2 * imx-pcm-fiq.c -- ALSA Soc Audio Layer
4 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
6 * This code is based on code copyrighted by Freescale,
7 * Liam Girdwood, Javier Martin and probably others.
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.
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>
24 #include <sound/core.h>
25 #include <sound/dmaengine_pcm.h>
26 #include <sound/initval.h>
27 #include <sound/pcm.h>
28 #include <sound/pcm_params.h>
29 #include <sound/soc.h>
33 #include <linux/platform_data/asoc-imx-ssi.h>
38 struct imx_pcm_runtime_data {
44 struct snd_pcm_substream *substream;
48 static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
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;
55 if (!atomic_read(&iprtd->running))
56 return HRTIMER_NORESTART;
60 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
61 iprtd->offset = regs.ARM_r8 & 0xffff;
63 iprtd->offset = regs.ARM_r9 & 0xffff;
65 snd_pcm_period_elapsed(substream);
67 hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
69 return HRTIMER_RESTART;
72 static struct fiq_handler fh = {
76 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
77 struct snd_pcm_hw_params *params)
79 struct snd_pcm_runtime *runtime = substream->runtime;
80 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
82 iprtd->periods = params_periods(params);
83 iprtd->period = params_period_bytes(params);
85 iprtd->poll_time_ns = 1000000000 / params_rate(params) *
86 params_period_size(params);
87 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
92 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
94 struct snd_pcm_runtime *runtime = substream->runtime;
95 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
99 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
100 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
102 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
109 static int fiq_enable;
110 static int imx_pcm_fiq;
112 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
114 struct snd_pcm_runtime *runtime = substream->runtime;
115 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
118 case SNDRV_PCM_TRIGGER_START:
119 case SNDRV_PCM_TRIGGER_RESUME:
120 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
121 atomic_set(&iprtd->running, 1);
122 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
124 if (++fiq_enable == 1)
125 enable_fiq(imx_pcm_fiq);
129 case SNDRV_PCM_TRIGGER_STOP:
130 case SNDRV_PCM_TRIGGER_SUSPEND:
131 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
132 atomic_set(&iprtd->running, 0);
134 if (--fiq_enable == 0)
135 disable_fiq(imx_pcm_fiq);
145 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
147 struct snd_pcm_runtime *runtime = substream->runtime;
148 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
150 return bytes_to_frames(substream->runtime, iprtd->offset);
153 static struct snd_pcm_hardware snd_imx_hardware = {
154 .info = SNDRV_PCM_INFO_INTERLEAVED |
155 SNDRV_PCM_INFO_BLOCK_TRANSFER |
156 SNDRV_PCM_INFO_MMAP |
157 SNDRV_PCM_INFO_MMAP_VALID |
158 SNDRV_PCM_INFO_PAUSE |
159 SNDRV_PCM_INFO_RESUME,
160 .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,
172 static int snd_imx_open(struct snd_pcm_substream *substream)
174 struct snd_pcm_runtime *runtime = substream->runtime;
175 struct imx_pcm_runtime_data *iprtd;
178 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
181 runtime->private_data = iprtd;
183 iprtd->substream = substream;
185 atomic_set(&iprtd->running, 0);
186 hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
187 iprtd->hrt.function = snd_hrtimer_callback;
189 ret = snd_pcm_hw_constraint_integer(substream->runtime,
190 SNDRV_PCM_HW_PARAM_PERIODS);
196 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
200 static int snd_imx_close(struct snd_pcm_substream *substream)
202 struct snd_pcm_runtime *runtime = substream->runtime;
203 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
205 hrtimer_cancel(&iprtd->hrt);
212 static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
213 struct vm_area_struct *vma)
215 struct snd_pcm_runtime *runtime = substream->runtime;
218 ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
219 runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
221 pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
228 static 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,
239 static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
241 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
242 struct snd_dma_buffer *buf = &substream->dma_buffer;
243 size_t size = IMX_SSI_DMABUF_SIZE;
245 buf->dev.type = SNDRV_DMA_TYPE_DEV;
246 buf->dev.dev = pcm->card->dev;
247 buf->private_data = NULL;
248 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
249 &buf->addr, GFP_KERNEL);
257 static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);
259 static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
261 struct snd_card *card = rtd->card->snd_card;
262 struct snd_pcm *pcm = rtd->pcm;
265 if (!card->dev->dma_mask)
266 card->dev->dma_mask = &imx_pcm_dmamask;
267 if (!card->dev->coherent_dma_mask)
268 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
269 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
270 ret = imx_pcm_preallocate_dma_buffer(pcm,
271 SNDRV_PCM_STREAM_PLAYBACK);
276 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
277 ret = imx_pcm_preallocate_dma_buffer(pcm,
278 SNDRV_PCM_STREAM_CAPTURE);
287 static int ssi_irq = 0;
289 static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
291 struct snd_pcm *pcm = rtd->pcm;
292 struct snd_pcm_substream *substream;
295 ret = imx_pcm_new(rtd);
299 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
301 struct snd_dma_buffer *buf = &substream->dma_buffer;
303 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
306 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
308 struct snd_dma_buffer *buf = &substream->dma_buffer;
310 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
313 set_fiq_handler(&imx_ssi_fiq_start,
314 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
319 static void imx_pcm_free(struct snd_pcm *pcm)
321 struct snd_pcm_substream *substream;
322 struct snd_dma_buffer *buf;
325 for (stream = 0; stream < 2; stream++) {
326 substream = pcm->streams[stream].substream;
330 buf = &substream->dma_buffer;
334 dma_free_writecombine(pcm->card->dev, buf->bytes,
335 buf->area, buf->addr);
340 static void imx_pcm_fiq_free(struct snd_pcm *pcm)
342 mxc_set_irq_fiq(ssi_irq, 0);
347 static struct snd_soc_platform_driver imx_soc_platform_fiq = {
349 .pcm_new = imx_pcm_fiq_new,
350 .pcm_free = imx_pcm_fiq_free,
353 int imx_pcm_fiq_init(struct platform_device *pdev,
354 struct imx_pcm_fiq_params *params)
358 ret = claim_fiq(&fh);
360 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
364 mxc_set_irq_fiq(params->irq, 1);
365 ssi_irq = params->irq;
367 imx_pcm_fiq = params->irq;
369 imx_ssi_fiq_base = (unsigned long)params->base;
371 params->dma_params_tx->maxburst = 4;
372 params->dma_params_rx->maxburst = 6;
374 ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
376 goto failed_register;
381 mxc_set_irq_fiq(ssi_irq, 0);
386 EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
388 void imx_pcm_fiq_exit(struct platform_device *pdev)
390 snd_soc_unregister_platform(&pdev->dev);
392 EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
394 MODULE_LICENSE("GPL");