/**
* Freescale P1022RDK ALSA SoC Machine driver
*
* Author: Timur Tabi <timur@freescale.com>
*
* Copyright 2012 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.
*
* Note: in order for audio to work correctly, the output controls need
* to be enabled, because they control the clock. So for playback, for
* example:
*
* amixer sset 'Left Output Mixer PCM' on
* amixer sset 'Right Output Mixer PCM' on
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/slab.h>
#include <sound/soc.h>
#include <asm/fsl_guts.h>
#include "fsl_dma.h"
#include "fsl_ssi.h"
#include "fsl_utils.h"
/* P1022-specific PMUXCR and DMUXCR bit definitions */
#define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK 0x0001c000
#define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI 0x00010000
#define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI 0x00018000
#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK 0x00000c00
#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI 0x00000000
#define CCSR_GUTS_DMUXCR_PAD 1 /* DMA controller/channel set to pad */
#define CCSR_GUTS_DMUXCR_SSI 2 /* DMA controller/channel set to SSI */
/*
* Set the DMACR register in the GUTS
*
* The DMACR register determines the source of initiated transfers for each
* channel on each DMA controller. Rather than have a bunch of repetitive
* macros for the bit patterns, we just have a function that calculates
* them.
*
* guts: Pointer to GUTS structure
* co: The DMA controller (0 or 1)
* ch: The channel on the DMA controller (0, 1, 2, or 3)
* device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
*/
static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
unsigned int co, unsigned int ch, unsigned int device)
{
unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
}
/* There's only one global utilities register */
static phys_addr_t guts_phys;
/**
* machine_data: machine-specific ASoC device data
*
* This structure contains data for a single sound platform device on an
* P1022 RDK. Some of the data is taken from the device tree.
*/
struct machine_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 dma_id[2]; /* 0 = DMA1, 1 = DMA2, etc */
unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
};
/**
* p1022_rdk_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 p1022_rdk_machine_probe(struct snd_soc_card *card)
{
struct machine_data *mdata =
container_of(card, struct machine_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;
}
/* Enable SSI Tx signal */
clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
/* Enable SSI Rx signal */
clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);
/* Enable DMA Channel for SSI */
guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
CCSR_GUTS_DMUXCR_SSI);
guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
CCSR_GUTS_DMUXCR_SSI);
iounmap(guts);
return 0;
}
/**
* p1022_rdk_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 p1022_rdk_startup(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct machine_data *mdata =
container_of(rtd->card, struct machine_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, mdata->dai_format);
if (ret < 0) {
dev_err(dev, "could not set codec driver audio format (ret=%i)\n",
ret);
return ret;
}
ret = snd_soc_dai_set_pll(rtd->codec_dai, 0, 0, mdata->clk_frequency,
mdata->clk_frequency);
if (ret < 0) {
dev_err(dev, "could not set codec PLL frequency (ret=%i)\n",
ret);
return ret;
}
return 0;
}
/**
* p1022_rdk_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 p1022_rdk_machine_remove(struct snd_soc_card *card)
{
struct machine_data *mdata =
container_of(card, struct machine_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 */
clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);
iounmap(guts);
return 0;
}
/**
* p1022_rdk_ops: ASoC machine driver operations
*/
static struct snd_soc_ops p1022_rdk_ops = {
.startup = p1022_rdk_startup,
};
/**
* p1022_rdk_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 p1022_rdk_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 machine_data *mdata;
const u32 *iprop;
int ret;
/* Find the codec node for this SSI. */
codec_np = of_parse_phandle(np, "codec-handle", 0);
if (!codec_np) {
dev_err(dev, "could not find codec node\n");
return -EINVAL;
}
mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
if (!mdata) {
ret = -ENOMEM;
goto error_put;
}
mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
mdata->dai[0].ops = &p1022_rdk_ops;
/* ASoC core can match codec with device node */
mdata->dai[0].codec_of_node = codec_np;
/*
* We register two DAIs per SSI, one for playback and the other for
* capture. We support codecs that have separate DAIs for both playback
* and capture.
