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Linux 2.6.26-rc5
[linux-2.6/openmoko-kernel/knife-kernel.git] / arch / cris / arch-v32 / drivers / sync_serial.c
blob47c377df6fb361e7342d2e8a537c463b3bbd8962
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/slab.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
23 #include <asm/io.h>
24 #include <dma.h>
25 #include <pinmux.h>
26 #include <hwregs/reg_rdwr.h>
27 #include <hwregs/sser_defs.h>
28 #include <hwregs/dma_defs.h>
29 #include <hwregs/dma.h>
30 #include <hwregs/intr_vect_defs.h>
31 #include <hwregs/intr_vect.h>
32 #include <hwregs/reg_map.h>
33 #include <asm/sync_serial.h>
34
35
36 /* The receiver is a bit tricky beacuse of the continuous stream of data.*/
37 /* */
38 /* Three DMA descriptors are linked together. Each DMA descriptor is */
39 /* responsible for port->bufchunk of a common buffer. */
40 /* */
41 /* +---------------------------------------------+ */
42 /* | +----------+ +----------+ +----------+ | */
43 /* +-> | Descr[0] |-->| Descr[1] |-->| Descr[2] |-+ */
44 /* +----------+ +----------+ +----------+ */
45 /* | | | */
46 /* v v v */
47 /* +-------------------------------------+ */
48 /* | BUFFER | */
49 /* +-------------------------------------+ */
50 /* |<- data_avail ->| */
51 /* readp writep */
52 /* */
53 /* If the application keeps up the pace readp will be right after writep.*/
54 /* If the application can't keep the pace we have to throw away data. */
55 /* The idea is that readp should be ready with the data pointed out by */
56 /* Descr[i] when the DMA has filled in Descr[i+1]. */
57 /* Otherwise we will discard */
58 /* the rest of the data pointed out by Descr1 and set readp to the start */
59 /* of Descr2 */
60
61 #define SYNC_SERIAL_MAJOR 125
62
63 /* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */
64 /* words can be handled */
65 #define IN_BUFFER_SIZE 12288
66 #define IN_DESCR_SIZE 256
67 #define NBR_IN_DESCR (IN_BUFFER_SIZE/IN_DESCR_SIZE)
68
69 #define OUT_BUFFER_SIZE 1024*8
70 #define NBR_OUT_DESCR 8
71
72 #define DEFAULT_FRAME_RATE 0
73 #define DEFAULT_WORD_RATE 7
74
75 /* NOTE: Enabling some debug will likely cause overrun or underrun,
76 * especially if manual mode is use.
77 */
78 #define DEBUG(x)
79 #define DEBUGREAD(x)
80 #define DEBUGWRITE(x)
81 #define DEBUGPOLL(x)
82 #define DEBUGRXINT(x)
83 #define DEBUGTXINT(x)
84 #define DEBUGTRDMA(x)
85 #define DEBUGOUTBUF(x)
86
87 typedef struct sync_port
88 {
89 reg_scope_instances regi_sser;
90 reg_scope_instances regi_dmain;
91 reg_scope_instances regi_dmaout;
92
93 char started; /* 1 if port has been started */
94 char port_nbr; /* Port 0 or 1 */
95 char busy; /* 1 if port is busy */
96
97 char enabled; /* 1 if port is enabled */
98 char use_dma; /* 1 if port uses dma */
99 char tr_running;
100
101 char init_irqs;
102 int output;
103 int input;
104
105 /* Next byte to be read by application */
106 volatile unsigned char *volatile readp;
107 /* Next byte to be written by etrax */
108 volatile unsigned char *volatile writep;
109
110 unsigned int in_buffer_size;
111 unsigned int inbufchunk;
112 unsigned char out_buffer[OUT_BUFFER_SIZE] __attribute__ ((aligned(32)));
113 unsigned char in_buffer[IN_BUFFER_SIZE]__attribute__ ((aligned(32)));
114 unsigned char flip[IN_BUFFER_SIZE] __attribute__ ((aligned(32)));
115 struct dma_descr_data* next_rx_desc;
116 struct dma_descr_data* prev_rx_desc;
117
118 /* Pointer to the first available descriptor in the ring,
119 * unless active_tr_descr == catch_tr_descr and a dma
120 * transfer is active */
121 struct dma_descr_data *active_tr_descr;
122
123 /* Pointer to the first allocated descriptor in the ring */
124 struct dma_descr_data *catch_tr_descr;
125
126 /* Pointer to the descriptor with the current end-of-list */
127 struct dma_descr_data *prev_tr_descr;
128 int full;
129
130 /* Pointer to the first byte being read by DMA
131 * or current position in out_buffer if not using DMA. */
132 unsigned char *out_rd_ptr;
133
134 /* Number of bytes currently locked for being read by DMA */
135 int out_buf_count;
136
137 dma_descr_data in_descr[NBR_IN_DESCR] __attribute__ ((__aligned__(16)));
138 dma_descr_context in_context __attribute__ ((__aligned__(32)));
139 dma_descr_data out_descr[NBR_OUT_DESCR]
140 __attribute__ ((__aligned__(16)));
141 dma_descr_context out_context __attribute__ ((__aligned__(32)));
142 wait_queue_head_t out_wait_q;
143 wait_queue_head_t in_wait_q;
144
145 spinlock_t lock;
146 } sync_port;
147
148 static int etrax_sync_serial_init(void);
149 static void initialize_port(int portnbr);
150 static inline int sync_data_avail(struct sync_port *port);
151
152 static int sync_serial_open(struct inode *, struct file*);
153 static int sync_serial_release(struct inode*, struct file*);
154 static unsigned int sync_serial_poll(struct file *filp, poll_table *wait);
155
156 static int sync_serial_ioctl(struct inode*, struct file*,
157 unsigned int cmd, unsigned long arg);
158 static ssize_t sync_serial_write(struct file * file, const char * buf,
159 size_t count, loff_t *ppos);
160 static ssize_t sync_serial_read(struct file *file, char *buf,
161 size_t count, loff_t *ppos);
162
163 #if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
164 defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
165 (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
166 defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))
167 #define SYNC_SER_DMA
168 #endif
169
170 static void send_word(sync_port* port);
171 static void start_dma_out(struct sync_port *port, const char *data, int count);
172 static void start_dma_in(sync_port* port);
173 #ifdef SYNC_SER_DMA
174 static irqreturn_t tr_interrupt(int irq, void *dev_id);
175 static irqreturn_t rx_interrupt(int irq, void *dev_id);
176 #endif
177
178 #if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
179 !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
180 (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
181 !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))
