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>
36 struct imx_pcm_runtime_data {
40 unsigned long last_offset;
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;
53 struct snd_pcm_runtime *runtime = substream->runtime;
57 if (!atomic_read(&iprtd->running))
58 return HRTIMER_NORESTART;
62 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
63 iprtd->offset = regs.ARM_r8 & 0xffff;
65 iprtd->offset = regs.ARM_r9 & 0xffff;
67 /* How much data have we transferred since the last period report? */
68 if (iprtd->offset >= iprtd->last_offset)
69 delta = iprtd->offset - iprtd->last_offset;
71 delta = runtime->buffer_size + iprtd->offset
74 /* If we've transferred at least a period then report it and
75 * reset our poll time */
76 if (delta >= iprtd->period) {
77 snd_pcm_period_elapsed(substream);
78 iprtd->last_offset = iprtd->offset;
81 hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
83 return HRTIMER_RESTART;
86 static struct fiq_handler fh = {
90 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
91 struct snd_pcm_hw_params *params)
93 struct snd_pcm_runtime *runtime = substream->runtime;
94 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
96 iprtd->size = params_buffer_bytes(params);
97 iprtd->periods = params_periods(params);
98 iprtd->period = params_period_bytes(params) ;
100 iprtd->last_offset = 0;
101 iprtd->poll_time_ns = 1000000000 / params_rate(params) *
102 params_period_size(params);
103 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
108 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
110 struct snd_pcm_runtime *runtime = substream->runtime;
111 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
115 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
116 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
118 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
125 static int fiq_enable;
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 atomic_set(&iprtd->running, 1);
138 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
140 if (++fiq_enable == 1)
141 enable_fiq(imx_pcm_fiq);
145 case SNDRV_PCM_TRIGGER_STOP:
146 case SNDRV_PCM_TRIGGER_SUSPEND:
147 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
148 atomic_set(&iprtd->running, 0);
150 if (--fiq_enable == 0)
151 disable_fiq(imx_pcm_fiq);
161 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
163 struct snd_pcm_runtime *runtime = substream->runtime;
164 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
166 return bytes_to_frames(substream->runtime, iprtd->offset);
169 static struct snd_pcm_hardware snd_imx_hardware = {
170 .info = SNDRV_PCM_INFO_INTERLEAVED |
171 SNDRV_PCM_INFO_BLOCK_TRANSFER |
172 SNDRV_PCM_INFO_MMAP |
173 SNDRV_PCM_INFO_MMAP_VALID |
174 SNDRV_PCM_INFO_PAUSE |
175 SNDRV_PCM_INFO_RESUME,
176 .formats = SNDRV_PCM_FMTBIT_S16_LE,
180 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
181 .period_bytes_min = 128,
182 .period_bytes_max = 16 * 1024,
188 static int snd_imx_open(struct snd_pcm_substream *substream)
190 struct snd_pcm_runtime *runtime = substream->runtime;
191 struct imx_pcm_runtime_data *iprtd;
194 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
197 runtime->private_data = iprtd;
199 iprtd->substream = substream;
201 atomic_set(&iprtd->running, 0);
202 hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
203 iprtd->hrt.function = snd_hrtimer_callback;
205 ret = snd_pcm_hw_constraint_integer(substream->runtime,
206 SNDRV_PCM_HW_PARAM_PERIODS);
212 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
216 static int snd_imx_close(struct snd_pcm_substream *substream)
218 struct snd_pcm_runtime *runtime = substream->runtime;
219 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
221 hrtimer_cancel(&iprtd->hrt);
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 ssi_irq = 0;
241 static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
243 struct snd_pcm *pcm = rtd->pcm;
244 struct snd_pcm_substream *substream;
247 ret = imx_pcm_new(rtd);
251 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
253 struct snd_dma_buffer *buf = &substream->dma_buffer;
255 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
258 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
260 struct snd_dma_buffer *buf = &substream->dma_buffer;
262 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
265 set_fiq_handler(&imx_ssi_fiq_start,
266 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
271 static void imx_pcm_fiq_free(struct snd_pcm *pcm)
273 mxc_set_irq_fiq(ssi_irq, 0);
278 static struct snd_soc_platform_driver imx_soc_platform_fiq = {
280 .pcm_new = imx_pcm_fiq_new,
281 .pcm_free = imx_pcm_fiq_free,
284 static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
286 struct imx_ssi *ssi = platform_get_drvdata(pdev);
289 ret = claim_fiq(&fh);
291 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
295 mxc_set_irq_fiq(ssi->irq, 1);
298 imx_pcm_fiq = ssi->irq;
300 imx_ssi_fiq_base = (unsigned long)ssi->base;
302 ssi->dma_params_tx.burstsize = 4;
303 ssi->dma_params_rx.burstsize = 6;
305 ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
307 goto failed_register;
312 mxc_set_irq_fiq(ssi_irq, 0);
318 static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
320 snd_soc_unregister_platform(&pdev->dev);
324 static struct platform_driver imx_pcm_driver = {
326 .name = "imx-fiq-pcm-audio",
327 .owner = THIS_MODULE,
330 .probe = imx_soc_platform_probe,
331 .remove = __devexit_p(imx_soc_platform_remove),
334 static int __init snd_imx_pcm_init(void)
336 return platform_driver_register(&imx_pcm_driver);
338 module_init(snd_imx_pcm_init);
340 static void __exit snd_imx_pcm_exit(void)
342 platform_driver_unregister(&imx_pcm_driver);
344 module_exit(snd_imx_pcm_exit);