diff options
Diffstat (limited to 'sound/soc/au1x/psc-i2s.c')
| -rw-r--r-- | sound/soc/au1x/psc-i2s.c | 440 |
1 files changed, 440 insertions, 0 deletions
diff --git a/sound/soc/au1x/psc-i2s.c b/sound/soc/au1x/psc-i2s.c new file mode 100644 index 00000000..fca09127 --- /dev/null +++ b/sound/soc/au1x/psc-i2s.c @@ -0,0 +1,440 @@ +/* + * Au12x0/Au1550 PSC ALSA ASoC audio support. + * + * (c) 2007-2008 MSC Vertriebsges.m.b.H., + * Manuel Lauss <manuel.lauss@gmail.com> + * + * 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. + * + * Au1xxx-PSC I2S glue. + * + * NOTE: so far only PSC slave mode (bit- and frameclock) is supported. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/suspend.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/initval.h> +#include <sound/soc.h> +#include <asm/mach-au1x00/au1000.h> +#include <asm/mach-au1x00/au1xxx_psc.h> + +#include "psc.h" + +/* supported I2S DAI hardware formats */ +#define AU1XPSC_I2S_DAIFMT \ + (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J | \ + SND_SOC_DAIFMT_NB_NF) + +/* supported I2S direction */ +#define AU1XPSC_I2S_DIR \ + (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE) + +#define AU1XPSC_I2S_RATES \ + SNDRV_PCM_RATE_8000_192000 + +#define AU1XPSC_I2S_FMTS \ + (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE) + +#define I2SSTAT_BUSY(stype) \ + ((stype) == PCM_TX ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB) +#define I2SPCR_START(stype) \ + ((stype) == PCM_TX ? PSC_I2SPCR_TS : PSC_I2SPCR_RS) +#define I2SPCR_STOP(stype) \ + ((stype) == PCM_TX ? PSC_I2SPCR_TP : PSC_I2SPCR_RP) +#define I2SPCR_CLRFIFO(stype) \ + ((stype) == PCM_TX ? PSC_I2SPCR_TC : PSC_I2SPCR_RC) + + +static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, + unsigned int fmt) +{ + struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(cpu_dai); + unsigned long ct; + int ret; + + ret = -EINVAL; + + ct = pscdata->cfg; + + ct &= ~(PSC_I2SCFG_XM | PSC_I2SCFG_MLJ); /* left-justified */ + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_I2S: + ct |= PSC_I2SCFG_XM; /* enable I2S mode */ + break; + case SND_SOC_DAIFMT_MSB: + break; + case SND_SOC_DAIFMT_LSB: + ct |= PSC_I2SCFG_MLJ; /* LSB (right-) justified */ + break; + default: + goto out; + } + + ct &= ~(PSC_I2SCFG_BI | PSC_I2SCFG_WI); /* IB-IF */ + switch (fmt & SND_SOC_DAIFMT_INV_MASK) { + case SND_SOC_DAIFMT_NB_NF: + ct |= PSC_I2SCFG_BI | PSC_I2SCFG_WI; + break; + case SND_SOC_DAIFMT_NB_IF: + ct |= PSC_I2SCFG_BI; + break; + case SND_SOC_DAIFMT_IB_NF: + ct |= PSC_I2SCFG_WI; + break; + case SND_SOC_DAIFMT_IB_IF: + break; + default: + goto out; + } + + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBM_CFM: /* CODEC master */ + ct |= PSC_I2SCFG_MS; /* PSC I2S slave mode */ + break; + case SND_SOC_DAIFMT_CBS_CFS: /* CODEC slave */ + ct &= ~PSC_I2SCFG_MS; /* PSC I2S Master mode */ + break; + default: + goto out; + } + + pscdata->cfg = ct; + ret = 0; +out: + return ret; +} + +static int au1xpsc_i2s_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); + + int cfgbits; + unsigned long stat; + + /* check if the PSC is already streaming data */ + stat = au_readl(I2S_STAT(pscdata)); + if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) { + /* reject parameters not currently set up in hardware */ + cfgbits = au_readl(I2S_CFG(pscdata)); + if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) || + (params_rate(params) != pscdata->rate)) + return -EINVAL; + } else { + /* set sample bitdepth */ + pscdata->cfg &= ~(0x1f << 4); + pscdata->cfg |= PSC_I2SCFG_SET_LEN(params->msbits); + /* remember current rate for other stream */ + pscdata->rate = params_rate(params); + } + return 0; +} + +/* Configure