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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; | |
40e2eda9 SH |
190 | #if defined(CONFIG_ARCH_MX5) |
191 | if (cpu_is_mx51()) { | |
192 | audmux_base = MX51_IO_ADDRESS(MX51_AUDMUX_BASE_ADDR); | |
193 | ret = 0; | |
194 | return ret; | |
195 | } | |
196 | #endif | |
8402ed30 | 197 | #if defined(CONFIG_ARCH_MX3) |
8e998058 UKK |
198 | if (cpu_is_mx31()) |
199 | audmux_base = MX31_IO_ADDRESS(MX31_AUDMUX_BASE_ADDR); | |
200 | ||
201 | else if (cpu_is_mx35()) { | |
9eedbdf1 SH |
202 | audmux_clk = clk_get(NULL, "audmux"); |
203 | if (IS_ERR(audmux_clk)) { | |
204 | ret = PTR_ERR(audmux_clk); | |
205 | printk(KERN_ERR "%s: cannot get clock: %d\n", __func__, | |
206 | ret); | |
207 | return ret; | |
208 | } | |
8e998058 | 209 | audmux_base = MX35_IO_ADDRESS(MX35_AUDMUX_BASE_ADDR); |
9eedbdf1 | 210 | } |
8402ed30 | 211 | #endif |
972cc482 | 212 | #if defined(CONFIG_SOC_IMX25) |
8402ed30 EB |
213 | if (cpu_is_mx25()) { |
214 | audmux_clk = clk_get(NULL, "audmux"); | |
215 | if (IS_ERR(audmux_clk)) { | |
216 | ret = PTR_ERR(audmux_clk); | |
217 | printk(KERN_ERR "%s: cannot get clock: %d\n", __func__, | |
218 | ret); | |
219 | return ret; | |
220 | } | |
221 | audmux_base = MX25_IO_ADDRESS(MX25_AUDMUX_BASE_ADDR); | |
222 | } | |
972cc482 | 223 | #endif /* if defined(CONFIG_SOC_IMX25) */ |
7b4e08a7 MB |
224 | audmux_debugfs_init(); |
225 | ||
9eedbdf1 SH |
226 | return 0; |
227 | } | |
228 | ||
229 | postcore_initcall(mxc_audmux_v2_init); |