1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/*
* Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
*
* Initial development of this code was funded by
* Phytec Messtechnik GmbH, http://www.phytec.de
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <mach/audmux.h>
#include <mach/hardware.h>
static struct clk *audmux_clk;
static void __iomem *audmux_base;
#define MXC_AUDMUX_V2_PTCR(x) ((x) * 8)
#define MXC_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
#ifdef CONFIG_DEBUG_FS
static struct dentry *audmux_debugfs_root;
static int audmux_open_file(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}
/* There is an annoying discontinuity in the SSI numbering with regard
* to the Linux number of the devices */
static const char *audmux_port_string(int port)
{
switch (port) {
case MX31_AUDMUX_PORT1_SSI0:
return "imx-ssi.0";
case MX31_AUDMUX_PORT2_SSI1:
return "imx-ssi.1";
case MX31_AUDMUX_PORT3_SSI_PINS_3:
return "SSI3";
case MX31_AUDMUX_PORT4_SSI_PINS_4:
return "SSI4";
case MX31_AUDMUX_PORT5_SSI_PINS_5:
return "SSI5";
case MX31_AUDMUX_PORT6_SSI_PINS_6:
return "SSI6";
default:
return "UNKNOWN";
}
}
static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
ssize_t ret;
char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
int port = (int)file->private_data;
u32 pdcr, ptcr;
if (!buf)
return -ENOMEM;
if (audmux_clk)
clk_enable(audmux_clk);
ptcr = readl(audmux_base + MXC_AUDMUX_V2_PTCR(port));
pdcr = readl(audmux_base + MXC_AUDMUX_V2_PDCR(port));
if (audmux_clk)
clk_disable(audmux_clk);
ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
pdcr, ptcr);
if (ptcr & MXC_AUDMUX_V2_PTCR_TFSDIR)
ret += snprintf(buf + ret, PAGE_SIZE - ret,
"TxFS output from %s, ",
audmux_port_string((ptcr >> 27) & 0x7));
else
ret += snprintf(buf + ret, PAGE_SIZE - ret,
"TxFS input, ");
if (ptcr & MXC_AUDMUX_V2_PTCR_TCLKDIR)
ret += snprintf(buf + ret, PAGE_SIZE - ret,
"TxClk output from %s",
audmux_port_string((ptcr >> 22) & 0x7));
else
ret += snprintf(buf + ret, PAGE_SIZE - ret,
"TxClk input");
ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
if (ptcr & MXC_AUDMUX_V2_PTCR_SYN) {
ret += snprintf(buf + ret, PAGE_SIZE - ret,
"Port is symmetric");
} else {
if (ptcr & MXC_AUDMUX_V2_PTCR_RFSDIR)
ret += snprintf(buf + ret, PAGE_SIZE - ret,
"RxFS output from %s, ",
audmux_port_string((ptcr >> 17) & 0x7));
else
ret += snprintf(buf + ret, PAGE_SIZE - ret,
"RxFS input, ");
if (ptcr & MXC_AUDMUX_V2_PTCR_RCLKDIR)
ret += snprintf(buf + ret, PAGE_SIZE - ret,
"RxClk output from %s",
audmux_port_string((ptcr >> 12) & 0x7));
else
ret += snprintf(buf + ret, PAGE_SIZE - ret,
"RxClk input");
}
ret += snprintf(buf + ret, PAGE_SIZE - ret,
"\nData received from %s\n",
audmux_port_string((pdcr >> 13) & 0x7));
ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
kfree(buf);
return ret;
}
static const struct file_operations audmux_debugfs_fops = {
.open = audmux_open_file,
.read = audmux_read_file,
};
static void audmux_debugfs_init(void)
{
int i;
char buf[20];
audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
if (!audmux_debugfs_root) {
pr_warning("Failed to create AUDMUX debugfs root\n");
return;
}
for (i = 1; i < 8; i++) {
snprintf(buf, sizeof(buf), "ssi%d", i);
if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
(void *)i, &audmux_debugfs_fops))
pr_warning("Failed to create AUDMUX port %d debugfs file\n",
i);
}
}
#else
static inline void audmux_debugfs_init(void)
{
}
#endif
int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
unsigned int pdcr)
{
if (!audmux_base)
return -ENOSYS;
if (audmux_clk)
clk_enable(audmux_clk);
writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port));
writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port));
if (audmux_clk)
clk_disable(audmux_clk);
return 0;
}
EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port);
static int mxc_audmux_v2_init(void)
{
int ret;
#if defined(CONFIG_ARCH_MX3)
if (cpu_is_mx31())
audmux_base = MX31_IO_ADDRESS(MX31_AUDMUX_BASE_ADDR);
else if (cpu_is_mx35()) {
audmux_clk = clk_get(NULL, "audmux");
if (IS_ERR(audmux_clk)) {
ret = PTR_ERR(audmux_clk);
printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
ret);
return ret;
}
audmux_base = MX35_IO_ADDRESS(MX35_AUDMUX_BASE_ADDR);
}
#endif
#if defined(CONFIG_ARCH_MX25)
if (cpu_is_mx25()) {
audmux_clk = clk_get(NULL, "audmux");
if (IS_ERR(audmux_clk)) {
ret = PTR_ERR(audmux_clk);
printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
ret);
return ret;
}
audmux_base = MX25_IO_ADDRESS(MX25_AUDMUX_BASE_ADDR);
}
#endif
audmux_debugfs_init();
return 0;
}
postcore_initcall(mxc_audmux_v2_init);
|