182 #define SYNC_SER_MANUAL
183 #endif
184 #ifdef SYNC_SER_MANUAL
185 static irqreturn_t manual_interrupt(int irq, void *dev_id);
186 #endif
187
188 #ifdef CONFIG_ETRAXFS /* ETRAX FS */
189 #define OUT_DMA_NBR 4
190 #define IN_DMA_NBR 5
191 #define PINMUX_SSER pinmux_sser0
192 #define SYNCSER_INST regi_sser0
193 #define SYNCSER_INTR_VECT SSER0_INTR_VECT
194 #define OUT_DMA_INST regi_dma4
195 #define IN_DMA_INST regi_dma5
196 #define DMA_OUT_INTR_VECT DMA4_INTR_VECT
197 #define DMA_IN_INTR_VECT DMA5_INTR_VECT
198 #define REQ_DMA_SYNCSER dma_sser0
199 #else /* Artpec-3 */
200 #define OUT_DMA_NBR 6
201 #define IN_DMA_NBR 7
202 #define PINMUX_SSER pinmux_sser
203 #define SYNCSER_INST regi_sser
204 #define SYNCSER_INTR_VECT SSER_INTR_VECT
205 #define OUT_DMA_INST regi_dma6
206 #define IN_DMA_INST regi_dma7
207 #define DMA_OUT_INTR_VECT DMA6_INTR_VECT
208 #define DMA_IN_INTR_VECT DMA7_INTR_VECT
209 #define REQ_DMA_SYNCSER dma_sser
210 #endif
211
212 /* The ports */
213 static struct sync_port ports[]=
214 {
215 {
216 .regi_sser = SYNCSER_INST,
217 .regi_dmaout = OUT_DMA_INST,
218 .regi_dmain = IN_DMA_INST,
219 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)
220 .use_dma = 1,
221 #else
222 .use_dma = 0,
223 #endif
224 }
225 #ifdef CONFIG_ETRAXFS
226 ,
227
228 {
229 .regi_sser = regi_sser1,
230 .regi_dmaout = regi_dma6,
231 .regi_dmain = regi_dma7,
232 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)
233 .use_dma = 1,
234 #else
235 .use_dma = 0,
236 #endif
237 }
238 #endif
239 };
240
241 #define NBR_PORTS ARRAY_SIZE(ports)
242
243 static const struct file_operations sync_serial_fops = {
244 .owner = THIS_MODULE,
245 .write = sync_serial_write,
246 .read = sync_serial_read,
247 .poll = sync_serial_poll,
248 .ioctl = sync_serial_ioctl,
249 .open = sync_serial_open,
250 .release = sync_serial_release
251 };
252
253 static int __init etrax_sync_serial_init(void)
254 {
255 ports[0].enabled = 0;
256 #ifdef CONFIG_ETRAXFS
257 ports[1].enabled = 0;
258 #endif
259 if (register_chrdev(SYNC_SERIAL_MAJOR, "sync serial",
260 &sync_serial_fops) < 0) {
261 printk(KERN_WARNING
262 "Unable to get major for synchronous serial port\n");
263 return -EBUSY;
264 }
265
266 /* Initialize Ports */
267 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
268 if (crisv32_pinmux_alloc_fixed(PINMUX_SSER)) {
269 printk(KERN_WARNING
270 "Unable to alloc pins for synchronous serial port 0\n");
271 return -EIO;
272 }
273 ports[0].enabled = 1;
274 initialize_port(0);
275 #endif
276
277 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
278 if (crisv32_pinmux_alloc_fixed(pinmux_sser1)) {
279 printk(KERN_WARNING
280 "Unable to alloc pins for synchronous serial port 0\n");
281 return -EIO;
282 }
283 ports[1].enabled = 1;
284 initialize_port(1);
285 #endif
286
287 #ifdef CONFIG_ETRAXFS
288 printk(KERN_INFO "ETRAX FS synchronous serial port driver\n");
289 #else
290 printk(KERN_INFO "Artpec-3 synchronous serial port driver\n");
291 #endif
292 return 0;
293 }
294
295 static void __init initialize_port(int portnbr)
296 {
297 int __attribute__((unused)) i;
298 struct sync_port *port = &ports[portnbr];
299 reg_sser_rw_cfg cfg = {0};
300 reg_sser_rw_frm_cfg frm_cfg = {0};
301 reg_sser_rw_tr_cfg tr_cfg = {0};
302 reg_sser_rw_rec_cfg rec_cfg = {0};
303
304 DEBUG(printk(KERN_DEBUG "Init sync serial port %d\n", portnbr));
305
306 port->port_nbr = portnbr;
307 port->init_irqs = 1;
308
309 port->out_rd_ptr = port->out_buffer;
310 port->out_buf_count = 0;
311
312 port->output = 1;
313 port->input = 0;
314
315 port->readp = port->flip;
316 port->writep = port->flip;
317 port->in_buffer_size = IN_BUFFER_SIZE;
318 port->inbufchunk = IN_DESCR_SIZE;
319 port->next_rx_desc = &port->in_descr[0];
320 port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR-1];
321 port->prev_rx_desc->eol = 1;
322
323 init_waitqueue_head(&port->out_wait_q);
324 init_waitqueue_head(&port->in_wait_q);
325
326 spin_lock_init(&port->lock);
327
328 cfg.out_clk_src = regk_sser_intern_clk;
329 cfg.out_clk_pol = regk_sser_pos;
330 cfg.clk_od_mode = regk_sser_no;
331 cfg.clk_dir = regk_sser_out;
332 cfg.gate_clk = regk_sser_no;
333 cfg.base_freq = regk_sser_f29_493;
334 cfg.clk_div = 256;
335 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
336
337 frm_cfg.wordrate = DEFAULT_WORD_RATE;
338 frm_cfg.type = regk_sser_edge;
339 frm_cfg.frame_pin_dir = regk_sser_out;
340 frm_cfg.frame_pin_use = regk_sser_frm;
341 frm_cfg.status_pin_dir = regk_sser_in;
342 frm_cfg.status_pin_use = regk_sser_hold;
343 frm_cfg.out_on = regk_sser_tr;
344 frm_cfg.tr_delay = 1;
345 REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg);
346
347 tr_cfg.urun_stop = regk_sser_no;
348 tr_cfg.sample_size = 7;
349 tr_cfg.sh_dir = regk_sser_msbfirst;
350 tr_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no;
351 #if 0
352 tr_cfg.rate_ctrl = regk_sser_bulk;
353 tr_cfg.data_pin_use = regk_sser_dout;
354 #else
355 tr_cfg.rate_ctrl = regk_sser_iso;
356 tr_cfg.data_pin_use = regk_sser_dout;
357 #endif
358 tr_cfg.bulk_wspace = 1;
359 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
360
361 rec_cfg.sample_size = 7;
362 rec_cfg.sh_dir = regk_sser_msbfirst;
363 rec_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no;
364 rec_cfg.fifo_thr = regk_sser_inf;
365 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
366
367 #ifdef SYNC_SER_DMA
368 /* Setup the descriptor ring for dma out/transmit. */
369 for (i = 0; i < NBR_OUT_DESCR; i++) {
370 port->out_descr[i].wait = 0;
371 port->out_descr[i].intr = 1;
372 port->out_descr[i].eol = 0;
373 port->out_descr[i].out_eop = 0;
374 port->out_descr[i].next =
375 (dma_descr_data *)virt_to_phys(&port->out_descr[i+1]);
376 }
377
378 /* Create a ring from the list. */
379 port->out_descr[NBR_OUT_DESCR-1].next =
380 (dma_descr_data *)virt_to_phys(&port->out_descr[0]);
381
382 /* Setup context for traversing the ring. */
383 port->active_tr_descr = &port->out_descr[0];
384 port->prev_tr_descr = &port->out_descr[NBR_OUT_DESCR-1];
385 port->catch_tr_descr = &port->out_descr[0];
