_INTR_VECT, |
51533b61 MS |
556 | manual_interrupt, |
557 | 0, | |
558 | "synchronous serial manual irq", | |
559 | &ports[0])) { | |
560 | printk("Can't allocate sync serial manual irq"); | |
0c401df3 | 561 | goto out; |
51533b61 | 562 | } |
e908dfc3 JN |
563 | } |
564 | #ifdef CONFIG_ETRAXFS | |
565 | else if (port == &ports[1]) { | |
51533b61 MS |
566 | if (request_irq(SSER1_INTR_VECT, |
567 | manual_interrupt, | |
568 | 0, | |
569 | "synchronous serial manual irq", | |
570 | &ports[1])) { | |
571 | printk(KERN_CRIT "Can't allocate sync serial manual irq"); | |
0c401df3 | 572 | goto out; |
51533b61 MS |
573 | } |
574 | } | |
e908dfc3 | 575 | #endif |
51533b61 MS |
576 | port->init_irqs = 0; |
577 | #else | |
578 | panic("sync_serial: Manual mode not supported.\n"); | |
579 | #endif /* SYNC_SER_MANUAL */ | |
580 | } | |
e908dfc3 | 581 | |
51533b61 MS |
582 | } /* port->init_irqs */ |
583 | ||
584 | port->busy++; | |
0c401df3 JC |
585 | ret = 0; |
586 | out: | |
587 | unlock_kernel(); | |
588 | return ret; | |
51533b61 MS |
589 | } |
590 | ||
591 | static int sync_serial_release(struct inode *inode, struct file *file) | |
592 | { | |
32ea086b | 593 | int dev = iminor(inode); |
e908dfc3 | 594 | sync_port *port; |
51533b61 | 595 | |
e908dfc3 | 596 | if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) |
51533b61 MS |
597 | { |
598 | DEBUG(printk("Invalid minor %d\n", dev)); | |
599 | return -ENODEV; | |
600 | } | |
601 | port = &ports[dev]; | |
602 | if (port->busy) | |
603 | port->busy--; | |
604 | if (!port->busy) | |
605 | /* XXX */ ; | |
606 | return 0; | |
607 | } | |
608 | ||
609 | static unsigned int sync_serial_poll(struct file *file, poll_table *wait) | |
610 | { | |
d817be9c | 611 | int dev = iminor(file->f_path.dentry->d_inode); |
51533b61 | 612 | unsigned int mask = 0; |
e908dfc3 | 613 | sync_port *port; |
51533b61 MS |
614 | DEBUGPOLL( static unsigned int prev_mask = 0; ); |
615 | ||
616 | port = &ports[dev]; | |
e908dfc3 JN |
617 | |
618 | if (!port->started) { | |
619 | reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg); | |
620 | reg_sser_rw_rec_cfg rec_cfg = | |
621 | REG_RD(sser, port->regi_sser, rw_rec_cfg); | |
622 | cfg.en = regk_sser_yes; | |
623 | rec_cfg.rec_en = port->input; | |
624 | REG_WR(sser, port->regi_sser, rw_cfg, cfg); | |
625 | REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); | |
626 | port->started = 1; | |
627 | } | |
628 | ||
51533b61 MS |
629 | poll_wait(file, &port->out_wait_q, wait); |
630 | poll_wait(file, &port->in_wait_q, wait); | |
e908dfc3 JN |
631 | |
632 | /* No active transfer, descriptors are available */ | |
633 | if (port->output && !port->tr_running) | |
634 | mask |= POLLOUT | POLLWRNORM; | |
635 | ||
636 | /* Descriptor and buffer space available. */ | |
637 | if (port->output && | |
638 | port->active_tr_descr != port->catch_tr_descr && | |
639 | port->out_buf_count < OUT_BUFFER_SIZE) | |
51533b61 | 640 | mask |= POLLOUT | POLLWRNORM; |
e908dfc3 | 641 | |
51533b61 | 642 | /* At least an inbufchunk of data */ |
e908dfc3 | 643 | if (port->input && sync_data_avail(port) >= port->inbufchunk) |
51533b61 MS |
644 | mask |= POLLIN | POLLRDNORM; |
645 | ||
646 | DEBUGPOLL(if (mask != prev_mask) | |
647 | printk("sync_serial_poll: mask 0x%08X %s %s\n", mask, | |
648 | mask&POLLOUT?"POLLOUT":"", mask&POLLIN?"POLLIN":""); | |
649 | prev_mask = mask; | |
650 | ); | |
651 | return mask; | |
652 | } | |
653 | ||
654 | static int sync_serial_ioctl(struct inode *inode, struct file *file, | |
655 | unsigned int cmd, unsigned long arg) | |
656 | { | |
657 | int return_val = 0; | |
e908dfc3 | 658 | int dma_w_size = regk_dma_set_w_size1; |
d817be9c | 659 | int dev = iminor(file->f_path.dentry->d_inode); |
e908dfc3 | 660 | sync_port *port; |
51533b61 MS |
661 | reg_sser_rw_tr_cfg tr_cfg; |
662 | reg_sser_rw_rec_cfg rec_cfg; | |
663 | reg_sser_rw_frm_cfg frm_cfg; | |
664 | reg_sser_rw_cfg gen_cfg; | |
665 | reg_sser_rw_intr_mask intr_mask; | |
666 | ||
e908dfc3 | 667 | if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) |
51533b61 MS |
668 | { |
669 | DEBUG(printk("Invalid minor %d\n", dev)); | |
670 | return -1; | |
671 | } | |
672 | port = &ports[dev]; | |
673 | spin_lock_irq(&port->lock); | |
674 | ||
675 | tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); | |
676 | rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg); | |
677 | frm_cfg = REG_RD(sser, port->regi_sser, rw_frm_cfg); | |
678 | gen_cfg = REG_RD(sser, port->regi_sser, rw_cfg); | |
679 | intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask); | |
680 | ||
681 | switch(cmd) | |
682 | { | |
683 | case SSP_SPEED: | |
684 | if (GET_SPEED(arg) == CODEC) | |
685 | { | |
e908dfc3 JN |
686 | unsigned int freq; |
687 | ||
51533b61 | 688 | gen_cfg.base_freq = regk_sser_f32; |
e908dfc3 JN |
689 | |
