1 /* 2 * atmel-pcm.c -- ALSA PCM interface for the Atmel atmel SoC. 3 * 4 * Copyright (C) 2005 SAN People 5 * Copyright (C) 2008 Atmel 6 * 7 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com> 8 * 9 * Based on at91-pcm. by: 10 * Frank Mandarino <fmandarino@endrelia.com> 11 * Copyright 2006 Endrelia Technologies Inc. 12 * 13 * Based on pxa2xx-pcm.c by: 14 * 15 * Author: Nicolas Pitre 16 * Created: Nov 30, 2004 17 * Copyright: (C) 2004 MontaVista Software, Inc. 18 * 19 * This program is free software; you can redistribute it and/or modify 20 * it under the terms of the GNU General Public License as published by 21 * the Free Software Foundation; either version 2 of the License, or 22 * (at your option) any later version. 23 * 24 * This program is distributed in the hope that it will be useful, 25 * but WITHOUT ANY WARRANTY; without even the implied warranty of 26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 27 * GNU General Public License for more details. 28 * 29 * You should have received a copy of the GNU General Public License 30 * along with this program; if not, write to the Free Software 31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 32 */ 33 34 #include <linux/module.h> 35 #include <linux/init.h> 36 #include <linux/platform_device.h> 37 #include <linux/slab.h> 38 #include <linux/dma-mapping.h> 39 #include <linux/atmel_pdc.h> 40 #include <linux/atmel-ssc.h> 41 42 #include <sound/core.h> 43 #include <sound/pcm.h> 44 #include <sound/pcm_params.h> 45 #include <sound/soc.h> 46 47 #include "atmel-pcm.h" 48 49 50 /*--------------------------------------------------------------------------*\ 51 * Hardware definition 52 \*--------------------------------------------------------------------------*/ 53 /* TODO: These values were taken from the AT91 platform driver, check 54 * them against real values for AT32 55 */ 56 static const struct snd_pcm_hardware atmel_pcm_hardware = { 57 .info = SNDRV_PCM_INFO_MMAP | 58 SNDRV_PCM_INFO_MMAP_VALID | 59 SNDRV_PCM_INFO_INTERLEAVED | 60 SNDRV_PCM_INFO_PAUSE, 61 .period_bytes_min = 32, 62 .period_bytes_max = 8192, 63 .periods_min = 2, 64 .periods_max = 1024, 65 .buffer_bytes_max = ATMEL_SSC_DMABUF_SIZE, 66 }; 67 68 69 /*--------------------------------------------------------------------------*\ 70 * Data types 71 \*--------------------------------------------------------------------------*/ 72 struct atmel_runtime_data { 73 struct atmel_pcm_dma_params *params; 74 dma_addr_t dma_buffer; /* physical address of dma buffer */ 75 dma_addr_t dma_buffer_end; /* first address beyond DMA buffer */ 76 size_t period_size; 77 78 dma_addr_t period_ptr; /* physical address of next period */ 79 80 /* PDC register save */ 81 u32 pdc_xpr_save; 82 u32 pdc_xcr_save; 83 u32 pdc_xnpr_save; 84 u32 pdc_xncr_save; 85 }; 86 87 /*--------------------------------------------------------------------------*\ 88 * ISR 89 \*--------------------------------------------------------------------------*/ 90 static void atmel_pcm_dma_irq(u32 ssc_sr, 91 struct snd_pcm_substream *substream) 92 { 93 struct atmel_runtime_data *prtd = substream->runtime->private_data; 94 struct atmel_pcm_dma_params *params = prtd->params; 95 static int count; 96 97 count++; 98 99 if (ssc_sr & params->mask->ssc_endbuf) { 100 pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x, count=%d)\n", 101 substream->stream == SNDRV_PCM_STREAM_PLAYBACK 102 ? "underrun" : "overrun", 103 params->name, ssc_sr, count); 104 105 /* re-start the PDC */ 106 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, 107 params->mask->pdc_disable); 108 prtd->period_ptr += prtd->period_size; 109 if (prtd->period_ptr >= prtd->dma_buffer_end) 110 prtd->period_ptr = prtd->dma_buffer; 111 112 ssc_writex(params->ssc->regs, params->pdc->xpr, 113 prtd->period_ptr); 114 ssc_writex(params->ssc->regs, params->pdc->xcr, 115 prtd->period_size / params->pdc_xfer_size); 116 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, 117 params->mask->pdc_enable); 118 } 119 120 if (ssc_sr & params->mask->ssc_endx) { 121 /* Load the PDC next pointer and counter registers */ 122 prtd->period_ptr += prtd->period_size; 123 if (prtd->period_ptr >= prtd->dma_buffer_end) 124 prtd->period_ptr = prtd->dma_buffer; 125 126 ssc_writex(params->ssc->regs, params->pdc->xnpr, 