2 * Copyright (c) 2014 The Chromium OS Authors.
4 * SPDX-License-Identifier: GPL-2.0+
9 #include <environment.h>
14 #include <stdio_dev.h>
17 #include <dm/device-internal.h>
19 DECLARE_GLOBAL_DATA_PTR;
22 * Table with supported baudrates (defined in config_xyz.h)
24 static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE;
26 #ifndef CONFIG_SYS_MALLOC_F_LEN
27 #error "Serial is required before relocation - define CONFIG_SYS_MALLOC_F_LEN to make this work"
30 static void serial_find_console_or_panic(void)
32 const void *blob = gd->fdt_blob;
36 if (CONFIG_IS_ENABLED(OF_CONTROL) && blob) {
37 /* Check for a chosen console */
38 node = fdtdec_get_chosen_node(blob, "stdout-path");
40 const char *str, *p, *name;
43 * Deal with things like
44 * stdout-path = "serial0:115200n8";
46 * We need to look up the alias and then follow it to
49 str = fdtdec_get_chosen_prop(blob, "stdout-path");
52 name = fdt_get_alias_namelen(blob, str,
53 p ? p - str : strlen(str));
55 node = fdt_path_offset(blob, name);
59 node = fdt_path_offset(blob, "console");
60 if (!uclass_get_device_by_of_offset(UCLASS_SERIAL, node,
62 gd->cur_serial_dev = dev;
67 * If the console is not marked to be bound before relocation,
71 !lists_bind_fdt(gd->dm_root, blob, node, &dev)) {
72 if (!device_probe(dev)) {
73 gd->cur_serial_dev = dev;
78 if (!SPL_BUILD || !CONFIG_IS_ENABLED(OF_CONTROL) || !blob) {
80 * Try to use CONFIG_CONS_INDEX if available (it is numbered
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).
87 #ifdef CONFIG_CONS_INDEX
88 #define INDEX (CONFIG_CONS_INDEX - 1)
92 if (!uclass_get_device_by_seq(UCLASS_SERIAL, INDEX, &dev) ||
93 !uclass_get_device(UCLASS_SERIAL, INDEX, &dev) ||
94 (!uclass_first_device(UCLASS_SERIAL, &dev) && dev)) {
95 gd->cur_serial_dev = dev;
101 #ifdef CONFIG_REQUIRE_SERIAL_CONSOLE
102 panic_str("No serial driver found");
106 /* Called prior to relocation */
107 int serial_init(void)
109 serial_find_console_or_panic();
110 gd->flags |= GD_FLG_SERIAL_READY;
115 /* Called after relocation */
116 void serial_initialize(void)
121 static void _serial_putc(struct udevice *dev, char ch)
123 struct dm_serial_ops *ops = serial_get_ops(dev);
127 _serial_putc(dev, '\r');
130 err = ops->putc(dev, ch);
131 } while (err == -EAGAIN);
134 static void _serial_puts(struct udevice *dev, const char *str)
137 _serial_putc(dev, *str++);
140 static int _serial_getc(struct udevice *dev)
142 struct dm_serial_ops *ops = serial_get_ops(dev);
146 err = ops->getc(dev);
149 } while (err == -EAGAIN);
151 return err >= 0 ? err : 0;
154 static int _serial_tstc(struct udevice *dev)
156 struct dm_serial_ops *ops = serial_get_ops(dev);
159 return ops->pending(dev, true);
164 void serial_putc(char ch)
166 if (gd->cur_serial_dev)
167 _serial_putc(gd->cur_serial_dev, ch);
170 void serial_puts(const char *str)
172 if (gd->cur_serial_dev)
173 _serial_puts(gd->cur_serial_dev, str);
176 int serial_getc(void)
178 if (!gd->cur_serial_dev)
181 return _serial_getc(gd->cur_serial_dev);
184 int serial_tstc(void)
186 if (!gd->cur_serial_dev)
189 return _serial_tstc(gd->cur_serial_dev);
192 void serial_setbrg(void)
194 struct dm_serial_ops *ops;
196 if (!gd->cur_serial_dev)
199 ops = serial_get_ops(gd->cur_serial_dev);
201 ops->setbrg(gd->cur_serial_dev, gd->baudrate);
204 void serial_stdio_init(void)
208 #if defined(CONFIG_DM_STDIO) && CONFIG_IS_ENABLED(SERIAL_PRESENT)
209 static void serial_stub_putc(struct stdio_dev *sdev, const char ch)
211 _serial_putc(sdev->priv, ch);
215 void serial_stub_puts(struct stdio_dev *sdev, const char *str)
217 _serial_puts(sdev->priv, str);
220 int serial_stub_getc(struct stdio_dev *sdev)
222 return _serial_getc(sdev->priv);
225 int serial_stub_tstc(struct stdio_dev *sdev)
227 return _serial_tstc(sdev->priv);
231 * on_baudrate() - Update the actual baudrate when the env var changes
233 * This will check for a valid baudrate and only apply it if valid.
