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>
23 #include <sound/core.h>
24 #include <sound/initval.h>
25 #include <sound/pcm.h>
26 #include <sound/pcm_params.h>
27 #include <sound/soc.h>
35 struct imx_pcm_runtime_data {
39 unsigned long last_offset;
43 struct snd_pcm_substream *substream;
46 static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
48 struct imx_pcm_runtime_data *iprtd =
49 container_of(hrt, struct imx_pcm_runtime_data, hrt);
50 struct snd_pcm_substream *substream = iprtd->substream;
51 struct snd_pcm_runtime *runtime = substream->runtime;
57 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
58 iprtd->offset = regs.ARM_r8 & 0xffff;
60 iprtd->offset = regs.ARM_r9 & 0xffff;
62 /* How much data have we transferred since the last period report? */
63 if (iprtd->offset >= iprtd->last_offset)
64 delta = iprtd->offset - iprtd->last_offset;
66 delta = runtime->buffer_size + iprtd->offset
69 /* If we've transferred at least a period then report it and
70 * reset our poll time */
71 if (delta >= iprtd->period) {
72 snd_pcm_period_elapsed(substream);
73 iprtd->last_offset = iprtd->offset;
76 hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
78 return HRTIMER_RESTART;
81 static struct fiq_handler fh = {
85 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
86 struct snd_pcm_hw_params *params)
88 struct snd_pcm_runtime *runtime = substream->runtime;
89 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
91 iprtd->size = params_buffer_bytes(params);
92 iprtd->periods = params_periods(params);
93 iprtd->period = params_period_bytes(params) ;
95 iprtd->last_offset = 0;
96 iprtd->poll_time_ns = 1000000000 / params_rate(params) *
97 params_period_size(params);
98 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
103 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
105 struct snd_pcm_runtime *runtime = substream->runtime;
106 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
110 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
111 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
113 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
120 static int fiq_enable;
121 static int imx_pcm_fiq;
123 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
125 struct snd_pcm_runtime *runtime = substream->runtime;
126 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
129 case SNDRV_PCM_TRIGGER_START:
130 case SNDRV_PCM_TRIGGER_RESUME:
131 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
132 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
134 if (++fiq_enable == 1)
135 enable_fiq(imx_pcm_fiq);
139 case SNDRV_PCM_TRIGGER_STOP:
140 case SNDRV_PCM_TRIGGER_SUSPEND:
141 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
142 hrtimer_cancel(&iprtd->hrt);
143 if (--fiq_enable == 0)
144 disable_fiq(imx_pcm_fiq);
155 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
157 struct snd_pcm_runtime *runtime = substream->runtime;
158 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
160 return bytes_to_frames(substream->runtime, iprtd->offset);
163 static struct snd_pcm_hardware snd_imx_hardware = {
164 .info = SNDRV_PCM_INFO_INTERLEAVED |
165 SNDRV_PCM_INFO_BLOCK_TRANSFER |
166 SNDRV_PCM_INFO_MMAP |
167 SNDRV_PCM_INFO_MMAP_VALID |
168 SNDRV_PCM_INFO_PAUSE |
169 SNDRV_PCM_INFO_RESUME,
170 .formats = SNDRV_PCM_FMTBIT_S16_LE,
174 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
175 .period_bytes_min = 128,
176 .period_bytes_max = 16 * 1024,
182 static int snd_imx_open(struct snd_pcm_substream *substream)
184 struct snd_pcm_runtime *runtime = substream->runtime;
185 struct imx_pcm_runtime_data *iprtd;
188 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
189 runtime->private_data = iprtd;
191 iprtd->substream = substream;
193 hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
194 iprtd->hrt.function = snd_hrtimer_callback;
196 ret = snd_pcm_hw_constraint_integer(substream->runtime,
197 SNDRV_PCM_HW_PARAM_PERIODS);
201 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
205 static int snd_imx_close(struct snd_pcm_substream *substream)
207 struct snd_pcm_runtime *runtime = substream->runtime;
208 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
210 hrtimer_cancel(&iprtd->hrt);
217 static struct snd_pcm_ops imx_pcm_ops = {
218 .open = snd_imx_open,
219 .close = snd_imx_close,
220 .ioctl = snd_pcm_lib_ioctl,
221 .hw_params = snd_imx_pcm_hw_params,
222 .prepare = snd_imx_pcm_prepare,
223 .trigger = snd_imx_pcm_trigger,
224 .pointer = snd_imx_pcm_pointer,
225 .mmap = snd_imx_pcm_mmap,
228 static int imx_pcm_fiq_new(struct snd_card *card, struct snd_soc_dai *dai,
233 ret = imx_pcm_new(card, dai, pcm);
237 if (dai->playback.channels_min) {
238 struct snd_pcm_substream *substream =
239 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
240 struct snd_dma_buffer *buf = &substream->dma_buffer;
242 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
245 if (dai->capture.channels_min) {
246 struct snd_pcm_substream *substream =
247 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
248 struct snd_dma_buffer *buf = &substream->dma_buffer;
250 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
253 set_fiq_handler(&imx_ssi_fiq_start,
254 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
259 static struct snd_soc_platform imx_soc_platform_fiq = {
260 .pcm_ops = &imx_pcm_ops,
261 .pcm_new = imx_pcm_fiq_new,
262 .pcm_free = imx_pcm_free,
265 struct snd_soc_platform *imx_ssi_fiq_init(struct platform_device *pdev,
270 ret = claim_fiq(&fh);
272 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
276 mxc_set_irq_fiq(ssi->irq, 1);
278 imx_pcm_fiq = ssi->irq;
280 imx_ssi_fiq_base = (unsigned long)ssi->base;
282 ssi->dma_params_tx.burstsize = 4;
283 ssi->dma_params_rx.burstsize = 6;
285 return &imx_soc_platform_fiq;
288 void imx_ssi_fiq_exit(struct platform_device *pdev,
291 mxc_set_irq_fiq(ssi->irq, 0);