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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/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
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
75
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_card *card, struct snd_soc_dai *dai,
242 struct snd_pcm *pcm)
243{
244 int ret;
245
246 ret = imx_pcm_new(card, dai, pcm);
247 if (ret)
248 return ret;
249
250 if (dai->driver->playback.channels_min) {
251 struct snd_pcm_substream *substream =
252 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
253 struct snd_dma_buffer *buf = &substream->dma_buffer;
254
255 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
256 }
257
258 if (dai->driver->capture.channels_min) {
259 struct snd_pcm_substream *substream =
260 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
261 struct snd_dma_buffer *buf = &substream->dma_buffer;
262
263 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
264 }
265
266 set_fiq_handler(&imx_ssi_fiq_start,
267 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
268
269 return 0;
270}
271
272static void imx_pcm_fiq_free(struct snd_pcm *pcm)
273{
274 mxc_set_irq_fiq(ssi_irq, 0);
275 release_fiq(&fh);
276 imx_pcm_free(pcm);
277}
278
279static struct snd_soc_platform_driver imx_soc_platform_fiq = {
280 .ops = &imx_pcm_ops,
281 .pcm_new = imx_pcm_fiq_new,
282 .pcm_free = imx_pcm_fiq_free,
283};
284
285static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
286{
287 struct imx_ssi *ssi = platform_get_drvdata(pdev);
288 int ret;
289
290 ret = claim_fiq(&fh);
291 if (ret) {
292 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
293 return ret;
294 }
295
296 mxc_set_irq_fiq(ssi->irq, 1);
297 ssi_irq = ssi->irq;
298
299 imx_pcm_fiq = ssi->irq;
300
301 imx_ssi_fiq_base = (unsigned long)ssi->base;
302
303 ssi->dma_params_tx.burstsize = 4;
304 ssi->dma_params_rx.burstsize = 6;
305
306 ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
307 if (ret)
308 goto failed_register;
309
310 return 0;
311
312failed_register:
313 mxc_set_irq_fiq(ssi_irq, 0);
314 release_fiq(&fh);
315
316 return ret;
317}
318
319static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
320{
321 snd_soc_unregister_platform(&pdev->dev);
322 return 0;
323}
324
325static struct platform_driver imx_pcm_driver = {
326 .driver = {
327 .name = "imx-fiq-pcm-audio",
328 .owner = THIS_MODULE,
329 },
330
331 .probe = imx_soc_platform_probe,
332 .remove = __devexit_p(imx_soc_platform_remove),
333};
334
335static int __init snd_imx_pcm_init(void)
336{
337 return platform_driver_register(&imx_pcm_driver);
338}
339module_init(snd_imx_pcm_init);
340
341static void __exit snd_imx_pcm_exit(void)
342{
343 platform_driver_unregister(&imx_pcm_driver);
344}
345module_exit(snd_imx_pcm_exit);
346
