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Sascha Hauer83802222009-11-25 16:41:04 +01001/*
2 * imx-pcm-fiq.c -- ALSA Soc Audio Layer
3 *
4 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
5 *
6 * This code is based on code copyrighted by Freescale,
7 * Liam Girdwood, Javier Martin and probably others.
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 */
14#include <linux/clk.h>
15#include <linux/delay.h>
16#include <linux/device.h>
17#include <linux/dma-mapping.h>
18#include <linux/init.h>
19#include <linux/interrupt.h>
20#include <linux/module.h>
21#include <linux/platform_device.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Sascha Hauer83802222009-11-25 16:41:04 +010023
24#include <sound/core.h>
25#include <sound/initval.h>
26#include <sound/pcm.h>
27#include <sound/pcm_params.h>
28#include <sound/soc.h>
29
30#include <asm/fiq.h>
31
Arnd Bergmann82906b12012-08-24 15:14:29 +020032#include <linux/platform_data/asoc-imx-ssi.h>
Sascha Hauer83802222009-11-25 16:41:04 +010033
34#include "imx-ssi.h"
35
36struct imx_pcm_runtime_data {
Fabio Estevam2fb14882013-03-20 02:22:40 -030037 unsigned int period;
Sascha Hauer83802222009-11-25 16:41:04 +010038 int periods;
Sascha Hauer83802222009-11-25 16:41:04 +010039 unsigned long offset;
Mark Brownb4e82b52010-02-25 12:52:10 +000040 unsigned long last_offset;
Sascha Hauer83802222009-11-25 16:41:04 +010041 unsigned long size;
Sascha Hauer43a3cec2010-04-08 11:31:26 +020042 struct hrtimer hrt;
43 int poll_time_ns;
44 struct snd_pcm_substream *substream;
Sascha Hauer83926092010-04-14 09:17:30 +020045 atomic_t running;
Sascha Hauer83802222009-11-25 16:41:04 +010046};
47
Sascha Hauer43a3cec2010-04-08 11:31:26 +020048static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
Mark Brownb4e82b52010-02-25 12:52:10 +000049{
Sascha Hauer43a3cec2010-04-08 11:31:26 +020050 struct imx_pcm_runtime_data *iprtd =
51 container_of(hrt, struct imx_pcm_runtime_data, hrt);
52 struct snd_pcm_substream *substream = iprtd->substream;
Sascha Hauer83802222009-11-25 16:41:04 +010053 struct snd_pcm_runtime *runtime = substream->runtime;
Sascha Hauer83802222009-11-25 16:41:04 +010054 struct pt_regs regs;
Mark Brownb4e82b52010-02-25 12:52:10 +000055 unsigned long delta;
Sascha Hauer83802222009-11-25 16:41:04 +010056
Sascha Hauer83926092010-04-14 09:17:30 +020057 if (!atomic_read(&iprtd->running))
58 return HRTIMER_NORESTART;
59
Sascha Hauer83802222009-11-25 16:41:04 +010060 get_fiq_regs(&regs);
61
62 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
63 iprtd->offset = regs.ARM_r8 & 0xffff;
64 else
65 iprtd->offset = regs.ARM_r9 & 0xffff;
66
Mark Brownb4e82b52010-02-25 12:52:10 +000067 /* How much data have we transferred since the last period report? */
68 if (iprtd->offset >= iprtd->last_offset)
69 delta = iprtd->offset - iprtd->last_offset;
70 else
71 delta = runtime->buffer_size + iprtd->offset
72 - iprtd->last_offset;
73
74 /* If we've transferred at least a period then report it and
75 * reset our poll time */
Sascha Hauer43a3cec2010-04-08 11:31:26 +020076 if (delta >= iprtd->period) {
Mark Brownb4e82b52010-02-25 12:52:10 +000077 snd_pcm_period_elapsed(substream);
78 iprtd->last_offset = iprtd->offset;
Mark Brownb4e82b52010-02-25 12:52:10 +000079 }
80
Sascha Hauer43a3cec2010-04-08 11:31:26 +020081 hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
Mark Brownb4e82b52010-02-25 12:52:10 +000082
Sascha Hauer43a3cec2010-04-08 11:31:26 +020083 return HRTIMER_RESTART;
Sascha Hauer83802222009-11-25 16:41:04 +010084}
85
86static struct fiq_handler fh = {
87 .name = DRV_NAME,
88};
89
90static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
91 struct snd_pcm_hw_params *params)
92{
