#include <common.h>
#include <dm.h>
+#include <environment.h>
#include <errno.h>
#include <fdtdec.h>
#include <os.h>
#include <serial.h>
#include <stdio_dev.h>
+#include <watchdog.h>
#include <dm/lists.h>
#include <dm/device-internal.h>
DECLARE_GLOBAL_DATA_PTR;
-/* The currently-selected console serial device */
-struct udevice *cur_dev __attribute__ ((section(".data")));
+/*
+ * Table with supported baudrates (defined in config_xyz.h)
+ */
+static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE;
#ifndef CONFIG_SYS_MALLOC_F_LEN
#error "Serial is required before relocation - define CONFIG_SYS_MALLOC_F_LEN to make this work"
static void serial_find_console_or_panic(void)
{
-#ifdef CONFIG_OF_CONTROL
+ struct udevice *dev;
int node;
- /* Check for a chosen console */
- node = fdtdec_get_chosen_node(gd->fdt_blob, "stdout-path");
- if (node < 0)
- node = fdtdec_get_alias_node(gd->fdt_blob, "console");
- if (!uclass_get_device_by_of_offset(UCLASS_SERIAL, node, &cur_dev))
- return;
-
- /*
- * If the console is not marked to be bound before relocation, bind
- * it anyway.
- */
- if (node > 0 &&
- !lists_bind_fdt(gd->dm_root, gd->fdt_blob, node, &cur_dev)) {
- if (!device_probe(cur_dev))
+ if (CONFIG_IS_ENABLED(OF_CONTROL) && gd->fdt_blob) {
+ /* Check for a chosen console */
+ node = fdtdec_get_chosen_node(gd->fdt_blob, "stdout-path");
+ if (node < 0)
+ node = fdt_path_offset(gd->fdt_blob, "console");
+ if (!uclass_get_device_by_of_offset(UCLASS_SERIAL, node,
+ &dev)) {
+ gd->cur_serial_dev = dev;
+ return;
+ }
+
+ /*
+ * If the console is not marked to be bound before relocation,
+ * bind it anyway.
+ */
+ if (node > 0 &&
+ !lists_bind_fdt(gd->dm_root, gd->fdt_blob, node, &dev)) {
+ if (!device_probe(dev)) {
+ gd->cur_serial_dev = dev;
+ return;
+ }
+ }
+ }
+ if (!SPL_BUILD || !CONFIG_IS_ENABLED(OF_CONTROL) || !gd->fdt_blob) {
+ /*
+ * Try to use CONFIG_CONS_INDEX if available (it is numbered
+ * from 1!).
+ *
+ * Failing that, get the device with sequence number 0, or in
+ * extremis just the first serial device we can find. But we
+ * insist on having a console (even if it is silent).
+ */
+#ifdef CONFIG_CONS_INDEX
+#define INDEX (CONFIG_CONS_INDEX - 1)
+#else
+#define INDEX 0
+#endif
+ if (!uclass_get_device_by_seq(UCLASS_SERIAL, INDEX, &dev) ||
+ !uclass_get_device(UCLASS_SERIAL, INDEX, &dev) ||
+ (!uclass_first_device(UCLASS_SERIAL, &dev) && dev)) {
+ gd->cur_serial_dev = dev;
return;
- cur_dev = NULL;
+ }
+#undef INDEX
}
+
+#ifdef CONFIG_REQUIRE_SERIAL_CONSOLE
+ panic_str("No serial driver found");
#endif
- /*
- * Failing that, get the device with sequence number 0, or in extremis
- * just the first serial device we can find. But we insist on having
- * a console (even if it is silent).
- */
- if (uclass_get_device_by_seq(UCLASS_SERIAL, 0, &cur_dev) &&
- (uclass_first_device(UCLASS_SERIAL, &cur_dev) || !cur_dev))
- panic("No serial driver found");
}
/* Called prior to relocation */
serial_find_console_or_panic();
}
-static void serial_putc_dev(struct udevice *dev, char ch)
+static void _serial_putc(struct udevice *dev, char ch)
{
- struct dm_serial_ops *ops = serial_get_ops(cur_dev);
+ struct dm_serial_ops *ops = serial_get_ops(dev);
int err;
do {
- err = ops->putc(cur_dev, ch);
+ err = ops->putc(dev, ch);
} while (err == -EAGAIN);
if (ch == '\n')
- serial_putc('\r');
+ _serial_putc(dev, '\r');
}
-void serial_putc(char ch)
+static void _serial_puts(struct udevice *dev, const char *str)
{
- serial_putc_dev(cur_dev, ch);
+ while (*str)
+ _serial_putc(dev, *str++);
}
-void serial_setbrg(void)
+static int _serial_getc(struct udevice *dev)
{
- struct dm_serial_ops *ops = serial_get_ops(cur_dev);
+ struct dm_serial_ops *ops = serial_get_ops(dev);
+ int err;
- if (ops->setbrg)
- ops->setbrg(cur_dev, gd->baudrate);
-}
+ do {
+ err = ops->getc(dev);
+ if (err == -EAGAIN)
+ WATCHDOG_RESET();
+ } while (err == -EAGAIN);
-void serial_puts(const char *str)
-{
- while (*str)
- serial_putc(*str++);
+ return err >= 0 ? err : 0;
}
-int serial_tstc(void)
