[mirror_ubuntu-artful-kernel.git] / sound / soc / imx / imx-audmux.c

/*
 * Copyright 2012 Freescale Semiconductor, Inc.
 * Copyright 2012 Linaro Ltd.
 * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
 *
 * Initial development of this code was funded by
 * Phytec Messtechnik GmbH, http://www.phytec.de
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include "imx-audmux.h"

#define DRIVER_NAME "imx-audmux"

static struct clk *audmux_clk;
static void __iomem *audmux_base;

#define IMX_AUDMUX_V2_PTCR(x)		((x) * 8)
#define IMX_AUDMUX_V2_PDCR(x)		((x) * 8 + 4)

#ifdef CONFIG_DEBUG_FS
static struct dentry *audmux_debugfs_root;

static int audmux_open_file(struct inode *inode, struct file *file)
{
	file->private_data = inode->i_private;
	return 0;
}

/* There is an annoying discontinuity in the SSI numbering with regard
 * to the Linux number of the devices */
static const char *audmux_port_string(int port)
{
	switch (port) {
	case MX31_AUDMUX_PORT1_SSI0:
		return "imx-ssi.0";
	case MX31_AUDMUX_PORT2_SSI1:
		return "imx-ssi.1";
	case MX31_AUDMUX_PORT3_SSI_PINS_3:
		return "SSI3";
	case MX31_AUDMUX_PORT4_SSI_PINS_4:
		return "SSI4";
	case MX31_AUDMUX_PORT5_SSI_PINS_5:
		return "SSI5";
	case MX31_AUDMUX_PORT6_SSI_PINS_6:
		return "SSI6";
	default:
		return "UNKNOWN";
	}
}

static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
				size_t count, loff_t *ppos)
{
	ssize_t ret;
	char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	int port = (int)file->private_data;
	u32 pdcr, ptcr;

	if (!buf)
		return -ENOMEM;

	if (audmux_clk)
		clk_prepare_enable(audmux_clk);

	ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
	pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));

	if (audmux_clk)
		clk_disable_unprepare(audmux_clk);

	ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
		       pdcr, ptcr);

	if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
		ret += snprintf(buf + ret, PAGE_SIZE - ret,
				"TxFS output from %s, ",
				audmux_port_string((ptcr >> 27) & 0x7));
	else
		ret += snprintf(buf + ret, PAGE_SIZE - ret,
				"TxFS input, ");

	if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
		ret += snprintf(buf + ret, PAGE_SIZE - ret,
				"TxClk output from %s",
				audmux_port_string((ptcr >> 22) & 0x7));
	else
		ret += snprintf(buf + ret, PAGE_SIZE - ret,
				"TxClk input");

	ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");

	if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
		ret += snprintf(buf + ret, PAGE_SIZE - ret,
				"Port is symmetric");
	} else {
		if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
			ret += snprintf(buf + ret, PAGE_SIZE - ret,
					"RxFS output from %s, ",
					audmux_port_string((ptcr >> 17) & 0x7));
		else
			ret += snprintf(buf + ret, PAGE_SIZE - ret,
					"RxFS input, ");

		if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
			ret += snprintf(buf + ret, PAGE_SIZE - ret,
					"RxClk output from %s",
					audmux_port_string((ptcr >> 12) & 0x7));
		else
			ret += snprintf(buf + ret, PAGE_SIZE - ret,
					"RxClk input");
	}

	ret += snprintf(buf + ret, PAGE_SIZE - ret,
			"\nData received from %s\n",
			audmux_port_string((pdcr >> 13) & 0x7));

	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);

	kfree(buf);

	return ret;
}

static const struct file_operations audmux_debugfs_fops = {
	.open = audmux_open_file,
	.read = audmux_read_file,
	.llseek = default_llseek,
};

static void __init audmux_debugfs_init(void)
{
	int i;
	char buf[20];

	audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
	if (!audmux_debugfs_root) {
		pr_warning("Failed to create AUDMUX debugfs root\n");
		return;
	}

	for (i = 1; i < 8; i++) {
		snprintf(buf, sizeof(buf), "ssi%d", i);
		if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
					 (void *)i, &audmux_debugfs_fops))
			pr_warning("Failed to create AUDMUX port %d debugfs file\n",
				   i);
	}
}

static void __devexit audmux_debugfs_remove(void)
{
	debugfs_remove_recursive(audmux_debugfs_root);
}
#else
static inline void audmux_debugfs_init(void)
{
}

static inline void audmux_debugfs_remove(void)
{
}
#endif

enum imx_audmux_type {
	IMX21_AUDMUX,
	IMX31_AUDMUX,
} audmux_type;

