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linux/sound/soc/s3c24xx/s3c-ac97.c
Daniel Mack 5f712b2b73 ALSA: ASoC: move dma_data from snd_soc_dai to snd_soc_pcm_stream 
This fixes a memory corruption when ASoC devices are used in
full-duplex mode. Specifically for pxa-ssp code, where this pointer
is dynamically allocated for each direction and destroyed upon each
stream start.

All other platforms are fixed blindly, I couldn't even compile-test
them. Sorry for any breakage I may have caused.

[Note that this is a backported version for 2.6.34.
 Upstream commit is fd23b7dee]

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Reported-by: Sven Neumann <s.neumann@raumfeld.com>
Reported-by: Michael Hirsch <m.hirsch@raumfeld.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2010-04-05 19:14:11 +01:00

522 lines
13 KiB
C
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/* sound/soc/s3c24xx/s3c-ac97.c
*
* ALSA SoC Audio Layer - S3C AC97 Controller driver
* Evolved from s3c2443-ac97.c
*
* Copyright (c) 2010 Samsung Electronics Co. Ltd
* Author: Jaswinder Singh <jassi.brar@samsung.com>
* Credits: Graeme Gregory, Sean Choi
*
* 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/io.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <sound/soc.h>
#include <plat/regs-ac97.h>
#include <mach/dma.h>
#include <plat/audio.h>
#include "s3c-dma.h"
#include "s3c-ac97.h"
#define AC_CMD_ADDR(x) (x << 16)
#define AC_CMD_DATA(x) (x & 0xffff)
struct s3c_ac97_info {
unsigned state;
struct clk *ac97_clk;
void __iomem *regs;
struct mutex lock;
struct completion done;
};
static struct s3c_ac97_info s3c_ac97;
static struct s3c2410_dma_client s3c_dma_client_out = {
.name = "AC97 PCMOut"
};
static struct s3c2410_dma_client s3c_dma_client_in = {
.name = "AC97 PCMIn"
};
static struct s3c2410_dma_client s3c_dma_client_micin = {
.name = "AC97 MicIn"
};
static struct s3c_dma_params s3c_ac97_pcm_out = {
.client = &s3c_dma_client_out,
.dma_size = 4,
};
static struct s3c_dma_params s3c_ac97_pcm_in = {
.client = &s3c_dma_client_in,
.dma_size = 4,
};
static struct s3c_dma_params s3c_ac97_mic_in = {
.client = &s3c_dma_client_micin,
.dma_size = 4,
};
static void s3c_ac97_activate(struct snd_ac97 *ac97)
{
u32 ac_glbctrl, stat;
stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
return; /* Return if already active */
INIT_COMPLETION(s3c_ac97.done);
ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
msleep(1);
ac_glbctrl |= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
msleep(1);
ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
printk(KERN_ERR "AC97: Unable to activate!");
}
static unsigned short s3c_ac97_read(struct snd_ac97 *ac97,
unsigned short reg)
{
u32 ac_glbctrl, ac_codec_cmd;
u32 stat, addr, data;
mutex_lock(&s3c_ac97.lock);
s3c_ac97_activate(ac97);
INIT_COMPLETION(s3c_ac97.done);
ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
ac_codec_cmd = S3C_AC97_CODEC_CMD_READ | AC_CMD_ADDR(reg);
writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
udelay(50);
ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
printk(KERN_ERR "AC97: Unable to read!");
stat = readl(s3c_ac97.regs + S3C_AC97_STAT);
addr = (stat >> 16) & 0x7f;
data = (stat & 0xffff);
if (addr != reg)
printk(KERN_ERR "s3c-ac97: req addr = %02x, rep addr = %02x\n", reg, addr);
mutex_unlock(&s3c_ac97.lock);
return (unsigned short)data;
}
static void s3c_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
unsigned short val)
{
u32 ac_glbctrl, ac_codec_cmd;
mutex_lock(&s3c_ac97.lock);
s3c_ac97_activate(ac97);
INIT_COMPLETION(s3c_ac97.done);
ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
ac_codec_cmd = AC_CMD_ADDR(reg) | AC_CMD_DATA(val);
writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
udelay(50);
ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
printk(KERN_ERR "AC97: Unable to write!");
ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
ac_codec_cmd |= S3C_AC97_CODEC_CMD_READ;
writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
mutex_unlock(&s3c_ac97.lock);
}
static void s3c_ac97_cold_reset(struct snd_ac97 *ac97)
{
writel(S3C_AC97_GLBCTRL_COLDRESET,
s3c_ac97.regs + S3C_AC97_GLBCTRL);
msleep(1);
writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
msleep(1);
}
static void s3c_ac97_warm_reset(struct snd_ac97 *ac97)
{
u32 stat;
stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
return; /* Return if already active */
writel(S3C_AC97_GLBCTRL_WARMRESET, s3c_ac97.regs + S3C_AC97_GLBCTRL);
msleep(1);
writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
msleep(1);
s3c_ac97_activate(ac97);
}
static irqreturn_t s3c_ac97_irq(int irq, void *dev_id)
{
u32 ac_glbctrl, ac_glbstat;
ac_glbstat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT);
if (ac_glbstat & S3C_AC97_GLBSTAT_CODECREADY) {
ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
ac_glbctrl &= ~S3C_AC97_GLBCTRL_CODECREADYIE;
writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
complete(&s3c_ac97.done);
}
ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
ac_glbctrl |= (1<<30); /* Clear interrupt */
writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
return IRQ_HANDLED;
}
struct snd_ac97_bus_ops soc_ac97_ops = {
.read = s3c_ac97_read,
.write = s3c_ac97_write,
.warm_reset = s3c_ac97_warm_reset,
.reset = s3c_ac97_cold_reset,
};
EXPORT_SYMBOL_GPL(soc_ac97_ops);
static int s3c_ac97_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
struct s3c_dma_params *dma_data;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
dma_data = &s3c_ac97_pcm_out;
else
dma_data = &s3c_ac97_pcm_in;
snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
return 0;
}
static int s3c_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
u32 ac_glbctrl;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct s3c_dma_params *dma_data =
snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
else
ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMOUTTM_MASK;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
ac_glbctrl |= S3C_AC97_GLBCTRL_PCMINTM_DMA;
else
ac_glbctrl |= S3C_AC97_GLBCTRL_PCMOUTTM_DMA;
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
break;
}
writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
s3c2410_dma_ctrl(dma_data->channel, S3C2410_DMAOP_STARTED);
return 0;
}
static int s3c_ac97_hw_mic_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
return -ENODEV;
else
snd_soc_dai_set_dma_data(cpu_dai, substream, &s3c_ac97_mic_in);
return 0;
}
static int s3c_ac97_mic_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
u32 ac_glbctrl;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct s3c_dma_params *dma_data =
snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
ac_glbctrl &= ~S3C_AC97_GLBCTRL_MICINTM_MASK;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
ac_glbctrl |= S3C_AC97_GLBCTRL_MICINTM_DMA;
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
break;
}
writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
s3c2410_dma_ctrl(dma_data->channel, S3C2410_DMAOP_STARTED);
return 0;
}
static struct snd_soc_dai_ops s3c_ac97_dai_ops = {
.hw_params = s3c_ac97_hw_params,
.trigger = s3c_ac97_trigger,
};
static struct snd_soc_dai_ops s3c_ac97_mic_dai_ops = {
.hw_params = s3c_ac97_hw_mic_params,
.trigger = s3c_ac97_mic_trigger,
};
struct snd_soc_dai s3c_ac97_dai[] = {
[S3C_AC97_DAI_PCM] = {
.name = "s3c-ac97",
.id = S3C_AC97_DAI_PCM,
.ac97_control = 1,
.playback = {
.stream_name = "AC97 Playback",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,},
.capture = {
.stream_name = "AC97 Capture",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,},
.ops = &s3c_ac97_dai_ops,
},
[S3C_AC97_DAI_MIC] = {
.name = "s3c-ac97-mic",
.id = S3C_AC97_DAI_MIC,
.ac97_control = 1,
.capture = {
.stream_name = "AC97 Mic Capture",
.channels_min = 1,
.channels_max = 1,
.rates = SNDRV_PCM_RATE_8000_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,},
