471 lines
12 KiB
C
471 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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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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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <linux/module.h>
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#include <sound/soc.h>
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#include <sound/pcm_params.h>
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#include <mach/gpio-samsung.h>
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#include <plat/gpio-cfg.h>
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#include "regs-iis.h"
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#include "dma.h"
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#include "s3c24xx-i2s.h"
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static struct snd_dmaengine_dai_dma_data s3c24xx_i2s_pcm_stereo_out = {
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.chan_name = "tx",
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.addr_width = 2,
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};
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static struct snd_dmaengine_dai_dma_data s3c24xx_i2s_pcm_stereo_in = {
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.chan_name = "rx",
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.addr_width = 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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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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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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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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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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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_dmaengine_dai_dma_data *dma_data;
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u32 iismod;
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dma_data = snd_soc_dai_get_dma_data(dai, substream);
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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_width(params)) {
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case 8:
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iismod &= ~S3C2410_IISMOD_16BIT;
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dma_data->addr_width = 1;
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break;
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case 16:
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iismod |= S3C2410_IISMOD_16BIT;
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dma_data->addr_width = 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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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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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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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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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 snd_soc_dai *dai)
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{
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int ret;
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snd_soc_dai_init_dma_data(dai, &s3c24xx_i2s_pcm_stereo_out,
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&s3c24xx_i2s_pcm_stereo_in);
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s3c24xx_i2s.iis_clk = devm_clk_get(dai->dev, "iis");
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if (IS_ERR(s3c24xx_i2s.iis_clk)) {
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pr_err("failed to get iis_clock\n");
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return PTR_ERR(s3c24xx_i2s.iis_clk);
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}
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ret = clk_prepare_enable(s3c24xx_i2s.iis_clk);
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if (ret)
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return ret;
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/* Configure the I2S pins (GPE0...GPE4) in correct mode */
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s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
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S3C_GPIO_PULL_NONE);
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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_component *component)
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{
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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_unprepare(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_component *component)
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{
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int ret;
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ret = clk_prepare_enable(s3c24xx_i2s.iis_clk);
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if (ret)
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return ret;
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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);
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return 0;
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}
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#else
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#define s3c24xx_i2s_suspend NULL
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#define s3c24xx_i2s_resume NULL
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#endif
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#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)
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static const struct snd_soc_dai_ops s3c24xx_i2s_dai_ops = {
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.trigger = s3c24xx_i2s_trigger,
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.hw_params = s3c24xx_i2s_hw_params,
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.set_fmt = s3c24xx_i2s_set_fmt,
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.set_clkdiv = s3c24xx_i2s_set_clkdiv,
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.set_sysclk = s3c24xx_i2s_set_sysclk,
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};
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static struct snd_soc_dai_driver s3c24xx_i2s_dai = {
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.probe = s3c24xx_i2s_probe,
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.playback = {
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.channels_min = 2,
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.channels_max = 2,
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.rates = S3C24XX_I2S_RATES,
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.formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
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.capture = {
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.channels_min = 2,
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.channels_max = 2,
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.rates = S3C24XX_I2S_RATES,
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.formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
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.ops = &s3c24xx_i2s_dai_ops,
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};
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static const struct snd_soc_component_driver s3c24xx_i2s_component = {
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.name = "s3c24xx-i2s",
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.suspend = s3c24xx_i2s_suspend,
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.resume = s3c24xx_i2s_resume,
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};
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static int s3c24xx_iis_dev_probe(struct platform_device *pdev)
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{
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struct resource *res;
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int ret;
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s3c24xx_i2s.regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
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if (IS_ERR(s3c24xx_i2s.regs))
|
|
return PTR_ERR(s3c24xx_i2s.regs);
|
|
|
|
s3c24xx_i2s_pcm_stereo_out.addr = res->start + S3C2410_IISFIFO;
|
|
s3c24xx_i2s_pcm_stereo_in.addr = res->start + S3C2410_IISFIFO;
|
|
|
|
ret = samsung_asoc_dma_platform_register(&pdev->dev, NULL,
|
|
"tx", "rx", NULL);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed to register the DMA: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_snd_soc_register_component(&pdev->dev,
|
|
&s3c24xx_i2s_component, &s3c24xx_i2s_dai, 1);
|
|
if (ret)
|
|
dev_err(&pdev->dev, "Failed to register the DAI\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct platform_driver s3c24xx_iis_driver = {
|
|
.probe = s3c24xx_iis_dev_probe,
|
|
.driver = {
|
|
.name = "s3c24xx-iis",
|
|
},
|
|
};
|
|
|
|
module_platform_driver(s3c24xx_iis_driver);
|
|
|
|
/* Module information */
|
|
MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
|
|
MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:s3c24xx-iis");
|