690 | /* Clock divider will internally be | |
691 | * gen_cfg.clk_div + 1. | |
692 | */ | |
693 | ||
694 | freq = GET_FREQ(arg); | |
695 | switch (freq) { | |
696 | case FREQ_32kHz: | |
697 | case FREQ_64kHz: | |
698 | case FREQ_128kHz: | |
699 | case FREQ_256kHz: | |
700 | gen_cfg.clk_div = 125 * | |
701 | (1 << (freq - FREQ_256kHz)) - 1; | |
702 | break; | |
703 | case FREQ_512kHz: | |
704 | gen_cfg.clk_div = 62; | |
705 | break; | |
706 | case FREQ_1MHz: | |
707 | case FREQ_2MHz: | |
708 | case FREQ_4MHz: | |
709 | gen_cfg.clk_div = 8 * (1 << freq) - 1; | |
710 | break; | |
711 | } | |
712 | } else { | |
51533b61 | 713 | gen_cfg.base_freq = regk_sser_f29_493; |
e908dfc3 JN |
714 | switch (GET_SPEED(arg)) { |
715 | case SSP150: | |
716 | gen_cfg.clk_div = 29493000 / (150 * 8) - 1; | |
717 | break; | |
718 | case SSP300: | |
719 | gen_cfg.clk_div = 29493000 / (300 * 8) - 1; | |
720 | break; | |
721 | case SSP600: | |
722 | gen_cfg.clk_div = 29493000 / (600 * 8) - 1; | |
723 | break; | |
724 | case SSP1200: | |
725 | gen_cfg.clk_div = 29493000 / (1200 * 8) - 1; | |
726 | break; | |
727 | case SSP2400: | |
728 | gen_cfg.clk_div = 29493000 / (2400 * 8) - 1; | |
729 | break; | |
730 | case SSP4800: | |
731 | gen_cfg.clk_div = 29493000 / (4800 * 8) - 1; | |
732 | break; | |
733 | case SSP9600: | |
734 | gen_cfg.clk_div = 29493000 / (9600 * 8) - 1; | |
735 | break; | |
736 | case SSP19200: | |
737 | gen_cfg.clk_div = 29493000 / (19200 * 8) - 1; | |
738 | break; | |
739 | case SSP28800: | |
740 | gen_cfg.clk_div = 29493000 / (28800 * 8) - 1; | |
741 | break; | |
742 | case SSP57600: | |
743 | gen_cfg.clk_div = 29493000 / (57600 * 8) - 1; | |
744 | break; | |
745 | case SSP115200: | |
746 | gen_cfg.clk_div = 29493000 / (115200 * 8) - 1; | |
747 | break; | |
748 | case SSP230400: | |
749 | gen_cfg.clk_div = 29493000 / (230400 * 8) - 1; | |
750 | break; | |
751 | case SSP460800: | |
752 | gen_cfg.clk_div = 29493000 / (460800 * 8) - 1; | |
753 | break; | |
754 | case SSP921600: | |
755 | gen_cfg.clk_div = 29493000 / (921600 * 8) - 1; | |
756 | break; | |
757 | case SSP3125000: | |
758 | gen_cfg.base_freq = regk_sser_f100; | |
759 | gen_cfg.clk_div = 100000000 / (3125000 * 8) - 1; | |
760 | break; | |
51533b61 MS |
761 | |
762 | } | |
763 | } | |
764 | frm_cfg.wordrate = GET_WORD_RATE(arg); | |
765 | ||
766 | break; | |
767 | case SSP_MODE: | |
768 | switch(arg) | |
769 | { | |
770 | case MASTER_OUTPUT: | |
771 | port->output = 1; | |
772 | port->input = 0; | |
e908dfc3 JN |
773 | frm_cfg.out_on = regk_sser_tr; |
774 | frm_cfg.frame_pin_dir = regk_sser_out; | |
51533b61 MS |
775 | gen_cfg.clk_dir = regk_sser_out; |
776 | break; | |
777 | case SLAVE_OUTPUT: | |
778 | port->output = 1; | |
779 | port->input = 0; | |
e908dfc3 | 780 | frm_cfg.frame_pin_dir = regk_sser_in; |
51533b61 MS |
781 | gen_cfg.clk_dir = regk_sser_in; |
782 | break; | |
783 | case MASTER_INPUT: | |
784 | port->output = 0; | |
785 | port->input = 1; | |
e908dfc3 JN |
786 | frm_cfg.frame_pin_dir = regk_sser_out; |
787 | frm_cfg.out_on = regk_sser_intern_tb; | |
51533b61 MS |
788 | gen_cfg.clk_dir = regk_sser_out; |
789 | break; | |
790 | case SLAVE_INPUT: | |
791 | port->output = 0; | |
792 | port->input = 1; | |
e908dfc3 | 793 | frm_cfg.frame_pin_dir = regk_sser_in; |
51533b61 MS |
794 | gen_cfg.clk_dir = regk_sser_in; |
795 | break; | |
796 | case MASTER_BIDIR: | |
797 | port->output = 1; | |
798 | port->input = 1; | |
e908dfc3 JN |
799 | frm_cfg.frame_pin_dir = regk_sser_out; |
800 | frm_cfg.out_on = regk_sser_intern_tb; | |
51533b61 MS |
801 | gen_cfg.clk_dir = regk_sser_out; |
802 | break; | |
803 | case SLAVE_BIDIR: | |
804 | port->output = 1; | |
805 | port->input = 1; | |
e908dfc3 | 806 | frm_cfg.frame_pin_dir = regk_sser_in; |
51533b61 MS |
807 | gen_cfg.clk_dir = regk_sser_in; |
808 | break; | |
809 | default: | |
810 | spin_unlock_irq(&port->lock); | |
811 | return -EINVAL; | |
51533b61 MS |
812 | } |
813 | if (!port->use_dma || (arg == MASTER_OUTPUT || arg == SLAVE_OUTPUT)) | |
814 | intr_mask.rdav = regk_sser_yes; | |
815 | break; | |
816 | case SSP_FRAME_SYNC: | |
e908dfc3 JN |
817 | if (arg & NORMAL_SYNC) { |
818 | frm_cfg.rec_delay = 1; | |
51533b61 | 819 | frm_cfg.tr_delay = 1; |
e908dfc3 | 820 | } |
51533b61 | 821 | else if (arg & EARLY_SYNC) |
e908dfc3 JN |
822 | frm_cfg.rec_delay = frm_cfg.tr_delay = 0; |
823 | else if (arg & SECOND_WORD_SYNC) { | |
824 | frm_cfg.rec_delay = 7; | |
825 | frm_cfg.tr_delay = 1; | |
826 | } | |
51533b61 MS |
827 | |
828 | tr_cfg.bulk_wspace = frm_cfg.tr_delay; | |
829 | frm_cfg.early_wend = regk_sser_yes; | |
830 | if (arg & BIT_SYNC) | |
831 | frm_cfg.type = regk_sser_edge; | |
832 | else if (arg & WORD_SYNC) | |
833 | frm_cfg.type = regk_sser_level; | |
834 | else if (arg & EXTENDED_SYNC) | |
835 | frm_cfg.early_wend = regk_sser_no; | |
