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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
32#include <mach/ssi.h>
33
34#include "imx-ssi.h"
35
36struct imx_pcm_runtime_data {
37 int period;
38 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
228static struct snd_pcm_ops imx_pcm_ops = {
229 .open = snd_imx_open,
230 .close = snd_imx_close,
231 .ioctl = snd_pcm_lib_ioctl,
232 .hw_params = snd_imx_pcm_hw_params,
233 .prepare = snd_imx_pcm_prepare,
234 .trigger = snd_imx_pcm_trigger,
235 .pointer = snd_imx_pcm_pointer,
236 .mmap = snd_imx_pcm_mmap,
237};
238
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000239static int ssi_irq = 0;
240
Liam Girdwood552d1ef2011-06-07 16:08:33 +0100241static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
Sascha Hauer83802222009-11-25 16:41:04 +0100242{
Liam Girdwood552d1ef2011-06-07 16:08:33 +0100243 struct snd_card *card = rtd->card->snd_card;
244 struct snd_soc_dai *dai = rtd->cpu_dai;
245 struct snd_pcm *pcm = rtd->pcm;
Sascha Hauer83802222009-11-25 16:41:04 +0100246 int ret;
247
Liam Girdwood552d1ef2011-06-07 16:08:33 +0100248 ret = imx_pcm_new(rtd);
Sascha Hauer83802222009-11-25 16:41:04 +0100249 if (ret)
250 return ret;
251
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000252 if (dai->driver->playback.channels_min) {
Sascha Hauer83802222009-11-25 16:41:04 +0100253 struct snd_pcm_substream *substream =
254 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
255 struct snd_dma_buffer *buf = &substream->dma_buffer;
256
257 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
258 }
259
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000260 if (dai->driver->capture.channels_min) {
Sascha Hauer83802222009-11-25 16:41:04 +0100261 struct snd_pcm_substream *substream =
262 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
263 struct snd_dma_buffer *buf = &substream->dma_buffer;
264
265 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
266 }
267
268 set_fiq_handler(&imx_ssi_fiq_start,
269 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
270
271 return 0;
272}
273
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000274static void imx_pcm_fiq_free(struct snd_pcm *pcm)
275{
276 mxc_set_irq_fiq(ssi_irq, 0);
277 release_fiq(&fh);
278 imx_pcm_free(pcm);
279}
280
281static struct snd_soc_platform_driver imx_soc_platform_fiq = {
282 .ops = &imx_pcm_ops,
Sascha Hauer83802222009-11-25 16:41:04 +0100283 .pcm_new = imx_pcm_fiq_new,
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000284 .pcm_free = imx_pcm_fiq_free,
Sascha Hauer83802222009-11-25 16:41:04 +0100285};
286
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000287static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
Sascha Hauer83802222009-11-25 16:41:04 +0100288{
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000289 struct imx_ssi *ssi = platform_get_drvdata(pdev);
290 int ret;
Sascha Hauer83802222009-11-25 16:41:04 +0100291
292 ret = claim_fiq(&fh);
293 if (ret) {
294 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000295 return ret;
Sascha Hauer83802222009-11-25 16:41:04 +0100296 }
297
298 mxc_set_irq_fiq(ssi->irq, 1);
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000299 ssi_irq = ssi->irq;
Sascha Hauer83802222009-11-25 16:41:04 +0100300
301 imx_pcm_fiq = ssi->irq;
302
303 imx_ssi_fiq_base = (unsigned long)ssi->base;
304
305 ssi->dma_params_tx.burstsize = 4;
306 ssi->dma_params_rx.burstsize = 6;
307
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000308 ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
309 if (ret)
310 goto failed_register;
Sascha Hauer83802222009-11-25 16:41:04 +0100311
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000312 return 0;
313
314failed_register:
315 mxc_set_irq_fiq(ssi_irq, 0);
Sascha Hauer83802222009-11-25 16:41:04 +0100316 release_fiq(&fh);
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000317
318 return ret;
Sascha Hauer83802222009-11-25 16:41:04 +0100319}
320
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000321static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
322{
323 snd_soc_unregister_platform(&pdev->dev);
324 return 0;
325}
326
327static struct platform_driver imx_pcm_driver = {
328 .driver = {
329 .name = "imx-fiq-pcm-audio",
330 .owner = THIS_MODULE,
331 },
332
333 .probe = imx_soc_platform_probe,
334 .remove = __devexit_p(imx_soc_platform_remove),
335};
336
337static int __init snd_imx_pcm_init(void)
338{
339 return platform_driver_register(&imx_pcm_driver);
340}
341module_init(snd_imx_pcm_init);
342
343static void __exit snd_imx_pcm_exit(void)
344{
345 platform_driver_unregister(&imx_pcm_driver);
346}
347module_exit(snd_imx_pcm_exit);