path: root/sound/soc/pxa/pxa-ssp.c

/*
 * pxa-ssp.c  --  ALSA Soc Audio Layer
 *
 * Copyright 2005,2008 Wolfson Microelectronics PLC.
 * Author: Liam Girdwood
 *         Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 *  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.
 *
 * TODO:
 *  o Test network mode for > 16bit sample size
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/io.h>

#include <asm/irq.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/pxa2xx-lib.h>

#include <mach/hardware.h>
#include <mach/dma.h>
#include <mach/regs-ssp.h>
#include <mach/audio.h>
#include <mach/ssp.h>

#include "pxa2xx-pcm.h"
#include "pxa-ssp.h"

/*
 * SSP audio private data
 */
struct ssp_priv {
	struct ssp_dev dev;
	unsigned int sysclk;
	int dai_fmt;
#ifdef CONFIG_PM
	struct ssp_state state;
#endif
};

static void dump_registers(struct ssp_device *ssp)
{
	dev_dbg(&ssp->pdev->dev, "SSCR0 0x%08x SSCR1 0x%08x SSTO 0x%08x\n",
		 ssp_read_reg(ssp, SSCR0), ssp_read_reg(ssp, SSCR1),
		 ssp_read_reg(ssp, SSTO));

	dev_dbg(&ssp->pdev->dev, "SSPSP 0x%08x SSSR 0x%08x SSACD 0x%08x\n",
		 ssp_read_reg(ssp, SSPSP), ssp_read_reg(ssp, SSSR),
		 ssp_read_reg(ssp, SSACD));
}

struct pxa2xx_pcm_dma_data {
	struct pxa2xx_pcm_dma_params params;
	char name[20];
};

static struct pxa2xx_pcm_dma_params *
ssp_get_dma_params(struct ssp_device *ssp, int width4, int out)
{
	struct pxa2xx_pcm_dma_data *dma;

	dma = kzalloc(sizeof(struct pxa2xx_pcm_dma_data), GFP_KERNEL);
	if (dma == NULL)
		return NULL;

	snprintf(dma->name, 20, "SSP%d PCM %s %s", ssp->port_id,
			width4 ? "32-bit" : "16-bit", out ? "out" : "in");

	dma->params.name = dma->name;
	dma->params.drcmr = &DRCMR(out ? ssp->drcmr_tx : ssp->drcmr_rx);
	dma->params.dcmd = (out ? (DCMD_INCSRCADDR | DCMD_FLOWTRG) :
				  (DCMD_INCTRGADDR | DCMD_FLOWSRC)) |
			(width4 ? DCMD_WIDTH4 : DCMD_WIDTH2) | DCMD_BURST16;
	dma->params.dev_addr = ssp->phys_base + SSDR;

	return &dma->params;
}

static int pxa_ssp_startup(struct snd_pcm_substream *substream,
			   struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
	struct ssp_priv *priv = cpu_dai->private_data;
	int ret = 0;

	if (!cpu_dai->active) {
		priv->dev.port = cpu_dai->id + 1;
		priv->dev.irq = NO_IRQ;
		clk_enable(priv->dev.ssp->clk);
		ssp_disable(&priv->dev);
	}

	if (cpu_dai->dma_data) {
		kfree(cpu_dai->dma_data);
		cpu_dai->dma_data = NULL;
	}
	return ret;
}

static void pxa_ssp_shutdown(struct snd_pcm_substream *substream,
			     struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
	struct ssp_priv *priv = cpu_dai->private_data;

	if (!cpu_dai->active) {
		ssp_disable(&priv->dev);
		clk_disable(priv->dev.ssp->clk);
	}

	if (cpu_dai->dma_data) {
		kfree(cpu_dai->dma_data);
		cpu_dai->dma_data = NULL;
	}
}

#ifdef CONFIG_PM

static int pxa_ssp_suspend(struct snd_soc_dai *cpu_dai)
{
	struct ssp_priv *priv = cpu_dai->private_data;

	if (!cpu_dai->active)
		return 0;

	ssp_save_state(&priv->dev, &priv->state);
	clk_disable(priv->dev.ssp->clk);
	return 0;
}

static int pxa_ssp_resume(struct snd_soc_dai *cpu_dai)
{
	struct ssp_priv *priv = cpu_dai->private_data;

	if (!cpu_dai->active)
		return 0;

	clk_enable(priv->dev.ssp->clk);
	ssp_restore_state(&priv->dev, &priv->state);
	ssp_enable(&priv->dev);

	return 0;
}

#else
#define pxa_ssp_suspend	NULL
#define pxa_ssp_resume	NULL
#endif

/**
 * ssp_set_clkdiv - set SSP clock divider
 * @div: serial clock rate divider
 */
static void ssp_set_scr(struct ssp_device *ssp, u32 div)
{
	u32 sscr0 = ssp_read_reg(ssp, SSCR0);

	if (cpu_is_pxa25x() && ssp->type == PXA25x_SSP) {
		sscr0 &= ~0x0000ff00;
		sscr0 |= ((div - 2)/2) << 8; /* 2..512 */
	} else {
		sscr0 &= ~0x000fff00;
		sscr0 |= (div - 1) << 8;