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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#include <linux/pm_runtime.h>
28
29#include <linux/platform_data/asoc-ti-mcbsp.h>
30
31#include "mcbsp.h"
32
33static void omap_mcbsp_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
34{
35 void __iomem *addr = mcbsp->io_base + reg * mcbsp->pdata->reg_step;
36
37 if (mcbsp->pdata->reg_size == 2) {
38 ((u16 *)mcbsp->reg_cache)[reg] = (u16)val;
39 writew_relaxed((u16)val, addr);
40 } else {
41 ((u32 *)mcbsp->reg_cache)[reg] = val;
42 writel_relaxed(val, addr);
43 }
44}
45
46static int omap_mcbsp_read(struct omap_mcbsp *mcbsp, u16 reg, bool from_cache)
47{
48 void __iomem *addr = mcbsp->io_base + reg * mcbsp->pdata->reg_step;
49
50 if (mcbsp->pdata->reg_size == 2) {
51 return !from_cache ? readw_relaxed(addr) :
52 ((u16 *)mcbsp->reg_cache)[reg];
53 } else {
54 return !from_cache ? readl_relaxed(addr) :
55 ((u32 *)mcbsp->reg_cache)[reg];
56 }
57}
58
59static void omap_mcbsp_st_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
60{
61 writel_relaxed(val, mcbsp->st_data->io_base_st + reg);
62}
63
64static int omap_mcbsp_st_read(struct omap_mcbsp *mcbsp, u16 reg)
65{
66 return readl_relaxed(mcbsp->st_data->io_base_st + reg);
67}
68
69#define MCBSP_READ(mcbsp, reg) \
70 omap_mcbsp_read(mcbsp, OMAP_MCBSP_REG_##reg, 0)
71#define MCBSP_WRITE(mcbsp, reg, val) \
72 omap_mcbsp_write(mcbsp, OMAP_MCBSP_REG_##reg, val)
73#define MCBSP_READ_CACHE(mcbsp, reg) \
74 omap_mcbsp_read(mcbsp, OMAP_MCBSP_REG_##reg, 1)
75
76#define MCBSP_ST_READ(mcbsp, reg) \
77 omap_mcbsp_st_read(mcbsp, OMAP_ST_REG_##reg)
78#define MCBSP_ST_WRITE(mcbsp, reg, val) \
79 omap_mcbsp_st_write(mcbsp, OMAP_ST_REG_##reg, val)
80
81static void omap_mcbsp_dump_reg(struct omap_mcbsp *mcbsp)
82{
83 dev_dbg(mcbsp->dev, "**** McBSP%d regs ****\n", mcbsp->id);
84 dev_dbg(mcbsp->dev, "DRR2: 0x%04x\n",
85 MCBSP_READ(mcbsp, DRR2));
86 dev_dbg(mcbsp->dev, "DRR1: 0x%04x\n",
87 MCBSP_READ(mcbsp, DRR1));
88 dev_dbg(mcbsp->dev, "DXR2: 0x%04x\n",
89 MCBSP_READ(mcbsp, DXR2));
90 dev_dbg(mcbsp->dev, "DXR1: 0x%04x\n",
91 MCBSP_READ(mcbsp, DXR1));
92 dev_dbg(mcbsp->dev, "SPCR2: 0x%04x\n",
93 MCBSP_READ(mcbsp, SPCR2));
94 dev_dbg(mcbsp->dev, "SPCR1: 0x%04x\n",
95 MCBSP_READ(mcbsp, SPCR1));
96 dev_dbg(mcbsp->dev, "RCR2: 0x%04x\n",
97 MCBSP_READ(mcbsp, RCR2));
98 dev_dbg(mcbsp->dev, "RCR1: 0x%04x\n",
99 MCBSP_READ(mcbsp, RCR1));
100 dev_dbg(mcbsp->dev, "XCR2: 0x%04x\n",
101 MCBSP_READ(mcbsp, XCR2));
102 dev_dbg(mcbsp->dev, "XCR1: 0x%04x\n",
103 MCBSP_READ(mcbsp, XCR1));
104 dev_dbg(mcbsp->dev, "SRGR2: 0x%04x\n",
105 MCBSP_READ(mcbsp, SRGR2));
106 dev_dbg(mcbsp->dev, "SRGR1: 0x%04x\n",
107 MCBSP_READ(mcbsp, SRGR1));
108 dev_dbg(mcbsp->dev, "PCR0: 0x%04x\n",
109 MCBSP_READ(mcbsp, PCR0));
110 dev_dbg(mcbsp->dev, "***********************\n");
111}
112
113static irqreturn_t omap_mcbsp_irq_handler(int irq, void *dev_id)
114{
115 struct omap_mcbsp *mcbsp = dev_id;
116 u16 irqst;
117
118 irqst = MCBSP_READ(mcbsp, IRQST);
119 dev_dbg(mcbsp->dev, "IRQ callback : 0x%x\n", irqst);
120
121 if (irqst & RSYNCERREN)
122 dev_err(mcbsp->dev, "RX Frame Sync Error!\n");
123 if (irqst & RFSREN)
124 dev_dbg(mcbsp->dev, "RX Frame Sync\n");
125 if (irqst & REOFEN)
126 dev_dbg(mcbsp->dev, "RX End Of Frame\n");
127 if (irqst & RRDYEN)
128 dev_dbg(mcbsp->dev, "RX Buffer Threshold Reached\n");
129 if (irqst & RUNDFLEN)
130 dev_err(mcbsp->dev, "RX Buffer Underflow!\n");
131 if (irqst & ROVFLEN)
132 dev_err(mcbsp->dev, "RX Buffer Overflow!\n");
133
134 if (irqst & XSYNCERREN)
135 dev_err(mcbsp->dev, "TX Frame Sync Error!\n");
136 if (irqst & XFSXEN)
137 dev_dbg(mcbsp->dev, "TX Frame Sync\n");
