diff options
Diffstat (limited to 'sound/soc/ep93xx/ep93xx-i2s.c')
| -rw-r--r-- | sound/soc/ep93xx/ep93xx-i2s.c | 451 |
1 files changed, 0 insertions, 451 deletions
diff --git a/sound/soc/ep93xx/ep93xx-i2s.c b/sound/soc/ep93xx/ep93xx-i2s.c deleted file mode 100644 index 8df8f6dc474f..000000000000 --- a/sound/soc/ep93xx/ep93xx-i2s.c +++ /dev/null @@ -1,451 +0,0 @@ -/* - * linux/sound/soc/ep93xx-i2s.c - * EP93xx I2S driver - * - * Copyright (C) 2010 Ryan Mallon - * - * Based on the original driver by: - * Copyright (C) 2007 Chase Douglas <chasedouglas@gmail> - * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - */ - -#include <linux/module.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/clk.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 <mach/ep93xx-regs.h> -#include <mach/dma.h> - -#include "ep93xx-pcm.h" - -#define EP93XX_I2S_TXCLKCFG 0x00 -#define EP93XX_I2S_RXCLKCFG 0x04 -#define EP93XX_I2S_GLCTRL 0x0C - -#define EP93XX_I2S_TXLINCTRLDATA 0x28 -#define EP93XX_I2S_TXCTRL 0x2C -#define EP93XX_I2S_TXWRDLEN 0x30 -#define EP93XX_I2S_TX0EN 0x34 - -#define EP93XX_I2S_RXLINCTRLDATA 0x58 -#define EP93XX_I2S_RXCTRL 0x5C -#define EP93XX_I2S_RXWRDLEN 0x60 -#define EP93XX_I2S_RX0EN 0x64 - -#define EP93XX_I2S_WRDLEN_16 (0 << 0) -#define EP93XX_I2S_WRDLEN_24 (1 << 0) -#define EP93XX_I2S_WRDLEN_32 (2 << 0) - -#define EP93XX_I2S_LINCTRLDATA_R_JUST (1 << 2) /* Right justify */ - -#define EP93XX_I2S_CLKCFG_LRS (1 << 0) /* lrclk polarity */ -#define EP93XX_I2S_CLKCFG_CKP (1 << 1) /* Bit clock polarity */ -#define EP93XX_I2S_CLKCFG_REL (1 << 2) /* First bit transition */ -#define EP93XX_I2S_CLKCFG_MASTER (1 << 3) /* Master mode */ -#define EP93XX_I2S_CLKCFG_NBCG (1 << 4) /* Not bit clock gating */ - -struct ep93xx_i2s_info { - struct clk *mclk; - struct clk *sclk; - struct clk *lrclk; - struct ep93xx_pcm_dma_params *dma_params; - void __iomem *regs; -}; - -struct ep93xx_pcm_dma_params ep93xx_i2s_dma_params[] = { - [SNDRV_PCM_STREAM_PLAYBACK] = { - .name = "i2s-pcm-out", - .dma_port = EP93XX_DMA_I2S1, - }, - [SNDRV_PCM_STREAM_CAPTURE] = { - .name = "i2s-pcm-in", - .dma_port = EP93XX_DMA_I2S1, - }, -}; - -static inline void ep93xx_i2s_write_reg(struct ep93xx_i2s_info *info, - unsigned reg, unsigned val) -{ - __raw_writel(val, info->regs + reg); -} - -static inline unsigned ep93xx_i2s_read_reg(struct ep93xx_i2s_info *info, - unsigned reg) -{ - return __raw_readl(info->regs + reg); -} - -static void ep93xx_i2s_enable(struct ep93xx_i2s_info *info, int stream) -{ - unsigned base_reg; - int i; - - if ((ep93xx_i2s_read_reg(info, EP93XX_I2S_TX0EN) & 0x1) == 0 && - (ep93xx_i2s_read_reg(info, EP93XX_I2S_RX0EN) & 0x1) == 0) { - /* Enable clocks */ - clk_enable(info->mclk); - clk_enable(info->sclk); - clk_enable(info->lrclk); - - /* Enable i2s */ - ep93xx_i2s_write_reg(info, EP93XX_I2S_GLCTRL, 