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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / arch / cris / arch-v10 / drivers / sync_serial.c
blob069546e342c55fca11432fdc660ae99ffc6d7668
1 /*
2 * Simple synchronous serial port driver for ETRAX 100LX.
3 *
4 * Synchronous serial ports are used for continuous streamed data like audio.
5 * The default setting for this driver is compatible with the STA 013 MP3
6 * decoder. The driver can easily be tuned to fit other audio encoder/decoders
7 * and SPI
8 *
9 * Copyright (c) 2001-2008 Axis Communications AB
10 *
11 * Author: Mikael Starvik, Johan Adolfsson
12 *
13 */
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/errno.h>
18 #include <linux/major.h>
19 #include <linux/sched.h>
20 #include <linux/slab.h>
21 #include <linux/interrupt.h>
22 #include <linux/poll.h>
23 #include <linux/init.h>
24 #include <linux/timer.h>
25 #include <asm/irq.h>
26 #include <asm/dma.h>
27 #include <asm/io.h>
28 #include <asm/arch/svinto.h>
29 #include <asm/uaccess.h>
30 #include <asm/system.h>
31 #include <asm/sync_serial.h>
32 #include <asm/arch/io_interface_mux.h>
33
34 /* The receiver is a bit tricky beacuse of the continuous stream of data.*/
35 /* */
36 /* Three DMA descriptors are linked together. Each DMA descriptor is */
37 /* responsible for port->bufchunk of a common buffer. */
38 /* */
39 /* +---------------------------------------------+ */
40 /* | +----------+ +----------+ +----------+ | */
41 /* +-> | Descr[0] |-->| Descr[1] |-->| Descr[2] |-+ */
42 /* +----------+ +----------+ +----------+ */
43 /* | | | */
44 /* v v v */
45 /* +-------------------------------------+ */
46 /* | BUFFER | */
47 /* +-------------------------------------+ */
48 /* |<- data_avail ->| */
49 /* readp writep */
50 /* */
51 /* If the application keeps up the pace readp will be right after writep.*/
52 /* If the application can't keep the pace we have to throw away data. */
53 /* The idea is that readp should be ready with the data pointed out by */
54 /* Descr[i] when the DMA has filled in Descr[i+1]. */
55 /* Otherwise we will discard */
56 /* the rest of the data pointed out by Descr1 and set readp to the start */
57 /* of Descr2 */
58
59 #define SYNC_SERIAL_MAJOR 125
60
61 /* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */
62 /* words can be handled */
63 #define IN_BUFFER_SIZE 12288
64 #define IN_DESCR_SIZE 256
65 #define NUM_IN_DESCR (IN_BUFFER_SIZE/IN_DESCR_SIZE)
66 #define OUT_BUFFER_SIZE 4096
67
68 #define DEFAULT_FRAME_RATE 0
69 #define DEFAULT_WORD_RATE 7
70
71 /* NOTE: Enabling some debug will likely cause overrun or underrun,
72 * especially if manual mode is use.
73 */
74 #define DEBUG(x)
75 #define DEBUGREAD(x)
76 #define DEBUGWRITE(x)
77 #define DEBUGPOLL(x)
78 #define DEBUGRXINT(x)
79 #define DEBUGTXINT(x)
80
81 /* Define some macros to access ETRAX 100 registers */
82 #define SETF(var, reg, field, val) \
83 do { \
84 var = (var & ~IO_MASK_(reg##_, field##_)) | \
85 IO_FIELD_(reg##_, field##_, val); \
86 } while (0)
87
88 #define SETS(var, reg, field, val) \
89 do { \
90 var = (var & ~IO_MASK_(reg##_, field##_)) | \
91 IO_STATE_(reg##_, field##_, _##val); \
92 } while (0)
93
94 struct sync_port {
95 /* Etrax registers and bits*/
96 const volatile unsigned *const status;
97 volatile unsigned *const ctrl_data;
98 volatile unsigned *const output_dma_first;
99 volatile unsigned char *const output_dma_cmd;
100 volatile unsigned char *const output_dma_clr_irq;
101 volatile unsigned *const input_dma_first;
102 volatile unsigned char *const input_dma_cmd;
103 volatile unsigned *const input_dma_descr;
104 /* 8*4 */
105 volatile unsigned char *const input_dma_clr_irq;
106 volatile unsigned *const data_out;
107 const volatile unsigned *const data_in;
108 char data_avail_bit; /* In R_IRQ_MASK1_RD/SET/CLR */
109 char transmitter_ready_bit; /* In R_IRQ_MASK1_RD/SET/CLR */
110 char input_dma_descr_bit; /* In R_IRQ_MASK2_RD */
111
112 char output_dma_bit; /* In R_IRQ_MASK2_RD */
113 /* End of fields initialised in array */
114 char started; /* 1 if port has been started */
115 char port_nbr; /* Port 0 or 1 */
116 char busy; /* 1 if port is busy */
117
118 char enabled; /* 1 if port is enabled */
119 char use_dma; /* 1 if port uses dma */
120 char tr_running;
121
122 char init_irqs;
123
124 /* Register shadow */
125 unsigned int ctrl_data_shadow;
126 /* Remaining bytes for current transfer */
127 volatile unsigned int out_count;
128 /* Current position in out_buffer */
129 unsigned char *outp;
130 /* 16*4 */
131 /* Next byte to be read by application */
132 volatile unsigned char *volatile readp;
133 /* Next byte to be written by etrax */
134 volatile unsigned char *volatile writep;
135
136 unsigned int in_buffer_size;
137 unsigned int inbufchunk;
138 struct etrax_dma_descr out_descr __attribute__ ((aligned(32)));
139 struct etrax_dma_descr in_descr[NUM_IN_DESCR] __attribute__ ((aligned(32)));
140 unsigned char out_buffer[OUT_BUFFER_SIZE] __attribute__ ((aligned(32)));
141 unsigned char in_buffer[IN_BUFFER_SIZE]__attribute__ ((aligned(32)));
142 unsigned char flip[IN_BUFFER_SIZE] __attribute__ ((aligned(32)));
143 struct etrax_dma_descr *next_rx_desc;
144 struct etrax_dma_descr *prev_rx_desc;
145 int full;
146
147 wait_queue_head_t out_wait_q;
148 wait_queue_head_t in_wait_q;
149 };
150
151
152 static int etrax_sync_serial_init(void);
153 static void initialize_port(int portnbr);
154 static inline int sync_data_avail(struct sync_port *port);
155
156 static int sync_serial_open(struct inode *inode, struct file *file);
157 static int sync_serial_release(struct inode *inode, struct file *file);
158 static unsigned int sync_serial_poll(struct file *filp, poll_table *wait);
159
160 static int sync_serial_ioctl(struct inode *inode, struct file *file,
