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57d92753 SG |
1 | /* |
2 | * Copyright (c) 2014 The Chromium OS Authors. | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0+ | |
5 | */ | |
6 | ||
7 | #include <common.h> | |
8 | #include <dm.h> | |
ad1b81c8 | 9 | #include <environment.h> |
57d92753 | 10 | #include <errno.h> |
57d92753 SG |
11 | #include <os.h> |
12 | #include <serial.h> | |
13 | #include <stdio_dev.h> | |
c487fd47 | 14 | #include <watchdog.h> |
57d92753 SG |
15 | #include <dm/lists.h> |
16 | #include <dm/device-internal.h> | |
f93472a0 | 17 | #include <dm/of_access.h> |
57d92753 SG |
18 | |
19 | DECLARE_GLOBAL_DATA_PTR; | |
20 | ||
ad1b81c8 SG |
21 | /* |
22 | * Table with supported baudrates (defined in config_xyz.h) | |
23 | */ | |
24 | static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE; | |
25 | ||
f1896c45 AY |
26 | #if !CONFIG_VAL(SYS_MALLOC_F_LEN) |
27 | #error "Serial is required before relocation - define CONFIG_$(SPL_)SYS_MALLOC_F_LEN to make this work" | |
57d92753 SG |
28 | #endif |
29 | ||
d0960853 SG |
30 | static int serial_check_stdout(const void *blob, struct udevice **devp) |
31 | { | |
32 | int node; | |
33 | ||
34 | /* Check for a chosen console */ | |
35 | node = fdtdec_get_chosen_node(blob, "stdout-path"); | |
36 | if (node < 0) { | |
37 | const char *str, *p, *name; | |
38 | ||
39 | /* | |
40 | * Deal with things like | |
41 | * stdout-path = "serial0:115200n8"; | |
42 | * | |
43 | * We need to look up the alias and then follow it to the | |
44 | * correct node. | |
45 | */ | |
46 | str = fdtdec_get_chosen_prop(blob, "stdout-path"); | |
47 | if (str) { | |
48 | p = strchr(str, ':'); | |
49 | name = fdt_get_alias_namelen(blob, str, | |
50 | p ? p - str : strlen(str)); | |
51 | if (name) | |
52 | node = fdt_path_offset(blob, name); | |
53 | } | |
54 | } | |
55 | if (node < 0) | |
56 | node = fdt_path_offset(blob, "console"); | |
57 | if (!uclass_get_device_by_of_offset(UCLASS_SERIAL, node, devp)) | |
58 | return 0; | |
59 | ||
60 | /* | |
61 | * If the console is not marked to be bound before relocation, bind it | |
62 | * anyway. | |
63 | */ | |
64 | if (node > 0 && !lists_bind_fdt(gd->dm_root, offset_to_ofnode(node), | |
65 | devp)) { | |
66 | if (!device_probe(*devp)) | |
67 | return 0; | |
68 | } | |
69 | ||
70 | return -ENODEV; | |
71 | } | |
72 | ||
57d92753 SG |
73 | static void serial_find_console_or_panic(void) |
74 | { | |
6bdc593e | 75 | const void *blob = gd->fdt_blob; |
469a579d | 76 | struct udevice *dev; |
57d92753 | 77 | |
b484b0da SG |
78 | if (CONFIG_IS_ENABLED(OF_PLATDATA)) { |
79 | uclass_first_device(UCLASS_SERIAL, &dev); | |
80 | if (dev) { | |
81 | gd->cur_serial_dev = dev; | |
82 | return; | |
83 | } | |
84 | } else if (CONFIG_IS_ENABLED(OF_CONTROL) && blob) { | |
f93472a0 SG |
85 | /* Live tree has support for stdout */ |
86 | if (of_live_active()) { | |
87 | struct device_node *np = of_get_stdout(); | |
88 | ||
89 | if (np && !uclass_get_device_by_ofnode(UCLASS_SERIAL, | |
90 | np_to_ofnode(np), &dev)) { | |
91 | gd->cur_serial_dev = dev; | |
92 | return; | |
93 | } | |
94 | } else { | |
95 | if (!serial_check_stdout(blob, &dev)) { | |