1); - } - - /* Enable fifos */ - if (stream == SNDRV_PCM_STREAM_PLAYBACK) - base_reg = EP93XX_I2S_TX0EN; - else - base_reg = EP93XX_I2S_RX0EN; - for (i = 0; i < 3; i++) - ep93xx_i2s_write_reg(info, base_reg + (i * 4), 1); -} - -static void ep93xx_i2s_disable(struct ep93xx_i2s_info *info, int stream) -{ - unsigned base_reg; - int i; - - /* Disable fifos */ - if (stream == SNDRV_PCM_STREAM_PLAYBACK) - base_reg = EP93XX_I2S_TX0EN; - else - base_reg = EP93XX_I2S_RX0EN; - for (i = 0; i < 3; i++) - ep93xx_i2s_write_reg(info, base_reg + (i * 4), 0); - - if ((ep93xx_i2s_read_reg(info, EP93XX_I2S_TX0EN) & 0x1) == 0 && - (ep93xx_i2s_read_reg(info, EP93XX_I2S_RX0EN) & 0x1) == 0) { - /* Disable i2s */ - ep93xx_i2s_write_reg(info, EP93XX_I2S_GLCTRL, 0); - - /* Disable clocks */ - clk_disable(info->lrclk); - clk_disable(info->sclk); - clk_disable(info->mclk); - } -} - -static int ep93xx_i2s_startup(struct snd_pcm_substream *substream, - struct snd_soc_dai *dai) -{ - struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai); - struct snd_soc_dai *cpu_dai = rtd->cpu_dai; - - snd_soc_dai_set_dma_data(cpu_dai, substream, - &info->dma_params[substream->stream]); - return 0; -} - -static void ep93xx_i2s_shutdown(struct snd_pcm_substream *substream, - struct snd_soc_dai *dai) -{ - struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai); - - ep93xx_i2s_disable(info, substream->stream); -} - -static int ep93xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai, - unsigned int fmt) -{ - struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(cpu_dai); - unsigned int clk_cfg, lin_ctrl; - - clk_cfg = ep93xx_i2s_read_reg(info, EP93XX_I2S_RXCLKCFG); - lin_ctrl = ep93xx_i2s_read_reg(info, EP93XX_I2S_RXLINCTRLDATA); - - switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { - case SND_SOC_DAIFMT_I2S: - clk_cfg |= EP93XX_I2S_CLKCFG_REL; - lin_ctrl &= ~EP93XX_I2S_LINCTRLDATA_R_JUST; - break; - - case SND_SOC_DAIFMT_LEFT_J: - clk_cfg &= ~EP93XX_I2S_CLKCFG_REL; - lin_ctrl &= ~EP93XX_I2S_LINCTRLDATA_R_JUST; - break; - - case SND_SOC_DAIFMT_RIGHT_J: - clk_cfg &= ~EP93XX_I2S_CLKCFG_REL; - lin_ctrl |= EP93XX_I2S_LINCTRLDATA_R_JUST; - break; - - default: - return -EINVAL; - } - - switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { - case SND_SOC_DAIFMT_CBS_CFS: - /* CPU is master */ - clk_cfg |= EP93XX_I2S_CLKCFG_MASTER; - break; - - case SND_SOC_DAIFMT_CBM_CFM: - /* Codec is master */ - clk_cfg &= ~EP93XX_I2S_CLKCFG_MASTER; - break; - - default: - return -EINVAL; - } - - switch (fmt & SND_SOC_DAIFMT_INV_MASK) { - case SND_SOC_DAIFMT_NB_NF: - /* Negative bit clock, lrclk low on left word */ - clk_cfg &= ~(EP93XX_I2S_CLKCFG_CKP | EP93XX_I2S_CLKCFG_REL); - break; - - case SND_SOC_DAIFMT_NB_IF: - /* Negative bit clock, lrclk low on right word */ - clk_cfg &= ~EP93XX_I2S_CLKCFG_CKP; - clk_cfg |= EP93XX_I2S_CLKCFG_REL; - break; - - case