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[hh.org.git] / arch / cris / arch-v32 / drivers / sync_serial.c
blobe067806b2208b67b63ad419bb25ea0dd967d9ed5
1 /*
2 * Simple synchronous serial port driver for ETRAX FS.
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 <asm/arch/dma.h>
25 #include <asm/arch/pinmux.h>
26 #include <asm/arch/hwregs/reg_rdwr.h>
27 #include <asm/arch/hwregs/sser_defs.h>
28 #include <asm/arch/hwregs/dma_defs.h>
29 #include <asm/arch/hwregs/dma.h>
30 #include <asm/arch/hwregs/intr_vect_defs.h>
31 #include <asm/arch/hwregs/intr_vect.h>
32 #include <asm/arch/hwregs/reg_map.h>
33 #include <asm/sync_serial.h>
34
35 /* The receiver is a bit tricky beacuse of the continuous stream of data.*/
36 /* */
37 /* Three DMA descriptors are linked together. Each DMA descriptor is */
38 /* responsible for port->bufchunk of a common buffer. */
39 /* */
40 /* +---------------------------------------------+ */
41 /* | +----------+ +----------+ +----------+ | */
42 /* +-> | Descr[0] |-->| Descr[1] |-->| Descr[2] |-+ */
43 /* +----------+ +----------+ +----------+ */
44 /* | | | */
45 /* v v v */
46 /* +-------------------------------------+ */
47 /* | BUFFER | */
48 /* +-------------------------------------+ */
49 /* |<- data_avail ->| */
50 /* readp writep */
51 /* */
52 /* If the application keeps up the pace readp will be right after writep.*/
53 /* If the application can't keep the pace we have to throw away data. */
54 /* The idea is that readp should be ready with the data pointed out by */
55 /* Descr[i] when the DMA has filled in Descr[i+1]. */
56 /* Otherwise we will discard */
57 /* the rest of the data pointed out by Descr1 and set readp to the start */
58 /* of Descr2 */
59
60 #define SYNC_SERIAL_MAJOR 125
61
62 /* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */
63 /* words can be handled */
64 #define IN_BUFFER_SIZE 12288
65 #define IN_DESCR_SIZE 256
66 #define NUM_IN_DESCR (IN_BUFFER_SIZE/IN_DESCR_SIZE)
67 #define OUT_BUFFER_SIZE 4096
68
69 #define DEFAULT_FRAME_RATE 0
70 #define DEFAULT_WORD_RATE 7
71
72 /* NOTE: Enabling some debug will likely cause overrun or underrun,
73 * especially if manual mode is use.
74 */
75 #define DEBUG(x)
76 #define DEBUGREAD(x)
77 #define DEBUGWRITE(x)
78 #define DEBUGPOLL(x)
79 #define DEBUGRXINT(x)
80 #define DEBUGTXINT(x)
81
82 typedef struct sync_port
83 {
84 reg_scope_instances regi_sser;
85 reg_scope_instances regi_dmain;
86 reg_scope_instances regi_dmaout;
87
88 char started; /* 1 if port has been started */
89 char port_nbr; /* Port 0 or 1 */
90 char busy; /* 1 if port is busy */
91
92 char enabled; /* 1 if port is enabled */
93 char use_dma; /* 1 if port uses dma */
94 char tr_running;
95
96 char init_irqs;
97 int output;
98 int input;
99
100 volatile unsigned int out_count; /* Remaining bytes for current transfer */
101 unsigned char* outp; /* Current position in out_buffer */
102 volatile unsigned char* volatile readp; /* Next byte to be read by application */
103 volatile unsigned char* volatile writep; /* Next byte to be written by etrax */
104 unsigned int in_buffer_size;
105 unsigned int inbufchunk;
106 unsigned char out_buffer[OUT_BUFFER_SIZE] __attribute__ ((aligned(32)));
107 unsigned char in_buffer[IN_BUFFER_SIZE]__attribute__ ((aligned(32)));
108 unsigned char flip[IN_BUFFER_SIZE] __attribute__ ((aligned(32)));
109 struct dma_descr_data* next_rx_desc;
110 struct dma_descr_data* prev_rx_desc;
111 int full;
112
113 dma_descr_data in_descr[NUM_IN_DESCR] __attribute__ ((__aligned__(16)));
114 dma_descr_context in_context __attribute__ ((__aligned__(32)));
115 dma_descr_data out_descr __attribute__ ((__aligned__(16)));
116 dma_descr_context out_context __attribute__ ((__aligned__(32)));
117 wait_queue_head_t out_wait_q;
118 wait_queue_head_t in_wait_q;
119
120 spinlock_t lock;
121 } sync_port;
122
123 static int etrax_sync_serial_init(void);
124 static void initialize_port(int portnbr);
125 static inline int sync_data_avail(struct sync_port *port);
126
127 static int sync_serial_open(struct inode *, struct file*);
128 static int sync_serial_release(struct inode*, struct file*);
129 static unsigned int sync_serial_poll(struct file *filp, poll_table *wait);
130
131 static int sync_serial_ioctl(struct inode*, struct file*,
132 unsigned int cmd, unsigned long arg);
133 static ssize_t sync_serial_write(struct file * file, const char * buf,
134 size_t count, loff_t *ppos);
135 static ssize_t sync_serial_read(struct file *file, char *buf,
136 size_t count, loff_t *ppos);
137
138 #if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
139 defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
140 (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
141 defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))
142 #define SYNC_SER_DMA
143 #endif
144
145 static void send_word(sync_port* port);