161 unsigned int cmd, unsigned long arg);
162 static ssize_t sync_serial_write(struct file *file, const char *buf,
163 size_t count, loff_t *ppos);
164 static ssize_t sync_serial_read(struct file *file, char *buf,
165 size_t count, loff_t *ppos);
166
167 #if ((defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
168 defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
169 (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
170 defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)))
171 #define SYNC_SER_DMA
172 #endif
173
174 static void send_word(struct sync_port *port);
175 static void start_dma(struct sync_port *port, const char *data, int count);
176 static void start_dma_in(struct sync_port *port);
177 #ifdef SYNC_SER_DMA
178 static irqreturn_t tr_interrupt(int irq, void *dev_id);
179 static irqreturn_t rx_interrupt(int irq, void *dev_id);
180 #endif
181 #if ((defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
182 !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
183 (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
184 !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)))
185 #define SYNC_SER_MANUAL
186 #endif
187 #ifdef SYNC_SER_MANUAL
188 static irqreturn_t manual_interrupt(int irq, void *dev_id);
189 #endif
190
191 /* The ports */
192 static struct sync_port ports[] = {
193 {
194 .status = R_SYNC_SERIAL1_STATUS,
195 .ctrl_data = R_SYNC_SERIAL1_CTRL,
196 .output_dma_first = R_DMA_CH8_FIRST,
197 .output_dma_cmd = R_DMA_CH8_CMD,
198 .output_dma_clr_irq = R_DMA_CH8_CLR_INTR,
199 .input_dma_first = R_DMA_CH9_FIRST,
200 .input_dma_cmd = R_DMA_CH9_CMD,
201 .input_dma_descr = R_DMA_CH9_DESCR,
202 .input_dma_clr_irq = R_DMA_CH9_CLR_INTR,
203 .data_out = R_SYNC_SERIAL1_TR_DATA,
204 .data_in = R_SYNC_SERIAL1_REC_DATA,
205 .data_avail_bit = IO_BITNR(R_IRQ_MASK1_RD, ser1_data),
206 .transmitter_ready_bit = IO_BITNR(R_IRQ_MASK1_RD, ser1_ready),
207 .input_dma_descr_bit = IO_BITNR(R_IRQ_MASK2_RD, dma9_descr),
208 .output_dma_bit = IO_BITNR(R_IRQ_MASK2_RD, dma8_eop),
209 .init_irqs = 1,
210 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)
211 .use_dma = 1,
212 #else
213 .use_dma = 0,
214 #endif
215 },
216 {
217 .status = R_SYNC_SERIAL3_STATUS,
218 .ctrl_data = R_SYNC_SERIAL3_CTRL,
219 .output_dma_first = R_DMA_CH4_FIRST,
220 .output_dma_cmd = R_DMA_CH4_CMD,
221 .output_dma_clr_irq = R_DMA_CH4_CLR_INTR,
222 .input_dma_first = R_DMA_CH5_FIRST,
223 .input_dma_cmd = R_DMA_CH5_CMD,
224 .input_dma_descr = R_DMA_CH5_DESCR,
225 .input_dma_clr_irq = R_DMA_CH5_CLR_INTR,
226 .data_out = R_SYNC_SERIAL3_TR_DATA,
227 .data_in = R_SYNC_SERIAL3_REC_DATA,
228 .data_avail_bit = IO_BITNR(R_IRQ_MASK1_RD, ser3_data),
229 .transmitter_ready_bit = IO_BITNR(R_IRQ_MASK1_RD, ser3_ready),
230 .input_dma_descr_bit = IO_BITNR(R_IRQ_MASK2_RD, dma5_descr),
231 .output_dma_bit = IO_BITNR(R_IRQ_MASK2_RD, dma4_eop),
232 .init_irqs = 1,
233 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)
234 .use_dma = 1,
235 #else
236 .use_dma = 0,
237 #endif
238 }
239 };
240
241 /* Register shadows */
242 static unsigned sync_serial_prescale_shadow;
243
244 #define NUMBER_OF_PORTS 2
245
246 static struct file_operations sync_serial_fops = {
247 .owner = THIS_MODULE,
248 .write = sync_serial_write,
249 .read = sync_serial_read,
250 .poll = sync_serial_poll,
251 .ioctl = sync_serial_ioctl,
252 .open = sync_serial_open,
253 .release = sync_serial_release
254 };
255
256 static int __init etrax_sync_serial_init(void)
257 {
258 ports[0].enabled = 0;
259 ports[1].enabled = 0;
260
261 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
262 if (cris_request_io_interface(if_sync_serial_1, "sync_ser1")) {
263 printk(KERN_CRIT "ETRAX100LX sync_serial: "
264 "Could not allocate IO group for port %d\n", 0);
265 return -EBUSY;
266 }
267 #endif
268 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
269 if (cris_request_io_interface(if_sync_serial_3, "sync_ser3")) {
270 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
271 cris_free_io_interface(if_sync_serial_1);
272 #endif
273 printk(KERN_CRIT "ETRAX100LX sync_serial: "
274 "Could not allocate IO group for port %d\n", 1);
275 return -EBUSY;
276 }
277 #endif
278
279 if (register_chrdev(SYNC_SERIAL_MAJOR, "sync serial",
280 &sync_serial_fops) < 0) {
281 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
282 cris_free_io_interface(if_sync_serial_3);
283 #endif
284 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
285 cris_free_io_interface(if_sync_serial_1);
286 #endif
287 printk("unable to get major for synchronous serial port\n");
288 return -EBUSY;
289 }
290
291 /* Deselect synchronous serial ports while configuring. */
292 SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, async);
293 SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, async);
294 *R_GEN_CONFIG_II = gen_config_ii_shadow;
295
296 /* Initialize Ports */
297 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
298 ports[0].enabled = 1;
299 SETS(port_pb_i2c_shadow, R_PORT_PB_I2C, syncser1, ss1extra);
300 SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, sync);
301 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)
302 ports[0].use_dma = 1;
303 #else
304 ports[0].use_dma = 0;
305 #endif
306 initialize_port(0);
307 #endif
308
309 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
310 ports[1].enabled = 1;
311 SETS(port_pb_i2c_shadow, R_PORT_PB_I2C, syncser3, ss3extra);
312 SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, sync);
313 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)
314 ports[1].use_dma = 1;
315 #else
316 ports[1].use_dma = 0;
317 #endif
318 initialize_port(1);
319 #endif
320
321 *R_PORT_PB_I2C = port_pb_i2c_shadow; /* Use PB4/PB7 */
322
323 /* Set up timing */
324 *R_SYNC_SERIAL_PRESCALE = sync_serial_prescale_shadow = (
