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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 SG |
32 | struct udevice *dev; |
33 | ||
59990bf0 | 34 | #ifdef CONFIG_OF_CONTROL |
57d92753 SG |
35 | int node; |
36 | ||
37 | /* Check for a chosen console */ | |
38 | node = fdtdec_get_chosen_node(gd->fdt_blob, "stdout-path"); | |
39 | if (node < 0) | |
0bd4e39d | 40 | node = fdt_path_offset(gd->fdt_blob, "console"); |
469a579d SG |
41 | if (!uclass_get_device_by_of_offset(UCLASS_SERIAL, node, &dev)) { |
42 | gd->cur_serial_dev = dev; | |
57d92753 | 43 | return; |
469a579d | 44 | } |
57d92753 SG |
45 | |
46 | /* | |
47 | * If the console is not marked to be bound before relocation, bind | |
48 | * it anyway. | |
49 | */ | |
50 | if (node > 0 && | |
469a579d SG |
51 | !lists_bind_fdt(gd->dm_root, gd->fdt_blob, node, &dev)) { |
52 | if (!device_probe(dev)) { | |
53 | gd->cur_serial_dev = dev; | |
57d92753 | 54 | return; |
469a579d | 55 | } |
57d92753 | 56 | } |
59990bf0 | 57 | #endif |
57d92753 | 58 | /* |
91155c65 SG |
59 | * Try to use CONFIG_CONS_INDEX if available (it is numbered from 1!). |
60 | * | |
57d92753 SG |
61 | * Failing that, get the device with sequence number 0, or in extremis |
62 | * just the first serial device we can find. But we insist on having | |
63 | * a console (even if it is silent). | |
64 | */ | |
91155c65 SG |
65 | #ifdef CONFIG_CONS_INDEX |
66 | #define INDEX (CONFIG_CONS_INDEX - 1) | |
67 | #else | |
68 | #define INDEX 0 | |
69 | #endif | |
469a579d SG |
70 | if (uclass_get_device_by_seq(UCLASS_SERIAL, INDEX, &dev) && |
71 | uclass_get_device(UCLASS_SERIAL, INDEX, &dev) && | |
72 | (uclass_first_device(UCLASS_SERIAL, &dev) || !dev)) | |
57d92753 | 73 | panic("No serial driver found"); |
91155c65 | 74 | #undef INDEX |
469a579d | 75 | gd->cur_serial_dev = dev; |
57d92753 SG |
76 | } |
77 | ||
78 | /* Called prior to relocation */ | |
79 | int serial_init(void) | |
80 | { | |
81 | serial_find_console_or_panic(); | |
82 | gd->flags |= GD_FLG_SERIAL_READY; | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | /* Called after relocation */ | |
88 | void serial_initialize(void) | |
89 | { | |
90 | serial_find_console_or_panic(); | |
91 | } | |
92 | ||
eea5a4cc | 93 | static void _serial_putc(struct udevice *dev, char ch) |
57d92753 | 94 | { |
bac64467 | 95 | struct dm_serial_ops *ops = serial_get_ops(dev); |
57d92753 SG |
96 | int err; |
97 | ||
98 | do { | |
bac64467 | 99 | err = ops->putc(dev, ch); |
57d92753 SG |
100 | } while (err == -EAGAIN); |
101 | if (ch == '\n') | |
eea5a4cc | 102 | _serial_putc(dev, '\r'); |
57d92753 SG |
103 | } |
104 | ||
eea5a4cc | 105 | static void _serial_puts(struct udevice *dev, const char *str) |
b8893327 | 106 | { |
eea5a4cc MY |
107 | while (*str) |
108 | _serial_putc(dev, *str++); | |
b8893327 SG |
109 | } |
110 | ||
eea5a4cc | 111 | static int _serial_getc(struct udevice *dev) |
57d92753 | 112 | { |
eea5a4cc MY |
113 | struct dm_serial_ops *ops = serial_get_ops(dev); |
114 | int err; | |
57d92753 | 115 | |
eea5a4cc MY |
116 | do { |
117 | err = ops->getc(dev); | |
118 | if (err == -EAGAIN) | |
119 | WATCHDOG_RESET(); | |
