1 /*
2 * sound/soc/omap/mcbsp.c
3 *
4 * Copyright (C) 2004 Nokia Corporation
5 * Author: Samuel Ortiz <samuel.ortiz@nokia.com>
6 *
7 * Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
8 * Peter Ujfalusi <peter.ujfalusi@ti.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * Multichannel mode not supported.
15 */
16
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/device.h>
20 #include <linux/platform_device.h>
21 #include <linux/interrupt.h>
22 #include <linux/err.h>
23 #include <linux/clk.h>
24 #include <linux/delay.h>
25 #include <linux/io.h>
26 #include <linux/slab.h>
27
28 #include <plat/mcbsp.h>
29
30 #include "mcbsp.h"
31
omap_mcbsp_write(struct omap_mcbsp * mcbsp,u16 reg,u32 val)32 static void omap_mcbsp_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
33 {
34 void __iomem *addr = mcbsp->io_base + reg * mcbsp->pdata->reg_step;
35
36 if (mcbsp->pdata->reg_size == 2) {
37 ((u16 *)mcbsp->reg_cache)[reg] = (u16)val;
38 __raw_writew((u16)val, addr);
39 } else {
40 ((u32 *)mcbsp->reg_cache)[reg] = val;
41 __raw_writel(val, addr);
42 }
43 }
44
omap_mcbsp_read(struct omap_mcbsp * mcbsp,u16 reg,bool from_cache)45 static int omap_mcbsp_read(struct omap_mcbsp *mcbsp, u16 reg, bool from_cache)
46 {
47 void __iomem *addr = mcbsp->io_base + reg * mcbsp->pdata->reg_step;
48
49 if (mcbsp->pdata->reg_size == 2) {
50 return !from_cache ? __raw_readw(addr) :
51 ((u16 *)mcbsp->reg_cache)[reg];
52 } else {
53 return !from_cache ? __raw_readl(addr) :
54 ((u32 *)mcbsp->reg_cache)[reg];
55 }
56 }
57
omap_mcbsp_st_write(struct omap_mcbsp * mcbsp,u16 reg,u32 val)58 static void omap_mcbsp_st_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
59 {
60 __raw_writel(val, mcbsp->st_data->io_base_st + reg);
61 }
62
omap_mcbsp_st_read(struct omap_mcbsp * mcbsp,u16 reg)63 static int omap_mcbsp_st_read(struct omap_mcbsp *mcbsp, u16 reg)
64 {
65 return __raw_readl(mcbsp->st_data->io_base_st + reg);
66 }
67
68 #define MCBSP_READ(mcbsp, reg) \
69 omap_mcbsp_read(mcbsp, OMAP_MCBSP_REG_##reg, 0)
70 #define MCBSP_WRITE(mcbsp, reg, val) \
71 omap_mcbsp_write(mcbsp, OMAP_MCBSP_REG_##reg, val)
72 #define MCBSP_READ_CACHE(mcbsp, reg) \
73 omap_mcbsp_read(mcbsp, OMAP_MCBSP_REG_##reg, 1)
74
75 #define MCBSP_ST_READ(mcbsp, reg) \
76 omap_mcbsp_st_read(mcbsp, OMAP_ST_REG_##reg)
77 #define MCBSP_ST_WRITE(mcbsp, reg, val) \
78 omap_mcbsp_st_write(mcbsp, OMAP_ST_REG_##reg, val)
79
omap_mcbsp_dump_reg(struct omap_mcbsp * mcbsp)80 static void omap_mcbsp_dump_reg(struct omap_mcbsp *mcbsp)
81 {
82 dev_dbg(mcbsp->dev, "**** McBSP%d regs ****\n", mcbsp->id);
83 dev_dbg(mcbsp->dev, "DRR2: 0x%04x\n",
84 MCBSP_READ(mcbsp, DRR2));
85 dev_dbg(mcbsp->dev, "DRR1: 0x%04x\n",
86 MCBSP_READ(mcbsp, DRR1));
87 dev_dbg(mcbsp->dev, "DXR2: 0x%04x\n",
88 MCBSP_READ(mcbsp, DXR2));
89 dev_dbg(mcbsp->dev, "DXR1: 0x%04x\n",
90 MCBSP_READ(mcbsp, DXR1));
91 dev_dbg(mcbsp->dev, "SPCR2: 0x%04x\n",
92 MCBSP_READ(mcbsp, SPCR2));
93 dev_dbg(mcbsp->dev, "SPCR1: 0x%04x\n",
94 MCBSP_READ(mcbsp, SPCR1));
95 dev_dbg(mcbsp->dev, "RCR2: 0x%04x\n",
96 MCBSP_READ(mcbsp, RCR2));
97 dev_dbg(mcbsp->dev, "RCR1: 0x%04x\n",
98 MCBSP_READ(mcbsp, RCR1));
99 dev_dbg(mcbsp->dev, "XCR2: 0x%04x\n",
100 MCBSP_READ(mcbsp, XCR2));
101 dev_dbg(mcbsp->dev, "XCR1: 0x%04x\n",
102 MCBSP_READ(mcbsp, XCR1));
103 dev_dbg(mcbsp->dev, "SRGR2: 0x%04x\n",
104 MCBSP_READ(mcbsp, SRGR2));
105 dev_dbg(mcbsp->dev, "SRGR1: 0x%04x\n",
106 MCBSP_READ(mcbsp, SRGR1));
107 dev_dbg(mcbsp->dev, "PCR0: 0x%04x\n",
108 MCBSP_READ(mcbsp, PCR0));
109 dev_dbg(mcbsp->dev, "***********************\n");
110 }
111
omap_mcbsp_tx_irq_handler(int irq,void * dev_id)112 static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id)