138 if (irqst & XEOFEN)
139 dev_dbg(mcbsp->dev, "TX End Of Frame\n");
140 if (irqst & XRDYEN)
141 dev_dbg(mcbsp->dev, "TX Buffer threshold Reached\n");
142 if (irqst & XUNDFLEN)
143 dev_err(mcbsp->dev, "TX Buffer Underflow!\n");
144 if (irqst & XOVFLEN)
145 dev_err(mcbsp->dev, "TX Buffer Overflow!\n");
146 if (irqst & XEMPTYEOFEN)
147 dev_dbg(mcbsp->dev, "TX Buffer empty at end of frame\n");
148
149 MCBSP_WRITE(mcbsp, IRQST, irqst);
150
151 return IRQ_HANDLED;
152}
153
154static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id)
155{
156 struct omap_mcbsp *mcbsp_tx = dev_id;
157 u16 irqst_spcr2;
158
159 irqst_spcr2 = MCBSP_READ(mcbsp_tx, SPCR2);
160 dev_dbg(mcbsp_tx->dev, "TX IRQ callback : 0x%x\n", irqst_spcr2);
161
162 if (irqst_spcr2 & XSYNC_ERR) {
163 dev_err(mcbsp_tx->dev, "TX Frame Sync Error! : 0x%x\n",
164 irqst_spcr2);
165 /* Writing zero to XSYNC_ERR clears the IRQ */
166 MCBSP_WRITE(mcbsp_tx, SPCR2, MCBSP_READ_CACHE(mcbsp_tx, SPCR2));
167 }
168
169 return IRQ_HANDLED;
170}
171
172static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id)
173{
174 struct omap_mcbsp *mcbsp_rx = dev_id;
175 u16 irqst_spcr1;
176
177 irqst_spcr1 = MCBSP_READ(mcbsp_rx, SPCR1);
178 dev_dbg(mcbsp_rx->dev, "RX IRQ callback : 0x%x\n", irqst_spcr1);
179
180 if (irqst_spcr1 & RSYNC_ERR) {
181 dev_err(mcbsp_rx->dev, "RX Frame Sync Error! : 0x%x\n",
182 irqst_spcr1);
183 /* Writing zero to RSYNC_ERR clears the IRQ */
184 MCBSP_WRITE(mcbsp_rx, SPCR1, MCBSP_READ_CACHE(mcbsp_rx, SPCR1));
185 }
186
187 return IRQ_HANDLED;
188}
189
190/*
191 * omap_mcbsp_config simply write a config to the
192 * appropriate McBSP.
193 * You either call this function or set the McBSP registers
194 * by yourself before calling omap_mcbsp_start().
195 */
196void omap_mcbsp_config(struct omap_mcbsp *mcbsp,
197 const struct omap_mcbsp_reg_cfg *config)
198{
199 dev_dbg(mcbsp->dev, "Configuring McBSP%d phys_base: 0x%08lx\n",
200 mcbsp->id, mcbsp->phys_base);
201
202 /* We write the given config */
203 MCBSP_WRITE(mcbsp, SPCR2, config->spcr2);
204 MCBSP_WRITE(mcbsp, SPCR1, config->spcr1);
205 MCBSP_WRITE(mcbsp, RCR2, config->rcr2);
206 MCBSP_WRITE(mcbsp, RCR1, config->rcr1);
207 MCBSP_WRITE(mcbsp, XCR2, config->xcr2);
208 MCBSP_WRITE(mcbsp, XCR1, config->xcr1);
209 MCBSP_WRITE(mcbsp, SRGR2, config->srgr2);
210 MCBSP_WRITE(mcbsp, SRGR1, config->srgr1);
211 MCBSP_WRITE(mcbsp, MCR2, config->mcr2);
212 MCBSP_WRITE(mcbsp, MCR1, config->mcr1);
213 MCBSP_WRITE(mcbsp, PCR0, config->pcr0);
214 if (mcbsp->pdata->has_ccr) {
215 MCBSP_WRITE(mcbsp, XCCR, config->xccr);
216 MCBSP_WRITE(mcbsp, RCCR, config->rccr);
217 }
218 /* Enable wakeup behavior */
219 if (mcbsp->pdata->has_wakeup)
220 MCBSP_WRITE(mcbsp, WAKEUPEN, XRDYEN | RRDYEN);
221
222 /* Enable TX/RX sync error interrupts by default */
223 if (mcbsp->irq)
224 MCBSP_WRITE(mcbsp, IRQEN, RSYNCERREN | XSYNCERREN |
225 RUNDFLEN | ROVFLEN | XUNDFLEN | XOVFLEN);
226}
227
228/**
229 * omap_mcbsp_dma_reg_params - returns the address of mcbsp data register
230 * @id - mcbsp id
231 * @stream - indicates the direction of data flow (rx or tx)
232 *
233 * Returns the address of mcbsp data transmit register or data receive register
234 * to be used by DMA for transferring/receiving data based on the value of
235 * @stream for the requested mcbsp given by @id
236 */
237static int omap_mcbsp_dma_reg_params(struct omap_mcbsp *mcbsp,
238 unsigned int stream)
239{
240 int data_reg;
241
242 if (mcbsp->pdata->reg_size == 2) {
243 if (stream)
244 data_reg = OMAP_MCBSP_REG_DRR1;
245 else
246 data_reg = OMAP_MCBSP_REG_DXR1;
247 } else {
248 if (stream)
249 data_reg = OMAP_MCBSP_REG_DRR;
250 else
251 data_reg = OMAP_MCBSP_REG_DXR;
