[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/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_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(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 __exit 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 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_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(audmux_clk);

	return 0;
}
EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);

static int __init imx_audmux_probe(struct platform_device *pdev)
{
	struct resource *res;

	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;
	}

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

	return 0;
}

static int __exit 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		= __exit_p(imx_audmux_remove),
	.id_table	= imx_audmux_ids,
	.driver	= {
		.name	= DRIVER_NAME,
		.owner	= THIS_MODULE,
	}
};

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>
	25	#include <linux/platform_device.h>
5a0e3ad6	26	#include <linux/slab.h>
3c77c29c SG	27
3c77c29c SG	28	#include "imx-audmux.h"
3bc34a61 RZ	29
3bc34a61 RZ	30	#define DRIVER_NAME "imx-audmux"
9eedbdf1 SH	31
	32	static struct clk *audmux_clk;
	33	static void __iomem *audmux_base;
	34
af4872fb SG	35	#define IMX_AUDMUX_V2_PTCR(x) ((x) * 8)
af4872fb SG	36	#define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
9eedbdf1	37
7b4e08a7 MB	38	#ifdef CONFIG_DEBUG_FS
	39	static struct dentry *audmux_debugfs_root;
	40
	41	static int audmux_open_file(struct inode inode, struct file file)
	42	{
	43	file->private_data = inode->i_private;
	44	return 0;
	45	}
	46
	47	/* There is an annoying discontinuity in the SSI numbering with regard
	48	* to the Linux number of the devices */
	49	static const char *audmux_port_string(int port)
	50	{
	51	switch (port) {
	52	case MX31_AUDMUX_PORT1_SSI0:
	53	return "imx-ssi.0";
	54	case MX31_AUDMUX_PORT2_SSI1:
	55	return "imx-ssi.1";
	56	case MX31_AUDMUX_PORT3_SSI_PINS_3:
	57	return "SSI3";
	58	case MX31_AUDMUX_PORT4_SSI_PINS_4:
	59	return "SSI4";
	60	case MX31_AUDMUX_PORT5_SSI_PINS_5:
	61	return "SSI5";
	62	case MX31_AUDMUX_PORT6_SSI_PINS_6:
	63	return "SSI6";
	64	default:
	65	return "UNKNOWN";
	66	}
	67	}
	68
	69	static ssize_t audmux_read_file(struct file file, char __user user_buf,
	70	size_t count, loff_t *ppos)
	71	{
	72	ssize_t ret;
	73	char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	74	int port = (int)file->private_data;
	75	u32 pdcr, ptcr;
	76
	77	if (!buf)
	78	return -ENOMEM;
	79
	80	if (audmux_clk)
	81	clk_enable(audmux_clk);
	82
af4872fb SG	83	ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
af4872fb SG	84	pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
7b4e08a7 MB	85
	86	if (audmux_clk)
	87	clk_disable(audmux_clk);
	88
	89	ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
	90	pdcr, ptcr);
	91
af4872fb	92	if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
7b4e08a7 MB	93	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	94	"TxFS output from %s, ",
	95	audmux_port_string((ptcr >> 27) & 0x7));
	96	else
	97	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	98	"TxFS input, ");
	99
af4872fb	100	if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
7b4e08a7 MB	101	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	102	"TxClk output from %s",
	103	audmux_port_string((ptcr >> 22) & 0x7));
	104	else
	105	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	106	"TxClk input");
	107
	108	ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
	109
af4872fb	110	if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
7b4e08a7 MB	111	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	112	"Port is symmetric");
	113	} else {
af4872fb	114	if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
7b4e08a7 MB	115	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	116	"RxFS output from %s, ",
	117	audmux_port_string((ptcr >> 17) & 0x7));
	118	else
	119	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	120	"RxFS input, ");
	121
af4872fb	122	if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
7b4e08a7 MB	123	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	124	"RxClk output from %s",
	125	audmux_port_string((ptcr >> 12) & 0x7));
	126	else
	127	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	128	"RxClk input");
	129	}
	130
	131	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	132	"\nData received from %s\n",
	133	audmux_port_string((pdcr >> 13) & 0x7));
	134
	135	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
