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[ALSA] Add ARM PXA2xx AC97 driver

Browse source 
Documentation,ARM,/arm/Makefile,ARM PXA2XX driver
Added ARM PXA2xx AC97 driver by Nicolas Pitre
(moved from alsa-driver tree).

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2005-06-30 18:54:04 +02:00 committed by Jaroslav Kysela
parent 1bd9debf25
commit 2c484df0d2
6 changed files with 833 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
Documentation/sound/alsa/ALSA-Configuration.txt
View file

@ -1059,6 +1059,13 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
The power-management is supported.
Module snd-pxa2xx-ac97 (on arm only)
------------------------------------
Module for AC97 driver for the Intel PXA2xx chip
For ARM architecture only.
Module snd-rme32
----------------

14
sound/arm/Kconfig
View file

@ -20,5 +20,17 @@ config SND_ARMAACI
select SND_PCM
select SND_AC97_CODEC
endmenu
config SND_PXA2XX_PCM
tristate
select SND_PCM
config SND_PXA2XX_AC97
tristate "AC97 driver for the Intel PXA2xx chip"
depends on ARCH_PXA && SND
select SND_PXA2XX_PCM
select SND_AC97_CODEC
help
Say Y or M if you want to support any AC97 codec attached to
the PXA2xx AC97 interface.
endmenu

12
sound/arm/Makefile
View file

@ -3,9 +3,11 @@
#
snd-sa11xx-uda1341-objs := sa11xx-uda1341.o
# Toplevel Module Dependency
obj-$(CONFIG_SND_SA11XX_UDA1341) += snd-sa11xx-uda1341.o
obj-$(CONFIG_SND_ARMAACI) += snd-aaci.o
snd-aaci-objs := aaci.o devdma.o
snd-pxa2xx-pcm-objs := pxa2xx-pcm.o
snd-pxa2xx-ac97-objs := pxa2xx-ac97.o
obj-$(CONFIG_SND_SA11XX_UDA1341) += snd-sa11xx-uda1341.o
obj-$(CONFIG_SND_ARMAACI) += snd-aaci.o
obj-$(CONFIG_SND_PXA2XX_PCM) += snd-pxa2xx-pcm.o
obj-$(CONFIG_SND_PXA2XX_AC97) += snd-pxa2xx-ac97.o

