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/dmaengine_pcm.h> 26 #include <sound/initval.h> 27 #include <sound/pcm.h> 28 #include <sound/pcm_params.h> 29 #include <sound/soc.h> 30 31 #include <asm/fiq.h> 32 33 #include <linux/platform_data/asoc-imx-ssi.h> 34 35 #include "imx-ssi.h" 36 #include "imx-pcm.h" 37 38 struct imx_pcm_runtime_data { 39 unsigned int period; 40 int periods; 41 unsigned long offset; 42 struct hrtimer hrt; 43 int poll_time_ns; 44 struct snd_pcm_substream *substream; 45 atomic_t playing; 46 atomic_t capturing; 47 }; 48 49 static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt) 50 { 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 pt_regs regs; 55 56 if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing)) 57 return HRTIMER_NORESTART; 58 59 get_fiq_regs(®s); 60 61 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 62 iprtd->offset = regs.ARM_r8 & 0xffff; 63 else 64 iprtd->offset = regs.ARM_r9 & 0xffff; 65 66 snd_pcm_period_elapsed(substream); 67 68 hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns)); 69 70 return HRTIMER_RESTART; 71 } 72 73 static struct fiq_handler fh = { 74 .name = DRV_NAME, 75 }; 76 77 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream, 78 struct snd_pcm_hw_params *params) 79 { 80 struct snd_pcm_runtime *runtime = substream->runtime; 81 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 82 83 iprtd->periods = params_periods(params); 84 iprtd->period = params_period_bytes(params); 85 iprtd->offset = 0; 86 iprtd->poll_time_ns = 1000000000 / params_rate(params) * 87 params_period_size(params); 88 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 89 90 return 0; 91 } 92 93 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream) 94 { 95 struct snd_pcm_runtime *runtime = substream->runtime; 96 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 97 struct pt_regs regs; 98 99 get_fiq_regs(®s); 100 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 101 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16; 102 else 103 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16; 104 105 set_fiq_regs(®s); 106 107 return 0; 108 } 109 110 static int imx_pcm_fiq; 111 112 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 113 { 114 struct snd_pcm_runtime *runtime = substream->runtime; 115 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 116 117 switch (cmd) { 118 case SNDRV_PCM_TRIGGER_START: 119 case SNDRV_PCM_TRIGGER_RESUME: 120 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 121 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 122 atomic_set(&iprtd->playing, 1); 123 else 124 atomic_set(&iprtd->capturing, 1); 125 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns), 126 HRTIMER_MODE_REL); 127 enable_fiq(imx_pcm_fiq); 128 break; 129 130 case SNDRV_PCM_TRIGGER_STOP: 131 case SNDRV_PCM_TRIGGER_SUSPEND: 132 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 133 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 134 atomic_set(&iprtd->playing, 0); 135 else 136 atomic_set(&iprtd->capturing, 0); 137 if (!atomic_read(&iprtd->playing) && 138 !atomic_read(&iprtd->capturing)) 139 disable_fiq(imx_pcm_fiq); 140 break; 141 142 default: 143 return -EINVAL; 144 } 145 146 return 0; 147 } 148 149 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream) 150 { 151 struct snd_pcm_runtime *runtime = substream->runtime; 152 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 153 154 return bytes_to_frames(substream->runtime, iprtd->offset); 155 } 156 157 static struct snd_pcm_hardware snd_imx_hardware = { 158 .info = SNDRV_PCM_INFO_INTERLEAVED | 159 SNDRV_PCM_INFO_BLOCK_TRANSFER | 160 SNDRV_PCM_INFO_MMAP | 161 SNDRV_PCM_INFO_MMAP_VALID | 162 SNDRV_PCM_INFO_PAUSE | 163 SNDRV_PCM_INFO_RESUME, 164 .formats = SNDRV_PCM_FMTBIT_S16_LE, 165 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, 166 .period_bytes_min = 128, 167 .period_bytes_max = 16 * 1024, 168 .periods_min = 4, 169 .periods_max = 255, 170 .fifo_size = 0, 171 }; 172 173 static int snd_imx_open(struct snd_pcm_substream *substream) 174 { 175 struct snd_pcm_runtime *runtime = substream->runtime; 176 struct imx_pcm_runtime_data *iprtd; 177 int ret; 178 179 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); 180 if (iprtd == NULL) 181 return -ENOMEM; 182 runtime->private_data = iprtd; 183 184 iprtd->substream = substream; 185 186 atomic_set(&iprtd->playing, 0); 187 atomic_set(&iprtd->capturing, 0); 188 hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 189 iprtd->hrt.function = snd_hrtimer_callback; 190 191 ret = snd_pcm_hw_constraint_integer(substream->runtime, 192 SNDRV_PCM_HW_PARAM_PERIODS); 193 if (ret < 0) { 194 kfree(iprtd); 195 return ret; 196 } 197 198 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); 