386 #endif
387 }
388
389 static inline int sync_data_avail(struct sync_port *port)
390 {
391 int avail;
392 unsigned char *start;
393 unsigned char *end;
394
395 start = (unsigned char*)port->readp; /* cast away volatile */
396 end = (unsigned char*)port->writep; /* cast away volatile */
397 /* 0123456789 0123456789
398 * ----- - -----
399 * ^rp ^wp ^wp ^rp
400 */
401
402 if (end >= start)
403 avail = end - start;
404 else
405 avail = port->in_buffer_size - (start - end);
406 return avail;
407 }
408
409 static inline int sync_data_avail_to_end(struct sync_port *port)
410 {
411 int avail;
412 unsigned char *start;
413 unsigned char *end;
414
415 start = (unsigned char*)port->readp; /* cast away volatile */
416 end = (unsigned char*)port->writep; /* cast away volatile */
417 /* 0123456789 0123456789
418 * ----- -----
419 * ^rp ^wp ^wp ^rp
420 */
421
422 if (end >= start)
423 avail = end - start;
424 else
425 avail = port->flip + port->in_buffer_size - start;
426 return avail;
427 }
428
429 static int sync_serial_open(struct inode *inode, struct file *file)
430 {
431 int dev = iminor(inode);
432 sync_port *port;
433 reg_dma_rw_cfg cfg = {.en = regk_dma_yes};
434 reg_dma_rw_intr_mask intr_mask = {.data = regk_dma_yes};
435
436 DEBUG(printk(KERN_DEBUG "Open sync serial port %d\n", dev));
437
438 if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
439 {
440 DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
441 return -ENODEV;
442 }
443 port = &ports[dev];
444 /* Allow open this device twice (assuming one reader and one writer) */
445 if (port->busy == 2)
446 {
447 DEBUG(printk(KERN_DEBUG "Device is busy.. \n"));
448 return -EBUSY;
449 }
450
451
452 if (port->init_irqs) {
453 if (port->use_dma) {
454 if (port == &ports[0]) {
455 #ifdef SYNC_SER_DMA
456 if (request_irq(DMA_OUT_INTR_VECT,
457 tr_interrupt,
458 0,
459 "synchronous serial 0 dma tr",
460 &ports[0])) {
461 printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
462 return -EBUSY;
463 } else if (request_irq(DMA_IN_INTR_VECT,
464 rx_interrupt,
465 0,
466 "synchronous serial 1 dma rx",
467 &ports[0])) {
468 free_irq(DMA_OUT_INTR_VECT, &port[0]);
469 printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
470 return -EBUSY;
471 } else if (crisv32_request_dma(OUT_DMA_NBR,
472 "synchronous serial 0 dma tr",
473 DMA_VERBOSE_ON_ERROR,
474 0,
475 REQ_DMA_SYNCSER)) {
476 free_irq(DMA_OUT_INTR_VECT, &port[0]);
477 free_irq(DMA_IN_INTR_VECT, &port[0]);
478 printk(KERN_CRIT "Can't allocate sync serial port 0 TX DMA channel");
479 return -EBUSY;
480 } else if (crisv32_request_dma(IN_DMA_NBR,
481 "synchronous serial 0 dma rec",
482 DMA_VERBOSE_ON_ERROR,
483 0,
484 REQ_DMA_SYNCSER)) {
485 crisv32_free_dma(OUT_DMA_NBR);
486 free_irq(DMA_OUT_INTR_VECT, &port[0]);
487 free_irq(DMA_IN_INTR_VECT, &port[0]);
488 printk(KERN_CRIT "Can't allocate sync serial port 1 RX DMA channel");
489 return -EBUSY;
490 }
491 #endif
492 }
493 #ifdef CONFIG_ETRAXFS
494 else if (port == &ports[1]) {
495 #ifdef SYNC_SER_DMA
496 if (request_irq(DMA6_INTR_VECT,
497 tr_interrupt,
498 0,
499 "synchronous serial 1 dma tr",
500 &ports[1])) {
501 printk(KERN_CRIT "Can't allocate sync serial port 1 IRQ");
502 return -EBUSY;
503 } else if (request_irq(DMA7_INTR_VECT,
504 rx_interrupt,
505 0,
506 "synchronous serial 1 dma rx",
507 &ports[1])) {
508 free_irq(DMA6_INTR_VECT, &ports[1]);
509 printk(KERN_CRIT "Can't allocate sync serial port 3 IRQ");
510 return -EBUSY;
511 } else if (crisv32_request_dma(
512 SYNC_SER1_TX_DMA_NBR,
513 "synchronous serial 1 dma tr",
514 DMA_VERBOSE_ON_ERROR,
515 0,
516 dma_sser1)) {
517 free_irq(DMA6_INTR_VECT, &ports[1]);
518 free_irq(DMA7_INTR_VECT, &ports[1]);
519 printk(KERN_CRIT "Can't allocate sync serial port 3 TX DMA channel");
520 return -EBUSY;
521 } else if (crisv32_request_dma(
522 SYNC_SER1_RX_DMA_NBR,
523 "synchronous serial 3 dma rec",
524 DMA_VERBOSE_ON_ERROR,
525 0,
526 dma_sser1)) {
527 crisv32_free_dma(SYNC_SER1_TX_DMA_NBR);
528 free_irq(DMA6_INTR_VECT, &ports[1]);
529 free_irq(DMA7_INTR_VECT, &ports[1]);
530 printk(KERN_CRIT "Can't allocate sync serial port 3 RX DMA channel");
531 return -EBUSY;
532 }
533 #endif
534 }
535 #endif
536 /* Enable DMAs */
537 REG_WR(dma, port->regi_dmain, rw_cfg, cfg);
538 REG_WR(dma, port->regi_dmaout, rw_cfg, cfg);
539 /* Enable DMA IRQs */
540 REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask);
541 REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask);
542 /* Set up wordsize = 1 for DMAs. */
543 DMA_WR_CMD (port->regi_dmain, regk_dma_set_w_size1);
544 DMA_WR_CMD (port->regi_dmaout, regk_dma_set_w_size1);
545
546 start_dma_in(port);
547 port->init_irqs = 0;
548 } else { /* !port->use_dma */
549 #ifdef SYNC_SER_MANUAL
550 if (port == &ports[0]) {
551 if (request_irq(SYNCSER_INTR_VECT,
552 manual_interrupt,
553 0,
554 "synchronous serial manual irq",
555 &ports[0])) {
556 printk("Can't allocate sync serial manual irq");
557 return -EBUSY;
558 }
559 }
560 #ifdef CONFIG_ETRAXFS
561 else if (port == &ports[1]) {
562 if (request_irq(SSER1_INTR_VECT,
563 manual_interrupt,
564 0,
565 "synchronous serial manual irq",
566 &ports[1])) {
567 printk(KERN_CRIT "Can't allocate sync serial manual irq");
568 return -EBUSY;
569 }
570 }
571 #endif
572 port->init_irqs = 0;
573 #else
574 panic("sync_serial: Manual mode not supported.\n");
575 #endif /* SYNC_SER_MANUAL */
576 }
577
578 } /* port->init_irqs */
579
580 port->busy++;
581 return 0;
582 }
583
584 static int sync_serial_release(struct inode *inode, struct file *file)
585 {
586 int dev = iminor(inode);
587 sync_port *port;
588
589 if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
590 {
591 DEBUG(printk("Invalid minor %d\n", dev));
592 return -ENODEV;
593 }
594 port = &ports[dev];
595 if (port->busy)
596 port->busy--;
597 if (!port->busy)
598 /* XXX */ ;
599 return 0;
600 }
601
602 static unsigned int sync_serial_poll(struct file *file, poll_table *wait)
603 {
604 int dev = iminor(file->f_path.dentry->d_inode);
605 unsigned int mask = 0;