93 struct snd_pcm_runtime *runtime = substream->runtime;
94 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
95
96 iprtd->size = params_buffer_bytes(params);
97 iprtd->periods = params_periods(params);
Mark Brownb4e82b52010-02-25 12:52:10 +000098 iprtd->period = params_period_bytes(params) ;
Sascha Hauer83802222009-11-25 16:41:04 +010099 iprtd->offset = 0;
Mark Brownb4e82b52010-02-25 12:52:10 +0000100 iprtd->last_offset = 0;
Sascha Hauer43a3cec2010-04-08 11:31:26 +0200101 iprtd->poll_time_ns = 1000000000 / params_rate(params) *
102 params_period_size(params);
Sascha Hauer83802222009-11-25 16:41:04 +0100103 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
104
105 return 0;
106}
107
108static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
109{
110 struct snd_pcm_runtime *runtime = substream->runtime;
111 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
112 struct pt_regs regs;
113
114 get_fiq_regs(&regs);
115 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
116 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
117 else
118 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
119
120 set_fiq_regs(&regs);
121
122 return 0;
123}
124
125static int fiq_enable;
126static int imx_pcm_fiq;
127
128static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
129{
130 struct snd_pcm_runtime *runtime = substream->runtime;
131 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
132
133 switch (cmd) {
134 case SNDRV_PCM_TRIGGER_START:
135 case SNDRV_PCM_TRIGGER_RESUME:
136 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
Sascha Hauer83926092010-04-14 09:17:30 +0200137 atomic_set(&iprtd->running, 1);
Sascha Hauer43a3cec2010-04-08 11:31:26 +0200138 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
139 HRTIMER_MODE_REL);
Sascha Hauer83802222009-11-25 16:41:04 +0100140 if (++fiq_enable == 1)
141 enable_fiq(imx_pcm_fiq);
142
143 break;
144
145 case SNDRV_PCM_TRIGGER_STOP:
146 case SNDRV_PCM_TRIGGER_SUSPEND:
147 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
Sascha Hauer83926092010-04-14 09:17:30 +0200148 atomic_set(&iprtd->running, 0);
149
Sascha Hauer83802222009-11-25 16:41:04 +0100150 if (--fiq_enable == 0)
151 disable_fiq(imx_pcm_fiq);
152
Sascha Hauer83802222009-11-25 16:41:04 +0100153 break;
154 default:
155 return -EINVAL;
156 }
157
158 return 0;
159}
160
161static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
162{
163 struct snd_pcm_runtime *runtime = substream->runtime;
164 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
165
166 return bytes_to_frames(substream->runtime, iprtd->offset);
167}
168
169static struct snd_pcm_hardware snd_imx_hardware = {
170 .info = SNDRV_PCM_INFO_INTERLEAVED |
171 SNDRV_PCM_INFO_BLOCK_TRANSFER |
172 SNDRV_PCM_INFO_MMAP |
173 SNDRV_PCM_INFO_MMAP_VALID |
174 SNDRV_PCM_INFO_PAUSE |
175 SNDRV_PCM_INFO_RESUME,
176 .formats = SNDRV_PCM_FMTBIT_S16_LE,
177 .rate_min = 8000,
178 .channels_min = 2,
179 .channels_max = 2,
180 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
181 .period_bytes_min = 128,
182 .period_bytes_max = 16 * 1024,
Sascha Hauer565a79f2010-04-14 09:17:31 +0200183 .periods_min = 4,
Sascha Hauer83802222009-11-25 16:41:04 +0100184 .periods_max = 255,
185 .fifo_size = 0,
186};
187
188static int snd_imx_open(struct snd_pcm_substream *substream)
189{
190 struct snd_pcm_runtime *runtime = substream->runtime;
191 struct imx_pcm_runtime_data *iprtd;
192 int ret;
193
194 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
Kulikov Vasiliy50e8ce12010-07-16 20:16:54 +0400195 if (iprtd == NULL)
196 return -ENOMEM;
Sascha Hauer83802222009-11-25 16:41:04 +0100197 runtime->private_data = iprtd;
198
Sascha Hauer43a3cec2010-04-08 11:31:26 +0200199 iprtd->substream = substream;
