/* * Au12x0/Au1550 PSC ALSA ASoC audio support. * * (c) 2007-2008 MSC Vertriebsges.m.b.H., * Manuel Lauss * * 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: all of these drivers can only work with a SINGLE instance * of a PSC. Multiple independent audio devices are impossible * with ASoC v1. * NOTE: so far only PSC slave mode (bit- and frameclock) is supported. */ #include #include #include #include #include #include #include #include #include #include #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) /* instance data. There can be only one, MacLeod!!!! */ static struct au1xpsc_audio_data *au1xpsc_i2s_workdata; static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) { struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata; 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 = au1xpsc_i2s_workdata; 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 = au1xpsc_i2s_workdata; 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 int au1xpsc_i2s_probe(struct platform_device *pdev, struct snd_soc_dai *dai) { return au1xpsc_i2s_workdata ? 0 : -ENODEV; } static void au1xpsc_i2s_remove(struct platform_device *pdev, struct snd_soc_dai *dai) { } 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, }; struct snd_soc_dai au1xpsc_i2s_dai = { .name = "au1xpsc_i2s", .probe = au1xpsc_i2s_probe, .remove = au1xpsc_i2s_remove, .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, }; EXPORT_SYMBOL(au1xpsc_i2s_dai); static int __devinit au1xpsc_i2s_drvprobe(struct platform_device *pdev) { struct resource *r; unsigned long sel; int ret; struct au1xpsc_audio_data *wd; if (au1xpsc_i2s_workdata) return -EBUSY; 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; wd->ioarea = request_mem_region(r->start, r->end - r->start + 1, "au1xpsc_i2s"); if (!wd->ioarea) goto out0; wd->mmio = ioremap(r->start, 0xffff); 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. */ ret = snd_soc_register_dai(&au1xpsc_i2s_dai); if (ret) goto out1; /* finally add the DMA device for this PSC */ wd->dmapd = au1xpsc_pcm_add(pdev); if (wd->dmapd) { platform_set_drvdata(pdev, wd); au1xpsc_i2s_workdata = wd; return 0; } snd_soc_unregister_dai(&au1xpsc_i2s_dai); out1: release_resource(wd->ioarea); kfree(wd->ioarea); out0: kfree(wd); return ret; } static int __devexit au1xpsc_i2s_drvremove(struct platform_device *pdev) { struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev); if (wd->dmapd) au1xpsc_pcm_destroy(wd->dmapd); snd_soc_unregister_dai(&au1xpsc_i2s_dai); au_writel(0, I2S_CFG(wd)); au_sync(); au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); au_sync(); iounmap(wd->mmio); release_resource(wd->ioarea); kfree(wd->ioarea); kfree(wd); au1xpsc_i2s_workdata = NULL; /* MDEV */ 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) { au1xpsc_i2s_workdata = NULL; 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");