836 | ||
837 | if (arg & SYNC_ON) | |
838 | frm_cfg.frame_pin_use = regk_sser_frm; | |
839 | else if (arg & SYNC_OFF) | |
840 | frm_cfg.frame_pin_use = regk_sser_gio0; | |
841 | ||
e908dfc3 JN |
842 | dma_w_size = regk_dma_set_w_size2; |
843 | if (arg & WORD_SIZE_8) { | |
51533b61 | 844 | rec_cfg.sample_size = tr_cfg.sample_size = 7; |
e908dfc3 JN |
845 | dma_w_size = regk_dma_set_w_size1; |
846 | } else if (arg & WORD_SIZE_12) | |
51533b61 MS |
847 | rec_cfg.sample_size = tr_cfg.sample_size = 11; |
848 | else if (arg & WORD_SIZE_16) | |
849 | rec_cfg.sample_size = tr_cfg.sample_size = 15; | |
850 | else if (arg & WORD_SIZE_24) | |
851 | rec_cfg.sample_size = tr_cfg.sample_size = 23; | |
852 | else if (arg & WORD_SIZE_32) | |
853 | rec_cfg.sample_size = tr_cfg.sample_size = 31; | |
854 | ||
855 | if (arg & BIT_ORDER_MSB) | |
856 | rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst; | |
857 | else if (arg & BIT_ORDER_LSB) | |
858 | rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_lsbfirst; | |
859 | ||
e908dfc3 JN |
860 | if (arg & FLOW_CONTROL_ENABLE) { |
861 | frm_cfg.status_pin_use = regk_sser_frm; | |
51533b61 | 862 | rec_cfg.fifo_thr = regk_sser_thr16; |
e908dfc3 JN |
863 | } else if (arg & FLOW_CONTROL_DISABLE) { |
864 | frm_cfg.status_pin_use = regk_sser_gio0; | |
51533b61 | 865 | rec_cfg.fifo_thr = regk_sser_inf; |
e908dfc3 | 866 | } |
51533b61 MS |
867 | |
868 | if (arg & CLOCK_NOT_GATED) | |
869 | gen_cfg.gate_clk = regk_sser_no; | |
870 | else if (arg & CLOCK_GATED) | |
871 | gen_cfg.gate_clk = regk_sser_yes; | |
872 | ||
873 | break; | |
874 | case SSP_IPOLARITY: | |
875 | /* NOTE!! negedge is considered NORMAL */ | |
876 | if (arg & CLOCK_NORMAL) | |
877 | rec_cfg.clk_pol = regk_sser_neg; | |
878 | else if (arg & CLOCK_INVERT) | |
879 | rec_cfg.clk_pol = regk_sser_pos; | |
880 | ||
881 | if (arg & FRAME_NORMAL) | |
882 | frm_cfg.level = regk_sser_pos_hi; | |
883 | else if (arg & FRAME_INVERT) | |
884 | frm_cfg.level = regk_sser_neg_lo; | |
885 | ||
886 | if (arg & STATUS_NORMAL) | |
887 | gen_cfg.hold_pol = regk_sser_pos; | |
888 | else if (arg & STATUS_INVERT) | |
889 | gen_cfg.hold_pol = regk_sser_neg; | |
890 | break; | |
891 | case SSP_OPOLARITY: | |
892 | if (arg & CLOCK_NORMAL) | |
51533b61 | 893 | gen_cfg.out_clk_pol = regk_sser_pos; |
e908dfc3 JN |
894 | else if (arg & CLOCK_INVERT) |
895 | gen_cfg.out_clk_pol = regk_sser_neg; | |
51533b61 MS |
896 | |
897 | if (arg & FRAME_NORMAL) | |
898 | frm_cfg.level = regk_sser_pos_hi; | |
899 | else if (arg & FRAME_INVERT) | |
900 | frm_cfg.level = regk_sser_neg_lo; | |
901 | ||
902 | if (arg & STATUS_NORMAL) | |
903 | gen_cfg.hold_pol = regk_sser_pos; | |
904 | else if (arg & STATUS_INVERT) | |
905 | gen_cfg.hold_pol = regk_sser_neg; | |
906 | break; | |
907 | case SSP_SPI: | |
908 | rec_cfg.fifo_thr = regk_sser_inf; | |
909 | rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst; | |
910 | rec_cfg.sample_size = tr_cfg.sample_size = 7; | |
911 | frm_cfg.frame_pin_use = regk_sser_frm; | |
912 | frm_cfg.type = regk_sser_level; | |
913 | frm_cfg.tr_delay = 1; | |
914 | frm_cfg.level = regk_sser_neg_lo; | |
915 | if (arg & SPI_SLAVE) | |
916 | { | |
917 | rec_cfg.clk_pol = regk_sser_neg; | |
918 | gen_cfg.clk_dir = regk_sser_in; | |
919 | port->input = 1; | |
920 | port->output = 0; | |
921 | } | |
922 | else | |
923 | { | |
924 | gen_cfg.out_clk_pol = regk_sser_pos; | |
925 | port->input = 0; | |
926 | port->output = 1; | |
927 | gen_cfg.clk_dir = regk_sser_out; | |
928 | } | |
929 | break; | |
930 | case SSP_INBUFCHUNK: | |
931 | break; | |
932 | default: | |
933 | return_val = -1; | |
934 | } | |
935 | ||
936 | ||
e908dfc3 | 937 | if (port->started) { |
51533b61 | 938 | rec_cfg.rec_en = port->input; |
e908dfc3 | 939 | gen_cfg.en = (port->output | port->input); |
51533b61 MS |
940 | } |
941 | ||
942 | REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); | |
943 | REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); | |
944 | REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg); | |
945 | REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask); | |
946 | REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg); | |
947 | ||
e908dfc3 JN |
948 | |
949 | if (cmd == SSP_FRAME_SYNC && (arg & (WORD_SIZE_8 | WORD_SIZE_12 | | |
950 | WORD_SIZE_16 | WORD_SIZE_24 | WORD_SIZE_32))) { | |
951 | int en = gen_cfg.en; | |
952 | gen_cfg.en = 0; | |
953 | REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg); | |
954 | /* ##### Should DMA be stoped before we change dma size? */ | |
955 | DMA_WR_CMD(port->regi_dmain, dma_w_size); | |
956 | DMA_WR_CMD(port->regi_dmaout, dma_w_size); | |
957 | gen_cfg.en = en; | |
958 | REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg); | |
959 | } | |
960 | ||
51533b61 MS |
961 | spin_unlock_irq(&port->lock); |
