[mirror_ubuntu-bionic-kernel.git] / sound / soc / fsl / 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;

/* 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 = simple_open,
	.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 = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; 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 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

static 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 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_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(audmux_base))
		return PTR_ERR(audmux_base);

	audmux_clk = devm_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 imx_audmux_remove(struct platform_device *pdev)
{
	if (audmux_type == IMX31_AUDMUX)
		audmux_debugfs_remove();

	return 0;
}

static struct platform_driver imx_audmux_driver = {
	.probe		= imx_audmux_probe,
	.remove		= 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
7b4e08a7 MB	43	/* There is an annoying discontinuity in the SSI numbering with regard
	44	* to the Linux number of the devices */
	45	static const char *audmux_port_string(int port)
	46	{
	47	switch (port) {
	48	case MX31_AUDMUX_PORT1_SSI0:
	49	return "imx-ssi.0";
	50	case MX31_AUDMUX_PORT2_SSI1:
	51	return "imx-ssi.1";
	52	case MX31_AUDMUX_PORT3_SSI_PINS_3:
	53	return "SSI3";
	54	case MX31_AUDMUX_PORT4_SSI_PINS_4:
	55	return "SSI4";
	56	case MX31_AUDMUX_PORT5_SSI_PINS_5:
	57	return "SSI5";
	58	case MX31_AUDMUX_PORT6_SSI_PINS_6:
	59	return "SSI6";
	60	default:
	61	return "UNKNOWN";
	62	}
	63	}
	64
	65	static ssize_t audmux_read_file(struct file file, char __user user_buf,
	66	size_t count, loff_t *ppos)
	67	{
	68	ssize_t ret;
	69	char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	70	int port = (int)file->private_data;
	71	u32 pdcr, ptcr;
	72
	73	if (!buf)
	74	return -ENOMEM;
	75
	76	if (audmux_clk)
bac59328	77	clk_prepare_enable(audmux_clk);
7b4e08a7	78
af4872fb SG	79	ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
af4872fb SG	80	pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
7b4e08a7 MB	81
7b4e08a7 MB	82	if (audmux_clk)
bac59328	83	clk_disable_unprepare(audmux_clk);
7b4e08a7 MB	84
	85	ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
	86	pdcr, ptcr);
	87
af4872fb	88	if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
7b4e08a7 MB	89	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	90	"TxFS output from %s, ",
	91	audmux_port_string((ptcr >> 27) & 0x7));
	92	else
	93	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	94	"TxFS input, ");
	95
af4872fb	96	if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
7b4e08a7 MB	97	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	98	"TxClk output from %s",
	99	audmux_port_string((ptcr >> 22) & 0x7));
	100	else
	101	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	102	"TxClk input");
	103
	104	ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
	105
af4872fb	106	if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
7b4e08a7 MB	107	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	108	"Port is symmetric");
	109	} else {
af4872fb	110	if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
7b4e08a7 MB	111	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	112	"RxFS output from %s, ",
	113	audmux_port_string((ptcr >> 17) & 0x7));
	114	else
	115	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	116	"RxFS input, ");
	117
af4872fb	118	if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
7b4e08a7 MB	119	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	120	"RxClk output from %s",
	121	audmux_port_string((ptcr >> 12) & 0x7));
	122	else
	123	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	124	"RxClk input");
	125	}
	126
	127	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	128	"\nData received from %s\n",
	129	audmux_port_string((pdcr >> 13) & 0x7));
	130
	131	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
	132
	133	kfree(buf);
	134
	135	return ret;
	136	}
	137
	138	static const struct file_operations audmux_debugfs_fops = {
234e3405	139	.open = simple_open,
7b4e08a7	140	.read = audmux_read_file,
6038f373	141	.llseek = default_llseek,
7b4e08a7 MB	142	};
7b4e08a7 MB	143
3bc34a61	144	static void __init audmux_debugfs_init(void)
7b4e08a7 MB	145	{
	146	int i;
	147	char buf[20];
	148
	149	audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
	150	if (!audmux_debugfs_root) {
	151	pr_warning("Failed to create AUDMUX debugfs root\n");
	152	return;
	153	}
	154
409b78cc	155	for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
