// SPDX-License-Identifier: GPL-2.0-only /* * Au12x0/Au1550 PSC ALSA ASoC audio support. * * (c) 2007-2009 MSC Vertriebsges.m.b.H., * Manuel Lauss * * Au1xxx-PSC AC97 glue. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "psc.h" /* how often to retry failed codec register reads/writes */ #define AC97_RW_RETRIES 5 #define AC97_DIR \ (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE) #define AC97_RATES \ SNDRV_PCM_RATE_8000_48000 #define AC97_FMTS \ (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3BE) #define AC97PCR_START(stype) \ ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TS : PSC_AC97PCR_RS) #define AC97PCR_STOP(stype) \ ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TP : PSC_AC97PCR_RP) #define AC97PCR_CLRFIFO(stype) \ ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TC : PSC_AC97PCR_RC) #define AC97STAT_BUSY(stype) \ ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97STAT_TB : PSC_AC97STAT_RB) /* instance data. There can be only one, MacLeod!!!! */ static struct au1xpsc_audio_data *au1xpsc_ac97_workdata; #if 0 /* this could theoretically work, but ac97->bus->card->private_data can be NULL * when snd_ac97_mixer() is called; I don't know if the rest further down the * chain are always valid either. */ static inline struct au1xpsc_audio_data *ac97_to_pscdata(struct snd_ac97 *x) { struct snd_soc_card *c = x->bus->card->private_data; return snd_soc_dai_get_drvdata(c->snd_soc_rtd_to_cpu(rtd, 0)); } #else #define ac97_to_pscdata(x) au1xpsc_ac97_workdata #endif /* AC97 controller reads codec register */ static unsigned short au1xpsc_ac97_read(struct snd_ac97 *ac97, unsigned short reg) { struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97); unsigned short retry, tmo; unsigned long data; __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata)); wmb(); /* drain writebuffer */ retry = AC97_RW_RETRIES; do { mutex_lock(&pscdata->lock); __raw_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg), AC97_CDC(pscdata)); wmb(); /* drain writebuffer */ tmo = 20; do { udelay(21); if (__raw_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD) break; } while (--tmo); data = __raw_readl(AC97_CDC(pscdata)); __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata)); wmb(); /* drain writebuffer */ mutex_unlock(&pscdata->lock); if (reg != ((data >> 16) & 0x7f)) tmo = 1; /* wrong register, try again */ } while (--retry && !tmo); return retry ? data & 0xffff : 0xffff; } /* AC97 controller writes to codec register */ static void au1xpsc_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val) { struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97); unsigned int tmo, retry; __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata)); wmb(); /* drain writebuffer */ retry = AC97_RW_RETRIES; do { mutex_lock(&pscdata->lock); __raw_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff), AC97_CDC(pscdata)); wmb(); /* drain writebuffer */ tmo = 20; do { udelay(21); if (__raw_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD) break; } while (--tmo); __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata)); wmb(); /* drain writebuffer */ mutex_unlock(&pscdata->lock); } while (--retry && !tmo); } /* AC97 controller asserts a warm reset */ static void au1xpsc_ac97_warm_reset(struct snd_ac97 *ac97) { struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97); __raw_writel(PSC_AC97RST_SNC, AC97_RST(pscdata)); wmb(); /* drain writebuffer */ msleep(10); __raw_writel(0, AC97_RST(pscdata)); wmb(); /* drain writebuffer */ } static void au1xpsc_ac97_cold_reset(struct snd_ac97 *ac97) { struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97); int i; /* disable PSC during cold reset */ __raw_writel(0, AC97_CFG(au1xpsc_ac97_workdata)); wmb(); /* drain writebuffer */ __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(pscdata)); wmb(); /* drain writebuffer */ /* issue cold reset */ __raw_writel(PSC_AC97RST_RST, AC97_RST(pscdata)); wmb(); /* drain writebuffer */ msleep(500); __raw_writel(0, AC97_RST(pscdata)); wmb(); /* drain writebuffer */ /* enable PSC */ __raw_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata)); wmb(); /* drain writebuffer */ /* wait for PSC to indicate it's ready */ i = 1000; while (!