linux/sound/soc/fsl/mpc8610_hpcd.c
Timur Tabi a454dad19e ASoC: add support for SSI asynchronous mode to the Freescale SSI drivers
Add a new device tree property for the SSI node: "fsl,ssi-asynchronous".  If
defined, the SSI is programmed into asynchronous mode, otherwise it is
programmed into synchronous mode.  In asynchronous mode, pin SRCK must be
connected to the same clock source as STFS, and pin SRFS must be connected to
the same signal as STFS.  Asynchronous mode allows playback and capture to
use different sample sizes.  It also technically allows different sample rates,
but the driver does not support that.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-03-06 13:37:16 +00:00

625 lines
18 KiB
C

/**
* Freescale MPC8610HPCD ALSA SoC Fabric driver
*
* Author: Timur Tabi <timur@freescale.com>
*
* Copyright 2007-2008 Freescale Semiconductor, Inc. This file is licensed
* under the terms of the GNU General Public License version 2. This
* program is licensed "as is" without any warranty of any kind, whether
* express or implied.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <sound/soc.h>
#include <asm/immap_86xx.h>
#include "../codecs/cs4270.h"
#include "fsl_dma.h"
#include "fsl_ssi.h"
/**
* mpc8610_hpcd_data: fabric-specific ASoC device data
*
* This structure contains data for a single sound platform device on an
* MPC8610 HPCD. Some of the data is taken from the device tree.
*/
struct mpc8610_hpcd_data {
struct snd_soc_device sound_devdata;
struct snd_soc_dai_link dai;
struct snd_soc_card machine;
unsigned int dai_format;
unsigned int codec_clk_direction;
unsigned int cpu_clk_direction;
unsigned int clk_frequency;
struct ccsr_guts __iomem *guts;
struct ccsr_ssi __iomem *ssi;
unsigned int ssi_id; /* 0 = SSI1, 1 = SSI2, etc */
unsigned int ssi_irq;
unsigned int dma_id; /* 0 = DMA1, 1 = DMA2, etc */
unsigned int dma_irq[2];
struct ccsr_dma_channel __iomem *dma[2];
unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
};
/**
* mpc8610_hpcd_machine_probe: initalize the board
*
* This function is called when platform_device_add() is called. It is used
* to initialize the board-specific hardware.
*
* Here we program the DMACR and PMUXCR registers.
*/
static int mpc8610_hpcd_machine_probe(struct platform_device *sound_device)
{
struct mpc8610_hpcd_data *machine_data =
sound_device->dev.platform_data;
/* Program the signal routing between the SSI and the DMA */
guts_set_dmacr(machine_data->guts, machine_data->dma_id,
machine_data->dma_channel_id[0], CCSR_GUTS_DMACR_DEV_SSI);
guts_set_dmacr(machine_data->guts, machine_data->dma_id,
machine_data->dma_channel_id[1], CCSR_GUTS_DMACR_DEV_SSI);
guts_set_pmuxcr_dma(machine_data->guts, machine_data->dma_id,
machine_data->dma_channel_id[0], 0);
guts_set_pmuxcr_dma(machine_data->guts, machine_data->dma_id,
machine_data->dma_channel_id[1], 0);
switch (machine_data->ssi_id) {
case 0:
clrsetbits_be32(&machine_data->guts->pmuxcr,
CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_SSI);
break;
case 1:
clrsetbits_be32(&machine_data->guts->pmuxcr,
CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_SSI);
break;
}
return 0;
}
/**
* mpc8610_hpcd_startup: program the board with various hardware parameters
*
* This function takes board-specific information, like clock frequencies
* and serial data formats, and passes that information to the codec and
* transport drivers.
*/
static int mpc8610_hpcd_startup(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
struct mpc8610_hpcd_data *machine_data =
rtd->socdev->dev->platform_data;
int ret = 0;
/* Tell the CPU driver what the serial protocol is. */
ret = snd_soc_dai_set_fmt(cpu_dai, machine_data->dai_format);
if (ret < 0) {
dev_err(substream->pcm->card->dev,
"could not set CPU driver audio format\n");
return ret;
}
/* Tell the codec driver what the serial protocol is. */
ret = snd_soc_dai_set_fmt(codec_dai, machine_data->dai_format);
if (ret < 0) {
dev_err(substream->pcm->card->dev,
"could not set codec driver audio format\n");
return ret;
}
/*
* Tell the CPU driver what the clock frequency is, and whether it's a
* slave or master.
