ASoC: atmel-pcm: split into two file (92dfa619) · Commits · 戴 / test

sound/soc/atmel/Kconfig

+5 −0

Original line number	Diff line number	Diff line
		@@ -6,6 +6,10 @@ config SND_ATMEL_SOC
		the ATMEL SSC interface. You will also need
		to select the audio interfaces to support below.

		config SND_ATMEL_SOC_PDC
		tristate
		depends on SND_ATMEL_SOC

		config SND_ATMEL_SOC_SSC
		tristate
		depends on SND_ATMEL_SOC
		@@ -17,6 +21,7 @@ config SND_ATMEL_SOC_SSC
		config SND_AT91_SOC_SAM9G20_WM8731
		tristate "SoC Audio support for WM8731-based At91sam9g20 evaluation board"
		depends on ATMEL_SSC && SND_ATMEL_SOC && AT91_PROGRAMMABLE_CLOCKS
		select SND_ATMEL_SOC_PDC
		select SND_ATMEL_SOC_SSC
		select SND_SOC_WM8731
		help

sound/soc/atmel/Makefile

+2 −0

Original line number	Diff line number	Diff line
		# AT91 Platform Support
		snd-soc-atmel-pcm-objs := atmel-pcm.o
		snd-soc-atmel-pcm-pdc-objs := atmel-pcm-pdc.o
		snd-soc-atmel_ssc_dai-objs := atmel_ssc_dai.o

		obj-$(CONFIG_SND_ATMEL_SOC) += snd-soc-atmel-pcm.o
		obj-$(CONFIG_SND_ATMEL_SOC_PDC) += snd-soc-atmel-pcm-pdc.o
		obj-$(CONFIG_SND_ATMEL_SOC_SSC) += snd-soc-atmel_ssc_dai.o

		# AT91 Machine Support

sound/soc/atmel/atmel-pcm-pdc.c

0 → 100644

+401 −0

Original line number	Diff line number	Diff line
		/*
		* atmel-pcm.c -- ALSA PCM interface for the Atmel atmel SoC.
		*
		* Copyright (C) 2005 SAN People
		* Copyright (C) 2008 Atmel
		*
		* Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
		*
		* Based on at91-pcm. by:
		* Frank Mandarino <fmandarino@endrelia.com>
		* Copyright 2006 Endrelia Technologies Inc.
		*
		* Based on pxa2xx-pcm.c by:
		*
		* Author: Nicolas Pitre
		* Created: Nov 30, 2004
		* Copyright: (C) 2004 MontaVista Software, Inc.
		*
		* 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.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*/

		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/platform_device.h>
		#include <linux/slab.h>
		#include <linux/dma-mapping.h>
		#include <linux/atmel_pdc.h>
		#include <linux/atmel-ssc.h>

		#include <sound/core.h>
		#include <sound/pcm.h>
		#include <sound/pcm_params.h>
		#include <sound/soc.h>

		#include "atmel-pcm.h"


		/--------------------------------------------------------------------------\
		* Hardware definition
		\--------------------------------------------------------------------------/
		/* TODO: These values were taken from the AT91 platform driver, check
		* them against real values for AT32
		*/
		static const struct snd_pcm_hardware atmel_pcm_hardware = {
		.info = SNDRV_PCM_INFO_MMAP \|
		SNDRV_PCM_INFO_MMAP_VALID \|
		SNDRV_PCM_INFO_INTERLEAVED \|
		SNDRV_PCM_INFO_PAUSE,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
		.period_bytes_min = 32,
		.period_bytes_max = 8192,
		.periods_min = 2,
		.periods_max = 1024,
		.buffer_bytes_max = ATMEL_SSC_DMABUF_SIZE,
		};


		/--------------------------------------------------------------------------\
		* Data types
		\--------------------------------------------------------------------------/
		struct atmel_runtime_data {
		struct atmel_pcm_dma_params *params;
		dma_addr_t dma_buffer; /* physical address of dma buffer */
		dma_addr_t dma_buffer_end; /* first address beyond DMA buffer */
		size_t period_size;

		dma_addr_t period_ptr; /* physical address of next period */

		/* PDC register save */
		u32 pdc_xpr_save;
		u32 pdc_xcr_save;
		u32 pdc_xnpr_save;
		u32 pdc_xncr_save;
		};

