[deliverable/linux.git] / sound / soc / fsl / p1022_rdk.c

/**
 * 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 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");
Commit	Line	Data
96a0af6d TT	1	/**
	2	* Freescale P1022RDK ALSA SoC Machine driver
	3	*
	4	* Author: Timur Tabi <timur@freescale.com>
	5	*
	6	* Copyright 2012 Freescale Semiconductor, Inc.
	7	*
	8	* This file is licensed under the terms of the GNU General Public License
	9	* version 2. This program is licensed "as is" without any warranty of any
	10	* kind, whether express or implied.
	11	*
	12	* Note: in order for audio to work correctly, the output controls need
	13	* to be enabled, because they control the clock. So for playback, for
	14	* example:
	15	*
	16	* amixer sset 'Left Output Mixer PCM' on
	17	* amixer sset 'Right Output Mixer PCM' on
	18	*/
	19
	20	#include <linux/module.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/of_device.h>
	23	#include <linux/slab.h>
	24	#include <sound/soc.h>
	25	#include <asm/fsl_guts.h>
	26
	27	#include "fsl_dma.h"
	28	#include "fsl_ssi.h"
	29	#include "fsl_utils.h"
	30
	31	/* P1022-specific PMUXCR and DMUXCR bit definitions */
	32
	33	#define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK 0x0001c000
	34	#define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI 0x00010000
	35	#define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI 0x00018000
	36
	37	#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK 0x00000c00
	38	#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI 0x00000000
	39
	40	#define CCSR_GUTS_DMUXCR_PAD 1 /* DMA controller/channel set to pad */
	41	#define CCSR_GUTS_DMUXCR_SSI 2 /* DMA controller/channel set to SSI */
	42
	43	/*
	44	* Set the DMACR register in the GUTS
	45	*
	46	* The DMACR register determines the source of initiated transfers for each
	47	* channel on each DMA controller. Rather than have a bunch of repetitive
	48	* macros for the bit patterns, we just have a function that calculates
	49	* them.
	50	*
	51	* guts: Pointer to GUTS structure
	52	* co: The DMA controller (0 or 1)
	53	* ch: The channel on the DMA controller (0, 1, 2, or 3)
	54	* device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
	55	*/
	56	static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
	57	unsigned int co, unsigned int ch, unsigned int device)
	58	{
	59	unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
	60
	61	clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
	62	}
	63
	64	/* There's only one global utilities register */
65	static phys_addr_t guts_phys;
66
67	/**
68	* machine_data: machine-specific ASoC device data
69	*
70	* This structure contains data for a single sound platform device on an
71	* P1022 RDK. Some of the data is taken from the device tree.
72	*/
73	struct machine_data {
74	struct snd_soc_dai_link dai[2];
75	struct snd_soc_card card;
76	unsigned int dai_format;
77	unsigned int codec_clk_direction;
78	unsigned int cpu_clk_direction;
79	unsigned int clk_frequency;
80	unsigned int dma_id[2]; /* 0 = DMA1, 1 = DMA2, etc */
81	unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
82	char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
83	};
84
85	/**
86	* p1022_rdk_machine_probe: initialize the board
87	*
88	* This function is used to initialize the board-specific hardware.
89	*
90	* Here we program the DMACR and PMUXCR registers.
91	*/
92	static int p1022_rdk_machine_probe(struct snd_soc_card *card)
93	{
94	struct machine_data *mdata =
95	container_of(card, struct machine_data, card);
96	struct ccsr_guts __iomem *guts;
97
98	guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
99	if (!guts) {
100	dev_err(card->dev, "could not map global utilities\n");
101	return -ENOMEM;
102	}
103
104	/* Enable SSI Tx signal */
105	clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
106	CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
107
108	/* Enable SSI Rx signal */
109	clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
110	CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);
111
112	/* Enable DMA Channel for SSI */
113	guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
114	CCSR_GUTS_DMUXCR_SSI);
115
116	guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
117	CCSR_GUTS_DMUXCR_SSI);
118
119	iounmap(guts);
120
121	return 0;
122	}
123
124	/**
125	* p1022_rdk_startup: program the board with various hardware parameters
126	*
127	* This function takes board-specific information, like clock frequencies
128	* and serial data formats, and passes that information to the codec and
129	* transport drivers.