325 IO_STATE(R_SYNC_SERIAL_PRESCALE, clk_sel_u1, codec) |
326 IO_STATE(R_SYNC_SERIAL_PRESCALE, word_stb_sel_u1, external) |
327 IO_STATE(R_SYNC_SERIAL_PRESCALE, clk_sel_u3, codec) |
328 IO_STATE(R_SYNC_SERIAL_PRESCALE, word_stb_sel_u3, external) |
329 IO_STATE(R_SYNC_SERIAL_PRESCALE, prescaler, div4) |
330 IO_FIELD(R_SYNC_SERIAL_PRESCALE, frame_rate,
331 DEFAULT_FRAME_RATE) |
332 IO_FIELD(R_SYNC_SERIAL_PRESCALE, word_rate, DEFAULT_WORD_RATE) |
333 IO_STATE(R_SYNC_SERIAL_PRESCALE, warp_mode, normal));
334
335 /* Select synchronous ports */
336 *R_GEN_CONFIG_II = gen_config_ii_shadow;
337
338 printk(KERN_INFO "ETRAX 100LX synchronous serial port driver\n");
339 return 0;
340 }
341
342 static void __init initialize_port(int portnbr)
343 {
344 struct sync_port *port = &ports[portnbr];
345
346 DEBUG(printk(KERN_DEBUG "Init sync serial port %d\n", portnbr));
347
348 port->started = 0;
349 port->port_nbr = portnbr;
350 port->busy = 0;
351 port->tr_running = 0;
352
353 port->out_count = 0;
354 port->outp = port->out_buffer;
355
356 port->readp = port->flip;
357 port->writep = port->flip;
358 port->in_buffer_size = IN_BUFFER_SIZE;
359 port->inbufchunk = IN_DESCR_SIZE;
360 port->next_rx_desc = &port->in_descr[0];
361 port->prev_rx_desc = &port->in_descr[NUM_IN_DESCR-1];
362 port->prev_rx_desc->ctrl = d_eol;
363
364 init_waitqueue_head(&port->out_wait_q);
365 init_waitqueue_head(&port->in_wait_q);
366
367 port->ctrl_data_shadow =
368 IO_STATE(R_SYNC_SERIAL1_CTRL, tr_baud, c115k2Hz) |
369 IO_STATE(R_SYNC_SERIAL1_CTRL, mode, master_output) |
370 IO_STATE(R_SYNC_SERIAL1_CTRL, error, ignore) |
371 IO_STATE(R_SYNC_SERIAL1_CTRL, rec_enable, disable) |
372 IO_STATE(R_SYNC_SERIAL1_CTRL, f_synctype, normal) |
373 IO_STATE(R_SYNC_SERIAL1_CTRL, f_syncsize, word) |
374 IO_STATE(R_SYNC_SERIAL1_CTRL, f_sync, on) |
375 IO_STATE(R_SYNC_SERIAL1_CTRL, clk_mode, normal) |
376 IO_STATE(R_SYNC_SERIAL1_CTRL, clk_halt, stopped) |
377 IO_STATE(R_SYNC_SERIAL1_CTRL, bitorder, msb) |
378 IO_STATE(R_SYNC_SERIAL1_CTRL, tr_enable, disable) |
379 IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size8bit) |
380 IO_STATE(R_SYNC_SERIAL1_CTRL, buf_empty, lmt_8) |
381 IO_STATE(R_SYNC_SERIAL1_CTRL, buf_full, lmt_8) |
382 IO_STATE(R_SYNC_SERIAL1_CTRL, flow_ctrl, enabled) |
383 IO_STATE(R_SYNC_SERIAL1_CTRL, clk_polarity, neg) |
384 IO_STATE(R_SYNC_SERIAL1_CTRL, frame_polarity, normal)|
385 IO_STATE(R_SYNC_SERIAL1_CTRL, status_polarity, inverted)|
386 IO_STATE(R_SYNC_SERIAL1_CTRL, clk_driver, normal) |
387 IO_STATE(R_SYNC_SERIAL1_CTRL, frame_driver, normal) |
388 IO_STATE(R_SYNC_SERIAL1_CTRL, status_driver, normal)|
389 IO_STATE(R_SYNC_SERIAL1_CTRL, def_out0, high);
390
391 if (port->use_dma)
392 port->ctrl_data_shadow |= IO_STATE(R_SYNC_SERIAL1_CTRL,
393 dma_enable, on);
394 else
395 port->ctrl_data_shadow |= IO_STATE(R_SYNC_SERIAL1_CTRL,
396 dma_enable, off);
397
398 *port->ctrl_data = port->ctrl_data_shadow;
399 }
400
401 static inline int sync_data_avail(struct sync_port *port)
402 {
403 int avail;
404 unsigned char *start;
405 unsigned char *end;
406
407 start = (unsigned char *)port->readp; /* cast away volatile */
408 end = (unsigned char *)port->writep; /* cast away volatile */
409 /* 0123456789 0123456789
410 * ----- - -----
411 * ^rp ^wp ^wp ^rp
412 */
413 if (end >= start)
414 avail = end - start;
415 else
416 avail = port->in_buffer_size - (start - end);
417 return avail;
418 }
419
420 static inline int sync_data_avail_to_end(struct sync_port *port)
421 {
422 int avail;
423 unsigned char *start;
424 unsigned char *end;
425
426 start = (unsigned char *)port->readp; /* cast away volatile */
427 end = (unsigned char *)port->writep; /* cast away volatile */
428 /* 0123456789 0123456789
429 * ----- -----
430 * ^rp ^wp ^wp ^rp
431 */
432
433 if (end >= start)
434 avail = end - start;
435 else
436 avail = port->flip + port->in_buffer_size - start;
437 return avail;
438 }
439
440
441 static int sync_serial_open(struct inode *inode, struct file *file)
442 {
443 int dev = MINOR(inode->i_rdev);
444 struct sync_port *port;
445 int mode;
446
447 DEBUG(printk(KERN_DEBUG "Open sync serial port %d\n", dev));
448
449 if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) {
450 DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
451 return -ENODEV;
452 }
453 port = &ports[dev];
454 /* Allow open this device twice (assuming one reader and one writer) */
455 if (port->busy == 2) {
456 DEBUG(printk(KERN_DEBUG "Device is busy.. \n"));
457 return -EBUSY;
458 }
459 if (port->init_irqs) {
460 if (port->use_dma) {
461 if (port == &ports[0]) {
462 #ifdef SYNC_SER_DMA
463 if (request_irq(24, tr_interrupt, 0,
464 "synchronous serial 1 dma tr",
465 &ports[0])) {
466 printk(KERN_CRIT "Can't alloc "
467 "sync serial port 1 IRQ");
468 return -EBUSY;
469 } else if (request_irq(25, rx_interrupt, 0,
470 "synchronous serial 1 dma rx",
471 &ports[0])) {
472 free_irq(24, &port[0]);
473 printk(KERN_CRIT "Can't alloc "
474 "sync serial port 1 IRQ");
475 return -EBUSY;
476 } else if (cris_request_dma(8,
477 "synchronous serial 1 dma tr",
478 DMA_VERBOSE_ON_ERROR,
479 dma_ser1)) {
480 free_irq(24, &port[0]);
481 free_irq(25, &port[0]);
482 printk(KERN_CRIT "Can't alloc "
483 "sync serial port 1 "
484 "TX DMA channel");
485 return -EBUSY;
486 } else if (cris_request_dma(9,
487 "synchronous serial 1 dma rec",
488 DMA_VERBOSE_ON_ERROR,
489 dma_ser1)) {
490 cris_free_dma(8, NULL);
491 free_irq(24, &port[0]);
492 free_irq(25, &port[0]);
493 printk(KERN_CRIT "Can't alloc "
494 "sync serial port 1 "
495 "RX DMA channel");
496 return -EBUSY;
497 }
498 #endif
499 RESET_DMA(8); WAIT_DMA(8);
500 RESET_DMA(9); WAIT_DMA(9);
501 *R_DMA_CH8_CLR_INTR =
502 IO_STATE(R_DMA_CH8_CLR_INTR, clr_eop,
503 do) |
504 IO_STATE(R_DMA_CH8_CLR_INTR, clr_descr,
505 do);
506 *R_DMA_CH9_CLR_INTR =