96 | gd->cur_serial_dev = dev; | |
97 | return; | |
98 | } | |
469a579d | 99 | } |
af282245 | 100 | } |
6bdc593e | 101 | if (!SPL_BUILD || !CONFIG_IS_ENABLED(OF_CONTROL) || !blob) { |
e9fc0583 | 102 | /* |
eb623b98 SR |
103 | * Try to use CONFIG_CONS_INDEX if available (it is numbered |
104 | * from 1!). | |
105 | * | |
106 | * Failing that, get the device with sequence number 0, or in | |
107 | * extremis just the first serial device we can find. But we | |
108 | * insist on having a console (even if it is silent). | |
109 | */ | |
91155c65 SG |
110 | #ifdef CONFIG_CONS_INDEX |
111 | #define INDEX (CONFIG_CONS_INDEX - 1) | |
112 | #else | |
113 | #define INDEX 0 | |
114 | #endif | |
e9fc0583 SG |
115 | if (!uclass_get_device_by_seq(UCLASS_SERIAL, INDEX, &dev) || |
116 | !uclass_get_device(UCLASS_SERIAL, INDEX, &dev) || | |
753812cb | 117 | (!uclass_first_device(UCLASS_SERIAL, &dev) && dev)) { |
e9fc0583 SG |
118 | gd->cur_serial_dev = dev; |
119 | return; | |
120 | } | |
91155c65 | 121 | #undef INDEX |
e9fc0583 SG |
122 | } |
123 | ||
8c458588 | 124 | #ifdef CONFIG_REQUIRE_SERIAL_CONSOLE |
e9fc0583 | 125 | panic_str("No serial driver found"); |
8c458588 | 126 | #endif |
57d92753 SG |
127 | } |
128 | ||
129 | /* Called prior to relocation */ | |
130 | int serial_init(void) | |
131 | { | |
132 | serial_find_console_or_panic(); | |
133 | gd->flags |= GD_FLG_SERIAL_READY; | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | /* Called after relocation */ | |
139 | void serial_initialize(void) | |
140 | { | |
e4d6ab0c | 141 | serial_init(); |
57d92753 SG |
142 | } |
143 | ||
eea5a4cc | 144 | static void _serial_putc(struct udevice *dev, char ch) |
57d92753 | 145 | { |
bac64467 | 146 | struct dm_serial_ops *ops = serial_get_ops(dev); |
57d92753 SG |
147 | int err; |
148 | ||
c5917b4b AW |
149 | if (ch == '\n') |
150 | _serial_putc(dev, '\r'); | |
151 | ||
57d92753 | 152 | do { |
bac64467 | 153 | err = ops->putc(dev, ch); |
57d92753 | 154 | } while (err == -EAGAIN); |
57d92753 SG |
155 | } |
156 | ||
eea5a4cc | 157 | static void _serial_puts(struct udevice *dev, const char *str) |
b8893327 | 158 | { |
eea5a4cc MY |
159 | while (*str) |
160 | _serial_putc(dev, *str++); | |
b8893327 SG |
161 | } |
162 | ||
eea5a4cc | 163 | static int _serial_getc(struct udevice *dev) |
57d92753 | 164 | { |
eea5a4cc MY |
165 | struct dm_serial_ops *ops = serial_get_ops(dev); |
166 | int err; | |
57d92753 | 167 | |
eea5a4cc MY |
168 | do { |
169 | err = ops->getc(dev); | |
170 | if (err == -EAGAIN) | |
171 | WATCHDOG_RESET(); | |
172 | } while (err == -EAGAIN); | |
57d92753 | 173 | |
eea5a4cc | 174 | return err >= 0 ? err : 0; |
57d92753 SG |
175 | } |
176 | ||
eea5a4cc | 177 | static int _serial_tstc(struct udevice *dev) |
57d92753 | 178 | { |
eea5a4cc | 179 | struct dm_serial_ops *ops = serial_get_ops(dev); |
57d92753 SG |
180 | |
181 | if (ops->pending) | |
eea5a4cc | 182 | return ops->pending(dev, true); |
57d92753 SG |
183 | |
184 | return 1; | |
185 | } | |
186 | ||
eea5a4cc | 187 | void serial_putc(char ch) |
57d92753 | 188 | { |
8c458588 HG |
189 | if (gd->cur_serial_dev) |
190 | _serial_putc(gd->cur_serial_dev, ch); | |
