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Commit | Line | Data |
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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 | { | |
469a579d | 32 | struct udevice *dev; |
57d92753 SG |
33 | int node; |
34 | ||
0f925822 | 35 | if (CONFIG_IS_ENABLED(OF_CONTROL) && gd->fdt_blob) { |
e9fc0583 SG |
36 | /* Check for a chosen console */ |
37 | node = fdtdec_get_chosen_node(gd->fdt_blob, "stdout-path"); | |
38 | if (node < 0) | |
39 | node = fdt_path_offset(gd->fdt_blob, "console"); | |
40 | if (!uclass_get_device_by_of_offset(UCLASS_SERIAL, node, | |
41 | &dev)) { | |
469a579d | 42 | gd->cur_serial_dev = dev; |
57d92753 | 43 | return; |
469a579d | 44 | } |
e9fc0583 SG |
45 | |
46 | /* | |
47 | * If the console is not marked to be bound before relocation, | |
48 | * bind it anyway. | |
49 | */ | |
50 | if (node > 0 && | |
51 | !lists_bind_fdt(gd->dm_root, gd->fdt_blob, node, &dev)) { | |
52 | if (!device_probe(dev)) { | |
53 | gd->cur_serial_dev = dev; | |
54 | return; | |
55 | } | |
56 | } | |
af282245 | 57 | } |
0f925822 | 58 | if (!SPL_BUILD || !CONFIG_IS_ENABLED(OF_CONTROL) || !gd->fdt_blob) { |
e9fc0583 SG |
59 | /* |
60 | * Try to use CONFIG_CONS_INDEX if available (it is numbered | |
61 | * from 1!). | |
62 | * | |
63 | * Failing that, get the device with sequence number 0, or in | |
64 | * extremis just the first serial device we can find. But we | |
65 | * insist on having a console (even if it is silent). | |
66 | */ | |
91155c65 SG |
67 | #ifdef CONFIG_CONS_INDEX |
68 | #define INDEX (CONFIG_CONS_INDEX - 1) | |
69 | #else | |
70 | #define INDEX 0 | |
71 | #endif | |
e9fc0583 SG |
72 | if (!uclass_get_device_by_seq(UCLASS_SERIAL, INDEX, &dev) || |
73 | !uclass_get_device(UCLASS_SERIAL, INDEX, &dev) || | |
753812cb | 74 | (!uclass_first_device(UCLASS_SERIAL, &dev) && dev)) { |
e9fc0583 SG |
75 | gd->cur_serial_dev = dev; |
76 | return; | |
77 | } | |
91155c65 | 78 | #undef INDEX |
e9fc0583 SG |
79 | } |
80 | ||
8c458588 | 81 | #ifdef CONFIG_REQUIRE_SERIAL_CONSOLE |
e9fc0583 | 82 | panic_str("No serial driver found"); |
8c458588 | 83 | #endif |
57d92753 SG |
84 | } |
85 | ||
86 | /* Called prior to relocation */ | |
87 | int serial_init(void) | |
88 | { | |
89 | serial_find_console_or_panic(); | |
90 | gd->flags |= GD_FLG_SERIAL_READY; | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
95 | /* Called after relocation */ | |
96 | void serial_initialize(void) | |
97 | { | |
98 | serial_find_console_or_panic(); | |
99 | } | |
100 | ||
eea5a4cc | 101 | static void _serial_putc(struct udevice *dev, char ch) |
57d92753 | 102 | { |
bac64467 | 103 | struct dm_serial_ops *ops = serial_get_ops(dev); |
57d92753 SG |
104 | int err; |
105 | ||
106 | do { | |
bac64467 | 107 | err = ops->putc(dev, ch); |
57d92753 SG |
108 | } while (err == -EAGAIN); |
109 | if (ch == '\n') | |
eea5a4cc | 110 | _serial_putc(dev, '\r'); |
57d92753 SG |
111 | } |
112 | ||
eea5a4cc | 113 | static void _serial_puts(struct udevice *dev, const char *str) |
b8893327 | 114 | { |
eea5a4cc MY |
115 | while (*str) |
116 | _serial_putc(dev, *str++); | |
b8893327 SG |
117 | } |
118 | ||
eea5a4cc | 119 | static int _serial_getc(struct udevice *dev) |
57d92753 | 120 | { |
eea5a4cc MY |
121 | struct dm_serial_ops *ops = serial_get_ops(dev); |
122 | int err; | |
57d92753 | 123 | |
eea5a4cc MY |