410
sound/arm/pxa2xx-ac97.c Normal file
View file

@ -0,0 +1,410 @@
/*
* linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
*
* Author: Nicolas Pitre
* Created: Dec 02, 2004
* Copyright: MontaVista Software Inc.
*
* 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/kernel.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/delay.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <asm/irq.h>
#include <asm/semaphore.h>
#include <asm/hardware.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/audio.h>
#include "pxa2xx-pcm.h"
static DECLARE_MUTEX(car_mutex);
static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
static volatile long gsr_bits;
static unsigned short pxa2xx_ac97_read(ac97_t *ac97, unsigned short reg)
{
unsigned short val = -1;
volatile u32 *reg_addr;
down(&car_mutex);
if (CAR & CAR_CAIP) {
printk(KERN_CRIT"%s: CAR_CAIP already set\n", __FUNCTION__);
goto out;
}
/* set up primary or secondary codec space */
reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
reg_addr += (reg >> 1);
/* start read access across the ac97 link */
gsr_bits = 0;
val = *reg_addr;
if (reg == AC97_GPIO_STATUS)
goto out;
wait_event_timeout(gsr_wq, gsr_bits & GSR_SDONE, 1);
if (!gsr_bits & GSR_SDONE) {
printk(KERN_ERR "%s: read error (ac97_reg=%d GSR=%#lx)\n",
__FUNCTION__, reg, gsr_bits);
val = -1;
goto out;
}
/* valid data now */
gsr_bits = 0;
val = *reg_addr;
/* but we've just started another cycle... */
wait_event_timeout(gsr_wq, gsr_bits & GSR_SDONE, 1);
out: up(&car_mutex);
return val;
}
static void pxa2xx_ac97_write(ac97_t *ac97, unsigned short reg, unsigned short val)
{
volatile u32 *reg_addr;
down(&car_mutex);
if (CAR & CAR_CAIP) {
printk(KERN_CRIT "%s: CAR_CAIP already set\n", __FUNCTION__);
goto out;
}
/* set up primary or secondary codec space */
reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
reg_addr += (reg >> 1);
gsr_bits = 0;
*reg_addr = val;
wait_event_timeout(gsr_wq, gsr_bits & GSR_CDONE, 1);
if (!gsr_bits & GSR_SDONE)
printk(KERN_ERR "%s: write error (ac97_reg=%d GSR=%#lx)\n",
__FUNCTION__, reg, gsr_bits);
out: up(&car_mutex);
}
static void pxa2xx_ac97_reset(ac97_t *ac97)
{
/* First, try cold reset */
GCR &= GCR_COLD_RST; /* clear everything but nCRST */
GCR &= ~GCR_COLD_RST; /* then assert nCRST */
gsr_bits = 0;
#ifdef CONFIG_PXA27x
/* PXA27x Developers Manual section 13.5.2.2.1 */
pxa_set_cken(1 << 31, 1);
udelay(5);
pxa_set_cken(1 << 31, 0);
GCR = GCR_COLD_RST;
udelay(50);
#else
GCR = GCR_COLD_RST;
GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
#endif
if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR))) {
printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
__FUNCTION__, gsr_bits);
/* let's try warm reset */
gsr_bits = 0;
#ifdef CONFIG_PXA27x
/* warm reset broken on Bulverde,
so manually keep AC97 reset high */
pxa_gpio_mode(113 | GPIO_OUT | GPIO_DFLT_HIGH);
udelay(10);
GCR |= GCR_WARM_RST;
pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
udelay(50);
#else
GCR |= GCR_WARM_RST|GCR_PRIRDY_IEN|GCR_SECRDY_IEN;;
wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