((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_SR)) && (--i)) msleep(1); if (i == 0) { printk(KERN_ERR "au1xpsc-ac97: PSC not ready!\n"); return; } /* enable the ac97 function */ __raw_writel(pscdata->cfg | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata)); wmb(); /* drain writebuffer */ /* wait for AC97 core to become ready */ i = 1000; while (!((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && (--i)) msleep(1); if (i == 0) printk(KERN_ERR "au1xpsc-ac97: AC97 ctrl not ready\n"); } /* AC97 controller operations */ static struct snd_ac97_bus_ops psc_ac97_ops = { .read = au1xpsc_ac97_read, .write = au1xpsc_ac97_write, .reset = au1xpsc_ac97_cold_reset, .warm_reset = au1xpsc_ac97_warm_reset, }; static int au1xpsc_ac97_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); unsigned long r, ro, stat; int chans, t, stype = substream->stream; chans = params_channels(params); r = ro = __raw_readl(AC97_CFG(pscdata)); stat = __raw_readl(AC97_STAT(pscdata)); /* already active? */ if (stat & (PSC_AC97STAT_TB | PSC_AC97STAT_RB)) { /* reject parameters not currently set up */ if ((PSC_AC97CFG_GET_LEN(r) != params->msbits) || (pscdata->rate != params_rate(params))) return -EINVAL; } else { /* set sample bitdepth: REG[24:21]=(BITS-2)/2 */ r &= ~PSC_AC97CFG_LEN_MASK; r |= PSC_AC97CFG_SET_LEN(params->msbits); /* channels: enable slots for front L/R channel */ if (stype == SNDRV_PCM_STREAM_PLAYBACK) { r &= ~PSC_AC97CFG_TXSLOT_MASK; r |= PSC_AC97CFG_TXSLOT_ENA(3); r |= PSC_AC97CFG_TXSLOT_ENA(4); } else { r &= ~PSC_AC97CFG_RXSLOT_MASK; r |= PSC_AC97CFG_RXSLOT_ENA(3); r |= PSC_AC97CFG_RXSLOT_ENA(4); } /* do we need to poke the hardware? */ if (!(r ^ ro)) goto out; /* ac97 engine is about to be disabled */ mutex_lock(&pscdata->lock); /* disable AC97 device controller first... */ __raw_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata)); wmb(); /* drain writebuffer */ /* ...wait for it... */ t = 100; while ((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR) && --t) msleep(1); if (!t) printk(KERN_ERR "PSC-AC97: can't disable!\n"); /* ...write config... */ __raw_writel(r, AC97_CFG(pscdata)); wmb(); /* drain writebuffer */ /* ...enable the AC97 controller again... */ __raw_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata)); wmb(); /* drain writebuffer */ /* ...and wait for ready bit */ t = 100; while ((!(__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && --t) msleep(1); if (!t) printk(KERN_ERR "PSC-AC97: can't enable!\n"); mutex_unlock(&pscdata->lock); pscdata->cfg = r; pscdata->rate = params_rate(params); } out: return 0; } static int au1xpsc_ac97_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->stream; ret = 0; switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: __raw_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata)); wmb(); /* drain writebuffer */ __raw_writel(AC97PCR_START(stype), AC97_PCR(pscdata)); wmb(); /* drain writebuffer */ break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: __raw_writel(AC97PCR_STOP(stype), AC97_PCR(pscdata)); wmb(); /* drain writebuffer */ while (__raw_readl(AC97_STAT(pscdata)) & AC97STAT_BUSY(stype)) asm volatile ("nop"); __raw_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata)); wmb(); /* drain writebuffer */ break; default: ret = -EINVAL; } return ret; } static int au1xpsc_ac97_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]); return 0; } static int au1xpsc_ac97_probe(struct snd_soc_dai *dai) { return au1xpsc_ac97_workdata ? 