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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/dmaengine_pcm.h>
26#include <sound/initval.h>
27#include <sound/pcm.h>
28#include <sound/pcm_params.h>
29#include <sound/soc.h>
30
31#include <asm/fiq.h>
32
33#include <linux/platform_data/asoc-imx-ssi.h>
34
35#include "imx-ssi.h"
36#include "imx-pcm.h"
37
38struct imx_pcm_runtime_data {
39 unsigned int period;
40 int periods;
41 unsigned long offset;
42 struct hrtimer hrt;
43 int poll_time_ns;
44 struct snd_pcm_substream *substream;
45 atomic_t playing;
46 atomic_t capturing;
47};
48
49static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
50{
51 struct imx_pcm_runtime_data *iprtd =
52 container_of(hrt, struct imx_pcm_runtime_data, hrt);
53 struct snd_pcm_substream *substream = iprtd->substream;
54 struct pt_regs regs;
55
56 if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing))
57 return HRTIMER_NORESTART;
58
59 get_fiq_regs(®s);
60
61 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
62 iprtd->offset = regs.ARM_r8 & 0xffff;
63 else
64 iprtd->offset = regs.ARM_r9 & 0xffff;
65
66 snd_pcm_period_elapsed(substream);
67
68 hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
69
70 return HRTIMER_RESTART;
71}
72
73static struct fiq_handler fh = {
74 .name = DRV_NAME,
75};
76
77static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
78 struct snd_pcm_hw_params *params)
79{
80 struct snd_pcm_runtime *runtime = substream->runtime;
81 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
82
83 iprtd->periods = params_periods(params);
84 iprtd->period = params_period_bytes(params);
85 iprtd->offset = 0;
86 iprtd->poll_time_ns = 1000000000 / params_rate(params) *
87 params_period_size(params);
88 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
89
90 return 0;
91}
92
93static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
94{
95 struct snd_pcm_runtime *runtime = substream->runtime;
96 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
97 struct pt_regs regs;
98
99 get_fiq_regs(®s);
100 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
101 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
102 else
103 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
104
105 set_fiq_regs(®s);
106
107 return 0;
108}
109
110static int imx_pcm_fiq;
111
112static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
113{
114 struct snd_pcm_runtime *runtime = substream->runtime;
115 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
116
117 switch (cmd) {
118 case SNDRV_PCM_TRIGGER_START:
119 case SNDRV_PCM_TRIGGER_RESUME:
120 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
121 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
122 atomic_set(&iprtd->playing, 1);
123 else
124 atomic_set(&iprtd->capturing, 1);
125 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
126 HRTIMER_MODE_REL);
127 enable_fiq(imx_pcm_fiq);
128 break;
129
130 case SNDRV_PCM_TRIGGER_STOP:
131 case SNDRV_PCM_TRIGGER_SUSPEND:
132 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
133 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
134 atomic_set(&iprtd->playing, 0);
135 else
136 atomic_set(&iprtd->capturing, 0);
137 if (!atomic_read(&iprtd->playing) &&
138 !atomic_read(&iprtd->capturing))
139 disable_fiq(imx_pcm_fiq);
140 break;
141
142 default:
143 return -EINVAL;
144 }
145
146 return 0;
147}
148
149static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
150{
151 struct snd_pcm_runtime *runtime = substream->runtime;
152 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
153
154 return bytes_to_frames(substream->runtime, iprtd->offset);
155}
156
157static struct snd_pcm_hardware snd_imx_hardware = {
158 .info = SNDRV_PCM_INFO_INTERLEAVED |
159 SNDRV_PCM_INFO_BLOCK_TRANSFER |
160 SNDRV_PCM_INFO_MMAP |
161 SNDRV_PCM_INFO_MMAP_VALID |
162 SNDRV_PCM_INFO_PAUSE |
163 SNDRV_PCM_INFO_RESUME,
164 .formats = SNDRV_PCM_FMTBIT_S16_LE,
165 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
166 .period_bytes_min = 128,
167 .period_bytes_max = 16 * 1024,
168 .periods_min = 4,
169 .periods_max = 255,
170 .fifo_size = 0,
171};
172
173static int snd_imx_open(struct snd_pcm_substream *substream)
174{
175 struct snd_pcm_runtime *runtime = substream->runtime;
176 struct imx_pcm_runtime_data *iprtd;
177 int ret;
178
179 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
180 if (iprtd == NULL)
181 return -ENOMEM;
182 runtime->private_data = iprtd;
183
184 iprtd->substream = substream;
185
186 atomic_set(&iprtd->playing, 0);
187 atomic_set(&iprtd->capturing, 0);
188 hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
189 iprtd->hrt.function = snd_hrtimer_callback;
190
191 ret = snd_pcm_hw_constraint_integer(substream->runtime,
192 SNDRV_PCM_HW_PARAM_PERIODS);
193 if (ret < 0) {
194 kfree(iprtd);
195 return ret;
196 }
