Commit 96a0af6d authored by Timur Tabi's avatar Timur Tabi Committed by Mark Brown
Browse files

ASoC: add support for the Freescale / iVeia P1022 RDK reference board 



This small reference boards has a Freescale P1022 dual-core PowerPC SOC
and a Wolfson Microelectronics WM8960 codec.

Signed-off-by: default avatarTimur Tabi <timur@freescale.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent c73adc74

sound/soc/fsl/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -46,6 +46,20 @@ config SND_SOC_P1022_DS 
	  This will also include the Wolfson Microelectronics WM8776 codec

	  driver.



config SND_SOC_P1022_RDK

	tristate "ALSA SoC support for the Freescale / iVeia P1022 RDK board"

	# I2C is necessary for the WM8960 driver

	depends on P1022_RDK && I2C

	select SND_SOC_FSL_SSI

	select SND_SOC_FSL_UTILS

	select SND_SOC_POWERPC_DMA

	select SND_SOC_WM8960

	default y if P1022_RDK

	help

	  Say Y if you want to enable audio on the Freescale / iVeia

	  P1022 RDK board.  This will also include the Wolfson

	  Microelectronics WM8960 codec driver.



config SND_SOC_MPC5200_I2S

	tristate "Freescale MPC5200 PSC in I2S mode driver"

	depends on PPC_MPC52xx && PPC_BESTCOMM

sound/soc/fsl/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -6,6 +6,10 @@ obj-$(CONFIG_SND_SOC_MPC8610_HPCD) += snd-soc-mpc8610-hpcd.o 
snd-soc-p1022-ds-objs := p1022_ds.o

obj-$(CONFIG_SND_SOC_P1022_DS) += snd-soc-p1022-ds.o



# P1022 RDK Machine Support

snd-soc-p1022-rdk-objs := p1022_rdk.o

obj-$(CONFIG_SND_SOC_P1022_RDK) += snd-soc-p1022-rdk.o



# Freescale PowerPC SSI/DMA Platform Support

snd-soc-fsl-ssi-objs := fsl_ssi.o

snd-soc-fsl-utils-objs := fsl_utils.o

sound/soc/fsl/p1022_rdk.c

0 → 100644
+392 −0
Original line number Diff line number Diff line 
/**

 * 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_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 __devexit 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 = __devexit_p(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");