#endif
if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
__FUNCTION__, gsr_bits);
}
GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
}
static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id, struct pt_regs *regs)
{
long status;
status = GSR;
if (status) {
GSR = status;
gsr_bits |= status;
wake_up(&gsr_wq);
#ifdef CONFIG_PXA27x
/* Although we don't use those we still need to clear them
since they tend to spuriously trigger when MMC is used
(hardware bug? go figure)... */
MISR = MISR_EOC;
PISR = PISR_EOC;
MCSR = MCSR_EOC;
#endif
return IRQ_HANDLED;
}
return IRQ_NONE;
}
static ac97_bus_ops_t pxa2xx_ac97_ops = {
.read = pxa2xx_ac97_read,
.write = pxa2xx_ac97_write,
.reset = pxa2xx_ac97_reset,
};
static pxa2xx_pcm_dma_params_t pxa2xx_ac97_pcm_out = {
.name = "AC97 PCM out",
.dev_addr = __PREG(PCDR),
.drcmr = &DRCMRTXPCDR,
.dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG |
DCMD_BURST32 | DCMD_WIDTH4,
};
static pxa2xx_pcm_dma_params_t pxa2xx_ac97_pcm_in = {
.name = "AC97 PCM in",
.dev_addr = __PREG(PCDR),
.drcmr = &DRCMRRXPCDR,
.dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC |
DCMD_BURST32 | DCMD_WIDTH4,
};
static snd_pcm_t *pxa2xx_ac97_pcm;
static ac97_t *pxa2xx_ac97_ac97;
static int pxa2xx_ac97_pcm_startup(snd_pcm_substream_t *substream)
{
snd_pcm_runtime_t *runtime = substream->runtime;
pxa2xx_audio_ops_t *platform_ops;
int r;
runtime->hw.channels_min = 2;
runtime->hw.channels_max = 2;
r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
runtime->hw.rates = pxa2xx_ac97_ac97->rates[r];
snd_pcm_limit_hw_rates(runtime);
platform_ops = substream->pcm->card->dev->platform_data;
if (platform_ops && platform_ops->startup)
return platform_ops->startup(substream, platform_ops->priv);
else
return 0;
}
static void pxa2xx_ac97_pcm_shutdown(snd_pcm_substream_t *substream)
{
pxa2xx_audio_ops_t *platform_ops;
platform_ops = substream->pcm->card->dev->platform_data;
if (platform_ops && platform_ops->shutdown)
platform_ops->shutdown(substream, platform_ops->priv);
}
static int pxa2xx_ac97_pcm_prepare(snd_pcm_substream_t *substream)
{
snd_pcm_runtime_t *runtime = substream->runtime;
int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
}
static pxa2xx_pcm_client_t pxa2xx_ac97_pcm_client = {
.playback_params = &pxa2xx_ac97_pcm_out,
.capture_params = &pxa2xx_ac97_pcm_in,
.startup = pxa2xx_ac97_pcm_startup,
.shutdown = pxa2xx_ac97_pcm_shutdown,
.prepare = pxa2xx_ac97_pcm_prepare,
};
#ifdef CONFIG_PM
static int pxa2xx_ac97_do_suspend(snd_card_t *card, unsigned int state)
{
if (card->power_state != SNDRV_CTL_POWER_D3cold) {
pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
snd_pcm_suspend_all(pxa2xx_ac97_pcm);
snd_ac97_suspend(pxa2xx_ac97_ac97);
snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
if (platform_ops && platform_ops->suspend)
platform_ops->suspend(platform_ops->priv);
GCR |= GCR_ACLINK_OFF;
pxa_set_cken(CKEN2_AC97, 0);
}
return 0;
}
static int pxa2xx_ac97_do_resume(snd_card_t *card, unsigned int state)
{
if (card->power_state != SNDRV_CTL_POWER_D0) {
pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
pxa_set_cken(CKEN2_AC97, 1);
if (platform_ops && platform_ops->resume)
platform_ops->resume(platform_ops->priv);
snd_ac97_resume(pxa2xx_ac97_ac97);
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
}
return 0;
}
static int pxa2xx_ac97_suspend(struct device *_dev, u32 state, u32 level)
{
snd_card_t *card = dev_get_drvdata(_dev);
int ret = 0;
if (card && level == SUSPEND_DISABLE)
ret = pxa2xx_ac97_do_suspend(card, SNDRV_CTL_POWER_D3cold);
return ret;
}
static int pxa2xx_ac97_resume(struct device *_dev, u32 level)
{
snd_card_t *card = dev_get_drvdata(_dev);
int ret = 0;
if (card && level == RESUME_ENABLE)
ret = pxa2xx_ac97_do_resume(card, SNDRV_CTL_POWER_D0);
return ret;
}
#else
#define pxa2xx_ac97_suspend NULL
#define pxa2xx_ac97_resume NULL
#endif
static int pxa2xx_ac97_probe(struct device *dev)
{
snd_card_t *card;
ac97_bus_t *ac97_bus;
ac97_template_t ac97_template;
int ret;
ret = -ENOMEM;
card = snd_card_new(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
THIS_MODULE, 0);
if (!card)
goto err;
card->dev = dev;
strncpy(card->driver, dev->driver->name, sizeof(card->driver));
ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm);
if (ret)
goto err;
ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, 0, "AC97", NULL);
if (ret < 0)
goto err;
pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
#ifdef CONFIG_PXA27x
/* Use GPIO 113 as AC97 Reset on Bulverde */
pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
#endif
pxa_set_cken(CKEN2_AC97, 1);
ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
if (ret)
goto err;
memset(&ac97_template, 0, sizeof(ac97_template));
ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
if (ret)
goto err;
snprintf(card->shortname, sizeof(card->shortname),
"%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
snprintf(card->longname, sizeof(card->longname),
"%s (%s)", dev->driver->name, card->mixername);
snd_card_set_pm_callback(card, pxa2xx_ac97_do_suspend,
pxa2xx_ac97_do_resume, NULL);
ret = snd_card_register(card);
if (ret == 0) {
dev_set_drvdata(dev, card);
return 0;
}
err:
if (card)
snd_card_free(card);
if (CKEN & CKEN2_AC97) {
GCR |= GCR_ACLINK_OFF;
free_irq(IRQ_AC97, NULL);
pxa_set_cken(CKEN2_AC97, 0);
}
return ret;
}
static int pxa2xx_ac97_remove(struct device *dev)
{
snd_card_t *card = dev_get_drvdata(dev);
if (card) {
snd_card_free(card);
dev_set_drvdata(dev, NULL);
GCR |= GCR_ACLINK_OFF;
free_irq(IRQ_AC97, NULL);
pxa_set_cken(CKEN2_AC97, 0);
}
return 0;
}
static struct device_driver pxa2xx_ac97_driver = {
.name = "pxa2xx-ac97",
.bus = &platform_bus_type,
.probe = pxa2xx_ac97_probe,
.remove = pxa2xx_ac97_remove,
.suspend = pxa2xx_ac97_suspend,
.resume = pxa2xx_ac97_resume,
};
static int __init pxa2xx_ac97_init(void)
{
return driver_register(&pxa2xx_ac97_driver);
}
static void __exit pxa2xx_ac97_exit(void)
{
driver_unregister(&pxa2xx_ac97_driver);
}
module_init(pxa2xx_ac97_init);
module_exit(pxa2xx_ac97_exit);
MODULE_AUTHOR("Nicolas Pitre");
MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
MODULE_LICENSE("GPL");