962 | return return_val; | |
963 | } | |
964 | ||
e908dfc3 JN |
965 | /* NOTE: sync_serial_write does not support concurrency */ |
966 | static ssize_t sync_serial_write(struct file *file, const char *buf, | |
967 | size_t count, loff_t *ppos) | |
51533b61 | 968 | { |
d817be9c | 969 | int dev = iminor(file->f_path.dentry->d_inode); |
51533b61 | 970 | DECLARE_WAITQUEUE(wait, current); |
e908dfc3 JN |
971 | struct sync_port *port; |
972 | int trunc_count; | |
51533b61 | 973 | unsigned long flags; |
e908dfc3 JN |
974 | int bytes_free; |
975 | int out_buf_count; | |
51533b61 | 976 | |
e908dfc3 JN |
977 | unsigned char *rd_ptr; /* First allocated byte in the buffer */ |
978 | unsigned char *wr_ptr; /* First free byte in the buffer */ | |
979 | unsigned char *buf_stop_ptr; /* Last byte + 1 */ | |
980 | ||
981 | if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { | |
51533b61 MS |
982 | DEBUG(printk("Invalid minor %d\n", dev)); |
983 | return -ENODEV; | |
984 | } | |
985 | port = &ports[dev]; | |
986 | ||
e908dfc3 JN |
987 | /* |<- OUT_BUFFER_SIZE ->| |
988 | * |<- out_buf_count ->| | |
989 | * |<- trunc_count ->| ...->| | |
990 | * ______________________________________________________ | |
991 | * | free | data | free | | |
992 | * |_________|___________________|________________________| | |
993 | * ^ rd_ptr ^ wr_ptr | |
51533b61 | 994 | */ |
e908dfc3 JN |
995 | DEBUGWRITE(printk(KERN_DEBUG "W d%d c %lu a: %p c: %p\n", |
996 | port->port_nbr, count, port->active_tr_descr, | |
997 | port->catch_tr_descr)); | |
51533b61 MS |
998 | |
999 | /* Read variables that may be updated by interrupts */ | |
1000 | spin_lock_irqsave(&port->lock, flags); | |
e908dfc3 JN |
1001 | rd_ptr = port->out_rd_ptr; |
1002 | out_buf_count = port->out_buf_count; | |
51533b61 | 1003 | spin_unlock_irqrestore(&port->lock, flags); |
51533b61 | 1004 | |
e908dfc3 JN |
1005 | /* Check if resources are available */ |
1006 | if (port->tr_running && | |
1007 | ((port->use_dma && port->active_tr_descr == port->catch_tr_descr) || | |
1008 | out_buf_count >= OUT_BUFFER_SIZE)) { | |
1009 | DEBUGWRITE(printk(KERN_DEBUG "sser%d full\n", dev)); | |
1010 | return -EAGAIN; | |
1011 | } | |
1012 | ||
1013 | buf_stop_ptr = port->out_buffer + OUT_BUFFER_SIZE; | |
1014 | ||
1015 | /* Determine pointer to the first free byte, before copying. */ | |
1016 | wr_ptr = rd_ptr + out_buf_count; | |
1017 | if (wr_ptr >= buf_stop_ptr) | |
1018 | wr_ptr -= OUT_BUFFER_SIZE; | |
1019 | ||
1020 | /* If we wrap the ring buffer, let the user space program handle it by | |
1021 | * truncating the data. This could be more elegant, small buffer | |
1022 | * fragments may occur. | |
1023 | */ | |
1024 | bytes_free = OUT_BUFFER_SIZE - out_buf_count; | |
1025 | if (wr_ptr + bytes_free > buf_stop_ptr) | |
1026 | bytes_free = buf_stop_ptr - wr_ptr; | |
1027 | trunc_count = (count < bytes_free) ? count : bytes_free; | |
51533b61 | 1028 | |
e908dfc3 | 1029 | if (copy_from_user(wr_ptr, buf, trunc_count)) |
51533b61 MS |
1030 | return -EFAULT; |
1031 | ||
e908dfc3 JN |
1032 | DEBUGOUTBUF(printk(KERN_DEBUG "%-4d + %-4d = %-4d %p %p %p\n", |
1033 | out_buf_count, trunc_count, | |
1034 | port->out_buf_count, port->out_buffer, | |
1035 | wr_ptr, buf_stop_ptr)); | |
51533b61 MS |
1036 | |
1037 | /* Make sure transmitter/receiver is running */ | |
e908dfc3 | 1038 | if (!port->started) { |
51533b61 | 1039 | reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg); |
51533b61 MS |
1040 | reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg); |
1041 | cfg.en = regk_sser_yes; | |
51533b61 MS |
1042 | rec_cfg.rec_en = port->input; |
1043 | REG_WR(sser, port->regi_sser, rw_cfg, cfg); | |
51533b61 MS |
1044 | REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); |
1045 | port->started = 1; | |
1046 | } | |
1047 | ||
e908dfc3 JN |
1048 | /* Setup wait if blocking */ |
1049 | if (!(file->f_flags & O_NONBLOCK)) { | |
1050 | add_wait_queue(&port->out_wait_q, &wait); | |
1051 | set_current_state(TASK_INTERRUPTIBLE); | |
51533b61 MS |
1052 | } |
1053 | ||
51533b61 | 1054 | spin_lock_irqsave(&port->lock, flags); |
e908dfc3 JN |
1055 | port->out_buf_count += trunc_count; |
1056 | if (port->use_dma) { | |
1057 | start_dma_out(port, wr_ptr, trunc_count); | |
1058 | } else if (!port->tr_running) { | |
1059 | reg_sser_rw_intr_mask intr_mask; | |
1060 | intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask); | |
1061 | /* Start sender by writing data */ | |
1062 | send_word(port); | |
1063 | /* and enable transmitter ready IRQ */ | |
1064 | intr_mask.trdy = 1; | |
1065 | REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask); | |
51533b61 MS |
1066 | } |
1067 | spin_unlock_irqrestore(&port->lock, flags); | |
e908dfc3 JN |
1068 | |
1069 | /* Exit if non blocking */ | |
1070 | if (file->f_flags & O_NONBLOCK) { | |