		/--------------------------------------------------------------------------\
		* ISR
		\--------------------------------------------------------------------------/
		static void atmel_pcm_dma_irq(u32 ssc_sr,
		struct snd_pcm_substream *substream)
		{
		struct atmel_runtime_data *prtd = substream->runtime->private_data;
		struct atmel_pcm_dma_params *params = prtd->params;
		static int count;

		count++;

		if (ssc_sr & params->mask->ssc_endbuf) {
		pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x, count=%d)\n",
		substream->stream == SNDRV_PCM_STREAM_PLAYBACK
		? "underrun" : "overrun",
		params->name, ssc_sr, count);

		/* re-start the PDC */
		ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
		params->mask->pdc_disable);
		prtd->period_ptr += prtd->period_size;
		if (prtd->period_ptr >= prtd->dma_buffer_end)
		prtd->period_ptr = prtd->dma_buffer;

		ssc_writex(params->ssc->regs, params->pdc->xpr,
		prtd->period_ptr);
		ssc_writex(params->ssc->regs, params->pdc->xcr,
		prtd->period_size / params->pdc_xfer_size);
		ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
		params->mask->pdc_enable);
		}

		if (ssc_sr & params->mask->ssc_endx) {
		/* Load the PDC next pointer and counter registers */
		prtd->period_ptr += prtd->period_size;
		if (prtd->period_ptr >= prtd->dma_buffer_end)
		prtd->period_ptr = prtd->dma_buffer;

		ssc_writex(params->ssc->regs, params->pdc->xnpr,
		prtd->period_ptr);
		ssc_writex(params->ssc->regs, params->pdc->xncr,
		prtd->period_size / params->pdc_xfer_size);
		}

		snd_pcm_period_elapsed(substream);
		}


		/--------------------------------------------------------------------------\
		* PCM operations
		\--------------------------------------------------------------------------/
		static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params)
		{
		struct snd_pcm_runtime *runtime = substream->runtime;
		struct atmel_runtime_data *prtd = runtime->private_data;
		struct snd_soc_pcm_runtime *rtd = substream->private_data;

		/* this may get called several times by oss emulation
		* with different params */

		snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
		runtime->dma_bytes = params_buffer_bytes(params);

		prtd->params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
		prtd->params->dma_intr_handler = atmel_pcm_dma_irq;

		prtd->dma_buffer = runtime->dma_addr;
		prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
		prtd->period_size = params_period_bytes(params);

		pr_debug("atmel-pcm: "
		"hw_params: DMA for %s initialized "
		"(dma_bytes=%u, period_size=%u)\n",
		prtd->params->name,
		runtime->dma_bytes,
		prtd->period_size);
		return 0;
		}

		static int atmel_pcm_hw_free(struct snd_pcm_substream *substream)
		{
		struct atmel_runtime_data *prtd = substream->runtime->private_data;
		struct atmel_pcm_dma_params *params = prtd->params;

		if (params != NULL) {
		ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
		params->mask->pdc_disable);
		prtd->params->dma_intr_handler = NULL;
		}

		return 0;
		}

		static int atmel_pcm_prepare(struct snd_pcm_substream *substream)
		{
		struct atmel_runtime_data *prtd = substream->runtime->private_data;
		struct atmel_pcm_dma_params *params = prtd->params;

		ssc_writex(params->ssc->regs, SSC_IDR,
		params->mask->ssc_endx \| params->mask->ssc_endbuf);
		ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
		params->mask->pdc_disable);
		return 0;
		}

		static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
		int cmd)
		{
		struct snd_pcm_runtime *rtd = substream->runtime;
		struct atmel_runtime_data *prtd = rtd->private_data;
		struct atmel_pcm_dma_params *params = prtd->params;
		int ret = 0;

		pr_debug("atmel-pcm:buffer_size = %ld,"
		"dma_area = %p, dma_bytes = %u\n",
		rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);

