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1// SPDX-License-Identifier: GPL-2.0+2// imx-pcm-fiq.c -- ALSA Soc Audio Layer3//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 33struct 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 44static 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 else59 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 68static struct fiq_handler fh = {69 .name = DRV_NAME,70};71 72static 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 88static 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 else99 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;100 101 set_fiq_regs(®s);102 103 return 0;104}105 106static int imx_pcm_fiq;107 108static 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 else121 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 else133 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 146static snd_pcm_uframes_t147snd_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 156static 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 172static 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 202static 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 215static 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 230static int ssi_irq;231 232static 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 263static 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 270static 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 281int 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 309failed_register:310 mxc_set_irq_fiq(ssi_irq, 0);311 release_fiq(&fh);312 313 return ret;314}315EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);316 317void imx_pcm_fiq_exit(struct platform_device *pdev)318{319}320EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);321 322MODULE_DESCRIPTION("Freescale i.MX PCM FIQ handler");323MODULE_LICENSE("GPL");324