/**
* 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/slab.h>
#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");