		switch (cmd) {
		case SNDRV_PCM_TRIGGER_START:
		prtd->period_ptr = prtd->dma_buffer;

		ssc_writex(params->ssc->regs, params->pdc->xpr,
		prtd->period_ptr);
		ssc_writex(params->ssc->regs, params->pdc->xcr,
		prtd->period_size / params->pdc_xfer_size);

		prtd->period_ptr += prtd->period_size;
		ssc_writex(params->ssc->regs, params->pdc->xnpr,
		prtd->period_ptr);
		ssc_writex(params->ssc->regs, params->pdc->xncr,
		prtd->period_size / params->pdc_xfer_size);

		pr_debug("atmel-pcm: trigger: "
		"period_ptr=%lx, xpr=%u, "
		"xcr=%u, xnpr=%u, xncr=%u\n",
		(unsigned long)prtd->period_ptr,
		ssc_readx(params->ssc->regs, params->pdc->xpr),
		ssc_readx(params->ssc->regs, params->pdc->xcr),
		ssc_readx(params->ssc->regs, params->pdc->xnpr),
		ssc_readx(params->ssc->regs, params->pdc->xncr));

		ssc_writex(params->ssc->regs, SSC_IER,
		params->mask->ssc_endx \| params->mask->ssc_endbuf);
		ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
		params->mask->pdc_enable);

		pr_debug("sr=%u imr=%u\n",
		ssc_readx(params->ssc->regs, SSC_SR),
		ssc_readx(params->ssc->regs, SSC_IER));
		break; /* SNDRV_PCM_TRIGGER_START */

		case SNDRV_PCM_TRIGGER_STOP:
		case SNDRV_PCM_TRIGGER_SUSPEND:
		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
		params->mask->pdc_disable);
		break;

		case SNDRV_PCM_TRIGGER_RESUME:
		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
		params->mask->pdc_enable);
		break;

		default:
		ret = -EINVAL;
		}

		return ret;
		}

		static snd_pcm_uframes_t atmel_pcm_pointer(
		struct snd_pcm_substream *substream)
		{
		struct snd_pcm_runtime *runtime = substream->runtime;
		struct atmel_runtime_data *prtd = runtime->private_data;
		struct atmel_pcm_dma_params *params = prtd->params;
		dma_addr_t ptr;
		snd_pcm_uframes_t x;

		ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr);
		x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);

		if (x == runtime->buffer_size)
		x = 0;

		return x;
		}

		static int atmel_pcm_open(struct snd_pcm_substream *substream)
		{
		struct snd_pcm_runtime *runtime = substream->runtime;
		struct atmel_runtime_data *prtd;
		int ret = 0;

		snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware);

		/* ensure that buffer size is a multiple of period size */
		ret = snd_pcm_hw_constraint_integer(runtime,
		SNDRV_PCM_HW_PARAM_PERIODS);
		if (ret < 0)
		goto out;

		prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL);
		if (prtd == NULL) {
		ret = -ENOMEM;
		goto out;
		}
		runtime->private_data = prtd;

		out:
		return ret;
		}

		static int atmel_pcm_close(struct snd_pcm_substream *substream)
		{
		struct atmel_runtime_data *prtd = substream->runtime->private_data;

		kfree(prtd);
		return 0;
		}

		static struct snd_pcm_ops atmel_pcm_ops = {
		.open = atmel_pcm_open,
		.close = atmel_pcm_close,
		.ioctl = snd_pcm_lib_ioctl,
		.hw_params = atmel_pcm_hw_params,
		.hw_free = atmel_pcm_hw_free,
		.prepare = atmel_pcm_prepare,
		.trigger = atmel_pcm_trigger,
		.pointer = atmel_pcm_pointer,
		.mmap = atmel_pcm_mmap,
		};


		/--------------------------------------------------------------------------\
		* ASoC platform driver
		\--------------------------------------------------------------------------/
		#ifdef CONFIG_PM
		static int atmel_pcm_suspend(struct snd_soc_dai *dai)
		{
		struct snd_pcm_runtime *runtime = dai->runtime;
		struct atmel_runtime_data *prtd;
		struct atmel_pcm_dma_params *params;

		if (!runtime)
		return 0;

		prtd = runtime->private_data;
		params = prtd->params;

