| /* |
| * imx-pcm-fiq.c -- ALSA Soc Audio Layer |
| * |
| * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de> |
| * |
| * This code is based on code copyrighted by Freescale, |
| * Liam Girdwood, Javier Martin and probably others. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| */ |
| #include <linux/clk.h> |
| #include <linux/delay.h> |
| #include <linux/device.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| |
| #include <sound/core.h> |
| #include <sound/dmaengine_pcm.h> |
| #include <sound/initval.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| #include <sound/soc.h> |
| |
| #include <asm/fiq.h> |
| |
| #include <linux/platform_data/asoc-imx-ssi.h> |
| |
| #include "imx-ssi.h" |
| #include "imx-pcm.h" |
| |
| struct imx_pcm_runtime_data { |
| unsigned int period; |
| int periods; |
| unsigned long offset; |
| struct hrtimer hrt; |
| int poll_time_ns; |
| struct snd_pcm_substream *substream; |
| atomic_t playing; |
| atomic_t capturing; |
| }; |
| |
| static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt) |
| { |
| struct imx_pcm_runtime_data *iprtd = |
| container_of(hrt, struct imx_pcm_runtime_data, hrt); |
| struct snd_pcm_substream *substream = iprtd->substream; |
| struct pt_regs regs; |
| |
| if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing)) |
| return HRTIMER_NORESTART; |
| |
| get_fiq_regs(®s); |
| |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| iprtd->offset = regs.ARM_r8 & 0xffff; |
| else |
| iprtd->offset = regs.ARM_r9 & 0xffff; |
| |
| snd_pcm_period_elapsed(substream); |
| |
| hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns)); |
| |
| return HRTIMER_RESTART; |
| } |
| |
| static struct fiq_handler fh = { |
| .name = DRV_NAME, |
| }; |
| |
| static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| |
| iprtd->periods = params_periods(params); |
| iprtd->period = params_period_bytes(params); |
| iprtd->offset = 0; |
| iprtd->poll_time_ns = 1000000000 / params_rate(params) * |
| params_period_size(params); |
| snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| |
| return 0; |
| } |
| |
| static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| struct pt_regs regs; |
| |
| get_fiq_regs(®s); |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16; |
| else |
| regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16; |
| |
| set_fiq_regs(®s); |
| |
| return 0; |
| } |
| |
| static int imx_pcm_fiq; |
| |
| static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| |
| switch (cmd) { |
| case SNDRV_PCM_TRIGGER_START: |
| case SNDRV_PCM_TRIGGER_RESUME: |
| case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| atomic_set(&iprtd->playing, 1); |
| else |
| atomic_set(&iprtd->capturing, 1); |
| hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns), |
| HRTIMER_MODE_REL); |
| enable_fiq(imx_pcm_fiq); |
| break; |
| |
| case SNDRV_PCM_TRIGGER_STOP: |
| case SNDRV_PCM_TRIGGER_SUSPEND: |
| case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| atomic_set(&iprtd->playing, 0); |
| else |
| atomic_set(&iprtd->capturing, 0); |
| if (!atomic_read(&iprtd->playing) && |
| !atomic_read(&iprtd->capturing)) |
| disable_fiq(imx_pcm_fiq); |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| |
| return bytes_to_frames(substream->runtime, iprtd->offset); |
| } |
| |
| static struct snd_pcm_hardware snd_imx_hardware = { |
| .info = SNDRV_PCM_INFO_INTERLEAVED | |
| SNDRV_PCM_INFO_BLOCK_TRANSFER | |
| SNDRV_PCM_INFO_MMAP | |
| SNDRV_PCM_INFO_MMAP_VALID | |
| SNDRV_PCM_INFO_PAUSE | |
| SNDRV_PCM_INFO_RESUME, |
| .formats = SNDRV_PCM_FMTBIT_S16_LE, |
| .rate_min = 8000, |
| .channels_min = 2, |
| .channels_max = 2, |
| .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, |
| .period_bytes_min = 128, |
| .period_bytes_max = 16 * 1024, |
| .periods_min = 4, |
| .periods_max = 255, |
| .fifo_size = 0, |
| }; |
| |
| static int snd_imx_open(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct imx_pcm_runtime_data *iprtd; |
| int ret; |
| |
| iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); |
| if (iprtd == NULL) |
| return -ENOMEM; |
| runtime->private_data = iprtd; |
| |
| iprtd->substream = substream; |
| |
| atomic_set(&iprtd->playing, 0); |
| atomic_set(&iprtd->capturing, 0); |
| hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| iprtd->hrt.function = snd_hrtimer_callback; |
| |
| ret = snd_pcm_hw_constraint_integer(substream->runtime, |
| SNDRV_PCM_HW_PARAM_PERIODS); |
| if (ret < 0) { |
| kfree(iprtd); |
| return ret; |
| } |
| |
| snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); |
| return 0; |
| } |
| |
| static int snd_imx_close(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| |
| hrtimer_cancel(&iprtd->hrt); |
| |
