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 unsigned long last_offset; 43 unsigned long size; 44 struct hrtimer hrt; 45 int poll_time_ns; 46 struct snd_pcm_substream *substream; 47 atomic_t running; 48 }; 49 50 static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt) 51 { 52 struct imx_pcm_runtime_data *iprtd = 53 container_of(hrt, struct imx_pcm_runtime_data, hrt); 54 struct snd_pcm_substream *substream = iprtd->substream; 55 struct snd_pcm_runtime *runtime = substream->runtime; 56 struct pt_regs regs; 57 unsigned long delta; 58 59 if (!atomic_read(&iprtd->running)) 60 return HRTIMER_NORESTART; 61 62 get_fiq_regs(®s); 63 64 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 65 iprtd->offset = regs.ARM_r8 & 0xffff; 66 else 67 iprtd->offset = regs.ARM_r9 & 0xffff; 68 69 /* How much data have we transferred since the last period report? */ 70 if (iprtd->offset >= iprtd->last_offset) 71 delta = iprtd->offset - iprtd->last_offset; 72 else 73 delta = runtime->buffer_size + iprtd->offset 74 - iprtd->last_offset; 75 76 /* If we've transferred at least a period then report it and 77 * reset our poll time */ 78 if (delta >= iprtd->period) { 79 snd_pcm_period_elapsed(substream); 80 iprtd->last_offset = iprtd->offset; 81 } 82 83 hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns)); 84 85 return HRTIMER_RESTART; 86 } 87 88 static struct fiq_handler fh = { 89 .name = DRV_NAME, 90 }; 91 92 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream, 93 struct snd_pcm_hw_params *params) 94 { 95 struct snd_pcm_runtime *runtime = substream->runtime; 96 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 97 98 iprtd->size = params_buffer_bytes(params); 99 iprtd->periods = params_periods(params); 100 iprtd->period = params_period_bytes(params) ; 101 iprtd->offset = 0; 102 iprtd->last_offset = 0; 103 iprtd->poll_time_ns = 1000000000 / params_rate(params) * 104 params_period_size(params); 105 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 106 107 return 0; 108 } 109 110 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream) 111 { 112 struct snd_pcm_runtime *runtime = substream->runtime; 113 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 114 struct pt_regs regs; 115 116 get_fiq_regs(®s); 117 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 118 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16; 119 else 120 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16; 121 122 set_fiq_regs(®s); 123 124 return 0; 125 } 126 127 static int fiq_enable; 128 static int imx_pcm_fiq; 129 130 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 131 { 132 struct snd_pcm_runtime *runtime = substream->runtime; 133 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 134 135 switch (cmd) { 136 case SNDRV_PCM_TRIGGER_START: 137 case SNDRV_PCM_TRIGGER_RESUME: 138 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 139 atomic_set(&iprtd->running, 1); 140 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns), 141 HRTIMER_MODE_REL); 142 if (++fiq_enable == 1) 143 enable_fiq(imx_pcm_fiq); 144 145 break; 146 147 case SNDRV_PCM_TRIGGER_STOP: 148 case SNDRV_PCM_TRIGGER_SUSPEND: 149 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 150 atomic_set(&iprtd->running, 0); 151 152 if (--fiq_enable == 0) 153 disable_fiq(imx_pcm_fiq); 154 155 break; 156 default: 157 return -EINVAL; 158 } 159 160 return 0; 161 } 162 163 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream) 164 { 165 struct snd_pcm_runtime *runtime = substream->runtime; 166 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 167 168 return bytes_to_frames(substream->runtime, iprtd->offset); 169 } 170 171 static struct snd_pcm_hardware snd_imx_hardware = { 172 .info = SNDRV_PCM_INFO_INTERLEAVED | 173 SNDRV_PCM_INFO_BLOCK_TRANSFER | 174 SNDRV_PCM_INFO_MMAP | 175 SNDRV_PCM_INFO_MMAP_VALID | 176 SNDRV_PCM_INFO_PAUSE | 177 SNDRV_PCM_INFO_RESUME, 178 .formats = SNDRV_PCM_FMTBIT_S16_LE, 179 .rate_min = 8000, 180 .channels_min = 2, 181 .channels_max = 2, 182 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, 183 .period_bytes_min = 128, 184 .period_bytes_max = 16 * 1024, 185 .periods_min = 4, 186 .periods_max = 255, 187 .fifo_size = 0, 188 }; 189 190 static int snd_imx_open(struct snd_pcm_substream *substream) 191 { 192 struct snd_pcm_runtime *runtime = substream->runtime; 193 struct imx_pcm_runtime_data *iprtd; 194 int ret; 195 196 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); 197 if (iprtd == NULL) 198 return -ENOMEM; 199 runtime->private_data = iprtd; 200 201 iprtd->substream = substream; 202 203 atomic_set(&iprtd->running, 0); 204 hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 205 iprtd->hrt.function = snd_hrtimer_callback; 206 207 ret = snd_pcm_hw_constraint_integer(substream->runtime, 208 SNDRV_PCM_HW_PARAM_PERIODS); 209 if (ret < 0) { 210 kfree(iprtd); 211 return ret; 212 } 213 214 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); 215 return 