252 }
253
254 return mcbsp->phys_dma_base + data_reg * mcbsp->pdata->reg_step;
255}
256
257static void omap_st_on(struct omap_mcbsp *mcbsp)
258{
259 unsigned int w;
260
261 if (mcbsp->pdata->force_ick_on)
262 mcbsp->pdata->force_ick_on(mcbsp->st_data->mcbsp_iclk, true);
263
264 /* Disable Sidetone clock auto-gating for normal operation */
265 w = MCBSP_ST_READ(mcbsp, SYSCONFIG);
266 MCBSP_ST_WRITE(mcbsp, SYSCONFIG, w & ~(ST_AUTOIDLE));
267
268 /* Enable McBSP Sidetone */
269 w = MCBSP_READ(mcbsp, SSELCR);
270 MCBSP_WRITE(mcbsp, SSELCR, w | SIDETONEEN);
271
272 /* Enable Sidetone from Sidetone Core */
273 w = MCBSP_ST_READ(mcbsp, SSELCR);
274 MCBSP_ST_WRITE(mcbsp, SSELCR, w | ST_SIDETONEEN);
275}
276
277static void omap_st_off(struct omap_mcbsp *mcbsp)
278{
279 unsigned int w;
280
281 w = MCBSP_ST_READ(mcbsp, SSELCR);
282 MCBSP_ST_WRITE(mcbsp, SSELCR, w & ~(ST_SIDETONEEN));
283
284 w = MCBSP_READ(mcbsp, SSELCR);
285 MCBSP_WRITE(mcbsp, SSELCR, w & ~(SIDETONEEN));
286
287 /* Enable Sidetone clock auto-gating to reduce power consumption */
288 w = MCBSP_ST_READ(mcbsp, SYSCONFIG);
289 MCBSP_ST_WRITE(mcbsp, SYSCONFIG, w | ST_AUTOIDLE);
290
291 if (mcbsp->pdata->force_ick_on)
292 mcbsp->pdata->force_ick_on(mcbsp->st_data->mcbsp_iclk, false);
293}
294
295static void omap_st_fir_write(struct omap_mcbsp *mcbsp, s16 *fir)
296{
297 u16 val, i;
298
299 val = MCBSP_ST_READ(mcbsp, SSELCR);
300
301 if (val & ST_COEFFWREN)
302 MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
303
304 MCBSP_ST_WRITE(mcbsp, SSELCR, val | ST_COEFFWREN);
305
306 for (i = 0; i < 128; i++)
307 MCBSP_ST_WRITE(mcbsp, SFIRCR, fir[i]);
308
309 i = 0;
310
311 val = MCBSP_ST_READ(mcbsp, SSELCR);
312 while (!(val & ST_COEFFWRDONE) && (++i < 1000))
313 val = MCBSP_ST_READ(mcbsp, SSELCR);
314
315 MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
316
317 if (i == 1000)
318 dev_err(mcbsp->dev, "McBSP FIR load error!\n");
319}
320
321static void omap_st_chgain(struct omap_mcbsp *mcbsp)
322{
323 u16 w;
324 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
325
326 w = MCBSP_ST_READ(mcbsp, SSELCR);
327
328 MCBSP_ST_WRITE(mcbsp, SGAINCR, ST_CH0GAIN(st_data->ch0gain) | \
329 ST_CH1GAIN(st_data->ch1gain));
330}
331
332int omap_st_set_chgain(struct omap_mcbsp *mcbsp, int channel, s16 chgain)
333{
334 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
335 int ret = 0;
336
337 if (!st_data)
338 return -ENOENT;
339
340 spin_lock_irq(&mcbsp->lock);
341 if (channel == 0)
342 st_data->ch0gain = chgain;
343 else if (channel == 1)
344 st_data->ch1gain = chgain;
345 else
346 ret = -EINVAL;
347
348 if (st_data->enabled)
349 omap_st_chgain(mcbsp);
350 spin_unlock_irq(&mcbsp->lock);
351
352 return ret;
353}
354
355int omap_st_get_chgain(struct omap_mcbsp *mcbsp, int channel, s16 *chgain)
356{
357 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
358 int ret = 0;
359
360 if (!st_data)
361 return -ENOENT;
362
363 spin_lock_irq(&mcbsp->lock);
364 if (channel == 0)
365 *chgain = st_data->ch0gain;
366 else if (channel == 1)
367 *chgain = st_data->ch1gain;
368 else
369 ret = -EINVAL;
370 spin_unlock_irq(&mcbsp->lock);
371
372 return ret;
373}
374
375static int omap_st_start(struct omap_mcbsp *mcbsp)
376{
377 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
378
379 if (st_data->enabled && !st_data->running) {
380 omap_st_fir_write(mcbsp, st_data->taps);
381 omap_st_chgain(mcbsp);
382
383 if (!mcbsp->free) {
384 omap_st_on(mcbsp);
385 st_data->running = 1;
386 }
387 }
388
389 return 0;
390}
391
392int omap_st_enable(struct omap_mcbsp *mcbsp)
393{
394 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
395
396 if (!st_data)
397 return -ENODEV;
398
