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.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <linux/module.h>
23 #include <linux/err.h>
25 #include <linux/clk.h>
26 #include <linux/debugfs.h>
27 #include <linux/slab.h>
28 #include <mach/audmux.h>
29 #include <mach/hardware.h>
31 static struct clk *audmux_clk;
32 static void __iomem *audmux_base;
34 #define MXC_AUDMUX_V2_PTCR(x) ((x) * 8)
35 #define MXC_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
37 #ifdef CONFIG_DEBUG_FS
38 static struct dentry *audmux_debugfs_root;
40 static int audmux_open_file(struct inode *inode, struct file *file)
42 file->private_data = inode->i_private;
46 /* There is an annoying discontinuity in the SSI numbering with regard
47 * to the Linux number of the devices */
48 static const char *audmux_port_string(int port)
51 case MX31_AUDMUX_PORT1_SSI0:
53 case MX31_AUDMUX_PORT2_SSI1:
55 case MX31_AUDMUX_PORT3_SSI_PINS_3:
57 case MX31_AUDMUX_PORT4_SSI_PINS_4:
59 case MX31_AUDMUX_PORT5_SSI_PINS_5:
61 case MX31_AUDMUX_PORT6_SSI_PINS_6:
68 static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
69 size_t count, loff_t *ppos)
72 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
73 int port = (int)file->private_data;
80 clk_enable(audmux_clk);
82 ptcr = readl(audmux_base + MXC_AUDMUX_V2_PTCR(port));
83 pdcr = readl(audmux_base + MXC_AUDMUX_V2_PDCR(port));
86 clk_disable(audmux_clk);
88 ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
91 if (ptcr & MXC_AUDMUX_V2_PTCR_TFSDIR)
92 ret += snprintf(buf + ret, PAGE_SIZE - ret,
93 "TxFS output from %s, ",
94 audmux_port_string((ptcr >> 27) & 0x7));
96 ret += snprintf(buf + ret, PAGE_SIZE - ret,
99 if (ptcr & MXC_AUDMUX_V2_PTCR_TCLKDIR)
100 ret += snprintf(buf + ret, PAGE_SIZE - ret,
101 "TxClk output from %s",
102 audmux_port_string((ptcr >> 22) & 0x7));
104 ret += snprintf(buf + ret, PAGE_SIZE - ret,
107 ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
109 if (ptcr & MXC_AUDMUX_V2_PTCR_SYN) {
110 ret += snprintf(buf + ret, PAGE_SIZE - ret,
111 "Port is symmetric");
113 if (ptcr & MXC_AUDMUX_V2_PTCR_RFSDIR)
114 ret += snprintf(buf + ret, PAGE_SIZE - ret,
115 "RxFS output from %s, ",
116 audmux_port_string((ptcr >> 17) & 0x7));
118 ret += snprintf(buf + ret, PAGE_SIZE - ret,
121 if (ptcr & MXC_AUDMUX_V2_PTCR_RCLKDIR)
122 ret += snprintf(buf + ret, PAGE_SIZE - ret,
123 "RxClk output from %s",
124 audmux_port_string((ptcr >> 12) & 0x7));
126 ret += snprintf(buf + ret, PAGE_SIZE - ret,
130 ret += snprintf(buf + ret, PAGE_SIZE - ret,
131 "\nData received from %s\n",
132 audmux_port_string((pdcr >> 13) & 0x7));
134 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
141 static const struct file_operations audmux_debugfs_fops = {
142 .open = audmux_open_file,
143 .read = audmux_read_file,
146 static void audmux_debugfs_init(void)
151 audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
152 if (!audmux_debugfs_root) {
153 pr_warning("Failed to create AUDMUX debugfs root\n");
157 for (i = 1; i < 8; i++) {
158 snprintf(buf, sizeof(buf), "ssi%d", i);
159 if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
160 (void *)i, &audmux_debugfs_fops))
161 pr_warning("Failed to create AUDMUX port %d debugfs file\n",
166 static inline void audmux_debugfs_init(void)
171 int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
178 clk_enable(audmux_clk);
180 writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port));
181 writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port));
184 clk_disable(audmux_clk);
188 EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port);
190 static int mxc_audmux_v2_init(void)
195 audmux_base = MX31_IO_ADDRESS(MX31_AUDMUX_BASE_ADDR);
197 else if (cpu_is_mx35()) {
198 audmux_clk = clk_get(NULL, "audmux");
199 if (IS_ERR(audmux_clk)) {
200 ret = PTR_ERR(audmux_clk);
201 printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
205 audmux_base = MX35_IO_ADDRESS(MX35_AUDMUX_BASE_ADDR);
208 audmux_debugfs_init();
213 postcore_initcall(mxc_audmux_v2_init);