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Merge tag 'iwlwifi-for-john-2014-11-23' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / arch / cris / arch-v32 / drivers / sync_serial.c
1 /*
2 * Simple synchronous serial port driver for ETRAX FS and Artpec-3.
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>
12 #include <linux/types.h>
13 #include <linux/errno.h>
14 #include <linux/major.h>
15 #include <linux/sched.h>
16 #include <linux/mutex.h>
17 #include <linux/interrupt.h>
18 #include <linux/poll.h>
19 #include <linux/init.h>
20 #include <linux/timer.h>
21 #include <linux/spinlock.h>
22 #include <linux/wait.h>
23
24 #include <asm/io.h>
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>
34 #include <asm/sync_serial.h>
35
36
37 /* The receiver is a bit tricky because 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
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
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)
85 #define DEBUGTRDMA(x)
86 #define DEBUGOUTBUF(x)
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
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
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;
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;
129 int full;
130
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)));
139 dma_descr_context in_context __attribute__ ((__aligned__(32)));
140 dma_descr_data out_descr[NBR_OUT_DESCR]
141 __attribute__ ((__aligned__(16)));
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 DEFINE_MUTEX(sync_serial_mutex);
150 static int etrax_sync_serial_init(void);
151 static void initialize_port(int portnbr);
152 static inline int sync_data_avail(struct sync_port *port);
153
154 static int sync_serial_open(struct inode *, struct file*);
155 static int sync_serial_release(struct inode*, struct file*);
156 static unsigned int sync_serial_poll(struct file *filp, poll_table *wait);
157
158 static int sync_serial_ioctl(struct file *,
159 unsigned int cmd, unsigned long arg);
160 static ssize_t sync_serial_write(struct file * file, const char * buf,
161 size_t count, loff_t *ppos);
162 static ssize_t sync_serial_read(struct file *file, char *buf,
163 size_t count, loff_t *ppos);
164
165 #if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
166 defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
167 (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
168 defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))
169 #define SYNC_SER_DMA
170 #endif
171
172 static void send_word(sync_port* port);
173 static void start_dma_out(struct sync_port *port, const char *data, int count);
174 static void start_dma_in(sync_port* port);
175 #ifdef SYNC_SER_DMA
176 static irqreturn_t tr_interrupt(int irq, void *dev_id);
177 static irqreturn_t rx_interrupt(int irq, void *dev_id);
178 #endif
179
180 #if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
181 !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
182 (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
183 !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))
184 #define SYNC_SER_MANUAL
185 #endif
186 #ifdef SYNC_SER_MANUAL
187 static irqreturn_t manual_interrupt(int irq, void *dev_id);
188 #endif
189
190 #ifdef CONFIG_ETRAXFS /* ETRAX FS */
191 #define OUT_DMA_NBR 4
192 #define IN_DMA_NBR 5
193 #define PINMUX_SSER pinmux_sser0
194 #define SYNCSER_INST regi_sser0
195 #define SYNCSER_INTR_VECT SSER0_INTR_VECT
196 #define OUT_DMA_INST regi_dma4
197 #define IN_DMA_INST regi_dma5
198 #define DMA_OUT_INTR_VECT DMA4_INTR_VECT
199 #define DMA_IN_INTR_VECT DMA5_INTR_VECT
200 #define REQ_DMA_SYNCSER dma_sser0
201 #else /* Artpec-3 */
202 #define OUT_DMA_NBR 6
203 #define IN_DMA_NBR 7
204 #define PINMUX_SSER pinmux_sser
205 #define SYNCSER_INST regi_sser
206 #define SYNCSER_INTR_VECT SSER_INTR_VECT
207 #define OUT_DMA_INST regi_dma6
208 #define IN_DMA_INST regi_dma7
209 #define DMA_OUT_INTR_VECT DMA6_INTR_VECT
210 #define DMA_IN_INTR_VECT DMA7_INTR_VECT
211 #define REQ_DMA_SYNCSER dma_sser
212 #endif
213
214 /* The ports */
215 static struct sync_port ports[]=
216 {
217 {
218 .regi_sser = SYNCSER_INST,
219 .regi_dmaout = OUT_DMA_INST,
220 .regi_dmain = IN_DMA_INST,
221 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)
222 .use_dma = 1,
223 #else
224 .use_dma = 0,
225 #endif
226 }
227 #ifdef CONFIG_ETRAXFS
228 ,
229
230 {
231 .regi_sser = regi_sser1,
232 .regi_dmaout = regi_dma6,
233 .regi_dmain = regi_dma7,
234 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)
235 .use_dma = 1,
236 #else
237 .use_dma = 0,
238 #endif
239 }
240 #endif
241 };
242
243 #define NBR_PORTS ARRAY_SIZE(ports)
244
245 static const struct file_operations sync_serial_fops = {
246 .owner = THIS_MODULE,
247 .write = sync_serial_write,
248 .read = sync_serial_read,
249 .poll = sync_serial_poll,
250 .unlocked_ioctl = sync_serial_ioctl,
251 .open = sync_serial_open,
252 .release = sync_serial_release,
253 .llseek = noop_llseek,
254 };
255
256 static int __init etrax_sync_serial_init(void)
257 {
258 ports[0].enabled = 0;
259 #ifdef CONFIG_ETRAXFS
260 ports[1].enabled = 0;
261 #endif
262 if (register_chrdev(SYNC_SERIAL_MAJOR, "sync serial",
263 &sync_serial_fops) < 0) {
264 printk(KERN_WARNING
265 "Unable to get major for synchronous serial port\n");
266 return -EBUSY;
267 }
268
269 /* Initialize Ports */
270 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
271 if (crisv32_pinmux_alloc_fixed(PINMUX_SSER)) {
272 printk(KERN_WARNING
273 "Unable to alloc pins for synchronous serial port 0\n");
274 return -EIO;
275 }
276 ports[0].enabled = 1;
277 initialize_port(0);
278 #endif
279
280 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
281 if (crisv32_pinmux_alloc_fixed(pinmux_sser1)) {
282 printk(KERN_WARNING
283 "Unable to alloc pins for synchronous serial port 0\n");
284 return -EIO;
285 }
286 ports[1].enabled = 1;