200
Sascha Hauer83926092010-04-14 09:17:30 +0200201 atomic_set(&iprtd->running, 0);
Sascha Hauer43a3cec2010-04-08 11:31:26 +0200202 hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
203 iprtd->hrt.function = snd_hrtimer_callback;
Sascha Hauer83802222009-11-25 16:41:04 +0100204
205 ret = snd_pcm_hw_constraint_integer(substream->runtime,
206 SNDRV_PCM_HW_PARAM_PERIODS);
Kulikov Vasiliy50e8ce12010-07-16 20:16:54 +0400207 if (ret < 0) {
208 kfree(iprtd);
Sascha Hauer83802222009-11-25 16:41:04 +0100209 return ret;
Kulikov Vasiliy50e8ce12010-07-16 20:16:54 +0400210 }
Sascha Hauer83802222009-11-25 16:41:04 +0100211
212 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
213 return 0;
214}
215
216static int snd_imx_close(struct snd_pcm_substream *substream)
217{
218 struct snd_pcm_runtime *runtime = substream->runtime;
219 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
220
Sascha Hauer43a3cec2010-04-08 11:31:26 +0200221 hrtimer_cancel(&iprtd->hrt);
222
Sascha Hauer83802222009-11-25 16:41:04 +0100223 kfree(iprtd);
224
225 return 0;
226}
227
Shawn Guodbdf6b52013-04-25 11:18:50 +0800228static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
229 struct vm_area_struct *vma)
230{
231 struct snd_pcm_runtime *runtime = substream->runtime;
232 int ret;
233
234 ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
235 runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
236
237 pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
238 runtime->dma_area,
239 runtime->dma_addr,
240 runtime->dma_bytes);
241 return ret;
242}
243
Sascha Hauer83802222009-11-25 16:41:04 +0100244static struct snd_pcm_ops imx_pcm_ops = {
245 .open = snd_imx_open,
246 .close = snd_imx_close,
247 .ioctl = snd_pcm_lib_ioctl,
248 .hw_params = snd_imx_pcm_hw_params,
249 .prepare = snd_imx_pcm_prepare,
250 .trigger = snd_imx_pcm_trigger,
251 .pointer = snd_imx_pcm_pointer,
252 .mmap = snd_imx_pcm_mmap,
253};
254
Shawn Guodbdf6b52013-04-25 11:18:50 +0800255static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
256{
257 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
258 struct snd_dma_buffer *buf = &substream->dma_buffer;
259 size_t size = IMX_SSI_DMABUF_SIZE;
260
261 buf->dev.type = SNDRV_DMA_TYPE_DEV;
262 buf->dev.dev = pcm->card->dev;
263 buf->private_data = NULL;
264 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
265 &buf->addr, GFP_KERNEL);
266 if (!buf->area)
267 return -ENOMEM;
268 buf->bytes = size;
269
270 return 0;
271}
272
273static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);
274
275static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
276{
277 struct snd_card *card = rtd->card->snd_card;
278 struct snd_pcm *pcm = rtd->pcm;
279 int ret = 0;
280
281 if (!card->dev->dma_mask)
282 card->dev->dma_mask = &imx_pcm_dmamask;
283 if (!card->dev->coherent_dma_mask)
284 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
285 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
286 ret = imx_pcm_preallocate_dma_buffer(pcm,
287 SNDRV_PCM_STREAM_PLAYBACK);
288 if (ret)
289 goto out;
290 }
291
292 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
293 ret = imx_pcm_preallocate_dma_buffer(pcm,
294 SNDRV_PCM_STREAM_CAPTURE);
295 if (ret)
296 goto out;
297 }
298
299out:
300 return ret;
301}
302
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000303static int ssi_irq = 0;
304
Liam Girdwood552d1ef2011-06-07 16:08:33 +0100305static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
Sascha Hauer83802222009-11-25 16:41:04 +0100306{
Liam Girdwood552d1ef2011-06-07 16:08:33 +0100307 struct snd_pcm *pcm = rtd->pcm;
Wolfram Sang35dcf582011-08-25 15:54:56 +0200308 struct snd_pcm_substream *substream;
