Commit | Line | Data |
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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; |
b4e82b5b | 42 | unsigned long last_offset; |
8380222e | 43 | unsigned long size; |
43a3cec0 SH |
44 | struct hrtimer hrt; |
45 | int poll_time_ns; | |
46 | struct snd_pcm_substream *substream; | |
83926099 | 47 | atomic_t running; |
8380222e SH |
48 | }; |
49 | ||
43a3cec0 | 50 | static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt) |
b4e82b5b | 51 | { |
43a3cec0 SH |
52 | struct imx_pcm_runtime_data *iprtd = |
53 | container_of(hrt, struct imx_pcm_runtime_data, hrt); | |
54 | struct snd_pcm_substream *substream = iprtd->substream; | |
8380222e | 55 | struct snd_pcm_runtime *runtime = substream->runtime; |
8380222e | 56 | struct pt_regs regs; |
b4e82b5b | 57 | unsigned long delta; |
8380222e | 58 | |
83926099 SH |
59 | if (!atomic_read(&iprtd->running)) |
60 | return HRTIMER_NORESTART; | |
61 | ||
8380222e SH |
62 | get_fiq_regs(®s); |
63 | ||
64 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
65 | iprtd->offset = regs.ARM_r8 & 0xffff; | |
66 | else | |
67 | iprtd->offset = regs.ARM_r9 & 0xffff; | |
68 | ||
b4e82b5b MB |
69 | /* How much data have we transferred since the last period report? */ |
70 | if (iprtd->offset >= iprtd->last_offset) | |
71 | delta = iprtd->offset - iprtd->last_offset; | |
72 | else | |
73 | delta = runtime->buffer_size + iprtd->offset | |
74 | - iprtd->last_offset; | |
75 | ||
76 | /* If we've transferred at least a period then report it and | |
77 | * reset our poll time */ | |
43a3cec0 | 78 | if (delta >= iprtd->period) { |
b4e82b5b MB |
79 | snd_pcm_period_elapsed(substream); |
80 | iprtd->last_offset = iprtd->offset; | |
b4e82b5b MB |
81 | } |
82 | ||
43a3cec0 | 83 | hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns)); |
b4e82b5b | 84 | |
43a3cec0 | 85 | return HRTIMER_RESTART; |
8380222e SH |
86 | } |
87 | ||
88 | static struct fiq_handler fh = { | |
89 | .name = DRV_NAME, | |
90 | }; | |
91 | ||
92 | static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream, | |
93 | struct snd_pcm_hw_params *params) | |
94 | { | |
95 | struct snd_pcm_runtime *runtime = substream->runtime; | |
96 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; | |
97 | ||
98 | iprtd->size = params_buffer_bytes(params); | |
99 | iprtd->periods = params_periods(params); | |
b4e82b5b | 100 | iprtd->period = params_period_bytes(params) ; |
8380222e | 101 | iprtd->offset = 0; |
b4e82b5b | 102 | iprtd->last_offset = 0; |
43a3cec0 SH |
103 | iprtd->poll_time_ns = 1000000000 / params_rate(params) * |
104 | params_period_size(params); | |
8380222e SH |
105 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream) | |
111 | { | |
112 | struct snd_pcm_runtime *runtime = substream->runtime; | |
113 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; | |
114 | struct pt_regs regs; | |
115 | ||
116 | get_fiq_regs(®s); | |
117 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
118 | regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16; | |
119 | else | |
120 | regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16; | |
121 | ||
122 | set_fiq_regs(®s); | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | static int fiq_enable; | |
128 | static int imx_pcm_fiq; | |
129 | ||
130 | static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
131 | { | |
132 | struct snd_pcm_runtime *runtime = substream->runtime; | |
133 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; | |
134 | ||
135 | switch (cmd) { | |
136 | case SNDRV_PCM_TRIGGER_START: | |
137 | case SNDRV_PCM_TRIGGER_RESUME: | |
138 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
83926099 | 139 | atomic_set(&iprtd->running, 1); |
43a3cec0 SH |
140 | hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns), |
141 | HRTIMER_MODE_REL); | |
8380222e SH |
142 | if (++fiq_enable == 1) |
143 | enable_fiq(imx_pcm_fiq); | |
144 | ||
145 | break; | |
146 | ||
147 | case SNDRV_PCM_TRIGGER_STOP: | |
148 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
149 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
83926099 SH |
150 | atomic_set(&iprtd->running, 0); |
151 | ||
8380222e SH |
152 | if (--fiq_enable == 0) |
153 | disable_fiq(imx_pcm_fiq); | |
154 | ||
8380222e SH |