*/
ret = snd_soc_dai_set_sysclk(cpu_dai, 0,
machine_data->clk_frequency,
machine_data->cpu_clk_direction);
if (ret < 0) {
dev_err(substream->pcm->card->dev,
"could not set CPU driver clock parameters\n");
return ret;
}
/*
* Tell the codec driver what the MCLK frequency is, and whether it's
* a slave or master.
*/
ret = snd_soc_dai_set_sysclk(codec_dai, 0,
machine_data->clk_frequency,
machine_data->codec_clk_direction);
if (ret < 0) {
dev_err(substream->pcm->card->dev,
"could not set codec driver clock params\n");
return ret;
}
return 0;
}
/**
* mpc8610_hpcd_machine_remove: Remove the sound device
*
* This function is called to remove the sound device for one SSI. We
* de-program the DMACR and PMUXCR register.
*/
int mpc8610_hpcd_machine_remove(struct platform_device *sound_device)
{
struct mpc8610_hpcd_data *machine_data =
sound_device->dev.platform_data;
/* Restore the signal routing */
guts_set_dmacr(machine_data->guts, machine_data->dma_id,
machine_data->dma_channel_id[0], 0);
guts_set_dmacr(machine_data->guts, machine_data->dma_id,
machine_data->dma_channel_id[1], 0);
switch (machine_data->ssi_id) {
case 0:
clrsetbits_be32(&machine_data->guts->pmuxcr,
CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_LA);
break;
case 1:
clrsetbits_be32(&machine_data->guts->pmuxcr,
CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_LA);
break;
}
return 0;
}
/**
* mpc8610_hpcd_ops: ASoC fabric driver operations
*/
static struct snd_soc_ops mpc8610_hpcd_ops = {
.startup = mpc8610_hpcd_startup,
};
/**
* mpc8610_hpcd_probe: OF probe function for the fabric driver
*
* This function gets called when an SSI node is found in the device tree.
*
* Although this is a fabric driver, the SSI node is the "master" node with
* respect to audio hardware connections. Therefore, we create a new ASoC
* device for each new SSI node that has a codec attached.
*
* FIXME: Currently, we only support one DMA controller, so if there are
* multiple SSI nodes with codecs, only the first will be supported.
*
* FIXME: Even if we did support multiple DMA controllers, we have no
* mechanism for assigning DMA controllers and channels to the individual
* SSI devices. We also probably aren't compatible with the generic Elo DMA
* device driver.
*/
static int mpc8610_hpcd_probe(struct of_device *ofdev,
const struct of_device_id *match)
{
struct device_node *np = ofdev->node;
struct device_node *codec_np = NULL;
struct device_node *guts_np = NULL;
struct device_node *dma_np = NULL;
struct device_node *dma_channel_np = NULL;
const phandle *codec_ph;
const char *sprop;
const u32 *iprop;
struct resource res;
struct platform_device *sound_device = NULL;
struct mpc8610_hpcd_data *machine_data;
struct fsl_ssi_info ssi_info;
struct fsl_dma_info dma_info;
int ret = -ENODEV;
unsigned int playback_dma_channel;
unsigned int capture_dma_channel;
machine_data = kzalloc(sizeof(struct mpc8610_hpcd_data), GFP_KERNEL);
if (!machine_data)
return -ENOMEM;
memset(&ssi_info, 0, sizeof(ssi_info));
memset(&dma_info, 0, sizeof(dma_info));
ssi_info.dev = &ofdev->dev;
/*
* We are only interested in SSIs with a codec phandle in them, so let's
* make sure this SSI has one.