146 static void start_dma(struct sync_port *port, const char* data, int count);
147 static void start_dma_in(sync_port* port);
148 #ifdef SYNC_SER_DMA
149 static irqreturn_t tr_interrupt(int irq, void *dev_id, struct pt_regs * regs);
150 static irqreturn_t rx_interrupt(int irq, void *dev_id, struct pt_regs * regs);
151 #endif
152
153 #if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
154 !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
155 (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
156 !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))
157 #define SYNC_SER_MANUAL
158 #endif
159 #ifdef SYNC_SER_MANUAL
160 static irqreturn_t manual_interrupt(int irq, void *dev_id, struct pt_regs * regs);
161 #endif
162
163 /* The ports */
164 static struct sync_port ports[]=
165 {
166 {
167 .regi_sser = regi_sser0,
168 .regi_dmaout = regi_dma4,
169 .regi_dmain = regi_dma5,
170 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)
171 .use_dma = 1,
172 #else
173 .use_dma = 0,
174 #endif
175 },
176 {
177 .regi_sser = regi_sser1,
178 .regi_dmaout = regi_dma6,
179 .regi_dmain = regi_dma7,
180 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)
181 .use_dma = 1,
182 #else
183 .use_dma = 0,
184 #endif
185 }
186 };
187
188 #define NUMBER_OF_PORTS (sizeof(ports)/sizeof(sync_port))
189
190 static struct file_operations sync_serial_fops = {
191 .owner = THIS_MODULE,
192 .write = sync_serial_write,
193 .read = sync_serial_read,
194 .poll = sync_serial_poll,
195 .ioctl = sync_serial_ioctl,
196 .open = sync_serial_open,
197 .release = sync_serial_release
198 };
199
200 static int __init etrax_sync_serial_init(void)
201 {
202 ports[0].enabled = 0;
203 ports[1].enabled = 0;
204
205 if (register_chrdev(SYNC_SERIAL_MAJOR,"sync serial", &sync_serial_fops) <0 )
206 {
207 printk("unable to get major for synchronous serial port\n");
208 return -EBUSY;
209 }
210
211 /* Initialize Ports */
212 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
213 if (crisv32_pinmux_alloc_fixed(pinmux_sser0))
214 {
215 printk("Unable to allocate pins for syncrhronous serial port 0\n");
216 return -EIO;
217 }
218 ports[0].enabled = 1;
219 initialize_port(0);
220 #endif
221
222 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
223 if (crisv32_pinmux_alloc_fixed(pinmux_sser1))
224 {
225 printk("Unable to allocate pins for syncrhronous serial port 0\n");
226 return -EIO;
227 }
228 ports[1].enabled = 1;
229 initialize_port(1);
230 #endif
231
232 printk("ETRAX FS synchronous serial port driver\n");
233 return 0;
234 }
235
236 static void __init initialize_port(int portnbr)
237 {
238 struct sync_port* port = &ports[portnbr];
239 reg_sser_rw_cfg cfg = {0};
240 reg_sser_rw_frm_cfg frm_cfg = {0};
241 reg_sser_rw_tr_cfg tr_cfg = {0};
242 reg_sser_rw_rec_cfg rec_cfg = {0};
243
244 DEBUG(printk("Init sync serial port %d\n", portnbr));
245
246 port->port_nbr = portnbr;
247 port->init_irqs = 1;
248
249 port->outp = port->out_buffer;
250 port->output = 1;
251 port->input = 0;
252
253 port->readp = port->flip;
254 port->writep = port->flip;
255 port->in_buffer_size = IN_BUFFER_SIZE;
256 port->inbufchunk = IN_DESCR_SIZE;
257 port->next_rx_desc = &port->in_descr[0];
258 port->prev_rx_desc = &port->in_descr[NUM_IN_DESCR-1];
259 port->prev_rx_desc->eol = 1;
260
261 init_waitqueue_head(&port->out_wait_q);
262 init_waitqueue_head(&port->in_wait_q);
263
264 spin_lock_init(&port->lock);
265
266 cfg.out_clk_src = regk_sser_intern_clk;
267 cfg.out_clk_pol = regk_sser_pos;
268 cfg.clk_od_mode = regk_sser_no;
269 cfg.clk_dir = regk_sser_out;
270 cfg.gate_clk = regk_sser_no;
271 cfg.base_freq = regk_sser_f29_493;
272 cfg.clk_div = 256;
273 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
274
275 frm_cfg.wordrate = DEFAULT_WORD_RATE;
276 frm_cfg.type = regk_sser_edge;
277 frm_cfg.frame_pin_dir = regk_sser_out;
278 frm_cfg.frame_pin_use = regk_sser_frm;
279 frm_cfg.status_pin_dir = regk_sser_in;
280 frm_cfg.status_pin_use = regk_sser_hold;
281 frm_cfg.out_on = regk_sser_tr;
282 frm_cfg.tr_delay = 1;
283 REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg);
284
285 tr_cfg.urun_stop = regk_sser_no;
286 tr_cfg.sample_size = 7;
287 tr_cfg.sh_dir = regk_sser_msbfirst;
288 tr_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no;
289 tr_cfg.rate_ctrl = regk_sser_bulk;
290 tr_cfg.data_pin_use = regk_sser_dout;
291 tr_cfg.bulk_wspace = 1;
292 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
293
294 rec_cfg.sample_size = 7;
295 rec_cfg.sh_dir = regk_sser_msbfirst;
296 rec_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no;
297 rec_cfg.fifo_thr = regk_sser_inf;
298 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
299 }
300
301 static inline int sync_data_avail(struct sync_port *port)
302 {
303 int avail;
304 unsigned char *start;
305 unsigned char *end;
306
