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1/*
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>
22#include <linux/slab.h>
23
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;
39 unsigned long offset;
40 unsigned long last_offset;
41 unsigned long size;
42 struct hrtimer hrt;
43 int poll_time_ns;
44 struct snd_pcm_substream *substream;
45 atomic_t running;
46};
47
48static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
49{
50 struct imx_pcm_runtime_data *iprtd =
51 container_of(hrt, struct imx_pcm_runtime_data, hrt);
52 struct snd_pcm_substream *substream = iprtd->substream;
53 struct snd_pcm_runtime *runtime = substream->runtime;
54 struct pt_regs regs;
55 unsigned long delta;
56
57 if (!atomic_read(&iprtd->running))
58 return HRTIMER_NORESTART;
59
60 get_fiq_regs(®s);
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
67 /* 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 */
76 if (delta >= iprtd->period) {
77 snd_pcm_period_elapsed(substream);
78 iprtd->last_offset = iprtd->offset;
79 }
80
81 hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
82
83 return HRTIMER_RESTART;
84}
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);
98 iprtd->period = params_period_bytes(params) ;
99 iprtd->offset = 0;
100 iprtd->last_offset = 0;
101 iprtd->poll_time_ns = 1000000000 / params_rate(params) *
102 params_period_size(params);
103 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(®s);
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(®s);
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:
137 atomic_set(&iprtd->running, 1);
138 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
139 HRTIMER_MODE_REL);
140 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:
148 atomic_set(&iprtd->running, 0);
149
150 if (--fiq_enable == 0)
151 disable_fiq(imx_pcm_fiq);
152
153 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,
183 .periods_min = 4,
184 .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);
195 if (iprtd == NULL)
196 return -ENOMEM;
197 runtime->private_data = iprtd;
198
199 iprtd->substream = substream;
200
201 atomic_set(&iprtd->running, 0);
202 hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
203 iprtd->hrt.function = snd_hrtimer_callback;
204
205 ret = snd_pcm_hw_constraint_integer(substream->runtime,
206 SNDRV_PCM_HW_PARAM_PERIODS);
207 if (ret < 0) {
208 kfree(iprtd);
209 return ret;
210 }
211
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
221 hrtimer_cancel(&iprtd->hrt);
222
223 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
239static int ssi_irq = 0;
240
241static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
242{
243 struct snd_soc_dai *dai = rtd->cpu_dai;
244 struct snd_pcm *pcm = rtd->pcm;
245 int ret;
246
247 ret = imx_pcm_new(rtd);
248 if (ret)
249 return ret;
250
251 if (dai->driver->playback.channels_min) {
252 struct snd_pcm_substream *substream =
253 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
254 struct snd_dma_buffer *buf = &substream->dma_buffer;
255
256 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
257 }
258
259 if (dai->driver->capture.channels_min) {
260 struct snd_pcm_substream *substream =
261 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
262 struct snd_dma_buffer *buf = &substream->dma_buffer;
263
264 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
265 }
266
267 set_fiq_handler(&imx_ssi_fiq_start,
268 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
269
270 return 0;
271}
272
273static void imx_pcm_fiq_free(struct snd_pcm *pcm)
274{
275 mxc_set_irq_fiq(ssi_irq, 0);
276 release_fiq(&fh);
277 imx_pcm_free(pcm);
278}
279
280static struct snd_soc_platform_driver imx_soc_platform_fiq = {
281 .ops = &imx_pcm_ops,
282 .pcm_new = imx_pcm_fiq_new,
283 .pcm_free = imx_pcm_fiq_free,
284};
285
286static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
287{
288 struct imx_ssi *ssi = platform_get_drvdata(pdev);
289 int ret;
290
291 ret = claim_fiq(&fh);
292 if (ret) {
293 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
294 return ret;
295 }
296
297 mxc_set_irq_fiq(ssi->irq, 1);
298 ssi_irq = ssi->irq;
299
300 imx_pcm_fiq = ssi->irq;
301
302 imx_ssi_fiq_base = (unsigned long)ssi->base;
303
304 ssi->dma_params_tx.burstsize = 4;
305 ssi->dma_params_rx.burstsize = 6;
306
307 ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
308 if (ret)
309 goto failed_register;
310
311 return 0;
312
313failed_register:
314 mxc_set_irq_fiq(ssi_irq, 0);
315 release_fiq(&fh);
316
317 return ret;
318}
319
320static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
321{
322 snd_soc_unregister_platform(&pdev->dev);
323 return 0;
324}
325
326static struct platform_driver imx_pcm_driver = {
327 .driver = {
328 .name = "imx-fiq-pcm-audio",
329 .owner = THIS_MODULE,
330 },
331
332 .probe = imx_soc_platform_probe,
333 .remove = __devexit_p(imx_soc_platform_remove),
334};
335
336static int __init snd_imx_pcm_init(void)
337{
338 return platform_driver_register(&imx_pcm_driver);
339}
340module_init(snd_imx_pcm_init);
341
342static void __exit snd_imx_pcm_exit(void)
343{
344 platform_driver_unregister(&imx_pcm_driver);
345}
346module_exit(snd_imx_pcm_exit);