1071 | DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu %08x\n", | |
1072 | port->port_nbr, trunc_count, | |
1073 | REG_RD_INT(dma, port->regi_dmaout, r_intr))); | |
1074 | return trunc_count; | |
1075 | } | |
1076 | ||
51533b61 MS |
1077 | schedule(); |
1078 | set_current_state(TASK_RUNNING); | |
1079 | remove_wait_queue(&port->out_wait_q, &wait); | |
e908dfc3 | 1080 | |
51533b61 | 1081 | if (signal_pending(current)) |
51533b61 | 1082 | return -EINTR; |
cbca6634 | 1083 | |
e908dfc3 JN |
1084 | DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu\n", |
1085 | port->port_nbr, trunc_count)); | |
1086 | return trunc_count; | |
51533b61 MS |
1087 | } |
1088 | ||
1089 | static ssize_t sync_serial_read(struct file * file, char * buf, | |
1090 | size_t count, loff_t *ppos) | |
1091 | { | |
d817be9c | 1092 | int dev = iminor(file->f_path.dentry->d_inode); |
51533b61 MS |
1093 | int avail; |
1094 | sync_port *port; | |
1095 | unsigned char* start; | |
1096 | unsigned char* end; | |
1097 | unsigned long flags; | |
1098 | ||
e908dfc3 | 1099 | if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) |
51533b61 MS |
1100 | { |
1101 | DEBUG(printk("Invalid minor %d\n", dev)); | |
1102 | return -ENODEV; | |
1103 | } | |
1104 | port = &ports[dev]; | |
1105 | ||
1106 | DEBUGREAD(printk("R%d c %d ri %lu wi %lu /%lu\n", dev, count, port->readp - port->flip, port->writep - port->flip, port->in_buffer_size)); | |
1107 | ||
1108 | if (!port->started) | |
1109 | { | |
1110 | reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg); | |
1111 | reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); | |
1112 | reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg); | |
1113 | cfg.en = regk_sser_yes; | |
1114 | tr_cfg.tr_en = regk_sser_yes; | |
1115 | rec_cfg.rec_en = regk_sser_yes; | |
1116 | REG_WR(sser, port->regi_sser, rw_cfg, cfg); | |
1117 | REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); | |
1118 | REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); | |
1119 | port->started = 1; | |
1120 | } | |
1121 | ||
51533b61 MS |
1122 | /* Calculate number of available bytes */ |
1123 | /* Save pointers to avoid that they are modified by interrupt */ | |
1124 | spin_lock_irqsave(&port->lock, flags); | |
1125 | start = (unsigned char*)port->readp; /* cast away volatile */ | |
1126 | end = (unsigned char*)port->writep; /* cast away volatile */ | |
1127 | spin_unlock_irqrestore(&port->lock, flags); | |
1128 | while ((start == end) && !port->full) /* No data */ | |
1129 | { | |
e908dfc3 | 1130 | DEBUGREAD(printk(KERN_DEBUG "&")); |
51533b61 | 1131 | if (file->f_flags & O_NONBLOCK) |
51533b61 | 1132 | return -EAGAIN; |
51533b61 MS |
1133 | |
1134 | interruptible_sleep_on(&port->in_wait_q); | |
1135 | if (signal_pending(current)) | |
51533b61 | 1136 | return -EINTR; |
e908dfc3 | 1137 | |
51533b61 MS |
1138 | spin_lock_irqsave(&port->lock, flags); |
1139 | start = (unsigned char*)port->readp; /* cast away volatile */ | |
1140 | end = (unsigned char*)port->writep; /* cast away volatile */ | |
1141 | spin_unlock_irqrestore(&port->lock, flags); | |
1142 | } | |
1143 | ||
1144 | /* Lazy read, never return wrapped data. */ | |
1145 | if (port->full) | |
1146 | avail = port->in_buffer_size; | |
1147 | else if (end > start) | |
1148 | avail = end - start; | |
1149 | else | |
1150 | avail = port->flip + port->in_buffer_size - start; | |
1151 | ||
1152 | count = count > avail ? avail : count; | |
1153 | if (copy_to_user(buf, start, count)) | |
1154 | return -EFAULT; | |
1155 | /* Disable interrupts while updating readp */ | |
1156 | spin_lock_irqsave(&port->lock, flags); | |
1157 | port->readp += count; | |
1158 | if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */ | |
1159 | port->readp = port->flip; | |
1160 | port->full = 0; | |
1161 | spin_unlock_irqrestore(&port->lock, flags); | |
1162 | DEBUGREAD(printk("r %d\n", count)); | |
1163 | return count; | |
1164 | } | |
1165 | ||
1166 | static void send_word(sync_port* port) | |
1167 | { | |
1168 | reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); | |
1169 | reg_sser_rw_tr_data tr_data = {0}; | |
1170 | ||
1171 | switch(tr_cfg.sample_size) | |
1172 | { | |
1173 | case 8: | |
e908dfc3 JN |
1174 | port->out_buf_count--; |
1175 | tr_data.data = *port->out_rd_ptr++; | |
51533b61 | 1176 | REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); |
e908dfc3 JN |
1177 | if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) |
1178 | port->out_rd_ptr = port->out_buffer; | |
51533b61 MS |
1179 | break; |
1180 | case 12: | |
1181 | { | |
e908dfc3 JN |
1182 | int data = (*port->out_rd_ptr++) << 8; |
1183 | data |= *port->out_rd_ptr++; | |
1184 | port->out_buf_count -= 2; | |
51533b61 MS |
1185 | tr_data.data = data; |
1186 | REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); | |
