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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_soc_component *component,
73 struct snd_pcm_substream *substream,
74 struct snd_pcm_hw_params *params)
75{
76 struct snd_pcm_runtime *runtime = substream->runtime;
77 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
78
79 iprtd->periods = params_periods(params);
80 iprtd->period = params_period_bytes(params);
81 iprtd->offset = 0;
82 iprtd->poll_time_ns = 1000000000 / params_rate(params) *
83 params_period_size(params);
84
85 return 0;
86}
87
88static int snd_imx_pcm_prepare(struct snd_soc_component *component,
89 struct snd_pcm_substream *substream)
90{
91 struct snd_pcm_runtime *runtime = substream->runtime;
92 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
93 struct pt_regs regs;
94
95 get_fiq_regs(®s);
96 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
97 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
98 else
99 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
100
101 set_fiq_regs(®s);
102
103 return 0;
104}
105
106static int imx_pcm_fiq;
107
108static int snd_imx_pcm_trigger(struct snd_soc_component *component,
109 struct snd_pcm_substream *substream, int cmd)
110{
111 struct snd_pcm_runtime *runtime = substream->runtime;
112 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
113
114 switch (cmd) {
115 case SNDRV_PCM_TRIGGER_START:
116 case SNDRV_PCM_TRIGGER_RESUME:
117 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
118 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
119 atomic_set(&iprtd->playing, 1);
120 else
121 atomic_set(&iprtd->capturing, 1);
122 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
123 HRTIMER_MODE_REL);
124 enable_fiq(imx_pcm_fiq);
125 break;
126
127 case SNDRV_PCM_TRIGGER_STOP:
128 case SNDRV_PCM_TRIGGER_SUSPEND:
129 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
130 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
131 atomic_set(&iprtd->playing, 0);
132 else
133 atomic_set(&iprtd->capturing, 0);
134 if (!atomic_read(&iprtd->playing) &&
135 !atomic_read(&iprtd->capturing))
136 disable_fiq(imx_pcm_fiq);
137 break;
138
139 default:
140 return -EINVAL;
141 }
142
143 return 0;
144}
145
146static snd_pcm_uframes_t
147snd_imx_pcm_pointer(struct snd_soc_component *component,
148 struct snd_pcm_substream *substream)
149{
150 struct snd_pcm_runtime *runtime = substream->runtime;
151 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
152
153 return bytes_to_frames(substream->runtime, iprtd->offset);
154}
155
156static const struct snd_pcm_hardware snd_imx_hardware = {
157 .info = SNDRV_PCM_INFO_INTERLEAVED |
158 SNDRV_PCM_INFO_BLOCK_TRANSFER |
159 SNDRV_PCM_INFO_MMAP |
160 SNDRV_PCM_INFO_MMAP_VALID |
161 SNDRV_PCM_INFO_PAUSE |
162 SNDRV_PCM_INFO_RESUME,
163 .formats = SNDRV_PCM_FMTBIT_S16_LE,
164 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
165 .period_bytes_min = 128,
166 .period_bytes_max = 16 * 1024,
167 .periods_min = 4,
168 .periods_max = 255,
169 .fifo_size = 0,
170};
171
172static int snd_imx_open(struct snd_soc_component *component,
173 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_soc_component *component,
203 struct snd_pcm_substream *substream)
204{
205 struct snd_pcm_runtime *runtime = substream->runtime;
206 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
207
208 hrtimer_cancel(&iprtd->hrt);
209
210 kfree(iprtd);
211
212 return 0;
213}
214
215static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
216{
217 struct snd_card *card = rtd->card->snd_card;
218 struct snd_pcm *pcm = rtd->pcm;
219 int ret;
220
221 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
222 if (ret)
223 return ret;
224
225 return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC,
226 pcm->card->dev,
227 IMX_SSI_DMABUF_SIZE);
228}
229
230static int ssi_irq;
231
232static int snd_imx_pcm_new(struct snd_soc_component *component,
233 struct snd_soc_pcm_runtime *rtd)
234{
235 struct snd_pcm *pcm = rtd->pcm;
236 struct snd_pcm_substream *substream;
237 int ret;
238
239 ret = imx_pcm_new(rtd);
240 if (ret)
241 return ret;
242
243 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
244 if (substream) {
245 struct snd_dma_buffer *buf = &substream->dma_buffer;
246
247 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
248 }
249
250 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
251 if (substream) {
252 struct snd_dma_buffer *buf = &substream->dma_buffer;
253
254 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
255 }
256
257 set_fiq_handler(&imx_ssi_fiq_start,
258 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
259
260 return 0;
261}
262
263static void snd_imx_pcm_free(struct snd_soc_component *component,
264 struct snd_pcm *pcm)
265{
266 mxc_set_irq_fiq(ssi_irq, 0);
267 release_fiq(&fh);
268}
269
270static const struct snd_soc_component_driver imx_soc_component_fiq = {
271 .open = snd_imx_open,
272 .close = snd_imx_close,
273 .hw_params = snd_imx_pcm_hw_params,
274 .prepare = snd_imx_pcm_prepare,
275 .trigger = snd_imx_pcm_trigger,
276 .pointer = snd_imx_pcm_pointer,
277 .pcm_construct = snd_imx_pcm_new,
278 .pcm_destruct = snd_imx_pcm_free,
279};
280
281int imx_pcm_fiq_init(struct platform_device *pdev,
282 struct imx_pcm_fiq_params *params)
283{
284 int ret;
285
286 ret = claim_fiq(&fh);
287 if (ret) {
288 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
289 return ret;
290 }
291
292 mxc_set_irq_fiq(params->irq, 1);
293 ssi_irq = params->irq;
294
295 imx_pcm_fiq = params->irq;
296
297 imx_ssi_fiq_base = (unsigned long)params->base;
298
299 params->dma_params_tx->maxburst = 4;
300 params->dma_params_rx->maxburst = 6;
301
302 ret = devm_snd_soc_register_component(&pdev->dev, &imx_soc_component_fiq,
303 NULL, 0);
304 if (ret)
305 goto failed_register;
306
307 return 0;
308
309failed_register:
310 mxc_set_irq_fiq(ssi_irq, 0);
311 release_fiq(&fh);
312
313 return ret;
314}
315EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
316
317void imx_pcm_fiq_exit(struct platform_device *pdev)
318{
319}
320EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
321
322MODULE_LICENSE("GPL");
323