287 initialize_port(1);
288 #endif
289
290 #ifdef CONFIG_ETRAXFS
291 printk(KERN_INFO "ETRAX FS synchronous serial port driver\n");
292 #else
293 printk(KERN_INFO "Artpec-3 synchronous serial port driver\n");
294 #endif
295 return 0;
296 }
297
298 static void __init initialize_port(int portnbr)
299 {
300 int __attribute__((unused)) i;
301 struct sync_port *port = &ports[portnbr];
302 reg_sser_rw_cfg cfg = {0};
303 reg_sser_rw_frm_cfg frm_cfg = {0};
304 reg_sser_rw_tr_cfg tr_cfg = {0};
305 reg_sser_rw_rec_cfg rec_cfg = {0};
306
307 DEBUG(printk(KERN_DEBUG "Init sync serial port %d\n", portnbr));
308
309 port->port_nbr = portnbr;
310 port->init_irqs = 1;
311
312 port->out_rd_ptr = port->out_buffer;
313 port->out_buf_count = 0;
314
315 port->output = 1;
316 port->input = 0;
317
318 port->readp = port->flip;
319 port->writep = port->flip;
320 port->in_buffer_size = IN_BUFFER_SIZE;
321 port->inbufchunk = IN_DESCR_SIZE;
322 port->next_rx_desc = &port->in_descr[0];
323 port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR-1];
324 port->prev_rx_desc->eol = 1;
325
326 init_waitqueue_head(&port->out_wait_q);
327 init_waitqueue_head(&port->in_wait_q);
328
329 spin_lock_init(&port->lock);
330
331 cfg.out_clk_src = regk_sser_intern_clk;
332 cfg.out_clk_pol = regk_sser_pos;
333 cfg.clk_od_mode = regk_sser_no;
334 cfg.clk_dir = regk_sser_out;
335 cfg.gate_clk = regk_sser_no;
336 cfg.base_freq = regk_sser_f29_493;
337 cfg.clk_div = 256;
338 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
339
340 frm_cfg.wordrate = DEFAULT_WORD_RATE;
341 frm_cfg.type = regk_sser_edge;
342 frm_cfg.frame_pin_dir = regk_sser_out;
343 frm_cfg.frame_pin_use = regk_sser_frm;
344 frm_cfg.status_pin_dir = regk_sser_in;
345 frm_cfg.status_pin_use = regk_sser_hold;
346 frm_cfg.out_on = regk_sser_tr;
347 frm_cfg.tr_delay = 1;
348 REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg);
349
350 tr_cfg.urun_stop = regk_sser_no;
351 tr_cfg.sample_size = 7;
352 tr_cfg.sh_dir = regk_sser_msbfirst;
353 tr_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no;
354 #if 0
355 tr_cfg.rate_ctrl = regk_sser_bulk;
356 tr_cfg.data_pin_use = regk_sser_dout;
357 #else
358 tr_cfg.rate_ctrl = regk_sser_iso;
359 tr_cfg.data_pin_use = regk_sser_dout;
360 #endif
361 tr_cfg.bulk_wspace = 1;
362 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
363
364 rec_cfg.sample_size = 7;
365 rec_cfg.sh_dir = regk_sser_msbfirst;
366 rec_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no;
367 rec_cfg.fifo_thr = regk_sser_inf;
368 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
369
370 #ifdef SYNC_SER_DMA
371 /* Setup the descriptor ring for dma out/transmit. */
372 for (i = 0; i < NBR_OUT_DESCR; i++) {
373 port->out_descr[i].wait = 0;
374 port->out_descr[i].intr = 1;
375 port->out_descr[i].eol = 0;
376 port->out_descr[i].out_eop = 0;
377 port->out_descr[i].next =
378 (dma_descr_data *)virt_to_phys(&port->out_descr[i+1]);
379 }
380
381 /* Create a ring from the list. */
382 port->out_descr[NBR_OUT_DESCR-1].next =
383 (dma_descr_data *)virt_to_phys(&port->out_descr[0]);
384
385 /* Setup context for traversing the ring. */
386 port->active_tr_descr = &port->out_descr[0];
387 port->prev_tr_descr = &port->out_descr[NBR_OUT_DESCR-1];
388 port->catch_tr_descr = &port->out_descr[0];
389 #endif
390 }
391
392 static inline int sync_data_avail(struct sync_port *port)
393 {
394 int avail;
395 unsigned char *start;
396 unsigned char *end;
397
398 start = (unsigned char*)port->readp; /* cast away volatile */
399 end = (unsigned char*)port->writep; /* cast away volatile */
400 /* 0123456789 0123456789
401 * ----- - -----
402 * ^rp ^wp ^wp ^rp
403 */
404
405 if (end >= start)
406 avail = end - start;
407 else
408 avail = port->in_buffer_size - (start - end);
409 return avail;
410 }
411
412 static inline int sync_data_avail_to_end(struct sync_port *port)
413 {
414 int avail;
415 unsigned char *start;
416 unsigned char *end;
417
418 start = (unsigned char*)port->readp; /* cast away volatile */
419 end = (unsigned char*)port->writep; /* cast away volatile */
420 /* 0123456789 0123456789
421 * ----- -----
422 * ^rp ^wp ^wp ^rp
423 */
424
425 if (end >= start)
426 avail = end - start;
427 else
428 avail = port->flip + port->in_buffer_size - start;
429 return avail;
430 }
431
432 static int sync_serial_open(struct inode *inode, struct file *file)
433 {
434 int dev = iminor(inode);
435 int ret = -EBUSY;
436 sync_port *port;
437 reg_dma_rw_cfg cfg = {.en = regk_dma_yes};
438 reg_dma_rw_intr_mask intr_mask = {.data = regk_dma_yes};
439
440 mutex_lock(&sync_serial_mutex);
441 DEBUG(printk(KERN_DEBUG "Open sync serial port %d\n", dev));
442
443 if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
444 {
445 DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
446 ret = -ENODEV;
447 goto out;
448 }
449 port = &ports[dev];
450 /* Allow open this device twice (assuming one reader and one writer) */
451 if (port->busy == 2)
452 {
453 DEBUG(printk(KERN_DEBUG "Device is busy.. \n"));
454 goto out;
455 }
456
457
458 if (port->init_irqs) {
459 if (port->use_dma) {
460 if (port == &ports[0]) {
461 #ifdef SYNC_SER_DMA
462 if (request_irq(DMA_OUT_INTR_VECT,
463 tr_interrupt,
464 0,
465 "synchronous serial 0 dma tr",
466 &ports[0])) {
467 printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
468 goto out;
469 } else if (request_irq(DMA_IN_INTR_VECT,
470 rx_interrupt,
471 0,
472 "synchronous serial 1 dma rx",
473 &ports[0])) {
474 free_irq(DMA_OUT_INTR_VECT, &port[0]);
475 printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
476 goto out;
477 } else if (crisv32_request_dma(OUT_DMA_NBR,
478 "synchronous serial 0 dma tr",
479 DMA_VERBOSE_ON_ERROR,
480 0,
481 REQ_DMA_SYNCSER)) {
482 free_irq(DMA_OUT_INTR_VECT, &port[0]);
483 free_irq(DMA_IN_INTR_VECT, &port[0]);
484 printk(KERN_CRIT "Can't allocate sync serial port 0 TX DMA channel");
