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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 SG |
10 | #include <errno.h> |
11 | #include <fdtdec.h> | |
12 | #include <os.h> | |
13 | #include <serial.h> | |
14 | #include <stdio_dev.h> | |
c487fd47 | 15 | #include <watchdog.h> |
57d92753 SG |
16 | #include <dm/lists.h> |
17 | #include <dm/device-internal.h> | |
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 | ||
57d92753 SG |
26 | #ifndef CONFIG_SYS_MALLOC_F_LEN |
27 | #error "Serial is required before relocation - define CONFIG_SYS_MALLOC_F_LEN to make this work" | |
28 | #endif | |
29 | ||
30 | static void serial_find_console_or_panic(void) | |
31 | { | |
6bdc593e | 32 | const void *blob = gd->fdt_blob; |
469a579d | 33 | struct udevice *dev; |
57d92753 SG |
34 | int node; |
35 | ||
6bdc593e | 36 | if (CONFIG_IS_ENABLED(OF_CONTROL) && blob) { |
e9fc0583 | 37 | /* Check for a chosen console */ |
6bdc593e SG |
38 | node = fdtdec_get_chosen_node(blob, "stdout-path"); |
39 | if (node < 0) { | |
40 | const char *str, *p, *name; | |
41 | ||
42 | /* | |
43 | * Deal with things like | |
44 | * stdout-path = "serial0:115200n8"; | |
45 | * | |
46 | * We need to look up the alias and then follow it to | |
47 | * the correct node. | |
48 | */ | |
49 | str = fdtdec_get_chosen_prop(blob, "stdout-path"); | |
50 | if (str) { | |
51 | p = strchr(str, ':'); | |
52 | name = fdt_get_alias_namelen(blob, str, | |
53 | p ? p - str : strlen(str)); | |
54 | if (name) | |
55 | node = fdt_path_offset(blob, name); | |
56 | } | |
57 | } | |
e9fc0583 | 58 | if (node < 0) |
6bdc593e | 59 | node = fdt_path_offset(blob, "console"); |
e9fc0583 SG |
60 | if (!uclass_get_device_by_of_offset(UCLASS_SERIAL, node, |
61 | &dev)) { | |
469a579d | 62 | gd->cur_serial_dev = dev; |
57d92753 | 63 | return; |
469a579d | 64 | } |
e9fc0583 SG |
65 | |
66 | /* | |
67 | * If the console is not marked to be bound before relocation, | |
68 | * bind it anyway. | |
69 | */ | |
70 | if (node > 0 && | |
6bdc593e | 71 | !lists_bind_fdt(gd->dm_root, blob, node, &dev)) { |
e9fc0583 SG |
72 | if (!device_probe(dev)) { |
73 | gd->cur_serial_dev = dev; | |
74 | return; | |
75 | } | |
76 | } | |
af282245 | 77 | } |
6bdc593e | 78 | if (!SPL_BUILD || !CONFIG_IS_ENABLED(OF_CONTROL) || !blob) { |
e9fc0583 SG |
79 | /* |
80 | * Try to use CONFIG_CONS_INDEX if available (it is numbered | |
81 | * from 1!). | |
82 | * | |
83 | * Failing that, get the device with sequence number 0, or in | |
84 | * extremis just the first serial device we can find. But we | |
85 | * insist on having a console (even if it is silent). | |
86 | */ | |
91155c65 SG |
87 | #ifdef CONFIG_CONS_INDEX |
88 | #define INDEX (CONFIG_CONS_INDEX - 1) | |
89 | #else | |
90 | #define INDEX 0 | |
91 | #endif | |
e9fc0583 SG |
92 | if (!uclass_get_device_by_seq(UCLASS_SERIAL, INDEX, &dev) || |
93 | !uclass_get_device(UCLASS_SERIAL, INDEX, &dev) || | |
753812cb | 94 | (!uclass_first_device(UCLASS_SERIAL, &dev) && dev)) { |
e9fc0583 SG |
95 | gd->cur_serial_dev = dev; |
96 | return; | |
97 | } | |
91155c65 | 98 | #undef INDEX |
e9fc0583 SG |
99 | } |
100 | ||
8c458588 | 101 | #ifdef CONFIG_REQUIRE_SERIAL_CONSOLE |
e9fc0583 | 102 | panic_str("No serial driver found"); |
8c458588 | 103 | #endif |
57d92753 SG |
104 | } |
105 | ||
106 | /* Called prior to relocation */ | |
107 | int serial_init(void) | |
108 | { | |
109 | serial_find_console_or_panic(); | |
110 | gd->flags |= GD_FLG_SERIAL_READY; | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | /* Called after relocation */ | |
116 | void serial_initialize(void) | |
117 | { | |
118 | serial_find_console_or_panic(); | |
119 | } | |
120 | ||
eea5a4cc | 121 | static void _serial_putc(struct udevice *dev, char ch) |
