504 строки
13 KiB
C
504 строки
13 KiB
C
/*
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* s3c24xx-i2s.c -- ALSA Soc Audio Layer
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*
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* (c) 2006 Wolfson Microelectronics PLC.
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* Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
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*
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* Copyright 2004-2005 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/jiffies.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/initval.h>
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#include <sound/soc.h>
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#include <mach/hardware.h>
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#include <mach/regs-gpio.h>
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#include <mach/regs-clock.h>
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#include <asm/dma.h>
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#include <mach/dma.h>
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#include <plat/regs-iis.h>
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#include "s3c-dma.h"
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#include "s3c24xx-i2s.h"
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static struct s3c2410_dma_client s3c24xx_dma_client_out = {
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.name = "I2S PCM Stereo out"
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};
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static struct s3c2410_dma_client s3c24xx_dma_client_in = {
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.name = "I2S PCM Stereo in"
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};
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static struct s3c_dma_params s3c24xx_i2s_pcm_stereo_out = {
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.client = &s3c24xx_dma_client_out,
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.channel = DMACH_I2S_OUT,
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.dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO,
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.dma_size = 2,
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};
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static struct s3c_dma_params s3c24xx_i2s_pcm_stereo_in = {
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.client = &s3c24xx_dma_client_in,
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.channel = DMACH_I2S_IN,
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.dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO,
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.dma_size = 2,
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};
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struct s3c24xx_i2s_info {
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void __iomem *regs;
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struct clk *iis_clk;
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u32 iiscon;
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u32 iismod;
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u32 iisfcon;
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u32 iispsr;
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};
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static struct s3c24xx_i2s_info s3c24xx_i2s;
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static void s3c24xx_snd_txctrl(int on)
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{
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u32 iisfcon;
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u32 iiscon;
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u32 iismod;
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pr_debug("Entered %s\n", __func__);
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iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
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iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
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iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
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pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
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if (on) {
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iisfcon |= S3C2410_IISFCON_TXDMA | S3C2410_IISFCON_TXENABLE;
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iiscon |= S3C2410_IISCON_TXDMAEN | S3C2410_IISCON_IISEN;
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iiscon &= ~S3C2410_IISCON_TXIDLE;
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iismod |= S3C2410_IISMOD_TXMODE;
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writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
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writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
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writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
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} else {
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/* note, we have to disable the FIFOs otherwise bad things
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* seem to happen when the DMA stops. According to the
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* Samsung supplied kernel, this should allow the DMA
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* engine and FIFOs to reset. If this isn't allowed, the
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* DMA engine will simply freeze randomly.
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*/
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iisfcon &= ~S3C2410_IISFCON_TXENABLE;
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iisfcon &= ~S3C2410_IISFCON_TXDMA;
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iiscon |= S3C2410_IISCON_TXIDLE;
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iiscon &= ~S3C2410_IISCON_TXDMAEN;
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iismod &= ~S3C2410_IISMOD_TXMODE;
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writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
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writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
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writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
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}
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pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
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}
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static void s3c24xx_snd_rxctrl(int on)
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{
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u32 iisfcon;
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u32 iiscon;
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u32 iismod;
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pr_debug("Entered %s\n", __func__);
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iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
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iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
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iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
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pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
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if (on) {
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iisfcon |= S3C2410_IISFCON_RXDMA | S3C2410_IISFCON_RXENABLE;
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iiscon |= S3C2410_IISCON_RXDMAEN | S3C2410_IISCON_IISEN;
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iiscon &= ~S3C2410_IISCON_RXIDLE;
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iismod |= S3C2410_IISMOD_RXMODE;
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writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
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writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
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writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
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} else {
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/* note, we have to disable the FIFOs otherwise bad things
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* seem to happen when the DMA stops. According to the
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* Samsung supplied kernel, this should allow the DMA
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* engine and FIFOs to reset. If this isn't allowed, the
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* DMA engine will simply freeze randomly.
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*/
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iisfcon &= ~S3C2410_IISFCON_RXENABLE;
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iisfcon &= ~S3C2410_IISFCON_RXDMA;
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iiscon |= S3C2410_IISCON_RXIDLE;
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iiscon &= ~S3C2410_IISCON_RXDMAEN;
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iismod &= ~S3C2410_IISMOD_RXMODE;
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writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
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writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
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writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
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}
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pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
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}
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/*
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* Wait for the LR signal to allow synchronisation to the L/R clock
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* from the codec. May only be needed for slave mode.