e908dfc3 JN |
1187 | if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) |
1188 | port->out_rd_ptr = port->out_buffer; | |
51533b61 MS |
1189 | } |
1190 | break; | |
1191 | case 16: | |
e908dfc3 JN |
1192 | port->out_buf_count -= 2; |
1193 | tr_data.data = *(unsigned short *)port->out_rd_ptr; | |
51533b61 | 1194 | REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); |
e908dfc3 JN |
1195 | port->out_rd_ptr += 2; |
1196 | if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) | |
1197 | port->out_rd_ptr = port->out_buffer; | |
51533b61 MS |
1198 | break; |
1199 | case 24: | |
e908dfc3 JN |
1200 | port->out_buf_count -= 3; |
1201 | tr_data.data = *(unsigned short *)port->out_rd_ptr; | |
51533b61 | 1202 | REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); |
e908dfc3 JN |
1203 | port->out_rd_ptr += 2; |
1204 | tr_data.data = *port->out_rd_ptr++; | |
51533b61 | 1205 | REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); |
e908dfc3 JN |
1206 | if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) |
1207 | port->out_rd_ptr = port->out_buffer; | |
51533b61 MS |
1208 | break; |
1209 | case 32: | |
e908dfc3 JN |
1210 | port->out_buf_count -= 4; |
1211 | tr_data.data = *(unsigned short *)port->out_rd_ptr; | |
51533b61 | 1212 | REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); |
e908dfc3 JN |
1213 | port->out_rd_ptr += 2; |
1214 | tr_data.data = *(unsigned short *)port->out_rd_ptr; | |
51533b61 | 1215 | REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); |
e908dfc3 JN |
1216 | port->out_rd_ptr += 2; |
1217 | if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) | |
1218 | port->out_rd_ptr = port->out_buffer; | |
51533b61 MS |
1219 | break; |
1220 | } | |
1221 | } | |
1222 | ||
e908dfc3 JN |
1223 | static void start_dma_out(struct sync_port *port, |
1224 | const char *data, int count) | |
51533b61 | 1225 | { |
e908dfc3 JN |
1226 | port->active_tr_descr->buf = (char *) virt_to_phys((char *) data); |
1227 | port->active_tr_descr->after = port->active_tr_descr->buf + count; | |
1228 | port->active_tr_descr->intr = 1; | |
1229 | ||
1230 | port->active_tr_descr->eol = 1; | |
1231 | port->prev_tr_descr->eol = 0; | |
1232 | ||
1233 | DEBUGTRDMA(printk(KERN_DEBUG "Inserting eolr:%p eol@:%p\n", | |
1234 | port->prev_tr_descr, port->active_tr_descr)); | |
1235 | port->prev_tr_descr = port->active_tr_descr; | |
1236 | port->active_tr_descr = phys_to_virt((int) port->active_tr_descr->next); | |
1237 | ||
1238 | if (!port->tr_running) { | |
1239 | reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, | |
1240 | rw_tr_cfg); | |
51533b61 | 1241 | |
e908dfc3 JN |
1242 | port->out_context.next = 0; |
1243 | port->out_context.saved_data = | |
1244 | (dma_descr_data *)virt_to_phys(port->prev_tr_descr); | |
1245 | port->out_context.saved_data_buf = port->prev_tr_descr->buf; | |
1246 | ||
1247 | DMA_START_CONTEXT(port->regi_dmaout, | |
1248 | virt_to_phys((char *)&port->out_context)); | |
1249 | ||
1250 | tr_cfg.tr_en = regk_sser_yes; | |
1251 | REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); | |
1252 | DEBUGTRDMA(printk(KERN_DEBUG "dma s\n");); | |
1253 | } else { | |
1254 | DMA_CONTINUE_DATA(port->regi_dmaout); | |
1255 | DEBUGTRDMA(printk(KERN_DEBUG "dma c\n");); | |
1256 | } | |
51533b61 | 1257 | |
e908dfc3 | 1258 | port->tr_running = 1; |
51533b61 MS |
1259 | } |
1260 | ||
e908dfc3 | 1261 | static void start_dma_in(sync_port *port) |
51533b61 MS |
1262 | { |
1263 | int i; | |
e908dfc3 | 1264 | char *buf; |
51533b61 MS |
1265 | port->writep = port->flip; |
1266 | ||
e908dfc3 | 1267 | if (port->writep > port->flip + port->in_buffer_size) { |
51533b61 MS |
1268 | panic("Offset too large in sync serial driver\n"); |
1269 | return; | |
1270 | } | |
1271 | buf = (char*)virt_to_phys(port->in_buffer); | |
e908dfc3 | 1272 | for (i = 0; i < NBR_IN_DESCR; i++) { |
51533b61 MS |
1273 | port->in_descr[i].buf = buf; |
1274 | port->in_descr[i].after = buf + port->inbufchunk; | |
1275 | port->in_descr[i].intr = 1; | |
1276 | port->in_descr[i].next = (dma_descr_data*)virt_to_phys(&port->in_descr[i+1]); | |
1277 | port->in_descr[i].buf = buf; | |
1278 | buf += port->inbufchunk; | |
1279 | } | |
1280 | /* Link the last descriptor to the first */ | |
1281 | port->in_descr[i-1].next = (dma_descr_data*)virt_to_phys(&port->in_descr[0]); | |
1282 | port->in_descr[i-1].eol = regk_sser_yes; | |
1283 | port->next_rx_desc = &port->in_descr[0]; | |
e908dfc3 | 1284 | port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR - 1]; |
51533b61 MS |
1285 | port->in_context.saved_data = (dma_descr_data*)virt_to_phys(&port->in_descr[0]); |
1286 | port->in_context.saved_data_buf = port->in_descr[0].buf; | |
1287 | DMA_START_CONTEXT(port->regi_dmain, virt_to_phys(&port->in_context)); | |
1288 | } | |
1289 | ||
1290 | #ifdef SYNC_SER_DMA | |