507 IO_STATE(R_DMA_CH9_CLR_INTR, clr_eop,
508 do) |
509 IO_STATE(R_DMA_CH9_CLR_INTR, clr_descr,
510 do);
511 *R_IRQ_MASK2_SET =
512 IO_STATE(R_IRQ_MASK2_SET, dma8_eop,
513 set) |
514 IO_STATE(R_IRQ_MASK2_SET, dma9_descr,
515 set);
516 } else if (port == &ports[1]) {
517 #ifdef SYNC_SER_DMA
518 if (request_irq(20, tr_interrupt, 0,
519 "synchronous serial 3 dma tr",
520 &ports[1])) {
521 printk(KERN_CRIT "Can't alloc "
522 "sync serial port 3 IRQ");
523 return -EBUSY;
524 } else if (request_irq(21, rx_interrupt, 0,
525 "synchronous serial 3 dma rx",
526 &ports[1])) {
527 free_irq(20, &ports[1]);
528 printk(KERN_CRIT "Can't alloc "
529 "sync serial port 3 IRQ");
530 return -EBUSY;
531 } else if (cris_request_dma(4,
532 "synchronous serial 3 dma tr",
533 DMA_VERBOSE_ON_ERROR,
534 dma_ser3)) {
535 free_irq(21, &ports[1]);
536 free_irq(20, &ports[1]);
537 printk(KERN_CRIT "Can't alloc "
538 "sync serial port 3 "
539 "TX DMA channel");
540 return -EBUSY;
541 } else if (cris_request_dma(5,
542 "synchronous serial 3 dma rec",
543 DMA_VERBOSE_ON_ERROR,
544 dma_ser3)) {
545 cris_free_dma(4, NULL);
546 free_irq(21, &ports[1]);
547 free_irq(20, &ports[1]);
548 printk(KERN_CRIT "Can't alloc "
549 "sync serial port 3 "
550 "RX DMA channel");
551 return -EBUSY;
552 }
553 #endif
554 RESET_DMA(4); WAIT_DMA(4);
555 RESET_DMA(5); WAIT_DMA(5);
556 *R_DMA_CH4_CLR_INTR =
557 IO_STATE(R_DMA_CH4_CLR_INTR, clr_eop,
558 do) |
559 IO_STATE(R_DMA_CH4_CLR_INTR, clr_descr,
560 do);
561 *R_DMA_CH5_CLR_INTR =
562 IO_STATE(R_DMA_CH5_CLR_INTR, clr_eop,
563 do) |
564 IO_STATE(R_DMA_CH5_CLR_INTR, clr_descr,
565 do);
566 *R_IRQ_MASK2_SET =
567 IO_STATE(R_IRQ_MASK2_SET, dma4_eop,
568 set) |
569 IO_STATE(R_IRQ_MASK2_SET, dma5_descr,
570 set);
571 }
572 start_dma_in(port);
573 port->init_irqs = 0;
574 } else { /* !port->use_dma */
575 #ifdef SYNC_SER_MANUAL
576 if (port == &ports[0]) {
577 if (request_irq(8,
578 manual_interrupt,
579 IRQF_SHARED | IRQF_DISABLED,
580 "synchronous serial manual irq",
581 &ports[0])) {
582 printk(KERN_CRIT "Can't alloc "
583 "sync serial manual irq");
584 return -EBUSY;
585 }
586 } else if (port == &ports[1]) {
587 if (request_irq(8,
588 manual_interrupt,
589 IRQF_SHARED | IRQF_DISABLED,
590 "synchronous serial manual irq",
591 &ports[1])) {
592 printk(KERN_CRIT "Can't alloc "
593 "sync serial manual irq");
594 return -EBUSY;
595 }
596 }
597 port->init_irqs = 0;
598 #else
599 panic("sync_serial: Manual mode not supported.\n");
600 #endif /* SYNC_SER_MANUAL */
601 }
602 } /* port->init_irqs */
603
604 port->busy++;
605 /* Start port if we use it as input */
606 mode = IO_EXTRACT(R_SYNC_SERIAL1_CTRL, mode, port->ctrl_data_shadow);
607 if (mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, master_input) ||
608 mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, slave_input) ||
609 mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, master_bidir) ||
610 mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, slave_bidir)) {
611 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, clk_halt,
612 running);
613 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, tr_enable,
614 enable);
615 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, rec_enable,
616 enable);
617 port->started = 1;
618 *port->ctrl_data = port->ctrl_data_shadow;
619 if (!port->use_dma)
620 *R_IRQ_MASK1_SET = 1 << port->data_avail_bit;
621 DEBUG(printk(KERN_DEBUG "sser%d rec started\n", dev));
622 }
623 return 0;
624 }
625
626 static int sync_serial_release(struct inode *inode, struct file *file)
627 {
628 int dev = MINOR(inode->i_rdev);
629 struct sync_port *port;
630
631 if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) {
632 DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
633 return -ENODEV;
634 }
635 port = &ports[dev];
636 if (port->busy)
637 port->busy--;
638 if (!port->busy)
639 *R_IRQ_MASK1_CLR = ((1 << port->data_avail_bit) |
640 (1 << port->transmitter_ready_bit));
641
642 return 0;
643 }
644
645
646
647 static unsigned int sync_serial_poll(struct file *file, poll_table *wait)
648 {
649 int dev = MINOR(file->f_dentry->d_inode->i_rdev);
650 unsigned int mask = 0;
651 struct sync_port *port;
652 DEBUGPOLL(static unsigned int prev_mask = 0);
653
654 port = &ports[dev];
655 poll_wait(file, &port->out_wait_q, wait);
656 poll_wait(file, &port->in_wait_q, wait);
657 /* Some room to write */
658 if (port->out_count < OUT_BUFFER_SIZE)
659 mask |= POLLOUT | POLLWRNORM;
660 /* At least an inbufchunk of data */
661 if (sync_data_avail(port) >= port->inbufchunk)
662 mask |= POLLIN | POLLRDNORM;
663
664 DEBUGPOLL(if (mask != prev_mask)
665 printk(KERN_DEBUG "sync_serial_poll: mask 0x%08X %s %s\n",
666 mask,
667 mask & POLLOUT ? "POLLOUT" : "",
668 mask & POLLIN ? "POLLIN" : "");
669 prev_mask = mask;
670 );
671 return mask;
672 }
673
674 static int sync_serial_ioctl(struct inode *inode, struct file *file,
675 unsigned int cmd, unsigned long arg)
676 {
677 int return_val = 0;
678 unsigned long flags;
679
680 int dev = MINOR(file->f_dentry->d_inode->i_rdev);
681 struct sync_port *port;
682
683 if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) {
684 DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
685 return -1;
686 }
687 port = &ports[dev];
688
689 local_irq_save(flags);
690 /* Disable port while changing config */
691 if (dev) {
692 if (port->use_dma) {
693 RESET_DMA(4); WAIT_DMA(4);
694 port->tr_running = 0;
695 port->out_count = 0;
696 port->outp = port->out_buffer;
697 *R_DMA_CH4_CLR_INTR =
698 IO_STATE(R_DMA_CH4_CLR_INTR, clr_eop, do) |
699 IO_STATE(R_DMA_CH4_CLR_INTR, clr_descr, do);
700 }
701 SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, async);
702 } else {
703 if (port->use_dma) {
704 RESET_DMA(8); WAIT_DMA(8);
705 port->tr_running = 0;
706 port->out_count = 0;
707 port->outp = port->out_buffer;