120 | } while (err == -EAGAIN); | |
57d92753 | 121 | |
eea5a4cc | 122 | return err >= 0 ? err : 0; |
57d92753 SG |
123 | } |
124 | ||
eea5a4cc | 125 | static int _serial_tstc(struct udevice *dev) |
57d92753 | 126 | { |
eea5a4cc | 127 | struct dm_serial_ops *ops = serial_get_ops(dev); |
57d92753 SG |
128 | |
129 | if (ops->pending) | |
eea5a4cc | 130 | return ops->pending(dev, true); |
57d92753 SG |
131 | |
132 | return 1; | |
133 | } | |
134 | ||
eea5a4cc | 135 | void serial_putc(char ch) |
57d92753 | 136 | { |
469a579d | 137 | _serial_putc(gd->cur_serial_dev, ch); |
eea5a4cc | 138 | } |
57d92753 | 139 | |
eea5a4cc MY |
140 | void serial_puts(const char *str) |
141 | { | |
469a579d | 142 | _serial_puts(gd->cur_serial_dev, str); |
57d92753 SG |
143 | } |
144 | ||
b8893327 SG |
145 | int serial_getc(void) |
146 | { | |
469a579d | 147 | return _serial_getc(gd->cur_serial_dev); |
eea5a4cc MY |
148 | } |
149 | ||
150 | int serial_tstc(void) | |
151 | { | |
469a579d | 152 | return _serial_tstc(gd->cur_serial_dev); |
eea5a4cc MY |
153 | } |
154 | ||
155 | void serial_setbrg(void) | |
156 | { | |
469a579d | 157 | struct dm_serial_ops *ops = serial_get_ops(gd->cur_serial_dev); |
eea5a4cc MY |
158 | |
159 | if (ops->setbrg) | |
469a579d | 160 | ops->setbrg(gd->cur_serial_dev, gd->baudrate); |
b8893327 SG |
161 | } |
162 | ||
57d92753 SG |
163 | void serial_stdio_init(void) |
164 | { | |
165 | } | |
166 | ||
236f2bd3 | 167 | #ifdef CONFIG_DM_STDIO |
b8893327 | 168 | static void serial_stub_putc(struct stdio_dev *sdev, const char ch) |
57d92753 | 169 | { |
eea5a4cc | 170 | _serial_putc(sdev->priv, ch); |
57d92753 | 171 | } |
236f2bd3 | 172 | #endif |
57d92753 SG |
173 | |
174 | void serial_stub_puts(struct stdio_dev *sdev, const char *str) | |
175 | { | |
eea5a4cc | 176 | _serial_puts(sdev->priv, str); |
57d92753 SG |
177 | } |
178 | ||
179 | int serial_stub_getc(struct stdio_dev *sdev) | |
180 | { | |
eea5a4cc | 181 | return _serial_getc(sdev->priv); |
57d92753 SG |
182 | } |
183 | ||
184 | int serial_stub_tstc(struct stdio_dev *sdev) | |
185 | { | |
eea5a4cc | 186 | return _serial_tstc(sdev->priv); |
57d92753 SG |
187 | } |
188 | ||
ad1b81c8 SG |
189 | /** |
190 | * on_baudrate() - Update the actual baudrate when the env var changes | |
191 | * | |
192 | * This will check for a valid baudrate and only apply it if valid. | |
193 | */ | |
194 | static int on_baudrate(const char *name, const char *value, enum env_op op, | |
195 | int flags) | |
196 | { | |
197 | int i; | |
198 | int baudrate; | |
199 | ||
200 | switch (op) { | |
201 | case env_op_create: | |
202 | case env_op_overwrite: | |
203 | /* | |
204 | * Switch to new baudrate if new baudrate is supported | |
205 | */ | |
206 | baudrate = simple_strtoul(value, NULL, 10); | |
207 | ||
208 | /* Not actually changing */ | |
209 | if (gd->baudrate == baudrate) | |
210 | return 0; | |
211 | ||
212 | for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) { | |
213 | if (baudrate == baudrate_table[i]) | |
214 | break; | |
215 | } | |
216 | if (i == ARRAY_SIZE(baudrate_table)) { | |
217 | if ((flags & H_FORCE) == 0) | |
218 | printf("## Baudrate %d bps not supported\n", | |
