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 85 return 0; 86 } 87 88 static int snd_imx_pcm_prepare(struct snd_soc_component *component, 89 struct snd_pcm_substream *substream) 90 { 91 struct snd_pcm_runtime *runtime = substream->runtime; 92 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 93 struct pt_regs regs; 94 95 get_fiq_regs(®s); 96 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 97 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16; 98 else 99 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16; 100 101 set_fiq_regs(®s); 102 103 return 0; 104 } 105 106 static int imx_pcm_fiq; 107 108 static int snd_imx_pcm_trigger(struct snd_soc_component *component, 109 struct snd_pcm_substream *substream, int cmd) 110 { 111 struct snd_pcm_runtime *runtime = substream->runtime; 112 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 113 114 switch (cmd) { 115 case SNDRV_PCM_TRIGGER_START: 116 case SNDRV_PCM_TRIGGER_RESUME: 117 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 118 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 119 atomic_set(&iprtd->playing, 1); 120 else 121 atomic_set(&iprtd->capturing, 1); 122 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns), 123 HRTIMER_MODE_REL); 124 enable_fiq(imx_pcm_fiq); 125 break; 126 127 case SNDRV_PCM_TRIGGER_STOP: 128 case SNDRV_PCM_TRIGGER_SUSPEND: 129 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 130 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 131 atomic_set(&iprtd->playing, 0); 132 else 133 atomic_set(&iprtd->capturing, 0); 134 if (!atomic_read(&iprtd->playing) && 135 !atomic_read(&iprtd->capturing)) 136 disable_fiq(imx_pcm_fiq); 137 break; 138 139 default: 140 return -EINVAL; 141 } 142 143 return 0; 144 } 145 146 static snd_pcm_uframes_t 147 snd_imx_pcm_pointer(struct snd_soc_component *component, 148 struct snd_pcm_substream *substream) 149 { 150 struct snd_pcm_runtime *runtime = substream->runtime; 151 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 152 153 return bytes_to_frames(substream->runtime, iprtd->offset); 154 } 155 156 static const struct snd_pcm_hardware snd_imx_hardware = { 157 .info = SNDRV_PCM_INFO_INTERLEAVED | 158 SNDRV_PCM_INFO_BLOCK_TRANSFER | 159 SNDRV_PCM_INFO_MMAP | 160 SNDRV_PCM_INFO_MMAP_VALID | 161 SNDRV_PCM_INFO_PAUSE | 162 SNDRV_PCM_INFO_RESUME, 163 .formats = SNDRV_PCM_FMTBIT_S16_LE, 164 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, 165 .period_bytes_min = 128, 166 .period_bytes_max = 16 * 1024, 167 .periods_min = 4, 168 .periods_max = 255, 169 .fifo_size = 0, 170 }; 171 172 static int snd_imx_open(struct snd_soc_component *component, 173 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_soc_component *component, 203 struct snd_pcm_substream *substream) 204 { 205 struct snd_pcm_runtime *runtime = substream->runtime; 206 struct imx_pcm_runtime_data *iprtd = runtime->private_data; 207 208 hrtimer_cancel(&iprtd->hrt); 209 210 kfree(iprtd); 211 212 return 0; 213 } 214 215 static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd) 216 { 217 struct snd_card *card = rtd->card->snd_card; 218 struct snd_pcm *pcm = rtd->pcm; 219 int ret; 220 221 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 222 if (ret) 223 return ret; 224 225 return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC, 226 pcm->card->dev, 227 IMX_SSI_DMABUF_SIZE); 228 } 229 230 static int ssi_irq; 231 232 static int snd_imx_pcm_new(struct snd_soc_component *component, 233 struct snd_soc_pcm_runtime *rtd) 234 { 235 struct snd_pcm *pcm = rtd->pcm; 236 struct snd_pcm_substream *substream; 237 int ret; 238 239 ret = imx_pcm_new(rtd); 240 if (ret) 241 return ret; 242 243 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; 244 if (substream) { 245 struct snd_dma_buffer *buf = &substream->dma_buffer; 246 247 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; 248 } 249 250 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; 251 if (substream) { 252 struct snd_dma_buffer *buf = &substream->dma_buffer; 253 254 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; 255 } 256 257 set_fiq_handler(&imx_ssi_fiq_start, 258 &imx_ssi_fiq_end - &imx_ssi_fiq_start); 259 260 return 0; 261 } 262 263 static void snd_imx_pcm_free(struct snd_soc_component *component, 264 struct snd_pcm *pcm) 265 { 266 mxc_set_irq_fiq(ssi_irq, 0); 267 release_fiq(&fh); 268 } 269 270 static const struct snd_soc_component_driver imx_soc_component_fiq = { 271 .open = snd_imx_open, 272 .close = snd_imx_close, 273 .hw_params = snd_imx_pcm_hw_params, 274 .prepare = snd_imx_pcm_prepare, 275 .trigger = snd_imx_pcm_trigger, 276 .pointer = snd_imx_pcm_pointer, 277 .pcm_construct = snd_imx_pcm_new, 278 .pcm_destruct = snd_imx_pcm_free, 279 }; 280 281 int imx_pcm_fiq_init(struct platform_device *pdev, 282 struct imx_pcm_fiq_params *params) 283 { 284 int ret; 285 286 ret = claim_fiq(&fh); 287 if (ret) { 288 dev_err(&pdev->dev, "failed to claim fiq: %d", ret); 289 return ret; 290 } 291 292 mxc_set_irq_fiq(params->irq, 1); 293 ssi_irq = params->irq; 294 295 imx_pcm_fiq = params->irq; 296 297 imx_ssi_fiq_base = (unsigned long)params->base; 298 299 params->dma_params_tx->maxburst = 4; 300 params->dma_params_rx->maxburst = 6; 301 302 ret = devm_snd_soc_register_component(&pdev->dev, &imx_soc_component_fiq, 303 NULL, 0); 304 if (ret) 305 goto failed_register; 306 307 return 0; 308 309 failed_register: 310 mxc_set_irq_fiq(ssi_irq, 0); 311 release_fiq(&fh); 312 313 return ret; 314 } 315 EXPORT_SYMBOL_GPL(imx_pcm_fiq_init); 316 317 void imx_pcm_fiq_exit(struct platform_device *pdev) 318 { 319 } 320 EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit); 321 322 MODULE_LICENSE("GPL"); 323