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391 lines
9.3 KiB
391 lines
9.3 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// imx-pcm-fiq.c -- ALSA Soc Audio Layer |
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// |
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// Copyright 2009 Sascha Hauer <[email protected]> |
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// |
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// This code is based on code copyrighted by Freescale, |
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// Liam Girdwood, Javier Martin and probably others. |
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#include <linux/clk.h> |
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#include <linux/delay.h> |
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#include <linux/device.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <sound/core.h> |
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#include <sound/dmaengine_pcm.h> |
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#include <sound/initval.h> |
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#include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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#include <sound/soc.h> |
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#include <asm/fiq.h> |
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#include <linux/platform_data/asoc-imx-ssi.h> |
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#include "imx-ssi.h" |
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#include "imx-pcm.h" |
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struct imx_pcm_runtime_data { |
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unsigned int period; |
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int periods; |
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unsigned long offset; |
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struct hrtimer hrt; |
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int poll_time_ns; |
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struct snd_pcm_substream *substream; |
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atomic_t playing; |
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atomic_t capturing; |
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}; |
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static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt) |
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{ |
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struct imx_pcm_runtime_data *iprtd = |
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container_of(hrt, struct imx_pcm_runtime_data, hrt); |
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struct snd_pcm_substream *substream = iprtd->substream; |
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struct pt_regs regs; |
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if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing)) |
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return HRTIMER_NORESTART; |
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get_fiq_regs(®s); |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
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iprtd->offset = regs.ARM_r8 & 0xffff; |
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else |
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iprtd->offset = regs.ARM_r9 & 0xffff; |
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snd_pcm_period_elapsed(substream); |
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hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns)); |
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return HRTIMER_RESTART; |
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} |
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static struct fiq_handler fh = { |
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.name = DRV_NAME, |
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}; |
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static int snd_imx_pcm_hw_params(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params) |
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{ |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
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iprtd->periods = params_periods(params); |
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iprtd->period = params_period_bytes(params); |
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iprtd->offset = 0; |
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iprtd->poll_time_ns = 1000000000 / params_rate(params) * |
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params_period_size(params); |
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
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return 0; |
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} |
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static int snd_imx_pcm_prepare(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
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struct pt_regs regs; |
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get_fiq_regs(®s); |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
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regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16; |
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else |
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regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16; |
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set_fiq_regs(®s); |
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return 0; |
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} |
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static int imx_pcm_fiq; |
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static int snd_imx_pcm_trigger(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream, int cmd) |
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{ |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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case SNDRV_PCM_TRIGGER_RESUME: |
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
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atomic_set(&iprtd->playing, 1); |
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else |
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atomic_set(&iprtd->capturing, 1); |
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hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns), |
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HRTIMER_MODE_REL); |
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enable_fiq(imx_pcm_fiq); |
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break; |
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case SNDRV_PCM_TRIGGER_STOP: |
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case SNDRV_PCM_TRIGGER_SUSPEND: |
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
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atomic_set(&iprtd->playing, 0); |
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else |
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atomic_set(&iprtd->capturing, 0); |
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if (!atomic_read(&iprtd->playing) && |
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!atomic_read(&iprtd->capturing)) |
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disable_fiq(imx_pcm_fiq); |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static snd_pcm_uframes_t |
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snd_imx_pcm_pointer(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
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return bytes_to_frames(substream->runtime, iprtd->offset); |
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} |
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static const struct snd_pcm_hardware snd_imx_hardware = { |
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.info = SNDRV_PCM_INFO_INTERLEAVED | |
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SNDRV_PCM_INFO_BLOCK_TRANSFER | |
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SNDRV_PCM_INFO_MMAP | |
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SNDRV_PCM_INFO_MMAP_VALID | |
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SNDRV_PCM_INFO_PAUSE | |
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SNDRV_PCM_INFO_RESUME, |
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.formats = SNDRV_PCM_FMTBIT_S16_LE, |
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.buffer_bytes_max = IMX_SSI_DMABUF_SIZE, |
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.period_bytes_min = 128, |
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.period_bytes_max = 16 * 1024, |
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.periods_min = 4, |
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.periods_max = 255, |
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.fifo_size = 0, |
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}; |
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static int snd_imx_open(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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struct imx_pcm_runtime_data *iprtd; |
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int ret; |
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iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); |
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if (iprtd == NULL) |
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return -ENOMEM; |
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runtime->private_data = iprtd; |
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iprtd->substream = substream; |
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atomic_set(&iprtd->playing, 0); |
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atomic_set(&iprtd->capturing, 0); |
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hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
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iprtd->hrt.function = snd_hrtimer_callback; |
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ret = snd_pcm_hw_constraint_integer(substream->runtime, |
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SNDRV_PCM_HW_PARAM_PERIODS); |
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if (ret < 0) { |
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kfree(iprtd); |
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return ret; |
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} |
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snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); |
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return 0; |
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} |
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static int snd_imx_close(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
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hrtimer_cancel(&iprtd->hrt); |
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kfree(iprtd); |
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return 0; |