static struct platform_device_id imx_audmux_ids[] = {
	{
		.name = "imx21-audmux",
		.driver_data = IMX21_AUDMUX,
	}, {
		.name = "imx31-audmux",
		.driver_data = IMX31_AUDMUX,
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(platform, imx_audmux_ids);

static const struct of_device_id imx_audmux_dt_ids[] = {
	{ .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
	{ .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);

static const uint8_t port_mapping[] = {
	0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
};

int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
{
	if (audmux_type != IMX21_AUDMUX)
		return -EINVAL;

	if (!audmux_base)
		return -ENOSYS;

	if (port >= ARRAY_SIZE(port_mapping))
		return -EINVAL;

	writel(pcr, audmux_base + port_mapping[port]);

	return 0;
}
EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);

int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
		unsigned int pdcr)
{
	if (audmux_type != IMX31_AUDMUX)
		return -EINVAL;

	if (!audmux_base)
		return -ENOSYS;

	if (audmux_clk)
		clk_prepare_enable(audmux_clk);

	writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
	writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));

	if (audmux_clk)
		clk_disable_unprepare(audmux_clk);

	return 0;
}
EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);

static int __devinit imx_audmux_probe(struct platform_device *pdev)
{
	struct resource *res;
	const struct of_device_id *of_id =
			of_match_device(imx_audmux_dt_ids, &pdev->dev);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	audmux_base = devm_request_and_ioremap(&pdev->dev, res);
	if (!audmux_base)
		return -EADDRNOTAVAIL;

	audmux_clk = clk_get(&pdev->dev, "audmux");
	if (IS_ERR(audmux_clk)) {
		dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
				PTR_ERR(audmux_clk));
		audmux_clk = NULL;
	}

	if (of_id)
		pdev->id_entry = of_id->data;
	audmux_type = pdev->id_entry->driver_data;
	if (audmux_type == IMX31_AUDMUX)
		audmux_debugfs_init();

	return 0;
}

static int __devexit imx_audmux_remove(struct platform_device *pdev)
{
	if (audmux_type == IMX31_AUDMUX)
		audmux_debugfs_remove();
	clk_put(audmux_clk);

	return 0;
}

static struct platform_driver imx_audmux_driver = {
	.probe		= imx_audmux_probe,
	.remove		= __devexit_p(imx_audmux_remove),
	.id_table	= imx_audmux_ids,
	.driver	= {
		.name	= DRIVER_NAME,
		.owner	= THIS_MODULE,
		.of_match_table = imx_audmux_dt_ids,
	}
};

static int __init imx_audmux_init(void)
{
	return platform_driver_register(&imx_audmux_driver);
}
subsys_initcall(imx_audmux_init);

static void __exit imx_audmux_exit(void)
{
	platform_driver_unregister(&imx_audmux_driver);
}
module_exit(imx_audmux_exit);

MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);
Commit	Line	Data
9eedbdf1	1	/*
3bc34a61 RZ	2	* Copyright 2012 Freescale Semiconductor, Inc.
3bc34a61 RZ	3	* Copyright 2012 Linaro Ltd.
9eedbdf1 SH	4	* Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
	5	*
	6	* Initial development of this code was funded by
	7	* Phytec Messtechnik GmbH, http://www.phytec.de
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
9eedbdf1 SH	18	*/
9eedbdf1 SH	19
9eedbdf1	20	#include <linux/clk.h>
7b4e08a7	21	#include <linux/debugfs.h>
3bc34a61 RZ	22	#include <linux/err.h>
	23	#include <linux/io.h>
	24	#include <linux/module.h>
9d5ef266 RZ	25	#include <linux/of.h>
9d5ef266 RZ	26	#include <linux/of_device.h>
3bc34a61	27	#include <linux/platform_device.h>
5a0e3ad6	28	#include <linux/slab.h>
3c77c29c SG	29
3c77c29c SG	30	#include "imx-audmux.h"
3bc34a61 RZ	31
3bc34a61 RZ	32	#define DRIVER_NAME "imx-audmux"
9eedbdf1 SH	33
	34	static struct clk *audmux_clk;
	35	static void __iomem *audmux_base;
	36
af4872fb SG	37	#define IMX_AUDMUX_V2_PTCR(x) ((x) * 8)
af4872fb SG	38	#define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
9eedbdf1	39
7b4e08a7 MB	40	#ifdef CONFIG_DEBUG_FS
	41	static struct dentry *audmux_debugfs_root;
	42
	43	static int audmux_open_file(struct inode inode, struct file file)
	44	{
	45	file->private_data = inode->i_private;
	46	return 0;
	47	}
	48
	49	/* There is an annoying discontinuity in the SSI numbering with regard
	50	* to the Linux number of the devices */
	51	static const char *audmux_port_string(int port)
	52	{
	53	switch (port) {
	54	case MX31_AUDMUX_PORT1_SSI0:
	55	return "imx-ssi.0";
	56	case MX31_AUDMUX_PORT2_SSI1:
	57	return "imx-ssi.1";
	58	case MX31_AUDMUX_PORT3_SSI_PINS_3:
	59	return "SSI3";
	60	case MX31_AUDMUX_PORT4_SSI_PINS_4:
	61	return "SSI4";
	62	case MX31_AUDMUX_PORT5_SSI_PINS_5:
	63	return "SSI5";
	64	case MX31_AUDMUX_PORT6_SSI_PINS_6:
	65	return "SSI6";
	66	default:
	67	return "UNKNOWN";
	68	}
	69	}
	70
	71	static ssize_t audmux_read_file(struct file file, char __user user_buf,
	72	size_t count, loff_t *ppos)
	73	{
	74	ssize_t ret;
	75	char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	76	int port = (int)file->private_data;
	77	u32 pdcr, ptcr;
	78
	79	if (!buf)
	80	return -ENOMEM;
	81
	82	if (audmux_clk)
bac59328	83	clk_prepare_enable(audmux_clk);
7b4e08a7	84
af4872fb SG	85	ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
af4872fb SG	86	pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
7b4e08a7 MB	87
7b4e08a7 MB	88	if (audmux_clk)
bac59328	89	clk_disable_unprepare(audmux_clk);
7b4e08a7 MB	90
	91	ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
	92	pdcr, ptcr);
	93
af4872fb	94	if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
7b4e08a7 MB	95	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	96	"TxFS output from %s, ",
	97	audmux_port_string((ptcr >> 27) & 0x7));
	98	else
	99	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	100	"TxFS input, ");
	101
af4872fb	102	if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
7b4e08a7 MB	103	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	104	"TxClk output from %s",
	105	audmux_port_string((ptcr >> 22) & 0x7));
	106	else
	107	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	108	"TxClk input");
	109
	110	ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
	111
af4872fb	112	if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
7b4e08a7 MB	113	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	114	"Port is symmetric");
	115	} else {
af4872fb	116	if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
7b4e08a7 MB	117	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	118	"RxFS output from %s, ",
	119	audmux_port_string((ptcr >> 17) & 0x7));
	120	else
	121	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	122	"RxFS input, ");
	123
af4872fb	124	if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
7b4e08a7 MB	125	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	126	"RxClk output from %s",
	127	audmux_port_string((ptcr >> 12) & 0x7));
	128	else
	129	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	130	"RxClk input");
	131	}
	132
	133	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	134	"\nData received from %s\n",
	135	audmux_port_string((pdcr >> 13) & 0x7));
	136
	137	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
	138
	139	kfree(buf);
	140
	141	return ret;
	142	}
	143
	144	static const struct file_operations audmux_debugfs_fops = {
	145	.open = audmux_open_file,
	146	.read = audmux_read_file,
6038f373	147	.llseek = default_llseek,
7b4e08a7 MB	148	};
7b4e08a7 MB	149
3bc34a61	150	static void __init audmux_debugfs_init(void)
7b4e08a7 MB	151	{
	152	int i;
	153	char buf[20];
	154
	155	audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