197
198 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
199 return 0;
200}
201
202static int snd_imx_close(struct snd_pcm_substream *substream)
203{
204 struct snd_pcm_runtime *runtime = substream->runtime;
205 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
206
207 hrtimer_cancel(&iprtd->hrt);
208
209 kfree(iprtd);
210
211 return 0;
212}
213
214static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
215 struct vm_area_struct *vma)
216{
217 struct snd_pcm_runtime *runtime = substream->runtime;
218 int ret;
219
220 ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
221 runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
222
223 pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
224 runtime->dma_area,
225 runtime->dma_addr,
226 runtime->dma_bytes);
227 return ret;
228}
229
230static struct snd_pcm_ops imx_pcm_ops = {
231 .open = snd_imx_open,
232 .close = snd_imx_close,
233 .ioctl = snd_pcm_lib_ioctl,
234 .hw_params = snd_imx_pcm_hw_params,
235 .prepare = snd_imx_pcm_prepare,
236 .trigger = snd_imx_pcm_trigger,
237 .pointer = snd_imx_pcm_pointer,
238 .mmap = snd_imx_pcm_mmap,
239};
240
241static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
242{
243 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
244 struct snd_dma_buffer *buf = &substream->dma_buffer;
245 size_t size = IMX_SSI_DMABUF_SIZE;
246
247 buf->dev.type = SNDRV_DMA_TYPE_DEV;
248 buf->dev.dev = pcm->card->dev;
249 buf->private_data = NULL;
250 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
251 &buf->addr, GFP_KERNEL);
252 if (!buf->area)
253 return -ENOMEM;
254 buf->bytes = size;
255
256 return 0;
257}
258
259static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
260{
261 struct snd_card *card = rtd->card->snd_card;
262 struct snd_pcm *pcm = rtd->pcm;
263 int ret;
264
265 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
266 if (ret)
267 return ret;
268
269 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
270 ret = imx_pcm_preallocate_dma_buffer(pcm,
271 SNDRV_PCM_STREAM_PLAYBACK);
272 if (ret)
273 return ret;
274 }
275
276 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
277 ret = imx_pcm_preallocate_dma_buffer(pcm,
278 SNDRV_PCM_STREAM_CAPTURE);
279 if (ret)
280 return ret;
281 }
282
283 return 0;
284}
285
286static int ssi_irq = 0;
287
288static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
289{
290 struct snd_pcm *pcm = rtd->pcm;
291 struct snd_pcm_substream *substream;
292 int ret;
293
294 ret = imx_pcm_new(rtd);
295 if (ret)
296 return ret;
297
298 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
299 if (substream) {
300 struct snd_dma_buffer *buf = &substream->dma_buffer;
301
302 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
303 }
304
305 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
306 if (substream) {
307 struct snd_dma_buffer *buf = &substream->dma_buffer;
308
309 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
310 }
311
312 set_fiq_handler(&imx_ssi_fiq_start,
313 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
314
315 return 0;
316}
317
318static void imx_pcm_free(struct snd_pcm *pcm)
319{
320 struct snd_pcm_substream *substream;
321 struct snd_dma_buffer *buf;
322 int stream;
323
324 for (stream = 0; stream < 2; stream++) {
325 substream = pcm->streams[stream].substream;
326 if (!substream)
327 continue;
328
329 buf = &substream->dma_buffer;
330 if (!buf->area)
331 continue;
332
333 dma_free_writecombine(pcm->card->dev, buf->bytes,
334 buf->area, buf->addr);
335 buf->area = NULL;
336 }
337}
338
339static void imx_pcm_fiq_free(struct snd_pcm *pcm)
340{
341 mxc_set_irq_fiq(ssi_irq, 0);
342 release_fiq(&fh);
343 imx_pcm_free(pcm);
344}
345
346static struct snd_soc_platform_driver imx_soc_platform_fiq = {
347 .ops = &imx_pcm_ops,
348 .pcm_new = imx_pcm_fiq_new,
349 .pcm_free = imx_pcm_fiq_free,
350};
351
352int imx_pcm_fiq_init(struct platform_device *pdev,
353 struct imx_pcm_fiq_params *params)
354{
355 int ret;
356
357 ret = claim_fiq(&fh);
358 if (ret) {
359 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
360 return ret;
361 }
362
363 mxc_set_irq_fiq(params->irq, 1);
364 ssi_irq = params->irq;
365
366 imx_pcm_fiq = params->irq;
367
368 imx_ssi_fiq_base = (unsigned long)params->base;
369
370 params->dma_params_tx->maxburst = 4;
371 params->dma_params_rx->maxburst = 6;
372
373 ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
374 if (ret)
375 goto failed_register;
376
377 return 0;
378
379failed_register:
380 mxc_set_irq_fiq(ssi_irq, 0);
381 release_fiq(&fh);
382
383 return ret;
384}
385EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
386
387void imx_pcm_fiq_exit(struct platform_device *pdev)
388{
389 snd_soc_unregister_platform(&pdev->dev);
390}
391EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
392
393MODULE_LICENSE("GPL");
394