*/
codec_ph = of_get_property(np, "codec-handle", NULL);
if (!codec_ph)
goto error;
codec_np = of_find_node_by_phandle(*codec_ph);
if (!codec_np)
goto error;
/* The MPC8610 HPCD only knows about the CS4270 codec, so reject
anything else. */
if (!of_device_is_compatible(codec_np, "cirrus,cs4270"))
goto error;
/* Get the device ID */
iprop = of_get_property(np, "cell-index", NULL);
if (!iprop) {
dev_err(&ofdev->dev, "cell-index property not found\n");
ret = -EINVAL;
goto error;
}
machine_data->ssi_id = *iprop;
ssi_info.id = *iprop;
/* Get the serial format and clock direction. */
sprop = of_get_property(np, "fsl,mode", NULL);
if (!sprop) {
dev_err(&ofdev->dev, "fsl,mode property not found\n");
ret = -EINVAL;
goto error;
}
if (strcasecmp(sprop, "i2s-slave") == 0) {
machine_data->dai_format = SND_SOC_DAIFMT_I2S;
machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
/*
* In i2s-slave mode, the codec has its own clock source, so we
* need to get the frequency from the device tree and pass it to
* the codec driver.
*/
iprop = of_get_property(codec_np, "clock-frequency", NULL);
if (!iprop || !*iprop) {
dev_err(&ofdev->dev, "codec bus-frequency property "
"is missing or invalid\n");
ret = -EINVAL;
goto error;
}
machine_data->clk_frequency = *iprop;
} else if (strcasecmp(sprop, "i2s-master") == 0) {
machine_data->dai_format = SND_SOC_DAIFMT_I2S;
machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
} else if (strcasecmp(sprop, "lj-slave") == 0) {
machine_data->dai_format = SND_SOC_DAIFMT_LEFT_J;
machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
} else if (strcasecmp(sprop, "lj-master") == 0) {
machine_data->dai_format = SND_SOC_DAIFMT_LEFT_J;
machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
} else if (strcasecmp(sprop, "rj-slave") == 0) {
machine_data->dai_format = SND_SOC_DAIFMT_RIGHT_J;
machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
} else if (strcasecmp(sprop, "rj-master") == 0) {
machine_data->dai_format = SND_SOC_DAIFMT_RIGHT_J;
machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
} else if (strcasecmp(sprop, "ac97-slave") == 0) {
machine_data->dai_format = SND_SOC_DAIFMT_AC97;
machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
} else if (strcasecmp(sprop, "ac97-master") == 0) {
machine_data->dai_format = SND_SOC_DAIFMT_AC97;
machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
} else {
dev_err(&ofdev->dev,
"unrecognized fsl,mode property \"%s\"\n", sprop);
ret = -EINVAL;
goto error;
}
if (!machine_data->clk_frequency) {
dev_err(&ofdev->dev, "unknown clock frequency\n");
ret = -EINVAL;
goto error;
}
/* Read the SSI information from the device tree */
ret = of_address_to_resource(np, 0, &res);
if (ret) {
dev_err(&ofdev->dev, "could not obtain SSI address\n");
goto error;
}
if (!res.start) {
dev_err(&ofdev->dev, "invalid SSI address\n");
goto error;
}
ssi_info.ssi_phys = res.start;
machine_data->ssi = ioremap(ssi_info.ssi_phys, sizeof(struct ccsr_ssi));
if (!machine_data->ssi) {
dev_err(&ofdev->dev, "could not map SSI address %x\n",
ssi_info.ssi_phys);
ret = -EINVAL;
goto error;
}
ssi_info.ssi = machine_data->ssi;
/* Get the IRQ of the SSI */
machine_data->ssi_irq = irq_of_parse_and_map(np, 0);
if (!machine_data->ssi_irq) {
dev_err(&ofdev->dev, "could not get SSI IRQ\n");
ret = -EINVAL;
goto error;
}
ssi_info.irq = machine_data->ssi_irq;
/* Do we want to use asynchronous mode? */
ssi_info.asynchronous =
of_find_property(np, "fsl,ssi-asynchronous", NULL) ? 1 : 0;
if (ssi_info.asynchronous)
dev_info(&ofdev->dev, "using asynchronous mode\n");
/* Map the global utilities registers. */
guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");
if (!guts_np) {
dev_err(&ofdev->dev, "could not obtain address of GUTS\n");
ret = -EINVAL;
goto error;
}
machine_data->guts = of_iomap(guts_np, 0);
of_node_put(guts_np);
if (!machine_data->guts) {
dev_err(&ofdev->dev, "could not map GUTS\n");
ret = -EINVAL;
goto error;
}
/* Find the DMA channels to use. Both SSIs need to use the same DMA
* controller, so let's use DMA#1.