485 goto out;
486 } else if (crisv32_request_dma(IN_DMA_NBR,
487 "synchronous serial 0 dma rec",
488 DMA_VERBOSE_ON_ERROR,
489 0,
490 REQ_DMA_SYNCSER)) {
491 crisv32_free_dma(OUT_DMA_NBR);
492 free_irq(DMA_OUT_INTR_VECT, &port[0]);
493 free_irq(DMA_IN_INTR_VECT, &port[0]);
494 printk(KERN_CRIT "Can't allocate sync serial port 1 RX DMA channel");
495 goto out;
496 }
497 #endif
498 }
499 #ifdef CONFIG_ETRAXFS
500 else if (port == &ports[1]) {
501 #ifdef SYNC_SER_DMA
502 if (request_irq(DMA6_INTR_VECT,
503 tr_interrupt,
504 0,
505 "synchronous serial 1 dma tr",
506 &ports[1])) {
507 printk(KERN_CRIT "Can't allocate sync serial port 1 IRQ");
508 goto out;
509 } else if (request_irq(DMA7_INTR_VECT,
510 rx_interrupt,
511 0,
512 "synchronous serial 1 dma rx",
513 &ports[1])) {
514 free_irq(DMA6_INTR_VECT, &ports[1]);
515 printk(KERN_CRIT "Can't allocate sync serial port 3 IRQ");
516 goto out;
517 } else if (crisv32_request_dma(
518 SYNC_SER1_TX_DMA_NBR,
519 "synchronous serial 1 dma tr",
520 DMA_VERBOSE_ON_ERROR,
521 0,
522 dma_sser1)) {
523 free_irq(DMA6_INTR_VECT, &ports[1]);
524 free_irq(DMA7_INTR_VECT, &ports[1]);
525 printk(KERN_CRIT "Can't allocate sync serial port 3 TX DMA channel");
526 goto out;
527 } else if (crisv32_request_dma(
528 SYNC_SER1_RX_DMA_NBR,
529 "synchronous serial 3 dma rec",
530 DMA_VERBOSE_ON_ERROR,
531 0,
532 dma_sser1)) {
533 crisv32_free_dma(SYNC_SER1_TX_DMA_NBR);
534 free_irq(DMA6_INTR_VECT, &ports[1]);
535 free_irq(DMA7_INTR_VECT, &ports[1]);
536 printk(KERN_CRIT "Can't allocate sync serial port 3 RX DMA channel");
537 goto out;
538 }
539 #endif
540 }
541 #endif
542 /* Enable DMAs */
543 REG_WR(dma, port->regi_dmain, rw_cfg, cfg);
544 REG_WR(dma, port->regi_dmaout, rw_cfg, cfg);
545 /* Enable DMA IRQs */
546 REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask);
547 REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask);
548 /* Set up wordsize = 1 for DMAs. */
549 DMA_WR_CMD (port->regi_dmain, regk_dma_set_w_size1);
550 DMA_WR_CMD (port->regi_dmaout, regk_dma_set_w_size1);
551
552 start_dma_in(port);
553 port->init_irqs = 0;
554 } else { /* !port->use_dma */
555 #ifdef SYNC_SER_MANUAL
556 if (port == &ports[0]) {
557 if (request_irq(SYNCSER_INTR_VECT,
558 manual_interrupt,
559 0,
560 "synchronous serial manual irq",
561 &ports[0])) {
562 printk("Can't allocate sync serial manual irq");
563 goto out;
564 }
565 }
566 #ifdef CONFIG_ETRAXFS
567 else if (port == &ports[1]) {
568 if (request_irq(SSER1_INTR_VECT,
569 manual_interrupt,
570 0,
571 "synchronous serial manual irq",
572 &ports[1])) {
573 printk(KERN_CRIT "Can't allocate sync serial manual irq");
574 goto out;
575 }
576 }
577 #endif
578 port->init_irqs = 0;
579 #else
580 panic("sync_serial: Manual mode not supported.\n");
581 #endif /* SYNC_SER_MANUAL */
582 }
583
584 } /* port->init_irqs */
585
586 port->busy++;
587 ret = 0;
588 out:
589 mutex_unlock(&sync_serial_mutex);
590 return ret;
591 }
592
593 static int sync_serial_release(struct inode *inode, struct file *file)
594 {
595 int dev = iminor(inode);
596 sync_port *port;
597
598 if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
599 {
600 DEBUG(printk("Invalid minor %d\n", dev));
601 return -ENODEV;
602 }
603 port = &ports[dev];
604 if (port->busy)
605 port->busy--;
606 if (!port->busy)
607 /* XXX */ ;
608 return 0;
609 }
610
611 static unsigned int sync_serial_poll(struct file *file, poll_table *wait)
612 {
613 int dev = iminor(file_inode(file));
614 unsigned int mask = 0;
615 sync_port *port;
616 DEBUGPOLL( static unsigned int prev_mask = 0; );
617
618 port = &ports[dev];
619
620 if (!port->started) {
621 reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
622 reg_sser_rw_rec_cfg rec_cfg =
623 REG_RD(sser, port->regi_sser, rw_rec_cfg);
624 cfg.en = regk_sser_yes;
625 rec_cfg.rec_en = port->input;
626 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
627 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
628 port->started = 1;
629 }
630
631 poll_wait(file, &port->out_wait_q, wait);
632 poll_wait(file, &port->in_wait_q, wait);
633
634 /* No active transfer, descriptors are available */
635 if (port->output && !port->tr_running)
636 mask |= POLLOUT | POLLWRNORM;
637
638 /* Descriptor and buffer space available. */
639 if (port->output &&
640 port->active_tr_descr != port->catch_tr_descr &&
641 port->out_buf_count < OUT_BUFFER_SIZE)
642 mask |= POLLOUT | POLLWRNORM;
643
644 /* At least an inbufchunk of data */
645 if (port->input && sync_data_avail(port) >= port->inbufchunk)
646 mask |= POLLIN | POLLRDNORM;
647
648 DEBUGPOLL(if (mask != prev_mask)
649 printk("sync_serial_poll: mask 0x%08X %s %s\n", mask,
650 mask&POLLOUT?"POLLOUT":"", mask&POLLIN?"POLLIN":"");
651 prev_mask = mask;
652 );
653 return mask;
654 }
655
656 static int sync_serial_ioctl(struct file *file,
657 unsigned int cmd, unsigned long arg)
658 {
659 int return_val = 0;
660 int dma_w_size = regk_dma_set_w_size1;
661 int dev = iminor(file_inode(file));
662 sync_port *port;
663 reg_sser_rw_tr_cfg tr_cfg;
664 reg_sser_rw_rec_cfg rec_cfg;
665 reg_sser_rw_frm_cfg frm_cfg;
666 reg_sser_rw_cfg gen_cfg;
667 reg_sser_rw_intr_mask intr_mask;
668
669 if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
670 {
671 DEBUG(printk("Invalid minor %d\n", dev));
672 return -1;
673 }
674 port = &ports[dev];
675 spin_lock_irq(&port->lock);
676
677 tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
678 rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
679 frm_cfg = REG_RD(sser, port->regi_sser, rw_frm_cfg);
680 gen_cfg = REG_RD(sser, port->regi_sser, rw_cfg);
681 intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
682
683 switch(cmd)
684 {
685 case SSP_SPEED:
686 if (GET_SPEED(arg) == CODEC)
687 {
688 unsigned int freq;
689
690 gen_cfg.base_freq = regk_sser_f32;
691
692 /* Clock divider will internally be
693 * gen_cfg.clk_div + 1.