		/* disable the PDC and save the PDC registers */

		ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_disable);

		prtd->pdc_xpr_save = ssc_readx(params->ssc->regs, params->pdc->xpr);
		prtd->pdc_xcr_save = ssc_readx(params->ssc->regs, params->pdc->xcr);
		prtd->pdc_xnpr_save = ssc_readx(params->ssc->regs, params->pdc->xnpr);
		prtd->pdc_xncr_save = ssc_readx(params->ssc->regs, params->pdc->xncr);

		return 0;
		}

		static int atmel_pcm_resume(struct snd_soc_dai *dai)
		{
		struct snd_pcm_runtime *runtime = dai->runtime;
		struct atmel_runtime_data *prtd;
		struct atmel_pcm_dma_params *params;

		if (!runtime)
		return 0;

		prtd = runtime->private_data;
		params = prtd->params;

		/* restore the PDC registers and enable the PDC */
		ssc_writex(params->ssc->regs, params->pdc->xpr, prtd->pdc_xpr_save);
		ssc_writex(params->ssc->regs, params->pdc->xcr, prtd->pdc_xcr_save);
		ssc_writex(params->ssc->regs, params->pdc->xnpr, prtd->pdc_xnpr_save);
		ssc_writex(params->ssc->regs, params->pdc->xncr, prtd->pdc_xncr_save);

		ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_enable);
		return 0;
		}
		#else
		#define atmel_pcm_suspend NULL
		#define atmel_pcm_resume NULL
		#endif

		static struct snd_soc_platform_driver atmel_soc_platform = {
		.ops = &atmel_pcm_ops,
		.pcm_new = atmel_pcm_new,
		.pcm_free = atmel_pcm_free,
		.suspend = atmel_pcm_suspend,
		.resume = atmel_pcm_resume,
		};

		int atmel_pcm_pdc_platform_register(struct device *dev)
		{
		return snd_soc_register_platform(dev, &atmel_soc_platform);
		}
		EXPORT_SYMBOL(atmel_pcm_pdc_platform_register);

		void atmel_pcm_pdc_platform_unregister(struct device *dev)
		{
		snd_soc_unregister_platform(dev);
		}
		EXPORT_SYMBOL(atmel_pcm_pdc_platform_unregister);

		MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
		MODULE_DESCRIPTION("Atmel PCM module");
		MODULE_LICENSE("GPL");

sound/soc/atmel/atmel-pcm.c

+12 −378

File changed.

Preview size limit exceeded, changes collapsed.

sound/soc/atmel/atmel-pcm.h

+19 −2

Original line number	Diff line number	Diff line
		@@ -36,6 +36,8 @@

		#include <linux/atmel-ssc.h>

		#define ATMEL_SSC_DMABUF_SIZE (64 * 1024)

		/*
		* Registers and status bits that are required by the PCM driver.
		*/
		@@ -80,7 +82,22 @@ struct atmel_pcm_dma_params {
		#define ssc_readx(base, reg) (__raw_readl((base) + (reg)))
		#define ssc_writex(base, reg, value) __raw_writel((value), (base) + (reg))

		int atmel_pcm_platform_register(struct device *dev);
		void atmel_pcm_platform_unregister(struct device *dev);
		int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd);
		void atmel_pcm_free(struct snd_pcm *pcm);
		int atmel_pcm_mmap(struct snd_pcm_substream *substream,
		struct vm_area_struct *vma);

		#ifdef CONFIG_SND_ATMEL_SOC_PDC
		int atmel_pcm_pdc_platform_register(struct device *dev);
		void atmel_pcm_pdc_platform_unregister(struct device *dev);
		#else
		static inline int atmel_pcm_pdc_platform_register(struct device *dev)
		{
		return 0;
		}
		static inline void atmel_pcm_pdc_platform_unregister(struct device *dev)
		{
		}
		#endif

		#endif /* _ATMEL_PCM_H */

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