155 | break; |
156 | default: | |
157 | return -EINVAL; | |
158 | } | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream) | |
164 | { | |
165 | struct snd_pcm_runtime *runtime = substream->runtime; | |
166 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; | |
167 | ||
168 | return bytes_to_frames(substream->runtime, iprtd->offset); | |
169 | } | |
170 | ||
171 | static struct snd_pcm_hardware snd_imx_hardware = { | |
172 | .info = SNDRV_PCM_INFO_INTERLEAVED | | |
173 | SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
174 | SNDRV_PCM_INFO_MMAP | | |
175 | SNDRV_PCM_INFO_MMAP_VALID | | |
176 | SNDRV_PCM_INFO_PAUSE | | |
177 | SNDRV_PCM_INFO_RESUME, | |
178 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
179 | .rate_min = 8000, | |
180 | .channels_min = 2, | |
181 | .channels_max = 2, | |
182 | .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, | |
183 | .period_bytes_min = 128, | |
184 | .period_bytes_max = 16 * 1024, | |
565a79f7 | 185 | .periods_min = 4, |
8380222e SH |
186 | .periods_max = 255, |
187 | .fifo_size = 0, | |
188 | }; | |
189 | ||
190 | static int snd_imx_open(struct snd_pcm_substream *substream) | |
191 | { | |
192 | struct snd_pcm_runtime *runtime = substream->runtime; | |
193 | struct imx_pcm_runtime_data *iprtd; | |
194 | int ret; | |
195 | ||
196 | iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); | |
50e8ce14 KV |
197 | if (iprtd == NULL) |
198 | return -ENOMEM; | |
8380222e SH |
199 | runtime->private_data = iprtd; |
200 | ||
43a3cec0 SH |
201 | iprtd->substream = substream; |
202 | ||
83926099 | 203 | atomic_set(&iprtd->running, 0); |
43a3cec0 SH |
204 | hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
205 | iprtd->hrt.function = snd_hrtimer_callback; | |
8380222e SH |
206 | |
207 | ret = snd_pcm_hw_constraint_integer(substream->runtime, | |
208 | SNDRV_PCM_HW_PARAM_PERIODS); | |
50e8ce14 KV |
209 | if (ret < 0) { |
210 | kfree(iprtd); | |
8380222e | 211 | return ret; |
50e8ce14 | 212 | } |
8380222e SH |
213 | |
214 | snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static int snd_imx_close(struct snd_pcm_substream *substream) | |
219 | { | |
220 | struct snd_pcm_runtime *runtime = substream->runtime; | |
221 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; | |
222 | ||
43a3cec0 SH |
223 | hrtimer_cancel(&iprtd->hrt); |
224 | ||
8380222e SH |
225 | kfree(iprtd); |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
dbdf6b54 SG |
230 | static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream, |
231 | struct vm_area_struct *vma) | |
232 | { | |
233 | struct snd_pcm_runtime *runtime = substream->runtime; | |
234 | int ret; | |
235 | ||
236 | ret = dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
237 | runtime->dma_area, runtime->dma_addr, runtime->dma_bytes); | |
238 | ||
239 | pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret, | |
240 | runtime->dma_area, | |
241 | runtime->dma_addr, | |
242 | runtime->dma_bytes); | |
243 | return ret; | |
244 | } | |
245 | ||
8380222e SH |
246 | static struct snd_pcm_ops imx_pcm_ops = { |
247 | .open = snd_imx_open, | |
248 | .close = snd_imx_close, | |
249 | .ioctl = snd_pcm_lib_ioctl, | |
250 | .hw_params = snd_imx_pcm_hw_params, | |
251 | .prepare = snd_imx_pcm_prepare, | |
252 | .trigger = snd_imx_pcm_trigger, | |
253 | .pointer = snd_imx_pcm_pointer, | |
254 | .mmap = snd_imx_pcm_mmap, | |
255 | }; | |
256 | ||
dbdf6b54 SG |
257 | static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) |
258 | { | |
259 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
260 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
261 | size_t size = IMX_SSI_DMABUF_SIZE; | |
262 | ||
263 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
264 | buf->dev.dev = pcm->card->dev; | |
265 | buf->private_data = NULL; | |
266 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
267 | &buf->addr, GFP_KERNEL); | |
268 | if (!buf->area) | |
269 | return -ENOMEM; | |
270 | buf->bytes = size; | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
275 | static u64 imx_pcm_dmamask = DMA_BIT_MASK(32); | |
276 | ||
277 | static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd) | |
278 | { | |
279 | struct snd_card *card = rtd->card->snd_card; | |
280 | struct snd_pcm *pcm = rtd->pcm; | |