127 prtd->period_ptr); 128 ssc_writex(params->ssc->regs, params->pdc->xncr, 129 prtd->period_size / params->pdc_xfer_size); 130 } 131 132 snd_pcm_period_elapsed(substream); 133 } 134 135 136 /*--------------------------------------------------------------------------*\ 137 * PCM operations 138 \*--------------------------------------------------------------------------*/ 139 static int atmel_pcm_hw_params(struct snd_pcm_substream *substream, 140 struct snd_pcm_hw_params *params) 141 { 142 struct snd_pcm_runtime *runtime = substream->runtime; 143 struct atmel_runtime_data *prtd = runtime->private_data; 144 struct snd_soc_pcm_runtime *rtd = substream->private_data; 145 146 /* this may get called several times by oss emulation 147 * with different params */ 148 149 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 150 runtime->dma_bytes = params_buffer_bytes(params); 151 152 prtd->params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); 153 prtd->params->dma_intr_handler = atmel_pcm_dma_irq; 154 155 prtd->dma_buffer = runtime->dma_addr; 156 prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes; 157 prtd->period_size = params_period_bytes(params); 158 159 pr_debug("atmel-pcm: " 160 "hw_params: DMA for %s initialized " 161 "(dma_bytes=%zu, period_size=%zu)\n", 162 prtd->params->name, 163 runtime->dma_bytes, 164 prtd->period_size); 165 return 0; 166 } 167 168 static int atmel_pcm_hw_free(struct snd_pcm_substream *substream) 169 { 170 struct atmel_runtime_data *prtd = substream->runtime->private_data; 171 struct atmel_pcm_dma_params *params = prtd->params; 172 173 if (params != NULL) { 174 ssc_writex(params->ssc->regs, SSC_PDC_PTCR, 175 params->mask->pdc_disable); 176 prtd->params->dma_intr_handler = NULL; 177 } 178 179 return 0; 180 } 181 182 static int atmel_pcm_prepare(struct snd_pcm_substream *substream) 183 { 184 struct atmel_runtime_data *prtd = substream->runtime->private_data; 185 struct atmel_pcm_dma_params *params = prtd->params; 186 187 ssc_writex(params->ssc->regs, SSC_IDR, 188 params->mask->ssc_endx | params->mask->ssc_endbuf); 189 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, 190 params->mask->pdc_disable); 191 return 0; 192 } 193 194 static int atmel_pcm_trigger(struct snd_pcm_substream *substream, 195 int cmd) 196 { 197 struct snd_pcm_runtime *rtd = substream->runtime; 198 struct atmel_runtime_data *prtd = rtd->private_data; 199 struct atmel_pcm_dma_params *params = prtd->params; 200 int ret = 0; 201 202 pr_debug("atmel-pcm:buffer_size = %ld," 203 "dma_area = %p, dma_bytes = %zu\n", 204 rtd->buffer_size, rtd->dma_area, rtd->dma_bytes); 205 206 switch (cmd) { 207 case SNDRV_PCM_TRIGGER_START: 208 prtd->period_ptr = prtd->dma_buffer; 209 210 ssc_writex(params->ssc->regs, params->pdc->xpr, 211 prtd->period_ptr); 212 ssc_writex(params->ssc->regs, params->pdc->xcr, 213 prtd->period_size / params->pdc_xfer_size); 214 215 prtd->period_ptr += prtd->period_size; 216 ssc_writex(params->ssc->regs, params->pdc->xnpr, 217 prtd->period_ptr); 218 ssc_writex(params->ssc->regs, params->pdc->xncr, 219 prtd->period_size / params->pdc_xfer_size); 220 221 pr_debug("atmel-pcm: trigger: " 222 "period_ptr=%lx, xpr=%u, " 223 "xcr=%u, xnpr=%u, xncr=%u\n", 224 (unsigned long)prtd->period_ptr, 225 ssc_readx(params->ssc->regs, params->pdc->xpr), 226 ssc_readx(params->ssc->regs, params->pdc->xcr), 227 ssc_readx(params->ssc->regs, params->pdc->xnpr), 228 ssc_readx(params->ssc->regs, params->pdc->xncr)); 229 230 ssc_writex(params->ssc->regs, SSC_IER, 231 params->mask->ssc_endx | params->mask->ssc_endbuf); 232 ssc_writex(params->ssc->regs, SSC_PDC_PTCR, 233 params->mask->pdc_enable); 234 235 pr_debug("sr=%u imr=%u\n", 236 ssc_readx(params->ssc->regs, SSC_SR), 237 ssc_readx(params->ssc->regs, SSC_IER)); 238 break; /* SNDRV_PCM_TRIGGER_START */ 239 240 case SNDRV_PCM_TRIGGER_STOP: 241 case SNDRV_PCM_TRIGGER_SUSPEND: 242 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 243 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, 244 params->mask->pdc_disable); 245 break; 246 247 case SNDRV_PCM_TRIGGER_RESUME: 248 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 249 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, 250 params->mask->pdc_enable); 251 break; 252 253 default: 254 