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)
35 if (OF_CONTROL && gd->fdt_blob) {
36 /* Check for a chosen console */
37 node = fdtdec_get_chosen_node(gd->fdt_blob, "stdout-path");
39 node = fdt_path_offset(gd->fdt_blob, "console");
40 if (!uclass_get_device_by_of_offset(UCLASS_SERIAL, node,
42 gd->cur_serial_dev = dev;
47 * If the console is not marked to be bound before relocation,
51 !lists_bind_fdt(gd->dm_root, gd->fdt_blob, node, &dev)) {
52 if (!device_probe(dev)) {
53 gd->cur_serial_dev = dev;
58 if (!SPL_BUILD || !OF_CONTROL || !gd->fdt_blob) {
60 * Try to use CONFIG_CONS_INDEX if available (it is numbered
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).
67 #ifdef CONFIG_CONS_INDEX
68 #define INDEX (CONFIG_CONS_INDEX - 1)
72 if (!uclass_get_device_by_seq(UCLASS_SERIAL, INDEX, &dev) ||
73 !uclass_get_device(UCLASS_SERIAL, INDEX, &dev) ||
74 (!uclass_first_device(UCLASS_SERIAL, &dev) || dev)) {
75 gd->cur_serial_dev = dev;
81 panic_str("No serial driver found");
84 /* Called prior to relocation */
87 serial_find_console_or_panic();
88 gd->flags |= GD_FLG_SERIAL_READY;
93 /* Called after relocation */
94 void serial_initialize(void)
96 serial_find_console_or_panic();
99 static void _serial_putc(struct udevice *dev, char ch)
101 struct dm_serial_ops *ops = serial_get_ops(dev);
105 err = ops->putc(dev, ch);
106 } while (err == -EAGAIN);
108 _serial_putc(dev, '\r');
111 static void _serial_puts(struct udevice *dev, const char *str)
114 _serial_putc(dev, *str++);
117 static int _serial_getc(struct udevice *dev)
119 struct dm_serial_ops *ops = serial_get_ops(dev);
123 err = ops->getc(dev);
126 } while (err == -EAGAIN);
128 return err >= 0 ? err : 0;
131 static int _serial_tstc(struct udevice *dev)
133 struct dm_serial_ops *ops = serial_get_ops(dev);
136 return ops->pending(dev, true);
141 void serial_putc(char ch)
143 _serial_putc(gd->cur_serial_dev, ch);
146 void serial_puts(const char *str)
148 _serial_puts(gd->cur_serial_dev, str);
151 int serial_getc(void)
153 return _serial_getc(gd->cur_serial_dev);
156 int serial_tstc(void)
158 return _serial_tstc(gd->cur_serial_dev);
161 void serial_setbrg(void)
163 struct dm_serial_ops *ops = serial_get_ops(gd->cur_serial_dev);
166 ops->setbrg(gd->cur_serial_dev, gd->baudrate);
169 void serial_stdio_init(void)
173 #ifdef CONFIG_DM_STDIO
174 static void serial_stub_putc(struct stdio_dev *sdev, const char ch)
176 _serial_putc(sdev->priv, ch);
180 void serial_stub_puts(struct stdio_dev *sdev, const char *str)
182 _serial_puts(sdev->priv, str);
185 int serial_stub_getc(struct stdio_dev *sdev)
187 return _serial_getc(sdev->priv);
190 int serial_stub_tstc(struct stdio_dev *sdev)
192 return _serial_tstc(sdev->priv);
196 * on_baudrate() - Update the actual baudrate when the env var changes
198 * This will check for a valid baudrate and only apply it if valid.
200 static int on_baudrate(const char *name, const char *value, enum env_op op,
208 case env_op_overwrite:
210 * Switch to new baudrate if new baudrate is supported
212 baudrate = simple_strtoul(value, NULL, 10);
214 /* Not actually changing */
215 if (gd->baudrate == baudrate)
218 for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) {
219 if (baudrate == baudrate_table[i])
222 if (i == ARRAY_SIZE(baudrate_table)) {
223 if ((flags & H_FORCE) == 0)
224 printf("## Baudrate %d bps not supported\n",
228 if ((flags & H_INTERACTIVE) != 0) {
229 printf("## Switch baudrate to %d bps and press ENTER ...\n",
234 gd->baudrate = baudrate;
240 if ((flags & H_INTERACTIVE) != 0)
248 printf("## Baudrate may not be deleted\n");
254 U_BOOT_ENV_CALLBACK(baudrate, on_baudrate);
256 static int serial_post_probe(struct udevice *dev)
258 struct dm_serial_ops *ops = serial_get_ops(dev);
259 #ifdef CONFIG_DM_STDIO
260 struct serial_dev_priv *upriv = dev_get_uclass_priv(dev);
261 struct stdio_dev sdev;
265 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
267 ops->setbrg += gd->reloc_off;
269 ops->getc += gd->reloc_off;
271 ops->putc += gd->reloc_off;
273 ops->pending += gd->reloc_off;
275 ops->clear += gd->reloc_off;
276 #if CONFIG_POST & CONFIG_SYS_POST_UART
278 ops->loop += gd->reloc_off
281 /* Set the baud rate */
283 ret = ops->setbrg(dev, gd->baudrate);
288 #ifdef CONFIG_DM_STDIO
289 if (!(gd->flags & GD_FLG_RELOC))
291 memset(&sdev, '\0', sizeof(sdev));
293 strncpy(sdev.name, dev->name, sizeof(sdev.name));
294 sdev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
296 sdev.putc = serial_stub_putc;
297 sdev.puts = serial_stub_puts;
298 sdev.getc = serial_stub_getc;
299 sdev.tstc = serial_stub_tstc;
300 stdio_register_dev(&sdev, &upriv->sdev);
305 static int serial_pre_remove(struct udevice *dev)
307 #ifdef CONFIG_SYS_STDIO_DEREGISTER
308 struct serial_dev_priv *upriv = dev_get_uclass_priv(dev);
310 if (stdio_deregister_dev(upriv->sdev, 0))
317 UCLASS_DRIVER(serial) = {
320 .flags = DM_UC_FLAG_SEQ_ALIAS,
321 .post_probe = serial_post_probe,
322 .pre_remove = serial_pre_remove,
323 .per_device_auto_alloc_size = sizeof(struct serial_dev_priv),