0; 216 } 217 218 static int snd_imx_close(struct snd_pcm_substream *substream) 219 { 220 struct snd_pcm_runtime *runtime = substream->runtime; 221 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 222 223 hrtimer_cancel(&iprtd->hrt); 224 225 kfree(iprtd); 226 227 return 0; 228 } 229 230 static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream, 231 struct vm_area_struct *vma) 232 { 233 struct snd_pcm_runtime *runtime = substream->runtime; 234 int ret; 235 236 ret = dma_mmap_writecombine(substream->pcm->card->dev, vma, 237 runtime->dma_area, runtime->dma_addr, runtime->dma_bytes); 238 239 pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret, 240 runtime->dma_area, 241 runtime->dma_addr, 242 runtime->dma_bytes); 243 return ret; 244 } 245 246 static struct snd_pcm_ops imx_pcm_ops = { 247 .open = snd_imx_open, 248 .close = snd_imx_close, 249 .ioctl = snd_pcm_lib_ioctl, 250 .hw_params = snd_imx_pcm_hw_params, 251 .prepare = snd_imx_pcm_prepare, 252 .trigger = snd_imx_pcm_trigger, 253 .pointer = snd_imx_pcm_pointer, 254 .mmap = snd_imx_pcm_mmap, 255 }; 256 257 static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) 258 { 259 struct snd_pcm_substream *substream = pcm->streams[stream].substream; 260 struct snd_dma_buffer *buf = &substream->dma_buffer; 261 size_t size = IMX_SSI_DMABUF_SIZE; 262 263 buf->dev.type = SNDRV_DMA_TYPE_DEV; 264 buf->dev.dev = pcm->card->dev; 265 buf->private_data = NULL; 266 buf->area = dma_alloc_writecombine(pcm->card->dev, size, 267 &buf->addr, GFP_KERNEL); 268 if (!buf->area) 269 return -ENOMEM; 270 buf->bytes = size; 271 272 return 0; 273 } 274 275 static u64 imx_pcm_dmamask = DMA_BIT_MASK(32); 276 277 static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd) 278 { 279 struct snd_card *card = rtd->card->snd_card; 280 struct snd_pcm *pcm = rtd->pcm; 281 int ret = 0; 282 283 if (!card->dev->dma_mask) 284 card->dev->dma_mask = &imx_pcm_dmamask; 285 if (!card->dev->coherent_dma_mask) 286 card->dev->coherent_dma_mask = DMA_BIT_MASK(32); 287 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 288 ret = imx_pcm_preallocate_dma_buffer(pcm, 289 SNDRV_PCM_STREAM_PLAYBACK); 290 if (ret) 291 goto out; 292 } 293 294 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 295 ret = imx_pcm_preallocate_dma_buffer(pcm, 296 SNDRV_PCM_STREAM_CAPTURE); 297 if (ret) 298 goto out; 299 } 300 301 out: 302 return ret; 303 } 304 305 static int ssi_irq = 0; 306 307 static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd) 308 { 309 struct snd_pcm *pcm = rtd->pcm; 310 struct snd_pcm_substream *substream; 311 int ret; 312 313 ret = imx_pcm_new(rtd); 314 if (ret) 315 return ret; 316 317 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; 318 if (substream) { 319 struct snd_dma_buffer *buf = &substream->dma_buffer; 320 321 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; 322 } 323 324 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; 325 if (substream) { 326 struct snd_dma_buffer *buf = &substream->dma_buffer; 327 328 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; 329 } 330 331 set_fiq_handler(&imx_ssi_fiq_start, 332 &imx_ssi_fiq_end - &imx_ssi_fiq_start); 333 334 return 0; 335 } 336 337 static void imx_pcm_free(struct snd_pcm *pcm) 338 { 339 struct snd_pcm_substream *substream; 340 struct snd_dma_buffer *buf; 341 int stream; 342 343 for (stream = 0; stream < 2; stream++) { 344 substream = pcm->streams[stream].substream; 345 if (!substream) 346 continue; 347 348 buf = &substream->dma_buffer; 349 if (!buf->area) 350 continue; 351 352 dma_free_writecombine(pcm->card->dev, buf->bytes, 353 buf->area, buf->addr); 354 buf->area = NULL; 355 } 356 } 357 358 static void imx_pcm_fiq_free(struct snd_pcm *pcm) 359 { 360 mxc_set_irq_fiq(ssi_irq, 0); 361 release_fiq(&fh); 362 imx_pcm_free(pcm); 363 } 364 365 static struct snd_soc_platform_driver imx_soc_platform_fiq = { 366 .ops = &imx_pcm_ops, 367 .pcm_new = imx_pcm_fiq_new, 368 .pcm_free = imx_pcm_fiq_free, 369 }; 370 371 int imx_pcm_fiq_init(struct platform_device *pdev, 372 struct imx_pcm_fiq_params *params) 373 { 374 int ret; 375 376 ret = claim_fiq(&fh); 377 if (ret) { 378 dev_err(&pdev->dev, "failed to claim fiq: %d", ret); 379 return ret; 380 } 381 382 mxc_set_irq_fiq(params->irq, 1); 383 ssi_irq = params->irq; 384 385 imx_pcm_fiq = params->irq; 386 387 imx_ssi_fiq_base = (unsigned long)params->base; 388 389 params->dma_params_tx->maxburst = 4; 390 params->dma_params_rx->maxburst = 6; 391 392 ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq); 393 if (ret) 394 goto failed_register; 395 396 return 0; 397 398 failed_register: 399 mxc_set_irq_fiq(ssi_irq, 0); 400 release_fiq(&fh); 401 402 return ret; 403 } 404 EXPORT_SYMBOL_GPL(imx_pcm_fiq_init); 405 406 void imx_pcm_fiq_exit(struct platform_device *pdev) 407 { 408 snd_soc_unregister_platform(&pdev->dev); 409 } 410 EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit); 411 412 MODULE_LICENSE("GPL"); 413