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
13static struct dentry *sdw_debugfs_root;
14
15void 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
27void 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
34static 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
48static 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}
138DEFINE_SHOW_ATTRIBUTE(sdw_slave_reg);
139
140void 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
157void sdw_slave_debugfs_exit(struct sdw_slave *slave)
158{
159 debugfs_remove_recursive(dentry: slave->debugfs);
160}
161
162void sdw_debugfs_init(void)
163{
164 sdw_debugfs_root = debugfs_create_dir(name: "soundwire", NULL);
165}
166
167void sdw_debugfs_exit(void)
168{
169 debugfs_remove_recursive(dentry: sdw_debugfs_root);
170}
171

source code of linux/drivers/soundwire/debugfs.c