694 */
695
696 freq = GET_FREQ(arg);
697 switch (freq) {
698 case FREQ_32kHz:
699 case FREQ_64kHz:
700 case FREQ_128kHz:
701 case FREQ_256kHz:
702 gen_cfg.clk_div = 125 *
703 (1 << (freq - FREQ_256kHz)) - 1;
704 break;
705 case FREQ_512kHz:
706 gen_cfg.clk_div = 62;
707 break;
708 case FREQ_1MHz:
709 case FREQ_2MHz:
710 case FREQ_4MHz:
711 gen_cfg.clk_div = 8 * (1 << freq) - 1;
712 break;
713 }
714 } else {
715 gen_cfg.base_freq = regk_sser_f29_493;
716 switch (GET_SPEED(arg)) {
717 case SSP150:
718 gen_cfg.clk_div = 29493000 / (150 * 8) - 1;
719 break;
720 case SSP300:
721 gen_cfg.clk_div = 29493000 / (300 * 8) - 1;
722 break;
723 case SSP600:
724 gen_cfg.clk_div = 29493000 / (600 * 8) - 1;
725 break;
726 case SSP1200:
727 gen_cfg.clk_div = 29493000 / (1200 * 8) - 1;
728 break;
729 case SSP2400:
730 gen_cfg.clk_div = 29493000 / (2400 * 8) - 1;
731 break;
732 case SSP4800:
733 gen_cfg.clk_div = 29493000 / (4800 * 8) - 1;
734 break;
735 case SSP9600:
736 gen_cfg.clk_div = 29493000 / (9600 * 8) - 1;
737 break;
738 case SSP19200:
739 gen_cfg.clk_div = 29493000 / (19200 * 8) - 1;
740 break;
741 case SSP28800:
742 gen_cfg.clk_div = 29493000 / (28800 * 8) - 1;
743 break;
744 case SSP57600:
745 gen_cfg.clk_div = 29493000 / (57600 * 8) - 1;
746 break;
747 case SSP115200:
748 gen_cfg.clk_div = 29493000 / (115200 * 8) - 1;
749 break;
750 case SSP230400:
751 gen_cfg.clk_div = 29493000 / (230400 * 8) - 1;
752 break;
753 case SSP460800:
754 gen_cfg.clk_div = 29493000 / (460800 * 8) - 1;
755 break;
756 case SSP921600:
757 gen_cfg.clk_div = 29493000 / (921600 * 8) - 1;
758 break;
759 case SSP3125000:
760 gen_cfg.base_freq = regk_sser_f100;
761 gen_cfg.clk_div = 100000000 / (3125000 * 8) - 1;
762 break;
763
764 }
765 }
766 frm_cfg.wordrate = GET_WORD_RATE(arg);
767
768 break;
769 case SSP_MODE:
770 switch(arg)
771 {
772 case MASTER_OUTPUT:
773 port->output = 1;
774 port->input = 0;
775 frm_cfg.out_on = regk_sser_tr;
776 frm_cfg.frame_pin_dir = regk_sser_out;
777 gen_cfg.clk_dir = regk_sser_out;
778 break;
779 case SLAVE_OUTPUT:
780 port->output = 1;
781 port->input = 0;
782 frm_cfg.frame_pin_dir = regk_sser_in;
783 gen_cfg.clk_dir = regk_sser_in;
784 break;
785 case MASTER_INPUT:
786 port->output = 0;
787 port->input = 1;
788 frm_cfg.frame_pin_dir = regk_sser_out;
789 frm_cfg.out_on = regk_sser_intern_tb;
790 gen_cfg.clk_dir = regk_sser_out;
791 break;
792 case SLAVE_INPUT:
793 port->output = 0;
794 port->input = 1;
795 frm_cfg.frame_pin_dir = regk_sser_in;
796 gen_cfg.clk_dir = regk_sser_in;
797 break;
798 case MASTER_BIDIR:
799 port->output = 1;
800 port->input = 1;
801 frm_cfg.frame_pin_dir = regk_sser_out;
802 frm_cfg.out_on = regk_sser_intern_tb;
803 gen_cfg.clk_dir = regk_sser_out;
804 break;
805 case SLAVE_BIDIR:
806 port->output = 1;
807 port->input = 1;
808 frm_cfg.frame_pin_dir = regk_sser_in;
809 gen_cfg.clk_dir = regk_sser_in;
810 break;
811 default:
812 spin_unlock_irq(&port->lock);
813 return -EINVAL;
814 }
815 if (!port->use_dma || (arg == MASTER_OUTPUT || arg == SLAVE_OUTPUT))
816 intr_mask.rdav = regk_sser_yes;
817 break;
818 case SSP_FRAME_SYNC:
819 if (arg & NORMAL_SYNC) {
820 frm_cfg.rec_delay = 1;
821 frm_cfg.tr_delay = 1;
822 }
823 else if (arg & EARLY_SYNC)
824 frm_cfg.rec_delay = frm_cfg.tr_delay = 0;
825 else if (arg & SECOND_WORD_SYNC) {
826 frm_cfg.rec_delay = 7;
827 frm_cfg.tr_delay = 1;
828 }
829
830 tr_cfg.bulk_wspace = frm_cfg.tr_delay;
831 frm_cfg.early_wend = regk_sser_yes;
832 if (arg & BIT_SYNC)
833 frm_cfg.type = regk_sser_edge;
834 else if (arg & WORD_SYNC)
835 frm_cfg.type = regk_sser_level;
836 else if (arg & EXTENDED_SYNC)
837 frm_cfg.early_wend = regk_sser_no;
838
839 if (arg & SYNC_ON)
840 frm_cfg.frame_pin_use = regk_sser_frm;
841 else if (arg & SYNC_OFF)
842 frm_cfg.frame_pin_use = regk_sser_gio0;
843
844 dma_w_size = regk_dma_set_w_size2;
845 if (arg & WORD_SIZE_8) {
846 rec_cfg.sample_size = tr_cfg.sample_size = 7;
847 dma_w_size = regk_dma_set_w_size1;
848 } else if (arg & WORD_SIZE_12)
849 rec_cfg.sample_size = tr_cfg.sample_size = 11;
850 else if (arg & WORD_SIZE_16)
851 rec_cfg.sample_size = tr_cfg.sample_size = 15;
852 else if (arg & WORD_SIZE_24)
853 rec_cfg.sample_size = tr_cfg.sample_size = 23;
854 else if (arg & WORD_SIZE_32)
855 rec_cfg.sample_size = tr_cfg.sample_size = 31;
856
857 if (arg & BIT_ORDER_MSB)
858 rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst;
859 else if (arg & BIT_ORDER_LSB)
860 rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_lsbfirst;
861
862 if (arg & FLOW_CONTROL_ENABLE) {
863 frm_cfg.status_pin_use = regk_sser_frm;
864 rec_cfg.fifo_thr = regk_sser_thr16;
865 } else if (arg & FLOW_CONTROL_DISABLE) {
866 frm_cfg.status_pin_use = regk_sser_gio0;
867 rec_cfg.fifo_thr = regk_sser_inf;
868 }
869
870 if (arg & CLOCK_NOT_GATED)
871 gen_cfg.gate_clk = regk_sser_no;
872 else if (arg & CLOCK_GATED)
873 gen_cfg.gate_clk = regk_sser_yes;
874
875 break;
876 case SSP_IPOLARITY:
877 /* NOTE!! negedge is considered NORMAL */
878 if (arg & CLOCK_NORMAL)
879 rec_cfg.clk_pol = regk_sser_neg;
880 else if (arg & CLOCK_INVERT)
881 rec_cfg.clk_pol = regk_sser_pos;
882
883 if (arg & FRAME_NORMAL)
884 frm_cfg.level = regk_sser_pos_hi;
885 else if (arg & FRAME_INVERT)
886 frm_cfg.level = regk_sser_neg_lo;
887
888 if (arg & STATUS_NORMAL)
889 gen_cfg.hold_pol = regk_sser_pos;
890 else if (arg & STATUS_INVERT)
891 gen_cfg.hold_pol = regk_sser_neg;
892 break;
893 case SSP_OPOLARITY:
894 if (arg & CLOCK_NORMAL)
895 gen_cfg.out_clk_pol = regk_sser_pos;
896 else if (arg & CLOCK_INVERT)
897 gen_cfg.out_clk_pol = regk_sser_neg;
898
899 if (arg & FRAME_NORMAL)
900 frm_cfg.level = regk_sser_pos_hi;
901 else if (arg & FRAME_INVERT)
902 frm_cfg.level = regk_sser_neg_lo;
903
904 if (arg & STATUS_NORMAL)
905 gen_cfg.hold_pol = regk_sser_pos;
906 else if (arg & STATUS_INVERT)
907 gen_cfg.hold_pol = regk_sser_neg;
908 break;
909 case SSP_SPI:
910 rec_cfg.fifo_thr = regk_sser_inf;
911 rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst;
912 rec_cfg.sample_size = tr_cfg.sample_size = 7;
913 frm_cfg.frame_pin_use = regk_sser_frm;
914 frm_cfg.type = regk_sser_level;
915 frm_cfg.tr_delay = 1;
916 frm_cfg.level = regk_sser_neg_lo;
917 if (arg & SPI_SLAVE)
918 {
919 rec_cfg.clk_pol = regk_sser_neg;
920 gen_cfg.clk_dir = regk_sser_in;
921 port->input = 1;
922 port->output = 0;
923 }
924 else
925 {
926 gen_cfg.out_clk_pol = regk_sser_pos;
927 port->input = 0;
928 port->output = 1;
929 gen_cfg.clk_dir = regk_sser_out;
930 }
931 break;
932 case SSP_INBUFCHUNK:
933 break;
934 default:
935 return_val = -1;
936 }
937
938
939 if (port->started) {
940 rec_cfg.rec_en = port->input;
941 gen_cfg.en = (port->output | port->input);
942 }
943
944 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
945 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
946 REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg);
947 REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
948 REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg);
949
950
951 if (cmd == SSP_FRAME_SYNC && (arg & (WORD_SIZE_8 | WORD_SIZE_12 |
952 WORD_SIZE_16 | WORD_SIZE_24 | WORD_SIZE_32))) {
953 int en = gen_cfg.en;
954 gen_cfg.en = 0;
955 REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg);
956 /* ##### Should DMA be stoped before we change dma size? */
957 DMA_WR_CMD(port->regi_dmain, dma_w_size);
958 DMA_WR_CMD(port->regi_dmaout, dma_w_size);
959 gen_cfg.en = en;
960 REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg);
961 }
962
963 spin_unlock_irq(&port->lock);
964 return return_val;
965 }
966
967 static long sync_serial_ioctl(struct file *file,
968 unsigned int cmd, unsigned long arg)
969 {
970 long ret;
971
972 mutex_lock(&sync_serial_mutex);
973 ret = sync_serial_ioctl_unlocked(file, cmd, arg);
974 mutex_unlock(&sync_serial_mutex);
975
976 return ret;
977 }
978
979 /* NOTE: sync_serial_write does not support concurrency */
980 static ssize_t sync_serial_write(struct file *file, const char *buf,
981 size_t count, loff_t *ppos)
982 {
983 int dev = iminor(file_inode(file));
984 DECLARE_WAITQUEUE(wait, current);
985 struct sync_port *port;
986 int trunc_count;
987 unsigned long flags;
988 int bytes_free;
989 int out_buf_count;
990
991 unsigned char *rd_ptr; /* First allocated byte in the buffer */
992 unsigned char *wr_ptr; /* First free byte in the buffer */
993 unsigned char *buf_stop_ptr; /* Last byte + 1 */
994
995 if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) {
996 DEBUG(printk("Invalid minor %d\n", dev));
997 return -ENODEV;
998 }
999 port = &ports[dev];
1000
1001 /* |<- OUT_BUFFER_SIZE ->|
1002 * |<- out_buf_count ->|
1003 * |<- trunc_count ->| ...->|
1004 * ______________________________________________________
1005 * | free | data | free |
1006 * |_________|___________________|________________________|
1007 * ^ rd_ptr ^ wr_ptr
1008 */
1009 DEBUGWRITE(printk(KERN_DEBUG "W d%d c %lu a: %p c: %p\n",
1010 port->port_nbr, count, port->active_tr_descr,
1011 port->catch_tr_descr));
1012
1013 /* Read variables that may be updated by interrupts */
1014 spin_lock_irqsave(&port->lock, flags);
1015 rd_ptr = port->out_rd_ptr;
1016 out_buf_count = port->out_buf_count;
1017 spin_unlock_irqrestore(&port->lock, flags);
1018
1019 /* Check if resources are available */
1020 if (port->tr_running &&
1021 ((port->use_dma && port->active_tr_descr == port->catch_tr_descr) ||
1022 out_buf_count >= OUT_BUFFER_SIZE)) {
1023 DEBUGWRITE(printk(KERN_DEBUG "sser%d full\n", dev));
1024 return -EAGAIN;
1025 }
1026
1027 buf_stop_ptr = port->out_buffer + OUT_BUFFER_SIZE;
1028
1029 /* Determine pointer to the first free byte, before copying. */
1030 wr_ptr = rd_ptr + out_buf_count;
1031 if (wr_ptr >= buf_stop_ptr)
1032 wr_ptr -= OUT_BUFFER_SIZE;
1033
1034 /* If we wrap the ring buffer, let the user space program handle it by
1035 * truncating the data. This could be more elegant, small buffer
1036 * fragments may occur.