113 {
114 struct omap_mcbsp *mcbsp_tx = dev_id;
115 u16 irqst_spcr2;
116
117 irqst_spcr2 = MCBSP_READ(mcbsp_tx, SPCR2);
118 dev_dbg(mcbsp_tx->dev, "TX IRQ callback : 0x%x\n", irqst_spcr2);
119
120 if (irqst_spcr2 & XSYNC_ERR) {
121 dev_err(mcbsp_tx->dev, "TX Frame Sync Error! : 0x%x\n",
122 irqst_spcr2);
123 /* Writing zero to XSYNC_ERR clears the IRQ */
124 MCBSP_WRITE(mcbsp_tx, SPCR2, MCBSP_READ_CACHE(mcbsp_tx, SPCR2));
125 }
126
127 return IRQ_HANDLED;
128 }
129
omap_mcbsp_rx_irq_handler(int irq,void * dev_id)130 static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id)
131 {
132 struct omap_mcbsp *mcbsp_rx = dev_id;
133 u16 irqst_spcr1;
134
135 irqst_spcr1 = MCBSP_READ(mcbsp_rx, SPCR1);
136 dev_dbg(mcbsp_rx->dev, "RX IRQ callback : 0x%x\n", irqst_spcr1);
137
138 if (irqst_spcr1 & RSYNC_ERR) {
139 dev_err(mcbsp_rx->dev, "RX Frame Sync Error! : 0x%x\n",
140 irqst_spcr1);
141 /* Writing zero to RSYNC_ERR clears the IRQ */
142 MCBSP_WRITE(mcbsp_rx, SPCR1, MCBSP_READ_CACHE(mcbsp_rx, SPCR1));
143 }
144
145 return IRQ_HANDLED;
146 }
147
148 /*
149 * omap_mcbsp_config simply write a config to the
150 * appropriate McBSP.
151 * You either call this function or set the McBSP registers
152 * by yourself before calling omap_mcbsp_start().
153 */
omap_mcbsp_config(struct omap_mcbsp * mcbsp,const struct omap_mcbsp_reg_cfg * config)154 void omap_mcbsp_config(struct omap_mcbsp *mcbsp,
155 const struct omap_mcbsp_reg_cfg *config)
156 {
157 dev_dbg(mcbsp->dev, "Configuring McBSP%d phys_base: 0x%08lx\n",
158 mcbsp->id, mcbsp->phys_base);
159
160 /* We write the given config */
161 MCBSP_WRITE(mcbsp, SPCR2, config->spcr2);
162 MCBSP_WRITE(mcbsp, SPCR1, config->spcr1);
163 MCBSP_WRITE(mcbsp, RCR2, config->rcr2);
164 MCBSP_WRITE(mcbsp, RCR1, config->rcr1);
165 MCBSP_WRITE(mcbsp, XCR2, config->xcr2);
166 MCBSP_WRITE(mcbsp, XCR1, config->xcr1);
167 MCBSP_WRITE(mcbsp, SRGR2, config->srgr2);
168 MCBSP_WRITE(mcbsp, SRGR1, config->srgr1);
169 MCBSP_WRITE(mcbsp, MCR2, config->mcr2);
170 MCBSP_WRITE(mcbsp, MCR1, config->mcr1);
171 MCBSP_WRITE(mcbsp, PCR0, config->pcr0);
172 if (mcbsp->pdata->has_ccr) {
173 MCBSP_WRITE(mcbsp, XCCR, config->xccr);
174 MCBSP_WRITE(mcbsp, RCCR, config->rccr);
175 }
176 /* Enable wakeup behavior */
177 if (mcbsp->pdata->has_wakeup)
178 MCBSP_WRITE(mcbsp, WAKEUPEN, XRDYEN | RRDYEN);
179 }
180
181 /**
182 * omap_mcbsp_dma_reg_params - returns the address of mcbsp data register
183 * @id - mcbsp id
184 * @stream - indicates the direction of data flow (rx or tx)
185 *
186 * Returns the address of mcbsp data transmit register or data receive register
187 * to be used by DMA for transferring/receiving data based on the value of
188 * @stream for the requested mcbsp given by @id
189 */
omap_mcbsp_dma_reg_params(struct omap_mcbsp * mcbsp,unsigned int stream)190 static int omap_mcbsp_dma_reg_params(struct omap_mcbsp *mcbsp,
191 unsigned int stream)
192 {
193 int data_reg;
194
195 if (mcbsp->pdata->reg_size == 2) {
196 if (stream)
197 data_reg = OMAP_MCBSP_REG_DRR1;
198 else
199 data_reg = OMAP_MCBSP_REG_DXR1;
200 } else {
201 if (stream)
202 data_reg = OMAP_MCBSP_REG_DRR;
203 else
204 data_reg = OMAP_MCBSP_REG_DXR;
205 }
206
207 return mcbsp->phys_dma_base + data_reg * mcbsp->pdata->reg_step;
208 }
209
omap_st_on(struct omap_mcbsp * mcbsp)210 static void omap_st_on(struct omap_mcbsp *mcbsp)
211 {
212 unsigned int w;
213
214 if (mcbsp->pdata->enable_st_clock)
215 mcbsp->pdata->enable_st_clock(mcbsp->id, 1);
216
217 /* Enable McBSP Sidetone */
218 w = MCBSP_READ(mcbsp, SSELCR);
219 MCBSP_WRITE(mcbsp, SSELCR, w | SIDETONEEN);
220
221 /* Enable Sidetone from Sidetone Core */