235 static int on_baudrate(const char *name, const char *value, enum env_op op,
243 case env_op_overwrite:
245 * Switch to new baudrate if new baudrate is supported
247 baudrate = simple_strtoul(value, NULL, 10);
249 /* Not actually changing */
250 if (gd->baudrate == baudrate)
253 for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) {
254 if (baudrate == baudrate_table[i])
257 if (i == ARRAY_SIZE(baudrate_table)) {
258 if ((flags & H_FORCE) == 0)
259 printf("## Baudrate %d bps not supported\n",
263 if ((flags & H_INTERACTIVE) != 0) {
264 printf("## Switch baudrate to %d bps and press ENTER ...\n",
269 gd->baudrate = baudrate;
275 if ((flags & H_INTERACTIVE) != 0)
283 printf("## Baudrate may not be deleted\n");
289 U_BOOT_ENV_CALLBACK(baudrate, on_baudrate);
291 #if CONFIG_IS_ENABLED(SERIAL_PRESENT)
292 static int serial_post_probe(struct udevice *dev)
294 struct dm_serial_ops *ops = serial_get_ops(dev);
295 #ifdef CONFIG_DM_STDIO
296 struct serial_dev_priv *upriv = dev_get_uclass_priv(dev);
297 struct stdio_dev sdev;
301 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
303 ops->setbrg += gd->reloc_off;
305 ops->getc += gd->reloc_off;
307 ops->putc += gd->reloc_off;
309 ops->pending += gd->reloc_off;
311 ops->clear += gd->reloc_off;
312 #if CONFIG_POST & CONFIG_SYS_POST_UART
314 ops->loop += gd->reloc_off
317 /* Set the baud rate */
319 ret = ops->setbrg(dev, gd->baudrate);
324 #ifdef CONFIG_DM_STDIO
325 if (!(gd->flags & GD_FLG_RELOC))
327 memset(&sdev, '\0', sizeof(sdev));
329 strncpy(sdev.name, dev->name, sizeof(sdev.name));
330 sdev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
332 sdev.putc = serial_stub_putc;
333 sdev.puts = serial_stub_puts;
334 sdev.getc = serial_stub_getc;
335 sdev.tstc = serial_stub_tstc;
336 stdio_register_dev(&sdev, &upriv->sdev);
341 static int serial_pre_remove(struct udevice *dev)
343 #ifdef CONFIG_SYS_STDIO_DEREGISTER
344 struct serial_dev_priv *upriv = dev_get_uclass_priv(dev);
346 if (stdio_deregister_dev(upriv->sdev, 0))
353 UCLASS_DRIVER(serial) = {
356 .flags = DM_UC_FLAG_SEQ_ALIAS,
357 .post_probe = serial_post_probe,
358 .pre_remove = serial_pre_remove,
359 .per_device_auto_alloc_size = sizeof(struct serial_dev_priv),