130	*/
131	static int p1022_rdk_startup(struct snd_pcm_substream *substream)
132	{
133	struct snd_soc_pcm_runtime *rtd = substream->private_data;
134	struct machine_data *mdata =
135	container_of(rtd->card, struct machine_data, card);
136	struct device *dev = rtd->card->dev;
137	int ret = 0;
138
139	/* Tell the codec driver what the serial protocol is. */
140	ret = snd_soc_dai_set_fmt(rtd->codec_dai, mdata->dai_format);
141	if (ret < 0) {
142	dev_err(dev, "could not set codec driver audio format (ret=%i)\n",
143	ret);
144	return ret;
145	}
146
147	ret = snd_soc_dai_set_pll(rtd->codec_dai, 0, 0, mdata->clk_frequency,
148	mdata->clk_frequency);
149	if (ret < 0) {
150	dev_err(dev, "could not set codec PLL frequency (ret=%i)\n",
151	ret);
152	return ret;
153	}
154
155	return 0;
156	}
157
158	/**
159	* p1022_rdk_machine_remove: Remove the sound device
160	*
161	* This function is called to remove the sound device for one SSI. We
162	* de-program the DMACR and PMUXCR register.
163	*/
164	static int p1022_rdk_machine_remove(struct snd_soc_card *card)
165	{
166	struct machine_data *mdata =
167	container_of(card, struct machine_data, card);
168	struct ccsr_guts __iomem *guts;
169
170	guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
171	if (!guts) {
172	dev_err(card->dev, "could not map global utilities\n");
173	return -ENOMEM;
174	}
175
176	/* Restore the signal routing */
177	clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
178	clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
179	guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
180	guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);
181
182	iounmap(guts);
183
184	return 0;
185	}
186
187	/**
188	* p1022_rdk_ops: ASoC machine driver operations
189	*/
190	static struct snd_soc_ops p1022_rdk_ops = {
191	.startup = p1022_rdk_startup,
192	};
193
194	/**
195	* p1022_rdk_probe: platform probe function for the machine driver
196	*
197	* Although this is a machine driver, the SSI node is the "master" node with
198	* respect to audio hardware connections. Therefore, we create a new ASoC
199	* device for each new SSI node that has a codec attached.
200	*/
201	static int p1022_rdk_probe(struct platform_device *pdev)
202	{
203	struct device *dev = pdev->dev.parent;
204	/* ssi_pdev is the platform device for the SSI node that probed us */
205	struct platform_device *ssi_pdev =
206	container_of(dev, struct platform_device, dev);
207	struct device_node *np = ssi_pdev->dev.of_node;
208	struct device_node *codec_np = NULL;
209	struct machine_data *mdata;
210	const u32 *iprop;
211	int ret;
212
213	/* Find the codec node for this SSI. */
214	codec_np = of_parse_phandle(np, "codec-handle", 0);
215	if (!codec_np) {
216	dev_err(dev, "could not find codec node\n");
217	return -EINVAL;
218	}
219
220	mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
221	if (!mdata) {
222	ret = -ENOMEM;
223	goto error_put;
224	}
225
226	mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
227	mdata->dai[0].ops = &p1022_rdk_ops;
228
229	/* ASoC core can match codec with device node */
230	mdata->dai[0].codec_of_node = codec_np;
231
232	/*
233	* We register two DAIs per SSI, one for playback and the other for
234	* capture. We support codecs that have separate DAIs for both playback
235	* and capture.
236	*/
237	memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
238
239	/* The DAI names from the codec (snd_soc_dai_driver.name) */
240	mdata->dai[0].codec_dai_name = "wm8960-hifi";
241	mdata->dai[1].codec_dai_name = mdata->dai[0].codec_dai_name;
242
243	/*
244	* Configure the SSI for I2S slave mode. Older device trees have
245	* an fsl,mode property, but we ignore that since there's really
246	* only one way to configure the SSI.
247	*/
248	mdata->dai_format = SND_SOC_DAIFMT_NB_NF \|
249	SND_SOC_DAIFMT_I2S \| SND_SOC_DAIFMT_CBM_CFM;
250	mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
251	mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
252
253	/*
254	* In i2s-slave mode, the codec has its own clock source, so we
255	* need to get the frequency from the device tree and pass it to
256	* the codec driver.