307 start = (unsigned char*)port->readp; /* cast away volatile */
308 end = (unsigned char*)port->writep; /* cast away volatile */
309 /* 0123456789 0123456789
310 * ----- - -----
311 * ^rp ^wp ^wp ^rp
312 */
313
314 if (end >= start)
315 avail = end - start;
316 else
317 avail = port->in_buffer_size - (start - end);
318 return avail;
319 }
320
321 static inline int sync_data_avail_to_end(struct sync_port *port)
322 {
323 int avail;
324 unsigned char *start;
325 unsigned char *end;
326
327 start = (unsigned char*)port->readp; /* cast away volatile */
328 end = (unsigned char*)port->writep; /* cast away volatile */
329 /* 0123456789 0123456789
330 * ----- -----
331 * ^rp ^wp ^wp ^rp
332 */
333
334 if (end >= start)
335 avail = end - start;
336 else
337 avail = port->flip + port->in_buffer_size - start;
338 return avail;
339 }
340
341 static int sync_serial_open(struct inode *inode, struct file *file)
342 {
343 int dev = iminor(inode);
344 sync_port* port;
345 reg_dma_rw_cfg cfg = {.en = regk_dma_yes};
346 reg_dma_rw_intr_mask intr_mask = {.data = regk_dma_yes};
347
348 DEBUG(printk("Open sync serial port %d\n", dev));
349
350 if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
351 {
352 DEBUG(printk("Invalid minor %d\n", dev));
353 return -ENODEV;
354 }
355 port = &ports[dev];
356 /* Allow open this device twice (assuming one reader and one writer) */
357 if (port->busy == 2)
358 {
359 DEBUG(printk("Device is busy.. \n"));
360 return -EBUSY;
361 }
362 if (port->init_irqs) {
363 if (port->use_dma) {
364 if (port == &ports[0]){
365 #ifdef SYNC_SER_DMA
366 if(request_irq(DMA4_INTR_VECT,
367 tr_interrupt,
368 0,
369 "synchronous serial 0 dma tr",
370 &ports[0])) {
371 printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
372 return -EBUSY;
373 } else if(request_irq(DMA5_INTR_VECT,
374 rx_interrupt,
375 0,
376 "synchronous serial 1 dma rx",
377 &ports[0])) {
378 free_irq(DMA4_INTR_VECT, &port[0]);
379 printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
380 return -EBUSY;
381 } else if (crisv32_request_dma(SYNC_SER0_TX_DMA_NBR,
382 "synchronous serial 0 dma tr",
383 DMA_VERBOSE_ON_ERROR,
384 0,
385 dma_sser0)) {
386 free_irq(DMA4_INTR_VECT, &port[0]);
387 free_irq(DMA5_INTR_VECT, &port[0]);
388 printk(KERN_CRIT "Can't allocate sync serial port 0 TX DMA channel");
389 return -EBUSY;
390 } else if (crisv32_request_dma(SYNC_SER0_RX_DMA_NBR,
391 "synchronous serial 0 dma rec",
392 DMA_VERBOSE_ON_ERROR,
393 0,
394 dma_sser0)) {
395 crisv32_free_dma(SYNC_SER0_TX_DMA_NBR);
396 free_irq(DMA4_INTR_VECT, &port[0]);
397 free_irq(DMA5_INTR_VECT, &port[0]);
398 printk(KERN_CRIT "Can't allocate sync serial port 1 RX DMA channel");
399 return -EBUSY;
400 }
401 #endif
402 }
403 else if (port == &ports[1]){
404 #ifdef SYNC_SER_DMA
405 if (request_irq(DMA6_INTR_VECT,
406 tr_interrupt,
407 0,
408 "synchronous serial 1 dma tr",
409 &ports[1])) {
410 printk(KERN_CRIT "Can't allocate sync serial port 1 IRQ");
411 return -EBUSY;
412 } else if (request_irq(DMA7_INTR_VECT,
413 rx_interrupt,
414 0,
415 "synchronous serial 1 dma rx",
416 &ports[1])) {
417 free_irq(DMA6_INTR_VECT, &ports[1]);
418 printk(KERN_CRIT "Can't allocate sync serial port 3 IRQ");
419 return -EBUSY;
420 } else if (crisv32_request_dma(SYNC_SER1_TX_DMA_NBR,
421 "synchronous serial 1 dma tr",
422 DMA_VERBOSE_ON_ERROR,
423 0,
424 dma_sser1)) {
425 free_irq(21, &ports[1]);
426 free_irq(20, &ports[1]);
427 printk(KERN_CRIT "Can't allocate sync serial port 3 TX DMA channel");
428 return -EBUSY;
429 } else if (crisv32_request_dma(SYNC_SER1_RX_DMA_NBR,
430 "synchronous serial 3 dma rec",
431 DMA_VERBOSE_ON_ERROR,
432 0,
433 dma_sser1)) {
434 crisv32_free_dma(SYNC_SER1_TX_DMA_NBR);
435 free_irq(DMA6_INTR_VECT, &ports[1]);
436 free_irq(DMA7_INTR_VECT, &ports[1]);
437 printk(KERN_CRIT "Can't allocate sync serial port 3 RX DMA channel");
438 return -EBUSY;
439 }
440 #endif
441 }
442
443 /* Enable DMAs */
444 REG_WR(dma, port->regi_dmain, rw_cfg, cfg);
445 REG_WR(dma, port->regi_dmaout, rw_cfg, cfg);
446 /* Enable DMA IRQs */
447 REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask);
448 REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask);
449 /* Set up wordsize = 2 for DMAs. */
450 DMA_WR_CMD (port->regi_dmain, regk_dma_set_w_size1);
451 DMA_WR_CMD (port->regi_dmaout, regk_dma_set_w_size1);
452
453 start_dma_in(port);
454 port->init_irqs = 0;
455 } else { /* !port->use_dma */
456 #ifdef SYNC_SER_MANUAL
457 if (port == &ports[0]) {
458 if (request_irq(SSER0_INTR_VECT,
459 manual_interrupt,
460 0,
461 "synchronous serial manual irq",
462 &ports[0])) {
463 printk("Can't allocate sync serial manual irq");
464 return -EBUSY;
465 }
466 } else if (port == &ports[1]) {
467 if (request_irq(SSER1_INTR_VECT,
468 manual_interrupt,
469 0,
470 "synchronous serial manual irq",
471 &ports[1])) {
472 printk(KERN_CRIT "Can't allocate sync serial manual irq");
