diff options
Diffstat (limited to 'sound/soc/txx9/txx9aclc-ac97.c')
| -rw-r--r-- | sound/soc/txx9/txx9aclc-ac97.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/sound/soc/txx9/txx9aclc-ac97.c b/sound/soc/txx9/txx9aclc-ac97.c new file mode 100644 index 000000000..e2ad00e3c --- /dev/null +++ b/sound/soc/txx9/txx9aclc-ac97.c @@ -0,0 +1,235 @@ +/* + * TXx9 ACLC AC97 driver + * + * Copyright (C) 2009 Atsushi Nemoto + * + * Based on RBTX49xx patch from CELF patch archive. + * (C) Copyright TOSHIBA CORPORATION 2004-2006 + * + * 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/init.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/gfp.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/soc.h> +#include "txx9aclc.h" + +#define AC97_DIR \ + (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE) + +#define AC97_RATES \ + SNDRV_PCM_RATE_8000_48000 + +#ifdef __BIG_ENDIAN +#define AC97_FMTS SNDRV_PCM_FMTBIT_S16_BE +#else +#define AC97_FMTS SNDRV_PCM_FMTBIT_S16_LE +#endif + +static DECLARE_WAIT_QUEUE_HEAD(ac97_waitq); + +/* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */ +static struct txx9aclc_plat_drvdata *txx9aclc_drvdata; + +static int txx9aclc_regready(struct txx9aclc_plat_drvdata *drvdata) +{ + return __raw_readl(drvdata->base + ACINTSTS) & ACINT_REGACCRDY; +} + +/* AC97 controller reads codec register */ +static unsigned short txx9aclc_ac97_read(struct snd_ac97 *ac97, + unsigned short reg) +{ + struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata; + void __iomem *base = drvdata->base; + u32 dat; + + if (!(__raw_readl(base + ACINTSTS) & ACINT_CODECRDY(ac97->num))) + return 0xffff; + reg |= ac97->num << 7; + dat = (reg << ACREGACC_REG_SHIFT) | ACREGACC_READ; + __raw_writel(dat, base + ACREGACC); + __raw_writel(ACINT_REGACCRDY, base + ACINTEN); + if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(txx9aclc_drvdata), HZ)) { + __raw_writel(ACINT_REGACCRDY, base + ACINTDIS); + printk(KERN_ERR "ac97 read timeout (reg %#x)\n", reg); + dat = 0xffff; + goto done; + } + dat = __raw_readl(base + ACREGACC); + if (((dat >> ACREGACC_REG_SHIFT) & 0xff) != reg) { + printk(KERN_ERR "reg mismatch %x with %x\n", + dat, reg); + dat = 0xffff; + goto done; + } + dat = (dat >> ACREGACC_DAT_SHIFT) & 0xffff; +done: + __raw_writel(ACINT_REGACCRDY, base + ACINTDIS); + return dat; +} + +/* AC97 controller writes to codec register */ +static void txx9aclc_ac97_write(struct snd_ac97 *ac97, unsigned short reg, + unsigned short val) +{ + struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata; + void __iomem *base = drvdata->base; + + __raw_writel(((reg | (ac97->num << 7)) << ACREGACC_REG_SHIFT) | + (val << ACREGACC_DAT_SHIFT), + base + ACREGACC); + __raw_writel(ACINT_REGACCRDY, base + ACINTEN); + if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(txx9aclc_drvdata), HZ)) { + printk(KERN_ERR + "ac97 write timeout (reg %#x)\n", reg); + } + __raw_writel(ACINT_REGACCRDY, base + ACINTDIS); +} + +static void txx9aclc_ac97_cold_reset(struct snd_ac97 *ac97) +{ + struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata; + void __iomem *base = drvdata->base; + u32 ready = ACINT_CODECRDY(ac97->num) | ACINT_REGACCRDY; + + __raw_writel(ACCTL_ENLINK, base + ACCTLDIS); + mmiowb(); + udelay(1); + __raw_writel(ACCTL_ENLINK, base + ACCTLEN); + /* wait for primary codec ready status */ + __raw_writel(ready, base + ACINTEN); + if (!wait_event_timeout(ac97_waitq, + (__raw_readl(base + ACINTSTS) & ready) == ready, + HZ)) { + dev_err(&ac97->dev, "primary codec is not ready " + "(status %#x)\n", + __raw_readl(base + ACINTSTS)); + } + __raw_writel(ACINT_REGACCRDY, base + ACINTSTS); + __raw_writel(ready, base + ACINTDIS); +} + +/* AC97 controller operations */ +static struct snd_ac97_bus_ops txx9aclc_ac97_ops = { + .read = txx9aclc_ac97_read, + .write = txx9aclc_ac97_write, + .reset = txx9aclc_ac97_cold_reset, +}; + +static irqreturn_t txx9aclc_ac97_irq(int irq, void *dev_id) +{ + struct txx9aclc_plat_drvdata *drvdata = dev_id; + void __iomem *base = drvdata->base; + + __raw_writel(__raw_readl(base + ACINTMSTS), base + ACINTDIS); + wake_up(&ac97_waitq); + return IRQ_HANDLED; +} + +static int txx9aclc_ac97_probe(struct snd_soc_dai *dai) +{ + txx9aclc_drvdata = snd_soc_dai_get_drvdata(dai); + return 0; +} + +static int txx9aclc_ac97_remove(struct snd_soc_dai *dai) +{ + struct txx9aclc_plat_drvdata *drvdata = snd_soc_dai_get_drvdata(dai); + + /* disable AC-link */ + __raw_writel(ACCTL_ENLINK, drvdata->base + ACCTLDIS); + txx9aclc_drvdata = NULL; + return 0; +} + +static struct snd_soc_dai_driver txx9aclc_ac97_dai = { + .bus_control = true, + .probe = txx9aclc_ac97_probe, + .remove = txx9aclc_ac97_remove, + .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, + }, +}; + +static const struct snd_soc_component_driver txx9aclc_ac97_component = { + .name = "txx9aclc-ac97", +}; + +static int txx9aclc_ac97_dev_probe(struct platform_device *pdev) +{ + struct txx9aclc_plat_drvdata *drvdata; + struct resource *r; + int err; + int irq; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + drvdata->base = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(drvdata->base)) + return PTR_ERR(drvdata->base); + + platform_set_drvdata(pdev, drvdata); + drvdata->physbase = r->start; + if (sizeof(drvdata->physbase) > sizeof(r->start) && + r->start >= TXX9_DIRECTMAP_BASE && + r->start < TXX9_DIRECTMAP_BASE + 0x400000) + drvdata->physbase |= 0xf00000000ull; + err = devm_request_irq(&pdev->dev, irq, txx9aclc_ac97_irq, + 0, dev_name(&pdev->dev), drvdata); + if (err < 0) + return err; + + err = snd_soc_set_ac97_ops(&txx9aclc_ac97_ops); + if (err < 0) + return err; + + return snd_soc_register_component(&pdev->dev, &txx9aclc_ac97_component, + &txx9aclc_ac97_dai, 1); +} + +static int txx9aclc_ac97_dev_remove(struct platform_device *pdev) +{ + snd_soc_unregister_component(&pdev->dev); + snd_soc_set_ac97_ops(NULL); + return 0; +} + +static struct platform_driver txx9aclc_ac97_driver = { + .probe = txx9aclc_ac97_dev_probe, + .remove = txx9aclc_ac97_dev_remove, + .driver = { + .name = "txx9aclc-ac97", + }, +}; + +module_platform_driver(txx9aclc_ac97_driver); + +MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>"); +MODULE_DESCRIPTION("TXx9 ACLC AC97 driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:txx9aclc-ac97"); |