708 *R_DMA_CH8_CLR_INTR =
709 IO_STATE(R_DMA_CH8_CLR_INTR, clr_eop, do) |
710 IO_STATE(R_DMA_CH8_CLR_INTR, clr_descr, do);
711 }
712 SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, async);
713 }
714 *R_GEN_CONFIG_II = gen_config_ii_shadow;
715 local_irq_restore(flags);
716
717 switch (cmd) {
718 case SSP_SPEED:
719 if (GET_SPEED(arg) == CODEC) {
720 if (dev)
721 SETS(sync_serial_prescale_shadow,
722 R_SYNC_SERIAL_PRESCALE, clk_sel_u3,
723 codec);
724 else
725 SETS(sync_serial_prescale_shadow,
726 R_SYNC_SERIAL_PRESCALE, clk_sel_u1,
727 codec);
728
729 SETF(sync_serial_prescale_shadow,
730 R_SYNC_SERIAL_PRESCALE, prescaler,
731 GET_FREQ(arg));
732 SETF(sync_serial_prescale_shadow,
733 R_SYNC_SERIAL_PRESCALE, frame_rate,
734 GET_FRAME_RATE(arg));
735 SETF(sync_serial_prescale_shadow,
736 R_SYNC_SERIAL_PRESCALE, word_rate,
737 GET_WORD_RATE(arg));
738 } else {
739 SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
740 tr_baud, GET_SPEED(arg));
741 if (dev)
742 SETS(sync_serial_prescale_shadow,
743 R_SYNC_SERIAL_PRESCALE, clk_sel_u3,
744 baudrate);
745 else
746 SETS(sync_serial_prescale_shadow,
747 R_SYNC_SERIAL_PRESCALE, clk_sel_u1,
748 baudrate);
749 }
750 break;
751 case SSP_MODE:
752 if (arg > 5)
753 return -EINVAL;
754 if (arg == MASTER_OUTPUT || arg == SLAVE_OUTPUT)
755 *R_IRQ_MASK1_CLR = 1 << port->data_avail_bit;
756 else if (!port->use_dma)
757 *R_IRQ_MASK1_SET = 1 << port->data_avail_bit;
758 SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, mode, arg);
759 break;
760 case SSP_FRAME_SYNC:
761 if (arg & NORMAL_SYNC)
762 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
763 f_synctype, normal);
764 else if (arg & EARLY_SYNC)
765 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
766 f_synctype, early);
767
768 if (arg & BIT_SYNC)
769 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
770 f_syncsize, bit);
771 else if (arg & WORD_SYNC)
772 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
773 f_syncsize, word);
774 else if (arg & EXTENDED_SYNC)
775 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
776 f_syncsize, extended);
777
778 if (arg & SYNC_ON)
779 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
780 f_sync, on);
781 else if (arg & SYNC_OFF)
782 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
783 f_sync, off);
784
785 if (arg & WORD_SIZE_8)
786 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
787 wordsize, size8bit);
788 else if (arg & WORD_SIZE_12)
789 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
790 wordsize, size12bit);
791 else if (arg & WORD_SIZE_16)
792 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
793 wordsize, size16bit);
794 else if (arg & WORD_SIZE_24)
795 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
796 wordsize, size24bit);
797 else if (arg & WORD_SIZE_32)
798 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
799 wordsize, size32bit);
800
801 if (arg & BIT_ORDER_MSB)
802 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
803 bitorder, msb);
804 else if (arg & BIT_ORDER_LSB)
805 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
806 bitorder, lsb);
807
808 if (arg & FLOW_CONTROL_ENABLE)
809 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
810 flow_ctrl, enabled);
811 else if (arg & FLOW_CONTROL_DISABLE)
812 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
813 flow_ctrl, disabled);
814
815 if (arg & CLOCK_NOT_GATED)
816 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
817 clk_mode, normal);
818 else if (arg & CLOCK_GATED)
819 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
820 clk_mode, gated);
821
822 break;
823 case SSP_IPOLARITY:
824 /* NOTE!! negedge is considered NORMAL */
825 if (arg & CLOCK_NORMAL)
826 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
827 clk_polarity, neg);
828 else if (arg & CLOCK_INVERT)
829 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
830 clk_polarity, pos);
831
832 if (arg & FRAME_NORMAL)
833 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
834 frame_polarity, normal);
835 else if (arg & FRAME_INVERT)
836 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
837 frame_polarity, inverted);
838
839 if (arg & STATUS_NORMAL)
840 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
841 status_polarity, normal);
842 else if (arg & STATUS_INVERT)
843 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
844 status_polarity, inverted);
845 break;
846 case SSP_OPOLARITY:
847 if (arg & CLOCK_NORMAL)
848 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
849 clk_driver, normal);
850 else if (arg & CLOCK_INVERT)
851 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
852 clk_driver, inverted);
853
854 if (arg & FRAME_NORMAL)
855 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
856 frame_driver, normal);
857 else if (arg & FRAME_INVERT)
858 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
859 frame_driver, inverted);
860
861 if (arg & STATUS_NORMAL)
862 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
863 status_driver, normal);
864 else if (arg & STATUS_INVERT)
865 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
866 status_driver, inverted);
867 break;
868 case SSP_SPI:
869 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, flow_ctrl,
870 disabled);
871 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, bitorder,
872 msb);
873 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, wordsize,
874 size8bit);
875 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, f_sync, on);
876 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, f_syncsize,
877 word);
878 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, f_synctype,
879 normal);
880 if (arg & SPI_SLAVE) {
881 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
882 frame_polarity, inverted);
