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. | |
16 | * | |
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. | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/err.h> | |
24 | #include <linux/io.h> | |
25 | #include <linux/clk.h> | |
7b4e08a7 | 26 | #include <linux/debugfs.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
9eedbdf1 SH |
28 | #include <mach/audmux.h> |
29 | #include <mach/hardware.h> | |
30 | ||
31 | static struct clk *audmux_clk; | |
32 | static void __iomem *audmux_base; | |
33 | ||
34 | #define MXC_AUDMUX_V2_PTCR(x) ((x) * 8) | |
35 | #define MXC_AUDMUX_V2_PDCR(x) ((x) * 8 + 4) | |
36 | ||
7b4e08a7 MB |
37 | #ifdef CONFIG_DEBUG_FS |
38 | static struct dentry *audmux_debugfs_root; | |
39 | ||
40 | static int audmux_open_file(struct inode *inode, struct file *file) | |
41 | { | |
42 | file->private_data = inode->i_private; | |
43 | return 0; | |
44 | } | |
45 | ||
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) | |
49 | { | |
50 | switch (port) { | |
51 | case MX31_AUDMUX_PORT1_SSI0: | |
52 | return "imx-ssi.0"; | |
53 | case MX31_AUDMUX_PORT2_SSI1: | |
54 | return "imx-ssi.1"; | |
55 | case MX31_AUDMUX_PORT3_SSI_PINS_3: | |
56 | return "SSI3"; | |
57 | case MX31_AUDMUX_PORT4_SSI_PINS_4: | |
58 | return "SSI4"; | |
59 | case MX31_AUDMUX_PORT5_SSI_PINS_5: | |
60 | return "SSI5"; | |
61 | case MX31_AUDMUX_PORT6_SSI_PINS_6: | |
62 | return "SSI6"; | |
63 | default: | |
64 | return "UNKNOWN"; | |
65 | } | |
66 | } | |
67 | ||
68 | static ssize_t audmux_read_file(struct file *file, char __user *user_buf, | |
69 | size_t count, loff_t *ppos) | |
70 | { | |
71 | ssize_t ret; | |
72 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
73 | int port = (int)file->private_data; | |
74 | u32 pdcr, ptcr; | |
75 | ||
76 | if (!buf) | |
77 | return -ENOMEM; | |
78 | ||
79 | if (audmux_clk) | |
80 | clk_enable(audmux_clk); | |
81 | ||
82 | ptcr = readl(audmux_base + MXC_AUDMUX_V2_PTCR(port)); | |
83 | pdcr = readl(audmux_base + MXC_AUDMUX_V2_PDCR(port)); | |
84 | ||
85 | if (audmux_clk) | |
86 | clk_disable(audmux_clk); | |
87 | ||
88 | ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n", | |
89 | pdcr, ptcr); | |
90 | ||
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)); | |
95 | else | |
96 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
97 | "TxFS input, "); | |
98 | ||
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)); | |
103 | else | |
104 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
105 | "TxClk input"); | |
106 | ||
107 | ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n"); | |
108 | ||
109 | if (ptcr & MXC_AUDMUX_V2_PTCR_SYN) { | |
110 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
111 | "Port is symmetric"); | |
112 | } else { | |
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)); | |
117 | else | |
118 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
119 | "RxFS input, "); | |
120 | ||
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)); | |
125 | else | |
126 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
127 | "RxClk input"); | |
128 | } | |
129 | ||
130 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
131 | "\nData received from %s\n", | |
132 | audmux_port_string((pdcr >> 13) & 0x7)); | |
133 | ||
134 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
135 | ||
136 | kfree(buf); | |
137 | ||
138 | return ret; | |
139 | } | |
140 | ||
141 | static const struct file_operations audmux_debugfs_fops = { | |
142 | .open = audmux_open_file, | |
143 | .read = audmux_read_file, | |
144 | }; | |
145 | ||
146 | static void audmux_debugfs_init(void) | |
147 | { | |
148 | int i; | |
149 | char buf[20]; | |
150 | ||
151 | audmux_debugfs_root = debugfs_create_dir("audmux", NULL); | |
152 | if (!audmux_debugfs_root) { | |
153 | pr_warning("Failed to create AUDMUX debugfs root\n"); | |
154 | return; | |
155 | } | |
156 | ||
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", | |
162 | i); | |
163 | } | |
164 | } | |
165 | #else | |
166 | static inline void audmux_debugfs_init(void) | |
167 | { | |
168 | } | |
169 | #endif | |
170 | ||
9eedbdf1 SH |
171 | int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr, |
172 | unsigned int pdcr) | |
173 | { | |
174 | if (!audmux_base) | |
175 | return -ENOSYS; | |
176 | ||
177 | if (audmux_clk) | |
178 | clk_enable(audmux_clk); | |
179 | ||
180 | writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port)); | |
181 | writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port)); | |
182 | ||
183 | if (audmux_clk) | |
184 | clk_disable(audmux_clk); | |
185 | ||
186 | return 0; | |
187 | } | |
188 | EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port); | |
189 | ||
190 | static int mxc_audmux_v2_init(void) | |
191 | { | |
192 | int ret; | |
193 | ||
8e998058 UKK |
194 | if (cpu_is_mx31()) |
195 | audmux_base = MX31_IO_ADDRESS(MX31_AUDMUX_BASE_ADDR); | |
196 | ||
197 | else if (cpu_is_mx35()) { | |
9eedbdf1 SH |
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__, | |
202 | ret); | |
203 | return ret; | |
204 | } | |
8e998058 | 205 | audmux_base = MX35_IO_ADDRESS(MX35_AUDMUX_BASE_ADDR); |
9eedbdf1 SH |
206 | } |
207 | ||
7b4e08a7 MB |
208 | audmux_debugfs_init(); |
209 | ||
9eedbdf1 SH |
210 | return 0; |
211 | } | |
212 | ||
213 | postcore_initcall(mxc_audmux_v2_init); |