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(name, sizeof(name), "master-%d-%d", bus->controller_id, bus->link_id);
24	bus->debugfs = debugfs_create_dir(name, sdw_debugfs_root);
25}
26
27void 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
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, 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
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(&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}
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(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
157void sdw_slave_debugfs_exit(struct sdw_slave *slave)
158{
159	debugfs_remove_recursive(slave->debugfs);
160}
161
162void sdw_debugfs_init(void)
163{
164	sdw_debugfs_root = debugfs_create_dir("soundwire", NULL);
165}
166
167void sdw_debugfs_exit(void)
168{
169	debugfs_remove_recursive(sdw_debugfs_root);
170}
171