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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}
1// SPDX-License-Identifier: GPL-2.0-only
2// Copyright(c) 2017-2019 Intel Corporation.
3
4#include <linux/cleanup.h>
5#include <linux/device.h>
6#include <linux/debugfs.h>
7#include <linux/firmware.h>
8#include <linux/mod_devicetable.h>
9#include <linux/pm_runtime.h>
10#include <linux/slab.h>
11#include <linux/soundwire/sdw.h>
12#include <linux/soundwire/sdw_registers.h>
13#include "bus.h"
14
15static struct dentry *sdw_debugfs_root;
16
17void sdw_bus_debugfs_init(struct sdw_bus *bus)
18{
19 char name[16];
20
21 if (!sdw_debugfs_root)
22 return;
23
24 /* create the debugfs master-N */
25 snprintf(name, sizeof(name), "master-%d-%d", bus->controller_id, bus->link_id);
26 bus->debugfs = debugfs_create_dir(name, sdw_debugfs_root);
27}
28
29void sdw_bus_debugfs_exit(struct sdw_bus *bus)
30{
31 debugfs_remove_recursive(bus->debugfs);
32}
33
34#define RD_BUF (3 * PAGE_SIZE)
35
36static ssize_t sdw_sprintf(struct sdw_slave *slave,
37 char *buf, size_t pos, unsigned int reg)
38{
39 int value;
40
41 value = sdw_read_no_pm(slave, reg);
42
43 if (value < 0)
44 return scnprintf(buf + pos, RD_BUF - pos, "%3x\tXX\n", reg);
45 else
46 return scnprintf(buf + pos, RD_BUF - pos,
47 "%3x\t%2x\n", reg, value);
48}
49
50static int sdw_slave_reg_show(struct seq_file *s_file, void *data)
51{
52 struct sdw_slave *slave = s_file->private;
53 ssize_t ret;
54 int i, j;
55
56 char *buf __free(kfree) = kzalloc(RD_BUF, GFP_KERNEL);
57 if (!buf)
58 return -ENOMEM;
59
60 ret = pm_runtime_get_sync(&slave->dev);
61 if (ret < 0 && ret != -EACCES) {
62 pm_runtime_put_noidle(&slave->dev);
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 return 0;
135}
136DEFINE_SHOW_ATTRIBUTE(sdw_slave_reg);
137
138#define MAX_CMD_BYTES 256
139
140static int cmd;
141static u32 start_addr;
142static size_t num_bytes;
143static u8 read_buffer[MAX_CMD_BYTES];
144static char *firmware_file;
145
146static int set_command(void *data, u64 value)
147{
148 struct sdw_slave *slave = data;
149
150 if (value > 1)
151 return -EINVAL;
152
153 /* Userspace changed the hardware state behind the kernel's back */
154 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
155
156 dev_dbg(&slave->dev, "command: %s\n", value ? "read" : "write");
157 cmd = value;
158
159 return 0;
160}
161DEFINE_DEBUGFS_ATTRIBUTE(set_command_fops, NULL,
162 set_command, "%llu\n");
163
164static int set_start_address(void *data, u64 value)
165{
166 struct sdw_slave *slave = data;
167
168 /* Userspace changed the hardware state behind the kernel's back */
169 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
170
171 dev_dbg(&slave->dev, "start address %#llx\n", value);
172
173 start_addr = value;
174
175 return 0;
176}
177DEFINE_DEBUGFS_ATTRIBUTE(set_start_address_fops, NULL,
178 set_start_address, "%llu\n");
179
180static int set_num_bytes(void *data, u64 value)
181{
182 struct sdw_slave *slave = data;
183
184 if (value == 0 || value > MAX_CMD_BYTES)
185 return -EINVAL;
186
187 /* Userspace changed the hardware state behind the kernel's back */
188 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
189
190 dev_dbg(&slave->dev, "number of bytes %lld\n", value);
191
192 num_bytes = value;
193
194 return 0;