222 w = MCBSP_ST_READ(mcbsp, SSELCR);
223 MCBSP_ST_WRITE(mcbsp, SSELCR, w | ST_SIDETONEEN);
224 }
225
omap_st_off(struct omap_mcbsp * mcbsp)226 static void omap_st_off(struct omap_mcbsp *mcbsp)
227 {
228 unsigned int w;
229
230 w = MCBSP_ST_READ(mcbsp, SSELCR);
231 MCBSP_ST_WRITE(mcbsp, SSELCR, w & ~(ST_SIDETONEEN));
232
233 w = MCBSP_READ(mcbsp, SSELCR);
234 MCBSP_WRITE(mcbsp, SSELCR, w & ~(SIDETONEEN));
235
236 if (mcbsp->pdata->enable_st_clock)
237 mcbsp->pdata->enable_st_clock(mcbsp->id, 0);
238 }
239
omap_st_fir_write(struct omap_mcbsp * mcbsp,s16 * fir)240 static void omap_st_fir_write(struct omap_mcbsp *mcbsp, s16 *fir)
241 {
242 u16 val, i;
243
244 val = MCBSP_ST_READ(mcbsp, SSELCR);
245
246 if (val & ST_COEFFWREN)
247 MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
248
249 MCBSP_ST_WRITE(mcbsp, SSELCR, val | ST_COEFFWREN);
250
251 for (i = 0; i < 128; i++)
252 MCBSP_ST_WRITE(mcbsp, SFIRCR, fir[i]);
253
254 i = 0;
255
256 val = MCBSP_ST_READ(mcbsp, SSELCR);
257 while (!(val & ST_COEFFWRDONE) && (++i < 1000))
258 val = MCBSP_ST_READ(mcbsp, SSELCR);
259
260 MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
261
262 if (i == 1000)
263 dev_err(mcbsp->dev, "McBSP FIR load error!\n");
264 }
265
omap_st_chgain(struct omap_mcbsp * mcbsp)266 static void omap_st_chgain(struct omap_mcbsp *mcbsp)
267 {
268 u16 w;
269 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
270
271 w = MCBSP_ST_READ(mcbsp, SSELCR);
272
273 MCBSP_ST_WRITE(mcbsp, SGAINCR, ST_CH0GAIN(st_data->ch0gain) | \
274 ST_CH1GAIN(st_data->ch1gain));
275 }
276
omap_st_set_chgain(struct omap_mcbsp * mcbsp,int channel,s16 chgain)277 int omap_st_set_chgain(struct omap_mcbsp *mcbsp, int channel, s16 chgain)
278 {
279 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
280 int ret = 0;
281
282 if (!st_data)
283 return -ENOENT;
284
285 spin_lock_irq(&mcbsp->lock);
286 if (channel == 0)
287 st_data->ch0gain = chgain;
288 else if (channel == 1)
289 st_data->ch1gain = chgain;
290 else
291 ret = -EINVAL;
292
293 if (st_data->enabled)
294 omap_st_chgain(mcbsp);
295 spin_unlock_irq(&mcbsp->lock);
296
297 return ret;
298 }
299
omap_st_get_chgain(struct omap_mcbsp * mcbsp,int channel,s16 * chgain)300 int omap_st_get_chgain(struct omap_mcbsp *mcbsp, int channel, s16 *chgain)
301 {
302 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
303 int ret = 0;
304
305 if (!st_data)
306 return -ENOENT;
307
308 spin_lock_irq(&mcbsp->lock);
309 if (channel == 0)
310 *chgain = st_data->ch0gain;
311 else if (channel == 1)
312 *chgain = st_data->ch1gain;
313 else
314 ret = -EINVAL;
315 spin_unlock_irq(&mcbsp->lock);
316
317 return ret;
318 }
319
omap_st_start(struct omap_mcbsp * mcbsp)320 static int omap_st_start(struct omap_mcbsp *mcbsp)
321 {
322 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
323
324 if (st_data->enabled && !st_data->running) {
325 omap_st_fir_write(mcbsp, st_data->taps);
326 omap_st_chgain(mcbsp);
327
328 if (!mcbsp->free) {
329 omap_st_on(mcbsp);
330 st_data->running = 1;
331 }
332 }
333
334 return 0;
335 }
336
omap_st_enable(struct omap_mcbsp * mcbsp)337 int omap_st_enable(struct omap_mcbsp *mcbsp)
338 {
339 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
340
341 if (!st_data)
342 return -ENODEV;
343
344 spin_lock_irq(&mcbsp->lock);
345 st_data->enabled = 1;
346 omap_st_start(mcbsp);
347 spin_unlock_irq(&mcbsp->lock);
348
349 return 0;
350 }
351
omap_st_stop(struct omap_mcbsp * mcbsp)352 static int omap_st_stop(struct omap_mcbsp *mcbsp)
353 {
354 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
355
356 if (st_data->running) {
357 if (!mcbsp->free) {
358 omap_st_off(mcbsp);
359 st_data->running = 0;
360 }
361 }
362
363 return 0;