SND_SOC_DAIFMT_IB_NF: - /* Positive bit clock, lrclk low on left word */ - clk_cfg |= EP93XX_I2S_CLKCFG_CKP; - clk_cfg &= ~EP93XX_I2S_CLKCFG_REL; - break; - - case SND_SOC_DAIFMT_IB_IF: - /* Positive bit clock, lrclk low on right word */ - clk_cfg |= EP93XX_I2S_CLKCFG_CKP | EP93XX_I2S_CLKCFG_REL; - break; - } - - /* Write new register values */ - ep93xx_i2s_write_reg(info, EP93XX_I2S_RXCLKCFG, clk_cfg); - ep93xx_i2s_write_reg(info, EP93XX_I2S_TXCLKCFG, clk_cfg); - ep93xx_i2s_write_reg(info, EP93XX_I2S_RXLINCTRLDATA, lin_ctrl); - ep93xx_i2s_write_reg(info, EP93XX_I2S_TXLINCTRLDATA, lin_ctrl); - return 0; -} - -static int ep93xx_i2s_hw_params(struct snd_pcm_substream *substream, - struct snd_pcm_hw_params *params, - struct snd_soc_dai *dai) -{ - struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai); - unsigned word_len, div, sdiv, lrdiv; - int err; - - switch (params_format(params)) { - case SNDRV_PCM_FORMAT_S16_LE: - word_len = EP93XX_I2S_WRDLEN_16; - break; - - case SNDRV_PCM_FORMAT_S24_LE: - word_len = EP93XX_I2S_WRDLEN_24; - break; - - case SNDRV_PCM_FORMAT_S32_LE: - word_len = EP93XX_I2S_WRDLEN_32; - break; - - default: - return -EINVAL; - } - - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) - ep93xx_i2s_write_reg(info, EP93XX_I2S_TXWRDLEN, word_len); - else - ep93xx_i2s_write_reg(info, EP93XX_I2S_RXWRDLEN, word_len); - - /* - * EP93xx I2S module can be setup so SCLK / LRCLK value can be - * 32, 64, 128. MCLK / SCLK value can be 2 and 4. - * We set LRCLK equal to `rate' and minimum SCLK / LRCLK - * value is 64, because our sample size is 32 bit * 2 channels. - * I2S standard permits us to transmit more bits than - * the codec uses. - */ - div = clk_get_rate(info->mclk) / params_rate(params); - sdiv = 4; - if (div > (256 + 512) / 2) { - lrdiv = 128; - } else { - lrdiv = 64; - if (div < (128 + 256) / 2) - sdiv = 2; - } - - err = clk_set_rate(info->sclk, clk_get_rate(info->mclk) / sdiv); - if (err) - return err; - - err = clk_set_rate(info->lrclk, clk_get_rate(info->sclk) / lrdiv); - if (err) - return err; - - ep93xx_i2s_enable(info, substream->stream); - return 0; -} - -static int ep93xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id, - unsigned int freq, int dir) -{ - struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(cpu_dai); - - if (dir == SND_SOC_CLOCK_IN || clk_id != 0) - return -EINVAL; - - return clk_set_rate(info->mclk, freq); -} - -#ifdef CONFIG_PM -static int ep93xx_i2s_suspend(struct snd_soc_dai *dai) -{ - struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai); - - if (!dai->active) - return 0; - - ep93xx_i2s_disable(info, SNDRV_PCM_STREAM_PLAYBACK); - ep93xx_i2s_disable(info, SNDRV_PCM_STREAM_CAPTURE); - - return 0; -} - -static int ep93xx_i2s_resume(struct snd_soc_dai *dai) -{ - struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai); - - if (!dai->active) - return 0; - - ep93xx_i2s_enable(info, SNDRV_PCM_STREAM_PLAYBACK); - ep93xx_i2s_enable(info, SNDRV_PCM_STREAM_CAPTURE); - - return 0; -} -#else -#define ep93xx_i2s_suspend NULL -#define ep93xx_i2s_resume NULL -#endif - -static const struct snd_soc_dai_ops ep93xx_i2s_dai_ops = { - .startup = ep93xx_i2s_startup, - .shutdown = ep93xx_i2s_shutdown, - .hw_params = ep93xx_i2s_hw_params, - .set_sysclk = ep93xx_i2s_set_sysclk, - .set_fmt = ep93xx_i2s_set_dai_fmt, -}; - -#define EP93XX_I2S_FORMATS (SNDRV_PCM_FMTBIT_S32_LE) - -static struct snd_soc_dai_driver ep93xx_i2s_dai = { - .symmetric_rates= 1, - .suspend = ep93xx_i2s_suspend, - .resume = ep93xx_i2s_resume, - .playback = { - .channels_min = 2, - .channels_max = 2, - .rates = SNDRV_PCM_RATE_8000_192000, - .formats = EP93XX_I2S_FORMATS, - }, - .capture = { - .channels_min = 2, - .channels_max = 2, - .rates = SNDRV_PCM_RATE_8000_192000, - .formats = EP93XX_I2S_FORMATS, - }, - .ops = &ep93xx_i2s_dai_ops, -}; - -static int ep93xx_i2s_probe(struct platform_device *pdev) -{ - struct ep93xx_i2s_info *info; - struct resource *res; - int err; - - info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); - if (!info) - return -ENOMEM; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) - return -ENODEV; - - info->regs = devm_request_and_ioremap(&pdev->dev, res); - if (!info->regs) - return -ENXIO; - - info->mclk = clk_get(&pdev->dev, "mclk"); - if (IS_ERR(info->mclk)) { - err = PTR_ERR(info->mclk); - goto fail; - } - - info->sclk = clk_get(&pdev->dev, "sclk"); - if (IS_ERR(info->sclk)) { - err = PTR_ERR(info->sclk); - goto fail_put_mclk; - } - - info->lrclk = clk_get(&pdev->dev, "lrclk"); - if (IS_ERR(info->lrclk)) { - err = PTR_ERR(info->lrclk); - goto fail_put_sclk; - } - - dev_set_drvdata(&pdev->dev, info); - info->dma_params = ep93xx_i2s_dma_params; - - err = snd_soc_register_dai(&pdev->dev, &ep93xx_i2s_dai); - if (err) - goto fail_put_lrclk; - - return 0; - -fail_put_lrclk: - dev_set_drvdata(&pdev->dev, NULL); - clk_put(info->lrclk); -fail_put_sclk: - clk_put(info->sclk); -fail_put_mclk: - clk_put(info->mclk); -fail: - return err; -} - -static int __devexit ep93xx_i2s_remove(struct platform_device *pdev) -{ - struct ep93xx_i2s_info *info = dev_get_drvdata(&pdev->dev); - - snd_soc_unregister_dai(&pdev->dev); - dev_set_drvdata(&pdev->dev, NULL); - clk_put(info->lrclk); - clk_put(info->sclk); - clk_put(info->mclk); - return 0; -} - -static struct platform_driver ep93xx_i2s_driver = { - .probe = ep93xx_i2s_probe, - .remove = __devexit_p(ep93xx_i2s_remove), - .driver = { - .name = "ep93xx-i2s", - .owner = THIS_MODULE, - }, -}; - -module_platform_driver(ep93xx_i2s_driver); - -MODULE_ALIAS("platform:ep93xx-i2s"); -MODULE_AUTHOR("Ryan Mallon"); -MODULE_DESCRIPTION("EP93XX I2S driver"); -MODULE_LICENSE("GPL"); |