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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. | |
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> |
9eedbdf1 SH |
27 | #include <mach/audmux.h> |
28 | #include <mach/hardware.h> | |
29 | ||
30 | static struct clk *audmux_clk; | |
31 | static void __iomem *audmux_base; | |
32 | ||
33 | #define MXC_AUDMUX_V2_PTCR(x) ((x) * 8) | |
34 | #define MXC_AUDMUX_V2_PDCR(x) ((x) * 8 + 4) | |
35 | ||
7b4e08a7 MB |
36 | #ifdef CONFIG_DEBUG_FS |
37 | static struct dentry *audmux_debugfs_root; | |
38 | ||
39 | static int audmux_open_file(struct inode *inode, struct file *file) | |
40 | { | |
41 | file->private_data = inode->i_private; | |
42 | return 0; | |
43 | } | |
44 | ||
45 | /* There is an annoying discontinuity in the SSI numbering with regard | |
46 | * to the Linux number of the devices */ | |
47 | static const char *audmux_port_string(int port) | |
48 | { | |
49 | switch (port) { | |
50 | case MX31_AUDMUX_PORT1_SSI0: | |
51 | return "imx-ssi.0"; | |
52 | case MX31_AUDMUX_PORT2_SSI1: | |
53 | return "imx-ssi.1"; | |
54 | case MX31_AUDMUX_PORT3_SSI_PINS_3: | |
55 | return "SSI3"; | |
56 | case MX31_AUDMUX_PORT4_SSI_PINS_4: | |
57 | return "SSI4"; | |
58 | case MX31_AUDMUX_PORT5_SSI_PINS_5: | |
59 | return "SSI5"; | |
60 | case MX31_AUDMUX_PORT6_SSI_PINS_6: | |
61 | return "SSI6"; | |
62 | default: | |
63 | return "UNKNOWN"; | |
64 | } | |
65 | } | |
66 | ||
67 | static ssize_t audmux_read_file(struct file *file, char __user *user_buf, | |
68 | size_t count, loff_t *ppos) | |
69 | { | |
70 | ssize_t ret; | |
71 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
72 | int port = (int)file->private_data; | |
73 | u32 pdcr, ptcr; | |
74 | ||
75 | if (!buf) | |
76 | return -ENOMEM; | |
77 | ||
78 | if (audmux_clk) | |
79 | clk_enable(audmux_clk); | |
80 | ||
81 | ptcr = readl(audmux_base + MXC_AUDMUX_V2_PTCR(port)); | |
82 | pdcr = readl(audmux_base + MXC_AUDMUX_V2_PDCR(port)); | |
83 | ||
84 | if (audmux_clk) | |
85 | clk_disable(audmux_clk); | |
86 | ||
87 | ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n", | |
88 | pdcr, ptcr); | |
89 | ||
90 | if (ptcr & MXC_AUDMUX_V2_PTCR_TFSDIR) | |
91 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
92 | "TxFS output from %s, ", | |
93 | audmux_port_string((ptcr >> 27) & 0x7)); | |
94 | else | |
95 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
96 | "TxFS input, "); | |
97 | ||
98 | if (ptcr & MXC_AUDMUX_V2_PTCR_TCLKDIR) | |
99 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
100 | "TxClk output from %s", | |
101 | audmux_port_string((ptcr >> 22) & 0x7)); | |
102 | else | |
103 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
104 | "TxClk input"); | |
105 | ||
106 | ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n"); | |
107 | ||
108 | if (ptcr & MXC_AUDMUX_V2_PTCR_SYN) { | |
109 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
110 | "Port is symmetric"); | |
111 | } else { | |
112 | if (ptcr & MXC_AUDMUX_V2_PTCR_RFSDIR) | |
113 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
114 | "RxFS output from %s, ", | |
115 | audmux_port_string((ptcr >> 17) & 0x7)); | |
116 | else | |
117 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
118 | "RxFS input, "); | |
119 | ||
120 | if (ptcr & MXC_AUDMUX_V2_PTCR_RCLKDIR) | |
121 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
122 | "RxClk output from %s", | |
123 | audmux_port_string((ptcr >> 12) & 0x7)); | |
124 | else | |
125 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
126 | "RxClk input"); | |
127 | } | |
128 | ||
129 | ret += snprintf(buf + ret, PAGE_SIZE - ret, | |
130 | "\nData received from %s\n", | |
131 | audmux_port_string((pdcr >> 13) & 0x7)); | |
132 | ||
133 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
134 | ||
135 | kfree(buf); | |
136 | ||
137 | return ret; | |
138 | } | |
139 | ||
140 | static const struct file_operations audmux_debugfs_fops = { | |
141 | .open = audmux_open_file, | |
142 | .read = audmux_read_file, | |
143 | }; | |
144 | ||
145 | static void audmux_debugfs_init(void) | |
146 | { | |
147 | int i; | |
148 | char buf[20]; | |
149 | ||
150 | audmux_debugfs_root = debugfs_create_dir("audmux", NULL); | |
151 | if (!audmux_debugfs_root) { | |
152 | pr_warning("Failed to create AUDMUX debugfs root\n"); | |
153 | return; | |
154 | } | |
155 | ||
156 | for (i = 1; i < 8; i++) { | |
157 | snprintf(buf, sizeof(buf), "ssi%d", i); | |
158 | if (!debugfs_create_file(buf, 0444, audmux_debugfs_root, | |
159 | (void *)i, &audmux_debugfs_fops)) | |
160 | pr_warning("Failed to create AUDMUX port %d debugfs file\n", | |
161 | i); | |
162 | } | |
163 | } | |
164 | #else | |
165 | static inline void audmux_debugfs_init(void) | |
166 | { | |
167 | } | |
168 | #endif | |
169 | ||
9eedbdf1 SH |
170 | int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr, |
171 | unsigned int pdcr) | |
172 | { | |
173 | if (!audmux_base) | |
174 | return -ENOSYS; | |
175 | ||
176 | if (audmux_clk) | |
177 | clk_enable(audmux_clk); | |
178 | ||
179 | writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port)); | |
180 | writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port)); | |
181 | ||
182 | if (audmux_clk) | |
183 | clk_disable(audmux_clk); | |
184 | ||
185 | return 0; | |
186 | } | |
187 | EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port); | |
188 | ||
189 | static int mxc_audmux_v2_init(void) | |
190 | { | |
191 | int ret; | |
192 | ||
193 | if (cpu_is_mx35()) { | |
194 | audmux_clk = clk_get(NULL, "audmux"); | |
195 | if (IS_ERR(audmux_clk)) { | |
196 | ret = PTR_ERR(audmux_clk); | |
197 | printk(KERN_ERR "%s: cannot get clock: %d\n", __func__, | |
198 | ret); | |
199 | return ret; | |
200 | } | |
201 | } | |
202 | ||
203 | if (cpu_is_mx31() || cpu_is_mx35()) | |
204 | audmux_base = IO_ADDRESS(AUDMUX_BASE_ADDR); | |
205 | ||
7b4e08a7 MB |
206 | audmux_debugfs_init(); |
207 | ||
9eedbdf1 SH |
208 | return 0; |
209 | } | |
210 | ||
211 | postcore_initcall(mxc_audmux_v2_init); |