399 spin_lock_irq(&mcbsp->lock);
400 st_data->enabled = 1;
401 omap_st_start(mcbsp);
402 spin_unlock_irq(&mcbsp->lock);
403
404 return 0;
405}
406
407static int omap_st_stop(struct omap_mcbsp *mcbsp)
408{
409 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
410
411 if (st_data->running) {
412 if (!mcbsp->free) {
413 omap_st_off(mcbsp);
414 st_data->running = 0;
415 }
416 }
417
418 return 0;
419}
420
421int omap_st_disable(struct omap_mcbsp *mcbsp)
422{
423 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
424 int ret = 0;
425
426 if (!st_data)
427 return -ENODEV;
428
429 spin_lock_irq(&mcbsp->lock);
430 omap_st_stop(mcbsp);
431 st_data->enabled = 0;
432 spin_unlock_irq(&mcbsp->lock);
433
434 return ret;
435}
436
437int omap_st_is_enabled(struct omap_mcbsp *mcbsp)
438{
439 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
440
441 if (!st_data)
442 return -ENODEV;
443
444 return st_data->enabled;
445}
446
447/*
448 * omap_mcbsp_set_rx_threshold configures the transmit threshold in words.
449 * The threshold parameter is 1 based, and it is converted (threshold - 1)
450 * for the THRSH2 register.
451 */
452void omap_mcbsp_set_tx_threshold(struct omap_mcbsp *mcbsp, u16 threshold)
453{
454 if (mcbsp->pdata->buffer_size == 0)
455 return;
456
457 if (threshold && threshold <= mcbsp->max_tx_thres)
458 MCBSP_WRITE(mcbsp, THRSH2, threshold - 1);
459}
460
461/*
462 * omap_mcbsp_set_rx_threshold configures the receive threshold in words.
463 * The threshold parameter is 1 based, and it is converted (threshold - 1)
464 * for the THRSH1 register.
465 */
466void omap_mcbsp_set_rx_threshold(struct omap_mcbsp *mcbsp, u16 threshold)
467{
468 if (mcbsp->pdata->buffer_size == 0)
469 return;
470
471 if (threshold && threshold <= mcbsp->max_rx_thres)
472 MCBSP_WRITE(mcbsp, THRSH1, threshold - 1);
473}
474
475/*
476 * omap_mcbsp_get_tx_delay returns the number of used slots in the McBSP FIFO
477 */
478u16 omap_mcbsp_get_tx_delay(struct omap_mcbsp *mcbsp)
479{
480 u16 buffstat;
481
482 if (mcbsp->pdata->buffer_size == 0)
483 return 0;
484
485 /* Returns the number of free locations in the buffer */
486 buffstat = MCBSP_READ(mcbsp, XBUFFSTAT);
487
488 /* Number of slots are different in McBSP ports */
489 return mcbsp->pdata->buffer_size - buffstat;
490}
491
492/*
493 * omap_mcbsp_get_rx_delay returns the number of free slots in the McBSP FIFO
494 * to reach the threshold value (when the DMA will be triggered to read it)
495 */
496u16 omap_mcbsp_get_rx_delay(struct omap_mcbsp *mcbsp)
497{
498 u16 buffstat, threshold;
499
500 if (mcbsp->pdata->buffer_size == 0)
501 return 0;
502
503 /* Returns the number of used locations in the buffer */
504 buffstat = MCBSP_READ(mcbsp, RBUFFSTAT);
505 /* RX threshold */
506 threshold = MCBSP_READ(mcbsp, THRSH1);
507
508 /* Return the number of location till we reach the threshold limit */
509 if (threshold <= buffstat)
510 return 0;
511 else
512 return threshold - buffstat;
513}
514
515int omap_mcbsp_request(struct omap_mcbsp *mcbsp)
516{
517 void *reg_cache;
518 int err;
519
520 reg_cache = kzalloc(mcbsp->reg_cache_size, GFP_KERNEL);
521 if (!reg_cache) {
522 return -ENOMEM;
523 }
524
525 spin_lock(&mcbsp->lock);
526 if (!mcbsp->free) {
527 dev_err(mcbsp->dev, "McBSP%d is currently in use\n",
528 mcbsp->id);
529 err = -EBUSY;
530 goto err_kfree;
531 }
532
533 mcbsp->free = false;
534 mcbsp->reg_cache = reg_cache;
535 spin_unlock(&mcbsp->lock);
536
537 if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->request)
538 mcbsp->pdata->ops->request(mcbsp->id - 1);
539
540 /*
541 * Make sure that transmitter, receiver and sample-rate generator are
542 * not running before activating IRQs.