124 | do { |
125 | err = ops->getc(dev); | |
126 | if (err == -EAGAIN) | |
127 | WATCHDOG_RESET(); | |
128 | } while (err == -EAGAIN); | |
57d92753 | 129 | |
eea5a4cc | 130 | return err >= 0 ? err : 0; |
57d92753 SG |
131 | } |
132 | ||
eea5a4cc | 133 | static int _serial_tstc(struct udevice *dev) |
57d92753 | 134 | { |
eea5a4cc | 135 | struct dm_serial_ops *ops = serial_get_ops(dev); |
57d92753 SG |
136 | |
137 | if (ops->pending) | |
eea5a4cc | 138 | return ops->pending(dev, true); |
57d92753 SG |
139 | |
140 | return 1; | |
141 | } | |
142 | ||
eea5a4cc | 143 | void serial_putc(char ch) |
57d92753 | 144 | { |
8c458588 HG |
145 | if (gd->cur_serial_dev) |
146 | _serial_putc(gd->cur_serial_dev, ch); | |
eea5a4cc | 147 | } |
57d92753 | 148 | |
eea5a4cc MY |
149 | void serial_puts(const char *str) |
150 | { | |
8c458588 HG |
151 | if (gd->cur_serial_dev) |
152 | _serial_puts(gd->cur_serial_dev, str); | |
57d92753 SG |
153 | } |
154 | ||
b8893327 SG |
155 | int serial_getc(void) |
156 | { | |
8c458588 HG |
157 | if (!gd->cur_serial_dev) |
158 | return 0; | |
159 | ||
469a579d | 160 | return _serial_getc(gd->cur_serial_dev); |
eea5a4cc MY |
161 | } |
162 | ||
163 | int serial_tstc(void) | |
164 | { | |
8c458588 HG |
165 | if (!gd->cur_serial_dev) |
166 | return 0; | |
167 | ||
469a579d | 168 | return _serial_tstc(gd->cur_serial_dev); |
eea5a4cc MY |
169 | } |
170 | ||
171 | void serial_setbrg(void) | |
172 | { | |
8c458588 HG |
173 | struct dm_serial_ops *ops; |
174 | ||
175 | if (!gd->cur_serial_dev) | |
176 | return; | |
eea5a4cc | 177 | |
8c458588 | 178 | ops = serial_get_ops(gd->cur_serial_dev); |
eea5a4cc | 179 | if (ops->setbrg) |
469a579d | 180 | ops->setbrg(gd->cur_serial_dev, gd->baudrate); |
b8893327 SG |
181 | } |
182 | ||
57d92753 SG |
183 | void serial_stdio_init(void) |
184 | { | |
185 | } | |
186 | ||
236f2bd3 | 187 | #ifdef CONFIG_DM_STDIO |
b8893327 | 188 | static void serial_stub_putc(struct stdio_dev *sdev, const char ch) |
57d92753 | 189 | { |
eea5a4cc | 190 | _serial_putc(sdev->priv, ch); |
57d92753 | 191 | } |
236f2bd3 | 192 | #endif |
57d92753 SG |
193 | |
194 | void serial_stub_puts(struct stdio_dev *sdev, const char *str) | |
195 | { | |
eea5a4cc | 196 | _serial_puts(sdev->priv, str); |
57d92753 SG |
197 | } |
198 | ||
199 | int serial_stub_getc(struct stdio_dev *sdev) | |
200 | { | |
eea5a4cc | 201 | return _serial_getc(sdev->priv); |
57d92753 SG |
202 | } |
203 | ||
204 | int serial_stub_tstc(struct stdio_dev *sdev) | |
205 | { | |
eea5a4cc | 206 | return _serial_tstc(sdev->priv); |
57d92753 SG |
207 | } |
208 | ||
ad1b81c8 SG |
209 | /** |
210 | * on_baudrate() - Update the actual baudrate when the env var changes | |
211 | * | |
212 | * This will check for a valid baudrate and only apply it if valid. | |
213 | */ | |
214 | static int on_baudrate(const char *name, const char *value, enum env_op op, | |
215 | int flags) | |
216 | { | |
217 | int i; | |
218 | int baudrate; | |
219 | ||
220 | switch (op) { | |
221 | case env_op_create: | |
222 | case env_op_overwrite: | |
223 | /* | |
224 | * Switch to new baudrate if new baudrate is supported | |
225 | */ | |
226 | baudrate = simple_strtoul(value, NULL, 10); | |
227 | ||
228 | /* Not actually changing */ | |
229 | if (gd->baudrate == baudrate) | |
230 | return 0; | |
231 | ||
232 | for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) { | |
