- 根目录:
- sound
- soc
- fsl
- mpc8610_hpcd.c
/**
* Freescale MPC8610HPCD ALSA SoC Machine driver
*
* Author: Timur Tabi <timur@freescale.com>
*
* Copyright 2007-2010 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/slab.h>
#include <linux/of_i2c.h>
#include <sound/soc.h>
#include <asm/fsl_guts.h>
#include "fsl_dma.h"
#include "fsl_ssi.h"
/* There's only one global utilities register */
static phys_addr_t guts_phys;
#define DAI_NAME_SIZE 32
/**
* mpc8610_hpcd_data: machine-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_dai_link dai[2];
struct snd_soc_card card;
unsigned int dai_format;
unsigned int codec_clk_direction;
unsigned int cpu_clk_direction;
unsigned int clk_frequency;
unsigned int ssi_id; /* 0 = SSI1, 1 = SSI2, etc */
unsigned int dma_id[2]; /* 0 = DMA1, 1 = DMA2, etc */
unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
char codec_dai_name[DAI_NAME_SIZE];
char codec_name[DAI_NAME_SIZE];
char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
};
/**
* mpc8610_hpcd_machine_probe: initialize the board
*
* This function is used to initialize the board-specific hardware.
*
* Here we program the DMACR and PMUXCR registers.
*/
static int mpc8610_hpcd_machine_probe(struct snd_soc_card *card)
{
struct mpc8610_hpcd_data *machine_data =
container_of(card, struct mpc8610_hpcd_data, card);
struct ccsr_guts __iomem *guts;
guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
if (!guts) {
dev_err(card->dev, "could not map global utilities\n");
return -ENOMEM;
}
/* Program the signal routing between the SSI and the DMA */
guts_set_dmacr(guts, machine_data->dma_id[0],
machine_data->dma_channel_id[0],
CCSR_GUTS_DMACR_DEV_SSI);
guts_set_dmacr(guts, machine_data->dma_id[1],
machine_data->dma_channel_id[1],
CCSR_GUTS_DMACR_DEV_SSI);
guts_set_pmuxcr_dma(guts, machine_data->dma_id[0],
machine_data->dma_channel_id[0], 0);
guts_set_pmuxcr_dma(guts, machine_data->dma_id[1],
machine_data->dma_channel_id[1], 0);
switch (machine_data->ssi_id) {
case 0:
clrsetbits_be32(&guts->pmuxcr,
CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_SSI);
break;
case 1:
clrsetbits_be32(&guts->pmuxcr,
CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_SSI);
break;
}
iounmap(guts);
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 mpc8610_hpcd_data *machine_data =
container_of(rtd->card, struct mpc8610_hpcd_data, card);
struct device *dev = rtd->card->dev;
int ret = 0;
/* Tell the codec driver what the serial protocol is. */
ret = snd_soc_dai_set_fmt(rtd->codec_dai, machine_data->dai_format);
if (ret < 0) {
dev_err(dev, "could not set codec driver audio format\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(rtd->codec_dai, 0,
machine_data->clk_frequency,
machine_data->codec_clk_direction);
if (ret < 0) {
dev_err(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.
*/
static int mpc8610_hpcd_machine_remove(struct snd_soc_card *card)
{
struct mpc8610_hpcd_data *machine_data =
container_of(card, struct mpc8610_hpcd_data, card);
struct ccsr_guts __iomem *guts;
guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
if (!guts) {
dev_err(card->dev, "could not map global utilities\n");
return -ENOMEM;
}
/* Restore the signal routing */
guts_set_dmacr(guts, machine_data->dma_id[0],
machine_data->dma_channel_id[0], 0);
guts_set_dmacr(guts, machine_data->dma_id[1],
machine_data->dma_channel_id[1], 0);
switch (machine_data->ssi_id) {
case 0:
clrsetbits_be32(&guts->pmuxcr,
CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_LA);
break;
case 1:
clrsetbits_be32(&guts->pmuxcr,
CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_LA);
break;
}
iounmap(guts);
return 0;
}
/**
* mpc8610_hpcd_ops: ASoC machine driver operations
*/
static struct snd_soc_ops mpc8610_hpcd_ops = {
.startup = mpc8610_hpcd_startup,
};
/**
* get_node_by_phandle_name - get a node by its phandle name
*
* This function takes a node, the name of a property in that node, and a
* compatible string. Assuming the property is a phandle to another node,
* it returns that node, (optionally) if that node is compatible.
*
* If the property is not a phandle, or the node it points to is not compatible
* with the specific string, then NULL is returned.
*/
static struct device_node *get_node_by_phandle_name(struct device_node *np,
const char *name,
const char *compatible)
{
const phandle *ph;
int len;
ph = of_get_property(np, name, &len);
if (!ph || (len != sizeof(phandle)))
return NULL;
np = of_find_node_by_phandle(*ph);
if (!np)
return NULL;
if (compatible && !of_device_is_compatible(np, compatible)) {
of_node_put(np);
return NULL;
}
return np;
}
/**
* get_parent_cell_index -- return the cell-index of the parent of a node
*
* Return the value of the cell-index property of the parent of the given
* node. This is used for DMA channel nodes that need to know the DMA ID
* of the controller they are on.