606 sync_port *port;
607 DEBUGPOLL( static unsigned int prev_mask = 0; );
608
609 port = &ports[dev];
610
611 if (!port->started) {
612 reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
613 reg_sser_rw_rec_cfg rec_cfg =
614 REG_RD(sser, port->regi_sser, rw_rec_cfg);
615 cfg.en = regk_sser_yes;
616 rec_cfg.rec_en = port->input;
617 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
618 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
619 port->started = 1;
620 }
621
622 poll_wait(file, &port->out_wait_q, wait);
623 poll_wait(file, &port->in_wait_q, wait);
624
625 /* No active transfer, descriptors are available */
626 if (port->output && !port->tr_running)
627 mask |= POLLOUT | POLLWRNORM;
628
629 /* Descriptor and buffer space available. */
630 if (port->output &&
631 port->active_tr_descr != port->catch_tr_descr &&
632 port->out_buf_count < OUT_BUFFER_SIZE)
633 mask |= POLLOUT | POLLWRNORM;
634
635 /* At least an inbufchunk of data */
636 if (port->input && sync_data_avail(port) >= port->inbufchunk)
637 mask |= POLLIN | POLLRDNORM;
638
639 DEBUGPOLL(if (mask != prev_mask)
640 printk("sync_serial_poll: mask 0x%08X %s %s\n", mask,
641 mask&POLLOUT?"POLLOUT":"", mask&POLLIN?"POLLIN":"");
642 prev_mask = mask;
643 );
644 return mask;
645 }
646
647 static int sync_serial_ioctl(struct inode *inode, struct file *file,
648 unsigned int cmd, unsigned long arg)
649 {
650 int return_val = 0;
651 int dma_w_size = regk_dma_set_w_size1;
652 int dev = iminor(file->f_path.dentry->d_inode);
653 sync_port *port;
654 reg_sser_rw_tr_cfg tr_cfg;
655 reg_sser_rw_rec_cfg rec_cfg;
656 reg_sser_rw_frm_cfg frm_cfg;
657 reg_sser_rw_cfg gen_cfg;
658 reg_sser_rw_intr_mask intr_mask;
659
660 if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
661 {
662 DEBUG(printk("Invalid minor %d\n", dev));
663 return -1;
664 }
665 port = &ports[dev];
666 spin_lock_irq(&port->lock);
667
668 tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
669 rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
670 frm_cfg = REG_RD(sser, port->regi_sser, rw_frm_cfg);
671 gen_cfg = REG_RD(sser, port->regi_sser, rw_cfg);
672 intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
673
674 switch(cmd)
675 {
676 case SSP_SPEED:
677 if (GET_SPEED(arg) == CODEC)
678 {
679 unsigned int freq;
680
681 gen_cfg.base_freq = regk_sser_f32;
682
683 /* Clock divider will internally be
684 * gen_cfg.clk_div + 1.
685 */
686
687 freq = GET_FREQ(arg);
688 switch (freq) {
689 case FREQ_32kHz:
690 case FREQ_64kHz:
691 case FREQ_128kHz:
692 case FREQ_256kHz:
693 gen_cfg.clk_div = 125 *
694 (1 << (freq - FREQ_256kHz)) - 1;
695 break;
696 case FREQ_512kHz:
697 gen_cfg.clk_div = 62;
698 break;
699 case FREQ_1MHz:
700 case FREQ_2MHz:
701 case FREQ_4MHz:
702 gen_cfg.clk_div = 8 * (1 << freq) - 1;
703 break;
704 }
705 } else {
706 gen_cfg.base_freq = regk_sser_f29_493;
707 switch (GET_SPEED(arg)) {
708 case SSP150:
709 gen_cfg.clk_div = 29493000 / (150 * 8) - 1;
710 break;
711 case SSP300:
712 gen_cfg.clk_div = 29493000 / (300 * 8) - 1;
713 break;
714 case SSP600:
715 gen_cfg.clk_div = 29493000 / (600 * 8) - 1;
716 break;
717 case SSP1200:
718 gen_cfg.clk_div = 29493000 / (1200 * 8) - 1;
719 break;
720 case SSP2400:
721 gen_cfg.clk_div = 29493000 / (2400 * 8) - 1;
722 break;
723 case SSP4800:
724 gen_cfg.clk_div = 29493000 / (4800 * 8) - 1;
725 break;
726 case SSP9600:
727 gen_cfg.clk_div = 29493000 / (9600 * 8) - 1;
728 break;
729 case SSP19200:
730 gen_cfg.clk_div = 29493000 / (19200 * 8) - 1;
731 break;
732 case SSP28800:
733 gen_cfg.clk_div = 29493000 / (28800 * 8) - 1;
734 break;
735 case SSP57600:
736 gen_cfg.clk_div = 29493000 / (57600 * 8) - 1;
737 break;
738 case SSP115200:
739 gen_cfg.clk_div = 29493000 / (115200 * 8) - 1;
740 break;
741 case SSP230400:
742 gen_cfg.clk_div = 29493000 / (230400 * 8) - 1;
743 break;
744 case SSP460800:
745 gen_cfg.clk_div = 29493000 / (460800 * 8) - 1;
746 break;
747 case SSP921600:
748 gen_cfg.clk_div = 29493000 / (921600 * 8) - 1;
749 break;
750 case SSP3125000:
751 gen_cfg.base_freq = regk_sser_f100;
752 gen_cfg.clk_div = 100000000 / (3125000 * 8) - 1;
753 break;
754
755 }
756 }
757 frm_cfg.wordrate = GET_WORD_RATE(arg);
758
759 break;
760 case SSP_MODE:
761 switch(arg)
762 {
763 case MASTER_OUTPUT:
764 port->output = 1;
765 port->input = 0;
766 frm_cfg.out_on = regk_sser_tr;
767 frm_cfg.frame_pin_dir = regk_sser_out;
768 gen_cfg.clk_dir = regk_sser_out;
769 break;
770 case SLAVE_OUTPUT:
771 port->output = 1;
772 port->input = 0;
773 frm_cfg.frame_pin_dir = regk_sser_in;
774 gen_cfg.clk_dir = regk_sser_in;
775 break;
776 case MASTER_INPUT:
777 port->output = 0;
778 port->input = 1;
779 frm_cfg.frame_pin_dir = regk_sser_out;
780 frm_cfg.out_on = regk_sser_intern_tb;
781 gen_cfg.clk_dir = regk_sser_out;
782 break;
783 case SLAVE_INPUT:
784 port->output = 0;
785 port->input = 1;
786 frm_cfg.frame_pin_dir = regk_sser_in;
787 gen_cfg.clk_dir = regk_sser_in;
788 break;
789 case MASTER_BIDIR:
790 port->output = 1;
791 port->input = 1;
792 frm_cfg.frame_pin_dir = regk_sser_out;
793 frm_cfg.out_on = regk_sser_intern_tb;
794 gen_cfg.clk_dir = regk_sser_out;
795 break;
796 case SLAVE_BIDIR:
797 port->output = 1;
798 port->input = 1;
799 frm_cfg.frame_pin_dir = regk_sser_in;
800 gen_cfg.clk_dir = regk_sser_in;
801 break;
802 default:
803 spin_unlock_irq(&port->lock);
804 return -EINVAL;
805 }
806 if (!port->use_dma || (arg == MASTER_OUTPUT || arg == SLAVE_OUTPUT))
807 intr_mask.rdav = regk_sser_yes;
808 break;
809 case SSP_FRAME_SYNC:
810 if (arg & NORMAL_SYNC) {
811 frm_cfg.rec_delay = 1;
812 frm_cfg.tr_delay = 1;
813 }
814 else if (arg & EARLY_SYNC)
815 frm_cfg.rec_delay = frm_cfg.tr_delay = 0;
816 else if (arg & SECOND_WORD_SYNC) {
817 frm_cfg.rec_delay = 7;
818 frm_cfg.tr_delay = 1;
819 }
820
821 tr_cfg.bulk_wspace = frm_cfg.tr_delay;
822 frm_cfg.early_wend = regk_sser_yes;
823 if (arg & BIT_SYNC)
824 frm_cfg.type = regk_sser_edge;
825 else if (arg & WORD_SYNC)
826 frm_cfg.type = regk_sser_level;
827 else if (arg & EXTENDED_SYNC)