233 | if (baudrate == baudrate_table[i]) | |
234 | break; | |
235 | } | |
236 | if (i == ARRAY_SIZE(baudrate_table)) { | |
237 | if ((flags & H_FORCE) == 0) | |
238 | printf("## Baudrate %d bps not supported\n", | |
239 | baudrate); | |
240 | return 1; | |
241 | } | |
242 | if ((flags & H_INTERACTIVE) != 0) { | |
243 | printf("## Switch baudrate to %d bps and press ENTER ...\n", | |
244 | baudrate); | |
245 | udelay(50000); | |
246 | } | |
247 | ||
248 | gd->baudrate = baudrate; | |
249 | ||
250 | serial_setbrg(); | |
251 | ||
252 | udelay(50000); | |
253 | ||
254 | if ((flags & H_INTERACTIVE) != 0) | |
255 | while (1) { | |
256 | if (getc() == '\r') | |
257 | break; | |
258 | } | |
259 | ||
260 | return 0; | |
261 | case env_op_delete: | |
262 | printf("## Baudrate may not be deleted\n"); | |
263 | return 1; | |
264 | default: | |
265 | return 0; | |
266 | } | |
267 | } | |
268 | U_BOOT_ENV_CALLBACK(baudrate, on_baudrate); | |
269 | ||
57d92753 SG |
270 | static int serial_post_probe(struct udevice *dev) |
271 | { | |
57d92753 | 272 | struct dm_serial_ops *ops = serial_get_ops(dev); |
236f2bd3 | 273 | #ifdef CONFIG_DM_STDIO |
e564f054 | 274 | struct serial_dev_priv *upriv = dev_get_uclass_priv(dev); |
236f2bd3 SG |
275 | struct stdio_dev sdev; |
276 | #endif | |
57d92753 SG |
277 | int ret; |
278 | ||
484fdf5b MS |
279 | #if defined(CONFIG_NEEDS_MANUAL_RELOC) |
280 | if (ops->setbrg) | |
281 | ops->setbrg += gd->reloc_off; | |
282 | if (ops->getc) | |
283 | ops->getc += gd->reloc_off; | |
284 | if (ops->putc) | |
285 | ops->putc += gd->reloc_off; | |
286 | if (ops->pending) | |
287 | ops->pending += gd->reloc_off; | |
288 | if (ops->clear) | |
289 | ops->clear += gd->reloc_off; | |
290 | #if CONFIG_POST & CONFIG_SYS_POST_UART | |
291 | if (ops->loop) | |
292 | ops->loop += gd->reloc_off | |
293 | #endif | |
294 | #endif | |
57d92753 SG |
295 | /* Set the baud rate */ |
296 | if (ops->setbrg) { | |
297 | ret = ops->setbrg(dev, gd->baudrate); | |
298 | if (ret) | |
299 | return ret; | |
300 | } | |
301 | ||
236f2bd3 | 302 | #ifdef CONFIG_DM_STDIO |
57d92753 SG |
303 | if (!(gd->flags & GD_FLG_RELOC)) |
304 | return 0; | |
57d92753 SG |
305 | memset(&sdev, '\0', sizeof(sdev)); |
306 | ||
307 | strncpy(sdev.name, dev->name, sizeof(sdev.name)); | |
308 | sdev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT; | |
309 | sdev.priv = dev; | |
310 | sdev.putc = serial_stub_putc; | |
311 | sdev.puts = serial_stub_puts; | |
312 | sdev.getc = serial_stub_getc; | |
313 | sdev.tstc = serial_stub_tstc; | |
314 | stdio_register_dev(&sdev, &upriv->sdev); | |
236f2bd3 | 315 | #endif |
57d92753 SG |
316 | return 0; |
317 | } | |
318 | ||
319 | static int serial_pre_remove(struct udevice *dev) | |
320 | { | |
321 | #ifdef CONFIG_SYS_STDIO_DEREGISTER | |
e564f054 | 322 | struct serial_dev_priv *upriv = dev_get_uclass_priv(dev); |
57d92753 | 323 | |
4a74298c | 324 | if (stdio_deregister_dev(upriv->sdev, 0)) |
57d92753 SG |
325 | return -EPERM; |
326 | #endif | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | UCLASS_DRIVER(serial) = { | |
332 | .id = UCLASS_SERIAL, | |
333 | .name = "serial", | |
9cc36a2b | 334 | .flags = DM_UC_FLAG_SEQ_ALIAS, |
57d92753 SG |
335 | .post_probe = serial_post_probe, |
336 | .pre_remove = serial_pre_remove, | |
337 | .per_device_auto_alloc_size = sizeof(struct serial_dev_priv), | |
338 | }; |