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_PLATDATA
)) {
37 uclass_first_device(UCLASS_SERIAL
, &dev
);
39 gd
->cur_serial_dev
= dev
;
42 } else if (CONFIG_IS_ENABLED(OF_CONTROL
) && blob
) {
43 /* Check for a chosen console */
44 node
= fdtdec_get_chosen_node(blob
, "stdout-path");
46 const char *str
, *p
, *name
;
49 * Deal with things like
50 * stdout-path = "serial0:115200n8";
52 * We need to look up the alias and then follow it to
55 str
= fdtdec_get_chosen_prop(blob
, "stdout-path");
58 name
= fdt_get_alias_namelen(blob
, str
,
59 p
? p
- str
: strlen(str
));
61 node
= fdt_path_offset(blob
, name
);
65 node
= fdt_path_offset(blob
, "console");
66 if (!uclass_get_device_by_of_offset(UCLASS_SERIAL
, node
,
68 gd
->cur_serial_dev
= dev
;
73 * If the console is not marked to be bound before relocation,
77 !lists_bind_fdt(gd
->dm_root
, blob
, node
, &dev
)) {
78 if (!device_probe(dev
)) {
79 gd
->cur_serial_dev
= dev
;
84 if (!SPL_BUILD
|| !CONFIG_IS_ENABLED(OF_CONTROL
) || !blob
) {
86 * Try to use CONFIG_CONS_INDEX if available (it is numbered
89 * Failing that, get the device with sequence number 0, or in
90 * extremis just the first serial device we can find. But we
91 * insist on having a console (even if it is silent).
93 #ifdef CONFIG_CONS_INDEX
94 #define INDEX (CONFIG_CONS_INDEX - 1)
98 if (!uclass_get_device_by_seq(UCLASS_SERIAL
, INDEX
, &dev
) ||
99 !uclass_get_device(UCLASS_SERIAL
, INDEX
, &dev
) ||
100 (!uclass_first_device(UCLASS_SERIAL
, &dev
) && dev
)) {
101 gd
->cur_serial_dev
= dev
;
107 #ifdef CONFIG_REQUIRE_SERIAL_CONSOLE
108 panic_str("No serial driver found");
112 /* Called prior to relocation */
113 int serial_init(void)
115 serial_find_console_or_panic();
116 gd
->flags
|= GD_FLG_SERIAL_READY
;
121 /* Called after relocation */
122 void serial_initialize(void)
127 static void _serial_putc(struct udevice
*dev
, char ch
)
129 struct dm_serial_ops
*ops
= serial_get_ops(dev
);
133 _serial_putc(dev
, '\r');
136 err
= ops
->putc(dev
, ch
);
137 } while (err
== -EAGAIN
);
140 static void _serial_puts(struct udevice
*dev
, const char *str
)
143 _serial_putc(dev
, *str
++);
146 static int _serial_getc(struct udevice
*dev
)
148 struct dm_serial_ops
*ops
= serial_get_ops(dev
);
152 err
= ops
->getc(dev
);
155 } while (err
== -EAGAIN
);
157 return err
>= 0 ? err
: 0;
160 static int _serial_tstc(struct udevice
*dev
)
162 struct dm_serial_ops
*ops
= serial_get_ops(dev
);
165 return ops
->pending(dev
, true);
170 void serial_putc(char ch
)
172 if (gd
->cur_serial_dev
)
173 _serial_putc(gd
->cur_serial_dev
, ch
);
176 void serial_puts(const char *str
)
178 if (gd
->cur_serial_dev
)
179 _serial_puts(gd
->cur_serial_dev
, str
);
182 int serial_getc(void)
184 if (!gd
->cur_serial_dev
)
187 return _serial_getc(gd
->cur_serial_dev
);
190 int serial_tstc(void)
192 if (!gd
->cur_serial_dev
)
195 return _serial_tstc(gd
->cur_serial_dev
);
198 void serial_setbrg(void)
200 struct dm_serial_ops
*ops
;
202 if (!gd
->cur_serial_dev
)
205 ops
= serial_get_ops(gd
->cur_serial_dev
);
207 ops
->setbrg(gd
->cur_serial_dev
, gd
->baudrate
);
210 void serial_stdio_init(void)
214 #if defined(CONFIG_DM_STDIO) && CONFIG_IS_ENABLED(SERIAL_PRESENT)
215 static void serial_stub_putc(struct stdio_dev
*sdev
, const char ch
)
217 _serial_putc(sdev
->priv
, ch
);
221 void serial_stub_puts(struct stdio_dev
*sdev
, const char *str
)
223 _serial_puts(sdev
->priv
, str
);
226 int serial_stub_getc(struct stdio_dev
*sdev
)
228 return _serial_getc(sdev
->priv
);
231 int serial_stub_tstc(struct stdio_dev
*sdev
)
233 return _serial_tstc(sdev
->priv
);
237 * on_baudrate() - Update the actual baudrate when the env var changes
239 * This will check for a valid baudrate and only apply it if valid.
