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)
34 #ifdef CONFIG_OF_CONTROL
37 /* Check for a chosen console */
38 node = fdtdec_get_chosen_node(gd->fdt_blob, "stdout-path");
40 node = fdt_path_offset(gd->fdt_blob, "console");
41 if (!uclass_get_device_by_of_offset(UCLASS_SERIAL, node, &dev)) {
42 gd->cur_serial_dev = dev;
47 * If the console is not marked to be bound before relocation, bind
51 !lists_bind_fdt(gd->dm_root, gd->fdt_blob, node, &dev)) {
52 if (!device_probe(dev)) {
53 gd->cur_serial_dev = dev;
59 * Try to use CONFIG_CONS_INDEX if available (it is numbered from 1!).
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).
65 #ifdef CONFIG_CONS_INDEX
66 #define INDEX (CONFIG_CONS_INDEX - 1)
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))
73 panic_str("No serial driver found");
75 gd->cur_serial_dev = dev;
78 /* Called prior to relocation */
81 serial_find_console_or_panic();
82 gd->flags |= GD_FLG_SERIAL_READY;
87 /* Called after relocation */
88 void serial_initialize(void)
90 serial_find_console_or_panic();
93 static void _serial_putc(struct udevice *dev, char ch)
95 struct dm_serial_ops *ops = serial_get_ops(dev);
99 err = ops->putc(dev, ch);
100 } while (err == -EAGAIN);
102 _serial_putc(dev, '\r');
105 static void _serial_puts(struct udevice *dev, const char *str)
108 _serial_putc(dev, *str++);
111 static int _serial_getc(struct udevice *dev)
113 struct dm_serial_ops *ops = serial_get_ops(dev);
117 err = ops->getc(dev);
120 } while (err == -EAGAIN);
122 return err >= 0 ? err : 0;
125 static int _serial_tstc(struct udevice *dev)
127 struct dm_serial_ops *ops = serial_get_ops(dev);
130 return ops->pending(dev, true);
135 void serial_putc(char ch)
137 _serial_putc(gd->cur_serial_dev, ch);
140 void serial_puts(const char *str)
142 _serial_puts(gd->cur_serial_dev, str);
145 int serial_getc(void)
147 return _serial_getc(gd->cur_serial_dev);
150 int serial_tstc(void)
152 return _serial_tstc(gd->cur_serial_dev);
155 void serial_setbrg(void)
157 struct dm_serial_ops *ops = serial_get_ops(gd->cur_serial_dev);
160 ops->setbrg(gd->cur_serial_dev, gd->baudrate);
163 void serial_stdio_init(void)
167 #ifdef CONFIG_DM_STDIO
168 static void serial_stub_putc(struct stdio_dev *sdev, const char ch)
170 _serial_putc(sdev->priv, ch);
174 void serial_stub_puts(struct stdio_dev *sdev, const char *str)
176 _serial_puts(sdev->priv, str);
179 int serial_stub_getc(struct stdio_dev *sdev)
181 return _serial_getc(sdev->priv);
184 int serial_stub_tstc(struct stdio_dev *sdev)
186 return _serial_tstc(sdev->priv);
190 * on_baudrate() - Update the actual baudrate when the env var changes
192 * This will check for a valid baudrate and only apply it if valid.
194 static int on_baudrate(const char *name, const char *value, enum env_op op,
202 case env_op_overwrite:
204 * Switch to new baudrate if new baudrate is supported
206 baudrate = simple_strtoul(value, NULL, 10);
208 /* Not actually changing */
209 if (gd->baudrate == baudrate)
212 for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) {
213 if (baudrate == baudrate_table[i])
216 if (i == ARRAY_SIZE(baudrate_table)) {
217 if ((flags & H_FORCE) == 0)
218 printf("## Baudrate %d bps not supported\n",
222 if ((flags & H_INTERACTIVE) != 0) {
223 printf("## Switch baudrate to %d bps and press ENTER ...\n",
228 gd->baudrate = baudrate;
234 if ((flags & H_INTERACTIVE) != 0)
242 printf("## Baudrate may not be deleted\n");
248 U_BOOT_ENV_CALLBACK(baudrate, on_baudrate);
250 static int serial_post_probe(struct udevice *dev)
252 struct dm_serial_ops *ops = serial_get_ops(dev);
253 #ifdef CONFIG_DM_STDIO
254 struct serial_dev_priv *upriv = dev_get_uclass_priv(dev);
255 struct stdio_dev sdev;
259 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
261 ops->setbrg += gd->reloc_off;
263 ops->getc += gd->reloc_off;
265 ops->putc += gd->reloc_off;
267 ops->pending += gd->reloc_off;
269 ops->clear += gd->reloc_off;
270 #if CONFIG_POST & CONFIG_SYS_POST_UART
272 ops->loop += gd->reloc_off
275 /* Set the baud rate */
277 ret = ops->setbrg(dev, gd->baudrate);
282 #ifdef CONFIG_DM_STDIO
283 if (!(gd->flags & GD_FLG_RELOC))
285 memset(&sdev, '\0', sizeof(sdev));
287 strncpy(sdev.name, dev->name, sizeof(sdev.name));
288 sdev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
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);
299 static int serial_pre_remove(struct udevice *dev)
301 #ifdef CONFIG_SYS_STDIO_DEREGISTER
302 struct serial_dev_priv *upriv = dev_get_uclass_priv(dev);
304 if (stdio_deregister_dev(upriv->sdev, 0))
311 UCLASS_DRIVER(serial) = {
314 .flags = DM_UC_FLAG_SEQ_ALIAS,
315 .post_probe = serial_post_probe,
316 .pre_remove = serial_pre_remove,
317 .per_device_auto_alloc_size = sizeof(struct serial_dev_priv),