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 {
42 unsigned long last_offset;
46 struct snd_pcm_substream *substream;
50 static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
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;
55 struct snd_pcm_runtime *runtime = substream->runtime;
59 if (!atomic_read(&iprtd->running))
60 return HRTIMER_NORESTART;
64 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
65 iprtd->offset = regs.ARM_r8 & 0xffff;
67 iprtd->offset = regs.ARM_r9 & 0xffff;
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;
73 delta = runtime->buffer_size + iprtd->offset
76 /* If we've transferred at least a period then report it and
77 * reset our poll time */
78 if (delta >= iprtd->period) {
79 snd_pcm_period_elapsed(substream);
80 iprtd->last_offset = iprtd->offset;
83 hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
85 return HRTIMER_RESTART;
88 static struct fiq_handler fh = {
92 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
93 struct snd_pcm_hw_params *params)
95 struct snd_pcm_runtime *runtime = substream->runtime;
96 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
98 iprtd->size = params_buffer_bytes(params);
99 iprtd->periods = params_periods(params);
100 iprtd->period = params_period_bytes(params) ;
102 iprtd->last_offset = 0;
103 iprtd->poll_time_ns = 1000000000 / params_rate(params) *
104 params_period_size(params);
105 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
110 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
112 struct snd_pcm_runtime *runtime = substream->runtime;
113 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
117 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
118 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
120 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
127 static int fiq_enable;
128 static int imx_pcm_fiq;
130 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
132 struct snd_pcm_runtime *runtime = substream->runtime;
133 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
136 case SNDRV_PCM_TRIGGER_START:
137 case SNDRV_PCM_TRIGGER_RESUME:
138 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
139 atomic_set(&iprtd->running, 1);
140 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
142 if (++fiq_enable == 1)
143 enable_fiq(imx_pcm_fiq);
147 case SNDRV_PCM_TRIGGER_STOP:
148 case SNDRV_PCM_TRIGGER_SUSPEND:
149 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
150 atomic_set(&iprtd->running, 0);
152 if (--fiq_enable == 0)
153 disable_fiq(imx_pcm_fiq);
163 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
165 struct snd_pcm_runtime *runtime = substream->runtime;
166 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
168 return bytes_to_frames(substream->runtime, iprtd->offset);
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,
182 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
183 .period_bytes_min = 128,
184 .period_bytes_max = 16 * 1024,
190 static int snd_imx_open(struct snd_pcm_substream *substream)
192 struct snd_pcm_runtime *runtime = substream->runtime;
193 struct imx_pcm_runtime_data *iprtd;
196 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
199 runtime->private_data = iprtd;
201 iprtd->substream = substream;
203 atomic_set(&iprtd->running, 0);
204 hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
205 iprtd->hrt.function = snd_hrtimer_callback;
207 ret = snd_pcm_hw_constraint_integer(substream->runtime,
208 SNDRV_PCM_HW_PARAM_PERIODS);
214 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
218 static int snd_imx_close(struct snd_pcm_substream *substream)
220 struct snd_pcm_runtime *runtime = substream->runtime;
221 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
223 hrtimer_cancel(&iprtd->hrt);
230 static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
231 struct vm_area_struct *vma)
233 struct snd_pcm_runtime *runtime = substream->runtime;
236 ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
237 runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
239 pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
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,
257 static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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;
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);
275 static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
277 struct snd_card *card = rtd->card->snd_card;
278 struct snd_pcm *pcm = rtd->pcm;
281 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
285 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
286 ret = imx_pcm_preallocate_dma_buffer(pcm,
287 SNDRV_PCM_STREAM_PLAYBACK);
292 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
293 ret = imx_pcm_preallocate_dma_buffer(pcm,
294 SNDRV_PCM_STREAM_CAPTURE);
303 static int ssi_irq = 0;
305 static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
307 struct snd_pcm *pcm = rtd->pcm;
308 struct snd_pcm_substream *substream;
311 ret = imx_pcm_new(rtd);
315 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
317 struct snd_dma_buffer *buf = &substream->dma_buffer;
319 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
322 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
324 struct snd_dma_buffer *buf = &substream->dma_buffer;
326 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
329 set_fiq_handler(&imx_ssi_fiq_start,
330 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
335 static void imx_pcm_free(struct snd_pcm *pcm)
337 struct snd_pcm_substream *substream;
338 struct snd_dma_buffer *buf;
341 for (stream = 0; stream < 2; stream++) {
342 substream = pcm->streams[stream].substream;
346 buf = &substream->dma_buffer;
350 dma_free_writecombine(pcm->card->dev, buf->bytes,
351 buf->area, buf->addr);
356 static void imx_pcm_fiq_free(struct snd_pcm *pcm)
358 mxc_set_irq_fiq(ssi_irq, 0);
363 static struct snd_soc_platform_driver imx_soc_platform_fiq = {
365 .pcm_new = imx_pcm_fiq_new,
366 .pcm_free = imx_pcm_fiq_free,
369 int imx_pcm_fiq_init(struct platform_device *pdev,
370 struct imx_pcm_fiq_params *params)
374 ret = claim_fiq(&fh);
376 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
380 mxc_set_irq_fiq(params->irq, 1);
381 ssi_irq = params->irq;
383 imx_pcm_fiq = params->irq;
385 imx_ssi_fiq_base = (unsigned long)params->base;
387 params->dma_params_tx->maxburst = 4;
388 params->dma_params_rx->maxburst = 6;
390 ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
392 goto failed_register;
397 mxc_set_irq_fiq(ssi_irq, 0);
402 EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
404 void imx_pcm_fiq_exit(struct platform_device *pdev)
406 snd_soc_unregister_platform(&pdev->dev);
408 EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
410 MODULE_LICENSE("GPL");