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 | |
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(buf: name, size: sizeof(name), fmt: "master-%d-%d" , bus->controller_id, bus->link_id); |
24 | bus->debugfs = debugfs_create_dir(name, parent: sdw_debugfs_root); |
25 | } |
26 | |
27 | void sdw_bus_debugfs_exit(struct sdw_bus *bus) |
28 | { |
29 | debugfs_remove_recursive(dentry: bus->debugfs); |
30 | } |
31 | |
32 | #define RD_BUF (3 * PAGE_SIZE) |
33 | |
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, addr: reg); |
40 | |
41 | if (value < 0) |
42 | return scnprintf(buf: buf + pos, RD_BUF - pos, fmt: "%3x\tXX\n" , reg); |
43 | else |
44 | return scnprintf(buf: buf + pos, RD_BUF - pos, |
45 | fmt: "%3x\t%2x\n" , reg, value); |
46 | } |
47 | |
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(dev: &slave->dev); |
60 | if (ret < 0 && ret != -EACCES) { |
61 | pm_runtime_put_noidle(dev: &slave->dev); |
62 | kfree(objp: buf); |
63 | return ret; |
64 | } |
65 | |
66 | ret = scnprintf(buf, RD_BUF, fmt: "Register Value\n" ); |
67 | |
68 | /* DP0 non-banked registers */ |
69 | ret += scnprintf(buf: buf + ret, RD_BUF - ret, fmt: "\nDP0\n" ); |
70 | for (i = SDW_DP0_INT; i <= SDW_DP0_PREPARECTRL; i++) |
71 | ret += sdw_sprintf(slave, buf, pos: ret, reg: i); |
72 | |
73 | /* DP0 Bank 0 registers */ |
74 | ret += scnprintf(buf: buf + ret, RD_BUF - ret, fmt: "Bank0\n" ); |
75 | ret += sdw_sprintf(slave, buf, pos: ret, SDW_DP0_CHANNELEN); |
76 | for (i = SDW_DP0_SAMPLECTRL1; i <= SDW_DP0_LANECTRL; i++) |
77 | ret += sdw_sprintf(slave, buf, pos: ret, reg: i); |
78 | |
79 | /* DP0 Bank 1 registers */ |
80 | ret += scnprintf(buf: buf + ret, RD_BUF - ret, fmt: "Bank1\n" ); |
81 | ret += sdw_sprintf(slave, buf, pos: 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, pos: ret, reg: i); |
86 | |
87 | /* SCP registers */ |
88 | ret += scnprintf(buf: buf + ret, RD_BUF - ret, fmt: "\nSCP\n" ); |
89 | for (i = SDW_SCP_INT1; i <= SDW_SCP_BUS_CLOCK_BASE; i++) |
90 | ret += sdw_sprintf(slave, buf, pos: ret, reg: i); |
91 | for (i = SDW_SCP_DEVID_0; i <= SDW_SCP_DEVID_5; i++) |
92 | ret += sdw_sprintf(slave, buf, pos: ret, reg: i); |
93 | for (i = SDW_SCP_FRAMECTRL_B0; i <= SDW_SCP_BUSCLOCK_SCALE_B0; i++) |
94 | ret += sdw_sprintf(slave, buf, pos: ret, reg: i); |
95 | for (i = SDW_SCP_FRAMECTRL_B1; i <= SDW_SCP_BUSCLOCK_SCALE_B1; i++) |
96 | ret += sdw_sprintf(slave, buf, pos: ret, reg: i); |
97 | for (i = SDW_SCP_PHY_OUT_CTRL_0; i <= SDW_SCP_PHY_OUT_CTRL_7; i++) |
98 | ret += sdw_sprintf(slave, buf, pos: ret, reg: 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: buf + ret, RD_BUF - ret, fmt: "\nDP%d\n" , i); |
113 | for (j = SDW_DPN_INT(i); j <= SDW_DPN_PREPARECTRL(i); j++) |
114 | ret += sdw_sprintf(slave, buf, pos: ret, reg: j); |
115 | |
116 | /* DPi Bank0 registers */ |
117 | ret += scnprintf(buf: buf + ret, RD_BUF - ret, fmt: "Bank0\n" ); |
118 | for (j = SDW_DPN_CHANNELEN_B0(i); |
119 | j <= SDW_DPN_LANECTRL_B0(i); j++) |
120 | ret += sdw_sprintf(slave, buf, pos: ret, reg: j); |
121 | |
122 | /* DPi Bank1 registers */ |
123 | ret += scnprintf(buf: buf + ret, RD_BUF - ret, fmt: "Bank1\n" ); |
124 | for (j = SDW_DPN_CHANNELEN_B1(i); |
125 | j <= SDW_DPN_LANECTRL_B1(i); j++) |
126 | ret += sdw_sprintf(slave, buf, pos: ret, reg: j); |
127 | } |
128 | |
129 | seq_printf(m: s_file, fmt: "%s" , buf); |
130 | |
131 | pm_runtime_mark_last_busy(dev: &slave->dev); |
132 | pm_runtime_put(dev: &slave->dev); |
133 | |
134 | kfree(objp: buf); |
135 | |
136 | return 0; |
137 | } |
138 | DEFINE_SHOW_ATTRIBUTE(sdw_slave_reg); |
139 | |
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(buf: name, size: sizeof(name), fmt: "%s" , dev_name(dev: &slave->dev)); |
150 | d = debugfs_create_dir(name, parent: master); |
151 | |
152 | debugfs_create_file(name: "registers" , mode: 0400, parent: d, data: slave, fops: &sdw_slave_reg_fops); |
153 | |
154 | slave->debugfs = d; |
155 | } |
156 | |
157 | void sdw_slave_debugfs_exit(struct sdw_slave *slave) |
158 | { |
159 | debugfs_remove_recursive(dentry: slave->debugfs); |
160 | } |
161 | |
162 | void sdw_debugfs_init(void) |
163 | { |
164 | sdw_debugfs_root = debugfs_create_dir(name: "soundwire" , NULL); |
165 | } |
166 | |
167 | void sdw_debugfs_exit(void) |
168 | { |
169 | debugfs_remove_recursive(dentry: sdw_debugfs_root); |
170 | } |
171 | |