1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Debugfs support for hosts and cards
4 *
5 * Copyright (C) 2008 Atmel Corporation
6 */
7 #include <linux/moduleparam.h>
8 #include <linux/export.h>
9 #include <linux/debugfs.h>
10 #include <linux/fs.h>
11 #include <linux/seq_file.h>
12 #include <linux/slab.h>
13 #include <linux/stat.h>
14 #include <linux/fault-inject.h>
15
16 #include <linux/mmc/card.h>
17 #include <linux/mmc/host.h>
18
19 #include "core.h"
20 #include "card.h"
21 #include "host.h"
22 #include "mmc_ops.h"
23
24 #ifdef CONFIG_FAIL_MMC_REQUEST
25
26 static DECLARE_FAULT_ATTR(fail_default_attr);
27 static char *fail_request;
28 module_param(fail_request, charp, 0);
29
30 #endif /* CONFIG_FAIL_MMC_REQUEST */
31
32 /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
mmc_ios_show(struct seq_file * s,void * data)33 static int mmc_ios_show(struct seq_file *s, void *data)
34 {
35 static const char *vdd_str[] = {
36 [8] = "2.0",
37 [9] = "2.1",
38 [10] = "2.2",
39 [11] = "2.3",
40 [12] = "2.4",
41 [13] = "2.5",
42 [14] = "2.6",
43 [15] = "2.7",
44 [16] = "2.8",
45 [17] = "2.9",
46 [18] = "3.0",
47 [19] = "3.1",
48 [20] = "3.2",
49 [21] = "3.3",
50 [22] = "3.4",
51 [23] = "3.5",
52 [24] = "3.6",
53 };
54 struct mmc_host *host = s->private;
55 struct mmc_ios *ios = &host->ios;
56 const char *str;
57
58 seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
59 if (host->actual_clock)
60 seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock);
61 seq_printf(s, "vdd:\t\t%u ", ios->vdd);
62 if ((1 << ios->vdd) & MMC_VDD_165_195)
63 seq_printf(s, "(1.65 - 1.95 V)\n");
64 else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
65 && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
66 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
67 vdd_str[ios->vdd + 1]);
68 else
69 seq_printf(s, "(invalid)\n");
70
71 switch (ios->bus_mode) {
72 case MMC_BUSMODE_OPENDRAIN:
73 str = "open drain";
74 break;
75 case MMC_BUSMODE_PUSHPULL:
76 str = "push-pull";
77 break;
78 default:
79 str = "invalid";
80 break;
81 }
82 seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
83
84 switch (ios->chip_select) {
85 case MMC_CS_DONTCARE:
86 str = "don't care";
87 break;
88 case MMC_CS_HIGH:
89 str = "active high";
90 break;
91 case MMC_CS_LOW:
92 str = "active low";
93 break;
94 default:
95 str = "invalid";
96 break;
97 }
98 seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
99
100 switch (ios->power_mode) {
101 case MMC_POWER_OFF:
102 str = "off";
103 break;
104 case MMC_POWER_UP:
105 str = "up";
106 break;
107 case MMC_POWER_ON:
108 str = "on";
109 break;
110 default:
111 str = "invalid";
112 break;
113 }
114 seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
115 seq_printf(s, "bus width:\t%u (%u bits)\n",
116 ios->bus_width, 1 << ios->bus_width);
117
118 switch (ios->timing) {
119 case MMC_TIMING_LEGACY:
120 str = "legacy";
121 break;
122 case MMC_TIMING_MMC_HS:
123 str = "mmc high-speed";
124 break;
125 case MMC_TIMING_SD_HS:
126 str = "sd high-speed";
127 break;
128 case MMC_TIMING_UHS_SDR12:
129 str = "sd uhs SDR12";
130 break;
131 case MMC_TIMING_UHS_SDR25:
132 str = "sd uhs SDR25";
133 break;
134 case MMC_TIMING_UHS_SDR50:
135 str = "sd uhs SDR50";
136 break;
137 case MMC_TIMING_UHS_SDR104:
138 str = "sd uhs SDR104";
139 break;
140 case MMC_TIMING_UHS_DDR50:
141 str = "sd uhs DDR50";
142 break;
143 case MMC_TIMING_MMC_DDR52:
144 str = "mmc DDR52";
145 break;
146 case MMC_TIMING_MMC_HS200:
147 str = "mmc HS200";
148 break;
149 case MMC_TIMING_MMC_HS400:
150 str = mmc_card_hs400es(host->card) ?