| kfree(iprtd); |
| |
| return 0; |
| } |
| |
| static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream, |
| struct vm_area_struct *vma) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| int ret; |
| |
| ret = dma_mmap_writecombine(substream->pcm->card->dev, vma, |
| runtime->dma_area, runtime->dma_addr, runtime->dma_bytes); |
| |
| pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret, |
| runtime->dma_area, |
| runtime->dma_addr, |
| runtime->dma_bytes); |
| return ret; |
| } |
| |
| static struct snd_pcm_ops imx_pcm_ops = { |
| .open = snd_imx_open, |
| .close = snd_imx_close, |
| .ioctl = snd_pcm_lib_ioctl, |
| .hw_params = snd_imx_pcm_hw_params, |
| .prepare = snd_imx_pcm_prepare, |
| .trigger = snd_imx_pcm_trigger, |
| .pointer = snd_imx_pcm_pointer, |
| .mmap = snd_imx_pcm_mmap, |
| }; |
| |
| static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) |
| { |
| struct snd_pcm_substream *substream = pcm->streams[stream].substream; |
| struct snd_dma_buffer *buf = &substream->dma_buffer; |
| size_t size = IMX_SSI_DMABUF_SIZE; |
| |
| buf->dev.type = SNDRV_DMA_TYPE_DEV; |
| buf->dev.dev = pcm->card->dev; |
| buf->private_data = NULL; |
| buf->area = dma_alloc_writecombine(pcm->card->dev, size, |
| &buf->addr, GFP_KERNEL); |
| if (!buf->area) |
| return -ENOMEM; |
| buf->bytes = size; |
| |
| return 0; |
| } |
| |
| static u64 imx_pcm_dmamask = DMA_BIT_MASK(32); |
| |
| static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd) |
| { |
| struct snd_card *card = rtd->card->snd_card; |
| struct snd_pcm *pcm = rtd->pcm; |
| int ret = 0; |
| |
| if (!card->dev->dma_mask) |
| card->dev->dma_mask = &imx_pcm_dmamask; |
| if (!card->dev->coherent_dma_mask) |
| card->dev->coherent_dma_mask = DMA_BIT_MASK(32); |
| if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { |
| ret = imx_pcm_preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_PLAYBACK); |
| if (ret) |
| goto out; |
| } |
| |
| if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { |
| ret = imx_pcm_preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_CAPTURE); |
| if (ret) |
| goto out; |
| } |
| |
| out: |
| return ret; |
| } |
| |
| static int ssi_irq = 0; |
| |
| static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd) |
| { |
| struct snd_pcm *pcm = rtd->pcm; |
| struct snd_pcm_substream *substream; |
| int ret; |
| |
| ret = imx_pcm_new(rtd); |
| if (ret) |
| return ret; |
| |
| substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; |
| if (substream) { |
| struct snd_dma_buffer *buf = &substream->dma_buffer; |
| |
| imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; |
| } |
| |
| substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; |
| if (substream) { |
| struct snd_dma_buffer *buf = &substream->dma_buffer; |
| |
| imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; |
| } |
| |
| set_fiq_handler(&imx_ssi_fiq_start, |
| &imx_ssi_fiq_end - &imx_ssi_fiq_start); |
| |
| return 0; |
| } |
| |
| static void imx_pcm_free(struct snd_pcm *pcm) |
| { |
| struct snd_pcm_substream *substream; |
| struct snd_dma_buffer *buf; |
| int stream; |
| |
| for (stream = 0; stream < 2; stream++) { |
| substream = pcm->streams[stream].substream; |
| if (!substream) |
| continue; |
| |
| buf = &substream->dma_buffer; |
| if (!buf->area) |
| continue; |
| |
| dma_free_writecombine(pcm->card->dev, buf->bytes, |
| buf->area, buf->addr); |
| buf->area = NULL; |
| } |
| } |
| |
| static void imx_pcm_fiq_free(struct snd_pcm *pcm) |
| { |
| mxc_set_irq_fiq(ssi_irq, 0); |
| release_fiq(&fh); |
| imx_pcm_free(pcm); |
| } |
| |
| static struct snd_soc_platform_driver imx_soc_platform_fiq = { |
| .ops = &imx_pcm_ops, |
| .pcm_new = imx_pcm_fiq_new, |
| .pcm_free = imx_pcm_fiq_free, |
| }; |
| |
| int imx_pcm_fiq_init(struct platform_device *pdev, |
| struct imx_pcm_fiq_params *params) |
| { |
| int ret; |
| |
| ret = claim_fiq(&fh); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to claim fiq: %d", ret); |
| return ret; |
| } |
| |
| mxc_set_irq_fiq(params->irq, 1); |
| ssi_irq = params->irq; |
| |
| imx_pcm_fiq = params->irq; |
| |
| imx_ssi_fiq_base = (unsigned long)params->base; |
| |
| params->dma_params_tx->maxburst = 4; |
| params->dma_params_rx->maxburst = 6; |
| |
| ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq); |
| if (ret) |
| goto failed_register; |
| |
| return 0; |
| |
| failed_register: |
| mxc_set_irq_fiq(ssi_irq, 0); |
| release_fiq(&fh); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(imx_pcm_fiq_init); |
| |
| void imx_pcm_fiq_exit(struct platform_device *pdev) |
| { |
| snd_soc_unregister_platform(&pdev->dev); |
| } |
| EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit); |
| |
| MODULE_LICENSE("GPL"); |