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} |
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static int snd_imx_pcm_mmap(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream, |
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struct vm_area_struct *vma) |
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{ |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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int ret; |
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ret = dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area, |
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runtime->dma_addr, runtime->dma_bytes); |
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pr_debug("%s: ret: %d %p %pad 0x%08zx\n", __func__, ret, |
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runtime->dma_area, |
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&runtime->dma_addr, |
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runtime->dma_bytes); |
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return ret; |
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} |
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static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) |
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{ |
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struct snd_pcm_substream *substream = pcm->streams[stream].substream; |
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struct snd_dma_buffer *buf = &substream->dma_buffer; |
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size_t size = IMX_SSI_DMABUF_SIZE; |
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buf->dev.type = SNDRV_DMA_TYPE_DEV; |
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buf->dev.dev = pcm->card->dev; |
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buf->private_data = NULL; |
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buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL); |
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if (!buf->area) |
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return -ENOMEM; |
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buf->bytes = size; |
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return 0; |
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} |
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static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd) |
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{ |
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struct snd_card *card = rtd->card->snd_card; |
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struct snd_pcm *pcm = rtd->pcm; |
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int ret; |
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ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); |
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if (ret) |
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return ret; |
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if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { |
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ret = imx_pcm_preallocate_dma_buffer(pcm, |
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SNDRV_PCM_STREAM_PLAYBACK); |
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if (ret) |
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return ret; |
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} |
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if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { |
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ret = imx_pcm_preallocate_dma_buffer(pcm, |
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SNDRV_PCM_STREAM_CAPTURE); |
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if (ret) |
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return ret; |
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} |
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return 0; |
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} |
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static int ssi_irq; |
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static int snd_imx_pcm_new(struct snd_soc_component *component, |
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struct snd_soc_pcm_runtime *rtd) |
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{ |
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struct snd_pcm *pcm = rtd->pcm; |
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struct snd_pcm_substream *substream; |
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int ret; |
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ret = imx_pcm_new(rtd); |
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if (ret) |
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return ret; |
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substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; |
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if (substream) { |
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struct snd_dma_buffer *buf = &substream->dma_buffer; |
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imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; |
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} |
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substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; |
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if (substream) { |
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struct snd_dma_buffer *buf = &substream->dma_buffer; |
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imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; |
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} |
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set_fiq_handler(&imx_ssi_fiq_start, |
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&imx_ssi_fiq_end - &imx_ssi_fiq_start); |
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return 0; |
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} |
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static void imx_pcm_free(struct snd_pcm *pcm) |
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{ |
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struct snd_pcm_substream *substream; |
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struct snd_dma_buffer *buf; |
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int stream; |
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for (stream = 0; stream < 2; stream++) { |
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substream = pcm->streams[stream].substream; |
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if (!substream) |
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continue; |
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buf = &substream->dma_buffer; |
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if (!buf->area) |
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continue; |
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dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr); |
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buf->area = NULL; |
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} |
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} |
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static void snd_imx_pcm_free(struct snd_soc_component *component, |
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struct snd_pcm *pcm) |
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{ |
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mxc_set_irq_fiq(ssi_irq, 0); |
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release_fiq(&fh); |
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imx_pcm_free(pcm); |
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} |
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static const struct snd_soc_component_driver imx_soc_component_fiq = { |
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.open = snd_imx_open, |
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.close = snd_imx_close, |
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.hw_params = snd_imx_pcm_hw_params, |
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.prepare = snd_imx_pcm_prepare, |
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.trigger = snd_imx_pcm_trigger, |
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.pointer = snd_imx_pcm_pointer, |
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.mmap = snd_imx_pcm_mmap, |
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.pcm_construct = snd_imx_pcm_new, |
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.pcm_destruct = snd_imx_pcm_free, |
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}; |
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int imx_pcm_fiq_init(struct platform_device *pdev, |
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struct imx_pcm_fiq_params *params) |
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{ |
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int ret; |
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ret = claim_fiq(&fh); |
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if (ret) { |
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dev_err(&pdev->dev, "failed to claim fiq: %d", ret); |
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return ret; |
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} |
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mxc_set_irq_fiq(params->irq, 1); |
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ssi_irq = params->irq; |
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imx_pcm_fiq = params->irq; |
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imx_ssi_fiq_base = (unsigned long)params->base; |
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params->dma_params_tx->maxburst = 4; |
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params->dma_params_rx->maxburst = 6; |
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ret = devm_snd_soc_register_component(&pdev->dev, &imx_soc_component_fiq, |
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NULL, 0); |
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if (ret) |
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goto failed_register; |
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return 0; |
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failed_register: |
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mxc_set_irq_fiq(ssi_irq, 0); |
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release_fiq(&fh); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(imx_pcm_fiq_init); |
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void imx_pcm_fiq_exit(struct platform_device *pdev) |
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{ |
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} |
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EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit); |
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MODULE_LICENSE("GPL");
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