1037 */
1038 bytes_free = OUT_BUFFER_SIZE - out_buf_count;
1039 if (wr_ptr + bytes_free > buf_stop_ptr)
1040 bytes_free = buf_stop_ptr - wr_ptr;
1041 trunc_count = (count < bytes_free) ? count : bytes_free;
1042
1043 if (copy_from_user(wr_ptr, buf, trunc_count))
1044 return -EFAULT;
1045
1046 DEBUGOUTBUF(printk(KERN_DEBUG "%-4d + %-4d = %-4d %p %p %p\n",
1047 out_buf_count, trunc_count,
1048 port->out_buf_count, port->out_buffer,
1049 wr_ptr, buf_stop_ptr));
1050
1051 /* Make sure transmitter/receiver is running */
1052 if (!port->started) {
1053 reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
1054 reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
1055 cfg.en = regk_sser_yes;
1056 rec_cfg.rec_en = port->input;
1057 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
1058 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
1059 port->started = 1;
1060 }
1061
1062 /* Setup wait if blocking */
1063 if (!(file->f_flags & O_NONBLOCK)) {
1064 add_wait_queue(&port->out_wait_q, &wait);
1065 set_current_state(TASK_INTERRUPTIBLE);
1066 }
1067
1068 spin_lock_irqsave(&port->lock, flags);
1069 port->out_buf_count += trunc_count;
1070 if (port->use_dma) {
1071 start_dma_out(port, wr_ptr, trunc_count);
1072 } else if (!port->tr_running) {
1073 reg_sser_rw_intr_mask intr_mask;
1074 intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
1075 /* Start sender by writing data */
1076 send_word(port);
1077 /* and enable transmitter ready IRQ */
1078 intr_mask.trdy = 1;
1079 REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
1080 }
1081 spin_unlock_irqrestore(&port->lock, flags);
1082
1083 /* Exit if non blocking */
1084 if (file->f_flags & O_NONBLOCK) {
1085 DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu %08x\n",
1086 port->port_nbr, trunc_count,
1087 REG_RD_INT(dma, port->regi_dmaout, r_intr)));
1088 return trunc_count;
1089 }
1090
1091 schedule();
1092 remove_wait_queue(&port->out_wait_q, &wait);
1093
1094 if (signal_pending(current))
1095 return -EINTR;
1096
1097 DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu\n",
1098 port->port_nbr, trunc_count));
1099 return trunc_count;
1100 }
1101
1102 static ssize_t sync_serial_read(struct file * file, char * buf,
1103 size_t count, loff_t *ppos)
1104 {
1105 int dev = iminor(file_inode(file));
1106 int avail;
1107 sync_port *port;
1108 unsigned char* start;
1109 unsigned char* end;
1110 unsigned long flags;
1111
1112 if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
1113 {
1114 DEBUG(printk("Invalid minor %d\n", dev));
1115 return -ENODEV;
1116 }
1117 port = &ports[dev];
1118
1119 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));
1120
1121 if (!port->started)
1122 {
1123 reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
1124 reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
1125 reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
1126 cfg.en = regk_sser_yes;
1127 tr_cfg.tr_en = regk_sser_yes;
1128 rec_cfg.rec_en = regk_sser_yes;
1129 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
1130 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
1131 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
1132 port->started = 1;
1133 }
1134
1135 /* Calculate number of available bytes */
1136 /* Save pointers to avoid that they are modified by interrupt */
1137 spin_lock_irqsave(&port->lock, flags);
1138 start = (unsigned char*)port->readp; /* cast away volatile */
1139 end = (unsigned char*)port->writep; /* cast away volatile */
1140 spin_unlock_irqrestore(&port->lock, flags);
1141 while ((start == end) && !port->full) /* No data */
1142 {
1143 DEBUGREAD(printk(KERN_DEBUG "&"));
1144 if (file->f_flags & O_NONBLOCK)
1145 return -EAGAIN;
1146
1147 wait_event_interruptible(port->in_wait_q,
1148 !(start == end && !port->full));
1149 if (signal_pending(current))
1150 return -EINTR;
1151
1152 spin_lock_irqsave(&port->lock, flags);
1153 start = (unsigned char*)port->readp; /* cast away volatile */
1154 end = (unsigned char*)port->writep; /* cast away volatile */
1155 spin_unlock_irqrestore(&port->lock, flags);
1156 }
1157
1158 /* Lazy read, never return wrapped data. */
1159 if (port->full)
1160 avail = port->in_buffer_size;
1161 else if (end > start)
1162 avail = end - start;
1163 else
1164 avail = port->flip + port->in_buffer_size - start;
1165
1166 count = count > avail ? avail : count;
1167 if (copy_to_user(buf, start, count))
1168 return -EFAULT;
1169 /* Disable interrupts while updating readp */
1170 spin_lock_irqsave(&port->lock, flags);
1171 port->readp += count;
1172 if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
1173 port->readp = port->flip;
1174 port->full = 0;
1175 spin_unlock_irqrestore(&port->lock, flags);
1176 DEBUGREAD(printk("r %d\n", count));
1177 return count;
1178 }
1179
1180 static void send_word(sync_port* port)
1181 {
1182 reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
1183 reg_sser_rw_tr_data tr_data = {0};
1184
1185 switch(tr_cfg.sample_size)
1186 {
1187 case 8:
1188 port->out_buf_count--;
1189 tr_data.data = *port->out_rd_ptr++;
1190 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1191 if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
1192 port->out_rd_ptr = port->out_buffer;
1193 break;
1194 case 12:
1195 {
1196 int data = (*port->out_rd_ptr++) << 8;
1197 data |= *port->out_rd_ptr++;
1198 port->out_buf_count -= 2;
1199 tr_data.data = data;
1200 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1201 if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