*/
for_each_compatible_node(dma_np, NULL, "fsl,mpc8610-dma") {
iprop = of_get_property(dma_np, "cell-index", NULL);
if (iprop && (*iprop == 0)) {
of_node_put(dma_np);
break;
}
}
if (!dma_np) {
dev_err(&ofdev->dev, "could not find DMA node\n");
ret = -EINVAL;
goto error;
}
machine_data->dma_id = *iprop;
/* SSI1 needs to use DMA Channels 0 and 1, and SSI2 needs to use DMA
* channels 2 and 3. This is just how the MPC8610 is wired
* internally.
*/
playback_dma_channel = (machine_data->ssi_id == 0) ? 0 : 2;
capture_dma_channel = (machine_data->ssi_id == 0) ? 1 : 3;
/*
* Find the DMA channels to use.
*/
while ((dma_channel_np = of_get_next_child(dma_np, dma_channel_np))) {
iprop = of_get_property(dma_channel_np, "cell-index", NULL);
if (iprop && (*iprop == playback_dma_channel)) {
/* dma_channel[0] and dma_irq[0] are for playback */
dma_info.dma_channel[0] = of_iomap(dma_channel_np, 0);
dma_info.dma_irq[0] =
irq_of_parse_and_map(dma_channel_np, 0);
machine_data->dma_channel_id[0] = *iprop;
continue;
}
if (iprop && (*iprop == capture_dma_channel)) {
/* dma_channel[1] and dma_irq[1] are for capture */
dma_info.dma_channel[1] = of_iomap(dma_channel_np, 0);
dma_info.dma_irq[1] =
irq_of_parse_and_map(dma_channel_np, 0);
machine_data->dma_channel_id[1] = *iprop;
continue;
}
}
if (!dma_info.dma_channel[0] || !dma_info.dma_channel[1] ||
!dma_info.dma_irq[0] || !dma_info.dma_irq[1]) {
dev_err(&ofdev->dev, "could not find DMA channels\n");
ret = -EINVAL;
goto error;
}
dma_info.ssi_stx_phys = ssi_info.ssi_phys +
offsetof(struct ccsr_ssi, stx0);
dma_info.ssi_srx_phys = ssi_info.ssi_phys +
offsetof(struct ccsr_ssi, srx0);
/* We have the DMA information, so tell the DMA driver what it is */
if (!fsl_dma_configure(&dma_info)) {
dev_err(&ofdev->dev, "could not instantiate DMA device\n");
ret = -EBUSY;
goto error;
}
/*
* Initialize our DAI data structure. We should probably get this
* information from the device tree.