57d92753 | 122 | { |
bac64467 | 123 | struct dm_serial_ops *ops = serial_get_ops(dev); |
57d92753 SG |
124 | int err; |
125 | ||
126 | do { | |
bac64467 | 127 | err = ops->putc(dev, ch); |
57d92753 SG |
128 | } while (err == -EAGAIN); |
129 | if (ch == '\n') | |
eea5a4cc | 130 | _serial_putc(dev, '\r'); |
57d92753 SG |
131 | } |
132 | ||
eea5a4cc | 133 | static void _serial_puts(struct udevice *dev, const char *str) |
b8893327 | 134 | { |
eea5a4cc MY |
135 | while (*str) |
136 | _serial_putc(dev, *str++); | |
b8893327 SG |
137 | } |
138 | ||
eea5a4cc | 139 | static int _serial_getc(struct udevice *dev) |
57d92753 | 140 | { |
eea5a4cc MY |
141 | struct dm_serial_ops *ops = serial_get_ops(dev); |
142 | int err; | |
57d92753 | 143 | |
eea5a4cc MY |
144 | do { |
145 | err = ops->getc(dev); | |
146 | if (err == -EAGAIN) | |
147 | WATCHDOG_RESET(); | |
148 | } while (err == -EAGAIN); | |
57d92753 | 149 | |
eea5a4cc | 150 | return err >= 0 ? err : 0; |
57d92753 SG |
151 | } |
152 | ||
eea5a4cc | 153 | static int _serial_tstc(struct udevice *dev) |
57d92753 | 154 | { |
eea5a4cc | 155 | struct dm_serial_ops *ops = serial_get_ops(dev); |
57d92753 SG |
156 | |
157 | if (ops->pending) | |
eea5a4cc | 158 | return ops->pending(dev, true); |
57d92753 SG |
159 | |
160 | return 1; | |
161 | } | |
162 | ||
eea5a4cc | 163 | void serial_putc(char ch) |
57d92753 | 164 | { |
8c458588 HG |
165 | if (gd->cur_serial_dev) |
166 | _serial_putc(gd->cur_serial_dev, ch); | |
eea5a4cc | 167 | } |
57d92753 | 168 | |
eea5a4cc MY |
169 | void serial_puts(const char *str) |
170 | { | |
8c458588 HG |
171 | if (gd->cur_serial_dev) |
172 | _serial_puts(gd->cur_serial_dev, str); | |
57d92753 SG |
173 | } |
174 | ||
b8893327 SG |
175 | int serial_getc(void) |
176 | { | |
8c458588 HG |
177 | if (!gd->cur_serial_dev) |
178 | return 0; | |
179 | ||
469a579d | 180 | return _serial_getc(gd->cur_serial_dev); |
eea5a4cc MY |
181 | } |
182 | ||
183 | int serial_tstc(void) | |
184 | { | |
8c458588 HG |
185 | if (!gd->cur_serial_dev) |
186 | return 0; | |
187 | ||
469a579d | 188 | return _serial_tstc(gd->cur_serial_dev); |
eea5a4cc MY |
189 | } |
190 | ||
191 | void serial_setbrg(void) | |
192 | { | |
8c458588 HG |
193 | struct dm_serial_ops *ops; |
194 | ||
195 | if (!gd->cur_serial_dev) | |
196 | return; | |
eea5a4cc | 197 | |
8c458588 | 198 | ops = serial_get_ops(gd->cur_serial_dev); |
eea5a4cc | 199 | if (ops->setbrg) |
469a579d | 200 | ops->setbrg(gd->cur_serial_dev, gd->baudrate); |
b8893327 SG |
201 | } |
202 | ||
57d92753 SG |
203 | void serial_stdio_init(void) |
204 | { | |
205 | } | |
206 | ||
236f2bd3 | 207 | #ifdef CONFIG_DM_STDIO |
b8893327 | 208 | static void serial_stub_putc(struct stdio_dev *sdev, const char ch) |
57d92753 | 209 | { |
eea5a4cc | 210 | _serial_putc(sdev->priv, ch); |
57d92753 | 211 | } |
236f2bd3 | 212 | #endif |
57d92753 SG |
213 | |
214 | void serial_stub_puts(struct stdio_dev *sdev, const char *str) | |
215 | { | |
eea5a4cc | 216 | _serial_puts(sdev->priv, str); |
57d92753 SG |
217 | } |
218 | ||
219 | int serial_stub_getc(struct stdio_dev *sdev) | |
220 | { | |
eea5a4cc | 221 | return _serial_getc(sdev->priv); |
57d92753 SG |
222 | } |
223 | ||
224 | int serial_stub_tstc(struct stdio_dev *sdev) | |
225 | { | |
eea5a4cc | 226 | return _serial_tstc(sdev->priv); |
57d92753 SG |
227 | } |
228 | ||
ad1b81c8 SG |
229 | /** |
230 | * on_baudrate() - Update the actual baudrate when the env var changes | |
231 | * | |
232 | * This will check for a valid baudrate and only apply it if valid. | |
233 | */ | |
234 | static int on_baudrate(const char *name, const char *value, enum env_op op, | |
235 | int flags) | |
236 | { | |
237 | int i; | |
238 | int baudrate; | |
239 | ||
240 | switch (op) { | |
241 | case env_op_create: | |