543 */
544 MCBSP_WRITE(mcbsp, SPCR1, 0);
545 MCBSP_WRITE(mcbsp, SPCR2, 0);
546
547 if (mcbsp->irq) {
548 err = request_irq(mcbsp->irq, omap_mcbsp_irq_handler, 0,
549 "McBSP", (void *)mcbsp);
550 if (err != 0) {
551 dev_err(mcbsp->dev, "Unable to request IRQ\n");
552 goto err_clk_disable;
553 }
554 } else {
555 err = request_irq(mcbsp->tx_irq, omap_mcbsp_tx_irq_handler, 0,
556 "McBSP TX", (void *)mcbsp);
557 if (err != 0) {
558 dev_err(mcbsp->dev, "Unable to request TX IRQ\n");
559 goto err_clk_disable;
560 }
561
562 err = request_irq(mcbsp->rx_irq, omap_mcbsp_rx_irq_handler, 0,
563 "McBSP RX", (void *)mcbsp);
564 if (err != 0) {
565 dev_err(mcbsp->dev, "Unable to request RX IRQ\n");
566 goto err_free_irq;
567 }
568 }
569
570 return 0;
571err_free_irq:
572 free_irq(mcbsp->tx_irq, (void *)mcbsp);
573err_clk_disable:
574 if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
575 mcbsp->pdata->ops->free(mcbsp->id - 1);
576
577 /* Disable wakeup behavior */
578 if (mcbsp->pdata->has_wakeup)
579 MCBSP_WRITE(mcbsp, WAKEUPEN, 0);
580
581 spin_lock(&mcbsp->lock);
582 mcbsp->free = true;
583 mcbsp->reg_cache = NULL;
584err_kfree:
585 spin_unlock(&mcbsp->lock);
586 kfree(reg_cache);
587
588 return err;
589}
590
591void omap_mcbsp_free(struct omap_mcbsp *mcbsp)
592{
593 void *reg_cache;
594
595 if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
596 mcbsp->pdata->ops->free(mcbsp->id - 1);
597
598 /* Disable wakeup behavior */
599 if (mcbsp->pdata->has_wakeup)
600 MCBSP_WRITE(mcbsp, WAKEUPEN, 0);
601
602 /* Disable interrupt requests */
603 if (mcbsp->irq)
604 MCBSP_WRITE(mcbsp, IRQEN, 0);
605
606 if (mcbsp->irq) {
607 free_irq(mcbsp->irq, (void *)mcbsp);
608 } else {
609 free_irq(mcbsp->rx_irq, (void *)mcbsp);
610 free_irq(mcbsp->tx_irq, (void *)mcbsp);
611 }
612
613 reg_cache = mcbsp->reg_cache;
614
615 /*
616 * Select CLKS source from internal source unconditionally before
617 * marking the McBSP port as free.
618 * If the external clock source via MCBSP_CLKS pin has been selected the
619 * system will refuse to enter idle if the CLKS pin source is not reset
620 * back to internal source.
621 */
622 if (!mcbsp_omap1())
623 omap2_mcbsp_set_clks_src(mcbsp, MCBSP_CLKS_PRCM_SRC);
624
625 spin_lock(&mcbsp->lock);
626 if (mcbsp->free)
627 dev_err(mcbsp->dev, "McBSP%d was not reserved\n", mcbsp->id);
628 else
629 mcbsp->free = true;
630 mcbsp->reg_cache = NULL;
631 spin_unlock(&mcbsp->lock);
632
633 kfree(reg_cache);
634}
635
636/*
637 * Here we start the McBSP, by enabling transmitter, receiver or both.
638 * If no transmitter or receiver is active prior calling, then sample-rate
639 * generator and frame sync are started.
640 */
641void omap_mcbsp_start(struct omap_mcbsp *mcbsp, int tx, int rx)
642{
643 int enable_srg = 0;
644 u16 w;
645
646 if (mcbsp->st_data)
647 omap_st_start(mcbsp);
648
649 /* Only enable SRG, if McBSP is master */
650 w = MCBSP_READ_CACHE(mcbsp, PCR0);
651 if (w & (FSXM | FSRM | CLKXM | CLKRM))
652 enable_srg = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
653 MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
654
655 if (enable_srg) {
656 /* Start the sample generator */
657 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
658 MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 6));
659 }
660
661 /* Enable transmitter and receiver */
662 tx &= 1;
663 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
664 MCBSP_WRITE(mcbsp, SPCR2, w | tx);
665
666 rx &= 1;
667 w = MCBSP_READ_CACHE(mcbsp, SPCR1);
668 MCBSP_WRITE(mcbsp, SPCR1, w | rx);
669
670 /*
671 * Worst case: CLKSRG*2 = 8000khz: (1/8000) * 2 * 2 usec
672 * REVISIT: 100us may give enough time for two CLKSRG, however
673 * due to some unknown PM related, clock gating etc. reason it
674 * is now at 500us.