199 return 0; 200 } 201 202 static int snd_imx_close(struct snd_pcm_substream *substream) 203 { 204 struct snd_pcm_runtime *runtime = substream->runtime; 205 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 206 207 hrtimer_cancel(&iprtd->hrt); 208 209 kfree(iprtd); 210 211 return 0; 212 } 213 214 static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream, 215 struct vm_area_struct *vma) 216 { 217 struct snd_pcm_runtime *runtime = substream->runtime; 218 int ret; 219 220 ret = dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area, 221 runtime->dma_addr, runtime->dma_bytes); 222 223 pr_debug("%s: ret: %d %p %pad 0x%08zx\n", __func__, ret, 224 runtime->dma_area, 225 &runtime->dma_addr, 226 runtime->dma_bytes); 227 return ret; 228 } 229 230 static struct snd_pcm_ops imx_pcm_ops = { 231 .open = snd_imx_open, 232 .close = snd_imx_close, 233 .ioctl = snd_pcm_lib_ioctl, 234 .hw_params = snd_imx_pcm_hw_params, 235 .prepare = snd_imx_pcm_prepare, 236 .trigger = snd_imx_pcm_trigger, 237 .pointer = snd_imx_pcm_pointer, 238 .mmap = snd_imx_pcm_mmap, 239 }; 240 241 static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) 242 { 243 struct snd_pcm_substream *substream = pcm->streams[stream].substream; 244 struct snd_dma_buffer *buf = &substream->dma_buffer; 245 size_t size = IMX_SSI_DMABUF_SIZE; 246 247 buf->dev.type = SNDRV_DMA_TYPE_DEV; 248 buf->dev.dev = pcm->card->dev; 249 buf->private_data = NULL; 250 buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL); 251 if (!buf->area) 252 return -ENOMEM; 253 buf->bytes = size; 254 255 return 0; 256 } 257 258 static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd) 259 { 260 struct snd_card *card = rtd->card->snd_card; 261 struct snd_pcm *pcm = rtd->pcm; 262 int ret; 263 264 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 265 if (ret) 266 return ret; 267 268 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 269 ret = imx_pcm_preallocate_dma_buffer(pcm, 270 SNDRV_PCM_STREAM_PLAYBACK); 271 if (ret) 272 return ret; 273 } 274 275 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 276 ret = imx_pcm_preallocate_dma_buffer(pcm, 277 SNDRV_PCM_STREAM_CAPTURE); 278 if (ret) 279 return ret; 280 } 281 282 return 0; 283 } 284 285 static int ssi_irq; 286 287 static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd) 288 { 289 struct snd_pcm *pcm = rtd->pcm; 290 struct snd_pcm_substream *substream; 291 int ret; 292 293 ret = imx_pcm_new(rtd); 294 if (ret) 295 return ret; 296 297 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; 298 if (substream) { 299 struct snd_dma_buffer *buf = &substream->dma_buffer; 300 301 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; 302 } 303 304 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; 305 if (substream) { 306 struct snd_dma_buffer *buf = &substream->dma_buffer; 307 308 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; 309 } 310 311 set_fiq_handler(&imx_ssi_fiq_start, 312 &imx_ssi_fiq_end - &imx_ssi_fiq_start); 313 314 return 0; 315 } 316 317 static void imx_pcm_free(struct snd_pcm *pcm) 318 { 319 struct snd_pcm_substream *substream; 320 struct snd_dma_buffer *buf; 321 int stream; 322 323 for (stream = 0; stream < 2; stream++) { 324 substream = pcm->streams[stream].substream; 325 if (!substream) 326 continue; 327 328 buf = &substream->dma_buffer; 329 if (!buf->area) 330 continue; 331 332 dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr); 333 buf->area = NULL; 334 } 335 } 336 337 static void imx_pcm_fiq_free(struct snd_pcm *pcm) 338 { 339 mxc_set_irq_fiq(ssi_irq, 0); 340 release_fiq(&fh); 341 imx_pcm_free(pcm); 342 } 343 344 static struct snd_soc_platform_driver imx_soc_platform_fiq = { 345 .ops = &imx_pcm_ops, 346 .pcm_new = imx_pcm_fiq_new, 347 .pcm_free = imx_pcm_fiq_free, 348 }; 349 350 int imx_pcm_fiq_init(struct platform_device *pdev, 351 struct imx_pcm_fiq_params *params) 352 { 353 int ret; 354 355 ret = claim_fiq(&fh); 356 if (ret) { 357 dev_err(&pdev->dev, "failed to claim fiq: %d", ret); 358 return ret; 359 } 360 361 mxc_set_irq_fiq(params->irq, 1); 362 ssi_irq = params->irq; 363 364 imx_pcm_fiq = params->irq; 365 366 imx_ssi_fiq_base = (unsigned long)params->base; 367 368 params->dma_params_tx->maxburst = 4; 369 params->dma_params_rx->maxburst = 6; 370 371 ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq); 372 if (ret) 373 goto failed_register; 374 375 return 0; 376 377 failed_register: 378 mxc_set_irq_fiq(ssi_irq, 0); 379 release_fiq(&fh); 380 381 return ret; 382 } 383 EXPORT_SYMBOL_GPL(imx_pcm_fiq_init); 384 385 void imx_pcm_fiq_exit(struct platform_device *pdev) 386 { 387 snd_soc_unregister_platform(&pdev->dev); 388 } 389 EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit); 390 391 MODULE_LICENSE("GPL"); 392