2 * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
4 * Initial development of this code was funded by
5 * Phytec Messtechnik GmbH, http://www.phytec.de
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.
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.
18 #include <linux/module.h>
19 #include <linux/err.h>
21 #include <linux/clk.h>
22 #include <linux/debugfs.h>
23 #include <linux/slab.h>
24 #include <mach/audmux.h>
25 #include <mach/hardware.h>
27 static struct clk *audmux_clk;
28 static void __iomem *audmux_base;
30 #define MXC_AUDMUX_V2_PTCR(x) ((x) * 8)
31 #define MXC_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
33 #ifdef CONFIG_DEBUG_FS
34 static struct dentry *audmux_debugfs_root;
36 static int audmux_open_file(struct inode *inode, struct file *file)
38 file->private_data = inode->i_private;
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)
47 case MX31_AUDMUX_PORT1_SSI0:
48 return "imx-ssi-dai.0";
49 case MX31_AUDMUX_PORT2_SSI1:
50 return "imx-ssi-dai.1";
51 case MX31_AUDMUX_PORT3_SSI_PINS_3:
53 case MX31_AUDMUX_PORT4_SSI_PINS_4:
55 case MX31_AUDMUX_PORT5_SSI_PINS_5:
57 case MX31_AUDMUX_PORT6_SSI_PINS_6:
64 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
65 size_t count, loff_t *ppos)
68 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
69 int port = (int)file->private_data;
76 clk_enable(audmux_clk);
78 ptcr = readl(audmux_base + MXC_AUDMUX_V2_PTCR(port));
79 pdcr = readl(audmux_base + MXC_AUDMUX_V2_PDCR(port));
82 clk_disable(audmux_clk);
84 ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
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));
92 ret += snprintf(buf + ret, PAGE_SIZE - ret,
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));
100 ret += snprintf(buf + ret, PAGE_SIZE - ret,
103 ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
105 if (ptcr & MXC_AUDMUX_V2_PTCR_SYN) {
106 ret += snprintf(buf + ret, PAGE_SIZE - ret,
107 "Port is symmetric");
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));
114 ret += snprintf(buf + ret, PAGE_SIZE - ret,
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));
122 ret += snprintf(buf + ret, PAGE_SIZE - ret,
126 ret += snprintf(buf + ret, PAGE_SIZE - ret,
127 "\nData received from %s\n",
128 audmux_port_string((pdcr >> 13) & 0x7));
130 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
137 static const struct file_operations audmux_debugfs_fops = {
138 .open = audmux_open_file,
139 .read = audmux_read_file,
142 static void audmux_debugfs_init(void)
147 audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
148 if (!audmux_debugfs_root) {
149 pr_warning("Failed to create AUDMUX debugfs root\n");
153 for (i = 1; i < 8; i++) {
154 snprintf(buf, sizeof(buf), "ssi%d", i);
155 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
156 (void *)i, &audmux_debugfs_fops))
157 pr_warning("Failed to create AUDMUX port %d debugfs file\n",
162 static inline void audmux_debugfs_init(void)
167 int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
174 clk_enable(audmux_clk);
176 writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port));
177 writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port));
180 clk_disable(audmux_clk);
184 EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port);
186 static int mxc_audmux_v2_init(void)
190 #if defined(CONFIG_ARCH_MX3)
192 audmux_base = MX31_IO_ADDRESS(MX31_AUDMUX_BASE_ADDR);
194 else if (cpu_is_mx35()) {
195 audmux_clk = clk_get(NULL, "audmux");
196 if (IS_ERR(audmux_clk)) {
197 ret = PTR_ERR(audmux_clk);
198 printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
202 audmux_base = MX35_IO_ADDRESS(MX35_AUDMUX_BASE_ADDR);
205 #if defined(CONFIG_ARCH_MX25)
207 audmux_clk = clk_get(NULL, "audmux");
208 if (IS_ERR(audmux_clk)) {
209 ret = PTR_ERR(audmux_clk);
210 printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
214 audmux_base = MX25_IO_ADDRESS(MX25_AUDMUX_BASE_ADDR);
217 audmux_debugfs_init();
222 postcore_initcall(mxc_audmux_v2_init);