364 }
365
omap_st_disable(struct omap_mcbsp * mcbsp)366 int omap_st_disable(struct omap_mcbsp *mcbsp)
367 {
368 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
369 int ret = 0;
370
371 if (!st_data)
372 return -ENODEV;
373
374 spin_lock_irq(&mcbsp->lock);
375 omap_st_stop(mcbsp);
376 st_data->enabled = 0;
377 spin_unlock_irq(&mcbsp->lock);
378
379 return ret;
380 }
381
omap_st_is_enabled(struct omap_mcbsp * mcbsp)382 int omap_st_is_enabled(struct omap_mcbsp *mcbsp)
383 {
384 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
385
386 if (!st_data)
387 return -ENODEV;
388
389 return st_data->enabled;
390 }
391
392 /*
393 * omap_mcbsp_set_rx_threshold configures the transmit threshold in words.
394 * The threshold parameter is 1 based, and it is converted (threshold - 1)
395 * for the THRSH2 register.
396 */
omap_mcbsp_set_tx_threshold(struct omap_mcbsp * mcbsp,u16 threshold)397 void omap_mcbsp_set_tx_threshold(struct omap_mcbsp *mcbsp, u16 threshold)
398 {
399 if (mcbsp->pdata->buffer_size == 0)
400 return;
401
402 if (threshold && threshold <= mcbsp->max_tx_thres)
403 MCBSP_WRITE(mcbsp, THRSH2, threshold - 1);
404 }
405
406 /*
407 * omap_mcbsp_set_rx_threshold configures the receive threshold in words.
408 * The threshold parameter is 1 based, and it is converted (threshold - 1)
409 * for the THRSH1 register.
410 */
omap_mcbsp_set_rx_threshold(struct omap_mcbsp * mcbsp,u16 threshold)411 void omap_mcbsp_set_rx_threshold(struct omap_mcbsp *mcbsp, u16 threshold)
412 {
413 if (mcbsp->pdata->buffer_size == 0)
414 return;
415
416 if (threshold && threshold <= mcbsp->max_rx_thres)
417 MCBSP_WRITE(mcbsp, THRSH1, threshold - 1);
418 }
419
420 /*
421 * omap_mcbsp_get_tx_delay returns the number of used slots in the McBSP FIFO
422 */
omap_mcbsp_get_tx_delay(struct omap_mcbsp * mcbsp)423 u16 omap_mcbsp_get_tx_delay(struct omap_mcbsp *mcbsp)
424 {
425 u16 buffstat;
426
427 if (mcbsp->pdata->buffer_size == 0)
428 return 0;
429
430 /* Returns the number of free locations in the buffer */
431 buffstat = MCBSP_READ(mcbsp, XBUFFSTAT);
432
433 /* Number of slots are different in McBSP ports */
434 return mcbsp->pdata->buffer_size - buffstat;
435 }
436
437 /*
438 * omap_mcbsp_get_rx_delay returns the number of free slots in the McBSP FIFO
439 * to reach the threshold value (when the DMA will be triggered to read it)
440 */
omap_mcbsp_get_rx_delay(struct omap_mcbsp * mcbsp)441 u16 omap_mcbsp_get_rx_delay(struct omap_mcbsp *mcbsp)
442 {
443 u16 buffstat, threshold;
444
445 if (mcbsp->pdata->buffer_size == 0)
446 return 0;
447
448 /* Returns the number of used locations in the buffer */
449 buffstat = MCBSP_READ(mcbsp, RBUFFSTAT);
450 /* RX threshold */
451 threshold = MCBSP_READ(mcbsp, THRSH1);
452
453 /* Return the number of location till we reach the threshold limit */
454 if (threshold <= buffstat)
455 return 0;
456 else
457 return threshold - buffstat;
458 }
459
omap_mcbsp_request(struct omap_mcbsp * mcbsp)460 int omap_mcbsp_request(struct omap_mcbsp *mcbsp)
461 {
462 void *reg_cache;
463 int err;
464
465 reg_cache = kzalloc(mcbsp->reg_cache_size, GFP_KERNEL);
466 if (!reg_cache) {
467 return -ENOMEM;
468 }
469
470 spin_lock(&mcbsp->lock);
471 if (!mcbsp->free) {
472 dev_err(mcbsp->dev, "McBSP%d is currently in use\n",
473 mcbsp->id);
474 err = -EBUSY;
475 goto err_kfree;
476 }
477
478 mcbsp->free = false;
479 mcbsp->reg_cache = reg_cache;
480 spin_unlock(&mcbsp->lock);
481
482 if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->request)
483 mcbsp->pdata->ops->request(mcbsp->id - 1);
484
485 /*
486 * Make sure that transmitter, receiver and sample-rate generator are
487 * not running before activating IRQs.