473 return -EBUSY;
474 }
475 }
476 port->init_irqs = 0;
477 #else
478 panic("sync_serial: Manual mode not supported.\n");
479 #endif /* SYNC_SER_MANUAL */
480 }
481 } /* port->init_irqs */
482
483 port->busy++;
484 return 0;
485 }
486
487 static int sync_serial_release(struct inode *inode, struct file *file)
488 {
489 int dev = iminor(inode);
490 sync_port* port;
491
492 if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
493 {
494 DEBUG(printk("Invalid minor %d\n", dev));
495 return -ENODEV;
496 }
497 port = &ports[dev];
498 if (port->busy)
499 port->busy--;
500 if (!port->busy)
501 /* XXX */ ;
502 return 0;
503 }
504
505 static unsigned int sync_serial_poll(struct file *file, poll_table *wait)
506 {
507 int dev = iminor(file->f_dentry->d_inode);
508 unsigned int mask = 0;
509 sync_port* port;
510 DEBUGPOLL( static unsigned int prev_mask = 0; );
511
512 port = &ports[dev];
513 poll_wait(file, &port->out_wait_q, wait);
514 poll_wait(file, &port->in_wait_q, wait);
515 /* Some room to write */
516 if (port->out_count < OUT_BUFFER_SIZE)
517 mask |= POLLOUT | POLLWRNORM;
518 /* At least an inbufchunk of data */
519 if (sync_data_avail(port) >= port->inbufchunk)
520 mask |= POLLIN | POLLRDNORM;
521
522 DEBUGPOLL(if (mask != prev_mask)
523 printk("sync_serial_poll: mask 0x%08X %s %s\n", mask,
524 mask&POLLOUT?"POLLOUT":"", mask&POLLIN?"POLLIN":"");
525 prev_mask = mask;
526 );
527 return mask;
528 }
529
530 static int sync_serial_ioctl(struct inode *inode, struct file *file,
531 unsigned int cmd, unsigned long arg)
532 {
533 int return_val = 0;
534 int dev = iminor(file->f_dentry->d_inode);
535 sync_port* port;
536 reg_sser_rw_tr_cfg tr_cfg;
537 reg_sser_rw_rec_cfg rec_cfg;
538 reg_sser_rw_frm_cfg frm_cfg;
539 reg_sser_rw_cfg gen_cfg;
540 reg_sser_rw_intr_mask intr_mask;
541
542 if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
543 {
544 DEBUG(printk("Invalid minor %d\n", dev));
545 return -1;
546 }
547 port = &ports[dev];
548 spin_lock_irq(&port->lock);
549
550 tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
551 rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
552 frm_cfg = REG_RD(sser, port->regi_sser, rw_frm_cfg);
553 gen_cfg = REG_RD(sser, port->regi_sser, rw_cfg);
554 intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
555
556 switch(cmd)
557 {
558 case SSP_SPEED:
559 if (GET_SPEED(arg) == CODEC)
560 {
561 gen_cfg.base_freq = regk_sser_f32;
562 /* FREQ = 0 => 4 MHz => clk_div = 7*/
563 gen_cfg.clk_div = 6 + (1 << GET_FREQ(arg));
564 }
565 else
566 {
567 gen_cfg.base_freq = regk_sser_f29_493;
568 switch (GET_SPEED(arg))
569 {
570 case SSP150:
571 gen_cfg.clk_div = 29493000 / (150 * 8) - 1;
572 break;
573 case SSP300:
574 gen_cfg.clk_div = 29493000 / (300 * 8) - 1;
575 break;
576 case SSP600:
577 gen_cfg.clk_div = 29493000 / (600 * 8) - 1;
578 break;
579 case SSP1200:
580 gen_cfg.clk_div = 29493000 / (1200 * 8) - 1;
581 break;
582 case SSP2400:
583 gen_cfg.clk_div = 29493000 / (2400 * 8) - 1;
584 break;
585 case SSP4800:
586 gen_cfg.clk_div = 29493000 / (4800 * 8) - 1;
587 break;
588 case SSP9600:
589 gen_cfg.clk_div = 29493000 / (9600 * 8) - 1;
590 break;
591 case SSP19200:
592 gen_cfg.clk_div = 29493000 / (19200 * 8) - 1;
593 break;
594 case SSP28800:
595 gen_cfg.clk_div = 29493000 / (28800 * 8) - 1;
596 break;
597 case SSP57600:
598 gen_cfg.clk_div = 29493000 / (57600 * 8) - 1;
599 break;
600 case SSP115200:
601 gen_cfg.clk_div = 29493000 / (115200 * 8) - 1;
602 break;
603 case SSP230400:
604 gen_cfg.clk_div = 29493000 / (230400 * 8) - 1;
605 break;
606 case SSP460800:
607 gen_cfg.clk_div = 29493000 / (460800 * 8) - 1;
608 break;
609 case SSP921600:
610 gen_cfg.clk_div = 29493000 / (921600 * 8) - 1;
611 break;
612 case SSP3125000:
613 gen_cfg.base_freq = regk_sser_f100;
614 gen_cfg.clk_div = 100000000 / (3125000 * 8) - 1;
615 break;
616
617 }
618 }
619 frm_cfg.wordrate = GET_WORD_RATE(arg);
620
621 break;
622 case SSP_MODE:
623 switch(arg)
624 {
625 case MASTER_OUTPUT:
626 port->output = 1;
627 port->input = 0;
628 gen_cfg.clk_dir = regk_sser_out;
629 break;
630 case SLAVE_OUTPUT:
631 port->output = 1;
632 port->input = 0;
633 gen_cfg.clk_dir = regk_sser_in;
634 break;
635 case MASTER_INPUT:
636 port->output = 0;
637 port->input = 1;
638 gen_cfg.clk_dir = regk_sser_out;
639 break;
640 case SLAVE_INPUT:
641 port->output = 0;
642 port->input = 1;
643 gen_cfg.clk_dir = regk_sser_in;
644 break;
645 case MASTER_BIDIR:
646 port->output = 1;
647 port->input = 1;
648 gen_cfg.clk_dir = regk_sser_out;
649 break;
650 case SLAVE_BIDIR:
651 port->output = 1;
652 port->input = 1;
653 gen_cfg.clk_dir = regk_sser_in;
654 break;
655 default:
656 spin_unlock_irq(&port->lock);
657 return -EINVAL;
658
659 }
660 if (!port->use_dma || (arg == MASTER_OUTPUT || arg == SLAVE_OUTPUT))
661 intr_mask.rdav = regk_sser_yes;
662 break;