828 frm_cfg.early_wend = regk_sser_no;
829
830 if (arg & SYNC_ON)
831 frm_cfg.frame_pin_use = regk_sser_frm;
832 else if (arg & SYNC_OFF)
833 frm_cfg.frame_pin_use = regk_sser_gio0;
834
835 dma_w_size = regk_dma_set_w_size2;
836 if (arg & WORD_SIZE_8) {
837 rec_cfg.sample_size = tr_cfg.sample_size = 7;
838 dma_w_size = regk_dma_set_w_size1;
839 } else if (arg & WORD_SIZE_12)
840 rec_cfg.sample_size = tr_cfg.sample_size = 11;
841 else if (arg & WORD_SIZE_16)
842 rec_cfg.sample_size = tr_cfg.sample_size = 15;
843 else if (arg & WORD_SIZE_24)
844 rec_cfg.sample_size = tr_cfg.sample_size = 23;
845 else if (arg & WORD_SIZE_32)
846 rec_cfg.sample_size = tr_cfg.sample_size = 31;
847
848 if (arg & BIT_ORDER_MSB)
849 rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst;
850 else if (arg & BIT_ORDER_LSB)
851 rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_lsbfirst;
852
853 if (arg & FLOW_CONTROL_ENABLE) {
854 frm_cfg.status_pin_use = regk_sser_frm;
855 rec_cfg.fifo_thr = regk_sser_thr16;
856 } else if (arg & FLOW_CONTROL_DISABLE) {
857 frm_cfg.status_pin_use = regk_sser_gio0;
858 rec_cfg.fifo_thr = regk_sser_inf;
859 }
860
861 if (arg & CLOCK_NOT_GATED)
862 gen_cfg.gate_clk = regk_sser_no;
863 else if (arg & CLOCK_GATED)
864 gen_cfg.gate_clk = regk_sser_yes;
865
866 break;
867 case SSP_IPOLARITY:
868 /* NOTE!! negedge is considered NORMAL */
869 if (arg & CLOCK_NORMAL)
870 rec_cfg.clk_pol = regk_sser_neg;
871 else if (arg & CLOCK_INVERT)
872 rec_cfg.clk_pol = regk_sser_pos;
873
874 if (arg & FRAME_NORMAL)
875 frm_cfg.level = regk_sser_pos_hi;
876 else if (arg & FRAME_INVERT)
877 frm_cfg.level = regk_sser_neg_lo;
878
879 if (arg & STATUS_NORMAL)
880 gen_cfg.hold_pol = regk_sser_pos;
881 else if (arg & STATUS_INVERT)
882 gen_cfg.hold_pol = regk_sser_neg;
883 break;
884 case SSP_OPOLARITY:
885 if (arg & CLOCK_NORMAL)
886 gen_cfg.out_clk_pol = regk_sser_pos;
887 else if (arg & CLOCK_INVERT)
888 gen_cfg.out_clk_pol = regk_sser_neg;
889
890 if (arg & FRAME_NORMAL)
891 frm_cfg.level = regk_sser_pos_hi;
892 else if (arg & FRAME_INVERT)
893 frm_cfg.level = regk_sser_neg_lo;
894
895 if (arg & STATUS_NORMAL)
896 gen_cfg.hold_pol = regk_sser_pos;
897 else if (arg & STATUS_INVERT)
898 gen_cfg.hold_pol = regk_sser_neg;
899 break;
900 case SSP_SPI:
901 rec_cfg.fifo_thr = regk_sser_inf;
902 rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst;
903 rec_cfg.sample_size = tr_cfg.sample_size = 7;
904 frm_cfg.frame_pin_use = regk_sser_frm;
905 frm_cfg.type = regk_sser_level;
906 frm_cfg.tr_delay = 1;
907 frm_cfg.level = regk_sser_neg_lo;
908 if (arg & SPI_SLAVE)
909 {
910 rec_cfg.clk_pol = regk_sser_neg;
911 gen_cfg.clk_dir = regk_sser_in;
912 port->input = 1;
913 port->output = 0;
914 }
915 else
916 {
917 gen_cfg.out_clk_pol = regk_sser_pos;
918 port->input = 0;
919 port->output = 1;
920 gen_cfg.clk_dir = regk_sser_out;
921 }
922 break;
923 case SSP_INBUFCHUNK:
924 break;
925 default:
926 return_val = -1;
927 }
928
929
930 if (port->started) {
931 rec_cfg.rec_en = port->input;
932 gen_cfg.en = (port->output | port->input);
933 }
934
935 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
936 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
937 REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg);
938 REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
939 REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg);
940
941
942 if (cmd == SSP_FRAME_SYNC && (arg & (WORD_SIZE_8 | WORD_SIZE_12 |
943 WORD_SIZE_16 | WORD_SIZE_24 | WORD_SIZE_32))) {
944 int en = gen_cfg.en;
945 gen_cfg.en = 0;
946 REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg);
947 /* ##### Should DMA be stoped before we change dma size? */
948 DMA_WR_CMD(port->regi_dmain, dma_w_size);
949 DMA_WR_CMD(port->regi_dmaout, dma_w_size);
950 gen_cfg.en = en;
951 REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg);
952 }
953
954 spin_unlock_irq(&port->lock);
955 return return_val;
956 }
957
958 /* NOTE: sync_serial_write does not support concurrency */
959 static ssize_t sync_serial_write(struct file *file, const char *buf,
960 size_t count, loff_t *ppos)
961 {
962 int dev = iminor(file->f_path.dentry->d_inode);
963 DECLARE_WAITQUEUE(wait, current);
964 struct sync_port *port;
965 int trunc_count;
966 unsigned long flags;
967 int bytes_free;
968 int out_buf_count;
969
970 unsigned char *rd_ptr; /* First allocated byte in the buffer */
971 unsigned char *wr_ptr; /* First free byte in the buffer */
972 unsigned char *buf_stop_ptr; /* Last byte + 1 */
973
974 if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) {
975 DEBUG(printk("Invalid minor %d\n", dev));
976 return -ENODEV;
977 }
978 port = &ports[dev];
979
980 /* |<- OUT_BUFFER_SIZE ->|
981 * |<- out_buf_count ->|
982 * |<- trunc_count ->| ...->|
983 * ______________________________________________________
984 * | free | data | free |
985 * |_________|___________________|________________________|
986 * ^ rd_ptr ^ wr_ptr
987 */
988 DEBUGWRITE(printk(KERN_DEBUG "W d%d c %lu a: %p c: %p\n",
989 port->port_nbr, count, port->active_tr_descr,
990 port->catch_tr_descr));
991
992 /* Read variables that may be updated by interrupts */
993 spin_lock_irqsave(&port->lock, flags);
994 rd_ptr = port->out_rd_ptr;
995 out_buf_count = port->out_buf_count;
996 spin_unlock_irqrestore(&port->lock, flags);
997
998 /* Check if resources are available */
999 if (port->tr_running &&
1000 ((port->use_dma && port->active_tr_descr == port->catch_tr_descr) ||
1001 out_buf_count >= OUT_BUFFER_SIZE)) {
1002 DEBUGWRITE(printk(KERN_DEBUG "sser%d full\n", dev));
1003 return -EAGAIN;
1004 }
1005
1006 buf_stop_ptr = port->out_buffer + OUT_BUFFER_SIZE;
1007
1008 /* Determine pointer to the first free byte, before copying. */
1009 wr_ptr = rd_ptr + out_buf_count;
1010 if (wr_ptr >= buf_stop_ptr)
1011 wr_ptr -= OUT_BUFFER_SIZE;
1012
1013 /* If we wrap the ring buffer, let the user space program handle it by
1014 * truncating the data. This could be more elegant, small buffer
1015 * fragments may occur.