Sascha Hauer83802222009-11-25 16:41:04 +0100309 int ret;
310
Liam Girdwood552d1ef2011-06-07 16:08:33 +0100311 ret = imx_pcm_new(rtd);
Sascha Hauer83802222009-11-25 16:41:04 +0100312 if (ret)
313 return ret;
314
Wolfram Sang35dcf582011-08-25 15:54:56 +0200315 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
316 if (substream) {
Sascha Hauer83802222009-11-25 16:41:04 +0100317 struct snd_dma_buffer *buf = &substream->dma_buffer;
318
319 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
320 }
321
Wolfram Sang35dcf582011-08-25 15:54:56 +0200322 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
323 if (substream) {
Sascha Hauer83802222009-11-25 16:41:04 +0100324 struct snd_dma_buffer *buf = &substream->dma_buffer;
325
326 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
327 }
328
329 set_fiq_handler(&imx_ssi_fiq_start,
330 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
331
332 return 0;
333}
334
Shawn Guodbdf6b52013-04-25 11:18:50 +0800335static void imx_pcm_free(struct snd_pcm *pcm)
336{
337 struct snd_pcm_substream *substream;
338 struct snd_dma_buffer *buf;
339 int stream;
340
341 for (stream = 0; stream < 2; stream++) {
342 substream = pcm->streams[stream].substream;
343 if (!substream)
344 continue;
345
346 buf = &substream->dma_buffer;
347 if (!buf->area)
348 continue;
349
350 dma_free_writecombine(pcm->card->dev, buf->bytes,
351 buf->area, buf->addr);
352 buf->area = NULL;
353 }
354}
355
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000356static void imx_pcm_fiq_free(struct snd_pcm *pcm)
357{
358 mxc_set_irq_fiq(ssi_irq, 0);
359 release_fiq(&fh);
360 imx_pcm_free(pcm);
361}
362
363static struct snd_soc_platform_driver imx_soc_platform_fiq = {
364 .ops = &imx_pcm_ops,
Sascha Hauer83802222009-11-25 16:41:04 +0100365 .pcm_new = imx_pcm_fiq_new,
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000366 .pcm_free = imx_pcm_fiq_free,
Sascha Hauer83802222009-11-25 16:41:04 +0100367};
368
Shawn Guo19276612013-01-28 14:25:43 +0800369int imx_pcm_fiq_init(struct platform_device *pdev)
Sascha Hauer83802222009-11-25 16:41:04 +0100370{
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000371 struct imx_ssi *ssi = platform_get_drvdata(pdev);
372 int ret;
Sascha Hauer83802222009-11-25 16:41:04 +0100373
374 ret = claim_fiq(&fh);
375 if (ret) {
376 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000377 return ret;
Sascha Hauer83802222009-11-25 16:41:04 +0100378 }
379
380 mxc_set_irq_fiq(ssi->irq, 1);
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000381 ssi_irq = ssi->irq;
Sascha Hauer83802222009-11-25 16:41:04 +0100382
383 imx_pcm_fiq = ssi->irq;
384
385 imx_ssi_fiq_base = (unsigned long)ssi->base;
386
Lars-Peter Clausena8909c92013-04-03 11:06:04 +0200387 ssi->dma_params_tx.maxburst = 4;
388 ssi->dma_params_rx.maxburst = 6;
Sascha Hauer83802222009-11-25 16:41:04 +0100389
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000390 ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
391 if (ret)
392 goto failed_register;
Sascha Hauer83802222009-11-25 16:41:04 +0100393
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000394 return 0;
395
396failed_register:
397 mxc_set_irq_fiq(ssi_irq, 0);
Sascha Hauer83802222009-11-25 16:41:04 +0100398 release_fiq(&fh);
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000399
400 return ret;
Sascha Hauer83802222009-11-25 16:41:04 +0100401}
Shawn Guodbdf6b52013-04-25 11:18:50 +0800402EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
Shawn Guo88e89f52013-04-25 11:18:48 +0800403
404void imx_pcm_fiq_exit(struct platform_device *pdev)
405{
406 snd_soc_unregister_platform(&pdev->dev);
407}
Shawn Guodbdf6b52013-04-25 11:18:50 +0800408EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);