eea5a4cc | 191 | } |
57d92753 | 192 | |
eea5a4cc MY |
193 | void serial_puts(const char *str) |
194 | { | |
8c458588 HG |
195 | if (gd->cur_serial_dev) |
196 | _serial_puts(gd->cur_serial_dev, str); | |
57d92753 SG |
197 | } |
198 | ||
b8893327 SG |
199 | int serial_getc(void) |
200 | { | |
8c458588 HG |
201 | if (!gd->cur_serial_dev) |
202 | return 0; | |
203 | ||
469a579d | 204 | return _serial_getc(gd->cur_serial_dev); |
eea5a4cc MY |
205 | } |
206 | ||
207 | int serial_tstc(void) | |
208 | { | |
8c458588 HG |
209 | if (!gd->cur_serial_dev) |
210 | return 0; | |
211 | ||
469a579d | 212 | return _serial_tstc(gd->cur_serial_dev); |
eea5a4cc MY |
213 | } |
214 | ||
215 | void serial_setbrg(void) | |
216 | { | |
8c458588 HG |
217 | struct dm_serial_ops *ops; |
218 | ||
219 | if (!gd->cur_serial_dev) | |
220 | return; | |
eea5a4cc | 221 | |
8c458588 | 222 | ops = serial_get_ops(gd->cur_serial_dev); |
eea5a4cc | 223 | if (ops->setbrg) |
469a579d | 224 | ops->setbrg(gd->cur_serial_dev, gd->baudrate); |
b8893327 SG |
225 | } |
226 | ||
57d92753 SG |
227 | void serial_stdio_init(void) |
228 | { | |
229 | } | |
230 | ||
49ddcf3e MY |
231 | #if defined(CONFIG_DM_STDIO) |
232 | ||
233 | #if CONFIG_IS_ENABLED(SERIAL_PRESENT) | |
b8893327 | 234 | static void serial_stub_putc(struct stdio_dev *sdev, const char ch) |
57d92753 | 235 | { |
eea5a4cc | 236 | _serial_putc(sdev->priv, ch); |
57d92753 | 237 | } |
236f2bd3 | 238 | #endif |
57d92753 | 239 | |
49ddcf3e | 240 | static void serial_stub_puts(struct stdio_dev *sdev, const char *str) |
57d92753 | 241 | { |
eea5a4cc | 242 | _serial_puts(sdev->priv, str); |
57d92753 SG |
243 | } |
244 | ||
49ddcf3e | 245 | static int serial_stub_getc(struct stdio_dev *sdev) |
57d92753 | 246 | { |
eea5a4cc | 247 | return _serial_getc(sdev->priv); |
57d92753 SG |
248 | } |
249 | ||
49ddcf3e | 250 | static int serial_stub_tstc(struct stdio_dev *sdev) |
57d92753 | 251 | { |
eea5a4cc | 252 | return _serial_tstc(sdev->priv); |
57d92753 | 253 | } |
49ddcf3e | 254 | #endif |
57d92753 | 255 | |
ad1b81c8 SG |
256 | /** |
257 | * on_baudrate() - Update the actual baudrate when the env var changes | |
258 | * | |
259 | * This will check for a valid baudrate and only apply it if valid. | |
260 | */ | |
261 | static int on_baudrate(const char *name, const char *value, enum env_op op, | |
262 | int flags) | |
263 | { | |
264 | int i; | |
265 | int baudrate; | |
266 | ||
267 | switch (op) { | |
268 | case env_op_create: | |
269 | case env_op_overwrite: | |
270 | /* | |
271 | * Switch to new baudrate if new baudrate is supported | |
272 | */ | |
273 | baudrate = simple_strtoul(value, NULL, 10); | |
274 | ||
275 | /* Not actually changing */ | |
276 | if (gd->baudrate == baudrate) | |
277 | return 0; | |
278 | ||
279 | for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) { | |
280 | if (baudrate == baudrate_table[i]) | |
281 | break; | |
282 | } | |
283 | if (i == ARRAY_SIZE(baudrate_table)) { | |
284 | if ((flags & H_FORCE) == 0) | |
285 | printf("## Baudrate %d bps not supported\n", | |
286 | baudrate); | |
287 | return 1; | |
288 | } | |
289 | if ((flags & H_INTERACTIVE) != 0) { | |