1016 */
1017 bytes_free = OUT_BUFFER_SIZE - out_buf_count;
1018 if (wr_ptr + bytes_free > buf_stop_ptr)
1019 bytes_free = buf_stop_ptr - wr_ptr;
1020 trunc_count = (count < bytes_free) ? count : bytes_free;
1021
1022 if (copy_from_user(wr_ptr, buf, trunc_count))
1023 return -EFAULT;
1024
1025 DEBUGOUTBUF(printk(KERN_DEBUG "%-4d + %-4d = %-4d %p %p %p\n",
1026 out_buf_count, trunc_count,
1027 port->out_buf_count, port->out_buffer,
1028 wr_ptr, buf_stop_ptr));
1029
1030 /* Make sure transmitter/receiver is running */
1031 if (!port->started) {
1032 reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
1033 reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
1034 cfg.en = regk_sser_yes;
1035 rec_cfg.rec_en = port->input;
1036 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
1037 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
1038 port->started = 1;
1039 }
1040
1041 /* Setup wait if blocking */
1042 if (!(file->f_flags & O_NONBLOCK)) {
1043 add_wait_queue(&port->out_wait_q, &wait);
1044 set_current_state(TASK_INTERRUPTIBLE);
1045 }
1046
1047 spin_lock_irqsave(&port->lock, flags);
1048 port->out_buf_count += trunc_count;
1049 if (port->use_dma) {
1050 start_dma_out(port, wr_ptr, trunc_count);
1051 } else if (!port->tr_running) {
1052 reg_sser_rw_intr_mask intr_mask;
1053 intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
1054 /* Start sender by writing data */
1055 send_word(port);
1056 /* and enable transmitter ready IRQ */
1057 intr_mask.trdy = 1;
1058 REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
1059 }
1060 spin_unlock_irqrestore(&port->lock, flags);
1061
1062 /* Exit if non blocking */
1063 if (file->f_flags & O_NONBLOCK) {
1064 DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu %08x\n",
1065 port->port_nbr, trunc_count,
1066 REG_RD_INT(dma, port->regi_dmaout, r_intr)));
1067 return trunc_count;
1068 }
1069
1070 schedule();
1071 set_current_state(TASK_RUNNING);
1072 remove_wait_queue(&port->out_wait_q, &wait);
1073
1074 if (signal_pending(current))
1075 return -EINTR;
1076
1077 DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu\n",
1078 port->port_nbr, trunc_count));
1079 return trunc_count;
1080 }
1081
1082 static ssize_t sync_serial_read(struct file * file, char * buf,
1083 size_t count, loff_t *ppos)
1084 {
1085 int dev = iminor(file->f_path.dentry->d_inode);
1086 int avail;
1087 sync_port *port;
1088 unsigned char* start;
1089 unsigned char* end;
1090 unsigned long flags;
1091
1092 if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
1093 {
1094 DEBUG(printk("Invalid minor %d\n", dev));
1095 return -ENODEV;
1096 }
1097 port = &ports[dev];
1098
1099 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));
1100
1101 if (!port->started)
1102 {
1103 reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
1104 reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
1105 reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
1106 cfg.en = regk_sser_yes;
1107 tr_cfg.tr_en = regk_sser_yes;
1108 rec_cfg.rec_en = regk_sser_yes;
1109 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
1110 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
1111 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
1112 port->started = 1;
1113 }
1114
1115 /* Calculate number of available bytes */
1116 /* Save pointers to avoid that they are modified by interrupt */
1117 spin_lock_irqsave(&port->lock, flags);
1118 start = (unsigned char*)port->readp; /* cast away volatile */
1119 end = (unsigned char*)port->writep; /* cast away volatile */
1120 spin_unlock_irqrestore(&port->lock, flags);
1121 while ((start == end) && !port->full) /* No data */
1122 {
1123 DEBUGREAD(printk(KERN_DEBUG "&"));
1124 if (file->f_flags & O_NONBLOCK)
1125 return -EAGAIN;
1126
1127 interruptible_sleep_on(&port->in_wait_q);
1128 if (signal_pending(current))
1129 return -EINTR;
1130
1131 spin_lock_irqsave(&port->lock, flags);
1132 start = (unsigned char*)port->readp; /* cast away volatile */
1133 end = (unsigned char*)port->writep; /* cast away volatile */
1134 spin_unlock_irqrestore(&port->lock, flags);
1135 }
1136
1137 /* Lazy read, never return wrapped data. */
1138 if (port->full)
1139 avail = port->in_buffer_size;
1140 else if (end > start)
1141 avail = end - start;
1142 else
1143 avail = port->flip + port->in_buffer_size - start;
1144
1145 count = count > avail ? avail : count;
1146 if (copy_to_user(buf, start, count))
1147 return -EFAULT;
1148 /* Disable interrupts while updating readp */
1149 spin_lock_irqsave(&port->lock, flags);
1150 port->readp += count;
1151 if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
1152 port->readp = port->flip;
1153 port->full = 0;
1154 spin_unlock_irqrestore(&port->lock, flags);
1155 DEBUGREAD(printk("r %d\n", count));
1156 return count;
1157 }
1158
1159 static void send_word(sync_port* port)
1160 {
1161 reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
1162 reg_sser_rw_tr_data tr_data = {0};
1163
1164 switch(tr_cfg.sample_size)
1165 {
1166 case 8:
1167 port->out_buf_count--;
1168 tr_data.data = *port->out_rd_ptr++;
1169 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1170 if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
1171 port->out_rd_ptr = port->out_buffer;
1172 break;
1173 case 12:
1174 {
1175 int data = (*port->out_rd_ptr++) << 8;
1176 data |= *port->out_rd_ptr++;
1177 port->out_buf_count -= 2;
1178 tr_data.data = data;