.ops = &s3c_ac97_mic_dai_ops,
},
};
EXPORT_SYMBOL_GPL(s3c_ac97_dai);
static __devinit int s3c_ac97_probe(struct platform_device *pdev)
{
struct resource *mem_res, *dmatx_res, *dmarx_res, *dmamic_res, *irq_res;
struct s3c_audio_pdata *ac97_pdata;
int ret;
ac97_pdata = pdev->dev.platform_data;
if (!ac97_pdata || !ac97_pdata->cfg_gpio) {
dev_err(&pdev->dev, "cfg_gpio callback not provided!\n");
return -EINVAL;
}
/* Check for availability of necessary resource */
dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (!dmatx_res) {
dev_err(&pdev->dev, "Unable to get AC97-TX dma resource\n");
return -ENXIO;
}
dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
if (!dmarx_res) {
dev_err(&pdev->dev, "Unable to get AC97-RX dma resource\n");
return -ENXIO;
}
dmamic_res = platform_get_resource(pdev, IORESOURCE_DMA, 2);
if (!dmamic_res) {
dev_err(&pdev->dev, "Unable to get AC97-MIC dma resource\n");
return -ENXIO;
}
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem_res) {
dev_err(&pdev->dev, "Unable to get register resource\n");
return -ENXIO;
}
irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!irq_res) {
dev_err(&pdev->dev, "AC97 IRQ not provided!\n");
return -ENXIO;
}
if (!request_mem_region(mem_res->start,
resource_size(mem_res), "s3c-ac97")) {
dev_err(&pdev->dev, "Unable to request register region\n");
return -EBUSY;
}
s3c_ac97_pcm_out.channel = dmatx_res->start;
s3c_ac97_pcm_out.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
s3c_ac97_pcm_in.channel = dmarx_res->start;
s3c_ac97_pcm_in.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
s3c_ac97_mic_in.channel = dmamic_res->start;
s3c_ac97_mic_in.dma_addr = mem_res->start + S3C_AC97_MIC_DATA;
init_completion(&s3c_ac97.done);
mutex_init(&s3c_ac97.lock);
s3c_ac97.regs = ioremap(mem_res->start, resource_size(mem_res));
if (s3c_ac97.regs == NULL) {
dev_err(&pdev->dev, "Unable to ioremap register region\n");
ret = -ENXIO;
goto err1;
}
s3c_ac97.ac97_clk = clk_get(&pdev->dev, "ac97");
if (IS_ERR(s3c_ac97.ac97_clk)) {
dev_err(&pdev->dev, "s3c-ac97 failed to get ac97_clock\n");
ret = -ENODEV;
goto err2;
}
clk_enable(s3c_ac97.ac97_clk);
if (ac97_pdata->cfg_gpio(pdev)) {
dev_err(&pdev->dev, "Unable to configure gpio\n");
ret = -EINVAL;
goto err3;
}
ret = request_irq(irq_res->start, s3c_ac97_irq,
IRQF_DISABLED, "AC97", NULL);
if (ret < 0) {
printk(KERN_ERR "s3c-ac97: interrupt request failed.\n");
goto err4;
}
s3c_ac97_dai[S3C_AC97_DAI_PCM].dev = &pdev->dev;
s3c_ac97_dai[S3C_AC97_DAI_MIC].dev = &pdev->dev;
ret = snd_soc_register_dais(s3c_ac97_dai, ARRAY_SIZE(s3c_ac97_dai));
if (ret)
goto err5;
return 0;
err5:
free_irq(irq_res->start, NULL);
err4:
err3:
clk_disable(s3c_ac97.ac97_clk);
clk_put(s3c_ac97.ac97_clk);
err2:
iounmap(s3c_ac97.regs);
err1:
release_mem_region(mem_res->start, resource_size(mem_res));
return ret;
}
static __devexit int s3c_ac97_remove(struct platform_device *pdev)
{
struct resource *mem_res, *irq_res;
snd_soc_unregister_dais(s3c_ac97_dai, ARRAY_SIZE(s3c_ac97_dai));
irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (irq_res)
free_irq(irq_res->start, NULL);
clk_disable(s3c_ac97.ac97_clk);
clk_put(s3c_ac97.ac97_clk);
iounmap(s3c_ac97.regs);
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (mem_res)
release_mem_region(mem_res->start, resource_size(mem_res));
return 0;
}
static struct platform_driver s3c_ac97_driver = {
.probe = s3c_ac97_probe,
.remove = s3c_ac97_remove,
.driver = {
.name = "s3c-ac97",
.owner = THIS_MODULE,
},
};
static int __init s3c_ac97_init(void)
{
return platform_driver_register(&s3c_ac97_driver);
}
module_init(s3c_ac97_init);
static void __exit s3c_ac97_exit(void)
{
platform_driver_unregister(&s3c_ac97_driver);
}
module_exit(s3c_ac97_exit);
MODULE_AUTHOR("Jaswinder Singh, <jassi.brar@samsung.com>");
MODULE_DESCRIPTION("AC97 driver for the Samsung SoC");
MODULE_LICENSE("GPL");
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