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9#include <linux/clk.h>
10#include <linux/delay.h>
11#include <linux/device.h>
12#include <linux/dma-mapping.h>
13#include <linux/init.h>
14#include <linux/interrupt.h>
15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/slab.h>
18
19#include <sound/core.h>
20#include <sound/dmaengine_pcm.h>
21#include <sound/initval.h>
22#include <sound/pcm.h>
23#include <sound/pcm_params.h>
24#include <sound/soc.h>
25
26#include <asm/fiq.h>
27
28#include <linux/platform_data/asoc-imx-ssi.h>
29
30#include "imx-ssi.h"
31#include "imx-pcm.h"
32
33struct imx_pcm_runtime_data {
34 unsigned int period;
35 int periods;
36 unsigned long offset;
37 struct hrtimer hrt;
38 int poll_time_ns;
39 struct snd_pcm_substream *substream;
40 atomic_t playing;
41 atomic_t capturing;
42};
43
44static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
45{
46 struct imx_pcm_runtime_data *iprtd =
47 container_of(hrt, struct imx_pcm_runtime_data, hrt);
48 struct snd_pcm_substream *substream = iprtd->substream;
49 struct pt_regs regs;
50
51 if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing))
52 return HRTIMER_NORESTART;
53
54 get_fiq_regs(®s);
55
56 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
57 iprtd->offset = regs.ARM_r8 & 0xffff;
58 else
59 iprtd->offset = regs.ARM_r9 & 0xffff;
60
61 snd_pcm_period_elapsed(substream);
62
63 hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
64
65 return HRTIMER_RESTART;
66}
67
68static struct fiq_handler fh = {
69 .name = DRV_NAME,
70};
71
72static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
73 struct snd_pcm_hw_params *params)
74{
75 struct snd_pcm_runtime *runtime = substream->runtime;
76 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
77
78 iprtd->periods = params_periods(params);
79 iprtd->period = params_period_bytes(params);
80 iprtd->offset = 0;
81 iprtd->poll_time_ns = 1000000000 / params_rate(params) *
82 params_period_size(params);
83 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
84
85 return 0;
86}
87
88static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
89{
90 struct snd_pcm_runtime *runtime = substream->runtime;
91 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
92 struct pt_regs regs;
93
94 get_fiq_regs(®s);
95 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
96 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
97 else
98 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
99
100 set_fiq_regs(®s);
101
102 return 0;
103}
104
105static int imx_pcm_fiq;
106
107static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
108{
109 struct snd_pcm_runtime *runtime = substream->runtime;
110 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
111
112 switch (cmd) {
113 case SNDRV_PCM_TRIGGER_START:
114 case SNDRV_PCM_TRIGGER_RESUME:
115 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
116 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
117 atomic_set(&iprtd->playing, 1);
118 else
119 atomic_set(&iprtd->capturing, 1);
120 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
121 HRTIMER_MODE_REL);
122 enable_fiq(imx_pcm_fiq);
123 break;
124
125 case SNDRV_PCM_TRIGGER_STOP:
126 case SNDRV_PCM_TRIGGER_SUSPEND:
127 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
128 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
129 atomic_set(&iprtd->playing, 0);
130 else
131 atomic_set(&iprtd->capturing, 0);
132 if (!atomic_read(&iprtd->playing) &&
133 !atomic_read(&iprtd->capturing))
134 disable_fiq(imx_pcm_fiq);
135 break;
136
137 default:
138 return -EINVAL;
139 }
140
141 return 0;
142}
143
144static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
145{
146 struct snd_pcm_runtime *runtime = substream->runtime;
147 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
148
149 return bytes_to_frames(substream->runtime, iprtd->offset);
150}
151
152static const struct snd_pcm_hardware snd_imx_hardware = {
153 .info = SNDRV_PCM_INFO_INTERLEAVED |
154 SNDRV_PCM_INFO_BLOCK_TRANSFER |
155 SNDRV_PCM_INFO_MMAP |
156 SNDRV_PCM_INFO_MMAP_VALID |
157 SNDRV_PCM_INFO_PAUSE |
158 SNDRV_PCM_INFO_RESUME,
159 .formats = SNDRV_PCM_FMTBIT_S16_LE,
160 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
161 .period_bytes_min = 128,
162 .period_bytes_max = 16 * 1024,
163 .periods_min = 4,
164 .periods_max = 255,
165 .fifo_size = 0,
166};
167
168static int snd_imx_open(struct snd_pcm_substream *substream)
169{
170 struct snd_pcm_runtime *runtime = substream->runtime;
171 struct imx_pcm_runtime_data *iprtd;
172 int ret;
173
174 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
175 if (iprtd == NULL)
176 return -ENOMEM;
177 runtime->private_data = iprtd;
178
179 iprtd->substream = substream;
180
181 atomic_set(&iprtd->playing, 0);
182 atomic_set(&iprtd->capturing, 0);
183 hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
184 iprtd->hrt.function = snd_hrtimer_callback;
185