1179 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1180 if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
1181 port->out_rd_ptr = port->out_buffer;
1182 }
1183 break;
1184 case 16:
1185 port->out_buf_count -= 2;
1186 tr_data.data = *(unsigned short *)port->out_rd_ptr;
1187 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1188 port->out_rd_ptr += 2;
1189 if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
1190 port->out_rd_ptr = port->out_buffer;
1191 break;
1192 case 24:
1193 port->out_buf_count -= 3;
1194 tr_data.data = *(unsigned short *)port->out_rd_ptr;
1195 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1196 port->out_rd_ptr += 2;
1197 tr_data.data = *port->out_rd_ptr++;
1198 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1199 if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
1200 port->out_rd_ptr = port->out_buffer;
1201 break;
1202 case 32:
1203 port->out_buf_count -= 4;
1204 tr_data.data = *(unsigned short *)port->out_rd_ptr;
1205 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1206 port->out_rd_ptr += 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 }
1214 }
1215
1216 static void start_dma_out(struct sync_port *port,
1217 const char *data, int count)
1218 {
1219 port->active_tr_descr->buf = (char *) virt_to_phys((char *) data);
1220 port->active_tr_descr->after = port->active_tr_descr->buf + count;
1221 port->active_tr_descr->intr = 1;
1222
1223 port->active_tr_descr->eol = 1;
1224 port->prev_tr_descr->eol = 0;
1225
1226 DEBUGTRDMA(printk(KERN_DEBUG "Inserting eolr:%p eol@:%p\n",
1227 port->prev_tr_descr, port->active_tr_descr));
1228 port->prev_tr_descr = port->active_tr_descr;
1229 port->active_tr_descr = phys_to_virt((int) port->active_tr_descr->next);
1230
1231 if (!port->tr_running) {
1232 reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser,
1233 rw_tr_cfg);
1234
1235 port->out_context.next = 0;
1236 port->out_context.saved_data =
1237 (dma_descr_data *)virt_to_phys(port->prev_tr_descr);
1238 port->out_context.saved_data_buf = port->prev_tr_descr->buf;
1239
1240 DMA_START_CONTEXT(port->regi_dmaout,
1241 virt_to_phys((char *)&port->out_context));
1242
1243 tr_cfg.tr_en = regk_sser_yes;
1244 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
1245 DEBUGTRDMA(printk(KERN_DEBUG "dma s\n"););
1246 } else {
1247 DMA_CONTINUE_DATA(port->regi_dmaout);
1248 DEBUGTRDMA(printk(KERN_DEBUG "dma c\n"););
1249 }
1250
1251 port->tr_running = 1;
1252 }
1253
1254 static void start_dma_in(sync_port *port)
1255 {
1256 int i;
1257 char *buf;
1258 port->writep = port->flip;
1259
1260 if (port->writep > port->flip + port->in_buffer_size) {
1261 panic("Offset too large in sync serial driver\n");
1262 return;
1263 }
1264 buf = (char*)virt_to_phys(port->in_buffer);
1265 for (i = 0; i < NBR_IN_DESCR; i++) {
1266 port->in_descr[i].buf = buf;
1267 port->in_descr[i].after = buf + port->inbufchunk;
1268 port->in_descr[i].intr = 1;
1269 port->in_descr[i].next = (dma_descr_data*)virt_to_phys(&port->in_descr[i+1]);
1270 port->in_descr[i].buf = buf;
1271 buf += port->inbufchunk;
1272 }
1273 /* Link the last descriptor to the first */
1274 port->in_descr[i-1].next = (dma_descr_data*)virt_to_phys(&port->in_descr[0]);
1275 port->in_descr[i-1].eol = regk_sser_yes;
1276 port->next_rx_desc = &port->in_descr[0];
1277 port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR - 1];
1278 port->in_context.saved_data = (dma_descr_data*)virt_to_phys(&port->in_descr[0]);
1279 port->in_context.saved_data_buf = port->in_descr[0].buf;
1280 DMA_START_CONTEXT(port->regi_dmain, virt_to_phys(&port->in_context));
1281 }
1282
1283 #ifdef SYNC_SER_DMA
1284 static irqreturn_t tr_interrupt(int irq, void *dev_id)
1285 {
1286 reg_dma_r_masked_intr masked;
1287 reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes};
1288 reg_dma_rw_stat stat;
1289 int i;
1290 int found = 0;
1291 int stop_sser = 0;
1292
1293 for (i = 0; i < NBR_PORTS; i++) {
1294 sync_port *port = &ports[i];
1295 if (!port->enabled || !port->use_dma)
1296 continue;
1297
1298 /* IRQ active for the port? */
1299 masked = REG_RD(dma, port->regi_dmaout, r_masked_intr);
1300 if (!masked.data)
1301 continue;
1302
1303 found = 1;
1304
1305 /* Check if we should stop the DMA transfer */
1306 stat = REG_RD(dma, port->regi_dmaout, rw_stat);
1307 if (stat.list_state == regk_dma_data_at_eol)
1308 stop_sser = 1;
1309
1310 /* Clear IRQ */
1311 REG_WR(dma, port->regi_dmaout, rw_ack_intr, ack_intr);
1312
1313 if (!stop_sser) {
1314 /* The DMA has completed a descriptor, EOL was not
1315 * encountered, so step relevant descriptor and
1316 * datapointers forward. */
1317 int sent;
1318 sent = port->catch_tr_descr->after -
1319 port->catch_tr_descr->buf;
1320 DEBUGTXINT(printk(KERN_DEBUG "%-4d - %-4d = %-4d\t"
1321 "in descr %p (ac: %p)\n",
1322 port->out_buf_count, sent,
1323 port->out_buf_count - sent,
1324 port->catch_tr_descr,
1325 port->active_tr_descr););
1326 port->out_buf_count -= sent;
1327 port->catch_tr_descr =
1328 phys_to_virt((int) port->catch_tr_descr->next);
1329 port->out_rd_ptr =
1330 phys_to_virt((int) port->catch_tr_descr->buf);
1331 } else {
1332 int i, sent;
1333 /* EOL handler.
1334 * Note that if an EOL was encountered during the irq
1335 * locked section of sync_ser_write the DMA will be
1336 * restarted and the eol flag will be cleared.
1337 * The remaining descriptors will be traversed by
1338 * the descriptor interrupts as usual.