488 */
489 MCBSP_WRITE(mcbsp, SPCR1, 0);
490 MCBSP_WRITE(mcbsp, SPCR2, 0);
491
492 err = request_irq(mcbsp->tx_irq, omap_mcbsp_tx_irq_handler,
493 0, "McBSP", (void *)mcbsp);
494 if (err != 0) {
495 dev_err(mcbsp->dev, "Unable to request TX IRQ %d "
496 "for McBSP%d\n", mcbsp->tx_irq,
497 mcbsp->id);
498 goto err_clk_disable;
499 }
500
501 if (mcbsp->rx_irq) {
502 err = request_irq(mcbsp->rx_irq,
503 omap_mcbsp_rx_irq_handler,
504 0, "McBSP", (void *)mcbsp);
505 if (err != 0) {
506 dev_err(mcbsp->dev, "Unable to request RX IRQ %d "
507 "for McBSP%d\n", mcbsp->rx_irq,
508 mcbsp->id);
509 goto err_free_irq;
510 }
511 }
512
513 return 0;
514 err_free_irq:
515 free_irq(mcbsp->tx_irq, (void *)mcbsp);
516 err_clk_disable:
517 if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
518 mcbsp->pdata->ops->free(mcbsp->id - 1);
519
520 /* Disable wakeup behavior */
521 if (mcbsp->pdata->has_wakeup)
522 MCBSP_WRITE(mcbsp, WAKEUPEN, 0);
523
524 spin_lock(&mcbsp->lock);
525 mcbsp->free = true;
526 mcbsp->reg_cache = NULL;
527 err_kfree:
528 spin_unlock(&mcbsp->lock);
529 kfree(reg_cache);
530
531 return err;
532 }
533
omap_mcbsp_free(struct omap_mcbsp * mcbsp)534 void omap_mcbsp_free(struct omap_mcbsp *mcbsp)
535 {
536 void *reg_cache;
537
538 if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
539 mcbsp->pdata->ops->free(mcbsp->id - 1);
540
541 /* Disable wakeup behavior */
542 if (mcbsp->pdata->has_wakeup)
543 MCBSP_WRITE(mcbsp, WAKEUPEN, 0);
544
545 if (mcbsp->rx_irq)
546 free_irq(mcbsp->rx_irq, (void *)mcbsp);
547 free_irq(mcbsp->tx_irq, (void *)mcbsp);
548
549 reg_cache = mcbsp->reg_cache;
550
551 /*
552 * Select CLKS source from internal source unconditionally before
553 * marking the McBSP port as free.
554 * If the external clock source via MCBSP_CLKS pin has been selected the
555 * system will refuse to enter idle if the CLKS pin source is not reset
556 * back to internal source.
557 */
558 if (!cpu_class_is_omap1())
559 omap2_mcbsp_set_clks_src(mcbsp, MCBSP_CLKS_PRCM_SRC);
560
561 spin_lock(&mcbsp->lock);
562 if (mcbsp->free)
563 dev_err(mcbsp->dev, "McBSP%d was not reserved\n", mcbsp->id);
564 else
565 mcbsp->free = true;
566 mcbsp->reg_cache = NULL;
567 spin_unlock(&mcbsp->lock);
568
569 if (reg_cache)
570 kfree(reg_cache);
571 }
572
573 /*
574 * Here we start the McBSP, by enabling transmitter, receiver or both.
575 * If no transmitter or receiver is active prior calling, then sample-rate
576 * generator and frame sync are started.
577 */
omap_mcbsp_start(struct omap_mcbsp * mcbsp,int tx,int rx)578 void omap_mcbsp_start(struct omap_mcbsp *mcbsp, int tx, int rx)
579 {
580 int enable_srg = 0;
581 u16 w;
582
583 if (mcbsp->st_data)
584 omap_st_start(mcbsp);
585
586 /* Only enable SRG, if McBSP is master */
587 w = MCBSP_READ_CACHE(mcbsp, PCR0);
588 if (w & (FSXM | FSRM | CLKXM | CLKRM))
589 enable_srg = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
590 MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
591
592 if (enable_srg) {
593 /* Start the sample generator */
594 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
595 MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 6));
596 }
597
598 /* Enable transmitter and receiver */
599 tx &= 1;
600 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
601 MCBSP_WRITE(mcbsp, SPCR2, w | tx);
602
603 rx &= 1;
604 w = MCBSP_READ_CACHE(mcbsp, SPCR1);
605 MCBSP_WRITE(mcbsp, SPCR1, w | rx);
606
607 /*
608 * Worst case: CLKSRG*2 = 8000khz: (1/8000) * 2 * 2 usec
609 * REVISIT: 100us may give enough time for two CLKSRG, however
610 * due to some unknown PM related, clock gating etc. reason it
611 * is now at 500us.
