1 // SPDX-License-Identifier: GPL-2.0-only
2 // Copyright(c) 2017-2019 Intel Corporation.
3
4 #include <linux/device.h>
5 #include <linux/debugfs.h>
6 #include <linux/mod_devicetable.h>
7 #include <linux/pm_runtime.h>
8 #include <linux/slab.h>
9 #include <linux/soundwire/sdw.h>
10 #include <linux/soundwire/sdw_registers.h>
11 #include "bus.h"
12
13 static struct dentry *sdw_debugfs_root;
14
sdw_bus_debugfs_init(struct sdw_bus * bus)15 void sdw_bus_debugfs_init(struct sdw_bus *bus)
16 {
17 char name[16];
18
19 if (!sdw_debugfs_root)
20 return;
21
22 /* create the debugfs master-N */
23 snprintf(name, sizeof(name), "master-%d-%d", bus->controller_id, bus->link_id);
24 bus->debugfs = debugfs_create_dir(name, sdw_debugfs_root);
25 }
26
sdw_bus_debugfs_exit(struct sdw_bus * bus)27 void sdw_bus_debugfs_exit(struct sdw_bus *bus)
28 {
29 debugfs_remove_recursive(bus->debugfs);
30 }
31
32 #define RD_BUF (3 * PAGE_SIZE)
33
sdw_sprintf(struct sdw_slave * slave,char * buf,size_t pos,unsigned int reg)34 static ssize_t sdw_sprintf(struct sdw_slave *slave,
35 char *buf, size_t pos, unsigned int reg)
36 {
37 int value;
38
39 value = sdw_read_no_pm(slave, reg);
40
41 if (value < 0)
42 return scnprintf(buf + pos, RD_BUF - pos, "%3x\tXX\n", reg);
43 else
44 return scnprintf(buf + pos, RD_BUF - pos,
45 "%3x\t%2x\n", reg, value);
46 }
47
sdw_slave_reg_show(struct seq_file * s_file,void * data)48 static int sdw_slave_reg_show(struct seq_file *s_file, void *data)
49 {
50 struct sdw_slave *slave = s_file->private;
51 char *buf;
52 ssize_t ret;
53 int i, j;
54
55 buf = kzalloc(RD_BUF, GFP_KERNEL);
56 if (!buf)
57 return -ENOMEM;
58
59 ret = pm_runtime_get_sync(&slave->dev);
60 if (ret < 0 && ret != -EACCES) {
61 pm_runtime_put_noidle(&slave->dev);
62 kfree(buf);
63 return ret;
64 }
65
66 ret = scnprintf(buf, RD_BUF, "Register Value\n");
67
68 /* DP0 non-banked registers */
69 ret += scnprintf(buf + ret, RD_BUF - ret, "\nDP0\n");
70 for (i = SDW_DP0_INT; i <= SDW_DP0_PREPARECTRL; i++)
71 ret += sdw_sprintf(slave, buf, ret, i);
72
73 /* DP0 Bank 0 registers */
74 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank0\n");
75 ret += sdw_sprintf(slave, buf, ret, SDW_DP0_CHANNELEN);
76 for (i = SDW_DP0_SAMPLECTRL1; i <= SDW_DP0_LANECTRL; i++)
77 ret += sdw_sprintf(slave, buf, ret, i);
78
79 /* DP0 Bank 1 registers */
80 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank1\n");
81 ret += sdw_sprintf(slave, buf, ret,
82 SDW_DP0_CHANNELEN + SDW_BANK1_OFFSET);
83 for (i = SDW_DP0_SAMPLECTRL1 + SDW_BANK1_OFFSET;
84 i <= SDW_DP0_LANECTRL + SDW_BANK1_OFFSET; i++)
85 ret += sdw_sprintf(slave, buf, ret, i);
86
87 /* SCP registers */
88 ret += scnprintf(buf + ret, RD_BUF - ret, "\nSCP\n");
89 for (i = SDW_SCP_INT1; i <= SDW_SCP_BUS_CLOCK_BASE; i++)
90 ret += sdw_sprintf(slave, buf, ret, i);
91 for (i = SDW_SCP_DEVID_0; i <= SDW_SCP_DEVID_5; i++)
92 ret += sdw_sprintf(slave, buf, ret, i);
93 for (i = SDW_SCP_FRAMECTRL_B0; i <= SDW_SCP_BUSCLOCK_SCALE_B0; i++)
94 ret += sdw_sprintf(slave, buf, ret, i);
95 for (i = SDW_SCP_FRAMECTRL_B1; i <= SDW_SCP_BUSCLOCK_SCALE_B1; i++)
96 ret += sdw_sprintf(slave, buf, ret, i);
97 for (i = SDW_SCP_PHY_OUT_CTRL_0; i <= SDW_SCP_PHY_OUT_CTRL_7; i++)
98 ret += sdw_sprintf(slave, buf, ret, i);
99
100
101 /*
102 * SCP Bank 0/1 registers are read-only and cannot be
103 * retrieved from the Slave. The Master typically keeps track
104 * of the current frame size so the information can be found
105 * in other places
106 */
107
108 /* DP1..14 registers */
109 for (i = 1; SDW_VALID_PORT_RANGE(i); i++) {
110
111 /* DPi registers */
112 ret += scnprintf(buf + ret, RD_BUF - ret, "\nDP%d\n", i);
113 for (j = SDW_DPN_INT(i); j <= SDW_DPN_PREPARECTRL(i); j++)
114 ret += sdw_sprintf(slave, buf, ret, j);
115
116 /* DPi Bank0 registers */
117 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank0\n");
118 for (j = SDW_DPN_CHANNELEN_B0(i);
119 j <= SDW_DPN_LANECTRL_B0(i); j++)
120 ret += sdw_sprintf(slave, buf, ret, j);
121
122 /* DPi Bank1 registers */
123 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank1\n");
124 for (j = SDW_DPN_CHANNELEN_B1(i);
125 j <= SDW_DPN_LANECTRL_B1(i); j++)
126 ret += sdw_sprintf(slave, buf, ret, j);
127 }
128
129 seq_printf(s_file, "%s", buf);
130
131 pm_runtime_mark_last_busy(&slave->dev);
132 pm_runtime_put(&slave->dev);
133
134 kfree(buf);
135
136 return 0;
137 }
138 DEFINE_SHOW_ATTRIBUTE(sdw_slave_reg);
139
sdw_slave_debugfs_init(struct sdw_slave * slave)140 void sdw_slave_debugfs_init(struct sdw_slave *slave)
141 {
142 struct dentry *master;
143 struct dentry *d;
144 char name[32];
145
146 master = slave->bus->debugfs;
147
148 /* create the debugfs slave-name */
149 snprintf(name, sizeof(name), "%s", dev_name(&slave->dev));
150 d = debugfs_create_dir(name, master);
151
152 debugfs_create_file("registers", 0400, d, slave, &sdw_slave_reg_fops);
153
154 slave->debugfs = d;
155 }
156
sdw_slave_debugfs_exit(struct sdw_slave * slave)157 void sdw_slave_debugfs_exit(struct sdw_slave *slave)
158 {
159 debugfs_remove_recursive(slave->debugfs);
160 }
161
sdw_debugfs_init(void)162 void sdw_debugfs_init(void)
163 {
164 sdw_debugfs_root = debugfs_create_dir("soundwire", NULL);
165 }
166
sdw_debugfs_exit(void)167 void sdw_debugfs_exit(void)
168 {
169 debugfs_remove_recursive(sdw_debugfs_root);
170 }
171