1339 */
1340 i = 0;
1341 while (!port->catch_tr_descr->eol) {
1342 sent = port->catch_tr_descr->after -
1343 port->catch_tr_descr->buf;
1344 DEBUGOUTBUF(printk(KERN_DEBUG
1345 "traversing descr %p -%d (%d)\n",
1346 port->catch_tr_descr,
1347 sent,
1348 port->out_buf_count));
1349 port->out_buf_count -= sent;
1350 port->catch_tr_descr = phys_to_virt(
1351 (int)port->catch_tr_descr->next);
1352 i++;
1353 if (i >= NBR_OUT_DESCR) {
1354 /* TODO: Reset and recover */
1355 panic("sync_serial: missing eol");
1356 }
1357 }
1358 sent = port->catch_tr_descr->after -
1359 port->catch_tr_descr->buf;
1360 DEBUGOUTBUF(printk(KERN_DEBUG
1361 "eol at descr %p -%d (%d)\n",
1362 port->catch_tr_descr,
1363 sent,
1364 port->out_buf_count));
1365
1366 port->out_buf_count -= sent;
1367
1368 /* Update read pointer to first free byte, we
1369 * may already be writing data there. */
1370 port->out_rd_ptr =
1371 phys_to_virt((int) port->catch_tr_descr->after);
1372 if (port->out_rd_ptr > port->out_buffer +
1373 OUT_BUFFER_SIZE)
1374 port->out_rd_ptr = port->out_buffer;
1375
1376 reg_sser_rw_tr_cfg tr_cfg =
1377 REG_RD(sser, port->regi_sser, rw_tr_cfg);
1378 DEBUGTXINT(printk(KERN_DEBUG
1379 "tr_int DMA stop %d, set catch @ %p\n",
1380 port->out_buf_count,
1381 port->active_tr_descr));
1382 if (port->out_buf_count != 0)
1383 printk(KERN_CRIT "sync_ser: buffer not "
1384 "empty after eol.\n");
1385 port->catch_tr_descr = port->active_tr_descr;
1386 port->tr_running = 0;
1387 tr_cfg.tr_en = regk_sser_no;
1388 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
1389 }
1390 /* wake up the waiting process */
1391 wake_up_interruptible(&port->out_wait_q);
1392 }
1393 return IRQ_RETVAL(found);
1394 } /* tr_interrupt */
1395
1396 static irqreturn_t rx_interrupt(int irq, void *dev_id)
1397 {
1398 reg_dma_r_masked_intr masked;
1399 reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes};
1400
1401 int i;
1402 int found = 0;
1403
1404 for (i = 0; i < NBR_PORTS; i++)
1405 {
1406 sync_port *port = &ports[i];
1407
1408 if (!port->enabled || !port->use_dma )
1409 continue;
1410
1411 masked = REG_RD(dma, port->regi_dmain, r_masked_intr);
1412
1413 if (masked.data) /* Descriptor interrupt */
1414 {
1415 found = 1;
1416 while (REG_RD(dma, port->regi_dmain, rw_data) !=
1417 virt_to_phys(port->next_rx_desc)) {
1418 DEBUGRXINT(printk(KERN_DEBUG "!"));
1419 if (port->writep + port->inbufchunk > port->flip + port->in_buffer_size) {
1420 int first_size = port->flip + port->in_buffer_size - port->writep;
1421 memcpy((char*)port->writep, phys_to_virt((unsigned)port->next_rx_desc->buf), first_size);
1422 memcpy(port->flip, phys_to_virt((unsigned)port->next_rx_desc->buf+first_size), port->inbufchunk - first_size);
1423 port->writep = port->flip + port->inbufchunk - first_size;
1424 } else {
1425 memcpy((char*)port->writep,
1426 phys_to_virt((unsigned)port->next_rx_desc->buf),
1427 port->inbufchunk);
1428 port->writep += port->inbufchunk;
1429 if (port->writep >= port->flip + port->in_buffer_size)
1430 port->writep = port->flip;
1431 }
1432 if (port->writep == port->readp)
1433 {
1434 port->full = 1;
1435 }
1436
1437 port->next_rx_desc->eol = 1;
1438 port->prev_rx_desc->eol = 0;
1439 /* Cache bug workaround */
1440 flush_dma_descr(port->prev_rx_desc, 0);
1441 port->prev_rx_desc = port->next_rx_desc;
1442 port->next_rx_desc = phys_to_virt((unsigned)port->next_rx_desc->next);
1443 /* Cache bug workaround */
1444 flush_dma_descr(port->prev_rx_desc, 1);
1445 /* wake up the waiting process */
1446 wake_up_interruptible(&port->in_wait_q);
1447 DMA_CONTINUE(port->regi_dmain);
1448 REG_WR(dma, port->regi_dmain, rw_ack_intr, ack_intr);
1449
1450 }
1451 }
1452 }
1453 return IRQ_RETVAL(found);
1454 } /* rx_interrupt */
1455 #endif /* SYNC_SER_DMA */
1456
1457 #ifdef SYNC_SER_MANUAL
1458 static irqreturn_t manual_interrupt(int irq, void *dev_id)
1459 {
1460 int i;
1461 int found = 0;
1462 reg_sser_r_masked_intr masked;
1463
1464 for (i = 0; i < NBR_PORTS; i++)
1465 {
1466 sync_port *port = &ports[i];
1467
1468 if (!port->enabled || port->use_dma)
1469 {
1470 continue;
1471 }
1472
1473 masked = REG_RD(sser, port->regi_sser, r_masked_intr);
1474 if (masked.rdav) /* Data received? */
1475 {
1476 reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
1477 reg_sser_r_rec_data data = REG_RD(sser, port->regi_sser, r_rec_data);
1478 found = 1;
1479 /* Read data */
1480 switch(rec_cfg.sample_size)
1481 {
1482 case 8:
1483 *port->writep++ = data.data & 0xff;
1484 break;
1485 case 12:
1486 *port->writep = (data.data & 0x0ff0) >> 4;
1487 *(port->writep + 1) = data.data & 0x0f;
1488 port->writep+=2;
1489 break;
1490 case 16:
1491 *(unsigned short*)port->writep = data.data;
1492 port->writep+=2;
1493 break;
1494 case 24:
1495 *(unsigned int*)port->writep = data.data;
1496 port->writep+=3;
1497 break;
1498 case 32:
1499 *(unsigned int*)port->writep = data.data;
1500 port->writep+=4;
1501 break;
1502 }
1503
1504 if (port->writep >= port->flip + port->in_buffer_size) /* Wrap? */
1505 port->writep = port->flip;
1506 if (port->writep == port->readp) {
1507 /* receive buffer overrun, discard oldest data
1508 */
1509 port->readp++;
1510 if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
1511 port->readp = port->flip;
1512 }
1513 if (sync_data_avail(port) >= port->inbufchunk)
1514 wake_up_interruptible(&port->in_wait_q); /* Wake up application */
1515 }
1516
1517 if (masked.trdy) /* Transmitter ready? */
1518 {
1519 found = 1;
1520 if (port->out_buf_count > 0) /* More data to send */
1521 send_word(port);
1522 else /* transmission finished */
1523 {
1524 reg_sser_rw_intr_mask intr_mask;
1525 intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
1526 intr_mask.trdy = 0;
1527 REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
1528 wake_up_interruptible(&port->out_wait_q); /* Wake up application */
1529 }
1530 }
1531 }
1532 return IRQ_RETVAL(found);
1533 }
1534 #endif
1535
1536 module_init(etrax_sync_serial_init);
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