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/initval.h>
26 #include <sound/pcm.h>
27 #include <sound/pcm_params.h>
28 #include <sound/soc.h>
32 #include <linux/platform_data/asoc-imx-ssi.h>
36 struct imx_pcm_runtime_data {
40 unsigned long last_offset;
44 struct snd_pcm_substream *substream;
49 static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
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;
54 struct snd_pcm_runtime *runtime = substream->runtime;
58 if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing))
59 return HRTIMER_NORESTART;
63 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
64 iprtd->offset = regs.ARM_r8 & 0xffff;
66 iprtd->offset = regs.ARM_r9 & 0xffff;
68 /* How much data have we transferred since the last period report? */
69 if (iprtd->offset >= iprtd->last_offset)
70 delta = iprtd->offset - iprtd->last_offset;
72 delta = runtime->buffer_size + iprtd->offset
75 /* If we've transferred at least a period then report it and
76 * reset our poll time */
77 if (delta >= iprtd->period) {
78 snd_pcm_period_elapsed(substream);
79 iprtd->last_offset = iprtd->offset;
82 hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
84 return HRTIMER_RESTART;
87 static struct fiq_handler fh = {
91 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
92 struct snd_pcm_hw_params *params)
94 struct snd_pcm_runtime *runtime = substream->runtime;
95 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
97 iprtd->size = params_buffer_bytes(params);
98 iprtd->periods = params_periods(params);
99 iprtd->period = params_period_bytes(params) ;
101 iprtd->last_offset = 0;
102 iprtd->poll_time_ns = 1000000000 / params_rate(params) *
103 params_period_size(params);
104 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
109 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
111 struct snd_pcm_runtime *runtime = substream->runtime;
112 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
116 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
117 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
119 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
126 static int imx_pcm_fiq;
128 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
130 struct snd_pcm_runtime *runtime = substream->runtime;
131 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
134 case SNDRV_PCM_TRIGGER_START:
135 case SNDRV_PCM_TRIGGER_RESUME:
136 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
137 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
138 atomic_set(&iprtd->playing, 1);
140 atomic_set(&iprtd->capturing, 1);
141 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
143 enable_fiq(imx_pcm_fiq);
146 case SNDRV_PCM_TRIGGER_STOP:
147 case SNDRV_PCM_TRIGGER_SUSPEND:
148 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
149 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
150 atomic_set(&iprtd->playing, 0);
152 atomic_set(&iprtd->capturing, 0);
153 if (!atomic_read(&iprtd->playing) &&
154 !atomic_read(&iprtd->capturing))
155 disable_fiq(imx_pcm_fiq);
165 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
167 struct snd_pcm_runtime *runtime = substream->runtime;
168 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
170 return bytes_to_frames(substream->runtime, iprtd->offset);
173 static struct snd_pcm_hardware snd_imx_hardware = {
174 .info = SNDRV_PCM_INFO_INTERLEAVED |
175 SNDRV_PCM_INFO_BLOCK_TRANSFER |
176 SNDRV_PCM_INFO_MMAP |
177 SNDRV_PCM_INFO_MMAP_VALID |
178 SNDRV_PCM_INFO_PAUSE |
179 SNDRV_PCM_INFO_RESUME,
180 .formats = SNDRV_PCM_FMTBIT_S16_LE,
184 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
185 .period_bytes_min = 128,
186 .period_bytes_max = 16 * 1024,
192 static int snd_imx_open(struct snd_pcm_substream *substream)
194 struct snd_pcm_runtime *runtime = substream->runtime;
195 struct imx_pcm_runtime_data *iprtd;
198 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
201 runtime->private_data = iprtd;
203 iprtd->substream = substream;
205 atomic_set(&iprtd->playing, 0);
206 atomic_set(&iprtd->capturing, 0);
207 hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
208 iprtd->hrt.function = snd_hrtimer_callback;
210 ret = snd_pcm_hw_constraint_integer(substream->runtime,
211 SNDRV_PCM_HW_PARAM_PERIODS);
217 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
221 static int snd_imx_close(struct snd_pcm_substream *substream)
223 struct snd_pcm_runtime *runtime = substream->runtime;
224 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
226 hrtimer_cancel(&iprtd->hrt);
233 static struct snd_pcm_ops imx_pcm_ops = {
234 .open = snd_imx_open,
235 .close = snd_imx_close,
236 .ioctl = snd_pcm_lib_ioctl,
237 .hw_params = snd_imx_pcm_hw_params,
238 .prepare = snd_imx_pcm_prepare,
239 .trigger = snd_imx_pcm_trigger,
240 .pointer = snd_imx_pcm_pointer,
241 .mmap = snd_imx_pcm_mmap,
244 static int ssi_irq = 0;
246 static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
248 struct snd_pcm *pcm = rtd->pcm;
249 struct snd_pcm_substream *substream;
252 ret = imx_pcm_new(rtd);
256 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
258 struct snd_dma_buffer *buf = &substream->dma_buffer;
260 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
263 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
265 struct snd_dma_buffer *buf = &substream->dma_buffer;
267 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
270 set_fiq_handler(&imx_ssi_fiq_start,
271 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
276 static void imx_pcm_fiq_free(struct snd_pcm *pcm)
278 mxc_set_irq_fiq(ssi_irq, 0);
283 static struct snd_soc_platform_driver imx_soc_platform_fiq = {
285 .pcm_new = imx_pcm_fiq_new,
286 .pcm_free = imx_pcm_fiq_free,
289 int imx_pcm_fiq_init(struct platform_device *pdev)
291 struct imx_ssi *ssi = platform_get_drvdata(pdev);
294 ret = claim_fiq(&fh);
296 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
300 mxc_set_irq_fiq(ssi->irq, 1);
303 imx_pcm_fiq = ssi->irq;
305 imx_ssi_fiq_base = (unsigned long)ssi->base;
307 ssi->dma_params_tx.maxburst = 4;
308 ssi->dma_params_rx.maxburst = 6;
310 ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
312 goto failed_register;
317 mxc_set_irq_fiq(ssi_irq, 0);