*/
machine_data->dai.name = "CS4270";
machine_data->dai.stream_name = "CS4270";
machine_data->dai.cpu_dai = fsl_ssi_create_dai(&ssi_info);
machine_data->dai.codec_dai = &cs4270_dai; /* The codec_dai we want */
machine_data->dai.ops = &mpc8610_hpcd_ops;
machine_data->machine.probe = mpc8610_hpcd_machine_probe;
machine_data->machine.remove = mpc8610_hpcd_machine_remove;
machine_data->machine.name = "MPC8610 HPCD";
machine_data->machine.num_links = 1;
machine_data->machine.dai_link = &machine_data->dai;
/* Allocate a new audio platform device structure */
sound_device = platform_device_alloc("soc-audio", -1);
if (!sound_device) {
dev_err(&ofdev->dev, "platform device allocation failed\n");
ret = -ENOMEM;
goto error;
}
machine_data->sound_devdata.card = &machine_data->machine;
machine_data->sound_devdata.codec_dev = &soc_codec_device_cs4270;
machine_data->machine.platform = &fsl_soc_platform;
sound_device->dev.platform_data = machine_data;
/* Set the platform device and ASoC device to point to each other */
platform_set_drvdata(sound_device, &machine_data->sound_devdata);
machine_data->sound_devdata.dev = &sound_device->dev;
/* Tell ASoC to probe us. This will call mpc8610_hpcd_machine.probe(),
if it exists. */
ret = platform_device_add(sound_device);
if (ret) {
dev_err(&ofdev->dev, "platform device add failed\n");
goto error;
}
dev_set_drvdata(&ofdev->dev, sound_device);
return 0;
error:
of_node_put(codec_np);
of_node_put(guts_np);
of_node_put(dma_np);
of_node_put(dma_channel_np);
if (sound_device)
platform_device_unregister(sound_device);
if (machine_data->dai.cpu_dai)
fsl_ssi_destroy_dai(machine_data->dai.cpu_dai);
if (ssi_info.ssi)
iounmap(ssi_info.ssi);
if (ssi_info.irq)
irq_dispose_mapping(ssi_info.irq);
if (dma_info.dma_channel[0])
iounmap(dma_info.dma_channel[0]);
if (dma_info.dma_channel[1])
iounmap(dma_info.dma_channel[1]);
if (dma_info.dma_irq[0])
irq_dispose_mapping(dma_info.dma_irq[0]);
if (dma_info.dma_irq[1])
irq_dispose_mapping(dma_info.dma_irq[1]);
if (machine_data->guts)
iounmap(machine_data->guts);
kfree(machine_data);
return ret;
}
/**
* mpc8610_hpcd_remove: remove the OF device
*
* This function is called when the OF device is removed.
*/
static int mpc8610_hpcd_remove(struct of_device *ofdev)
{
struct platform_device *sound_device = dev_get_drvdata(&ofdev->dev);
struct mpc8610_hpcd_data *machine_data =
sound_device->dev.platform_data;
platform_device_unregister(sound_device);
if (machine_data->dai.cpu_dai)
fsl_ssi_destroy_dai(machine_data->dai.cpu_dai);
if (machine_data->ssi)
iounmap(machine_data->ssi);
if (machine_data->dma[0])
iounmap(machine_data->dma[0]);
if (machine_data->dma[1])
iounmap(machine_data->dma[1]);
if (machine_data->dma_irq[0])
irq_dispose_mapping(machine_data->dma_irq[0]);
if (machine_data->dma_irq[1])
irq_dispose_mapping(machine_data->dma_irq[1]);
if (machine_data->guts)
iounmap(machine_data->guts);
kfree(machine_data);
sound_device->dev.platform_data = NULL;
dev_set_drvdata(&ofdev->dev, NULL);
return 0;
}
static struct of_device_id mpc8610_hpcd_match[] = {
{
.compatible = "fsl,mpc8610-ssi",
},
{}
};
MODULE_DEVICE_TABLE(of, mpc8610_hpcd_match);
static struct of_platform_driver mpc8610_hpcd_of_driver = {
.owner = THIS_MODULE,
.name = "mpc8610_hpcd",
.match_table = mpc8610_hpcd_match,
.probe = mpc8610_hpcd_probe,
.remove = mpc8610_hpcd_remove,
};
/**
* mpc8610_hpcd_init: fabric driver initialization.
*
* This function is called when this module is loaded.
*/
static int __init mpc8610_hpcd_init(void)
{
int ret;
printk(KERN_INFO "Freescale MPC8610 HPCD ALSA SoC fabric driver\n");
ret = of_register_platform_driver(&mpc8610_hpcd_of_driver);
if (ret)
printk(KERN_ERR
"mpc8610-hpcd: failed to register platform driver\n");
return ret;
}
/**
* mpc8610_hpcd_exit: fabric driver exit
*
* This function is called when this driver is unloaded.
*/
static void __exit mpc8610_hpcd_exit(void)
{
of_unregister_platform_driver(&mpc8610_hpcd_of_driver);
}
module_init(mpc8610_hpcd_init);
module_exit(mpc8610_hpcd_exit);
MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
MODULE_DESCRIPTION("Freescale MPC8610 HPCD ALSA SoC fabric driver");
MODULE_LICENSE("GPL");