7b4e08a7 MB	156	snprintf(buf, sizeof(buf), "ssi%d", i);
	157	if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
	158	(void *)i, &audmux_debugfs_fops))
	159	pr_warning("Failed to create AUDMUX port %d debugfs file\n",
	160	i);
	161	}
	162	}
3bc34a61	163
a0a3d518	164	static void audmux_debugfs_remove(void)
3bc34a61 RZ	165	{
	166	debugfs_remove_recursive(audmux_debugfs_root);
	167	}
7b4e08a7 MB	168	#else
	169	static inline void audmux_debugfs_init(void)
	170	{
	171	}
3bc34a61 RZ	172
	173	static inline void audmux_debugfs_remove(void)
	174	{
	175	}
7b4e08a7 MB	176	#endif
7b4e08a7 MB	177
a10807ae	178	static enum imx_audmux_type {
3bc34a61 RZ	179	IMX21_AUDMUX,
	180	IMX31_AUDMUX,
	181	} audmux_type;
	182
	183	static struct platform_device_id imx_audmux_ids[] = {
	184	{
	185	.name = "imx21-audmux",
	186	.driver_data = IMX21_AUDMUX,
	187	}, {
	188	.name = "imx31-audmux",
	189	.driver_data = IMX31_AUDMUX,
	190	}, {
	191	/* sentinel */
	192	}
	193	};
	194	MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
	195
9d5ef266 RZ	196	static const struct of_device_id imx_audmux_dt_ids[] = {
	197	{ .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
	198	{ .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
	199	{ /* sentinel */ }
	200	};
	201	MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
	202
2405fc97 SG	203	static const uint8_t port_mapping[] = {
	204	0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
	205	};
	206
af4872fb	207	int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
2405fc97	208	{
3bc34a61 RZ	209	if (audmux_type != IMX21_AUDMUX)
	210	return -EINVAL;
	211
2405fc97 SG	212	if (!audmux_base)
	213	return -ENOSYS;
	214
	215	if (port >= ARRAY_SIZE(port_mapping))
	216	return -EINVAL;
	217
	218	writel(pcr, audmux_base + port_mapping[port]);
	219
	220	return 0;
	221	}
af4872fb	222	EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
2405fc97	223
af4872fb	224	int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
9eedbdf1 SH	225	unsigned int pdcr)
9eedbdf1 SH	226	{
3bc34a61 RZ	227	if (audmux_type != IMX31_AUDMUX)
	228	return -EINVAL;
	229
9eedbdf1 SH	230	if (!audmux_base)
	231	return -ENOSYS;
	232
	233	if (audmux_clk)
bac59328	234	clk_prepare_enable(audmux_clk);
9eedbdf1	235
af4872fb SG	236	writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
af4872fb SG	237	writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
9eedbdf1 SH	238
9eedbdf1 SH	239	if (audmux_clk)
bac59328	240	clk_disable_unprepare(audmux_clk);
9eedbdf1 SH	241
	242	return 0;
	243	}
af4872fb	244	EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
9eedbdf1	245
a0a3d518	246	static int imx_audmux_probe(struct platform_device *pdev)
9eedbdf1	247	{
3bc34a61	248	struct resource *res;
9d5ef266 RZ	249	const struct of_device_id *of_id =
9d5ef266 RZ	250	of_match_device(imx_audmux_dt_ids, &pdev->dev);
3bc34a61 RZ	251
3bc34a61 RZ	252	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
b25b5aa0 TR	253	audmux_base = devm_ioremap_resource(&pdev->dev, res);
	254	if (IS_ERR(audmux_base))
	255	return PTR_ERR(audmux_base);
3bc34a61	256
127c5cad	257	audmux_clk = devm_clk_get(&pdev->dev, "audmux");
3bc34a61 RZ	258	if (IS_ERR(audmux_clk)) {
	259	dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
	260	PTR_ERR(audmux_clk));
	261	audmux_clk = NULL;
8402ed30	262	}
56c6b872	263
9d5ef266 RZ	264	if (of_id)
9d5ef266 RZ	265	pdev->id_entry = of_id->data;
3bc34a61 RZ	266	audmux_type = pdev->id_entry->driver_data;
3bc34a61 RZ	267	if (audmux_type == IMX31_AUDMUX)
2405fc97	268	audmux_debugfs_init();
7b4e08a7	269
9eedbdf1 SH	270	return 0;
	271	}
	272
a0a3d518	273	static int imx_audmux_remove(struct platform_device *pdev)
3bc34a61 RZ	274	{
	275	if (audmux_type == IMX31_AUDMUX)
	276	audmux_debugfs_remove();
3bc34a61 RZ	277
	278	return 0;
	279	}
	280
	281	static struct platform_driver imx_audmux_driver = {
	282	.probe = imx_audmux_probe,
a0a3d518	283	.remove = imx_audmux_remove,
3bc34a61 RZ	284	.id_table = imx_audmux_ids,
	285	.driver = {
	286	.name = DRIVER_NAME,
	287	.owner = THIS_MODULE,
9d5ef266	288	.of_match_table = imx_audmux_dt_ids,
3bc34a61 RZ	289	}
	290	};
	291
	292	static int __init imx_audmux_init(void)
	293	{
	294	return platform_driver_register(&imx_audmux_driver);
	295	}
	296	subsys_initcall(imx_audmux_init);
	297
	298	static void __exit imx_audmux_exit(void)
	299	{
	300	platform_driver_unregister(&imx_audmux_driver);
	301	}
	302	module_exit(imx_audmux_exit);
	303
	304	MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
	305	MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
	306	MODULE_LICENSE("GPL v2");
	307	MODULE_ALIAS("platform:" DRIVER_NAME);