1 // SPDX-License-Identifier: GPL-2.0+ 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 #include <linux/clk.h> 10 #include <linux/delay.h> 11 #include <linux/device.h> 12 #include <linux/dma-mapping.h> 13 #include <linux/init.h> 14 #include <linux/interrupt.h> 15 #include <linux/module.h> 16 #include <linux/platform_device.h> 17 #include <linux/slab.h> 18 19 #include <sound/core.h> 20 #include <sound/dmaengine_pcm.h> 21 #include <sound/initval.h> 22 #include <sound/pcm.h> 23 #include <sound/pcm_params.h> 24 #include <sound/soc.h> 25 26 #include <asm/fiq.h> 27 28 #include <linux/platform_data/asoc-imx-ssi.h> 29 30 #include "imx-ssi.h" 31 #include "imx-pcm.h" 32 33 struct imx_pcm_runtime_data { 34 unsigned int period; 35 int periods; 36 unsigned long offset; 37 struct hrtimer hrt; 38 int poll_time_ns; 39 struct snd_pcm_substream *substream; 40 atomic_t playing; 41 atomic_t capturing; 42 }; 43 44 static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt) 45 { 46 struct imx_pcm_runtime_data *iprtd = 47 container_of(hrt, struct imx_pcm_runtime_data, hrt); 48 struct snd_pcm_substream *substream = iprtd->substream; 49 struct pt_regs regs; 50 51 if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing)) 52 return HRTIMER_NORESTART; 53 54 get_fiq_regs(®s); 55 56 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 57 iprtd->offset = regs.ARM_r8 & 0xffff; 58 else 59 iprtd->offset = regs.ARM_r9 & 0xffff; 60 61 snd_pcm_period_elapsed(substream); 62 63 hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns)); 64 65 return HRTIMER_RESTART; 66 } 67 68 static struct fiq_handler fh = { 69 .name = DRV_NAME, 70 }; 71 72 static int snd_imx_pcm_hw_params(struct snd_soc_component *component, 73 struct snd_pcm_substream *substream, 74 struct snd_pcm_hw_params *params) 75 { 76 struct snd_pcm_runtime *runtime = substream->runtime; 77 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 78 79 iprtd->periods = params_periods(params); 80 iprtd->period = params_period_bytes(params); 81 iprtd->offset = 0; 82 iprtd->poll_time_ns = 1000000000 / params_rate(params) * 83 params_period_size(params); 84 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 85 86 return 0; 87 } 88 89 static int snd_imx_pcm_prepare(struct snd_soc_component *component, 90 struct snd_pcm_substream *substream) 91 { 92 struct snd_pcm_runtime *runtime = substream->runtime; 93 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 94 struct pt_regs regs; 95 96 get_fiq_regs(®s); 97 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 98 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16; 99 else 100 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16; 101 102 set_fiq_regs(®s); 103 104 return 0; 105 } 106 107 static int imx_pcm_fiq; 108 109 static int snd_imx_pcm_trigger(struct snd_soc_component *component, 110 struct snd_pcm_substream *substream, int cmd) 111 { 112 struct snd_pcm_runtime *runtime = substream->runtime; 113 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 114 115 switch (cmd) { 116 case SNDRV_PCM_TRIGGER_START: 117 case SNDRV_PCM_TRIGGER_RESUME: 118 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 119 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 120 atomic_set(&iprtd->playing, 1); 121 else 122 atomic_set(&iprtd->capturing, 1); 123 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns), 124 HRTIMER_MODE_REL); 125 enable_fiq(imx_pcm_fiq); 126 break; 127 128 case SNDRV_PCM_TRIGGER_STOP: 129 case SNDRV_PCM_TRIGGER_SUSPEND: 130 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 131 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 132 atomic_set(&iprtd->playing, 0); 133 else 134 atomic_set(&iprtd->capturing, 0); 135 if (!atomic_read(&iprtd->playing) && 136 !atomic_read(&iprtd->capturing)) 137 disable_fiq(imx_pcm_fiq); 138 break; 139 140 default: 141 return -EINVAL; 142 } 143 144 return 0; 145 } 146 147 static snd_pcm_uframes_t 148 snd_imx_pcm_pointer(struct snd_soc_component *component, 149 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 const 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_soc_component *component, 174 struct snd_pcm_substream *substream) 175 { 176 struct snd_pcm_runtime *runtime = substream->runtime; 177 struct imx_pcm_runtime_data *iprtd; 178 int ret; 179 180 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); 181 if (iprtd == NULL) 182 return -ENOMEM; 183 runtime->private_data = iprtd; 184 185 iprtd->substream = substream; 186 187 atomic_set(&iprtd->playing, 0); 188 atomic_set(&iprtd->capturing, 0); 189 hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 190 