e908dfc3 | 1291 | static irqreturn_t tr_interrupt(int irq, void *dev_id) |
51533b61 MS |
1292 | { |
1293 | reg_dma_r_masked_intr masked; | |
1294 | reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes}; | |
e908dfc3 | 1295 | reg_dma_rw_stat stat; |
51533b61 | 1296 | int i; |
51533b61 | 1297 | int found = 0; |
e908dfc3 | 1298 | int stop_sser = 0; |
51533b61 | 1299 | |
e908dfc3 | 1300 | for (i = 0; i < NBR_PORTS; i++) { |
51533b61 | 1301 | sync_port *port = &ports[i]; |
e908dfc3 | 1302 | if (!port->enabled || !port->use_dma) |
51533b61 MS |
1303 | continue; |
1304 | ||
e908dfc3 | 1305 | /* IRQ active for the port? */ |
51533b61 | 1306 | masked = REG_RD(dma, port->regi_dmaout, r_masked_intr); |
e908dfc3 JN |
1307 | if (!masked.data) |
1308 | continue; | |
51533b61 | 1309 | |
e908dfc3 JN |
1310 | found = 1; |
1311 | ||
1312 | /* Check if we should stop the DMA transfer */ | |
1313 | stat = REG_RD(dma, port->regi_dmaout, rw_stat); | |
1314 | if (stat.list_state == regk_dma_data_at_eol) | |
1315 | stop_sser = 1; | |
1316 | ||
1317 | /* Clear IRQ */ | |
1318 | REG_WR(dma, port->regi_dmaout, rw_ack_intr, ack_intr); | |
1319 | ||
1320 | if (!stop_sser) { | |
1321 | /* The DMA has completed a descriptor, EOL was not | |
1322 | * encountered, so step relevant descriptor and | |
1323 | * datapointers forward. */ | |
1324 | int sent; | |
1325 | sent = port->catch_tr_descr->after - | |
1326 | port->catch_tr_descr->buf; | |
1327 | DEBUGTXINT(printk(KERN_DEBUG "%-4d - %-4d = %-4d\t" | |
1328 | "in descr %p (ac: %p)\n", | |
1329 | port->out_buf_count, sent, | |
1330 | port->out_buf_count - sent, | |
1331 | port->catch_tr_descr, | |
1332 | port->active_tr_descr);); | |
1333 | port->out_buf_count -= sent; | |
1334 | port->catch_tr_descr = | |
1335 | phys_to_virt((int) port->catch_tr_descr->next); | |
1336 | port->out_rd_ptr = | |
1337 | phys_to_virt((int) port->catch_tr_descr->buf); | |
1338 | } else { | |
1339 | int i, sent; | |
1340 | /* EOL handler. | |
1341 | * Note that if an EOL was encountered during the irq | |
1342 | * locked section of sync_ser_write the DMA will be | |
1343 | * restarted and the eol flag will be cleared. | |
1344 | * The remaining descriptors will be traversed by | |
1345 | * the descriptor interrupts as usual. | |
1346 | */ | |
1347 | i = 0; | |
1348 | while (!port->catch_tr_descr->eol) { | |
1349 | sent = port->catch_tr_descr->after - | |
1350 | port->catch_tr_descr->buf; | |
1351 | DEBUGOUTBUF(printk(KERN_DEBUG | |
1352 | "traversing descr %p -%d (%d)\n", | |
1353 | port->catch_tr_descr, | |
1354 | sent, | |
1355 | port->out_buf_count)); | |
1356 | port->out_buf_count -= sent; | |
1357 | port->catch_tr_descr = phys_to_virt( | |
1358 | (int)port->catch_tr_descr->next); | |
1359 | i++; | |
1360 | if (i >= NBR_OUT_DESCR) { | |
1361 | /* TODO: Reset and recover */ | |
1362 | panic("sync_serial: missing eol"); | |
1363 | } | |
51533b61 | 1364 | } |
e908dfc3 JN |
1365 | sent = port->catch_tr_descr->after - |
1366 | port->catch_tr_descr->buf; | |
1367 | DEBUGOUTBUF(printk(KERN_DEBUG | |
1368 | "eol at descr %p -%d (%d)\n", | |
1369 | port->catch_tr_descr, | |
1370 | sent, | |
1371 | port->out_buf_count)); | |
1372 | ||
1373 | port->out_buf_count -= sent; | |
1374 | ||
1375 | /* Update read pointer to first free byte, we | |
1376 | * may already be writing data there. */ | |
1377 | port->out_rd_ptr = | |
1378 | phys_to_virt((int) port->catch_tr_descr->after); | |
1379 | if (port->out_rd_ptr > port->out_buffer + | |
1380 | OUT_BUFFER_SIZE) | |
1381 | port->out_rd_ptr = port->out_buffer; | |
1382 | ||
1383 | reg_sser_rw_tr_cfg tr_cfg = | |
1384 | REG_RD(sser, port->regi_sser, rw_tr_cfg); | |
1385 | DEBUGTXINT(printk(KERN_DEBUG | |
1386 | "tr_int DMA stop %d, set catch @ %p\n", | |
1387 | port->out_buf_count, | |
1388 | port->active_tr_descr)); | |
1389 | if (port->out_buf_count != 0) | |
1390 | printk(KERN_CRIT "sync_ser: buffer not " | |
1391 | "empty after eol.\n"); | |
1392 | port->catch_tr_descr = port->active_tr_descr; | |
1393 | port->tr_running = 0; | |
1394 | tr_cfg.tr_en = regk_sser_no; | |
1395 | REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); | |
51533b61 | 1396 | } |
e908dfc3 JN |
1397 | /* wake up the waiting process */ |
1398 | wake_up_interruptible(&port->out_wait_q); | |
51533b61 MS |
1399 | } |
1400 | return IRQ_RETVAL(found); | |
1401 | } /* tr_interrupt */ | |
1402 | ||
e908dfc3 | 1403 | static irqreturn_t rx_interrupt(int irq, void *dev_id) |
51533b61 MS |
1404 | { |
1405 | reg_dma_r_masked_intr masked; | |
1406 | reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes}; | |
1407 | ||
1408 | int i; | |
1409 | int found = 0; | |
1410 | ||
e908dfc3 | 1411 | for (i = 0; i < NBR_PORTS; i++) |
51533b61 MS |
1412 | { |
1413 | sync_port *port = &ports[i]; | |
1414 | ||
1415 | if (!port->enabled || !port->use_dma ) | |
