diff options
Diffstat (limited to 'kernel/sound/soc/samsung/s3c2412-i2s.c')
| -rw-r--r-- | kernel/sound/soc/samsung/s3c2412-i2s.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/kernel/sound/soc/samsung/s3c2412-i2s.c b/kernel/sound/soc/samsung/s3c2412-i2s.c new file mode 100644 index 000000000..2b766d212 --- /dev/null +++ b/kernel/sound/soc/samsung/s3c2412-i2s.c @@ -0,0 +1,192 @@ +/* sound/soc/samsung/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/delay.h> +#include <linux/gpio.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/module.h> + +#include <sound/soc.h> +#include <sound/pcm_params.h> + +#include <mach/dma.h> +#include <mach/gpio-samsung.h> +#include <plat/gpio-cfg.h> + +#include "dma.h" +#include "regs-i2s-v2.h" +#include "s3c2412-i2s.h" + +static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = { + .channel = DMACH_I2S_OUT, + .ch_name = "tx", + .dma_size = 4, +}; + +static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = { + .channel = DMACH_I2S_IN, + .ch_name = "rx", + .dma_size = 4, +}; + +static struct s3c_i2sv2_info s3c2412_i2s; + +static int s3c2412_i2s_probe(struct snd_soc_dai *dai) +{ + int ret; + + pr_debug("Entered %s\n", __func__); + + samsung_asoc_init_dma_data(dai, &s3c2412_i2s_pcm_stereo_out, + &s3c2412_i2s_pcm_stereo_in); + + ret = s3c_i2sv2_probe(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 = devm_clk_get(dai->dev, "i2sclk"); + if (IS_ERR(s3c2412_i2s.iis_cclk)) { + pr_err("failed to get i2sclk clock\n"); + return PTR_ERR(s3c2412_i2s.iis_cclk); + } + + /* Set MPLL as the source for IIS CLK */ + + clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll")); + clk_prepare_enable(s3c2412_i2s.iis_cclk); + + s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk; + + /* Configure the I2S pins (GPE0...GPE4) in correct mode */ + s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2), + S3C_GPIO_PULL_NONE); + + return 0; +} + +static int s3c2412_i2s_remove(struct snd_soc_dai *dai) +{ + clk_disable_unprepare(s3c2412_i2s.iis_cclk); + + return 0; +} + +static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *cpu_dai) +{ + struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai); + u32 iismod; + + pr_debug("Entered %s\n", __func__); + + iismod = readl(i2s->regs + S3C2412_IISMOD); + pr_debug("%s: r: IISMOD: %x\n", __func__, iismod); + + switch (params_width(params)) { + case 8: + iismod |= S3C2412_IISMOD_8BIT; + break; + case 16: + iismod &= ~S3C2412_IISMOD_8BIT; + break; + } + + writel(iismod, i2s->regs + S3C2412_IISMOD); + pr_debug("%s: w: IISMOD: %x\n", __func__, iismod); + + 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 const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = { + .hw_params = s3c2412_i2s_hw_params, +}; + +static struct snd_soc_dai_driver s3c2412_i2s_dai = { + .probe = s3c2412_i2s_probe, + .remove = s3c2412_i2s_remove, + .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, +}; + +static const struct snd_soc_component_driver s3c2412_i2s_component = { + .name = "s3c2412-i2s", +}; + +static int s3c2412_iis_dev_probe(struct platform_device *pdev) +{ + int ret = 0; + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(s3c2412_i2s.regs)) + return PTR_ERR(s3c2412_i2s.regs); + + s3c2412_i2s_pcm_stereo_out.dma_addr = res->start + S3C2412_IISTXD; + s3c2412_i2s_pcm_stereo_in.dma_addr = res->start + S3C2412_IISRXD; + + ret = s3c_i2sv2_register_component(&pdev->dev, -1, + &s3c2412_i2s_component, + &s3c2412_i2s_dai); + if (ret) { + pr_err("failed to register the dai\n"); + return ret; + } + + ret = samsung_asoc_dma_platform_register(&pdev->dev); + if (ret) + pr_err("failed to register the DMA: %d\n", ret); + + return ret; +} + +static struct platform_driver s3c2412_iis_driver = { + .probe = s3c2412_iis_dev_probe, + .driver = { + .name = "s3c2412-iis", + }, +}; + +module_platform_driver(s3c2412_iis_driver); + +/* Module information */ +MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); +MODULE_DESCRIPTION("S3C2412 I2S SoC Interface"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:s3c2412-iis"); |