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*/
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static int s3c24xx_snd_lrsync(void)
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{
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u32 iiscon;
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int timeout = 50; /* 5ms */
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pr_debug("Entered %s\n", __func__);
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while (1) {
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iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
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if (iiscon & S3C2410_IISCON_LRINDEX)
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break;
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if (!timeout--)
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return -ETIMEDOUT;
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udelay(100);
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}
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return 0;
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}
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/*
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* Check whether CPU is the master or slave
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*/
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static inline int s3c24xx_snd_is_clkmaster(void)
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{
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pr_debug("Entered %s\n", __func__);
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return (readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & S3C2410_IISMOD_SLAVE) ? 0:1;
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}
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/*
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* Set S3C24xx I2S DAI format
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*/
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static int s3c24xx_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
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unsigned int fmt)
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{
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u32 iismod;
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pr_debug("Entered %s\n", __func__);
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iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
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pr_debug("hw_params r: IISMOD: %x \n", iismod);
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switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
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case SND_SOC_DAIFMT_CBM_CFM:
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iismod |= S3C2410_IISMOD_SLAVE;
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break;
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case SND_SOC_DAIFMT_CBS_CFS:
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iismod &= ~S3C2410_IISMOD_SLAVE;
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break;
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default:
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return -EINVAL;
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}
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switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_LEFT_J:
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iismod |= S3C2410_IISMOD_MSB;
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break;
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case SND_SOC_DAIFMT_I2S:
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iismod &= ~S3C2410_IISMOD_MSB;
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break;
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default:
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return -EINVAL;
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}
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writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
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pr_debug("hw_params w: IISMOD: %x \n", iismod);
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return 0;
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}
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static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct s3c_dma_params *dma_data;
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u32 iismod;
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pr_debug("Entered %s\n", __func__);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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dma_data = &s3c24xx_i2s_pcm_stereo_out;
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else
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dma_data = &s3c24xx_i2s_pcm_stereo_in;
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snd_soc_dai_set_dma_data(rtd->dai->cpu_dai, substream, dma_data);
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/* Working copies of register */
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iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
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pr_debug("hw_params r: IISMOD: %x\n", iismod);
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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_S8:
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iismod &= ~S3C2410_IISMOD_16BIT;
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dma_data->dma_size = 1;
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break;
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case SNDRV_PCM_FORMAT_S16_LE:
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iismod |= S3C2410_IISMOD_16BIT;
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dma_data->dma_size = 2;
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break;
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default:
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return -EINVAL;
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}
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writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
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pr_debug("hw_params w: IISMOD: %x\n", iismod);
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return 0;
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}
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static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
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struct snd_soc_dai *dai)
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{
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int ret = 0;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct s3c_dma_params *dma_data =
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snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
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pr_debug("Entered %s\n", __func__);
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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 (!s3c24xx_snd_is_clkmaster()) {
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ret = s3c24xx_snd_lrsync();
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if (ret)
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goto exit_err;
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}
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
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s3c24xx_snd_rxctrl(1);
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else
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s3c24xx_snd_txctrl(1);
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s3c2410_dma_ctrl(dma_data->channel, S3C2410_DMAOP_STARTED);
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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_CAPTURE)
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s3c24xx_snd_rxctrl(0);
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else
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s3c24xx_snd_txctrl(0);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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exit_err:
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return ret;
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}
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/*
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* Set S3C24xx Clock source
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*/
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static int s3c24xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
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int clk_id, unsigned int freq, int dir)
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{
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u32 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
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pr_debug("Entered %s\n", __func__);
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iismod &= ~S3C2440_IISMOD_MPLL;
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switch (clk_id) {
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case S3C24XX_CLKSRC_PCLK:
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break;
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case S3C24XX_CLKSRC_MPLL:
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iismod |= S3C2440_IISMOD_MPLL;
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break;
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default:
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return -EINVAL;
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}
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writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
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return 0;
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}
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/*
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* Set S3C24xx Clock dividers
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*/
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static int s3c24xx_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
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int div_id, int div)
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{
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u32 reg;
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pr_debug("Entered %s\n", __func__);
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switch (div_id) {
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case S3C24XX_DIV_BCLK:
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reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~S3C2410_IISMOD_FS_MASK;
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writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
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break;
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case S3C24XX_DIV_MCLK:
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reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~(S3C2410_IISMOD_384FS);
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writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
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break;
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case S3C24XX_DIV_PRESCALER:
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writel(div, s3c24xx_i2s.regs + S3C2410_IISPSR);
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reg = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
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writel(reg | S3C2410_IISCON_PSCEN, s3c24xx_i2s.regs + S3C2410_IISCON);
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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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/*
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* To avoid duplicating clock code, allow machine driver to
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* get the clockrate from here.