ret = -EINVAL; 255 } 256 257 return ret; 258 } 259 260 static snd_pcm_uframes_t atmel_pcm_pointer( 261 struct snd_pcm_substream *substream) 262 { 263 struct snd_pcm_runtime *runtime = substream->runtime; 264 struct atmel_runtime_data *prtd = runtime->private_data; 265 struct atmel_pcm_dma_params *params = prtd->params; 266 dma_addr_t ptr; 267 snd_pcm_uframes_t x; 268 269 ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr); 270 x = bytes_to_frames(runtime, ptr - prtd->dma_buffer); 271 272 if (x == runtime->buffer_size) 273 x = 0; 274 275 return x; 276 } 277 278 static int atmel_pcm_open(struct snd_pcm_substream *substream) 279 { 280 struct snd_pcm_runtime *runtime = substream->runtime; 281 struct atmel_runtime_data *prtd; 282 int ret = 0; 283 284 snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware); 285 286 /* ensure that buffer size is a multiple of period size */ 287 ret = snd_pcm_hw_constraint_integer(runtime, 288 SNDRV_PCM_HW_PARAM_PERIODS); 289 if (ret < 0) 290 goto out; 291 292 prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL); 293 if (prtd == NULL) { 294 ret = -ENOMEM; 295 goto out; 296 } 297 runtime->private_data = prtd; 298 299 out: 300 return ret; 301 } 302 303 static int atmel_pcm_close(struct snd_pcm_substream *substream) 304 { 305 struct atmel_runtime_data *prtd = substream->runtime->private_data; 306 307 kfree(prtd); 308 return 0; 309 } 310 311 static struct snd_pcm_ops atmel_pcm_ops = { 312 .open = atmel_pcm_open, 313 .close = atmel_pcm_close, 314 .ioctl = snd_pcm_lib_ioctl, 315 .hw_params = atmel_pcm_hw_params, 316 .hw_free = atmel_pcm_hw_free, 317 .prepare = atmel_pcm_prepare, 318 .trigger = atmel_pcm_trigger, 319 .pointer = atmel_pcm_pointer, 320 .mmap = atmel_pcm_mmap, 321 }; 322 323 324 /*--------------------------------------------------------------------------*\ 325 * ASoC platform driver 326 \*--------------------------------------------------------------------------*/ 327 #ifdef CONFIG_PM 328 static int atmel_pcm_suspend(struct snd_soc_dai *dai) 329 { 330 struct snd_pcm_runtime *runtime = dai->runtime; 331 struct atmel_runtime_data *prtd; 332 struct atmel_pcm_dma_params *params; 333 334 if (!runtime) 335 return 0; 336 337 prtd = runtime->private_data; 338 params = prtd->params; 339 340 /* disable the PDC and save the PDC registers */ 341 342 ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_disable); 343 344 prtd->pdc_xpr_save = ssc_readx(params->ssc->regs, params->pdc->xpr); 345 prtd->pdc_xcr_save = ssc_readx(params->ssc->regs, params->pdc->xcr); 346 prtd->pdc_xnpr_save = ssc_readx(params->ssc->regs, params->pdc->xnpr); 347 prtd->pdc_xncr_save = ssc_readx(params->ssc->regs, params->pdc->xncr); 348 349 return 0; 350 } 351 352 static int atmel_pcm_resume(struct snd_soc_dai *dai) 353 { 354 struct snd_pcm_runtime *runtime = dai->runtime; 355 struct atmel_runtime_data *prtd; 356 struct atmel_pcm_dma_params *params; 357 358 if (!runtime) 359 return 0; 360 361 prtd = runtime->private_data; 362 params = prtd->params; 363 364 /* restore the PDC registers and enable the PDC */ 365 ssc_writex(params->ssc->regs, params->pdc->xpr, prtd->pdc_xpr_save); 366 ssc_writex(params->ssc->regs, params->pdc->xcr, prtd->pdc_xcr_save); 367 ssc_writex(params->ssc->regs, params->pdc->xnpr, prtd->pdc_xnpr_save); 368 ssc_writex(params->ssc->regs, params->pdc->xncr, prtd->pdc_xncr_save); 369 370 ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_enable); 371 return 0; 372 } 373 #else 374 #define atmel_pcm_suspend NULL 375 #define atmel_pcm_resume NULL 376 #endif 377 378 static struct snd_soc_platform_driver atmel_soc_platform = { 379 .ops = &atmel_pcm_ops, 380 .pcm_new = atmel_pcm_new, 381 .pcm_free = atmel_pcm_free, 382 .suspend = atmel_pcm_suspend, 383 .resume = atmel_pcm_resume, 384 }; 385 386 int atmel_pcm_pdc_platform_register(struct device *dev) 387 { 388 return snd_soc_register_platform(dev, &atmel_soc_platform); 389 } 390 EXPORT_SYMBOL(atmel_pcm_pdc_platform_register); 391 392 void atmel_pcm_pdc_platform_unregister(struct device *dev) 393 { 394 snd_soc_unregister_platform(dev); 395 } 396 EXPORT_SYMBOL(atmel_pcm_pdc_platform_unregister); 397 398 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>"); 399 MODULE_DESCRIPTION("Atmel PCM module"); 400 MODULE_LICENSE("GPL"); 401