883 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
884 clk_polarity, neg);
885 SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
886 mode, SLAVE_INPUT);
887 } else {
888 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
889 frame_driver, inverted);
890 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
891 clk_driver, inverted);
892 SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL,
893 mode, MASTER_OUTPUT);
894 }
895 break;
896 case SSP_INBUFCHUNK:
897 #if 0
898 if (arg > port->in_buffer_size/NUM_IN_DESCR)
899 return -EINVAL;
900 port->inbufchunk = arg;
901 /* Make sure in_buffer_size is a multiple of inbufchunk */
902 port->in_buffer_size =
903 (port->in_buffer_size/port->inbufchunk) *
904 port->inbufchunk;
905 DEBUG(printk(KERN_DEBUG "inbufchunk %i in_buffer_size: %i\n",
906 port->inbufchunk, port->in_buffer_size));
907 if (port->use_dma) {
908 if (port->port_nbr == 0) {
909 RESET_DMA(9);
910 WAIT_DMA(9);
911 } else {
912 RESET_DMA(5);
913 WAIT_DMA(5);
914 }
915 start_dma_in(port);
916 }
917 #endif
918 break;
919 default:
920 return_val = -1;
921 }
922 /* Make sure we write the config without interruption */
923 local_irq_save(flags);
924 /* Set config and enable port */
925 *port->ctrl_data = port->ctrl_data_shadow;
926 nop(); nop(); nop(); nop();
927 *R_SYNC_SERIAL_PRESCALE = sync_serial_prescale_shadow;
928 nop(); nop(); nop(); nop();
929 if (dev)
930 SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, sync);
931 else
932 SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, sync);
933
934 *R_GEN_CONFIG_II = gen_config_ii_shadow;
935 /* Reset DMA. At readout from serial port the data could be shifted
936 * one byte if not resetting DMA.
937 */
938 if (port->use_dma) {
939 if (port->port_nbr == 0) {
940 RESET_DMA(9);
941 WAIT_DMA(9);
942 } else {
943 RESET_DMA(5);
944 WAIT_DMA(5);
945 }
946 start_dma_in(port);
947 }
948 local_irq_restore(flags);
949 return return_val;
950 }
951
952
953 static ssize_t sync_serial_write(struct file *file, const char *buf,
954 size_t count, loff_t *ppos)
955 {
956 int dev = MINOR(file->f_dentry->d_inode->i_rdev);
957 DECLARE_WAITQUEUE(wait, current);
958 struct sync_port *port;
959 unsigned long flags;
960 unsigned long c, c1;
961 unsigned long free_outp;
962 unsigned long outp;
963 unsigned long out_buffer;
964
965 if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) {
966 DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
967 return -ENODEV;
968 }
969 port = &ports[dev];
970
971 DEBUGWRITE(printk(KERN_DEBUG "W d%d c %lu (%d/%d)\n",
972 port->port_nbr, count, port->out_count, OUT_BUFFER_SIZE));
973 /* Space to end of buffer */
974 /*
975 * out_buffer <c1>012345<- c ->OUT_BUFFER_SIZE
976 * outp^ +out_count
977 * ^free_outp
978 * out_buffer 45<- c ->0123OUT_BUFFER_SIZE
979 * +out_count outp^
980 * free_outp
981 *
982 */
983
984 /* Read variables that may be updated by interrupts */
985 local_irq_save(flags);
986 if (count > OUT_BUFFER_SIZE - port->out_count)
987 count = OUT_BUFFER_SIZE - port->out_count;
988
989 outp = (unsigned long)port->outp;
990 free_outp = outp + port->out_count;
991 local_irq_restore(flags);
992 out_buffer = (unsigned long)port->out_buffer;
993
994 /* Find out where and how much to write */
995 if (free_outp >= out_buffer + OUT_BUFFER_SIZE)
996 free_outp -= OUT_BUFFER_SIZE;
997 if (free_outp >= outp)
998 c = out_buffer + OUT_BUFFER_SIZE - free_outp;
999 else
1000 c = outp - free_outp;
1001 if (c > count)
1002 c = count;
1003
1004 DEBUGWRITE(printk(KERN_DEBUG "w op %08lX fop %08lX c %lu\n",
1005 outp, free_outp, c));
1006 if (copy_from_user((void *)free_outp, buf, c))
1007 return -EFAULT;
1008
1009 if (c != count) {
1010 buf += c;
1011 c1 = count - c;
1012 DEBUGWRITE(printk(KERN_DEBUG "w2 fi %lu c %lu c1 %lu\n",
1013 free_outp-out_buffer, c, c1));
1014 if (copy_from_user((void *)out_buffer, buf, c1))
1015 return -EFAULT;
1016 }
1017 local_irq_save(flags);
1018 port->out_count += count;
1019 local_irq_restore(flags);
1020
1021 /* Make sure transmitter/receiver is running */
1022 if (!port->started) {
1023 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, clk_halt,
1024 running);
1025 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, tr_enable,
1026 enable);
1027 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, rec_enable,
1028 enable);
1029 port->started = 1;
1030 }
1031
1032 *port->ctrl_data = port->ctrl_data_shadow;
1033
1034 if (file->f_flags & O_NONBLOCK) {
1035 local_irq_save(flags);
1036 if (!port->tr_running) {
1037 if (!port->use_dma) {
1038 /* Start sender by writing data */
1039 send_word(port);
1040 /* and enable transmitter ready IRQ */
1041 *R_IRQ_MASK1_SET = 1 <<
1042 port->transmitter_ready_bit;
1043 } else
1044 start_dma(port,
1045 (unsigned char *volatile)port->outp, c);
1046 }
1047 local_irq_restore(flags);
1048 DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu NB\n",
1049 port->port_nbr, count));
1050 return count;
1051 }
1052
1053 /* Sleep until all sent */
1054 add_wait_queue(&port->out_wait_q, &wait);
1055 set_current_state(TASK_INTERRUPTIBLE);
1056 local_irq_save(flags);
1057 if (!port->tr_running) {
1058 if (!port->use_dma) {
1059 /* Start sender by writing data */
1060 send_word(port);
1061 /* and enable transmitter ready IRQ */
1062 *R_IRQ_MASK1_SET = 1 << port->transmitter_ready_bit;
1063 } else
1064 start_dma(port, port->outp, c);
1065 }
1066 local_irq_restore(flags);
1067 schedule();
1068 set_current_state(TASK_RUNNING);
1069 remove_wait_queue(&port->out_wait_q, &wait);
1070 if (signal_pending(current))
1071 return -EINTR;
1072
1073 DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu\n", port->port_nbr, count));
1074 return count;
1075 }
1076
1077 static ssize_t sync_serial_read(struct file *file, char *buf,
1078 size_t count, loff_t *ppos)
1079 {
