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8380222e SH |
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> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
8380222e SH |
23 | |
24 | #include <sound/core.h> | |
9051cba1 | 25 | #include <sound/dmaengine_pcm.h> |
8380222e SH |
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 | ||
82906b13 | 33 | #include <linux/platform_data/asoc-imx-ssi.h> |
8380222e SH |
34 | |
35 | #include "imx-ssi.h" | |
9051cba1 | 36 | #include "imx-pcm.h" |
8380222e SH |
37 | |
38 | struct imx_pcm_runtime_data { | |
2fb14880 | 39 | unsigned int period; |
8380222e | 40 | int periods; |
8380222e | 41 | unsigned long offset; |
43a3cec0 SH |
42 | struct hrtimer hrt; |
43 | int poll_time_ns; | |
44 | struct snd_pcm_substream *substream; | |
fc7dc61d OS |
45 | atomic_t playing; |
46 | atomic_t capturing; | |
8380222e SH |
47 | }; |
48 | ||
43a3cec0 | 49 | static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt) |
b4e82b5b | 50 | { |
43a3cec0 SH |
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; | |
8380222e SH |
54 | struct pt_regs regs; |
55 | ||
fc7dc61d | 56 | if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing)) |
83926099 SH |
57 | return HRTIMER_NORESTART; |
58 | ||
8380222e SH |
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 | ||
68f9672b | 66 | snd_pcm_period_elapsed(substream); |
b4e82b5b | 67 | |
43a3cec0 | 68 | hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns)); |
b4e82b5b | 69 | |
43a3cec0 | 70 | return HRTIMER_RESTART; |
8380222e SH |
71 | } |
72 | ||
73 | static struct fiq_handler fh = { | |
74 | .name = DRV_NAME, | |
75 | }; | |
76 | ||
77 | static 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 | ||
8380222e | 83 | iprtd->periods = params_periods(params); |
68f9672b | 84 | iprtd->period = params_period_bytes(params); |
8380222e | 85 | iprtd->offset = 0; |
43a3cec0 SH |
86 | iprtd->poll_time_ns = 1000000000 / params_rate(params) * |
87 | params_period_size(params); | |
8380222e SH |
88 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static 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 | ||
8380222e SH |
110 | static int imx_pcm_fiq; |
111 | ||
112 | static 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: | |
fc7dc61d OS |
121 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
122 | atomic_set(&iprtd->playing, 1); | |
123 | else | |
124 | atomic_set(&iprtd->capturing, 1); | |
43a3cec0 SH |
125 | hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns), |
126 | HRTIMER_MODE_REL); | |
fc7dc61d | 127 | enable_fiq(imx_pcm_fiq); |
8380222e SH |
128 | break; |
129 | ||
130 | case SNDRV_PCM_TRIGGER_STOP: | |
131 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
132 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
fc7dc61d OS |
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)) | |
8380222e | 139 | disable_fiq(imx_pcm_fiq); |
8380222e | 140 | break; |
fc7dc61d | 141 | |
8380222e SH |
142 | default: |
143 | return -EINVAL; | |
144 | } | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | static 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 | ||
157 | static 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, | |
8380222e SH |
165 | .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, |
166 | .period_bytes_min = 128, | |
167 | .period_bytes_max = 16 * 1024, | |
565a79f7 | 168 | .periods_min = 4, |
8380222e SH |
169 | .periods_max = 255, |
170 | .fifo_size = 0, | |
171 | }; | |
172 | ||
173 | static 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); | |
50e8ce14 KV |
180 | if (iprtd == NULL) |
181 | return -ENOMEM; | |
8380222e SH |
182 | runtime->private_data = iprtd; |
183 | ||
43a3cec0 SH |
184 | iprtd->substream = substream; |
185 | ||
fc7dc61d OS |
186 | atomic_set(&iprtd->playing, 0); |
187 | atomic_set(&iprtd->capturing, 0); | |
43a3cec0 SH |
188 | hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
189 | iprtd->hrt.function = snd_hrtimer_callback; | |
8380222e SH |
190 | |
