258 lines
7.1 KiB
C
258 lines
7.1 KiB
C
/*
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* TXx9 ACLC AC97 driver
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*
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* Copyright (C) 2009 Atsushi Nemoto
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*
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* Based on RBTX49xx patch from CELF patch archive.
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* (C) Copyright TOSHIBA CORPORATION 2004-2006
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/gfp.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/soc.h>
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#include "txx9aclc.h"
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#define AC97_DIR \
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(SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
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#define AC97_RATES \
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SNDRV_PCM_RATE_8000_48000
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#ifdef __BIG_ENDIAN
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#define AC97_FMTS SNDRV_PCM_FMTBIT_S16_BE
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#else
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#define AC97_FMTS SNDRV_PCM_FMTBIT_S16_LE
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#endif
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static DECLARE_WAIT_QUEUE_HEAD(ac97_waitq);
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/* REVISIT: How to find txx9aclc_soc_device from snd_ac97? */
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static struct txx9aclc_soc_device *txx9aclc_soc_dev;
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static int txx9aclc_regready(struct txx9aclc_soc_device *dev)
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{
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struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
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return __raw_readl(drvdata->base + ACINTSTS) & ACINT_REGACCRDY;
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}
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/* AC97 controller reads codec register */
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static unsigned short txx9aclc_ac97_read(struct snd_ac97 *ac97,
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unsigned short reg)
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{
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struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
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struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
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void __iomem *base = drvdata->base;
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u32 dat;
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if (!(__raw_readl(base + ACINTSTS) & ACINT_CODECRDY(ac97->num)))
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return 0xffff;
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reg |= ac97->num << 7;
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dat = (reg << ACREGACC_REG_SHIFT) | ACREGACC_READ;
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__raw_writel(dat, base + ACREGACC);
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__raw_writel(ACINT_REGACCRDY, base + ACINTEN);
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if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(dev), HZ)) {
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__raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
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dev_err(dev->soc_dev.dev, "ac97 read timeout (reg %#x)\n", reg);
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dat = 0xffff;
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goto done;
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}
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dat = __raw_readl(base + ACREGACC);
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if (((dat >> ACREGACC_REG_SHIFT) & 0xff) != reg) {
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dev_err(dev->soc_dev.dev, "reg mismatch %x with %x\n",
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dat, reg);
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dat = 0xffff;
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goto done;
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}
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dat = (dat >> ACREGACC_DAT_SHIFT) & 0xffff;
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done:
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__raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
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return dat;
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}
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/* AC97 controller writes to codec register */
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static void txx9aclc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
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unsigned short val)
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{
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struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
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struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
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void __iomem *base = drvdata->base;
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__raw_writel(((reg | (ac97->num << 7)) << ACREGACC_REG_SHIFT) |
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(val << ACREGACC_DAT_SHIFT),
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base + ACREGACC);
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__raw_writel(ACINT_REGACCRDY, base + ACINTEN);
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if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(dev), HZ)) {
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dev_err(dev->soc_dev.dev,
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"ac97 write timeout (reg %#x)\n", reg);
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}
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__raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
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}
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static void txx9aclc_ac97_cold_reset(struct snd_ac97 *ac97)
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{
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struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
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struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
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void __iomem *base = drvdata->base;
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u32 ready = ACINT_CODECRDY(ac97->num) | ACINT_REGACCRDY;
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__raw_writel(ACCTL_ENLINK, base + ACCTLDIS);
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mmiowb();
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udelay(1);
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__raw_writel(ACCTL_ENLINK, base + ACCTLEN);
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/* wait for primary codec ready status */
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__raw_writel(ready, base + ACINTEN);
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if (!wait_event_timeout(ac97_waitq,
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(__raw_readl(base + ACINTSTS) & ready) == ready,
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HZ)) {
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dev_err(&ac97->dev, "primary codec is not ready "
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"(status %#x)\n",
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__raw_readl(base + ACINTSTS));
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}
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__raw_writel(ACINT_REGACCRDY, base + ACINTSTS);
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__raw_writel(ready, base + ACINTDIS);
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}
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/* AC97 controller operations */