1080 int dev = MINOR(file->f_dentry->d_inode->i_rdev);
1081 int avail;
1082 struct sync_port *port;
1083 unsigned char *start;
1084 unsigned char *end;
1085 unsigned long flags;
1086
1087 if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) {
1088 DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
1089 return -ENODEV;
1090 }
1091 port = &ports[dev];
1092
1093 DEBUGREAD(printk(KERN_DEBUG "R%d c %d ri %lu wi %lu /%lu\n",
1094 dev, count, port->readp - port->flip,
1095 port->writep - port->flip, port->in_buffer_size));
1096
1097 if (!port->started) {
1098 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, clk_halt,
1099 running);
1100 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, tr_enable,
1101 enable);
1102 SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, rec_enable,
1103 enable);
1104 port->started = 1;
1105 }
1106 *port->ctrl_data = port->ctrl_data_shadow;
1107
1108 /* Calculate number of available bytes */
1109 /* Save pointers to avoid that they are modified by interrupt */
1110 local_irq_save(flags);
1111 start = (unsigned char *)port->readp; /* cast away volatile */
1112 end = (unsigned char *)port->writep; /* cast away volatile */
1113 local_irq_restore(flags);
1114 while (start == end && !port->full) {
1115 /* No data */
1116 if (file->f_flags & O_NONBLOCK)
1117 return -EAGAIN;
1118
1119 interruptible_sleep_on(&port->in_wait_q);
1120 if (signal_pending(current))
1121 return -EINTR;
1122
1123 local_irq_save(flags);
1124 start = (unsigned char *)port->readp; /* cast away volatile */
1125 end = (unsigned char *)port->writep; /* cast away volatile */
1126 local_irq_restore(flags);
1127 }
1128
1129 /* Lazy read, never return wrapped data. */
1130 if (port->full)
1131 avail = port->in_buffer_size;
1132 else if (end > start)
1133 avail = end - start;
1134 else
1135 avail = port->flip + port->in_buffer_size - start;
1136
1137 count = count > avail ? avail : count;
1138 if (copy_to_user(buf, start, count))
1139 return -EFAULT;
1140 /* Disable interrupts while updating readp */
1141 local_irq_save(flags);
1142 port->readp += count;
1143 if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
1144 port->readp = port->flip;
1145 port->full = 0;
1146 local_irq_restore(flags);
1147 DEBUGREAD(printk(KERN_DEBUG "r %d\n", count));
1148 return count;
1149 }
1150
1151 static void send_word(struct sync_port *port)
1152 {
1153 switch (IO_EXTRACT(R_SYNC_SERIAL1_CTRL, wordsize,
1154 port->ctrl_data_shadow)) {
1155 case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size8bit):
1156 port->out_count--;
1157 *port->data_out = *port->outp++;
1158 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1159 port->outp = port->out_buffer;
1160 break;
1161 case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size12bit):
1162 {
1163 int data = (*port->outp++) << 8;
1164 data |= *port->outp++;
1165 port->out_count -= 2;
1166 *port->data_out = data;
1167 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1168 port->outp = port->out_buffer;
1169 break;
1170 }
1171 case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size16bit):
1172 port->out_count -= 2;
1173 *port->data_out = *(unsigned short *)port->outp;
1174 port->outp += 2;
1175 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1176 port->outp = port->out_buffer;
1177 break;
1178 case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size24bit):
1179 port->out_count -= 3;
1180 *port->data_out = *(unsigned int *)port->outp;
1181 port->outp += 3;
1182 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1183 port->outp = port->out_buffer;
1184 break;
1185 case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size32bit):
1186 port->out_count -= 4;
1187 *port->data_out = *(unsigned int *)port->outp;
1188 port->outp += 4;
1189 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1190 port->outp = port->out_buffer;
1191 break;
1192 }
1193 }
1194
1195
1196 static void start_dma(struct sync_port *port, const char *data, int count)
1197 {
1198 port->tr_running = 1;
1199 port->out_descr.hw_len = 0;
1200 port->out_descr.next = 0;
1201 port->out_descr.ctrl = d_eol | d_eop; /* No d_wait to avoid glitches */
1202 port->out_descr.sw_len = count;
1203 port->out_descr.buf = virt_to_phys(data);
1204 port->out_descr.status = 0;
1205
1206 *port->output_dma_first = virt_to_phys(&port->out_descr);
1207 *port->output_dma_cmd = IO_STATE(R_DMA_CH0_CMD, cmd, start);
1208 DEBUGTXINT(printk(KERN_DEBUG "dma %08lX c %d\n",
1209 (unsigned long)data, count));
1210 }
1211
1212 static void start_dma_in(struct sync_port *port)
1213 {
1214 int i;
1215 unsigned long buf;
1216 port->writep = port->flip;
1217
1218 if (port->writep > port->flip + port->in_buffer_size) {
1219 panic("Offset too large in sync serial driver\n");
1220 return;
1221 }
1222 buf = virt_to_phys(port->in_buffer);
1223 for (i = 0; i < NUM_IN_DESCR; i++) {
1224 port->in_descr[i].sw_len = port->inbufchunk;
1225 port->in_descr[i].ctrl = d_int;
1226 port->in_descr[i].next = virt_to_phys(&port->in_descr[i+1]);
1227 port->in_descr[i].buf = buf;
1228 port->in_descr[i].hw_len = 0;
1229 port->in_descr[i].status = 0;
1230 port->in_descr[i].fifo_len = 0;
1231 buf += port->inbufchunk;
1232 prepare_rx_descriptor(&port->in_descr[i]);
1233 }
1234 /* Link the last descriptor to the first */
1235 port->in_descr[i-1].next = virt_to_phys(&port->in_descr[0]);
1236 port->in_descr[i-1].ctrl |= d_eol;
1237 port->next_rx_desc = &port->in_descr[0];
1238 port->prev_rx_desc = &port->in_descr[NUM_IN_DESCR - 1];
1239 *port->input_dma_first = virt_to_phys(port->next_rx_desc);
1240 *port->input_dma_cmd = IO_STATE(R_DMA_CH0_CMD, cmd, start);
1241 }
1242
1243 #ifdef SYNC_SER_DMA
1244 static irqreturn_t tr_interrupt(int irq, void *dev_id)
1245 {
1246 unsigned long ireg = *R_IRQ_MASK2_RD;
1247 struct etrax_dma_descr *descr;