*/
static int get_parent_cell_index(struct device_node *np)
{
struct device_node *parent = of_get_parent(np);
const u32 *iprop;
if (!parent)
return -1;
iprop = of_get_property(parent, "cell-index", NULL);
of_node_put(parent);
if (!iprop)
return -1;
return be32_to_cpup(iprop);
}
/**
* codec_node_dev_name - determine the dev_name for a codec node
*
* This function determines the dev_name for an I2C node. This is the name
* that would be returned by dev_name() if this device_node were part of a
* 'struct device' It's ugly and hackish, but it works.
*
* The dev_name for such devices include the bus number and I2C address. For
* example, "cs4270.0-004f".
*/
static int codec_node_dev_name(struct device_node *np, char *buf, size_t len)
{
const u32 *iprop;
int addr;
char temp[DAI_NAME_SIZE];
struct i2c_client *i2c;
of_modalias_node(np, temp, DAI_NAME_SIZE);
iprop = of_get_property(np, "reg", NULL);
if (!iprop)
return -EINVAL;
addr = be32_to_cpup(iprop);
/* We need the adapter number */
i2c = of_find_i2c_device_by_node(np);
if (!i2c)
return -ENODEV;
snprintf(buf, len, "%s.%u-%04x", temp, i2c->adapter->nr, addr);
return 0;
}
static int get_dma_channel(struct device_node *ssi_np,
const char *name,
struct snd_soc_dai_link *dai,
unsigned int *dma_channel_id,
unsigned int *dma_id)
{
struct resource res;
struct device_node *dma_channel_np;
const u32 *iprop;
int ret;
dma_channel_np = get_node_by_phandle_name(ssi_np, name,
"fsl,ssi-dma-channel");
if (!dma_channel_np)
return -EINVAL;
/* Determine the dev_name for the device_node. This code mimics the
* behavior of of_device_make_bus_id(). We need this because ASoC uses
* the dev_name() of the device to match the platform (DMA) device with
* the CPU (SSI) device. It's all ugly and hackish, but it works (for
* now).
*
* dai->platform name should already point to an allocated buffer.
*/
ret = of_address_to_resource(dma_channel_np, 0, &res);
if (ret)
return ret;
snprintf((char *)dai->platform_name, DAI_NAME_SIZE, "%llx.%s",
(unsigned long long) res.start, dma_channel_np->name);
iprop = of_get_property(dma_channel_np, "cell-index", NULL);
if (!iprop) {
of_node_put(dma_channel_np);
return -EINVAL;
}
*dma_channel_id = be32_to_cpup(iprop);
*dma_id = get_parent_cell_index(dma_channel_np);
of_node_put(dma_channel_np);
return 0;
}
/**
* mpc8610_hpcd_probe: platform probe function for the machine driver
*
* Although this is a machine 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.
*/
static int mpc8610_hpcd_probe(struct platform_device *pdev)
{
struct device *dev = pdev->dev.parent;
/* ssi_pdev is the platform device for the SSI node that probed us */
struct platform_device *ssi_pdev =
container_of(dev, struct platform_device, dev);
struct device_node *np = ssi_pdev->dev.of_node;
struct device_node *codec_np = NULL;
struct platform_device *sound_device = NULL;
struct mpc8610_hpcd_data *machine_data;
int ret = -ENODEV;
const char *sprop;
const u32 *iprop;
/* Find the codec node for this SSI. */
codec_np = of_parse_phandle(np, "codec-handle", 0);
if (!codec_np) {
dev_err(dev, "invalid codec node\n");
return -EINVAL;
}
machine_data = kzalloc(sizeof(struct mpc8610_hpcd_data), GFP_KERNEL);
if (!machine_data) {
ret = -ENOMEM;
goto error_alloc;
}
machine_data->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
machine_data->dai[0].ops = &mpc8610_hpcd_ops;
/* Determine the codec name, it will be used as the codec DAI name */
ret = codec_node_dev_name(codec_np, machine_data->codec_name,
DAI_NAME_SIZE);
if (ret) {
dev_err(&pdev->dev, "invalid codec node %s\n",
codec_np->full_name);
ret = -EINVAL;
goto error;
}
machine_data->dai[0].codec_name = machine_data->codec_name;
/* The DAI name from the codec (snd_soc_dai_driver.name) */
machine_data->dai[0].codec_dai_name = "cs4270-hifi";
/* We register two DAIs per SSI, one for playback and the other for
* capture. Currently, we only support codecs that have one DAI for
* both playback and capture.
