1/* sound/soc/s3c24xx/s3c2412-i2s.c 2 * 3 * ALSA Soc Audio Layer - S3C2412 I2S driver 4 * 5 * Copyright (c) 2006 Wolfson Microelectronics PLC. 6 * Graeme Gregory graeme.gregory@wolfsonmicro.com 7 * linux@wolfsonmicro.com 8 * 9 * Copyright (c) 2007, 2004-2005 Simtec Electronics 10 * http://armlinux.simtec.co.uk/ 11 * Ben Dooks <ben@simtec.co.uk> 12 * 13 * This program is free software; you can redistribute it and/or modify it 14 * under the terms of the GNU General Public License as published by the 15 * Free Software Foundation; either version 2 of the License, or (at your 16 * option) any later version. 17 */ 18 19#include <linux/init.h> 20#include <linux/module.h> 21#include <linux/device.h> 22#include <linux/delay.h> 23#include <linux/gpio.h> 24#include <linux/clk.h> 25#include <linux/kernel.h> 26#include <linux/io.h> 27 28#include <sound/core.h> 29#include <sound/pcm.h> 30#include <sound/pcm_params.h> 31#include <sound/initval.h> 32#include <sound/soc.h> 33#include <mach/hardware.h> 34 35#include <mach/regs-gpio.h> 36#include <mach/dma.h> 37 38#include "s3c-dma.h" 39#include "regs-i2s-v2.h" 40#include "s3c2412-i2s.h" 41 42#define S3C2412_I2S_DEBUG 0 43 44static struct s3c2410_dma_client s3c2412_dma_client_out = { 45 .name = "I2S PCM Stereo out" 46}; 47 48static struct s3c2410_dma_client s3c2412_dma_client_in = { 49 .name = "I2S PCM Stereo in" 50}; 51 52static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = { 53 .client = &s3c2412_dma_client_out, 54 .channel = DMACH_I2S_OUT, 55 .dma_addr = S3C2410_PA_IIS + S3C2412_IISTXD, 56 .dma_size = 4, 57}; 58 59static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = { 60 .client = &s3c2412_dma_client_in, 61 .channel = DMACH_I2S_IN, 62 .dma_addr = S3C2410_PA_IIS + S3C2412_IISRXD, 63 .dma_size = 4, 64}; 65 66static struct s3c_i2sv2_info s3c2412_i2s; 67 68static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai) 69{ 70 return cpu_dai->private_data; 71} 72 73static int s3c2412_i2s_probe(struct platform_device *pdev, 74 struct snd_soc_dai *dai) 75{ 76 int ret; 77 78 pr_debug("Entered %s\n", __func__); 79 80 ret = s3c_i2sv2_probe(pdev, dai, &s3c2412_i2s, S3C2410_PA_IIS); 81 if (ret) 82 return ret; 83 84 s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in; 85 s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out; 86 87 s3c2412_i2s.iis_cclk = clk_get(&pdev->dev, "i2sclk"); 88 if (s3c2412_i2s.iis_cclk == NULL) { 89 pr_err("failed to get i2sclk clock\n"); 90 iounmap(s3c2412_i2s.regs); 91 return -ENODEV; 92 } 93 94 /* Set MPLL as the source for IIS CLK */ 95 96 clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll")); 97 clk_enable(s3c2412_i2s.iis_cclk); 98 99 s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk; 100 101 /* Configure the I2S pins in correct mode */ 102 s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK); 103 s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK); 104 s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK); 105 s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI); 106 s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO); 107 108 return 0; 109} 110 111static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream, 112 struct snd_pcm_hw_params *params, 113 struct snd_soc_dai *cpu_dai) 114{ 115 struct s3c_i2sv2_info *i2s = to_info(cpu_dai); 116 struct s3c_dma_params *dma_data; 117 u32 iismod; 118 119 pr_debug("Entered %s\n", __func__); 120 121 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 122 dma_data = i2s->dma_playback; 123 else 124 dma_data = i2s->dma_capture; 125 126 snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data); 127 128 iismod = readl(i2s->regs + S3C2412_IISMOD); 129 pr_debug("%s: r: IISMOD: %x\n", __func__, iismod); 130 131 switch (params_format(params)) { 132 case SNDRV_PCM_FORMAT_S8: 133 iismod |= S3C2412_IISMOD_8BIT; 134 break; 135 case SNDRV_PCM_FORMAT_S16_LE: 136 iismod &= ~S3C2412_IISMOD_8BIT; 137 break; 138 } 139 140 writel(iismod, i2s->regs + S3C2412_IISMOD); 141 pr_debug("%s: w: IISMOD: %x\n", __func__, iismod); 142 143 return 0; 144} 145 146#define S3C2412_I2S_RATES \ 147 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \ 148 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ 149 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000) 150 151static struct snd_soc_dai_ops s3c2412_i2s_dai_ops = { 152 .hw_params = s3c2412_i2s_hw_params, 153}; 154 155struct snd_soc_dai s3c2412_i2s_dai = { 156 .name = "s3c2412-i2s", 157 .id = 0, 158 .probe = s3c2412_i2s_probe, 159 .playback = { 160 .channels_min = 2, 161 .channels_max = 2, 162 .rates = S3C2412_I2S_RATES, 163 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE, 164 }, 165 .capture = { 166 .channels_min = 2, 167 .channels_max = 2, 168 .rates = S3C2412_I2S_RATES, 169 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE, 170 }, 171 .ops = &s3c2412_i2s_dai_ops, 172}; 173EXPORT_SYMBOL_GPL(s3c2412_i2s_dai); 174 175static int __init s3c2412_i2s_init(void) 176{ 177 return s3c_i2sv2_register_dai(&s3c2412_i2s_dai); 178} 179module_init(s3c2412_i2s_init); 180 181static void __exit s3c2412_i2s_exit(void) 182{ 183 snd_soc_unregister_dai(&s3c2412_i2s_dai); 184} 185module_exit(s3c2412_i2s_exit); 186 187/* Module information */ 188MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); 189MODULE_DESCRIPTION("S3C2412 I2S SoC Interface"); 190MODULE_LICENSE("GPL"); 191