1248 unsigned int sentl;
1249 int handled = 0;
1250 int i;
1251
1252 for (i = 0; i < NUMBER_OF_PORTS; i++) {
1253 struct sync_port *port = &ports[i];
1254 if (!port->enabled || !port->use_dma)
1255 continue;
1256
1257 /* IRQ active for the port? */
1258 if (!(ireg & (1 << port->output_dma_bit)))
1259 continue;
1260
1261 handled = 1;
1262
1263 /* Clear IRQ */
1264 *port->output_dma_clr_irq =
1265 IO_STATE(R_DMA_CH0_CLR_INTR, clr_eop, do) |
1266 IO_STATE(R_DMA_CH0_CLR_INTR, clr_descr, do);
1267
1268 descr = &port->out_descr;
1269 if (!(descr->status & d_stop))
1270 sentl = descr->sw_len;
1271 else
1272 /* Otherwise find amount of data sent here */
1273 sentl = descr->hw_len;
1274
1275 port->out_count -= sentl;
1276 port->outp += sentl;
1277 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1278 port->outp = port->out_buffer;
1279 if (port->out_count) {
1280 int c = port->out_buffer + OUT_BUFFER_SIZE - port->outp;
1281 if (c > port->out_count)
1282 c = port->out_count;
1283 DEBUGTXINT(printk(KERN_DEBUG
1284 "tx_int DMAWRITE %i %i\n", sentl, c));
1285 start_dma(port, port->outp, c);
1286 } else {
1287 DEBUGTXINT(printk(KERN_DEBUG
1288 "tx_int DMA stop %i\n", sentl));
1289 port->tr_running = 0;
1290 }
1291 /* wake up the waiting process */
1292 wake_up_interruptible(&port->out_wait_q);
1293 }
1294 return IRQ_RETVAL(handled);
1295 } /* tr_interrupt */
1296
1297 static irqreturn_t rx_interrupt(int irq, void *dev_id)
1298 {
1299 unsigned long ireg = *R_IRQ_MASK2_RD;
1300 int i;
1301 int handled = 0;
1302
1303 for (i = 0; i < NUMBER_OF_PORTS; i++) {
1304 struct sync_port *port = &ports[i];
1305
1306 if (!port->enabled || !port->use_dma)
1307 continue;
1308
1309 if (!(ireg & (1 << port->input_dma_descr_bit)))
1310 continue;
1311
1312 /* Descriptor interrupt */
1313 handled = 1;
1314 while (*port->input_dma_descr !=
1315 virt_to_phys(port->next_rx_desc)) {
1316 if (port->writep + port->inbufchunk > port->flip +
1317 port->in_buffer_size) {
1318 int first_size = port->flip +
1319 port->in_buffer_size - port->writep;
1320 memcpy(port->writep,
1321 phys_to_virt(port->next_rx_desc->buf),
1322 first_size);
1323 memcpy(port->flip,
1324 phys_to_virt(port->next_rx_desc->buf +
1325 first_size),
1326 port->inbufchunk - first_size);
1327 port->writep = port->flip +
1328 port->inbufchunk - first_size;
1329 } else {
1330 memcpy(port->writep,
1331 phys_to_virt(port->next_rx_desc->buf),
1332 port->inbufchunk);
1333 port->writep += port->inbufchunk;
1334 if (port->writep >= port->flip
1335 + port->in_buffer_size)
1336 port->writep = port->flip;
1337 }
1338 if (port->writep == port->readp)
1339 port->full = 1;
1340 prepare_rx_descriptor(port->next_rx_desc);
1341 port->next_rx_desc->ctrl |= d_eol;
1342 port->prev_rx_desc->ctrl &= ~d_eol;
1343 port->prev_rx_desc = phys_to_virt((unsigned)
1344 port->next_rx_desc);
1345 port->next_rx_desc = phys_to_virt((unsigned)
1346 port->next_rx_desc->next);
1347 /* Wake up the waiting process */
1348 wake_up_interruptible(&port->in_wait_q);
1349 *port->input_dma_cmd = IO_STATE(R_DMA_CH1_CMD,
1350 cmd, restart);
1351 /* DMA has reached end of descriptor */
1352 *port->input_dma_clr_irq = IO_STATE(R_DMA_CH0_CLR_INTR,
1353 clr_descr, do);
1354 }
1355 }
1356 return IRQ_RETVAL(handled);
1357 } /* rx_interrupt */
1358 #endif /* SYNC_SER_DMA */
1359
1360 #ifdef SYNC_SER_MANUAL
1361 static irqreturn_t manual_interrupt(int irq, void *dev_id)
1362 {
1363 int i;
1364 int handled = 0;
1365
1366 for (i = 0; i < NUMBER_OF_PORTS; i++) {
1367 struct sync_port *port = &ports[i];
1368
1369 if (!port->enabled || port->use_dma)
1370 continue;
1371
1372 /* Data received? */
1373 if (*R_IRQ_MASK1_RD & (1 << port->data_avail_bit)) {
1374 handled = 1;
1375 /* Read data */
1376 switch (port->ctrl_data_shadow &
1377 IO_MASK(R_SYNC_SERIAL1_CTRL, wordsize)) {
1378 case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size8bit):
1379 *port->writep++ =
1380 *(volatile char *)port->data_in;
1381 break;
1382 case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size12bit):
1383 {
1384 int data = *(unsigned short *)port->data_in;
1385 *port->writep = (data & 0x0ff0) >> 4;
1386 *(port->writep + 1) = data & 0x0f;
1387 port->writep += 2;
1388 break;
1389 }
1390 case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size16bit):
1391 *(unsigned short *)port->writep =
1392 *(volatile unsigned short *)port->data_in;
1393 port->writep += 2;
1394 break;
1395 case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size24bit):
1396 *(unsigned int *)port->writep = *port->data_in;
1397 port->writep += 3;
1398 break;
1399 case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size32bit):
1400 *(unsigned int *)port->writep = *port->data_in;
1401 port->writep += 4;
1402 break;
1403 }
1404
1405 /* Wrap? */
1406 if (port->writep >= port->flip + port->in_buffer_size)
1407 port->writep = port->flip;
1408 if (port->writep == port->readp) {
1409 /* Receive buffer overrun, discard oldest */
1410 port->readp++;
1411 /* Wrap? */
1412 if (port->readp >= port->flip +
1413 port->in_buffer_size)
1414 port->readp = port->flip;
1415 }
1416 if (sync_data_avail(port) >= port->inbufchunk) {
1417 /* Wake up application */
1418 wake_up_interruptible(&port->in_wait_q);
1419 }
1420 }
1421
1422 /* Transmitter ready? */
1423 if (*R_IRQ_MASK1_RD & (1 << port->transmitter_ready_bit)) {
1424 if (port->out_count > 0) {
1425 /* More data to send */
1426 send_word(port);
1427 } else {
1428 /* Transmission finished */
1429 /* Turn off IRQ */
1430 *R_IRQ_MASK1_CLR = 1 <<
1431 port->transmitter_ready_bit;
1432 /* Wake up application */
1433 wake_up_interruptible(&port->out_wait_q);
1434 }
1435 }
1436 }
1437 return IRQ_RETVAL(handled);
1438 }
1439 #endif
1440
1441 module_init(etrax_sync_serial_init);
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