219 | baudrate); | |
220 | return 1; | |
221 | } | |
222 | if ((flags & H_INTERACTIVE) != 0) { | |
223 | printf("## Switch baudrate to %d bps and press ENTER ...\n", | |
224 | baudrate); | |
225 | udelay(50000); | |
226 | } | |
227 | ||
228 | gd->baudrate = baudrate; | |
229 | ||
230 | serial_setbrg(); | |
231 | ||
232 | udelay(50000); | |
233 | ||
234 | if ((flags & H_INTERACTIVE) != 0) | |
235 | while (1) { | |
236 | if (getc() == '\r') | |
237 | break; | |
238 | } | |
239 | ||
240 | return 0; | |
241 | case env_op_delete: | |
242 | printf("## Baudrate may not be deleted\n"); | |
243 | return 1; | |
244 | default: | |
245 | return 0; | |
246 | } | |
247 | } | |
248 | U_BOOT_ENV_CALLBACK(baudrate, on_baudrate); | |
249 | ||
57d92753 SG |
250 | static int serial_post_probe(struct udevice *dev) |
251 | { | |
57d92753 | 252 | struct dm_serial_ops *ops = serial_get_ops(dev); |
236f2bd3 | 253 | #ifdef CONFIG_DM_STDIO |
57d92753 | 254 | struct serial_dev_priv *upriv = dev->uclass_priv; |
236f2bd3 SG |
255 | struct stdio_dev sdev; |
256 | #endif | |
57d92753 SG |
257 | int ret; |
258 | ||
484fdf5b MS |
259 | #if defined(CONFIG_NEEDS_MANUAL_RELOC) |
260 | if (ops->setbrg) | |
261 | ops->setbrg += gd->reloc_off; | |
262 | if (ops->getc) | |
263 | ops->getc += gd->reloc_off; | |
264 | if (ops->putc) | |
265 | ops->putc += gd->reloc_off; | |
266 | if (ops->pending) | |
267 | ops->pending += gd->reloc_off; | |
268 | if (ops->clear) | |
269 | ops->clear += gd->reloc_off; | |
270 | #if CONFIG_POST & CONFIG_SYS_POST_UART | |
271 | if (ops->loop) | |
272 | ops->loop += gd->reloc_off | |
273 | #endif | |
274 | #endif | |
57d92753 SG |
275 | /* Set the baud rate */ |
276 | if (ops->setbrg) { | |
277 | ret = ops->setbrg(dev, gd->baudrate); | |
278 | if (ret) | |
279 | return ret; | |
280 | } | |
281 | ||
236f2bd3 | 282 | #ifdef CONFIG_DM_STDIO |
57d92753 SG |
283 | if (!(gd->flags & GD_FLG_RELOC)) |
284 | return 0; | |
57d92753 SG |
285 | memset(&sdev, '\0', sizeof(sdev)); |
286 | ||
287 | strncpy(sdev.name, dev->name, sizeof(sdev.name)); | |
288 | sdev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT; | |
289 | sdev.priv = dev; | |
290 | sdev.putc = serial_stub_putc; | |
291 | sdev.puts = serial_stub_puts; | |
292 | sdev.getc = serial_stub_getc; | |
293 | sdev.tstc = serial_stub_tstc; | |
294 | stdio_register_dev(&sdev, &upriv->sdev); | |
236f2bd3 | 295 | #endif |
57d92753 SG |
296 | return 0; |
297 | } | |
298 | ||
299 | static int serial_pre_remove(struct udevice *dev) | |
300 | { | |
301 | #ifdef CONFIG_SYS_STDIO_DEREGISTER | |
302 | struct serial_dev_priv *upriv = dev->uclass_priv; | |
303 | ||
4a74298c | 304 | if (stdio_deregister_dev(upriv->sdev, 0)) |
57d92753 SG |
305 | return -EPERM; |
306 | #endif | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
311 | UCLASS_DRIVER(serial) = { | |
312 | .id = UCLASS_SERIAL, | |
313 | .name = "serial", | |
9cc36a2b | 314 | .flags = DM_UC_FLAG_SEQ_ALIAS, |
57d92753 SG |
315 | .post_probe = serial_post_probe, |
316 | .pre_remove = serial_pre_remove, | |
317 | .per_device_auto_alloc_size = sizeof(struct serial_dev_priv), | |
318 | }; |