242 | case env_op_overwrite: | |
243 | /* | |
244 | * Switch to new baudrate if new baudrate is supported | |
245 | */ | |
246 | baudrate = simple_strtoul(value, NULL, 10); | |
247 | ||
248 | /* Not actually changing */ | |
249 | if (gd->baudrate == baudrate) | |
250 | return 0; | |
251 | ||
252 | for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) { | |
253 | if (baudrate == baudrate_table[i]) | |
254 | break; | |
255 | } | |
256 | if (i == ARRAY_SIZE(baudrate_table)) { | |
257 | if ((flags & H_FORCE) == 0) | |
258 | printf("## Baudrate %d bps not supported\n", | |
259 | baudrate); | |
260 | return 1; | |
261 | } | |
262 | if ((flags & H_INTERACTIVE) != 0) { | |
263 | printf("## Switch baudrate to %d bps and press ENTER ...\n", | |
264 | baudrate); | |
265 | udelay(50000); | |
266 | } | |
267 | ||
268 | gd->baudrate = baudrate; | |
269 | ||
270 | serial_setbrg(); | |
271 | ||
272 | udelay(50000); | |
273 | ||
274 | if ((flags & H_INTERACTIVE) != 0) | |
275 | while (1) { | |
276 | if (getc() == '\r') | |
277 | break; | |
278 | } | |
279 | ||
280 | return 0; | |
281 | case env_op_delete: | |
282 | printf("## Baudrate may not be deleted\n"); | |
283 | return 1; | |
284 | default: | |
285 | return 0; | |
286 | } | |
287 | } | |
288 | U_BOOT_ENV_CALLBACK(baudrate, on_baudrate); | |
289 | ||
57d92753 SG |
290 | static int serial_post_probe(struct udevice *dev) |
291 | { | |
57d92753 | 292 | struct dm_serial_ops *ops = serial_get_ops(dev); |
236f2bd3 | 293 | #ifdef CONFIG_DM_STDIO |
e564f054 | 294 | struct serial_dev_priv *upriv = dev_get_uclass_priv(dev); |
236f2bd3 SG |
295 | struct stdio_dev sdev; |
296 | #endif | |
57d92753 SG |
297 | int ret; |
298 | ||
484fdf5b MS |
299 | #if defined(CONFIG_NEEDS_MANUAL_RELOC) |
300 | if (ops->setbrg) | |
301 | ops->setbrg += gd->reloc_off; | |
302 | if (ops->getc) | |
303 | ops->getc += gd->reloc_off; | |
304 | if (ops->putc) | |
305 | ops->putc += gd->reloc_off; | |
306 | if (ops->pending) | |
307 | ops->pending += gd->reloc_off; | |
308 | if (ops->clear) | |
309 | ops->clear += gd->reloc_off; | |
310 | #if CONFIG_POST & CONFIG_SYS_POST_UART | |
311 | if (ops->loop) | |
312 | ops->loop += gd->reloc_off | |
313 | #endif | |
314 | #endif | |
57d92753 SG |
315 | /* Set the baud rate */ |
316 | if (ops->setbrg) { | |
317 | ret = ops->setbrg(dev, gd->baudrate); | |
318 | if (ret) | |
319 | return ret; | |
320 | } | |
321 | ||
236f2bd3 | 322 | #ifdef CONFIG_DM_STDIO |
57d92753 SG |
323 | if (!(gd->flags & GD_FLG_RELOC)) |
324 | return 0; | |
57d92753 SG |
325 | memset(&sdev, '\0', sizeof(sdev)); |
326 | ||
327 | strncpy(sdev.name, dev->name, sizeof(sdev.name)); | |
328 | sdev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT; | |
329 | sdev.priv = dev; | |
330 | sdev.putc = serial_stub_putc; | |
331 | sdev.puts = serial_stub_puts; | |
332 | sdev.getc = serial_stub_getc; | |
333 | sdev.tstc = serial_stub_tstc; | |
334 | stdio_register_dev(&sdev, &upriv->sdev); | |
236f2bd3 | 335 | #endif |
57d92753 SG |
336 | return 0; |
337 | } | |
338 | ||
339 | static int serial_pre_remove(struct udevice *dev) | |
340 | { | |
341 | #ifdef CONFIG_SYS_STDIO_DEREGISTER | |
e564f054 | 342 | struct serial_dev_priv *upriv = dev_get_uclass_priv(dev); |
57d92753 | 343 | |
4a74298c | 344 | if (stdio_deregister_dev(upriv->sdev, 0)) |
57d92753 SG |
345 | return -EPERM; |
346 | #endif | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
351 | UCLASS_DRIVER(serial) = { | |
352 | .id = UCLASS_SERIAL, | |
353 | .name = "serial", | |
9cc36a2b | 354 | .flags = DM_UC_FLAG_SEQ_ALIAS, |
57d92753 SG |
355 | .post_probe = serial_post_probe, |
356 | .pre_remove = serial_pre_remove, | |
357 | .per_device_auto_alloc_size = sizeof(struct serial_dev_priv), | |
358 | }; |