663 case SSP_FRAME_SYNC:
664 if (arg & NORMAL_SYNC)
665 frm_cfg.tr_delay = 1;
666 else if (arg & EARLY_SYNC)
667 frm_cfg.tr_delay = 0;
668
669 tr_cfg.bulk_wspace = frm_cfg.tr_delay;
670 frm_cfg.early_wend = regk_sser_yes;
671 if (arg & BIT_SYNC)
672 frm_cfg.type = regk_sser_edge;
673 else if (arg & WORD_SYNC)
674 frm_cfg.type = regk_sser_level;
675 else if (arg & EXTENDED_SYNC)
676 frm_cfg.early_wend = regk_sser_no;
677
678 if (arg & SYNC_ON)
679 frm_cfg.frame_pin_use = regk_sser_frm;
680 else if (arg & SYNC_OFF)
681 frm_cfg.frame_pin_use = regk_sser_gio0;
682
683 if (arg & WORD_SIZE_8)
684 rec_cfg.sample_size = tr_cfg.sample_size = 7;
685 else if (arg & WORD_SIZE_12)
686 rec_cfg.sample_size = tr_cfg.sample_size = 11;
687 else if (arg & WORD_SIZE_16)
688 rec_cfg.sample_size = tr_cfg.sample_size = 15;
689 else if (arg & WORD_SIZE_24)
690 rec_cfg.sample_size = tr_cfg.sample_size = 23;
691 else if (arg & WORD_SIZE_32)
692 rec_cfg.sample_size = tr_cfg.sample_size = 31;
693
694 if (arg & BIT_ORDER_MSB)
695 rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst;
696 else if (arg & BIT_ORDER_LSB)
697 rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_lsbfirst;
698
699 if (arg & FLOW_CONTROL_ENABLE)
700 rec_cfg.fifo_thr = regk_sser_thr16;
701 else if (arg & FLOW_CONTROL_DISABLE)
702 rec_cfg.fifo_thr = regk_sser_inf;
703
704 if (arg & CLOCK_NOT_GATED)
705 gen_cfg.gate_clk = regk_sser_no;
706 else if (arg & CLOCK_GATED)
707 gen_cfg.gate_clk = regk_sser_yes;
708
709 break;
710 case SSP_IPOLARITY:
711 /* NOTE!! negedge is considered NORMAL */
712 if (arg & CLOCK_NORMAL)
713 rec_cfg.clk_pol = regk_sser_neg;
714 else if (arg & CLOCK_INVERT)
715 rec_cfg.clk_pol = regk_sser_pos;
716
717 if (arg & FRAME_NORMAL)
718 frm_cfg.level = regk_sser_pos_hi;
719 else if (arg & FRAME_INVERT)
720 frm_cfg.level = regk_sser_neg_lo;
721
722 if (arg & STATUS_NORMAL)
723 gen_cfg.hold_pol = regk_sser_pos;
724 else if (arg & STATUS_INVERT)
725 gen_cfg.hold_pol = regk_sser_neg;
726 break;
727 case SSP_OPOLARITY:
728 if (arg & CLOCK_NORMAL)
729 gen_cfg.out_clk_pol = regk_sser_neg;
730 else if (arg & CLOCK_INVERT)
731 gen_cfg.out_clk_pol = regk_sser_pos;
732
733 if (arg & FRAME_NORMAL)
734 frm_cfg.level = regk_sser_pos_hi;
735 else if (arg & FRAME_INVERT)
736 frm_cfg.level = regk_sser_neg_lo;
737
738 if (arg & STATUS_NORMAL)
739 gen_cfg.hold_pol = regk_sser_pos;
740 else if (arg & STATUS_INVERT)
741 gen_cfg.hold_pol = regk_sser_neg;
742 break;
743 case SSP_SPI:
744 rec_cfg.fifo_thr = regk_sser_inf;
745 rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst;
746 rec_cfg.sample_size = tr_cfg.sample_size = 7;
747 frm_cfg.frame_pin_use = regk_sser_frm;
748 frm_cfg.type = regk_sser_level;
749 frm_cfg.tr_delay = 1;
750 frm_cfg.level = regk_sser_neg_lo;
751 if (arg & SPI_SLAVE)
752 {
753 rec_cfg.clk_pol = regk_sser_neg;
754 gen_cfg.clk_dir = regk_sser_in;
755 port->input = 1;
756 port->output = 0;
757 }
758 else
759 {
760 gen_cfg.out_clk_pol = regk_sser_pos;
761 port->input = 0;
762 port->output = 1;
763 gen_cfg.clk_dir = regk_sser_out;
764 }
765 break;
766 case SSP_INBUFCHUNK:
767 break;
768 default:
769 return_val = -1;
770 }
771
772
773 if (port->started)
774 {
775 tr_cfg.tr_en = port->output;
776 rec_cfg.rec_en = port->input;
777 }
778
779 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
780 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
781 REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg);
782 REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
783 REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg);
784
785 spin_unlock_irq(&port->lock);
786 return return_val;
787 }
788
789 static ssize_t sync_serial_write(struct file * file, const char * buf,
790 size_t count, loff_t *ppos)
791 {
792 int dev = iminor(file->f_dentry->d_inode);
793 DECLARE_WAITQUEUE(wait, current);
794 sync_port *port;
795 unsigned long c, c1;
796 unsigned long free_outp;
797 unsigned long outp;
798 unsigned long out_buffer;
799 unsigned long flags;
800
801 if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
802 {
803 DEBUG(printk("Invalid minor %d\n", dev));
804 return -ENODEV;
805 }
806 port = &ports[dev];
807
808 DEBUGWRITE(printk("W d%d c %lu (%d/%d)\n", port->port_nbr, count, port->out_count, OUT_BUFFER_SIZE));
809 /* Space to end of buffer */
810 /*
811 * out_buffer <c1>012345<- c ->OUT_BUFFER_SIZE
812 * outp^ +out_count
813 ^free_outp
814 * out_buffer 45<- c ->0123OUT_BUFFER_SIZE
815 * +out_count outp^
816 * free_outp
817 *
818 */
819
820 /* Read variables that may be updated by interrupts */
821 spin_lock_irqsave(&port->lock, flags);
822 count = count > OUT_BUFFER_SIZE - port->out_count ? OUT_BUFFER_SIZE - port->out_count : count;
823 outp = (unsigned long)port->outp;
824 free_outp = outp + port->out_count;
825 spin_unlock_irqrestore(&port->lock, flags);
826 out_buffer = (unsigned long)port->out_buffer;