675 */
676 udelay(500);
677
678 if (enable_srg) {
679 /* Start frame sync */
680 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
681 MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 7));
682 }
683
684 if (mcbsp->pdata->has_ccr) {
685 /* Release the transmitter and receiver */
686 w = MCBSP_READ_CACHE(mcbsp, XCCR);
687 w &= ~(tx ? XDISABLE : 0);
688 MCBSP_WRITE(mcbsp, XCCR, w);
689 w = MCBSP_READ_CACHE(mcbsp, RCCR);
690 w &= ~(rx ? RDISABLE : 0);
691 MCBSP_WRITE(mcbsp, RCCR, w);
692 }
693
694 /* Dump McBSP Regs */
695 omap_mcbsp_dump_reg(mcbsp);
696}
697
698void omap_mcbsp_stop(struct omap_mcbsp *mcbsp, int tx, int rx)
699{
700 int idle;
701 u16 w;
702
703 /* Reset transmitter */
704 tx &= 1;
705 if (mcbsp->pdata->has_ccr) {
706 w = MCBSP_READ_CACHE(mcbsp, XCCR);
707 w |= (tx ? XDISABLE : 0);
708 MCBSP_WRITE(mcbsp, XCCR, w);
709 }
710 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
711 MCBSP_WRITE(mcbsp, SPCR2, w & ~tx);
712
713 /* Reset receiver */
714 rx &= 1;
715 if (mcbsp->pdata->has_ccr) {
716 w = MCBSP_READ_CACHE(mcbsp, RCCR);
717 w |= (rx ? RDISABLE : 0);
718 MCBSP_WRITE(mcbsp, RCCR, w);
719 }
720 w = MCBSP_READ_CACHE(mcbsp, SPCR1);
721 MCBSP_WRITE(mcbsp, SPCR1, w & ~rx);
722
723 idle = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
724 MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
725
726 if (idle) {
727 /* Reset the sample rate generator */
728 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
729 MCBSP_WRITE(mcbsp, SPCR2, w & ~(1 << 6));
730 }
731
732 if (mcbsp->st_data)
733 omap_st_stop(mcbsp);
734}
735
736int omap2_mcbsp_set_clks_src(struct omap_mcbsp *mcbsp, u8 fck_src_id)
737{
738 struct clk *fck_src;
739 const char *src;
740 int r;
741
742 if (fck_src_id == MCBSP_CLKS_PAD_SRC)
743 src = "pad_fck";
744 else if (fck_src_id == MCBSP_CLKS_PRCM_SRC)
745 src = "prcm_fck";
746 else
747 return -EINVAL;
748
749 fck_src = clk_get(mcbsp->dev, src);
750 if (IS_ERR(fck_src)) {
751 dev_err(mcbsp->dev, "CLKS: could not clk_get() %s\n", src);
752 return -EINVAL;
753 }
754
755 pm_runtime_put_sync(mcbsp->dev);
756
757 r = clk_set_parent(mcbsp->fclk, fck_src);
758 if (r) {
759 dev_err(mcbsp->dev, "CLKS: could not clk_set_parent() to %s\n",
760 src);
761 clk_put(fck_src);
762 return r;
763 }
764
765 pm_runtime_get_sync(mcbsp->dev);
766
767 clk_put(fck_src);
768
769 return 0;
770
771}
772
773#define max_thres(m) (mcbsp->pdata->buffer_size)
774#define valid_threshold(m, val) ((val) <= max_thres(m))
775#define THRESHOLD_PROP_BUILDER(prop) \
776static ssize_t prop##_show(struct device *dev, \
777 struct device_attribute *attr, char *buf) \
778{ \
779 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev); \
780 \
781 return sprintf(buf, "%u\n", mcbsp->prop); \
782} \
783 \
784static ssize_t prop##_store(struct device *dev, \
785 struct device_attribute *attr, \
786 const char *buf, size_t size) \
787{ \
788 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev); \
789 unsigned long val; \
790 int status; \
791 \
792 status = kstrtoul(buf, 0, &val); \
793 if (status) \
794 return status; \
795 \
796 if (!valid_threshold(mcbsp, val)) \
797 return -EDOM; \
798 \
799 mcbsp->prop = val; \
800 return size; \
801} \
802 \
803static DEVICE_ATTR(prop, 0644, prop##_show, prop##_store);
804
805THRESHOLD_PROP_BUILDER(max_tx_thres);
806THRESHOLD_PROP_BUILDER(max_rx_thres);
807
808static const char *dma_op_modes[] = {
809 "element", "threshold",
810};
811
812static ssize_t dma_op_mode_show(struct device *dev,
813 struct device_attribute *attr, char *buf)
814{
815 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
816 int dma_op_mode, i = 0;
817 ssize_t len = 0;
818 const char * const *s;
819
820 dma_op_mode = mcbsp->dma_op_mode;
821
822 for (s = &dma_op_modes[i]; i < ARRAY_SIZE(dma_op_modes); s++, i++) {