	136
	137	kfree(buf);
	138
	139	return ret;
	140	}
	141
	142	static const struct file_operations audmux_debugfs_fops = {
	143	.open = audmux_open_file,
	144	.read = audmux_read_file,
6038f373	145	.llseek = default_llseek,
7b4e08a7 MB	146	};
7b4e08a7 MB	147
3bc34a61	148	static void __init audmux_debugfs_init(void)
7b4e08a7 MB	149	{
	150	int i;
	151	char buf[20];
	152
	153	audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
	154	if (!audmux_debugfs_root) {
	155	pr_warning("Failed to create AUDMUX debugfs root\n");
	156	return;
	157	}
	158
	159	for (i = 1; i < 8; i++) {
	160	snprintf(buf, sizeof(buf), "ssi%d", i);
	161	if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
	162	(void *)i, &audmux_debugfs_fops))
	163	pr_warning("Failed to create AUDMUX port %d debugfs file\n",
	164	i);
	165	}
	166	}
3bc34a61 RZ	167
	168	static void __exit audmux_debugfs_remove(void)
	169	{
	170	debugfs_remove_recursive(audmux_debugfs_root);
	171	}
7b4e08a7 MB	172	#else
	173	static inline void audmux_debugfs_init(void)
	174	{
	175	}
3bc34a61 RZ	176
	177	static inline void audmux_debugfs_remove(void)
	178	{
	179	}
7b4e08a7 MB	180	#endif
7b4e08a7 MB	181
3bc34a61 RZ	182	enum imx_audmux_type {
	183	IMX21_AUDMUX,
	184	IMX31_AUDMUX,
	185	} audmux_type;
	186
	187	static struct platform_device_id imx_audmux_ids[] = {
	188	{
	189	.name = "imx21-audmux",
	190	.driver_data = IMX21_AUDMUX,
	191	}, {
	192	.name = "imx31-audmux",
	193	.driver_data = IMX31_AUDMUX,
	194	}, {
	195	/* sentinel */
	196	}
	197	};
	198	MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
	199
2405fc97 SG	200	static const uint8_t port_mapping[] = {
	201	0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
	202	};
	203
af4872fb	204	int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
2405fc97	205	{
3bc34a61 RZ	206	if (audmux_type != IMX21_AUDMUX)
	207	return -EINVAL;
	208
2405fc97 SG	209	if (!audmux_base)
	210	return -ENOSYS;
	211
	212	if (port >= ARRAY_SIZE(port_mapping))
	213	return -EINVAL;
	214
	215	writel(pcr, audmux_base + port_mapping[port]);
	216
	217	return 0;
	218	}
af4872fb	219	EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
2405fc97	220
af4872fb	221	int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
9eedbdf1 SH	222	unsigned int pdcr)
9eedbdf1 SH	223	{
3bc34a61 RZ	224	if (audmux_type != IMX31_AUDMUX)
	225	return -EINVAL;
	226
9eedbdf1 SH	227	if (!audmux_base)
	228	return -ENOSYS;
	229
	230	if (audmux_clk)
	231	clk_enable(audmux_clk);
	232
af4872fb SG	233	writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
af4872fb SG	234	writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
9eedbdf1 SH	235
	236	if (audmux_clk)
	237	clk_disable(audmux_clk);
	238
	239	return 0;
	240	}
af4872fb	241	EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
9eedbdf1	242
3bc34a61	243	static int __init imx_audmux_probe(struct platform_device *pdev)
9eedbdf1	244	{
3bc34a61 RZ	245	struct resource *res;
	246
	247	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	248	audmux_base = devm_request_and_ioremap(&pdev->dev, res);
	249	if (!audmux_base)
	250	return -EADDRNOTAVAIL;
	251
	252	audmux_clk = clk_get(&pdev->dev, "audmux");
	253	if (IS_ERR(audmux_clk)) {
	254	dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
	255	PTR_ERR(audmux_clk));
	256	audmux_clk = NULL;
8402ed30	257	}
56c6b872	258
3bc34a61 RZ	259	audmux_type = pdev->id_entry->driver_data;
3bc34a61 RZ	260	if (audmux_type == IMX31_AUDMUX)
2405fc97	261	audmux_debugfs_init();
7b4e08a7	262
9eedbdf1 SH	263	return 0;
	264	}
	265
3bc34a61 RZ	266	static int __exit imx_audmux_remove(struct platform_device *pdev)
	267	{
	268	if (audmux_type == IMX31_AUDMUX)
	269	audmux_debugfs_remove();
	270	clk_put(audmux_clk);
	271
	272	return 0;
	273	}
	274
	275	static struct platform_driver imx_audmux_driver = {
	276	.probe = imx_audmux_probe,
	277	.remove = __exit_p(imx_audmux_remove),
	278	.id_table = imx_audmux_ids,
	279	.driver = {
	280	.name = DRIVER_NAME,
	281	.owner = THIS_MODULE,
	282	}
	283	};
	284
	285	static int __init imx_audmux_init(void)
	286	{
	287	return platform_driver_register(&imx_audmux_driver);
	288	}
	289	subsys_initcall(imx_audmux_init);
	290
	291	static void __exit imx_audmux_exit(void)
	292	{
	293	platform_driver_unregister(&imx_audmux_driver);
	294	}
	295	module_exit(imx_audmux_exit);
	296
	297	MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
	298	MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
	299	MODULE_LICENSE("GPL v2");
	300	MODULE_ALIAS("platform:" DRIVER_NAME);