151 "mmc HS400 enhanced strobe" : "mmc HS400";
152 break;
153 default:
154 str = "invalid";
155 break;
156 }
157 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
158
159 switch (ios->signal_voltage) {
160 case MMC_SIGNAL_VOLTAGE_330:
161 str = "3.30 V";
162 break;
163 case MMC_SIGNAL_VOLTAGE_180:
164 str = "1.80 V";
165 break;
166 case MMC_SIGNAL_VOLTAGE_120:
167 str = "1.20 V";
168 break;
169 default:
170 str = "invalid";
171 break;
172 }
173 seq_printf(s, "signal voltage:\t%u (%s)\n", ios->signal_voltage, str);
174
175 switch (ios->drv_type) {
176 case MMC_SET_DRIVER_TYPE_A:
177 str = "driver type A";
178 break;
179 case MMC_SET_DRIVER_TYPE_B:
180 str = "driver type B";
181 break;
182 case MMC_SET_DRIVER_TYPE_C:
183 str = "driver type C";
184 break;
185 case MMC_SET_DRIVER_TYPE_D:
186 str = "driver type D";
187 break;
188 default:
189 str = "invalid";
190 break;
191 }
192 seq_printf(s, "driver type:\t%u (%s)\n", ios->drv_type, str);
193
194 return 0;
195 }
196 DEFINE_SHOW_ATTRIBUTE(mmc_ios);
197
mmc_clock_opt_get(void * data,u64 * val)198 static int mmc_clock_opt_get(void *data, u64 *val)
199 {
200 struct mmc_host *host = data;
201
202 *val = host->ios.clock;
203
204 return 0;
205 }
206
mmc_clock_opt_set(void * data,u64 val)207 static int mmc_clock_opt_set(void *data, u64 val)
208 {
209 struct mmc_host *host = data;
210
211 /* We need this check due to input value is u64 */
212 if (val != 0 && (val > host->f_max || val < host->f_min))
213 return -EINVAL;
214
215 mmc_claim_host(host);
216 mmc_set_clock(host, (unsigned int) val);
217 mmc_release_host(host);
218
219 return 0;
220 }
221
222 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
223 "%llu\n");
224
mmc_add_host_debugfs(struct mmc_host * host)225 void mmc_add_host_debugfs(struct mmc_host *host)
226 {
227 struct dentry *root;
228
229 root = debugfs_create_dir(mmc_hostname(host), NULL);
230 host->debugfs_root = root;
231
232 debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops);
233 debugfs_create_x32("caps", S_IRUSR, root, &host->caps);
234 debugfs_create_x32("caps2", S_IRUSR, root, &host->caps2);
235 debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
236 &mmc_clock_fops);
237
238 #ifdef CONFIG_FAIL_MMC_REQUEST
239 if (fail_request)
240 setup_fault_attr(&fail_default_attr, fail_request);
241 host->fail_mmc_request = fail_default_attr;
242 fault_create_debugfs_attr("fail_mmc_request", root,
243 &host->fail_mmc_request);
244 #endif
245 }
246
mmc_remove_host_debugfs(struct mmc_host * host)247 void mmc_remove_host_debugfs(struct mmc_host *host)
248 {
249 debugfs_remove_recursive(host->debugfs_root);
250 }
251
mmc_add_card_debugfs(struct mmc_card * card)252 void mmc_add_card_debugfs(struct mmc_card *card)
253 {
254 struct mmc_host *host = card->host;
255 struct dentry *root;
256
257 if (!host->debugfs_root)
258 return;
259
260 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
261 card->debugfs_root = root;
262
263 debugfs_create_x32("state", S_IRUSR, root, &card->state);
264 }
265
mmc_remove_card_debugfs(struct mmc_card * card)266 void mmc_remove_card_debugfs(struct mmc_card *card)
267 {
268 debugfs_remove_recursive(card->debugfs_root);
269 card->debugfs_root = NULL;
270 }
271