iprtd->hrt.function = snd_hrtimer_callback; 191 192 ret = snd_pcm_hw_constraint_integer(substream->runtime, 193 SNDRV_PCM_HW_PARAM_PERIODS); 194 if (ret < 0) { 195 kfree(iprtd); 196 return ret; 197 } 198 199 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); 200 return 0; 201 } 202 203 static int snd_imx_close(struct snd_soc_component *component, 204 struct snd_pcm_substream *substream) 205 { 206 struct snd_pcm_runtime *runtime = substream->runtime; 207 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 208 209 hrtimer_cancel(&iprtd->hrt); 210 211 kfree(iprtd); 212 213 return 0; 214 } 215 216 static int snd_imx_pcm_mmap(struct snd_soc_component *component, 217 struct snd_pcm_substream *substream, 218 struct vm_area_struct *vma) 219 { 220 struct snd_pcm_runtime *runtime = substream->runtime; 221 int ret; 222 223 ret = dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area, 224 runtime->dma_addr, runtime->dma_bytes); 225 226 pr_debug("%s: ret: %d %p %pad 0x%08zx\n", __func__, ret, 227 runtime->dma_area, 228 &runtime->dma_addr, 229 runtime->dma_bytes); 230 return ret; 231 } 232 233 static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) 234 { 235 struct snd_pcm_substream *substream = pcm->streams[stream].substream; 236 struct snd_dma_buffer *buf = &substream->dma_buffer; 237 size_t size = IMX_SSI_DMABUF_SIZE; 238 239 buf->dev.type = SNDRV_DMA_TYPE_DEV; 240 buf->dev.dev = pcm->card->dev; 241 buf->private_data = NULL; 242 buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL); 243 if (!buf->area) 244 return -ENOMEM; 245 buf->bytes = size; 246 247 return 0; 248 } 249 250 static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd) 251 { 252 struct snd_card *card = rtd->card->snd_card; 253 struct snd_pcm *pcm = rtd->pcm; 254 int ret; 255 256 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 257 if (ret) 258 return ret; 259 260 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 261 ret = imx_pcm_preallocate_dma_buffer(pcm, 262 SNDRV_PCM_STREAM_PLAYBACK); 263 if (ret) 264 return ret; 265 } 266 267 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 268 ret = imx_pcm_preallocate_dma_buffer(pcm, 269 SNDRV_PCM_STREAM_CAPTURE); 270 if (ret) 271 return ret; 272 } 273 274 return 0; 275 } 276 277 static int ssi_irq; 278 279 static int snd_imx_pcm_new(struct snd_soc_component *component, 280 struct snd_soc_pcm_runtime *rtd) 281 { 282 struct snd_pcm *pcm = rtd->pcm; 283 struct snd_pcm_substream *substream; 284 int ret; 285 286 ret = imx_pcm_new(rtd); 287 if (ret) 288 return ret; 289 290 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; 291 if (substream) { 292 struct snd_dma_buffer *buf = &substream->dma_buffer; 293 294 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; 295 } 296 297 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; 298 if (substream) { 299 struct snd_dma_buffer *buf = &substream->dma_buffer; 300 301 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; 302 } 303 304 set_fiq_handler(&imx_ssi_fiq_start, 305 &imx_ssi_fiq_end - &imx_ssi_fiq_start); 306 307 return 0; 308 } 309 310 static void imx_pcm_free(struct snd_pcm *pcm) 311 { 312 struct snd_pcm_substream *substream; 313 struct snd_dma_buffer *buf; 314 int stream; 315 316 for (stream = 0; stream < 2; stream++) { 317 substream = pcm->streams[stream].substream; 318 if (!substream) 319 continue; 320 321 buf = &substream->dma_buffer; 322 if (!buf->area) 323 continue; 324 325 dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr); 326 buf->area = NULL; 327 } 328 } 329 330 static void snd_imx_pcm_free(struct snd_soc_component *component, 331 struct snd_pcm *pcm) 332 { 333 mxc_set_irq_fiq(ssi_irq, 0); 334 release_fiq(&fh); 335 imx_pcm_free(pcm); 336 } 337 338 static const struct snd_soc_component_driver imx_soc_component_fiq = { 339 .open = snd_imx_open, 340 .close = snd_imx_close, 341 .hw_params = snd_imx_pcm_hw_params, 342 .prepare = snd_imx_pcm_prepare, 343 .trigger = snd_imx_pcm_trigger, 344 .pointer = snd_imx_pcm_pointer, 345 .mmap = snd_imx_pcm_mmap, 346 .pcm_construct = snd_imx_pcm_new, 347 .pcm_destruct = snd_imx_pcm_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 = devm_snd_soc_register_component(&pdev->dev, &imx_soc_component_fiq, 372 NULL, 0); 373 if (ret) 374 goto failed_register; 375 376 return 0; 377 378 failed_register: 379 mxc_set_irq_fiq(ssi_irq, 0); 380 release_fiq(&fh); 381 382 return ret; 383 } 384 EXPORT_SYMBOL_GPL(imx_pcm_fiq_init); 385 386 void imx_pcm_fiq_exit(struct platform_device *pdev) 387 { 388 } 389 EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit); 390 391 MODULE_LICENSE("GPL"); 392