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linux-next/sound/soc/au1x/ac97c.c
Julia Lawall 226d0f22d0 ASoC: keep pointer to resource so it can be freed 
Add a new variable for storing resources accessed subsequent to the one
accessed using request_mem_region, so the one accessed using
request_mem_region can be released if needed.

The resource variable names are also changed to be more descriptive.

This code is also missing some calls to iounmap.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
expression E, E1;
identifier f;
statement S1,S2,S3;
@@

if (E == NULL)
{
  ... when != if (E == NULL || ...) S1 else S2
      when != E = E1
*E->f
  ... when any
  return ...;
}
else S3
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2011-10-22 10:46:35 +01:00

367 lines
8.6 KiB
C
Raw Blame History

/*
* Au1000/Au1500/Au1100 AC97C controller driver for ASoC
*
* (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com>
*
* based on the old ALSA driver originally written by
* Charles Eidsness <charles@cooper-street.com>
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/platform_device.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 "psc.h"
/* register offsets and bits */
#define AC97_CONFIG 0x00
#define AC97_STATUS 0x04
#define AC97_DATA 0x08
#define AC97_CMDRESP 0x0c
#define AC97_ENABLE 0x10
#define CFG_RC(x) (((x) & 0x3ff) << 13) /* valid rx slots mask */
#define CFG_XS(x) (((x) & 0x3ff) << 3) /* valid tx slots mask */
#define CFG_SG (1 << 2) /* sync gate */
#define CFG_SN (1 << 1) /* sync control */
#define CFG_RS (1 << 0) /* acrst# control */
#define STAT_XU (1 << 11) /* tx underflow */
#define STAT_XO (1 << 10) /* tx overflow */
#define STAT_RU (1 << 9) /* rx underflow */
#define STAT_RO (1 << 8) /* rx overflow */
#define STAT_RD (1 << 7) /* codec ready */
#define STAT_CP (1 << 6) /* command pending */
#define STAT_TE (1 << 4) /* tx fifo empty */
#define STAT_TF (1 << 3) /* tx fifo full */
#define STAT_RE (1 << 1) /* rx fifo empty */
#define STAT_RF (1 << 0) /* rx fifo full */
#define CMD_SET_DATA(x) (((x) & 0xffff) << 16)
#define CMD_GET_DATA(x) ((x) & 0xffff)
#define CMD_READ (1 << 7)
#define CMD_WRITE (0 << 7)
#define CMD_IDX(x) ((x) & 0x7f)
#define EN_D (1 << 1) /* DISable bit */
#define EN_CE (1 << 0) /* clock enable bit */
/* how often to retry failed codec register reads/writes */
#define AC97_RW_RETRIES 5
#define AC97_RATES \
SNDRV_PCM_RATE_CONTINUOUS
#define AC97_FMTS \
(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE)
/* instance data. There can be only one, MacLeod!!!!, fortunately there IS only
* once AC97C on early Alchemy chips. The newer ones aren't so lucky.
*/
static struct au1xpsc_audio_data *ac97c_workdata;
#define ac97_to_ctx(x) ac97c_workdata
static inline unsigned long RD(struct au1xpsc_audio_data *ctx, int reg)
{
return __raw_readl(ctx->mmio + reg);
}
static inline void WR(struct au1xpsc_audio_data *ctx, int reg, unsigned long v)
{
__raw_writel(v, ctx->mmio + reg);
wmb();
}
static unsigned short au1xac97c_ac97_read(struct snd_ac97 *ac97,
unsigned short r)
{
struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);
unsigned int tmo, retry;
unsigned long data;
data = ~0;
retry = AC97_RW_RETRIES;
do {
mutex_lock(&ctx->lock);
tmo = 5;
while ((RD(ctx, AC97_STATUS) & STAT_CP) && tmo--)
udelay(21); /* wait an ac97 frame time */
if (!tmo) {
pr_debug("ac97rd timeout #1\n");
goto next;
}
WR(ctx, AC97_CMDRESP, CMD_IDX(r) | CMD_READ);
/* stupid errata: data is only valid for 21us, so
* poll, Forrest, poll...
*/
tmo = 0x10000;
while ((RD(ctx, AC97_STATUS) & STAT_CP) && tmo--)
asm volatile ("nop");
data = RD(ctx, AC97_CMDRESP);
if (!tmo)
pr_debug("ac97rd timeout #2\n");
next:
mutex_unlock(&ctx->lock);
} while (--retry && !tmo);
pr_debug("AC97RD %04x %04lx %d\n", r, data, retry);
return retry ? data & 0xffff : 0xffff;
}
static void au1xac97c_ac97_write(struct snd_ac97 *ac97, unsigned short r,
unsigned short v)
{
struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);
unsigned int tmo, retry;
retry = AC97_RW_RETRIES;
do {
mutex_lock(&ctx->lock);
for (tmo = 5; (RD(ctx, AC97_STATUS) & STAT_CP) && tmo; tmo--)
udelay(21);
if (!tmo) {
pr_debug("ac97wr timeout #1\n");
goto next;
}
WR(ctx, AC97_CMDRESP, CMD_WRITE | CMD_IDX(r) | CMD_SET_DATA(v));
for (tmo = 10; (RD(ctx, AC97_STATUS) & STAT_CP) && tmo; tmo--)
udelay(21);
if (!tmo)
pr_debug("ac97wr timeout #2\n");
next:
mutex_unlock(&ctx->lock);
} while (--retry && !tmo);