827
828 /* Find out where and how much to write */
829 if (free_outp >= out_buffer + OUT_BUFFER_SIZE)
830 free_outp -= OUT_BUFFER_SIZE;
831 if (free_outp >= outp)
832 c = out_buffer + OUT_BUFFER_SIZE - free_outp;
833 else
834 c = outp - free_outp;
835 if (c > count)
836 c = count;
837
838 // DEBUGWRITE(printk("w op %08lX fop %08lX c %lu\n", outp, free_outp, c));
839 if (copy_from_user((void*)free_outp, buf, c))
840 return -EFAULT;
841
842 if (c != count) {
843 buf += c;
844 c1 = count - c;
845 DEBUGWRITE(printk("w2 fi %lu c %lu c1 %lu\n", free_outp-out_buffer, c, c1));
846 if (copy_from_user((void*)out_buffer, buf, c1))
847 return -EFAULT;
848 }
849 spin_lock_irqsave(&port->lock, flags);
850 port->out_count += count;
851 spin_unlock_irqrestore(&port->lock, flags);
852
853 /* Make sure transmitter/receiver is running */
854 if (!port->started)
855 {
856 reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
857 reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
858 reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
859 cfg.en = regk_sser_yes;
860 tr_cfg.tr_en = port->output;
861 rec_cfg.rec_en = port->input;
862 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
863 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
864 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
865 port->started = 1;
866 }
867
868 if (file->f_flags & O_NONBLOCK) {
869 spin_lock_irqsave(&port->lock, flags);
870 if (!port->tr_running) {
871 if (!port->use_dma) {
872 reg_sser_rw_intr_mask intr_mask;
873 intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
874 /* Start sender by writing data */
875 send_word(port);
876 /* and enable transmitter ready IRQ */
877 intr_mask.trdy = 1;
878 REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
879 } else {
880 start_dma(port, (unsigned char* volatile )port->outp, c);
881 }
882 }
883 spin_unlock_irqrestore(&port->lock, flags);
884 DEBUGWRITE(printk("w d%d c %lu NB\n",
885 port->port_nbr, count));
886 return count;
887 }
888
889 /* Sleep until all sent */
890
891 add_wait_queue(&port->out_wait_q, &wait);
892 set_current_state(TASK_INTERRUPTIBLE);
893 spin_lock_irqsave(&port->lock, flags);
894 if (!port->tr_running) {
895 if (!port->use_dma) {
896 reg_sser_rw_intr_mask intr_mask;
897 intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
898 /* Start sender by writing data */
899 send_word(port);
900 /* and enable transmitter ready IRQ */
901 intr_mask.trdy = 1;
902 REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
903 } else {
904 start_dma(port, port->outp, c);
905 }
906 }
907 spin_unlock_irqrestore(&port->lock, flags);
908 schedule();
909 set_current_state(TASK_RUNNING);
910 remove_wait_queue(&port->out_wait_q, &wait);
911 if (signal_pending(current))
912 {
913 return -EINTR;
914 }
915 DEBUGWRITE(printk("w d%d c %lu\n", port->port_nbr, count));
916 return count;
917 }
918
919 static ssize_t sync_serial_read(struct file * file, char * buf,
920 size_t count, loff_t *ppos)
921 {
922 int dev = iminor(file->f_dentry->d_inode);
923 int avail;
924 sync_port *port;
925 unsigned char* start;
926 unsigned char* end;
927 unsigned long flags;
928
929 if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
930 {
931 DEBUG(printk("Invalid minor %d\n", dev));
932 return -ENODEV;
933 }
934 port = &ports[dev];
935
936 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));
937
938 if (!port->started)
939 {
940 reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
941 reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
942 reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
943 cfg.en = regk_sser_yes;
944 tr_cfg.tr_en = regk_sser_yes;
945 rec_cfg.rec_en = regk_sser_yes;
946 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
947 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
948 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
949 port->started = 1;
950 }
951
952
953 /* Calculate number of available bytes */
954 /* Save pointers to avoid that they are modified by interrupt */
955 spin_lock_irqsave(&port->lock, flags);
956 start = (unsigned char*)port->readp; /* cast away volatile */
957 end = (unsigned char*)port->writep; /* cast away volatile */
958 spin_unlock_irqrestore(&port->lock, flags);
959 while ((start == end) && !port->full) /* No data */
960 {
961 if (file->f_flags & O_NONBLOCK)
962 {
963 return -EAGAIN;
964 }
965
966 interruptible_sleep_on(&port->in_wait_q);
967 if (signal_pending(current))
968 {
969 return -EINTR;
970 }
971 spin_lock_irqsave(&port->lock, flags);
972 start = (unsigned char*)port->readp; /* cast away volatile */
973 end = (unsigned char*)port->writep; /* cast away volatile */
974 spin_unlock_irqrestore(&port->lock, flags);
975 }
976
977 /* Lazy read, never return wrapped data. */
978 if (port->full)
979 avail = port->in_buffer_size;
980 else if (end > start)
