diff options
Diffstat (limited to 'sound/soc/ep93xx/ep93xx-i2s.c')
| -rw-r--r-- | sound/soc/ep93xx/ep93xx-i2s.c | 487 |
1 files changed, 487 insertions, 0 deletions
diff --git a/sound/soc/ep93xx/ep93xx-i2s.c b/sound/soc/ep93xx/ep93xx-i2s.c new file mode 100644 index 00000000000..00b94663218 --- /dev/null +++ b/sound/soc/ep93xx/ep93xx-i2s.c @@ -0,0 +1,487 @@ +/* + * linux/sound/soc/ep93xx-i2s.c + * EP93xx I2S driver + * + * Copyright (C) 2010 Ryan Mallon <ryan@bluewatersys.com> + * + * 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" +#include "ep93xx-i2s.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; + struct resource *mem; + void __iomem *regs; +}; + +struct ep93xx_pcm_dma_params ep93xx_i2s_dma_params[] = { + [SNDRV_PCM_STREAM_PLAYBACK] = { + .name = "i2s-pcm-out", + .dma_port = EP93XX_DMA_M2P_PORT_I2S1, + }, + [SNDRV_PCM_STREAM_CAPTURE] = { + .name = "i2s-pcm-in", + .dma_port = EP93XX_DMA_M2P_PORT_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 snd_soc_dai *cpu_dai = rtd->dai->cpu_dai; + struct ep93xx_i2s_info *info = rtd->dai->cpu_dai->private_data; + + 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 snd_soc_pcm_runtime *rtd = substream->private_data; + struct ep93xx_i2s_info *info = rtd->dai->cpu_dai->private_data; + + 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 = cpu_dai->private_data; + 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 snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai; + struct ep93xx_i2s_info *info = cpu_dai->private_data; + unsigned word_len, div, sdiv, lrdiv; + int found = 0, 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); + + /* + * Calculate the sdiv (bit clock) and lrdiv (left/right clock) values. + * If the lrclk is pulse length is larger than the word size, then the + * bit clock will be gated for the unused bits. + */ + div = (clk_get_rate(info->mclk) / params_rate(params)) * + params_channels(params); + for (sdiv = 2; sdiv <= 4; sdiv += 2) + for (lrdiv = 32; lrdiv <= 128; lrdiv <<= 1) + if (sdiv * lrdiv == div) { + found = 1; + goto out; + } +out: + if (!found) + return -EINVAL; + + 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 = cpu_dai->private_data; + + 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 = dai->private_data; + + if (!dai->active) + return; + + ep93xx_i2s_disable(info, SNDRV_PCM_STREAM_PLAYBACK); + ep93xx_i2s_disable(info, SNDRV_PCM_STREAM_CAPTURE); +} + +static int ep93xx_i2s_resume(struct snd_soc_dai *dai) +{ + struct ep93xx_i2s_info *info = dai->private_data; + + if (!dai->active) + return; + + ep93xx_i2s_enable(info, SNDRV_PCM_STREAM_PLAYBACK); + ep93xx_i2s_enable(info, SNDRV_PCM_STREAM_CAPTURE); +} +#else +#define ep93xx_i2s_suspend NULL +#define ep93xx_i2s_resume NULL +#endif + +static 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_S16_LE | \ + SNDRV_PCM_FMTBIT_S24_LE | \ + SNDRV_PCM_FMTBIT_S32_LE) + +struct snd_soc_dai ep93xx_i2s_dai = { + .name = "ep93xx-i2s", + .id = 0, + .symmetric_rates= 1, + .suspend = ep93xx_i2s_suspend, + .resume = ep93xx_i2s_resume, + .playback = { + .channels_min = 2, + .channels_max = 2, + .rates = SNDRV_PCM_RATE_8000_48000, + .formats = EP93XX_I2S_FORMATS, + }, + .capture = { + .channels_min = 2, + .channels_max = 2, + .rates = SNDRV_PCM_RATE_8000_48000, + .formats = EP93XX_I2S_FORMATS, + }, + .ops = &ep93xx_i2s_dai_ops, +}; +EXPORT_SYMBOL_GPL(ep93xx_i2s_dai); + +static int ep93xx_i2s_probe(struct platform_device *pdev) +{ + struct ep93xx_i2s_info *info; + struct resource *res; + int err; + + info = kzalloc(sizeof(struct ep93xx_i2s_info), GFP_KERNEL); + if (!info) { + err = -ENOMEM; + goto fail; + } + + ep93xx_i2s_dai.dev = &pdev->dev; + ep93xx_i2s_dai.private_data = info; + info->dma_params = ep93xx_i2s_dma_params; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + err = -ENODEV; + goto fail; + } + + info->mem = request_mem_region(res->start, resource_size(res), + pdev->name); + if (!info->mem) { + err = -EBUSY; + goto fail; + } + + info->regs = ioremap(info->mem->start, resource_size(info->mem)); + if (!info->regs) { + err = -ENXIO; + goto fail_release_mem; + } + + info->mclk = clk_get(&pdev->dev, "mclk"); + if (IS_ERR(info->mclk)) { + err = PTR_ERR(info->mclk); + goto fail_unmap_mem; + } + + 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; + } + + err = snd_soc_register_dai(&ep93xx_i2s_dai); + if (err) + goto fail_put_lrclk; + + return 0; + +fail_put_lrclk: + clk_put(info->lrclk); +fail_put_sclk: + clk_put(info->sclk); +fail_put_mclk: + clk_put(info->mclk); +fail_unmap_mem: + iounmap(info->regs); +fail_release_mem: + release_mem_region(info->mem->start, resource_size(info->mem)); + kfree(info); +fail: + return err; +} + +static int __devexit ep93xx_i2s_remove(struct platform_device *pdev) +{ + struct ep93xx_i2s_info *info = ep93xx_i2s_dai.private_data; + + snd_soc_unregister_dai(&ep93xx_i2s_dai); + clk_put(info->lrclk); + clk_put(info->sclk); + clk_put(info->mclk); + iounmap(info->regs); + release_mem_region(info->mem->start, resource_size(info->mem)); + kfree(info); + 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, + }, +}; + +static int __init ep93xx_i2s_init(void) +{ + return platform_driver_register(&ep93xx_i2s_driver); +} + +static void __exit ep93xx_i2s_exit(void) +{ + platform_driver_unregister(&ep93xx_i2s_driver); +} + +module_init(ep93xx_i2s_init); +module_exit(ep93xx_i2s_exit); + +MODULE_ALIAS("platform:ep93xx-i2s"); +MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com>"); +MODULE_DESCRIPTION("EP93XX I2S driver"); +MODULE_LICENSE("GPL"); |