	156	if (!audmux_debugfs_root) {
	157	pr_warning("Failed to create AUDMUX debugfs root\n");
	158	return;
	159	}
	160
	161	for (i = 1; i < 8; i++) {
	162	snprintf(buf, sizeof(buf), "ssi%d", i);
	163	if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
	164	(void *)i, &audmux_debugfs_fops))
	165	pr_warning("Failed to create AUDMUX port %d debugfs file\n",
	166	i);
	167	}
	168	}
3bc34a61	169
fb97624a	170	static void __devexit audmux_debugfs_remove(void)
3bc34a61 RZ	171	{
	172	debugfs_remove_recursive(audmux_debugfs_root);
	173	}
7b4e08a7 MB	174	#else
	175	static inline void audmux_debugfs_init(void)
	176	{
	177	}
3bc34a61 RZ	178
	179	static inline void audmux_debugfs_remove(void)
	180	{
	181	}
7b4e08a7 MB	182	#endif
7b4e08a7 MB	183
3bc34a61 RZ	184	enum imx_audmux_type {
	185	IMX21_AUDMUX,
	186	IMX31_AUDMUX,
	187	} audmux_type;
	188
	189	static struct platform_device_id imx_audmux_ids[] = {
	190	{
	191	.name = "imx21-audmux",
	192	.driver_data = IMX21_AUDMUX,
	193	}, {
	194	.name = "imx31-audmux",
	195	.driver_data = IMX31_AUDMUX,
	196	}, {
	197	/* sentinel */
	198	}
	199	};
	200	MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
	201
9d5ef266 RZ	202	static const struct of_device_id imx_audmux_dt_ids[] = {
	203	{ .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
	204	{ .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
	205	{ /* sentinel */ }
	206	};
	207	MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
	208
2405fc97 SG	209	static const uint8_t port_mapping[] = {
	210	0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
	211	};
	212
af4872fb	213	int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
2405fc97	214	{
3bc34a61 RZ	215	if (audmux_type != IMX21_AUDMUX)
	216	return -EINVAL;
	217
2405fc97 SG	218	if (!audmux_base)
	219	return -ENOSYS;
	220
	221	if (port >= ARRAY_SIZE(port_mapping))
	222	return -EINVAL;
	223
	224	writel(pcr, audmux_base + port_mapping[port]);
	225
	226	return 0;
	227	}
af4872fb	228	EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
2405fc97	229
af4872fb	230	int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
9eedbdf1 SH	231	unsigned int pdcr)
9eedbdf1 SH	232	{
3bc34a61 RZ	233	if (audmux_type != IMX31_AUDMUX)
	234	return -EINVAL;
	235
9eedbdf1 SH	236	if (!audmux_base)
	237	return -ENOSYS;
	238
	239	if (audmux_clk)
bac59328	240	clk_prepare_enable(audmux_clk);
9eedbdf1	241
af4872fb SG	242	writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
af4872fb SG	243	writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
9eedbdf1 SH	244
9eedbdf1 SH	245	if (audmux_clk)
bac59328	246	clk_disable_unprepare(audmux_clk);
9eedbdf1 SH	247
	248	return 0;
	249	}
af4872fb	250	EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
9eedbdf1	251
fb97624a	252	static int __devinit imx_audmux_probe(struct platform_device *pdev)
9eedbdf1	253	{
3bc34a61	254	struct resource *res;
9d5ef266 RZ	255	const struct of_device_id *of_id =
9d5ef266 RZ	256	of_match_device(imx_audmux_dt_ids, &pdev->dev);
3bc34a61 RZ	257
	258	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	259	audmux_base = devm_request_and_ioremap(&pdev->dev, res);
	260	if (!audmux_base)
	261	return -EADDRNOTAVAIL;
	262
	263	audmux_clk = clk_get(&pdev->dev, "audmux");
	264	if (IS_ERR(audmux_clk)) {
	265	dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
	266	PTR_ERR(audmux_clk));
	267	audmux_clk = NULL;
8402ed30	268	}
56c6b872	269
9d5ef266 RZ	270	if (of_id)
9d5ef266 RZ	271	pdev->id_entry = of_id->data;
3bc34a61 RZ	272	audmux_type = pdev->id_entry->driver_data;
3bc34a61 RZ	273	if (audmux_type == IMX31_AUDMUX)
2405fc97	274	audmux_debugfs_init();
7b4e08a7	275
9eedbdf1 SH	276	return 0;
	277	}
	278
fb97624a	279	static int __devexit imx_audmux_remove(struct platform_device *pdev)
3bc34a61 RZ	280	{
	281	if (audmux_type == IMX31_AUDMUX)
	282	audmux_debugfs_remove();
	283	clk_put(audmux_clk);
	284
	285	return 0;
	286	}
	287
	288	static struct platform_driver imx_audmux_driver = {
	289	.probe = imx_audmux_probe,
fb97624a	290	.remove = __devexit_p(imx_audmux_remove),
3bc34a61 RZ	291	.id_table = imx_audmux_ids,
	292	.driver = {
	293	.name = DRIVER_NAME,
	294	.owner = THIS_MODULE,
9d5ef266	295	.of_match_table = imx_audmux_dt_ids,
3bc34a61 RZ	296	}
	297	};
	298
	299	static int __init imx_audmux_init(void)
	300	{
	301	return platform_driver_register(&imx_audmux_driver);
	302	}
	303	subsys_initcall(imx_audmux_init);
	304
	305	static void __exit imx_audmux_exit(void)
	306	{
	307	platform_driver_unregister(&imx_audmux_driver);
	308	}
	309	module_exit(imx_audmux_exit);
	310
	311	MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
	312	MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
	313	MODULE_LICENSE("GPL v2");
	314	MODULE_ALIAS("platform:" DRIVER_NAME);