981 avail = end - start;
982 else
983 avail = port->flip + port->in_buffer_size - start;
984
985 count = count > avail ? avail : count;
986 if (copy_to_user(buf, start, count))
987 return -EFAULT;
988 /* Disable interrupts while updating readp */
989 spin_lock_irqsave(&port->lock, flags);
990 port->readp += count;
991 if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
992 port->readp = port->flip;
993 port->full = 0;
994 spin_unlock_irqrestore(&port->lock, flags);
995 DEBUGREAD(printk("r %d\n", count));
996 return count;
997 }
998
999 static void send_word(sync_port* port)
1000 {
1001 reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
1002 reg_sser_rw_tr_data tr_data = {0};
1003
1004 switch(tr_cfg.sample_size)
1005 {
1006 case 8:
1007 port->out_count--;
1008 tr_data.data = *port->outp++;
1009 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1010 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1011 port->outp = port->out_buffer;
1012 break;
1013 case 12:
1014 {
1015 int data = (*port->outp++) << 8;
1016 data |= *port->outp++;
1017 port->out_count-=2;
1018 tr_data.data = data;
1019 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1020 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1021 port->outp = port->out_buffer;
1022 }
1023 break;
1024 case 16:
1025 port->out_count-=2;
1026 tr_data.data = *(unsigned short *)port->outp;
1027 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1028 port->outp+=2;
1029 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1030 port->outp = port->out_buffer;
1031 break;
1032 case 24:
1033 port->out_count-=3;
1034 tr_data.data = *(unsigned short *)port->outp;
1035 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1036 port->outp+=2;
1037 tr_data.data = *port->outp++;
1038 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1039 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1040 port->outp = port->out_buffer;
1041 break;
1042 case 32:
1043 port->out_count-=4;
1044 tr_data.data = *(unsigned short *)port->outp;
1045 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1046 port->outp+=2;
1047 tr_data.data = *(unsigned short *)port->outp;
1048 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1049 port->outp+=2;
1050 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1051 port->outp = port->out_buffer;
1052 break;
1053 }
1054 }
1055
1056
1057 static void start_dma(struct sync_port* port, const char* data, int count)
1058 {
1059 port->tr_running = 1;
1060 port->out_descr.buf = (char*)virt_to_phys((char*)data);
1061 port->out_descr.after = port->out_descr.buf + count;
1062 port->out_descr.eol = port->out_descr.intr = 1;
1063
1064 port->out_context.saved_data = (dma_descr_data*)virt_to_phys(&port->out_descr);
1065 port->out_context.saved_data_buf = port->out_descr.buf;
1066
1067 DMA_START_CONTEXT(port->regi_dmaout, virt_to_phys((char*)&port->out_context));
1068 DEBUGTXINT(printk("dma %08lX c %d\n", (unsigned long)data, count));
1069 }
1070
1071 static void start_dma_in(sync_port* port)
1072 {
1073 int i;
1074 char* buf;
1075 port->writep = port->flip;
1076
1077 if (port->writep > port->flip + port->in_buffer_size)
1078 {
1079 panic("Offset too large in sync serial driver\n");
1080 return;
1081 }
1082 buf = (char*)virt_to_phys(port->in_buffer);
1083 for (i = 0; i < NUM_IN_DESCR; i++) {
1084 port->in_descr[i].buf = buf;
1085 port->in_descr[i].after = buf + port->inbufchunk;
1086 port->in_descr[i].intr = 1;
1087 port->in_descr[i].next = (dma_descr_data*)virt_to_phys(&port->in_descr[i+1]);
1088 port->in_descr[i].buf = buf;
1089 buf += port->inbufchunk;
1090 }
1091 /* Link the last descriptor to the first */
1092 port->in_descr[i-1].next = (dma_descr_data*)virt_to_phys(&port->in_descr[0]);
1093 port->in_descr[i-1].eol = regk_sser_yes;
1094 port->next_rx_desc = &port->in_descr[0];
1095 port->prev_rx_desc = &port->in_descr[NUM_IN_DESCR - 1];
1096 port->in_context.saved_data = (dma_descr_data*)virt_to_phys(&port->in_descr[0]);
1097 port->in_context.saved_data_buf = port->in_descr[0].buf;
1098 DMA_START_CONTEXT(port->regi_dmain, virt_to_phys(&port->in_context));
1099 }
1100
1101 #ifdef SYNC_SER_DMA
1102 static irqreturn_t tr_interrupt(int irq, void *dev_id, struct pt_regs * regs)
1103 {
1104 reg_dma_r_masked_intr masked;
1105 reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes};
1106 int i;
1107 struct dma_descr_data *descr;
1108 unsigned int sentl;
1109 int found = 0;
1110
1111 for (i = 0; i < NUMBER_OF_PORTS; i++)
1112 {
1113 sync_port *port = &ports[i];
1114 if (!port->enabled || !port->use_dma )
1115 continue;
1116
1117 masked = REG_RD(dma, port->regi_dmaout, r_masked_intr);
1118
1119 if (masked.data) /* IRQ active for the port? */
1120 {
1121 found = 1;
1122 /* Clear IRQ */
1123 REG_WR(dma, port->regi_dmaout, rw_ack_intr, ack_intr);
1124 descr = &port->out_descr;
1125 sentl = descr->after - descr->buf;