290 | printf("## Switch baudrate to %d bps and press ENTER ...\n", | |
291 | baudrate); | |
292 | udelay(50000); | |
293 | } | |
294 | ||
295 | gd->baudrate = baudrate; | |
296 | ||
297 | serial_setbrg(); | |
298 | ||
299 | udelay(50000); | |
300 | ||
301 | if ((flags & H_INTERACTIVE) != 0) | |
302 | while (1) { | |
303 | if (getc() == '\r') | |
304 | break; | |
305 | } | |
306 | ||
307 | return 0; | |
308 | case env_op_delete: | |
309 | printf("## Baudrate may not be deleted\n"); | |
310 | return 1; | |
311 | default: | |
312 | return 0; | |
313 | } | |
314 | } | |
315 | U_BOOT_ENV_CALLBACK(baudrate, on_baudrate); | |
316 | ||
92c55b68 | 317 | #if CONFIG_IS_ENABLED(SERIAL_PRESENT) |
57d92753 SG |
318 | static int serial_post_probe(struct udevice *dev) |
319 | { | |
57d92753 | 320 | struct dm_serial_ops *ops = serial_get_ops(dev); |
236f2bd3 | 321 | #ifdef CONFIG_DM_STDIO |
e564f054 | 322 | struct serial_dev_priv *upriv = dev_get_uclass_priv(dev); |
236f2bd3 SG |
323 | struct stdio_dev sdev; |
324 | #endif | |
57d92753 SG |
325 | int ret; |
326 | ||
484fdf5b MS |
327 | #if defined(CONFIG_NEEDS_MANUAL_RELOC) |
328 | if (ops->setbrg) | |
329 | ops->setbrg += gd->reloc_off; | |
330 | if (ops->getc) | |
331 | ops->getc += gd->reloc_off; | |
332 | if (ops->putc) | |
333 | ops->putc += gd->reloc_off; | |
334 | if (ops->pending) | |
335 | ops->pending += gd->reloc_off; | |
336 | if (ops->clear) | |
337 | ops->clear += gd->reloc_off; | |
338 | #if CONFIG_POST & CONFIG_SYS_POST_UART | |
339 | if (ops->loop) | |
340 | ops->loop += gd->reloc_off | |
341 | #endif | |
342 | #endif | |
57d92753 SG |
343 | /* Set the baud rate */ |
344 | if (ops->setbrg) { | |
345 | ret = ops->setbrg(dev, gd->baudrate); | |
346 | if (ret) | |
347 | return ret; | |
348 | } | |
349 | ||
236f2bd3 | 350 | #ifdef CONFIG_DM_STDIO |
57d92753 SG |
351 | if (!(gd->flags & GD_FLG_RELOC)) |
352 | return 0; | |
57d92753 SG |
353 | memset(&sdev, '\0', sizeof(sdev)); |
354 | ||
355 | strncpy(sdev.name, dev->name, sizeof(sdev.name)); | |
7b3c4c3a | 356 | sdev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_DM; |
57d92753 SG |
357 | sdev.priv = dev; |
358 | sdev.putc = serial_stub_putc; | |
359 | sdev.puts = serial_stub_puts; | |
360 | sdev.getc = serial_stub_getc; | |
361 | sdev.tstc = serial_stub_tstc; | |
362 | stdio_register_dev(&sdev, &upriv->sdev); | |
236f2bd3 | 363 | #endif |
57d92753 SG |
364 | return 0; |
365 | } | |
366 | ||
367 | static int serial_pre_remove(struct udevice *dev) | |
368 | { | |
869588de | 369 | #if CONFIG_IS_ENABLED(SYS_STDIO_DEREGISTER) |
e564f054 | 370 | struct serial_dev_priv *upriv = dev_get_uclass_priv(dev); |
57d92753 | 371 | |
e98856fc | 372 | if (stdio_deregister_dev(upriv->sdev, true)) |
57d92753 SG |
373 | return -EPERM; |
374 | #endif | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
379 | UCLASS_DRIVER(serial) = { | |
380 | .id = UCLASS_SERIAL, | |
381 | .name = "serial", | |
9cc36a2b | 382 | .flags = DM_UC_FLAG_SEQ_ALIAS, |
57d92753 SG |
383 | .post_probe = serial_post_probe, |
384 | .pre_remove = serial_pre_remove, | |
385 | .per_device_auto_alloc_size = sizeof(struct serial_dev_priv), | |
386 | }; | |
92c55b68 | 387 | #endif |