PSC late: on my devel systems the codec is I2S master and + * supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit. ASoC + * uses aggressive PM and switches the codec off when it is not in use + * which also means the PSC unit doesn't get any clocks and is therefore + * dead. That's why this chunk here gets called from the trigger callback + * because I can be reasonably certain the codec is driving the clocks. + */ +static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata) +{ + unsigned long tmo; + + /* bring PSC out of sleep, and configure I2S unit */ + au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata)); + au_sync(); + + tmo = 1000000; + while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo) + tmo--; + + if (!tmo) + goto psc_err; + + au_writel(0, I2S_CFG(pscdata)); + au_sync(); + au_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata)); + au_sync(); + + /* wait for I2S controller to become ready */ + tmo = 1000000; + while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo) + tmo--; + + if (tmo) + return 0; + +psc_err: + au_writel(0, I2S_CFG(pscdata)); + au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata)); + au_sync(); + return -ETIMEDOUT; +} + +static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype) +{ + unsigned long tmo, stat; + int ret; + + ret = 0; + + /* if both TX and RX are idle, configure the PSC */ + stat = au_readl(I2S_STAT(pscdata)); + if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) { + ret = au1xpsc_i2s_configure(pscdata); + if (ret) + goto out; + } + + au_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata)); + au_sync(); + au_writel(I2SPCR_START(stype), I2S_PCR(pscdata)); + au_sync(); + + /* wait for start confirmation */ + tmo = 1000000; + while (!(au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo) + tmo--; + + if (!tmo) { + au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata)); + au_sync(); + ret = -ETIMEDOUT; + } +out: + return ret; +} + +static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype) +{ + unsigned long tmo, stat; + + au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata)); + au_sync(); + + /* wait for stop confirmation */ + tmo = 1000000; + while ((au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo) + tmo--; + + /* if both TX and RX are idle, disable PSC */ + stat = au_readl(I2S_STAT(pscdata)); + if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) { + au_writel(0, I2S_CFG(pscdata)); + au_sync(); + au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata)); + au_sync(); + } + return 0; +} + +static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *dai) +{ + struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); + int ret, stype = SUBSTREAM_TYPE(substream); + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + ret = au1xpsc_i2s_start(pscdata, stype); + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + ret = au1xpsc_i2s_stop(pscdata, stype); + break; + default: + ret = -EINVAL; + } + return ret; +} + +static struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = { + .trigger = au1xpsc_i2s_trigger, + .hw_params = au1xpsc_i2s_hw_params, + .set_fmt = au1xpsc_i2s_set_fmt, +}; + +static const struct snd_soc_dai_driver au1xpsc_i2s_dai_template = { + .playback = { + .rates = AU1XPSC_I2S_RATES, + .formats = AU1XPSC_I2S_FMTS, + .channels_min = 2, + .channels_max = 8, /* 2 without external help */ + }, + .capture = { + .rates = AU1XPSC_I2S_RATES, + .formats = AU1XPSC_I2S_FMTS, + .channels_min = 2, + .channels_max = 8, /* 2 without external help */ + }, + .ops = &au1xpsc_i2s_dai_ops, +}; + +static int __devinit au1xpsc_i2s_drvprobe(struct platform_device *pdev) +{ + struct