[linux-block.git] / arch / arm / plat-mxc / audmux-v2.c

/*
 * 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/module.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <mach/audmux.h>
#include <mach/hardware.h>

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

#define MXC_AUDMUX_V2_PTCR(x)		((x) * 8)
#define MXC_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 + MXC_AUDMUX_V2_PTCR(port));
	pdcr = readl(audmux_base + MXC_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 & MXC_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 & MXC_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 & MXC_AUDMUX_V2_PTCR_SYN) {
		ret += snprintf(buf + ret, PAGE_SIZE - ret,
				"Port is symmetric");
	} else {
		if (ptcr & MXC_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 & MXC_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 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);
	}
}
#else
static inline void audmux_debugfs_init(void)
{
}
#endif

int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
		unsigned int pdcr)
{
	if (!audmux_base)
		return -ENOSYS;

	if (audmux_clk)
		clk_enable(audmux_clk);

	writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port));
	writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port));

	if (audmux_clk)
		clk_disable(audmux_clk);

	return 0;
}
EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port);

static int mxc_audmux_v2_init(void)
{
	int ret;

#if defined(CONFIG_ARCH_MX3)
	if (cpu_is_mx31())
		audmux_base = MX31_IO_ADDRESS(MX31_AUDMUX_BASE_ADDR);

	else if (cpu_is_mx35()) {
		audmux_clk = clk_get(NULL, "audmux");
		if (IS_ERR(audmux_clk)) {
			ret = PTR_ERR(audmux_clk);
			printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
					ret);
			return ret;
		}
		audmux_base = MX35_IO_ADDRESS(MX35_AUDMUX_BASE_ADDR);
	}
#endif
#if defined(CONFIG_ARCH_MX25)
	if (cpu_is_mx25()) {
		audmux_clk = clk_get(NULL, "audmux");
		if (IS_ERR(audmux_clk)) {
			ret = PTR_ERR(audmux_clk);
			printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
					ret);
			return ret;
		}
		audmux_base = MX25_IO_ADDRESS(MX25_AUDMUX_BASE_ADDR);
	}
#endif
	audmux_debugfs_init();