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struct snd_ac97_bus_ops soc_ac97_ops = {
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.read = txx9aclc_ac97_read,
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.write = txx9aclc_ac97_write,
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.reset = txx9aclc_ac97_cold_reset,
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};
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EXPORT_SYMBOL_GPL(soc_ac97_ops);
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static irqreturn_t txx9aclc_ac97_irq(int irq, void *dev_id)
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{
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struct txx9aclc_plat_drvdata *drvdata = dev_id;
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void __iomem *base = drvdata->base;
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__raw_writel(__raw_readl(base + ACINTMSTS), base + ACINTDIS);
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wake_up(&ac97_waitq);
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return IRQ_HANDLED;
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}
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static int txx9aclc_ac97_probe(struct platform_device *pdev,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_device *socdev = platform_get_drvdata(pdev);
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struct txx9aclc_soc_device *dev =
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container_of(socdev, struct txx9aclc_soc_device, soc_dev);
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dev->aclc_pdev = to_platform_device(dai->dev);
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txx9aclc_soc_dev = dev;
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return 0;
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}
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static void txx9aclc_ac97_remove(struct platform_device *pdev,
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struct snd_soc_dai *dai)
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{
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struct platform_device *aclc_pdev = to_platform_device(dai->dev);
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struct txx9aclc_plat_drvdata *drvdata = platform_get_drvdata(aclc_pdev);
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/* disable AC-link */
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__raw_writel(ACCTL_ENLINK, drvdata->base + ACCTLDIS);
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txx9aclc_soc_dev = NULL;
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}
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struct snd_soc_dai txx9aclc_ac97_dai = {
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.name = "txx9aclc_ac97",
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.ac97_control = 1,
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.probe = txx9aclc_ac97_probe,
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.remove = txx9aclc_ac97_remove,
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.playback = {
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.rates = AC97_RATES,
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.formats = AC97_FMTS,
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.channels_min = 2,
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.channels_max = 2,
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},
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.capture = {
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.rates = AC97_RATES,
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.formats = AC97_FMTS,
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.channels_min = 2,
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.channels_max = 2,
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},
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};
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EXPORT_SYMBOL_GPL(txx9aclc_ac97_dai);
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static int __devinit txx9aclc_ac97_dev_probe(struct platform_device *pdev)
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{
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struct txx9aclc_plat_drvdata *drvdata;
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struct resource *r;
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int err;
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int irq;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r)
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return -EBUSY;
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if (!devm_request_mem_region(&pdev->dev, r->start, resource_size(r),
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dev_name(&pdev->dev)))
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return -EBUSY;
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drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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platform_set_drvdata(pdev, drvdata);
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drvdata->physbase = r->start;
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if (sizeof(drvdata->physbase) > sizeof(r->start) &&
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r->start >= TXX9_DIRECTMAP_BASE &&
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r->start < TXX9_DIRECTMAP_BASE + 0x400000)
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drvdata->physbase |= 0xf00000000ull;
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drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
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if (!drvdata->base)
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return -EBUSY;
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err = devm_request_irq(&pdev->dev, irq, txx9aclc_ac97_irq,
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IRQF_DISABLED, dev_name(&pdev->dev), drvdata);
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if (err < 0)
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return err;
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txx9aclc_ac97_dai.dev = &pdev->dev;
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return snd_soc_register_dai(&txx9aclc_ac97_dai);
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}
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static int __devexit txx9aclc_ac97_dev_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_dai(&txx9aclc_ac97_dai);
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return 0;
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}
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static struct platform_driver txx9aclc_ac97_driver = {
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.probe = txx9aclc_ac97_dev_probe,
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.remove = __devexit_p(txx9aclc_ac97_dev_remove),
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.driver = {
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.name = "txx9aclc-ac97",
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.owner = THIS_MODULE,
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},
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};
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static int __init txx9aclc_ac97_init(void)
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{
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return platform_driver_register(&txx9aclc_ac97_driver);
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}
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static void __exit txx9aclc_ac97_exit(void)
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{
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platform_driver_unregister(&txx9aclc_ac97_driver);
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}
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module_init(txx9aclc_ac97_init);
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module_exit(txx9aclc_ac97_exit);
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MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
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MODULE_DESCRIPTION("TXx9 ACLC AC97 driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:txx9aclc-ac97");
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