823 if (dma_op_mode == i)
824 len += sprintf(buf + len, "[%s] ", *s);
825 else
826 len += sprintf(buf + len, "%s ", *s);
827 }
828 len += sprintf(buf + len, "\n");
829
830 return len;
831}
832
833static ssize_t dma_op_mode_store(struct device *dev,
834 struct device_attribute *attr,
835 const char *buf, size_t size)
836{
837 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
838 const char * const *s;
839 int i = 0;
840
841 for (s = &dma_op_modes[i]; i < ARRAY_SIZE(dma_op_modes); s++, i++)
842 if (sysfs_streq(buf, *s))
843 break;
844
845 if (i == ARRAY_SIZE(dma_op_modes))
846 return -EINVAL;
847
848 spin_lock_irq(&mcbsp->lock);
849 if (!mcbsp->free) {
850 size = -EBUSY;
851 goto unlock;
852 }
853 mcbsp->dma_op_mode = i;
854
855unlock:
856 spin_unlock_irq(&mcbsp->lock);
857
858 return size;
859}
860
861static DEVICE_ATTR(dma_op_mode, 0644, dma_op_mode_show, dma_op_mode_store);
862
863static const struct attribute *additional_attrs[] = {
864 &dev_attr_max_tx_thres.attr,
865 &dev_attr_max_rx_thres.attr,
866 &dev_attr_dma_op_mode.attr,
867 NULL,
868};
869
870static const struct attribute_group additional_attr_group = {
871 .attrs = (struct attribute **)additional_attrs,
872};
873
874static ssize_t st_taps_show(struct device *dev,
875 struct device_attribute *attr, char *buf)
876{
877 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
878 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
879 ssize_t status = 0;
880 int i;
881
882 spin_lock_irq(&mcbsp->lock);
883 for (i = 0; i < st_data->nr_taps; i++)
884 status += sprintf(&buf[status], (i ? ", %d" : "%d"),
885 st_data->taps[i]);
886 if (i)
887 status += sprintf(&buf[status], "\n");
888 spin_unlock_irq(&mcbsp->lock);
889
890 return status;
891}
892
893static ssize_t st_taps_store(struct device *dev,
894 struct device_attribute *attr,
895 const char *buf, size_t size)
896{
897 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
898 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
899 int val, tmp, status, i = 0;
900
901 spin_lock_irq(&mcbsp->lock);
902 memset(st_data->taps, 0, sizeof(st_data->taps));
903 st_data->nr_taps = 0;
904
905 do {
906 status = sscanf(buf, "%d%n", &val, &tmp);
907 if (status < 0 || status == 0) {
908 size = -EINVAL;
909 goto out;
910 }
911 if (val < -32768 || val > 32767) {
912 size = -EINVAL;
913 goto out;
914 }
915 st_data->taps[i++] = val;
916 buf += tmp;
917 if (*buf != ',')
918 break;
919 buf++;
920 } while (1);
921
922 st_data->nr_taps = i;
923
924out:
925 spin_unlock_irq(&mcbsp->lock);
926
927 return size;
928}
929
930static DEVICE_ATTR(st_taps, 0644, st_taps_show, st_taps_store);
931
932static const struct attribute *sidetone_attrs[] = {
933 &dev_attr_st_taps.attr,
934 NULL,
935};
936
937static const struct attribute_group sidetone_attr_group = {
938 .attrs = (struct attribute **)sidetone_attrs,
939};
940
941static int omap_st_add(struct omap_mcbsp *mcbsp, struct resource *res)
942{
943 struct omap_mcbsp_st_data *st_data;
944 int err;
945
946 st_data = devm_kzalloc(mcbsp->dev, sizeof(*mcbsp->st_data), GFP_KERNEL);
947 if (!st_data)
948 return -ENOMEM;
949
950 st_data->mcbsp_iclk = clk_get(mcbsp->dev, "ick");
951 if (IS_ERR(st_data->mcbsp_iclk)) {
952 dev_warn(mcbsp->dev,
953 "Failed to get ick, sidetone might be broken\n");
954 st_data->mcbsp_iclk = NULL;
955 }
956
957 st_data->io_base_st = devm_ioremap(mcbsp->dev, res->start,
958 resource_size(res));
959 if (!st_data->io_base_st)
960 return -ENOMEM;
961
962 err = sysfs_create_group(&mcbsp->dev->kobj, &sidetone_attr_group);
963 if (err)
964 return err;
965
966 mcbsp->st_data = st_data;
967 return 0;
968}
969
970/*
971 * McBSP1 and McBSP3 are directly mapped on 1610 and 1510.
972 * 730 has only 2 McBSP, and both of them are MPU peripherals.