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*/
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u32 s3c24xx_i2s_get_clockrate(void)
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{
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return clk_get_rate(s3c24xx_i2s.iis_clk);
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}
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EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate);
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static int s3c24xx_i2s_probe(struct platform_device *pdev,
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struct snd_soc_dai *dai)
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{
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pr_debug("Entered %s\n", __func__);
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s3c24xx_i2s.regs = ioremap(S3C2410_PA_IIS, 0x100);
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if (s3c24xx_i2s.regs == NULL)
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return -ENXIO;
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s3c24xx_i2s.iis_clk = clk_get(&pdev->dev, "iis");
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if (s3c24xx_i2s.iis_clk == NULL) {
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pr_err("failed to get iis_clock\n");
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iounmap(s3c24xx_i2s.regs);
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return -ENODEV;
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}
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clk_enable(s3c24xx_i2s.iis_clk);
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/* Configure the I2S pins in correct mode */
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s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
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s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
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s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
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s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
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s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
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writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON);
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s3c24xx_snd_txctrl(0);
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s3c24xx_snd_rxctrl(0);
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return 0;
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}
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#ifdef CONFIG_PM
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static int s3c24xx_i2s_suspend(struct snd_soc_dai *cpu_dai)
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{
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pr_debug("Entered %s\n", __func__);
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s3c24xx_i2s.iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
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s3c24xx_i2s.iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
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s3c24xx_i2s.iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
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s3c24xx_i2s.iispsr = readl(s3c24xx_i2s.regs + S3C2410_IISPSR);
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clk_disable(s3c24xx_i2s.iis_clk);
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return 0;
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}
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static int s3c24xx_i2s_resume(struct snd_soc_dai *cpu_dai)
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{
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pr_debug("Entered %s\n", __func__);
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clk_enable(s3c24xx_i2s.iis_clk);
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|
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writel(s3c24xx_i2s.iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
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writel(s3c24xx_i2s.iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
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writel(s3c24xx_i2s.iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
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writel(s3c24xx_i2s.iispsr, s3c24xx_i2s.regs + S3C2410_IISPSR);
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define s3c24xx_i2s_suspend NULL
|
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#define s3c24xx_i2s_resume NULL
|
|
#endif
|
|
|
|
|
|
#define S3C24XX_I2S_RATES \
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(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
|
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SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
|
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SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
|
|
|
|
static struct snd_soc_dai_ops s3c24xx_i2s_dai_ops = {
|
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.trigger = s3c24xx_i2s_trigger,
|
|
.hw_params = s3c24xx_i2s_hw_params,
|
|
.set_fmt = s3c24xx_i2s_set_fmt,
|
|
.set_clkdiv = s3c24xx_i2s_set_clkdiv,
|
|
.set_sysclk = s3c24xx_i2s_set_sysclk,
|
|
};
|
|
|
|
struct snd_soc_dai s3c24xx_i2s_dai = {
|
|
.name = "s3c24xx-i2s",
|
|
.id = 0,
|
|
.probe = s3c24xx_i2s_probe,
|
|
.suspend = s3c24xx_i2s_suspend,
|
|
.resume = s3c24xx_i2s_resume,
|
|
.playback = {
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
.rates = S3C24XX_I2S_RATES,
|
|
.formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
|
|
.capture = {
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
.rates = S3C24XX_I2S_RATES,
|
|
.formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
|
|
.ops = &s3c24xx_i2s_dai_ops,
|
|
};
|
|
EXPORT_SYMBOL_GPL(s3c24xx_i2s_dai);
|
|
|
|
static int __init s3c24xx_i2s_init(void)
|
|
{
|
|
return snd_soc_register_dai(&s3c24xx_i2s_dai);
|
|
}
|
|
module_init(s3c24xx_i2s_init);
|
|
|
|
static void __exit s3c24xx_i2s_exit(void)
|
|
{
|
|
snd_soc_unregister_dai(&s3c24xx_i2s_dai);
|
|
}
|
|
module_exit(s3c24xx_i2s_exit);
|
|
|
|
/* Module information */
|
|
MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
|
|
MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
|
|
MODULE_LICENSE("GPL");
|