	return 0;
}

postcore_initcall(mxc_audmux_v2_init);
Commit	Line	Data
9eedbdf1 SH	1	/*
	2	* Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
	3	*
	4	* Initial development of this code was funded by
	5	* Phytec Messtechnik GmbH, http://www.phytec.de
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
9eedbdf1 SH	16	*/
	17
	18	#include <linux/module.h>
	19	#include <linux/err.h>
	20	#include <linux/io.h>
	21	#include <linux/clk.h>
7b4e08a7	22	#include <linux/debugfs.h>
5a0e3ad6	23	#include <linux/slab.h>
9eedbdf1 SH	24	#include <mach/audmux.h>
	25	#include <mach/hardware.h>
	26
	27	static struct clk *audmux_clk;
	28	static void __iomem *audmux_base;
	29
	30	#define MXC_AUDMUX_V2_PTCR(x) ((x) * 8)
	31	#define MXC_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
	32
7b4e08a7 MB	33	#ifdef CONFIG_DEBUG_FS
	34	static struct dentry *audmux_debugfs_root;
	35
	36	static int audmux_open_file(struct inode inode, struct file file)
	37	{
	38	file->private_data = inode->i_private;
	39	return 0;
	40	}
	41
	42	/* There is an annoying discontinuity in the SSI numbering with regard
	43	* to the Linux number of the devices */
	44	static const char *audmux_port_string(int port)
	45	{
	46	switch (port) {
	47	case MX31_AUDMUX_PORT1_SSI0:
	48	return "imx-ssi.0";
	49	case MX31_AUDMUX_PORT2_SSI1:
	50	return "imx-ssi.1";
	51	case MX31_AUDMUX_PORT3_SSI_PINS_3:
	52	return "SSI3";
	53	case MX31_AUDMUX_PORT4_SSI_PINS_4:
	54	return "SSI4";
	55	case MX31_AUDMUX_PORT5_SSI_PINS_5:
	56	return "SSI5";
	57	case MX31_AUDMUX_PORT6_SSI_PINS_6:
	58	return "SSI6";
	59	default:
	60	return "UNKNOWN";
	61	}
	62	}
	63
	64	static ssize_t audmux_read_file(struct file file, char __user user_buf,
	65	size_t count, loff_t *ppos)
	66	{
	67	ssize_t ret;
	68	char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	69	int port = (int)file->private_data;
	70	u32 pdcr, ptcr;
	71
	72	if (!buf)
	73	return -ENOMEM;
	74
	75	if (audmux_clk)
	76	clk_enable(audmux_clk);
	77
	78	ptcr = readl(audmux_base + MXC_AUDMUX_V2_PTCR(port));
	79	pdcr = readl(audmux_base + MXC_AUDMUX_V2_PDCR(port));
	80
	81	if (audmux_clk)
	82	clk_disable(audmux_clk);
	83
	84	ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
	85	pdcr, ptcr);
	86
	87	if (ptcr & MXC_AUDMUX_V2_PTCR_TFSDIR)
	88	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	89	"TxFS output from %s, ",
	90	audmux_port_string((ptcr >> 27) & 0x7));
	91	else
	92	ret += snprintf(buf + ret, PAGE_SIZE - ret,
	93	"TxFS input, ");
	94
	95	if (ptcr & MXC_AUDMUX_V2_PTCR_TCLKDIR)
	96	ret += snprintf(buf + ret, PAGE_SIZE - ret,
97	"TxClk output from %s",
98	audmux_port_string((ptcr >> 22) & 0x7));
99	else
100	ret += snprintf(buf + ret, PAGE_SIZE - ret,
101	"TxClk input");
102
103	ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
104
105	if (ptcr & MXC_AUDMUX_V2_PTCR_SYN) {
106	ret += snprintf(buf + ret, PAGE_SIZE - ret,
107	"Port is symmetric");
108	} else {
109	if (ptcr & MXC_AUDMUX_V2_PTCR_RFSDIR)
110	ret += snprintf(buf + ret, PAGE_SIZE - ret,
111	"RxFS output from %s, ",
112	audmux_port_string((ptcr >> 17) & 0x7));
113	else
114	ret += snprintf(buf + ret, PAGE_SIZE - ret,
115	"RxFS input, ");
116
117	if (ptcr & MXC_AUDMUX_V2_PTCR_RCLKDIR)
118	ret += snprintf(buf + ret, PAGE_SIZE - ret,
119	"RxClk output from %s",
120	audmux_port_string((ptcr >> 12) & 0x7));
121	else
122	ret += snprintf(buf + ret, PAGE_SIZE - ret,
123	"RxClk input");
124	}
125
126	ret += snprintf(buf + ret, PAGE_SIZE - ret,
127	"\nData received from %s\n",
128	audmux_port_string((pdcr >> 13) & 0x7));
129
130	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
131
132	kfree(buf);
133
134	return ret;
135	}
136
137	static const struct file_operations audmux_debugfs_fops = {
138	.open = audmux_open_file,
139	.read = audmux_read_file,
6038f373	140	.llseek = default_llseek,
7b4e08a7 MB	141	};
	142
	143	static void audmux_debugfs_init(void)
	144	{
	145	int i;
	146	char buf[20];
	147
	148	audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
	149	if (!audmux_debugfs_root) {
	150	pr_warning("Failed to create AUDMUX debugfs root\n");
	151	return;
	152	}
	153
	154	for (i = 1; i < 8; i++) {
	155	snprintf(buf, sizeof(buf), "ssi%d", i);
	156	if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
	157	(void *)i, &audmux_debugfs_fops))
	158	pr_warning("Failed to create AUDMUX port %d debugfs file\n",
	159	i);
	160	}
	161	}
	162	#else
	163	static inline void audmux_debugfs_init(void)
	164	{
	165	}
	166	#endif
	167
9eedbdf1 SH	168	int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
	169	unsigned int pdcr)
	170	{
	171	if (!audmux_base)
	172	return -ENOSYS;
	173
	174	if (audmux_clk)
	175	clk_enable(audmux_clk);
	176
	177	writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port));
	178	writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port));
	179
	180	if (audmux_clk)
	181	clk_disable(audmux_clk);
	182
	183	return 0;
	184	}
	185	EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port);
	186
	187	static int mxc_audmux_v2_init(void)
	188	{
	189	int ret;
	190
8402ed30	191	#if defined(CONFIG_ARCH_MX3)
8e998058 UKK	192	if (cpu_is_mx31())
	193	audmux_base = MX31_IO_ADDRESS(MX31_AUDMUX_BASE_ADDR);
	194
	195	else if (cpu_is_mx35()) {
9eedbdf1 SH	196	audmux_clk = clk_get(NULL, "audmux");
	197	if (IS_ERR(audmux_clk)) {
	198	ret = PTR_ERR(audmux_clk);
	199	printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
	200	ret);
	201	return ret;
	202	}
8e998058	203	audmux_base = MX35_IO_ADDRESS(MX35_AUDMUX_BASE_ADDR);
9eedbdf1	204	}
8402ed30 EB	205	#endif
	206	#if defined(CONFIG_ARCH_MX25)
	207	if (cpu_is_mx25()) {
	208	audmux_clk = clk_get(NULL, "audmux");
	209	if (IS_ERR(audmux_clk)) {
	210	ret = PTR_ERR(audmux_clk);
	211	printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
	212	ret);
	213	return ret;
	214	}
	215	audmux_base = MX25_IO_ADDRESS(MX25_AUDMUX_BASE_ADDR);
	216	}
	217	#endif
7b4e08a7 MB	218	audmux_debugfs_init();
7b4e08a7 MB	219
9eedbdf1 SH	220	return 0;
	221	}
	222
	223	postcore_initcall(mxc_audmux_v2_init);