0 : -ENODEV; } static const struct snd_soc_dai_ops au1xpsc_ac97_dai_ops = { .probe = au1xpsc_ac97_probe, .startup = au1xpsc_ac97_startup, .trigger = au1xpsc_ac97_trigger, .hw_params = au1xpsc_ac97_hw_params, }; static const struct snd_soc_dai_driver au1xpsc_ac97_dai_template = { .playback = { .rates = AC97_RATES, .formats = AC97_FMTS, .channels_min = 2, .channels_max = 2, }, .capture = { .rates = AC97_RATES, .formats = AC97_FMTS, .channels_min = 2, .channels_max = 2, }, .ops = &au1xpsc_ac97_dai_ops, }; static const struct snd_soc_component_driver au1xpsc_ac97_component = { .name = "au1xpsc-ac97", .legacy_dai_naming = 1, }; static int au1xpsc_ac97_drvprobe(struct platform_device *pdev) { int ret; struct resource *dmares; unsigned long sel; struct au1xpsc_audio_data *wd; wd = devm_kzalloc(&pdev->dev, sizeof(struct au1xpsc_audio_data), GFP_KERNEL); if (!wd) return -ENOMEM; mutex_init(&wd->lock); wd->mmio = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(wd->mmio)) return PTR_ERR(wd->mmio); dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0); if (!dmares) return -EBUSY; wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start; dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1); if (!dmares) return -EBUSY; wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start; /* configuration: max dma trigger threshold, enable ac97 */ wd->cfg = PSC_AC97CFG_RT_FIFO8 | PSC_AC97CFG_TT_FIFO8 | PSC_AC97CFG_DE_ENABLE; /* preserve PSC clock source set up by platform */ sel = __raw_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK; __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); wmb(); /* drain writebuffer */ __raw_writel(0, PSC_SEL(wd)); wmb(); /* drain writebuffer */ __raw_writel(PSC_SEL_PS_AC97MODE | sel, PSC_SEL(wd)); wmb(); /* drain writebuffer */ /* name the DAI like this device instance ("au1xpsc-ac97.PSCINDEX") */ memcpy(&wd->dai_drv, &au1xpsc_ac97_dai_template, sizeof(struct snd_soc_dai_driver)); wd->dai_drv.name = dev_name(&pdev->dev); platform_set_drvdata(pdev, wd); ret = snd_soc_set_ac97_ops(&psc_ac97_ops); if (ret) return ret; ret = snd_soc_register_component(&pdev->dev, &au1xpsc_ac97_component, &wd->dai_drv, 1); if (ret) return ret; au1xpsc_ac97_workdata = wd; return 0; } static void au1xpsc_ac97_drvremove(struct platform_device *pdev) { struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev); snd_soc_unregister_component(&pdev->dev); /* disable PSC completely */ __raw_writel(0, AC97_CFG(wd)); wmb(); /* drain writebuffer */ __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); wmb(); /* drain writebuffer */ au1xpsc_ac97_workdata = NULL; /* MDEV */ } #ifdef CONFIG_PM static int au1xpsc_ac97_drvsuspend(struct device *dev) { struct au1xpsc_audio_data *wd = dev_get_drvdata(dev); /* save interesting registers and disable PSC */ wd->pm[0] = __raw_readl(PSC_SEL(wd)); __raw_writel(0, AC97_CFG(wd)); wmb(); /* drain writebuffer */ __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); wmb(); /* drain writebuffer */ return 0; } static int au1xpsc_ac97_drvresume(struct device *dev) { struct au1xpsc_audio_data *wd = dev_get_drvdata(dev); /* restore PSC clock config */ __raw_writel(wd->pm[0] | PSC_SEL_PS_AC97MODE, PSC_SEL(wd)); wmb(); /* drain writebuffer */ /* after this point the ac97 core will cold-reset the codec. * During cold-reset the PSC is reinitialized and the last * configuration set up in hw_params() is restored. */ return 0; } static const struct dev_pm_ops au1xpscac97_pmops = { .suspend = au1xpsc_ac97_drvsuspend, .resume = au1xpsc_ac97_drvresume, }; #define AU1XPSCAC97_PMOPS &au1xpscac97_pmops #else #define AU1XPSCAC97_PMOPS NULL #endif static struct platform_driver au1xpsc_ac97_driver = { .driver = { .name = "au1xpsc_ac97", .pm = AU1XPSCAC97_PMOPS, }, .probe = au1xpsc_ac97_drvprobe, .remove = au1xpsc_ac97_drvremove, }; module_platform_driver(au1xpsc_ac97_driver); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver"); MODULE_AUTHOR("Manuel Lauss");