pr_debug("AC97WR %04x %04x %d\n", r, v, retry);
}
static void au1xac97c_ac97_warm_reset(struct snd_ac97 *ac97)
{
struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);
WR(ctx, AC97_CONFIG, ctx->cfg | CFG_SG | CFG_SN);
msleep(20);
WR(ctx, AC97_CONFIG, ctx->cfg | CFG_SG);
WR(ctx, AC97_CONFIG, ctx->cfg);
}
static void au1xac97c_ac97_cold_reset(struct snd_ac97 *ac97)
{
struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);
int i;
WR(ctx, AC97_CONFIG, ctx->cfg | CFG_RS);
msleep(500);
WR(ctx, AC97_CONFIG, ctx->cfg);
/* wait for codec ready */
i = 50;
while (((RD(ctx, AC97_STATUS) & STAT_RD) == 0) && --i)
msleep(20);
if (!i)
printk(KERN_ERR "ac97c: codec not ready after cold reset\n");
}
/* AC97 controller operations */
struct snd_ac97_bus_ops soc_ac97_ops = {
.read = au1xac97c_ac97_read,
.write = au1xac97c_ac97_write,
.reset = au1xac97c_ac97_cold_reset,
.warm_reset = au1xac97c_ac97_warm_reset,
};
EXPORT_SYMBOL_GPL(soc_ac97_ops); /* globals be gone! */
static int alchemy_ac97c_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(dai);
snd_soc_dai_set_dma_data(dai, substream, &ctx->dmaids[0]);
return 0;
}
static struct snd_soc_dai_ops alchemy_ac97c_ops = {
.startup = alchemy_ac97c_startup,
};
static int au1xac97c_dai_probe(struct snd_soc_dai *dai)
{
return ac97c_workdata ? 0 : -ENODEV;
}
static struct snd_soc_dai_driver au1xac97c_dai_driver = {
.name = "alchemy-ac97c",
.ac97_control = 1,
.probe = au1xac97c_dai_probe,
.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 = &alchemy_ac97c_ops,
};
static int __devinit au1xac97c_drvprobe(struct platform_device *pdev)
{
int ret;
struct resource *iores, *dmares;
struct au1xpsc_audio_data *ctx;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
mutex_init(&ctx->lock);
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!iores) {
ret = -ENODEV;
goto out0;
}
ret = -EBUSY;
if (!request_mem_region(iores->start, resource_size(iores),
pdev->name))
goto out0;
ctx->mmio = ioremap_nocache(iores->start, resource_size(iores));
if (!ctx->mmio)
goto out1;
dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (!dmares)
goto out2;
ctx->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;
dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
if (!dmares)
goto out2;
ctx->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;
/* switch it on */
WR(ctx, AC97_ENABLE, EN_D | EN_CE);
WR(ctx, AC97_ENABLE, EN_CE);
ctx->cfg = CFG_RC(3) | CFG_XS(3);
WR(ctx, AC97_CONFIG, ctx->cfg);
platform_set_drvdata(pdev, ctx);
ret = snd_soc_register_dai(&pdev->dev, &au1xac97c_dai_driver);
if (ret)
goto out2;
ac97c_workdata = ctx;
return 0;
out2:
iounmap(ctx->mmio);
out1:
release_mem_region(iores->start, resource_size(iores));
out0:
kfree(ctx);
return ret;
}
static int __devexit au1xac97c_drvremove(struct platform_device *pdev)
{
struct au1xpsc_audio_data *ctx = platform_get_drvdata(pdev);
struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
snd_soc_unregister_dai(&pdev->dev);
WR(ctx, AC97_ENABLE, EN_D); /* clock off, disable */
iounmap(ctx->mmio);
release_mem_region(r->start, resource_size(r));
kfree(ctx);
ac97c_workdata = NULL; /* MDEV */
return 0;
}
#ifdef CONFIG_PM
static int au1xac97c_drvsuspend(struct device *dev)
{
struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev);
WR(ctx, AC97_ENABLE, EN_D); /* clock off, disable */
return 0;
}
static int au1xac97c_drvresume(struct device *dev)
{
struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev);
WR(ctx, AC97_ENABLE, EN_D | EN_CE);
WR(ctx, AC97_ENABLE, EN_CE);
WR(ctx, AC97_CONFIG, ctx->cfg);
return 0;
}
static const struct dev_pm_ops au1xpscac97_pmops = {
.suspend = au1xac97c_drvsuspend,
.resume = au1xac97c_drvresume,
};
#define AU1XPSCAC97_PMOPS (&au1xpscac97_pmops)
#else
#define AU1XPSCAC97_PMOPS NULL
#endif
static struct platform_driver au1xac97c_driver = {
.driver = {
.name = "alchemy-ac97c",
.owner = THIS_MODULE,
.pm = AU1XPSCAC97_PMOPS,
},
.probe = au1xac97c_drvprobe,
.remove = __devexit_p(au1xac97c_drvremove),
};
static int __init au1xac97c_load(void)
{
ac97c_workdata = NULL;
return platform_driver_register(&au1xac97c_driver);
}
static void __exit au1xac97c_unload(void)
{
platform_driver_unregister(&au1xac97c_driver);
}
module_init(au1xac97c_load);
module_exit(au1xac97c_unload);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Au1000/1500/1100 AC97C ASoC driver");
MODULE_AUTHOR("Manuel Lauss");
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