195}
196DEFINE_DEBUGFS_ATTRIBUTE(set_num_bytes_fops, NULL,
197 set_num_bytes, "%llu\n");
198
199static int cmd_go(void *data, u64 value)
200{
201 struct sdw_slave *slave = data;
202 int ret;
203
204 if (value != 1)
205 return -EINVAL;
206
207 /* one last check */
208 if (start_addr > SDW_REG_MAX ||
209 num_bytes == 0 || num_bytes > MAX_CMD_BYTES)
210 return -EINVAL;
211
212 ret = pm_runtime_get_sync(&slave->dev);
213 if (ret < 0 && ret != -EACCES) {
214 pm_runtime_put_noidle(&slave->dev);
215 return ret;
216 }
217
218 /* Userspace changed the hardware state behind the kernel's back */
219 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
220
221 dev_dbg(&slave->dev, "starting command\n");
222
223 if (cmd == 0) {
224 const struct firmware *fw;
225
226 ret = request_firmware(&fw, firmware_file, &slave->dev);
227 if (ret < 0) {
228 dev_err(&slave->dev, "firmware %s not found\n", firmware_file);
229 goto out;
230 }
231
232 if (fw->size != num_bytes) {
233 dev_err(&slave->dev,
234 "firmware %s: unexpected size %zd, desired %zd\n",
235 firmware_file, fw->size, num_bytes);
236 release_firmware(fw);
237 goto out;
238 }
239
240 ret = sdw_nwrite_no_pm(slave, start_addr, num_bytes, fw->data);
241 release_firmware(fw);
242 } else {
243 ret = sdw_nread_no_pm(slave, start_addr, num_bytes, read_buffer);
244 }
245
246 dev_dbg(&slave->dev, "command completed %d\n", ret);
247
248out:
249 pm_runtime_mark_last_busy(&slave->dev);
250 pm_runtime_put(&slave->dev);
251
252 return ret;
253}
254DEFINE_DEBUGFS_ATTRIBUTE(cmd_go_fops, NULL,
255 cmd_go, "%llu\n");
256
257#define MAX_LINE_LEN 128
258
259static int read_buffer_show(struct seq_file *s_file, void *data)
260{
261 char buf[MAX_LINE_LEN];
262 int i;
263
264 if (num_bytes == 0 || num_bytes > MAX_CMD_BYTES)
265 return -EINVAL;
266
267 for (i = 0; i < num_bytes; i++) {
268 scnprintf(buf, MAX_LINE_LEN, "address %#x val 0x%02x\n",
269 start_addr + i, read_buffer[i]);
270 seq_printf(s_file, "%s", buf);
271 }
272
273 return 0;
274}
275DEFINE_SHOW_ATTRIBUTE(read_buffer);
276
277void sdw_slave_debugfs_init(struct sdw_slave *slave)
278{
279 struct dentry *master;
280 struct dentry *d;
281 char name[32];
282
283 master = slave->bus->debugfs;
284
285 /* create the debugfs slave-name */
286 snprintf(name, sizeof(name), "%s", dev_name(&slave->dev));
287 d = debugfs_create_dir(name, master);
288
289 debugfs_create_file("registers", 0400, d, slave, &sdw_slave_reg_fops);
290
291 /* interface to send arbitrary commands */
292 debugfs_create_file("command", 0200, d, slave, &set_command_fops);
293 debugfs_create_file("start_address", 0200, d, slave, &set_start_address_fops);
294 debugfs_create_file("num_bytes", 0200, d, slave, &set_num_bytes_fops);
295 debugfs_create_file("go", 0200, d, slave, &cmd_go_fops);
296
297 debugfs_create_file("read_buffer", 0400, d, slave, &read_buffer_fops);
298 firmware_file = NULL;
299 debugfs_create_str("firmware_file", 0200, d, &firmware_file);
300
301 slave->debugfs = d;
302}
303
304void sdw_slave_debugfs_exit(struct sdw_slave *slave)
305{
306 debugfs_remove_recursive(slave->debugfs);
307}
308
309void sdw_debugfs_init(void)
310{
311 sdw_debugfs_root = debugfs_create_dir("soundwire", NULL);
312}
313
314void sdw_debugfs_exit(void)
315{
316 debugfs_remove_recursive(sdw_debugfs_root);
317}