resource *r; + unsigned long sel; + int ret; + struct au1xpsc_audio_data *wd; + + wd = kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL); + if (!wd) + return -ENOMEM; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!r) { + ret = -ENODEV; + goto out0; + } + + ret = -EBUSY; + if (!request_mem_region(r->start, resource_size(r), pdev->name)) + goto out0; + + wd->mmio = ioremap(r->start, resource_size(r)); + if (!wd->mmio) + goto out1; + + /* preserve PSC clock source set up by platform (dev.platform_data + * is already occupied by soc layer) + */ + sel = au_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK; + au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); + au_sync(); + au_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(wd)); + au_writel(0, I2S_CFG(wd)); + au_sync(); + + /* preconfigure: set max rx/tx fifo depths */ + wd->cfg |= PSC_I2SCFG_RT_FIFO8 | PSC_I2SCFG_TT_FIFO8; + + /* don't wait for I2S core to become ready now; clocks may not + * be running yet; depending on clock input for PSC a wait might + * time out. + */ + + /* name the DAI like this device instance ("au1xpsc-i2s.PSCINDEX") */ + memcpy(&wd->dai_drv, &au1xpsc_i2s_dai_template, + sizeof(struct snd_soc_dai_driver)); + wd->dai_drv.name = dev_name(&pdev->dev); + + platform_set_drvdata(pdev, wd); + + ret = snd_soc_register_dai(&pdev->dev, &wd->dai_drv); + if (ret) + goto out1; + + /* finally add the DMA device for this PSC */ + wd->dmapd = au1xpsc_pcm_add(pdev); + if (wd->dmapd) + return 0; + + snd_soc_unregister_dai(&pdev->dev); +out1: + release_mem_region(r->start, resource_size(r)); +out0: + kfree(wd); + return ret; +} + +static int __devexit au1xpsc_i2s_drvremove(struct platform_device *pdev) +{ + struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev); + struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + if (wd->dmapd) + au1xpsc_pcm_destroy(wd->dmapd); + + snd_soc_unregister_dai(&pdev->dev); + + au_writel(0, I2S_CFG(wd)); + au_sync(); + au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); + au_sync(); + + iounmap(wd->mmio); + release_mem_region(r->start, resource_size(r)); + kfree(wd); + + return 0; +} + +#ifdef CONFIG_PM +static int au1xpsc_i2s_drvsuspend(struct device *dev) +{ + struct au1xpsc_audio_data *wd = dev_get_drvdata(dev); + + /* save interesting register and disable PSC */ + wd->pm[0] = au_readl(PSC_SEL(wd)); + + au_writel(0, I2S_CFG(wd)); + au_sync(); + au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); + au_sync(); + + return 0; +} + +static int au1xpsc_i2s_drvresume(struct device *dev) +{ + struct au1xpsc_audio_data *wd = dev_get_drvdata(dev); + + /* select I2S mode and PSC clock */ + au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); + au_sync(); + au_writel(0, PSC_SEL(wd)); + au_sync(); + au_writel(wd->pm[0], PSC_SEL(wd)); + au_sync(); + + return 0; +} + +static struct dev_pm_ops au1xpsci2s_pmops = { + .suspend = au1xpsc_i2s_drvsuspend, + .resume = au1xpsc_i2s_drvresume, +}; + +#define AU1XPSCI2S_PMOPS &au1xpsci2s_pmops + +#else + +#define AU1XPSCI2S_PMOPS NULL + +#endif + +static struct platform_driver au1xpsc_i2s_driver = { + .driver = { + .name = "au1xpsc_i2s", + .owner = THIS_MODULE, + .pm = AU1XPSCI2S_PMOPS, + }, + .probe = au1xpsc_i2s_drvprobe, + .remove = __devexit_p(au1xpsc_i2s_drvremove), +}; + +static int __init au1xpsc_i2s_load(void) +{ + return platform_driver_register(&au1xpsc_i2s_driver); +} + +static void __exit au1xpsc_i2s_unload(void) +{ + platform_driver_unregister(&au1xpsc_i2s_driver); +} + +module_init(au1xpsc_i2s_load); +module_exit(au1xpsc_i2s_unload); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver"); +MODULE_AUTHOR("Manuel Lauss"); |