1416 | continue; | |
1417 | ||
1418 | masked = REG_RD(dma, port->regi_dmain, r_masked_intr); | |
1419 | ||
1420 | if (masked.data) /* Descriptor interrupt */ | |
1421 | { | |
1422 | found = 1; | |
1423 | while (REG_RD(dma, port->regi_dmain, rw_data) != | |
1424 | virt_to_phys(port->next_rx_desc)) { | |
e908dfc3 | 1425 | DEBUGRXINT(printk(KERN_DEBUG "!")); |
51533b61 MS |
1426 | if (port->writep + port->inbufchunk > port->flip + port->in_buffer_size) { |
1427 | int first_size = port->flip + port->in_buffer_size - port->writep; | |
1428 | memcpy((char*)port->writep, phys_to_virt((unsigned)port->next_rx_desc->buf), first_size); | |
1429 | memcpy(port->flip, phys_to_virt((unsigned)port->next_rx_desc->buf+first_size), port->inbufchunk - first_size); | |
1430 | port->writep = port->flip + port->inbufchunk - first_size; | |
1431 | } else { | |
1432 | memcpy((char*)port->writep, | |
1433 | phys_to_virt((unsigned)port->next_rx_desc->buf), | |
1434 | port->inbufchunk); | |
1435 | port->writep += port->inbufchunk; | |
1436 | if (port->writep >= port->flip + port->in_buffer_size) | |
1437 | port->writep = port->flip; | |
1438 | } | |
1439 | if (port->writep == port->readp) | |
1440 | { | |
1441 | port->full = 1; | |
1442 | } | |
1443 | ||
e908dfc3 JN |
1444 | port->next_rx_desc->eol = 1; |
1445 | port->prev_rx_desc->eol = 0; | |
1446 | /* Cache bug workaround */ | |
1447 | flush_dma_descr(port->prev_rx_desc, 0); | |
1448 | port->prev_rx_desc = port->next_rx_desc; | |
51533b61 | 1449 | port->next_rx_desc = phys_to_virt((unsigned)port->next_rx_desc->next); |
e908dfc3 JN |
1450 | /* Cache bug workaround */ |
1451 | flush_dma_descr(port->prev_rx_desc, 1); | |
1452 | /* wake up the waiting process */ | |
1453 | wake_up_interruptible(&port->in_wait_q); | |
51533b61 MS |
1454 | DMA_CONTINUE(port->regi_dmain); |
1455 | REG_WR(dma, port->regi_dmain, rw_ack_intr, ack_intr); | |
1456 | ||
1457 | } | |
1458 | } | |
1459 | } | |
1460 | return IRQ_RETVAL(found); | |
1461 | } /* rx_interrupt */ | |
1462 | #endif /* SYNC_SER_DMA */ | |
1463 | ||
1464 | #ifdef SYNC_SER_MANUAL | |
e908dfc3 | 1465 | static irqreturn_t manual_interrupt(int irq, void *dev_id) |
51533b61 MS |
1466 | { |
1467 | int i; | |
1468 | int found = 0; | |
1469 | reg_sser_r_masked_intr masked; | |
1470 | ||
e908dfc3 | 1471 | for (i = 0; i < NBR_PORTS; i++) |
51533b61 | 1472 | { |
e908dfc3 | 1473 | sync_port *port = &ports[i]; |
51533b61 MS |
1474 | |
1475 | if (!port->enabled || port->use_dma) | |
1476 | { | |
1477 | continue; | |
1478 | } | |
1479 | ||
1480 | masked = REG_RD(sser, port->regi_sser, r_masked_intr); | |
1481 | if (masked.rdav) /* Data received? */ | |
1482 | { | |
1483 | reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg); | |
1484 | reg_sser_r_rec_data data = REG_RD(sser, port->regi_sser, r_rec_data); | |
1485 | found = 1; | |
1486 | /* Read data */ | |
1487 | switch(rec_cfg.sample_size) | |
1488 | { | |
1489 | case 8: | |
1490 | *port->writep++ = data.data & 0xff; | |
1491 | break; | |
1492 | case 12: | |
1493 | *port->writep = (data.data & 0x0ff0) >> 4; | |
1494 | *(port->writep + 1) = data.data & 0x0f; | |
1495 | port->writep+=2; | |
1496 | break; | |
1497 | case 16: | |
1498 | *(unsigned short*)port->writep = data.data; | |
1499 | port->writep+=2; | |
1500 | break; | |
1501 | case 24: | |
1502 | *(unsigned int*)port->writep = data.data; | |
1503 | port->writep+=3; | |
1504 | break; | |
1505 | case 32: | |
1506 | *(unsigned int*)port->writep = data.data; | |
1507 | port->writep+=4; | |
1508 | break; | |
1509 | } | |
1510 | ||
1511 | if (port->writep >= port->flip + port->in_buffer_size) /* Wrap? */ | |
1512 | port->writep = port->flip; | |
1513 | if (port->writep == port->readp) { | |
1514 | /* receive buffer overrun, discard oldest data | |
1515 | */ | |
1516 | port->readp++; | |
1517 | if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */ | |
1518 | port->readp = port->flip; | |
1519 | } | |
1520 | if (sync_data_avail(port) >= port->inbufchunk) | |
1521 | wake_up_interruptible(&port->in_wait_q); /* Wake up application */ | |
1522 | } | |
1523 | ||
1524 | if (masked.trdy) /* Transmitter ready? */ | |
1525 | { | |
1526 | found = 1; | |
e908dfc3 | 1527 | if (port->out_buf_count > 0) /* More data to send */ |
51533b61 MS |
1528 | send_word(port); |
1529 | else /* transmission finished */ | |
1530 | { | |
1531 | reg_sser_rw_intr_mask intr_mask; | |
1532 | intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask); | |
1533 | intr_mask.trdy = 0; | |
1534 | REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask); | |
1535 | wake_up_interruptible(&port->out_wait_q); /* Wake up application */ | |
1536 | } | |
1537 | } | |
1538 | } | |
1539 | return IRQ_RETVAL(found); | |
1540 | } | |
1541 | #endif | |
1542 | ||
1543 | module_init(etrax_sync_serial_init); |