281 | int ret = 0; | |
282 | ||
283 | if (!card->dev->dma_mask) | |
284 | card->dev->dma_mask = &imx_pcm_dmamask; | |
285 | if (!card->dev->coherent_dma_mask) | |
286 | card->dev->coherent_dma_mask = DMA_BIT_MASK(32); | |
287 | if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { | |
288 | ret = imx_pcm_preallocate_dma_buffer(pcm, | |
289 | SNDRV_PCM_STREAM_PLAYBACK); | |
290 | if (ret) | |
291 | goto out; | |
292 | } | |
293 | ||
294 | if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { | |
295 | ret = imx_pcm_preallocate_dma_buffer(pcm, | |
296 | SNDRV_PCM_STREAM_CAPTURE); | |
297 | if (ret) | |
298 | goto out; | |
299 | } | |
300 | ||
301 | out: | |
302 | return ret; | |
303 | } | |
304 | ||
f0fba2ad LG |
305 | static int ssi_irq = 0; |
306 | ||
552d1ef6 | 307 | static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd) |
8380222e | 308 | { |
552d1ef6 | 309 | struct snd_pcm *pcm = rtd->pcm; |
35dcf586 | 310 | struct snd_pcm_substream *substream; |
8380222e SH |
311 | int ret; |
312 | ||
552d1ef6 | 313 | ret = imx_pcm_new(rtd); |
8380222e SH |
314 | if (ret) |
315 | return ret; | |
316 | ||
35dcf586 WS |
317 | substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; |
318 | if (substream) { | |
8380222e SH |
319 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
320 | ||
321 | imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; | |
322 | } | |
323 | ||
35dcf586 WS |
324 | substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; |
325 | if (substream) { | |
8380222e SH |
326 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
327 | ||
328 | imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; | |
329 | } | |
330 | ||
331 | set_fiq_handler(&imx_ssi_fiq_start, | |
332 | &imx_ssi_fiq_end - &imx_ssi_fiq_start); | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
dbdf6b54 SG |
337 | static void imx_pcm_free(struct snd_pcm *pcm) |
338 | { | |
339 | struct snd_pcm_substream *substream; | |
340 | struct snd_dma_buffer *buf; | |
341 | int stream; | |
342 | ||
343 | for (stream = 0; stream < 2; stream++) { | |
344 | substream = pcm->streams[stream].substream; | |
345 | if (!substream) | |
346 | continue; | |
347 | ||
348 | buf = &substream->dma_buffer; | |
349 | if (!buf->area) | |
350 | continue; | |
351 | ||
352 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
353 | buf->area, buf->addr); | |
354 | buf->area = NULL; | |
355 | } | |
356 | } | |
357 | ||
f0fba2ad LG |
358 | static void imx_pcm_fiq_free(struct snd_pcm *pcm) |
359 | { | |
360 | mxc_set_irq_fiq(ssi_irq, 0); | |
361 | release_fiq(&fh); | |
362 | imx_pcm_free(pcm); | |
363 | } | |
364 | ||
365 | static struct snd_soc_platform_driver imx_soc_platform_fiq = { | |
366 | .ops = &imx_pcm_ops, | |
8380222e | 367 | .pcm_new = imx_pcm_fiq_new, |
f0fba2ad | 368 | .pcm_free = imx_pcm_fiq_free, |
8380222e SH |
369 | }; |
370 | ||
9051cba1 MP |
371 | int imx_pcm_fiq_init(struct platform_device *pdev, |
372 | struct imx_pcm_fiq_params *params) | |
8380222e | 373 | { |
f0fba2ad | 374 | int ret; |
8380222e SH |
375 | |
376 | ret = claim_fiq(&fh); | |
377 | if (ret) { | |
378 | dev_err(&pdev->dev, "failed to claim fiq: %d", ret); | |
f0fba2ad | 379 | return ret; |
8380222e SH |
380 | } |
381 | ||
9051cba1 MP |
382 | mxc_set_irq_fiq(params->irq, 1); |
383 | ssi_irq = params->irq; | |
8380222e | 384 | |
9051cba1 | 385 | imx_pcm_fiq = params->irq; |
8380222e | 386 | |
9051cba1 | 387 | imx_ssi_fiq_base = (unsigned long)params->base; |
8380222e | 388 | |
9051cba1 MP |
389 | params->dma_params_tx->maxburst = 4; |
390 | params->dma_params_rx->maxburst = 6; | |
8380222e | 391 | |
f0fba2ad LG |
392 | ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq); |
393 | if (ret) | |
394 | goto failed_register; | |
395 | ||
396 | return 0; | |
397 | ||
398 | failed_register: | |
399 | mxc_set_irq_fiq(ssi_irq, 0); | |
400 | release_fiq(&fh); | |
401 | ||
402 | return ret; | |
8380222e | 403 | } |
dbdf6b54 | 404 | EXPORT_SYMBOL_GPL(imx_pcm_fiq_init); |
88e89f55 SG |
405 | |
406 | void imx_pcm_fiq_exit(struct platform_device *pdev) | |
407 | { | |
408 | snd_soc_unregister_platform(&pdev->dev); | |
409 | } | |
dbdf6b54 | 410 | EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit); |
3c1c32d3 MB |
411 | |
412 | MODULE_LICENSE("GPL"); |