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 <linux/platform_data/asoc-imx-ssi.h> 33 34 #include "imx-ssi.h" 35 36 struct 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 48 static 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 86 static struct fiq_handler fh = { 87 .name = DRV_NAME, 88 }; 89 90 static 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 } 107 108 static 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 } 124 125 static int fiq_enable; 126 static int imx_pcm_fiq; 127 128 static 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 } 160 161 static 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 } 168 169 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, 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 }; 187 188 static 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 } 215 216 static 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 } 227 228 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, 237 }; 238 239 static int ssi_irq = 0; 240 241 static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd) 242 { 243 struct snd_pcm *pcm = rtd->pcm; 244 struct snd_pcm_substream *substream; 245 int ret; 246 247 ret = imx_pcm_new(rtd); 248 if (ret) 249 return ret; 250 251 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; 252 if (substream) { 253 struct snd_dma_buffer *buf = &substream->dma_buffer; 254 255 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; 256 } 257 258 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; 259 if (substream) { 260 struct snd_dma_buffer *buf = &substream->dma_buffer; 261 262 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; 263 } 264 265 set_fiq_handler(&imx_ssi_fiq_start, 266 &imx_ssi_fiq_end - &imx_ssi_fiq_start); 267 268 return 0; 269 } 270 271 static void imx_pcm_fiq_free(struct snd_pcm *pcm) 272 { 273 mxc_set_irq_fiq(ssi_irq, 0); 274 release_fiq(&fh); 275 imx_pcm_free(pcm); 276 } 277 278 static struct snd_soc_platform_driver imx_soc_platform_fiq = { 279 .ops = &imx_pcm_ops, 280 .pcm_new = imx_pcm_fiq_new, 281 .pcm_free = imx_pcm_fiq_free, 282 }; 283 284 int imx_pcm_fiq_init(struct platform_device *pdev) 285 { 286 struct imx_ssi *ssi = platform_get_drvdata(pdev); 287 int ret; 288 289 ret = claim_fiq(&fh); 290 if (ret) { 291 dev_err(&pdev->dev, "failed to claim fiq: %d", ret); 292 return ret; 293 } 294 295 mxc_set_irq_fiq(ssi->irq, 1); 296 ssi_irq = ssi->irq; 297 298 imx_pcm_fiq = ssi->irq; 299 300 imx_ssi_fiq_base = (unsigned long)ssi->base; 301 302 ssi->dma_params_tx.burstsize = 4; 303 ssi->dma_params_rx.burstsize = 6; 304 305 ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq); 306 if (ret) 307 goto failed_register; 308 309 return 0; 310 311 failed_register: 312 mxc_set_irq_fiq(ssi_irq, 0); 313 release_fiq(&fh); 314 315 return ret; 316 } 317