1126 port->out_count -= sentl;
1127 port->outp += sentl;
1128 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1129 port->outp = port->out_buffer;
1130 if (port->out_count) {
1131 int c;
1132 c = port->out_buffer + OUT_BUFFER_SIZE - port->outp;
1133 if (c > port->out_count)
1134 c = port->out_count;
1135 DEBUGTXINT(printk("tx_int DMAWRITE %i %i\n", sentl, c));
1136 start_dma(port, port->outp, c);
1137 } else {
1138 DEBUGTXINT(printk("tx_int DMA stop %i\n", sentl));
1139 port->tr_running = 0;
1140 }
1141 wake_up_interruptible(&port->out_wait_q); /* wake up the waiting process */
1142 }
1143 }
1144 return IRQ_RETVAL(found);
1145 } /* tr_interrupt */
1146
1147 static irqreturn_t rx_interrupt(int irq, void *dev_id, struct pt_regs * regs)
1148 {
1149 reg_dma_r_masked_intr masked;
1150 reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes};
1151
1152 int i;
1153 int found = 0;
1154
1155 for (i = 0; i < NUMBER_OF_PORTS; i++)
1156 {
1157 sync_port *port = &ports[i];
1158
1159 if (!port->enabled || !port->use_dma )
1160 continue;
1161
1162 masked = REG_RD(dma, port->regi_dmain, r_masked_intr);
1163
1164 if (masked.data) /* Descriptor interrupt */
1165 {
1166 found = 1;
1167 while (REG_RD(dma, port->regi_dmain, rw_data) !=
1168 virt_to_phys(port->next_rx_desc)) {
1169
1170 if (port->writep + port->inbufchunk > port->flip + port->in_buffer_size) {
1171 int first_size = port->flip + port->in_buffer_size - port->writep;
1172 memcpy((char*)port->writep, phys_to_virt((unsigned)port->next_rx_desc->buf), first_size);
1173 memcpy(port->flip, phys_to_virt((unsigned)port->next_rx_desc->buf+first_size), port->inbufchunk - first_size);
1174 port->writep = port->flip + port->inbufchunk - first_size;
1175 } else {
1176 memcpy((char*)port->writep,
1177 phys_to_virt((unsigned)port->next_rx_desc->buf),
1178 port->inbufchunk);
1179 port->writep += port->inbufchunk;
1180 if (port->writep >= port->flip + port->in_buffer_size)
1181 port->writep = port->flip;
1182 }
1183 if (port->writep == port->readp)
1184 {
1185 port->full = 1;
1186 }
1187
1188 port->next_rx_desc->eol = 0;
1189 port->prev_rx_desc->eol = 1;
1190 port->prev_rx_desc = phys_to_virt((unsigned)port->next_rx_desc);
1191 port->next_rx_desc = phys_to_virt((unsigned)port->next_rx_desc->next);
1192 wake_up_interruptible(&port->in_wait_q); /* wake up the waiting process */
1193 DMA_CONTINUE(port->regi_dmain);
1194 REG_WR(dma, port->regi_dmain, rw_ack_intr, ack_intr);
1195
1196 }
1197 }
1198 }
1199 return IRQ_RETVAL(found);
1200 } /* rx_interrupt */
1201 #endif /* SYNC_SER_DMA */
1202
1203 #ifdef SYNC_SER_MANUAL
1204 static irqreturn_t manual_interrupt(int irq, void *dev_id, struct pt_regs * regs)
1205 {
1206 int i;
1207 int found = 0;
1208 reg_sser_r_masked_intr masked;
1209
1210 for (i = 0; i < NUMBER_OF_PORTS; i++)
1211 {
1212 sync_port* port = &ports[i];
1213
1214 if (!port->enabled || port->use_dma)
1215 {
1216 continue;
1217 }
1218
1219 masked = REG_RD(sser, port->regi_sser, r_masked_intr);
1220 if (masked.rdav) /* Data received? */
1221 {
1222 reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
1223 reg_sser_r_rec_data data = REG_RD(sser, port->regi_sser, r_rec_data);
1224 found = 1;
1225 /* Read data */
1226 switch(rec_cfg.sample_size)
1227 {
1228 case 8:
1229 *port->writep++ = data.data & 0xff;
1230 break;
1231 case 12:
1232 *port->writep = (data.data & 0x0ff0) >> 4;
1233 *(port->writep + 1) = data.data & 0x0f;
1234 port->writep+=2;
1235 break;
1236 case 16:
1237 *(unsigned short*)port->writep = data.data;
1238 port->writep+=2;
1239 break;
1240 case 24:
1241 *(unsigned int*)port->writep = data.data;
1242 port->writep+=3;
1243 break;
1244 case 32:
1245 *(unsigned int*)port->writep = data.data;
1246 port->writep+=4;
1247 break;
1248 }
1249
1250 if (port->writep >= port->flip + port->in_buffer_size) /* Wrap? */
1251 port->writep = port->flip;
1252 if (port->writep == port->readp) {
1253 /* receive buffer overrun, discard oldest data
1254 */
1255 port->readp++;
1256 if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
1257 port->readp = port->flip;
1258 }
1259 if (sync_data_avail(port) >= port->inbufchunk)
1260 wake_up_interruptible(&port->in_wait_q); /* Wake up application */
1261 }
1262
1263 if (masked.trdy) /* Transmitter ready? */
1264 {
1265 found = 1;
1266 if (port->out_count > 0) /* More data to send */
1267 send_word(port);
1268 else /* transmission finished */
1269 {
1270 reg_sser_rw_intr_mask intr_mask;
1271 intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
1272 intr_mask.trdy = 0;
1273 REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
1274 wake_up_interruptible(&port->out_wait_q); /* Wake up application */
1275 }
1276 }
1277 }
1278 return IRQ_RETVAL(found);
1279 }
1280 #endif
1281
1282 module_init(etrax_sync_serial_init);
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