191 | ret = snd_pcm_hw_constraint_integer(substream->runtime, | |
192 | SNDRV_PCM_HW_PARAM_PERIODS); | |
50e8ce14 KV |
193 | if (ret < 0) { |
194 | kfree(iprtd); | |
8380222e | 195 | return ret; |
50e8ce14 | 196 | } |
8380222e SH |
197 | |
198 | snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static 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 | ||
43a3cec0 SH |
207 | hrtimer_cancel(&iprtd->hrt); |
208 | ||
8380222e SH |
209 | kfree(iprtd); |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
dbdf6b54 SG |
214 | static 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 | ||
8380222e SH |
230 | static 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 | ||
dbdf6b54 SG |
241 | static 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 | ||
dbdf6b54 SG |
259 | static 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; | |
c9bd5e69 RK |
263 | int ret; |
264 | ||
265 | ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); | |
266 | if (ret) | |
267 | return ret; | |
dbdf6b54 | 268 | |
dbdf6b54 SG |
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) | |
ea9f8535 | 273 | return ret; |
dbdf6b54 SG |
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) | |
ea9f8535 | 280 | return ret; |
dbdf6b54 SG |
281 | } |
282 | ||
ea9f8535 | 283 | return 0; |
dbdf6b54 SG |
284 | } |
285 | ||
f0fba2ad LG |
286 | static int ssi_irq = 0; |
287 | ||
552d1ef6 | 288 | static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd) |
8380222e | 289 | { |
552d1ef6 | 290 | struct snd_pcm *pcm = rtd->pcm; |
35dcf586 | 291 | struct snd_pcm_substream *substream; |
8380222e SH |
292 | int ret; |
293 | ||
552d1ef6 | 294 | ret = imx_pcm_new(rtd); |
8380222e SH |
295 | if (ret) |
296 | return ret; | |
297 | ||
35dcf586 WS |
298 | substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; |
299 | if (substream) { | |
8380222e SH |
300 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
301 | ||
302 | imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; | |
303 | } | |
304 | ||
35dcf586 WS |
305 | substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; |
306 | if (substream) { | |
8380222e SH |
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 | ||
dbdf6b54 SG |
318 | static 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 | ||
f0fba2ad LG |
339 | static 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 | ||
346 | static struct snd_soc_platform_driver imx_soc_platform_fiq = { | |
347 | .ops = &imx_pcm_ops, | |
8380222e | 348 | .pcm_new = imx_pcm_fiq_new, |
f0fba2ad | 349 | .pcm_free = imx_pcm_fiq_free, |
8380222e SH |
350 | }; |
351 | ||
9051cba1 MP |
352 | int imx_pcm_fiq_init(struct platform_device *pdev, |
353 | struct imx_pcm_fiq_params *params) | |
8380222e | 354 | { |
f0fba2ad | 355 | int ret; |
8380222e SH |
356 | |
357 | ret = claim_fiq(&fh); | |
358 | if (ret) { | |
359 | dev_err(&pdev->dev, "failed to claim fiq: %d", ret); | |
f0fba2ad | 360 | return ret; |
8380222e SH |
361 | } |
362 | ||
9051cba1 MP |
363 | mxc_set_irq_fiq(params->irq, 1); |
364 | ssi_irq = params->irq; | |
8380222e | 365 | |
9051cba1 | 366 | imx_pcm_fiq = params->irq; |
8380222e | 367 | |
9051cba1 | 368 | imx_ssi_fiq_base = (unsigned long)params->base; |
8380222e | 369 | |
9051cba1 MP |
370 | params->dma_params_tx->maxburst = 4; |
371 | params->dma_params_rx->maxburst = 6; | |
8380222e | 372 | |
f0fba2ad LG |
373 | ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq); |
374 | if (ret) | |
375 | goto failed_register; | |
376 | ||
377 | return 0; | |
378 | ||
379 | failed_register: | |
380 | mxc_set_irq_fiq(ssi_irq, 0); | |
381 | release_fiq(&fh); | |
382 | ||
383 | return ret; | |
8380222e | 384 | } |
dbdf6b54 | 385 | EXPORT_SYMBOL_GPL(imx_pcm_fiq_init); |
88e89f55 SG |
386 | |
387 | void imx_pcm_fiq_exit(struct platform_device *pdev) | |
388 | { | |
389 | snd_soc_unregister_platform(&pdev->dev); | |
390 | } | |
dbdf6b54 | 391 | EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit); |
3c1c32d3 MB |
392 | |
393 | MODULE_LICENSE("GPL"); |