diff options
Diffstat (limited to 'sound/soc/codecs/mxs_spdif.c')
| -rw-r--r-- | sound/soc/codecs/mxs_spdif.c | 447 |
1 files changed, 447 insertions, 0 deletions
diff --git a/sound/soc/codecs/mxs_spdif.c b/sound/soc/codecs/mxs_spdif.c new file mode 100644 index 000000000000..cdd8c343da71 --- /dev/null +++ b/sound/soc/codecs/mxs_spdif.c @@ -0,0 +1,447 @@ +/* + * ALSA SoC MXS SPDIF codec driver + * + * Copyright (C) 2008-2010 Freescale Semiconductor, Inc. + * + * Based on stmp3xxx_spdif.h by: + * Vladimir Barinov <vbarinov@embeddedalley.com> + * + * Copyright 2008 SigmaTel, Inc + * Copyright 2008 Embedded Alley Solutions, Inc + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + */ +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/pm.h> +#include <linux/clk.h> +#include <linux/platform_device.h> +#include <linux/dma-mapping.h> +#include <linux/interrupt.h> +#include <linux/slab.h> + +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> +#include <sound/soc-dapm.h> +#include <sound/initval.h> +#include <asm/dma.h> +#include <mach/hardware.h> + +#include "mxs_spdif.h" + +#define REGS_SPDIF_BASE IO_ADDRESS(SPDIF_PHYS_ADDR) + +#define BF(value, field) (((value) << BP_##field) & BM_##field) + +struct mxs_codec_priv { + struct clk *clk; + struct snd_soc_codec codec; +}; + +/* + * ALSA API + */ +static void __iomem *spdif_regmap[] = { + REGS_SPDIF_BASE + HW_SPDIF_CTRL, + REGS_SPDIF_BASE + HW_SPDIF_STAT, + REGS_SPDIF_BASE + HW_SPDIF_FRAMECTRL, + REGS_SPDIF_BASE + HW_SPDIF_SRR, + REGS_SPDIF_BASE + HW_SPDIF_DEBUG, + REGS_SPDIF_BASE + HW_SPDIF_DATA, + REGS_SPDIF_BASE + HW_SPDIF_VERSION, +}; + +/* + * ALSA core supports only 16 bit registers. It means we have to simulate it + * by virtually splitting a 32bit SPDIF registers into two halves + * high (bits 31:16) and low (bits 15:0). The routins abow detects which part + * of 32bit register is accessed. + */ +static int mxs_codec_write(struct snd_soc_codec *codec, + unsigned int reg, unsigned int value) +{ + unsigned int reg_val; + unsigned int mask = 0xffff; + + if (reg >= SPDIF_REGNUM) + return -EIO; + + if (reg & 0x1) { + mask <<= 16; + value <<= 16; + } + + reg_val = __raw_readl(spdif_regmap[reg >> 1]); + reg_val = (reg_val & ~mask) | value; + __raw_writel(reg_val, spdif_regmap[reg >> 1]); + + return 0; +} + +static unsigned int mxs_codec_read(struct snd_soc_codec *codec, + unsigned int reg) +{ + unsigned int reg_val; + + if (reg >= SPDIF_REGNUM) + return -1; + + reg_val = __raw_readl(spdif_regmap[reg >> 1]); + if (reg & 1) + reg_val >>= 16; + + return reg_val & 0xffff; +} + +/* Codec controls */ +static const struct snd_kcontrol_new mxs_snd_controls[] = { + SOC_SINGLE("PRO", SPDIF_FRAMECTRL_L, 0, 0x1, 0), + SOC_SINGLE("AUDIO", SPDIF_FRAMECTRL_L, 1, 0x1, 0), + SOC_SINGLE("COPY", SPDIF_FRAMECTRL_L, 2, 0x1, 0), + SOC_SINGLE("PRE", SPDIF_FRAMECTRL_L, 3, 0x1, 0), + SOC_SINGLE("CC", SPDIF_FRAMECTRL_L, 4, 0x7F, 0), + SOC_SINGLE("L", SPDIF_FRAMECTRL_L, 12, 0x1, 0), + SOC_SINGLE("V", SPDIF_FRAMECTRL_L, 13, 0x1, 0), + SOC_SINGLE("USER DATA", SPDIF_FRAMECTRL_L, 14, 0x1, 0), + SOC_SINGLE("AUTO MUTE", SPDIF_FRAMECTRL_H, 16, 0x1, 0), + SOC_SINGLE("V CONFIG", SPDIF_FRAMECTRL_H, 17, 0x1, 0), +}; + +struct spdif_srr { + u32 rate; + u32 basemult; + u32 rate_factor; +}; + +static struct spdif_srr srr_values[] = { + {96000, 0x2, 0x0BB80}, + {88200, 0x2, 0x0AC44}, + {64000, 0x2, 0x07D00}, + {48000, 0x1, 0x0BB80}, + {44100, 0x1, 0x0AC44}, + {32000, 0x1, 0x07D00}, +}; + +static inline int get_srr_values(int rate) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(srr_values); i++) + if (srr_values[i].rate == rate) + return i; + + return -1; +} + +static int mxs_codec_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_device *socdev = rtd->socdev; + struct snd_soc_codec *codec = socdev->card->codec; + int playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0; + int i; + u32 srr_value = 0; + u32 basemult; + + i = get_srr_values(params_rate(params)); + if (i < 0) + printk(KERN_WARNING "%s doesn't support rate %d\n", + codec->name, params_rate(params)); + else { + basemult = srr_values[i].basemult; + + srr_value = BF(basemult, SPDIF_SRR_BASEMULT) | + BF(srr_values[i].rate_factor, SPDIF_SRR_RATE); + + if (playback) + __raw_writel(srr_value, REGS_SPDIF_BASE + HW_SPDIF_SRR); + } + + switch (params_format(params)) { + case SNDRV_PCM_FORMAT_S16_LE: + if (playback) + __raw_writel(BM_SPDIF_CTRL_WORD_LENGTH, + REGS_SPDIF_BASE + HW_SPDIF_CTRL_SET); + break; + case SNDRV_PCM_FORMAT_S20_3LE: + case SNDRV_PCM_FORMAT_S24_LE: + case SNDRV_PCM_FORMAT_S32_LE: + if (playback) + __raw_writel(BM_SPDIF_CTRL_WORD_LENGTH, + REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR); + break; + default: + printk(KERN_WARNING "%s doesn't support format %d\n", + codec->name, params_format(params)); + } + + return 0; +} + +static void mxs_codec_spdif_enable(struct mxs_codec_priv *mxs_spdif) +{ + /* Move SPDIF codec out of reset */ + __raw_writel(BM_SPDIF_CTRL_SFTRST, REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR); + + /* Ungate SPDIF clocks */ + __raw_writel(BM_SPDIF_CTRL_CLKGATE, + REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR); + + /* 16 bit word length */ + __raw_writel(BM_SPDIF_CTRL_WORD_LENGTH, + REGS_SPDIF_BASE + HW_SPDIF_CTRL_SET); +} + +static void mxs_codec_spdif_disable(struct mxs_codec_priv *mxs_spdif) +{ + /* Gate SPDIF clocks */ + __raw_writel(BM_SPDIF_CTRL_CLKGATE, + REGS_SPDIF_BASE + HW_SPDIF_CTRL_SET); +} + +static void mxs_codec_init(struct snd_soc_codec *codec) +{ + struct mxs_codec_priv *mxs_spdif = codec->drvdata; + + /* Soft reset SPDIF block */ + __raw_writel(BM_SPDIF_CTRL_SFTRST, REGS_SPDIF_BASE + HW_SPDIF_CTRL_SET); + + while (!(__raw_readl(REGS_SPDIF_BASE + HW_SPDIF_CTRL) + & BM_SPDIF_CTRL_CLKGATE)) + ; + + mxs_codec_spdif_enable(mxs_spdif); + + snd_soc_add_controls(codec, mxs_snd_controls, + ARRAY_SIZE(mxs_snd_controls)); +} + +static void mxs_codec_exit(struct snd_soc_codec *codec) +{ + struct mxs_codec_priv *mxs_spdif = codec->drvdata; + + mxs_codec_spdif_disable(mxs_spdif); +} + +struct snd_soc_dai_ops mxs_spdif_codec_dai_ops = { + .hw_params = mxs_codec_hw_params, +}; + +struct snd_soc_dai mxs_spdif_codec_dai = { + .name = "mxs spdif", + .playback = { + .stream_name = "Playback", + .channels_min = 2, + .channels_max = 2, + .rates = MXS_SPDIF_RATES, + .formats = MXS_SPDIF_FORMATS, + }, + .ops = &mxs_spdif_codec_dai_ops, +}; +EXPORT_SYMBOL_GPL(mxs_spdif_codec_dai); + +static struct snd_soc_codec *mxs_spdif_codec; + +static int mxs_codec_probe(struct platform_device *pdev) +{ + struct snd_soc_device *socdev = platform_get_drvdata(pdev); + struct snd_soc_codec *codec; + int ret = 0; + + socdev->card->codec = mxs_spdif_codec; + codec = mxs_spdif_codec; + + /* register pcms */ + ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); + if (ret < 0) { + dev_err(codec->dev, "failed to create pcms\n"); + return ret; + } + + mxs_codec_init(codec); + + return 0; +} + +static int mxs_codec_remove(struct platform_device *pdev) +{ + struct snd_soc_device *socdev = platform_get_drvdata(pdev); + struct snd_soc_codec *codec = socdev->card->codec; + + mxs_codec_exit(codec); + + snd_soc_free_pcms(socdev); + snd_soc_dapm_free(socdev); + + return 0; +} + +#ifdef CONFIG_PM +static int