/* sound/soc/s3c24xx/s3c2412-i2s.c * * ALSA Soc Audio Layer - S3C2412 I2S driver * * Copyright (c) 2006 Wolfson Microelectronics PLC. * Graeme Gregory graeme.gregory@wolfsonmicro.com * linux@wolfsonmicro.com * * Copyright (c) 2007, 2004-2005 Simtec Electronics * http://armlinux.simtec.co.uk/ * Ben Dooks <ben@simtec.co.uk> * * 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. */ #include <linux/init.h> #include <linux/module.h> #include <linux/device.h> #include <linux/delay.h> #include <linux/clk.h> #include <linux/kernel.h> #include <linux/io.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/initval.h> #include <sound/soc.h> #include <mach/hardware.h> #include <plat/regs-s3c2412-iis.h> #include <plat/regs-gpio.h> #include <plat/audio.h> #include <mach/dma.h> #include "s3c24xx-pcm.h" #include "s3c2412-i2s.h" #define S3C2412_I2S_DEBUG 0 static struct s3c2410_dma_client s3c2412_dma_client_out = { .name = "I2S PCM Stereo out" }; static struct s3c2410_dma_client s3c2412_dma_client_in = { .name = "I2S PCM Stereo in" }; static struct s3c24xx_pcm_dma_params s3c2412_i2s_pcm_stereo_out = { .client = &s3c2412_dma_client_out, .channel = DMACH_I2S_OUT, .dma_addr = S3C2410_PA_IIS + S3C2412_IISTXD, .dma_size = 4, }; static struct s3c24xx_pcm_dma_params s3c2412_i2s_pcm_stereo_in = { .client = &s3c2412_dma_client_in, .channel = DMACH_I2S_IN, .dma_addr = S3C2410_PA_IIS + S3C2412_IISRXD, .dma_size = 4, }; static struct s3c_i2sv2_info s3c2412_i2s; /* * Set S3C2412 Clock source */ static int s3c2412_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id, unsigned int freq, int dir) { u32 iismod = readl(s3c2412_i2s.regs + S3C2412_IISMOD); pr_debug("%s(%p, %d, %u, %d)\n", __func__, cpu_dai, clk_id, freq, dir); switch (clk_id) { case S3C2412_CLKSRC_PCLK: s3c2412_i2s.master = 1; iismod &= ~S3C2412_IISMOD_MASTER_MASK; iismod |= S3C2412_IISMOD_MASTER_INTERNAL; break; case S3C2412_CLKSRC_I2SCLK: s3c2412_i2s.master = 0; iismod &= ~S3C2412_IISMOD_MASTER_MASK; iismod |= S3C2412_IISMOD_MASTER_EXTERNAL; break; default: return -EINVAL; } writel(iismod, s3c2412_i2s.regs + S3C2412_IISMOD); return 0; } struct clk *s3c2412_get_iisclk(void) { return s3c2412_i2s.iis_clk; } EXPORT_SYMBOL_GPL(s3c2412_get_iisclk); static int s3c2412_i2s_probe(struct platform_device *pdev, struct snd_soc_dai *dai) { int ret; pr_debug("Entered %s\n", __func__); ret = s3c_i2sv2_probe(pdev, dai, &s3c2412_i2s, S3C2410_PA_IIS); if (ret) return ret; s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in; s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out; s3c2412_i2s.iis_cclk = clk_get(&pdev->dev, "i2sclk"); if (s3c2412_i2s.iis_cclk == NULL) { pr_debug("failed to get i2sclk clock\n"); iounmap(s3c2412_i2s.regs); return -ENODEV; } /* Set MPLL as the source for IIS CLK */ clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll")); clk_enable(s3c2412_i2s.iis_cclk); s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk; /* Configure the I2S pins in correct mode */ s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK); s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK); s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK); s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI); s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO); return 0; } #define S3C2412_I2S_RATES \ (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \ SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000) static struct snd_soc_dai_ops s3c2412_i2s_dai_ops = { .set_sysclk = s3c2412_i2s_set_sysclk, }; struct snd_soc_dai s3c2412_i2s_dai = { .name = "s3c2412-i2s", .id = 0, .probe = s3c2412_i2s_probe, .playback = { .channels_min = 2, .channels_max = 2, .rates = S3C2412_I2S_RATES, .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE, }, .capture = { .channels_min = 2, .channels_max = 2, .rates = S3C2412_I2S_RATES, .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE, }, .ops = &s3c2412_i2s_dai_ops, }; EXPORT_SYMBOL_GPL(s3c2412_i2s_dai); static int __init s3c2412_i2s_init(void) { return s3c_i2sv2_register_dai(&s3c2412_i2s_dai); } module_init(s3c2412_i2s_init); static void __exit s3c2412_i2s_exit(void) { snd_soc_unregister_dai(&s3c2412_i2s_dai); } module_exit(s3c2412_i2s_exit); /* Module information */ MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); MODULE_DESCRIPTION("S3C2412 I2S SoC Interface"); MODULE_LICENSE("GPL");