612 */
613 udelay(500);
614
615 if (enable_srg) {
616 /* Start frame sync */
617 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
618 MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 7));
619 }
620
621 if (mcbsp->pdata->has_ccr) {
622 /* Release the transmitter and receiver */
623 w = MCBSP_READ_CACHE(mcbsp, XCCR);
624 w &= ~(tx ? XDISABLE : 0);
625 MCBSP_WRITE(mcbsp, XCCR, w);
626 w = MCBSP_READ_CACHE(mcbsp, RCCR);
627 w &= ~(rx ? RDISABLE : 0);
628 MCBSP_WRITE(mcbsp, RCCR, w);
629 }
630
631 /* Dump McBSP Regs */
632 omap_mcbsp_dump_reg(mcbsp);
633 }
634
omap_mcbsp_stop(struct omap_mcbsp * mcbsp,int tx,int rx)635 void omap_mcbsp_stop(struct omap_mcbsp *mcbsp, int tx, int rx)
636 {
637 int idle;
638 u16 w;
639
640 /* Reset transmitter */
641 tx &= 1;
642 if (mcbsp->pdata->has_ccr) {
643 w = MCBSP_READ_CACHE(mcbsp, XCCR);
644 w |= (tx ? XDISABLE : 0);
645 MCBSP_WRITE(mcbsp, XCCR, w);
646 }
647 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
648 MCBSP_WRITE(mcbsp, SPCR2, w & ~tx);
649
650 /* Reset receiver */
651 rx &= 1;
652 if (mcbsp->pdata->has_ccr) {
653 w = MCBSP_READ_CACHE(mcbsp, RCCR);
654 w |= (rx ? RDISABLE : 0);
655 MCBSP_WRITE(mcbsp, RCCR, w);
656 }
657 w = MCBSP_READ_CACHE(mcbsp, SPCR1);
658 MCBSP_WRITE(mcbsp, SPCR1, w & ~rx);
659
660 idle = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
661 MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
662
663 if (idle) {
664 /* Reset the sample rate generator */
665 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
666 MCBSP_WRITE(mcbsp, SPCR2, w & ~(1 << 6));
667 }
668
669 if (mcbsp->st_data)
670 omap_st_stop(mcbsp);
671 }
672
omap2_mcbsp_set_clks_src(struct omap_mcbsp * mcbsp,u8 fck_src_id)673 int omap2_mcbsp_set_clks_src(struct omap_mcbsp *mcbsp, u8 fck_src_id)
674 {
675 const char *src;
676
677 if (fck_src_id == MCBSP_CLKS_PAD_SRC)
678 src = "clks_ext";
679 else if (fck_src_id == MCBSP_CLKS_PRCM_SRC)
680 src = "clks_fclk";
681 else
682 return -EINVAL;
683
684 if (mcbsp->pdata->set_clk_src)
685 return mcbsp->pdata->set_clk_src(mcbsp->dev, mcbsp->fclk, src);
686 else
687 return -EINVAL;
688 }
689
omap_mcbsp_6pin_src_mux(struct omap_mcbsp * mcbsp,u8 mux)690 int omap_mcbsp_6pin_src_mux(struct omap_mcbsp *mcbsp, u8 mux)
691 {
692 const char *signal, *src;
693
694 if (!mcbsp->pdata->mux_signal)
695 return -EINVAL;
696
697 switch (mux) {
698 case CLKR_SRC_CLKR:
699 signal = "clkr";
700 src = "clkr";
701 break;
702 case CLKR_SRC_CLKX:
703 signal = "clkr";
704 src = "clkx";
705 break;
706 case FSR_SRC_FSR:
707 signal = "fsr";
708 src = "fsr";
709 break;
710 case FSR_SRC_FSX:
711 signal = "fsr";
712 src = "fsx";
713 break;
714 default:
715 return -EINVAL;
716 }
717
718 return mcbsp->pdata->mux_signal(mcbsp->dev, signal, src);
719 }
720
721 #define max_thres(m) (mcbsp->pdata->buffer_size)
722 #define valid_threshold(m, val) ((val) <= max_thres(m))
723 #define THRESHOLD_PROP_BUILDER(prop) \
724 static ssize_t prop##_show(struct device *dev, \
725 struct device_attribute *attr, char *buf) \
726 { \
727 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev); \
728 \
729 return sprintf(buf, "%u\n", mcbsp->prop); \
730 } \
731 \
732 static ssize_t prop##_store(struct device *dev, \
733 struct device_attribute *attr, \
734 const char *buf, size_t size) \
735 { \
736 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev); \
737 unsigned long val; \
738 int status; \
739 \
740 status = strict_strtoul(buf, 0, &val); \
741 if (status) \
742 return status; \
743 \
744 if (!valid_threshold(mcbsp, val)) \
745 return -EDOM; \
746 \
747 mcbsp->prop = val; \
748 return size; \
749 } \
750 \
751 static DEVICE_ATTR(prop, 0644, prop##_show, prop##_store);
752
753 THRESHOLD_PROP_BUILDER(max_tx_thres);
754 THRESHOLD_PROP_BUILDER(max_rx_thres);
755
756 static const char *dma_op_modes[] = {
757 "element", "threshold", "frame",
758 };
759
dma_op_mode_show(struct device * dev,struct device_attribute * attr,char * buf)760 static ssize_t dma_op_mode_show(struct device *dev,
761 struct device_attribute *attr, char *buf)