257	*/
258	iprop = of_get_property(codec_np, "clock-frequency", NULL);
259	if (!iprop \|\| !*iprop) {
260	dev_err(&pdev->dev, "codec bus-frequency property is missing or invalid\n");
261	ret = -EINVAL;
262	goto error;
263	}
264	mdata->clk_frequency = be32_to_cpup(iprop);
265
266	if (!mdata->clk_frequency) {
267	dev_err(&pdev->dev, "unknown clock frequency\n");
268	ret = -EINVAL;
269	goto error;
270	}
271
272	/* Find the playback DMA channel to use. */
273	mdata->dai[0].platform_name = mdata->platform_name[0];
274	ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
275	&mdata->dma_channel_id[0],
276	&mdata->dma_id[0]);
277	if (ret) {
278	dev_err(&pdev->dev, "missing/invalid playback DMA phandle (ret=%i)\n",
279	ret);
280	goto error;
281	}
282
283	/* Find the capture DMA channel to use. */
284	mdata->dai[1].platform_name = mdata->platform_name[1];
285	ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
286	&mdata->dma_channel_id[1],
287	&mdata->dma_id[1]);
288	if (ret) {
289	dev_err(&pdev->dev, "missing/invalid capture DMA phandle (ret=%i)\n",
290	ret);
291	goto error;
292	}
293
294	/* Initialize our DAI data structure. */
295	mdata->dai[0].stream_name = "playback";
296	mdata->dai[1].stream_name = "capture";
297	mdata->dai[0].name = mdata->dai[0].stream_name;
298	mdata->dai[1].name = mdata->dai[1].stream_name;
299
300	mdata->card.probe = p1022_rdk_machine_probe;
301	mdata->card.remove = p1022_rdk_machine_remove;
302	mdata->card.name = pdev->name; /* The platform driver name */
303	mdata->card.owner = THIS_MODULE;
304	mdata->card.dev = &pdev->dev;
305	mdata->card.num_links = 2;
306	mdata->card.dai_link = mdata->dai;
307
308	/* Register with ASoC */
309	ret = snd_soc_register_card(&mdata->card);
310	if (ret) {
311	dev_err(&pdev->dev, "could not register card (ret=%i)\n", ret);
312	goto error;
313	}
314
315	return 0;
316
317	error:
318	kfree(mdata);
319	error_put:
320	of_node_put(codec_np);
321	return ret;
322	}
323
324	/**
325	* p1022_rdk_remove: remove the platform device
326	*
327	* This function is called when the platform device is removed.
328	*/
a0a3d518	329	static int p1022_rdk_remove(struct platform_device *pdev)
96a0af6d TT	330	{
	331	struct snd_soc_card *card = platform_get_drvdata(pdev);
	332	struct machine_data *mdata =
	333	container_of(card, struct machine_data, card);
	334
	335	snd_soc_unregister_card(card);
	336	kfree(mdata);
	337
	338	return 0;
	339	}
	340
	341	static struct platform_driver p1022_rdk_driver = {
	342	.probe = p1022_rdk_probe,
a0a3d518	343	.remove = p1022_rdk_remove,
96a0af6d TT	344	.driver = {
	345	/*
	346	* The name must match 'compatible' property in the device tree,
	347	* in lowercase letters.
	348	*/
	349	.name = "snd-soc-p1022rdk",
	350	.owner = THIS_MODULE,
	351	},
	352	};
	353
	354	/**
	355	* p1022_rdk_init: machine driver initialization.
	356	*
	357	* This function is called when this module is loaded.
	358	*/
	359	static int __init p1022_rdk_init(void)
	360	{
	361	struct device_node *guts_np;
	362	struct resource res;
	363
	364	/* Get the physical address of the global utilities registers */
	365	guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
	366	if (of_address_to_resource(guts_np, 0, &res)) {
	367	pr_err("snd-soc-p1022rdk: missing/invalid global utils node\n");
	368	of_node_put(guts_np);
	369	return -EINVAL;
	370	}
	371	guts_phys = res.start;
	372	of_node_put(guts_np);
	373
	374	return platform_driver_register(&p1022_rdk_driver);
	375	}
	376
	377	/**
	378	* p1022_rdk_exit: machine driver exit
	379	*
	380	* This function is called when this driver is unloaded.
	381	*/
	382	static void __exit p1022_rdk_exit(void)
	383	{
	384	platform_driver_unregister(&p1022_rdk_driver);
	385	}
	386
	387	late_initcall(p1022_rdk_init);
	388	module_exit(p1022_rdk_exit);
	389
	390	MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
	391	MODULE_DESCRIPTION("Freescale / iVeia P1022 RDK ALSA SoC machine driver");
	392	MODULE_LICENSE("GPL v2");