367
sound/arm/pxa2xx-pcm.c Normal file
View file

@ -0,0 +1,367 @@
/*
* linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
*
* Author: Nicolas Pitre
* Created: Nov 30, 2004
* Copyright: (C) 2004 MontaVista Software, Inc.
*
* 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/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <asm/dma.h>
#include <asm/hardware.h>
#include <asm/arch/pxa-regs.h>
#include "pxa2xx-pcm.h"
static const snd_pcm_hardware_t pxa2xx_pcm_hardware = {
.info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_PAUSE,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.period_bytes_min = 32,
.period_bytes_max = 8192 - 32,
.periods_min = 1,
.periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
.buffer_bytes_max = 128 * 1024,
.fifo_size = 32,
};
struct pxa2xx_runtime_data {
int dma_ch;
pxa2xx_pcm_dma_params_t *params;
pxa_dma_desc *dma_desc_array;
dma_addr_t dma_desc_array_phys;
};
static int pxa2xx_pcm_hw_params(snd_pcm_substream_t *substream,
snd_pcm_hw_params_t *params)
{
snd_pcm_runtime_t *runtime = substream->runtime;
struct pxa2xx_runtime_data *rtd = runtime->private_data;
size_t totsize = params_buffer_bytes(params);
size_t period = params_period_bytes(params);
pxa_dma_desc *dma_desc;
dma_addr_t dma_buff_phys, next_desc_phys;
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
runtime->dma_bytes = totsize;
dma_desc = rtd->dma_desc_array;
next_desc_phys = rtd->dma_desc_array_phys;
dma_buff_phys = runtime->dma_addr;
do {
next_desc_phys += sizeof(pxa_dma_desc);
dma_desc->ddadr = next_desc_phys;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
dma_desc->dsadr = dma_buff_phys;
dma_desc->dtadr = rtd->params->dev_addr;
} else {
dma_desc->dsadr = rtd->params->dev_addr;
dma_desc->dtadr = dma_buff_phys;
}
if (period > totsize)
period = totsize;
dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN;
dma_desc++;
dma_buff_phys += period;
} while (totsize -= period);
dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
return 0;
}
static int pxa2xx_pcm_hw_free(snd_pcm_substream_t *substream)
{
struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
*rtd->params->drcmr = 0;
snd_pcm_set_runtime_buffer(substream, NULL);
return 0;
}
static int pxa2xx_pcm_prepare(snd_pcm_substream_t *substream)
{
pxa2xx_pcm_client_t *client = substream->private_data;
snd_pcm_runtime_t *runtime = substream->runtime;
struct pxa2xx_runtime_data *rtd = runtime->private_data;
DCSR(rtd->dma_ch) &= ~DCSR_RUN;
DCSR(rtd->dma_ch) = 0;
DCMD(rtd->dma_ch) = 0;
*rtd->params->drcmr = rtd->dma_ch | DRCMR_MAPVLD;
return client->prepare(substream);
}
static int pxa2xx_pcm_trigger(snd_pcm_substream_t *substream, int cmd)
{
struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
int ret = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
DDADR(rtd->dma_ch) = rtd->dma_desc_array_phys;
DCSR(rtd->dma_ch) = DCSR_RUN;
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
DCSR(rtd->dma_ch) &= ~DCSR_RUN;
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
DCSR(rtd->dma_ch) |= DCSR_RUN;
break;
default:
ret = -EINVAL;
}
return ret;
}
static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id, struct pt_regs *regs)
{
snd_pcm_substream_t *substream = dev_id;
struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
int dcsr;
dcsr = DCSR(dma_ch);
DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
if (dcsr & DCSR_ENDINTR) {
snd_pcm_period_elapsed(substream);
} else {
printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
rtd->params->name, dma_ch, dcsr );
snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
}
}
static snd_pcm_uframes_t pxa2xx_pcm_pointer(snd_pcm_substream_t *substream)
{
snd_pcm_runtime_t *runtime = substream->runtime;
struct pxa2xx_runtime_data *rtd = runtime->private_data;
dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
DSADR(rtd->dma_ch) : DTADR(rtd->dma_ch);
snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
if (x == runtime->buffer_size)
x = 0;
return x;
}
static int
pxa2xx_pcm_hw_rule_mult32(snd_pcm_hw_params_t *params, snd_pcm_hw_rule_t *rule)
{
snd_interval_t *i = hw_param_interval(params, rule->var);
int changed = 0;
if (i->min & 31) {
i->min = (i->min & ~31) + 32;
i->openmin = 0;
changed = 1;
}
if (i->max & 31) {
i->max &= ~31;
i->openmax = 0;
changed = 1;
}
return changed;
}
static int pxa2xx_pcm_open(snd_pcm_substream_t *substream)
{
pxa2xx_pcm_client_t *client = substream->private_data;
snd_pcm_runtime_t *runtime = substream->runtime;
struct pxa2xx_runtime_data *rtd;
int ret;
runtime->hw = pxa2xx_pcm_hardware;
/*
* For mysterious reasons (and despite what the manual says)
* playback samples are lost if the DMA count is not a multiple
* of the DMA burst size. Let's add a rule to enforce that.
*/
ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
pxa2xx_pcm_hw_rule_mult32, NULL,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, -1);
if (ret)
goto out;
ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
pxa2xx_pcm_hw_rule_mult32, NULL,
SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
if (ret)
goto out;
ret = -ENOMEM;
rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
if (!rtd)
goto out;
rtd->dma_desc_array =
dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
&rtd->dma_desc_array_phys, GFP_KERNEL);
if (!rtd->dma_desc_array)
goto err1;
rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
client->playback_params : client->capture_params;
ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW,
pxa2xx_pcm_dma_irq, substream);
if (ret < 0)
goto err2;
rtd->dma_ch = ret;
runtime->private_data = rtd;
ret = client->startup(substream);
if (!ret)
goto out;
pxa_free_dma(rtd->dma_ch);
err2:
dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
rtd->dma_desc_array, rtd->dma_desc_array_phys);
err1:
kfree(rtd);
out:
return ret;
}
static int pxa2xx_pcm_close(snd_pcm_substream_t *substream)
{
pxa2xx_pcm_client_t *client = substream->private_data;
struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
pxa_free_dma(rtd->dma_ch);
client->shutdown(substream);
dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
rtd->dma_desc_array, rtd->dma_desc_array_phys);
kfree(rtd);
return 0;
}
static int
pxa2xx_pcm_mmap(snd_pcm_substream_t *substream, struct vm_area_struct *vma)
{
snd_pcm_runtime_t *runtime = substream->runtime;
return dma_mmap_writecombine(substream->pcm->card->dev, vma,
runtime->dma_area,
runtime->dma_addr,
runtime->dma_bytes);
}
static snd_pcm_ops_t pxa2xx_pcm_ops = {
.open = pxa2xx_pcm_open,
.close = pxa2xx_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = pxa2xx_pcm_hw_params,
.hw_free = pxa2xx_pcm_hw_free,
.prepare = pxa2xx_pcm_prepare,
.trigger = pxa2xx_pcm_trigger,
.pointer = pxa2xx_pcm_pointer,
.mmap = pxa2xx_pcm_mmap,
};
static int pxa2xx_pcm_preallocate_dma_buffer(snd_pcm_t *pcm, int stream)
{
snd_pcm_substream_t *substream = pcm->streams[stream].substream;
struct snd_dma_buffer *buf = &substream->dma_buffer;
size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
buf->dev.type = SNDRV_DMA_TYPE_DEV;
buf->dev.dev = pcm->card->dev;
buf->private_data = NULL;
buf->area = dma_alloc_writecombine(pcm->card->dev, size,
&buf->addr, GFP_KERNEL);
if (!buf->area)
return -ENOMEM;
buf->bytes = size;
return 0;
}
static void pxa2xx_pcm_free_dma_buffers(snd_pcm_t *pcm)
{
snd_pcm_substream_t *substream;
struct snd_dma_buffer *buf;
int stream;
for (stream = 0; stream < 2; stream++) {
substream = pcm->streams[stream].substream;
if (!substream)
continue;
buf = &substream->dma_buffer;
if (!buf->area)
continue;
dma_free_writecombine(pcm->card->dev, buf->bytes,
buf->area, buf->addr);
buf->area = NULL;
}
}
static u64 pxa2xx_pcm_dmamask = 0xffffffff;
int pxa2xx_pcm_new(snd_card_t *card, pxa2xx_pcm_client_t *client, snd_pcm_t **rpcm)
{
snd_pcm_t *pcm;
int play = client->playback_params ? 1 : 0;
int capt = client->capture_params ? 1 : 0;
int ret;
ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
if (ret)
goto out;
pcm->private_data = client;
pcm->private_free = pxa2xx_pcm_free_dma_buffers;
if (!card->dev->dma_mask)
card->dev->dma_mask = &pxa2xx_pcm_dmamask;
if (!card->dev->coherent_dma_mask)
card->dev->coherent_dma_mask = 0xffffffff;
if (play) {
int stream = SNDRV_PCM_STREAM_PLAYBACK;
snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
if (ret)
goto out;
}
if (capt) {
int stream = SNDRV_PCM_STREAM_CAPTURE;
snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
if (ret)
goto out;
}
if (rpcm)
*rpcm = pcm;
ret = 0;
out:
return ret;
}
EXPORT_SYMBOL(pxa2xx_pcm_new);
MODULE_AUTHOR("Nicolas Pitre");
MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
MODULE_LICENSE("GPL");

29
sound/arm/pxa2xx-pcm.h Normal file
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@ -0,0 +1,29 @@
/*
* linux/sound/arm/pxa2xx-pcm.h -- ALSA PCM interface for the Intel PXA2xx chip
*
* Author: Nicolas Pitre
* Created: Nov 30, 2004
* Copyright: MontaVista Software, Inc.
*
* 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.
*/
typedef struct {
char *name; /* stream identifier */
u32 dcmd; /* DMA descriptor dcmd field */
volatile u32 *drcmr; /* the DMA request channel to use */
u32 dev_addr; /* device physical address for DMA */
} pxa2xx_pcm_dma_params_t;
typedef struct {
pxa2xx_pcm_dma_params_t *playback_params;
pxa2xx_pcm_dma_params_t *capture_params;
int (*startup)(snd_pcm_substream_t *);
void (*shutdown)(snd_pcm_substream_t *);
int (*prepare)(snd_pcm_substream_t *);
} pxa2xx_pcm_client_t;
extern int pxa2xx_pcm_new(snd_card_t *, pxa2xx_pcm_client_t *, snd_pcm_t **);