1/* 2 * imx-pcm-fiq.c -- ALSA Soc Audio Layer 3 * 4 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de> 5 * 6 * This code is based on code copyrighted by Freescale, 7 * Liam Girdwood, Javier Martin and probably others. 8 * 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. 13 */ 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> 23 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> 29 30#include <asm/fiq.h> 31 32#include <mach/ssi.h> 33 34#include "imx-ssi.h" 35 36struct imx_pcm_runtime_data { 37 int period; 38 int periods; 39 unsigned long offset; 40 unsigned long last_offset; 41 unsigned long size; 42 struct hrtimer hrt; 43 int poll_time_ns; 44 struct snd_pcm_substream *substream; 45 atomic_t running; 46}; 47 48static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt) 49{ 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; 54 struct pt_regs regs; 55 unsigned long delta; 56 57 if (!atomic_read(&iprtd->running)) 58 return HRTIMER_NORESTART; 59 60 get_fiq_regs(®s); 61 62 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 63 iprtd->offset = regs.ARM_r8 & 0xffff; 64 else 65 iprtd->offset = regs.ARM_r9 & 0xffff; 66 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; 70 else 71 delta = runtime->buffer_size + iprtd->offset 72 - iprtd->last_offset; 73 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; 79 } 80 81 hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns)); 82 83 return HRTIMER_RESTART; 84} 85 86static struct fiq_handler fh = { 87 .name = DRV_NAME, 88}; 89 90static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream, 91 struct snd_pcm_hw_params *params) 92{ 93 struct snd_pcm_runtime *runtime = substream->runtime; 94 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 95 96 iprtd->size = params_buffer_bytes(params); 97 iprtd->periods = params_periods(params); 98 iprtd->period = params_period_bytes(params) ; 99 iprtd->offset = 0; 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); 104 105 return 0; 106} 107 108static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream) 109{ 110 struct snd_pcm_runtime *runtime = substream->runtime; 111 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 112 struct pt_regs regs; 113 114 get_fiq_regs(®s); 115 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 116 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16; 117 else 118 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16; 119 120 set_fiq_regs(®s); 121 122 return 0; 123} 124 125static int fiq_enable; 126static int imx_pcm_fiq; 127 128static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 129{ 130 struct snd_pcm_runtime *runtime = substream->runtime; 131 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 132 133 switch (cmd) { 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), 139 HRTIMER_MODE_REL); 140 if (++fiq_enable == 1) 141 enable_fiq(imx_pcm_fiq); 142 143 break; 144 145 case SNDRV_PCM_TRIGGER_STOP: 146 case SNDRV_PCM_TRIGGER_SUSPEND: 147 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 148 atomic_set(&iprtd->running, 0); 149 150 if (--fiq_enable == 0) 151 disable_fiq(imx_pcm_fiq); 152 153 break; 154 default: 155 return -EINVAL; 156 } 157 158 return 0; 159} 160 161static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream) 162{ 163 struct snd_pcm_runtime *runtime = substream->runtime; 164 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 165 166 return bytes_to_frames(substream->runtime, iprtd->offset); 167} 168 169static 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, 177 .rate_min = 8000, 178 .channels_min = 2, 179 .channels_max = 2, 180 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, 181 .period_bytes_min = 128, 182 .period_bytes_max = 16 * 1024, 183 .periods_min = 4, 184 .periods_max = 255, 185 .fifo_size = 0, 186}; 187 188static int snd_imx_open(struct snd_pcm_substream *substream) 189{ 190 struct snd_pcm_runtime *runtime = substream->runtime; 191 struct imx_pcm_runtime_data *iprtd; 192 int ret; 193 194 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); 195 if (iprtd == NULL) 196 return -ENOMEM; 197 runtime->private_data = iprtd; 198 199 iprtd->substream = substream; 200 201 atomic_set(&iprtd->running, 0); 202 hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 203 iprtd->hrt.function = snd_hrtimer_callback; 204 205 ret = snd_pcm_hw_constraint_integer(substream->runtime, 206 SNDRV_PCM_HW_PARAM_PERIODS); 207 if (ret < 0) { 208 kfree(iprtd); 209 return ret; 210 } 211 212 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); 213 return 0; 214} 215 216static int snd_imx_close(struct snd_pcm_substream *substream) 217{ 218 struct snd_pcm_runtime *runtime = substream->runtime; 219 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 220 221 hrtimer_cancel(&iprtd->hrt); 222 223 kfree(iprtd); 224 225 return 0; 226} 227 228static 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, 237}; 238 239static int imx_pcm_fiq_new(struct snd_card *card, struct snd_soc_dai *dai, 240 struct snd_pcm *pcm) 241{ 242 int ret; 243 244 ret = imx_pcm_new(card, dai, pcm); 245 if (ret) 246 return ret; 247 248 if (dai->playback.channels_min) { 249 struct snd_pcm_substream *substream = 250 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; 251 struct snd_dma_buffer *buf = &substream->dma_buffer; 252 253 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; 254 } 255 256 if (dai->capture.channels_min) { 257 struct snd_pcm_substream *substream = 258 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; 259 struct snd_dma_buffer *buf = &substream->dma_buffer; 260 261 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; 262 } 263 264 set_fiq_handler(&imx_ssi_fiq_start, 265 &imx_ssi_fiq_end - &imx_ssi_fiq_start); 266 267 return 0; 268} 269 270static struct snd_soc_platform imx_soc_platform_fiq = { 271 .pcm_ops = &imx_pcm_ops, 272 .pcm_new = imx_pcm_fiq_new, 273 .pcm_free = imx_pcm_free, 274}; 275 276struct snd_soc_platform *imx_ssi_fiq_init(struct platform_device *pdev, 277 struct imx_ssi *ssi) 278{ 279 int ret = 0; 280 281 ret = claim_fiq(&fh); 282 if (ret) { 283 dev_err(&pdev->dev, "failed to claim fiq: %d", ret); 284 return ERR_PTR(ret); 285 } 286 287 mxc_set_irq_fiq(ssi->irq, 1); 288 289 imx_pcm_fiq = ssi->irq; 290 291 imx_ssi_fiq_base = (unsigned long)ssi->base; 292 293 ssi->dma_params_tx.burstsize = 4; 294 ssi->dma_params_rx.burstsize = 6; 295 296 return &imx_soc_platform_fiq; 297} 298 299void imx_ssi_fiq_exit(struct platform_device *pdev, 300 struct imx_ssi *ssi) 301{ 302 mxc_set_irq_fiq(ssi->irq, 0); 303 release_fiq(&fh); 304} 305