186 ret = snd_pcm_hw_constraint_integer(substream->runtime,
187 SNDRV_PCM_HW_PARAM_PERIODS);
188 if (ret < 0) {
189 kfree(iprtd);
190 return ret;
191 }
192
193 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
194 return 0;
195}
196
197static int snd_imx_close(struct snd_pcm_substream *substream)
198{
199 struct snd_pcm_runtime *runtime = substream->runtime;
200 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
201
202 hrtimer_cancel(&iprtd->hrt);
203
204 kfree(iprtd);
205
206 return 0;
207}
208
209static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
210 struct vm_area_struct *vma)
211{
212 struct snd_pcm_runtime *runtime = substream->runtime;
213 int ret;
214
215 ret = dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
216 runtime->dma_addr, runtime->dma_bytes);
217
218 pr_debug("%s: ret: %d %p %pad 0x%08zx\n", __func__, ret,
219 runtime->dma_area,
220 &runtime->dma_addr,
221 runtime->dma_bytes);
222 return ret;
223}
224
225static const struct snd_pcm_ops imx_pcm_ops = {
226 .open = snd_imx_open,
227 .close = snd_imx_close,
228 .ioctl = snd_pcm_lib_ioctl,
229 .hw_params = snd_imx_pcm_hw_params,
230 .prepare = snd_imx_pcm_prepare,
231 .trigger = snd_imx_pcm_trigger,
232 .pointer = snd_imx_pcm_pointer,
233 .mmap = snd_imx_pcm_mmap,
234};
235
236static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
237{
238 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
239 struct snd_dma_buffer *buf = &substream->dma_buffer;
240 size_t size = IMX_SSI_DMABUF_SIZE;
241
242 buf->dev.type = SNDRV_DMA_TYPE_DEV;
243 buf->dev.dev = pcm->card->dev;
244 buf->private_data = NULL;
245 buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
246 if (!buf->area)
247 return -ENOMEM;
248 buf->bytes = size;
249
250 return 0;
251}
252
253static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
254{
255 struct snd_card *card = rtd->card->snd_card;
256 struct snd_pcm *pcm = rtd->pcm;
257 int ret;
258
259 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
260 if (ret)
261 return ret;
262
263 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
264 ret = imx_pcm_preallocate_dma_buffer(pcm,
265 SNDRV_PCM_STREAM_PLAYBACK);
266 if (ret)
267 return ret;
268 }
269
270 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
271 ret = imx_pcm_preallocate_dma_buffer(pcm,
272 SNDRV_PCM_STREAM_CAPTURE);
273 if (ret)
274 return ret;
275 }
276
277 return 0;
278}
279
280static int ssi_irq;
281
282static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
283{
284 struct snd_pcm *pcm = rtd->pcm;
285 struct snd_pcm_substream *substream;
286 int ret;
287
288 ret = imx_pcm_new(rtd);
289 if (ret)
290 return ret;
291
292 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
293 if (substream) {
294 struct snd_dma_buffer *buf = &substream->dma_buffer;
295
296 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
297 }
298
299 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
300 if (substream) {
301 struct snd_dma_buffer *buf = &substream->dma_buffer;
302
303 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
304 }
305
306 set_fiq_handler(&imx_ssi_fiq_start,
307 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
308
309 return 0;
310}
311
312static void imx_pcm_free(struct snd_pcm *pcm)
313{
314 struct snd_pcm_substream *substream;
315 struct snd_dma_buffer *buf;
316 int stream;
317
318 for (stream = 0; stream < 2; stream++) {
319 substream = pcm->streams[stream].substream;
320 if (!substream)
321 continue;
322
323 buf = &substream->dma_buffer;
324 if (!buf->area)
325 continue;
326
327 dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
328 buf->area = NULL;
329 }
330}
331
332static void imx_pcm_fiq_free(struct snd_pcm *pcm)
333{
334 mxc_set_irq_fiq(ssi_irq, 0);
335 release_fiq(&fh);
336 imx_pcm_free(pcm);
337}
338
339static const struct snd_soc_component_driver imx_soc_component_fiq = {
340 .ops = &imx_pcm_ops,
341 .pcm_new = imx_pcm_fiq_new,
342 .pcm_free = imx_pcm_fiq_free,
343};
344
345int imx_pcm_fiq_init(struct platform_device *pdev,
346 struct imx_pcm_fiq_params *params)
347{
348 int ret;
349
350 ret = claim_fiq(&fh);
351 if (ret) {
352 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
353 return ret;
354 }
355
356 mxc_set_irq_fiq(params->irq, 1);
357 ssi_irq = params->irq;
358
359 imx_pcm_fiq = params->irq;
360
361 imx_ssi_fiq_base = (unsigned long)params->base;
362
363 params->dma_params_tx->maxburst = 4;
364 params->dma_params_rx->maxburst = 6;
365
366 ret = devm_snd_soc_register_component(&pdev->dev, &imx_soc_component_fiq,
367 NULL, 0);
368 if (ret)
369 goto failed_register;
370
371 return 0;
372
373failed_register:
374 mxc_set_irq_fiq(ssi_irq, 0);
375 release_fiq(&fh);
376
377 return ret;
378}
379EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
380
381void imx_pcm_fiq_exit(struct platform_device *pdev)
382{
383}
384EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
385
386MODULE_LICENSE("GPL");
387