241 static int on_baudrate(const char *name
, const char *value
, enum env_op op
,
249 case env_op_overwrite
:
251 * Switch to new baudrate if new baudrate is supported
253 baudrate
= simple_strtoul(value
, NULL
, 10);
255 /* Not actually changing */
256 if (gd
->baudrate
== baudrate
)
259 for (i
= 0; i
< ARRAY_SIZE(baudrate_table
); ++i
) {
260 if (baudrate
== baudrate_table
[i
])
263 if (i
== ARRAY_SIZE(baudrate_table
)) {
264 if ((flags
& H_FORCE
) == 0)
265 printf("## Baudrate %d bps not supported\n",
269 if ((flags
& H_INTERACTIVE
) != 0) {
270 printf("## Switch baudrate to %d bps and press ENTER ...\n",
275 gd
->baudrate
= baudrate
;
281 if ((flags
& H_INTERACTIVE
) != 0)
289 printf("## Baudrate may not be deleted\n");
295 U_BOOT_ENV_CALLBACK(baudrate
, on_baudrate
);
297 #if CONFIG_IS_ENABLED(SERIAL_PRESENT)
298 static int serial_post_probe(struct udevice
*dev
)
300 struct dm_serial_ops
*ops
= serial_get_ops(dev
);
301 #ifdef CONFIG_DM_STDIO
302 struct serial_dev_priv
*upriv
= dev_get_uclass_priv(dev
);
303 struct stdio_dev sdev
;
307 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
309 ops
->setbrg
+= gd
->reloc_off
;
311 ops
->getc
+= gd
->reloc_off
;
313 ops
->putc
+= gd
->reloc_off
;
315 ops
->pending
+= gd
->reloc_off
;
317 ops
->clear
+= gd
->reloc_off
;
318 #if CONFIG_POST & CONFIG_SYS_POST_UART
320 ops
->loop
+= gd
->reloc_off
323 /* Set the baud rate */
325 ret
= ops
->setbrg(dev
, gd
->baudrate
);
330 #ifdef CONFIG_DM_STDIO
331 if (!(gd
->flags
& GD_FLG_RELOC
))
333 memset(&sdev
, '\0', sizeof(sdev
));
335 strncpy(sdev
.name
, dev
->name
, sizeof(sdev
.name
));
336 sdev
.flags
= DEV_FLAGS_OUTPUT
| DEV_FLAGS_INPUT
;
338 sdev
.putc
= serial_stub_putc
;
339 sdev
.puts
= serial_stub_puts
;
340 sdev
.getc
= serial_stub_getc
;
341 sdev
.tstc
= serial_stub_tstc
;
342 stdio_register_dev(&sdev
, &upriv
->sdev
);
347 static int serial_pre_remove(struct udevice
*dev
)
349 #ifdef CONFIG_SYS_STDIO_DEREGISTER
350 struct serial_dev_priv
*upriv
= dev_get_uclass_priv(dev
);
352 if (stdio_deregister_dev(upriv
->sdev
, 0))
359 UCLASS_DRIVER(serial
) = {
362 .flags
= DM_UC_FLAG_SEQ_ALIAS
,
363 .post_probe
= serial_post_probe
,
364 .pre_remove
= serial_pre_remove
,
365 .per_device_auto_alloc_size
= sizeof(struct serial_dev_priv
),