762 {
763 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
764 int dma_op_mode, i = 0;
765 ssize_t len = 0;
766 const char * const *s;
767
768 dma_op_mode = mcbsp->dma_op_mode;
769
770 for (s = &dma_op_modes[i]; i < ARRAY_SIZE(dma_op_modes); s++, i++) {
771 if (dma_op_mode == i)
772 len += sprintf(buf + len, "[%s] ", *s);
773 else
774 len += sprintf(buf + len, "%s ", *s);
775 }
776 len += sprintf(buf + len, "\n");
777
778 return len;
779 }
780
dma_op_mode_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)781 static ssize_t dma_op_mode_store(struct device *dev,
782 struct device_attribute *attr,
783 const char *buf, size_t size)
784 {
785 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
786 const char * const *s;
787 int i = 0;
788
789 for (s = &dma_op_modes[i]; i < ARRAY_SIZE(dma_op_modes); s++, i++)
790 if (sysfs_streq(buf, *s))
791 break;
792
793 if (i == ARRAY_SIZE(dma_op_modes))
794 return -EINVAL;
795
796 spin_lock_irq(&mcbsp->lock);
797 if (!mcbsp->free) {
798 size = -EBUSY;
799 goto unlock;
800 }
801 mcbsp->dma_op_mode = i;
802
803 unlock:
804 spin_unlock_irq(&mcbsp->lock);
805
806 return size;
807 }
808
809 static DEVICE_ATTR(dma_op_mode, 0644, dma_op_mode_show, dma_op_mode_store);
810
811 static const struct attribute *additional_attrs[] = {
812 &dev_attr_max_tx_thres.attr,
813 &dev_attr_max_rx_thres.attr,
814 &dev_attr_dma_op_mode.attr,
815 NULL,
816 };
817
818 static const struct attribute_group additional_attr_group = {
819 .attrs = (struct attribute **)additional_attrs,
820 };
821
st_taps_show(struct device * dev,struct device_attribute * attr,char * buf)822 static ssize_t st_taps_show(struct device *dev,
823 struct device_attribute *attr, char *buf)
824 {
825 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
826 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
827 ssize_t status = 0;
828 int i;
829
830 spin_lock_irq(&mcbsp->lock);
831 for (i = 0; i < st_data->nr_taps; i++)
832 status += sprintf(&buf[status], (i ? ", %d" : "%d"),
833 st_data->taps[i]);
834 if (i)
835 status += sprintf(&buf[status], "\n");
836 spin_unlock_irq(&mcbsp->lock);
837
838 return status;
839 }
840
st_taps_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)841 static ssize_t st_taps_store(struct device *dev,
842 struct device_attribute *attr,
843 const char *buf, size_t size)
844 {
845 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
846 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
847 int val, tmp, status, i = 0;
848
849 spin_lock_irq(&mcbsp->lock);
850 memset(st_data->taps, 0, sizeof(st_data->taps));
851 st_data->nr_taps = 0;
852
853 do {
854 status = sscanf(buf, "%d%n", &val, &tmp);
855 if (status < 0 || status == 0) {
856 size = -EINVAL;
857 goto out;
858 }
859 if (val < -32768 || val > 32767) {
860 size = -EINVAL;
861 goto out;
862 }
863 st_data->taps[i++] = val;
864 buf += tmp;
865 if (*buf != ',')
866 break;
867 buf++;
868 } while (1);
869
870 st_data->nr_taps = i;
871
872 out:
873 spin_unlock_irq(&mcbsp->lock);
874
875 return size;
876 }
877
878 static DEVICE_ATTR(st_taps, 0644, st_taps_show, st_taps_store);
879
880 static const struct attribute *sidetone_attrs[] = {
881 &dev_attr_st_taps.attr,
882 NULL,
883 };
884
885 static const struct attribute_group sidetone_attr_group = {
886 .attrs = (struct attribute **)sidetone_attrs,
887 };
888
omap_st_add(struct omap_mcbsp * mcbsp,struct resource * res)889 static int __devinit omap_st_add(struct omap_mcbsp *mcbsp,
890 struct resource *res)
891 {
892 struct omap_mcbsp_st_data *st_data;
893 int err;
894
895 st_data = devm_kzalloc(mcbsp->dev, sizeof(*mcbsp->st_data), GFP_KERNEL);
896 if (!st_data)
897 return -ENOMEM;
898
899 st_data->io_base_st = devm_ioremap(mcbsp->dev, res->start,
900 resource_size(res));
901 if (!st_data->io_base_st)
902 return -ENOMEM;
903
904 err = sysfs_create_group(&mcbsp->dev->kobj, &sidetone_attr_group);
905 if (err)
906 return err;
907
908 mcbsp->st_data = st_data;
909 return 0;
910 }
911
912 /*
913 * McBSP1 and McBSP3 are directly mapped on 1610 and 1510.