1202 port->out_rd_ptr = port->out_buffer;
1203 }
1204 break;
1205 case 16:
1206 port->out_buf_count -= 2;
1207 tr_data.data = *(unsigned short *)port->out_rd_ptr;
1208 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1209 port->out_rd_ptr += 2;
1210 if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
1211 port->out_rd_ptr = port->out_buffer;
1212 break;
1213 case 24:
1214 port->out_buf_count -= 3;
1215 tr_data.data = *(unsigned short *)port->out_rd_ptr;
1216 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1217 port->out_rd_ptr += 2;
1218 tr_data.data = *port->out_rd_ptr++;
1219 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1220 if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
1221 port->out_rd_ptr = port->out_buffer;
1222 break;
1223 case 32:
1224 port->out_buf_count -= 4;
1225 tr_data.data = *(unsigned short *)port->out_rd_ptr;
1226 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1227 port->out_rd_ptr += 2;
1228 tr_data.data = *(unsigned short *)port->out_rd_ptr;
1229 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1230 port->out_rd_ptr += 2;
1231 if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
1232 port->out_rd_ptr = port->out_buffer;
1233 break;
1234 }
1235 }
1236
1237 static void start_dma_out(struct sync_port *port,
1238 const char *data, int count)
1239 {
1240 port->active_tr_descr->buf = (char *) virt_to_phys((char *) data);
1241 port->active_tr_descr->after = port->active_tr_descr->buf + count;
1242 port->active_tr_descr->intr = 1;
1243
1244 port->active_tr_descr->eol = 1;
1245 port->prev_tr_descr->eol = 0;
1246
1247 DEBUGTRDMA(printk(KERN_DEBUG "Inserting eolr:%p eol@:%p\n",
1248 port->prev_tr_descr, port->active_tr_descr));
1249 port->prev_tr_descr = port->active_tr_descr;
1250 port->active_tr_descr = phys_to_virt((int) port->active_tr_descr->next);
1251
1252 if (!port->tr_running) {
1253 reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser,
1254 rw_tr_cfg);
1255
1256 port->out_context.next = 0;
1257 port->out_context.saved_data =
1258 (dma_descr_data *)virt_to_phys(port->prev_tr_descr);
1259 port->out_context.saved_data_buf = port->prev_tr_descr->buf;
1260
1261 DMA_START_CONTEXT(port->regi_dmaout,
1262 virt_to_phys((char *)&port->out_context));
1263
1264 tr_cfg.tr_en = regk_sser_yes;
1265 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
1266 DEBUGTRDMA(printk(KERN_DEBUG "dma s\n"););
1267 } else {
1268 DMA_CONTINUE_DATA(port->regi_dmaout);
1269 DEBUGTRDMA(printk(KERN_DEBUG "dma c\n"););
1270 }
1271
1272 port->tr_running = 1;
1273 }
1274
1275 static void start_dma_in(sync_port *port)
1276 {
1277 int i;
1278 char *buf;
1279 port->writep = port->flip;
1280
1281 if (port->writep > port->flip + port->in_buffer_size) {
1282 panic("Offset too large in sync serial driver\n");
1283 return;
1284 }
1285 buf = (char*)virt_to_phys(port->in_buffer);
1286 for (i = 0; i < NBR_IN_DESCR; i++) {
1287 port->in_descr[i].buf = buf;
1288 port->in_descr[i].after = buf + port->inbufchunk;
1289 port->in_descr[i].intr = 1;
1290 port->in_descr[i].next = (dma_descr_data*)virt_to_phys(&port->in_descr[i+1]);
1291 port->in_descr[i].buf = buf;
1292 buf += port->inbufchunk;
1293 }
1294 /* Link the last descriptor to the first */
1295 port->in_descr[i-1].next = (dma_descr_data*)virt_to_phys(&port->in_descr[0]);
1296 port->in_descr[i-1].eol = regk_sser_yes;
1297 port->next_rx_desc = &port->in_descr[0];
1298 port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR - 1];
1299 port->in_context.saved_data = (dma_descr_data*)virt_to_phys(&port->in_descr[0]);
1300 port->in_context.saved_data_buf = port->in_descr[0].buf;
1301 DMA_START_CONTEXT(port->regi_dmain, virt_to_phys(&port->in_context));
1302 }
1303
1304 #ifdef SYNC_SER_DMA
1305 static irqreturn_t tr_interrupt(int irq, void *dev_id)
1306 {
1307 reg_dma_r_masked_intr masked;
1308 reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes};
1309 reg_dma_rw_stat stat;
1310 int i;
1311 int found = 0;
1312 int stop_sser = 0;
1313
1314 for (i = 0; i < NBR_PORTS; i++) {
1315 sync_port *port = &ports[i];
1316 if (!port->enabled || !port->use_dma)
1317 continue;
1318
1319 /* IRQ active for the port? */
1320 masked = REG_RD(dma, port->regi_dmaout, r_masked_intr);
1321 if (!masked.data)
1322 continue;
1323
1324 found = 1;
1325
1326 /* Check if we should stop the DMA transfer */
1327 stat = REG_RD(dma, port->regi_dmaout, rw_stat);
1328 if (stat.list_state == regk_dma_data_at_eol)
1329 stop_sser = 1;
1330
1331 /* Clear IRQ */
1332 REG_WR(dma, port->regi_dmaout, rw_ack_intr, ack_intr);
1333
1334 if (!stop_sser) {
1335 /* The DMA has completed a descriptor, EOL was not
1336 * encountered, so step relevant descriptor and
1337 * datapointers forward. */
1338 int sent;
1339 sent = port->catch_tr_descr->after -
1340 port->catch_tr_descr->buf;
1341 DEBUGTXINT(printk(KERN_DEBUG "%-4d - %-4d = %-4d\t"
1342 "in descr %p (ac: %p)\n",
1343 port->out_buf_count, sent,
1344 port->out_buf_count - sent,
1345 port->catch_tr_descr,
1346 port->active_tr_descr););
1347 port->out_buf_count -= sent;
1348 port->catch_tr_descr =
1349 phys_to_virt((int) port->catch_tr_descr->next);
1350 port->out_rd_ptr =
1351 phys_to_virt((int) port->catch_tr_descr->buf);
1352 } else {
1353 int i, sent;
1354 /* EOL handler.
1355 * Note that if an EOL was encountered during the irq
1356 * locked section of sync_ser_write the DMA will be
1357 * restarted and the eol flag will be cleared.
1358 * The remaining descriptors will be traversed by
1359 * the descriptor interrupts as usual.
