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 (CONFIG_IS_ENABLED(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 || !CONFIG_IS_ENABLED(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 #ifdef CONFIG_REQUIRE_SERIAL_CONSOLE
82 panic_str("No serial driver found");
86 /* Called prior to relocation */
89 serial_find_console_or_panic();
90 gd->flags |= GD_FLG_SERIAL_READY;
95 /* Called after relocation */
96 void serial_initialize(void)
98 serial_find_console_or_panic();
101 static void _serial_putc(struct udevice *dev, char ch)
103 struct dm_serial_ops *ops = serial_get_ops(dev);
107 err = ops->putc(dev, ch);
108 } while (err == -EAGAIN);
110 _serial_putc(dev, '\r');
113 static void _serial_puts(struct udevice *dev, const char *str)
116 _serial_putc(dev, *str++);
119 static int _serial_getc(struct udevice *dev)
121 struct dm_serial_ops *ops = serial_get_ops(dev);
125 err = ops->getc(dev);
128 } while (err == -EAGAIN);
130 return err >= 0 ? err : 0;
133 static int _serial_tstc(struct udevice *dev)
135 struct dm_serial_ops *ops = serial_get_ops(dev);
138 return ops->pending(dev, true);
143 void serial_putc(char ch)
145 if (gd->cur_serial_dev)
146 _serial_putc(gd->cur_serial_dev, ch);
149 void serial_puts(const char *str)
151 if (gd->cur_serial_dev)
152 _serial_puts(gd->cur_serial_dev, str);
155 int serial_getc(void)
157 if (!gd->cur_serial_dev)
160 return _serial_getc(gd->cur_serial_dev);
163 int serial_tstc(void)
165 if (!gd->cur_serial_dev)
168 return _serial_tstc(gd->cur_serial_dev);
171 void serial_setbrg(void)
173 struct dm_serial_ops *ops;
175 if (!gd->cur_serial_dev)
178 ops = serial_get_ops(gd->cur_serial_dev);
180 ops->setbrg(gd->cur_serial_dev, gd->baudrate);
183 void serial_stdio_init(void)
187 #ifdef CONFIG_DM_STDIO
188 static void serial_stub_putc(struct stdio_dev *sdev, const char ch)
190 _serial_putc(sdev->priv, ch);
194 void serial_stub_puts(struct stdio_dev *sdev, const char *str)
196 _serial_puts(sdev->priv, str);
199 int serial_stub_getc(struct stdio_dev *sdev)
201 return _serial_getc(sdev->priv);
204 int serial_stub_tstc(struct stdio_dev *sdev)
206 return _serial_tstc(sdev->priv);
210 * on_baudrate() - Update the actual baudrate when the env var changes
212 * This will check for a valid baudrate and only apply it if valid.
214 static int on_baudrate(const char *name, const char *value, enum env_op op,
222 case env_op_overwrite:
224 * Switch to new baudrate if new baudrate is supported
226 baudrate = simple_strtoul(value, NULL, 10);
228 /* Not actually changing */
229 if (gd->baudrate == baudrate)
232 for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) {
233 if (baudrate == baudrate_table[i])
236 if (i == ARRAY_SIZE(baudrate_table)) {
237 if ((flags & H_FORCE) == 0)
238 printf("## Baudrate %d bps not supported\n",
242 if ((flags & H_INTERACTIVE) != 0) {
243 printf("## Switch baudrate to %d bps and press ENTER ...\n",
248 gd->baudrate = baudrate;
254 if ((flags & H_INTERACTIVE) != 0)
262 printf("## Baudrate may not be deleted\n");
268 U_BOOT_ENV_CALLBACK(baudrate, on_baudrate);
270 static int serial_post_probe(struct udevice *dev)
272 struct dm_serial_ops *ops = serial_get_ops(dev);
273 #ifdef CONFIG_DM_STDIO
274 struct serial_dev_priv *upriv = dev_get_uclass_priv(dev);
275 struct stdio_dev sdev;
279 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
281 ops->setbrg += gd->reloc_off;
283 ops->getc += gd->reloc_off;
285 ops->putc += gd->reloc_off;
287 ops->pending += gd->reloc_off;
289 ops->clear += gd->reloc_off;
290 #if CONFIG_POST & CONFIG_SYS_POST_UART
292 ops->loop += gd->reloc_off
295 /* Set the baud rate */
297 ret = ops->setbrg(dev, gd->baudrate);
302 #ifdef CONFIG_DM_STDIO
303 if (!(gd->flags & GD_FLG_RELOC))
305 memset(&sdev, '\0', sizeof(sdev));
307 strncpy(sdev.name, dev->name, sizeof(sdev.name));
308 sdev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
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);
319 static int serial_pre_remove(struct udevice *dev)
321 #ifdef CONFIG_SYS_STDIO_DEREGISTER
322 struct serial_dev_priv *upriv = dev_get_uclass_priv(dev);
324 if (stdio_deregister_dev(upriv->sdev, 0))
331 UCLASS_DRIVER(serial) = {
334 .flags = DM_UC_FLAG_SEQ_ALIAS,
335 .post_probe = serial_post_probe,
336 .pre_remove = serial_pre_remove,
337 .per_device_auto_alloc_size = sizeof(struct serial_dev_priv),