914 * 730 has only 2 McBSP, and both of them are MPU peripherals.
915 */
omap_mcbsp_init(struct platform_device * pdev)916 int __devinit omap_mcbsp_init(struct platform_device *pdev)
917 {
918 struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev);
919 struct resource *res;
920 int ret = 0;
921
922 spin_lock_init(&mcbsp->lock);
923 mcbsp->free = true;
924
925 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
926 if (!res) {
927 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
928 if (!res) {
929 dev_err(mcbsp->dev, "invalid memory resource\n");
930 return -ENOMEM;
931 }
932 }
933 if (!devm_request_mem_region(&pdev->dev, res->start, resource_size(res),
934 dev_name(&pdev->dev))) {
935 dev_err(mcbsp->dev, "memory region already claimed\n");
936 return -ENODEV;
937 }
938
939 mcbsp->phys_base = res->start;
940 mcbsp->reg_cache_size = resource_size(res);
941 mcbsp->io_base = devm_ioremap(&pdev->dev, res->start,
942 resource_size(res));
943 if (!mcbsp->io_base)
944 return -ENOMEM;
945
946 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
947 if (!res)
948 mcbsp->phys_dma_base = mcbsp->phys_base;
949 else
950 mcbsp->phys_dma_base = res->start;
951
952 mcbsp->tx_irq = platform_get_irq_byname(pdev, "tx");
953 mcbsp->rx_irq = platform_get_irq_byname(pdev, "rx");
954
955 /* From OMAP4 there will be a single irq line */
956 if (mcbsp->tx_irq == -ENXIO) {
957 mcbsp->tx_irq = platform_get_irq(pdev, 0);
958 mcbsp->rx_irq = 0;
959 }
960
961 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
962 if (!res) {
963 dev_err(&pdev->dev, "invalid rx DMA channel\n");
964 return -ENODEV;
965 }
966 /* RX DMA request number, and port address configuration */
967 mcbsp->dma_data[1].name = "Audio Capture";
968 mcbsp->dma_data[1].dma_req = res->start;
969 mcbsp->dma_data[1].port_addr = omap_mcbsp_dma_reg_params(mcbsp, 1);
970
971 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
972 if (!res) {
973 dev_err(&pdev->dev, "invalid tx DMA channel\n");
974 return -ENODEV;
975 }
976 /* TX DMA request number, and port address configuration */
977 mcbsp->dma_data[0].name = "Audio Playback";
978 mcbsp->dma_data[0].dma_req = res->start;
979 mcbsp->dma_data[0].port_addr = omap_mcbsp_dma_reg_params(mcbsp, 0);
980
981 mcbsp->fclk = clk_get(&pdev->dev, "fck");
982 if (IS_ERR(mcbsp->fclk)) {
983 ret = PTR_ERR(mcbsp->fclk);
984 dev_err(mcbsp->dev, "unable to get fck: %d\n", ret);
985 return ret;
986 }
987
988 mcbsp->dma_op_mode = MCBSP_DMA_MODE_ELEMENT;
989 if (mcbsp->pdata->buffer_size) {
990 /*
991 * Initially configure the maximum thresholds to a safe value.
992 * The McBSP FIFO usage with these values should not go under
993 * 16 locations.
994 * If the whole FIFO without safety buffer is used, than there
995 * is a possibility that the DMA will be not able to push the
996 * new data on time, causing channel shifts in runtime.
997 */
998 mcbsp->max_tx_thres = max_thres(mcbsp) - 0x10;
999 mcbsp->max_rx_thres = max_thres(mcbsp) - 0x10;
1000
1001 ret = sysfs_create_group(&mcbsp->dev->kobj,
1002 &additional_attr_group);
1003 if (ret) {
1004 dev_err(mcbsp->dev,
1005 "Unable to create additional controls\n");
1006 goto err_thres;
1007 }
1008 } else {
1009 mcbsp->max_tx_thres = -EINVAL;
1010 mcbsp->max_rx_thres = -EINVAL;
1011 }
1012
1013 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sidetone");
1014 if (res) {
1015 ret = omap_st_add(mcbsp, res);
1016 if (ret) {
1017 dev_err(mcbsp->dev,
1018 "Unable to create sidetone controls\n");
1019 goto err_st;
1020 }
1021 }
1022
1023 return 0;
1024
1025 err_st:
1026 if (mcbsp->pdata->buffer_size)
1027 sysfs_remove_group(&mcbsp->dev->kobj, &additional_attr_group);
1028 err_thres:
1029 clk_put(mcbsp->fclk);
1030 return ret;
1031 }
1032
omap_mcbsp_sysfs_remove(struct omap_mcbsp * mcbsp)1033 void __devexit omap_mcbsp_sysfs_remove(struct omap_mcbsp *mcbsp)
1034 {
1035 if (mcbsp->pdata->buffer_size)
1036 sysfs_remove_group(&mcbsp->dev->kobj, &additional_attr_group);
1037
1038 if (mcbsp->st_data)
1039 sysfs_remove_group(&mcbsp->dev->kobj, &sidetone_attr_group);
1040 }
1041