1360 */
1361 i = 0;
1362 while (!port->catch_tr_descr->eol) {
1363 sent = port->catch_tr_descr->after -
1364 port->catch_tr_descr->buf;
1365 DEBUGOUTBUF(printk(KERN_DEBUG
1366 "traversing descr %p -%d (%d)\n",
1367 port->catch_tr_descr,
1368 sent,
1369 port->out_buf_count));
1370 port->out_buf_count -= sent;
1371 port->catch_tr_descr = phys_to_virt(
1372 (int)port->catch_tr_descr->next);
1373 i++;
1374 if (i >= NBR_OUT_DESCR) {
1375 /* TODO: Reset and recover */
1376 panic("sync_serial: missing eol");
1377 }
1378 }
1379 sent = port->catch_tr_descr->after -
1380 port->catch_tr_descr->buf;
1381 DEBUGOUTBUF(printk(KERN_DEBUG
1382 "eol at descr %p -%d (%d)\n",
1383 port->catch_tr_descr,
1384 sent,
1385 port->out_buf_count));
1386
1387 port->out_buf_count -= sent;
1388
1389 /* Update read pointer to first free byte, we
1390 * may already be writing data there. */
1391 port->out_rd_ptr =
1392 phys_to_virt((int) port->catch_tr_descr->after);
1393 if (port->out_rd_ptr > port->out_buffer +
1394 OUT_BUFFER_SIZE)
1395 port->out_rd_ptr = port->out_buffer;
1396
1397 reg_sser_rw_tr_cfg tr_cfg =
1398 REG_RD(sser, port->regi_sser, rw_tr_cfg);
1399 DEBUGTXINT(printk(KERN_DEBUG
1400 "tr_int DMA stop %d, set catch @ %p\n",
1401 port->out_buf_count,
1402 port->active_tr_descr));
1403 if (port->out_buf_count != 0)
1404 printk(KERN_CRIT "sync_ser: buffer not "
1405 "empty after eol.\n");
1406 port->catch_tr_descr = port->active_tr_descr;
1407 port->tr_running = 0;
1408 tr_cfg.tr_en = regk_sser_no;
1409 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
1410 }
1411 /* wake up the waiting process */
1412 wake_up_interruptible(&port->out_wait_q);
1413 }
1414 return IRQ_RETVAL(found);
1415 } /* tr_interrupt */
1416
1417 static irqreturn_t rx_interrupt(int irq, void *dev_id)
1418 {
1419 reg_dma_r_masked_intr masked;
1420 reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes};
1421
1422 int i;
1423 int found = 0;
1424
1425 for (i = 0; i < NBR_PORTS; i++)
1426 {
1427 sync_port *port = &ports[i];
1428
1429 if (!port->enabled || !port->use_dma )
1430 continue;
1431
1432 masked = REG_RD(dma, port->regi_dmain, r_masked_intr);
1433
1434 if (masked.data) /* Descriptor interrupt */
1435 {
1436 found = 1;
1437 while (REG_RD(dma, port->regi_dmain, rw_data) !=
1438 virt_to_phys(port->next_rx_desc)) {
1439 DEBUGRXINT(printk(KERN_DEBUG "!"));
1440 if (port->writep + port->inbufchunk > port->flip + port->in_buffer_size) {
1441 int first_size = port->flip + port->in_buffer_size - port->writep;
1442 memcpy((char*)port->writep, phys_to_virt((unsigned)port->next_rx_desc->buf), first_size);
1443 memcpy(port->flip, phys_to_virt((unsigned)port->next_rx_desc->buf+first_size), port->inbufchunk - first_size);
1444 port->writep = port->flip + port->inbufchunk - first_size;
1445 } else {
1446 memcpy((char*)port->writep,
1447 phys_to_virt((unsigned)port->next_rx_desc->buf),
1448 port->inbufchunk);
1449 port->writep += port->inbufchunk;
1450 if (port->writep >= port->flip + port->in_buffer_size)
1451 port->writep = port->flip;
1452 }
1453 if (port->writep == port->readp)
1454 {
1455 port->full = 1;
1456 }
1457
1458 port->next_rx_desc->eol = 1;
1459 port->prev_rx_desc->eol = 0;
1460 /* Cache bug workaround */
1461 flush_dma_descr(port->prev_rx_desc, 0);
1462 port->prev_rx_desc = port->next_rx_desc;
1463 port->next_rx_desc = phys_to_virt((unsigned)port->next_rx_desc->next);
1464 /* Cache bug workaround */
1465 flush_dma_descr(port->prev_rx_desc, 1);
1466 /* wake up the waiting process */
1467 wake_up_interruptible(&port->in_wait_q);
1468 DMA_CONTINUE(port->regi_dmain);
1469 REG_WR(dma, port->regi_dmain, rw_ack_intr, ack_intr);
1470
1471 }
1472 }
1473 }
1474 return IRQ_RETVAL(found);
1475 } /* rx_interrupt */
1476 #endif /* SYNC_SER_DMA */
1477
1478 #ifdef SYNC_SER_MANUAL
1479 static irqreturn_t manual_interrupt(int irq, void *dev_id)
1480 {
1481 int i;
1482 int found = 0;
1483 reg_sser_r_masked_intr masked;
1484
1485 for (i = 0; i < NBR_PORTS; i++)
1486 {
1487 sync_port *port = &ports[i];
1488
1489 if (!port->enabled || port->use_dma)
1490 {
1491 continue;
1492 }
1493
1494 masked = REG_RD(sser, port->regi_sser, r_masked_intr);
1495 if (masked.rdav) /* Data received? */
1496 {
1497 reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
1498 reg_sser_r_rec_data data = REG_RD(sser, port->regi_sser, r_rec_data);
1499 found = 1;
1500 /* Read data */
1501 switch(rec_cfg.sample_size)
1502 {
1503 case 8:
1504 *port->writep++ = data.data & 0xff;
1505 break;
1506 case 12:
1507 *port->writep = (data.data & 0x0ff0) >> 4;
1508 *(port->writep + 1) = data.data & 0x0f;
1509 port->writep+=2;
1510 break;
1511 case 16:
1512 *(unsigned short*)port->writep = data.data;
1513 port->writep+=2;
1514 break;
1515 case 24:
1516 *(unsigned int*)port->writep = data.data;
1517 port->writep+=3;
1518 break;
1519 case 32:
1520 *(unsigned int*)port->writep = data.data;
1521 port->writep+=4;
1522 break;
1523 }
1524
1525 if (port->writep >= port->flip + port->in_buffer_size) /* Wrap? */
1526 port->writep = port->flip;
1527 if (port->writep == port->readp) {
1528 /* receive buffer overrun, discard oldest data
1529 */
1530 port->readp++;
1531 if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
1532 port->readp = port->flip;
1533 }
1534 if (sync_data_avail(port) >= port->inbufchunk)
1535 wake_up_interruptible(&port->in_wait_q); /* Wake up application */
1536 }
1537
1538 if (masked.trdy) /* Transmitter ready? */
1539 {
1540 found = 1;
1541 if (port->out_buf_count > 0) /* More data to send */
1542 send_word(port);
1543 else /* transmission finished */
1544 {
1545 reg_sser_rw_intr_mask intr_mask;
1546 intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
1547 intr_mask.trdy = 0;
1548 REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
1549 wake_up_interruptible(&port->out_wait_q); /* Wake up application */
1550 }
1551 }
1552 }
1553 return IRQ_RETVAL(found);
1554 }
1555 #endif
1556
1557 module_init(etrax_sync_serial_init);
Linux kernel - Deliverables
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