*/
memcpy(&machine_data->dai[1], &machine_data->dai[0],
sizeof(struct snd_soc_dai_link));
/* Get the device ID */
iprop = of_get_property(np, "cell-index", NULL);
if (!iprop) {
dev_err(&pdev->dev, "cell-index property not found\n");
ret = -EINVAL;
goto error;
}
machine_data->ssi_id = be32_to_cpup(iprop);
/* Get the serial format and clock direction. */
sprop = of_get_property(np, "fsl,mode", NULL);
if (!sprop) {
dev_err(&pdev->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 | SND_SOC_DAIFMT_CBM_CFM;
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(&pdev->dev, "codec bus-frequency "
"property is missing or invalid\n");
ret = -EINVAL;
goto error;
}
machine_data->clk_frequency = be32_to_cpup(iprop);
} else if (strcasecmp(sprop, "i2s-master") == 0) {
machine_data->dai_format =
SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS;
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 | SND_SOC_DAIFMT_CBM_CFM;
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 | SND_SOC_DAIFMT_CBS_CFS;
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 | SND_SOC_DAIFMT_CBM_CFM;
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 | SND_SOC_DAIFMT_CBS_CFS;
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 | SND_SOC_DAIFMT_CBM_CFM;
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 | SND_SOC_DAIFMT_CBS_CFS;
machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
} else {
dev_err(&pdev->dev,
"unrecognized fsl,mode property '%s'\n", sprop);
ret = -EINVAL;
goto error;
}
if (!machine_data->clk_frequency) {
dev_err(&pdev->dev, "unknown clock frequency\n");
ret = -EINVAL;
goto error;
}
/* Find the playback DMA channel to use. */
machine_data->dai[0].platform_name = machine_data->platform_name[0];
ret = get_dma_channel(np, "fsl,playback-dma", &machine_data->dai[0],
&machine_data->dma_channel_id[0],
&machine_data->dma_id[0]);
if (ret) {
dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
goto error;
}
/* Find the capture DMA channel to use. */
machine_data->dai[1].platform_name = machine_data->platform_name[1];
ret = get_dma_channel(np, "fsl,capture-dma", &machine_data->dai[1],
&machine_data->dma_channel_id[1],
&machine_data->dma_id[1]);
if (ret) {
dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
goto error;
}
/* Initialize our DAI data structure. */
machine_data->dai[0].stream_name = "playback";
machine_data->dai[1].stream_name = "capture";
machine_data->dai[0].name = machine_data->dai[0].stream_name;
machine_data->dai[1].name = machine_data->dai[1].stream_name;
machine_data->card.probe = mpc8610_hpcd_machine_probe;
machine_data->card.remove = mpc8610_hpcd_machine_remove;
machine_data->card.name = pdev->name; /* The platform driver name */
machine_data->card.num_links = 2;
machine_data->card.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(&pdev->dev, "platform device alloc failed\n");
ret = -ENOMEM;
goto error;
}
/* Associate the card data with the sound device */
platform_set_drvdata(sound_device, &machine_data->card);
/* Register with ASoC */
ret = platform_device_add(sound_device);
if (ret) {
dev_err(&pdev->dev, "platform device add failed\n");
goto error_sound;
}
dev_set_drvdata(&pdev->dev, sound_device);
of_node_put(codec_np);
return 0;
error_sound:
platform_device_put(sound_device);
error:
kfree(machine_data);
error_alloc:
of_node_put(codec_np);
return ret;
}
/**
* mpc8610_hpcd_remove: remove the platform device
*
* This function is called when the platform device is removed.
*/
static int __devexit mpc8610_hpcd_remove(struct platform_device *pdev)
{
struct platform_device *sound_device = dev_get_drvdata(&pdev->dev);
struct snd_soc_card *card = platform_get_drvdata(sound_device);
struct mpc8610_hpcd_data *machine_data =
container_of(card, struct mpc8610_hpcd_data, card);
platform_device_unregister(sound_device);
kfree(machine_data);
sound_device->dev.platform_data = NULL;
dev_set_drvdata(&pdev->dev, NULL);
return 0;
}
static struct platform_driver mpc8610_hpcd_driver = {
.probe = mpc8610_hpcd_probe,
.remove = __devexit_p(mpc8610_hpcd_remove),
.driver = {
/* The name must match 'compatible' property in the device tree,
* in lowercase letters.
*/
.name = "snd-soc-mpc8610hpcd",
.owner = THIS_MODULE,
},
};
/**
* mpc8610_hpcd_init: machine driver initialization.
*
* This function is called when this module is loaded.
*/
static int __init mpc8610_hpcd_init(void)
{
struct device_node *guts_np;
struct resource res;
pr_info("Freescale MPC8610 HPCD ALSA SoC machine driver\n");
/* Get the physical address of the global utilities registers */
guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");
if (of_address_to_resource(guts_np, 0, &res)) {
pr_err("mpc8610-hpcd: missing/invalid global utilities node\n");
return -EINVAL;
}
guts_phys = res.start;
return platform_driver_register(&mpc8610_hpcd_driver);
}
/**
* mpc8610_hpcd_exit: machine driver exit
*
* This function is called when this driver is unloaded.
*/
static void __exit mpc8610_hpcd_exit(void)
{
platform_driver_unregister(&mpc8610_hpcd_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 machine driver");
MODULE_LICENSE("GPL v2");