mxs_codec_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct snd_soc_device *socdev = platform_get_drvdata(pdev); + struct snd_soc_codec *codec = socdev->card->codec; + struct mxs_codec_priv *mxs_spdif; + int ret = -EINVAL; + + if (codec == NULL) + goto out; + + mxs_spdif = codec->drvdata; + + mxs_codec_spdif_disable(mxs_spdif); + clk_disable(mxs_spdif->clk); + ret = 0; + +out: + return ret; +} + +static int mxs_codec_resume(struct platform_device *pdev) +{ + struct snd_soc_device *socdev = platform_get_drvdata(pdev); + struct snd_soc_codec *codec = socdev->card->codec; + struct mxs_codec_priv *mxs_spdif; + int ret = -EINVAL; + + if (codec == NULL) + goto out; + + mxs_spdif = codec->drvdata; + clk_enable(mxs_spdif->clk); + + /* Soft reset SPDIF block */ + __raw_writel(BM_SPDIF_CTRL_SFTRST, REGS_SPDIF_BASE + HW_SPDIF_CTRL_SET); + while (!(__raw_readl(REGS_SPDIF_BASE + HW_SPDIF_CTRL) + & BM_SPDIF_CTRL_CLKGATE)) + ; + + mxs_codec_spdif_enable(mxs_spdif); + + ret = 0; + +out: + return ret; +} +#else +#define mxs_codec_suspend NULL +#define mxs_codec_resume NULL +#endif /* CONFIG_PM */ + +struct snd_soc_codec_device soc_spdif_codec_dev_mxs = { + .probe = mxs_codec_probe, + .remove = mxs_codec_remove, + .suspend = mxs_codec_suspend, + .resume = mxs_codec_resume, +}; +EXPORT_SYMBOL_GPL(soc_spdif_codec_dev_mxs); + +static int __init mxs_spdif_probe(struct platform_device *pdev) +{ + struct snd_soc_codec *codec; + struct mxs_codec_priv *mxs_spdif; + int ret = 0; + + dev_info(&pdev->dev, "MXS SPDIF Audio Transmitter\n"); + + mxs_spdif = kzalloc(sizeof(struct mxs_codec_priv), GFP_KERNEL); + if (mxs_spdif == NULL) + return -ENOMEM; + + codec = &mxs_spdif->codec; + codec->name = "mxs spdif"; + codec->owner = THIS_MODULE; + codec->drvdata = mxs_spdif; + codec->read = mxs_codec_read; + codec->write = mxs_codec_write; + codec->dai = &mxs_spdif_codec_dai; + codec->num_dai = 1; + + platform_set_drvdata(pdev, mxs_spdif); + mxs_spdif_codec = codec; + + mutex_init(&codec->mutex); + INIT_LIST_HEAD(&codec->dapm_widgets); + INIT_LIST_HEAD(&codec->dapm_paths); + + /* Turn on audio clock */ + mxs_spdif->clk = clk_get(&pdev->dev, "spdif"); + if (IS_ERR(mxs_spdif->clk)) { + ret = PTR_ERR(mxs_spdif->clk); + dev_err(&pdev->dev, "Clocks initialization failed\n"); + goto clk_err; + } + clk_enable(mxs_spdif->clk); + + ret = snd_soc_register_codec(codec); + if (ret) { + dev_err(&pdev->dev, "failed to register card\n"); + goto card_err; + } + + ret = snd_soc_register_dai(&mxs_spdif_codec_dai); + if (ret) { + dev_err(&pdev->dev, "failed to register card\n"); + goto dai_err; + } + + return 0; + +dai_err: + snd_soc_unregister_codec(codec); +card_err: + clk_disable(mxs_spdif->clk); + clk_put(mxs_spdif->clk); +clk_err: + kfree(mxs_spdif); + return ret; +} + +static int __devexit mxs_spdif_remove(struct platform_device *pdev) +{ + struct mxs_codec_priv *mxs_spdif = platform_get_drvdata(pdev); + struct snd_soc_codec *codec = &mxs_spdif->codec; + + snd_soc_unregister_codec(codec); + + clk_disable(mxs_spdif->clk); + clk_put(mxs_spdif->clk); + + kfree(mxs_spdif); + + return 0; +} + +struct platform_driver mxs_spdif_driver = { + .driver = { + .name = "mxs-spdif", + }, + .probe = mxs_spdif_probe, + .remove = __devexit_p(mxs_spdif_remove), +}; + +static int __init mxs_spdif_init(void) +{ + return platform_driver_register(&mxs_spdif_driver); +} + +static void __exit mxs_spdif_exit(void) +{ + return platform_driver_unregister(&mxs_spdif_driver); +} + +module_init(mxs_spdif_init); +module_exit(mxs_spdif_exit); + +MODULE_DESCRIPTION("MXS SPDIF transmitter"); +MODULE_AUTHOR("Vladimir Barinov"); +MODULE_LICENSE("GPL"); |