*/
memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
/* The DAI names from the codec (snd_soc_dai_driver.name) */
mdata->dai[0].codec_dai_name = "wm8960-hifi";
mdata->dai[1].codec_dai_name = mdata->dai[0].codec_dai_name;
/*
* Configure the SSI for I2S slave mode. Older device trees have
* an fsl,mode property, but we ignore that since there's really
* only one way to configure the SSI.
*/
mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
mdata->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;
}
mdata->clk_frequency = be32_to_cpup(iprop);
if (!mdata->clk_frequency) {
dev_err(&pdev->dev, "unknown clock frequency\n");
ret = -EINVAL;
goto error;
}
/* Find the playback DMA channel to use. */
mdata->dai[0].platform_name = mdata->platform_name[0];
ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
&mdata->dma_channel_id[0],
&mdata->dma_id[0]);
if (ret) {
dev_err(&pdev->dev, "missing/invalid playback DMA phandle (ret=%i)\n",
ret);
goto error;
}
/* Find the capture DMA channel to use. */
mdata->dai[1].platform_name = mdata->platform_name[1];
ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
&mdata->dma_channel_id[1],
&mdata->dma_id[1]);
if (ret) {
dev_err(&pdev->dev, "missing/invalid capture DMA phandle (ret=%i)\n",
ret);
goto error;
}
/* Initialize our DAI data structure. */
mdata->dai[0].stream_name = "playback";
mdata->dai[1].stream_name = "capture";
mdata->dai[0].name = mdata->dai[0].stream_name;
mdata->dai[1].name = mdata->dai[1].stream_name;
mdata->card.probe = p1022_rdk_machine_probe;
mdata->card.remove = p1022_rdk_machine_remove;
mdata->card.name = pdev->name; /* The platform driver name */
mdata->card.owner = THIS_MODULE;
mdata->card.dev = &pdev->dev;
mdata->card.num_links = 2;
mdata->card.dai_link = mdata->dai;
/* Register with ASoC */
ret = snd_soc_register_card(&mdata->card);
if (ret) {
dev_err(&pdev->dev, "could not register card (ret=%i)\n", ret);
goto error;
}
return 0;
error:
kfree(mdata);
error_put:
of_node_put(codec_np);
return ret;
}
/**
* p1022_rdk_remove: remove the platform device
*
* This function is called when the platform device is removed.
*/
static int p1022_rdk_remove(struct platform_device *pdev)
{
struct snd_soc_card *card = platform_get_drvdata(pdev);
struct machine_data *mdata =
container_of(card, struct machine_data, card);
snd_soc_unregister_card(card);
kfree(mdata);
return 0;
}
static struct platform_driver p1022_rdk_driver = {
.probe = p1022_rdk_probe,
.remove = p1022_rdk_remove,
.driver = {
/*
* The name must match 'compatible' property in the device tree,
* in lowercase letters.
*/
.name = "snd-soc-p1022rdk",
.owner = THIS_MODULE,
},
};
/**
* p1022_rdk_init: machine driver initialization.
*
* This function is called when this module is loaded.
*/
static int __init p1022_rdk_init(void)
{
struct device_node *guts_np;
struct resource res;
/* Get the physical address of the global utilities registers */
guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
if (of_address_to_resource(guts_np, 0, &res)) {
pr_err("snd-soc-p1022rdk: missing/invalid global utils node\n");
of_node_put(guts_np);
return -EINVAL;
}
guts_phys = res.start;
of_node_put(guts_np);
return platform_driver_register(&p1022_rdk_driver);
}
/**
* p1022_rdk_exit: machine driver exit
*
* This function is called when this driver is unloaded.
*/
static void __exit p1022_rdk_exit(void)
{
platform_driver_unregister(&p1022_rdk_driver);
}
late_initcall(p1022_rdk_init);
module_exit(p1022_rdk_exit);
MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
MODULE_DESCRIPTION("Freescale / iVeia P1022 RDK ALSA SoC machine driver");
MODULE_LICENSE("GPL v2");