973 */
974int omap_mcbsp_init(struct platform_device *pdev)
975{
976 struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev);
977 struct resource *res;
978 int ret = 0;
979
980 spin_lock_init(&mcbsp->lock);
981 mcbsp->free = true;
982
983 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
984 if (!res)
985 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
986
987 mcbsp->io_base = devm_ioremap_resource(&pdev->dev, res);
988 if (IS_ERR(mcbsp->io_base))
989 return PTR_ERR(mcbsp->io_base);
990
991 mcbsp->phys_base = res->start;
992 mcbsp->reg_cache_size = resource_size(res);
993
994 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
995 if (!res)
996 mcbsp->phys_dma_base = mcbsp->phys_base;
997 else
998 mcbsp->phys_dma_base = res->start;
999
1000 /*
1001 * OMAP1, 2 uses two interrupt lines: TX, RX
1002 * OMAP2430, OMAP3 SoC have combined IRQ line as well.
1003 * OMAP4 and newer SoC only have the combined IRQ line.
1004 * Use the combined IRQ if available since it gives better debugging
1005 * possibilities.
1006 */
1007 mcbsp->irq = platform_get_irq_byname(pdev, "common");
1008 if (mcbsp->irq == -ENXIO) {
1009 mcbsp->tx_irq = platform_get_irq_byname(pdev, "tx");
1010
1011 if (mcbsp->tx_irq == -ENXIO) {
1012 mcbsp->irq = platform_get_irq(pdev, 0);
1013 mcbsp->tx_irq = 0;
1014 } else {
1015 mcbsp->rx_irq = platform_get_irq_byname(pdev, "rx");
1016 mcbsp->irq = 0;
1017 }
1018 }
1019
1020 if (!pdev->dev.of_node) {
1021 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
1022 if (!res) {
1023 dev_err(&pdev->dev, "invalid tx DMA channel\n");
1024 return -ENODEV;
1025 }
1026 mcbsp->dma_req[0] = res->start;
1027 mcbsp->dma_data[0].filter_data = &mcbsp->dma_req[0];
1028
1029 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
1030 if (!res) {
1031 dev_err(&pdev->dev, "invalid rx DMA channel\n");
1032 return -ENODEV;
1033 }
1034 mcbsp->dma_req[1] = res->start;
1035 mcbsp->dma_data[1].filter_data = &mcbsp->dma_req[1];
1036 } else {
1037 mcbsp->dma_data[0].filter_data = "tx";
1038 mcbsp->dma_data[1].filter_data = "rx";
1039 }
1040
1041 mcbsp->dma_data[0].addr = omap_mcbsp_dma_reg_params(mcbsp, 0);
1042 mcbsp->dma_data[0].maxburst = 4;
1043
1044 mcbsp->dma_data[1].addr = omap_mcbsp_dma_reg_params(mcbsp, 1);
1045 mcbsp->dma_data[1].maxburst = 4;
1046
1047 mcbsp->fclk = clk_get(&pdev->dev, "fck");
1048 if (IS_ERR(mcbsp->fclk)) {
1049 ret = PTR_ERR(mcbsp->fclk);
1050 dev_err(mcbsp->dev, "unable to get fck: %d\n", ret);
1051 return ret;
1052 }
1053
1054 mcbsp->dma_op_mode = MCBSP_DMA_MODE_ELEMENT;
1055 if (mcbsp->pdata->buffer_size) {
1056 /*
1057 * Initially configure the maximum thresholds to a safe value.
1058 * The McBSP FIFO usage with these values should not go under
1059 * 16 locations.
1060 * If the whole FIFO without safety buffer is used, than there
1061 * is a possibility that the DMA will be not able to push the
1062 * new data on time, causing channel shifts in runtime.
1063 */
1064 mcbsp->max_tx_thres = max_thres(mcbsp) - 0x10;
1065 mcbsp->max_rx_thres = max_thres(mcbsp) - 0x10;
1066
1067 ret = sysfs_create_group(&mcbsp->dev->kobj,
1068 &additional_attr_group);
1069 if (ret) {
1070 dev_err(mcbsp->dev,
1071 "Unable to create additional controls\n");
1072 goto err_thres;
1073 }
1074 } else {
1075 mcbsp->max_tx_thres = -EINVAL;
1076 mcbsp->max_rx_thres = -EINVAL;
1077 }
1078
1079 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sidetone");
1080 if (res) {
1081 ret = omap_st_add(mcbsp, res);
1082 if (ret) {
1083 dev_err(mcbsp->dev,
1084 "Unable to create sidetone controls\n");
1085 goto err_st;
1086 }
1087 }
1088
1089 return 0;
1090
1091err_st:
1092 if (mcbsp->pdata->buffer_size)
1093 sysfs_remove_group(&mcbsp->dev->kobj, &additional_attr_group);
1094err_thres:
1095 clk_put(mcbsp->fclk);
1096 return ret;
1097}
1098
1099void omap_mcbsp_cleanup(struct omap_mcbsp *mcbsp)
1100{
1101 if (mcbsp->pdata->buffer_size)
1102 sysfs_remove_group(&mcbsp->dev->kobj, &additional_attr_group);
1103
1104 if (mcbsp->st_data) {
1105 sysfs_remove_group(&mcbsp->dev->kobj, &sidetone_attr_group);
1106 clk_put(mcbsp->st_data->mcbsp_iclk);
1107 }
1108}