+static int _serial_tstc(struct udevice *dev)
{
- struct dm_serial_ops *ops = serial_get_ops(cur_dev);
+ struct dm_serial_ops *ops = serial_get_ops(dev);
if (ops->pending)
- return ops->pending(cur_dev, true);
+ return ops->pending(dev, true);
return 1;
}
-static int serial_getc_dev(struct udevice *dev)
+void serial_putc(char ch)
{
- struct dm_serial_ops *ops = serial_get_ops(dev);
- int err;
-
- do {
- err = ops->getc(dev);
- } while (err == -EAGAIN);
+ if (gd->cur_serial_dev)
+ _serial_putc(gd->cur_serial_dev, ch);
+}
- return err >= 0 ? err : 0;
+void serial_puts(const char *str)
+{
+ if (gd->cur_serial_dev)
+ _serial_puts(gd->cur_serial_dev, str);
}
int serial_getc(void)
{
- return serial_getc_dev(cur_dev);
+ if (!gd->cur_serial_dev)
+ return 0;
+
+ return _serial_getc(gd->cur_serial_dev);
+}
+
+int serial_tstc(void)
+{
+ if (!gd->cur_serial_dev)
+ return 0;
+
+ return _serial_tstc(gd->cur_serial_dev);
+}
+
+void serial_setbrg(void)
+{
+ struct dm_serial_ops *ops;
+
+ if (!gd->cur_serial_dev)
+ return;
+
+ ops = serial_get_ops(gd->cur_serial_dev);
+ if (ops->setbrg)
+ ops->setbrg(gd->cur_serial_dev, gd->baudrate);
}
void serial_stdio_init(void)
{
}
+#ifdef CONFIG_DM_STDIO
static void serial_stub_putc(struct stdio_dev *sdev, const char ch)
{
- struct udevice *dev = sdev->priv;
-
- serial_putc_dev(dev, ch);
+ _serial_putc(sdev->priv, ch);
}
+#endif
void serial_stub_puts(struct stdio_dev *sdev, const char *str)
{
- while (*str)
- serial_stub_putc(sdev, *str++);
+ _serial_puts(sdev->priv, str);
}
int serial_stub_getc(struct stdio_dev *sdev)
{
- struct udevice *dev = sdev->priv;
-
- return serial_getc_dev(dev);
+ return _serial_getc(sdev->priv);
}
int serial_stub_tstc(struct stdio_dev *sdev)
{
- struct udevice *dev = sdev->priv;
- struct dm_serial_ops *ops = serial_get_ops(dev);
+ return _serial_tstc(sdev->priv);
+}
- if (ops->pending)
- return ops->pending(dev, true);
+/**
+ * on_baudrate() - Update the actual baudrate when the env var changes
+ *
+ * This will check for a valid baudrate and only apply it if valid.
+ */
+static int on_baudrate(const char *name, const char *value, enum env_op op,
+ int flags)
+{
+ int i;
+ int baudrate;
+
+ switch (op) {
+ case env_op_create:
+ case env_op_overwrite:
+ /*
+ * Switch to new baudrate if new baudrate is supported
+ */
+ baudrate = simple_strtoul(value, NULL, 10);
+
+ /* Not actually changing */
+ if (gd->baudrate == baudrate)
+ return 0;
+
+ for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) {
+ if (baudrate == baudrate_table[i])
+ break;
+ }
+ if (i == ARRAY_SIZE(baudrate_table)) {
+ if ((flags & H_FORCE) == 0)
+ printf("## Baudrate %d bps not supported\n",
+ baudrate);
+ return 1;
+ }
+ if ((flags & H_INTERACTIVE) != 0) {
+ printf("## Switch baudrate to %d bps and press ENTER ...\n",
+ baudrate);
+ udelay(50000);
+ }
+
+ gd->baudrate = baudrate;
+
+ serial_setbrg();
+
+ udelay(50000);
+
+ if ((flags & H_INTERACTIVE) != 0)
+ while (1) {
+ if (getc() == '\r')
+ break;
+ }
- return 1;
+ return 0;
+ case env_op_delete:
+ printf("## Baudrate may not be deleted\n");
+ return 1;
+ default:
+ return 0;
+ }
}
+U_BOOT_ENV_CALLBACK(baudrate, on_baudrate);
static int serial_post_probe(struct udevice *dev)
{
- struct stdio_dev sdev;
struct dm_serial_ops *ops = serial_get_ops(dev);
- struct serial_dev_priv *upriv = dev->uclass_priv;
+#ifdef CONFIG_DM_STDIO
+ struct serial_dev_priv *upriv = dev_get_uclass_priv(dev);
+ struct stdio_dev sdev;
+#endif
int ret;
+#if defined(CONFIG_NEEDS_MANUAL_RELOC)
+ if (ops->setbrg)
+ ops->setbrg += gd->reloc_off;
+ if (ops->getc)
+ ops->getc += gd->reloc_off;
+ if (ops->putc)
+ ops->putc += gd->reloc_off;
+ if (ops->pending)
+ ops->pending += gd->reloc_off;
+ if (ops->clear)
+ ops->clear += gd->reloc_off;
+#if CONFIG_POST & CONFIG_SYS_POST_UART
+ if (ops->loop)
+ ops->loop += gd->reloc_off
+#endif
+#endif
/* Set the baud rate */
if (ops->setbrg) {
ret = ops->setbrg(dev, gd->baudrate);
return ret;
}
+#ifdef CONFIG_DM_STDIO
if (!(gd->flags & GD_FLG_RELOC))
return 0;
-
memset(&sdev, '\0', sizeof(sdev));
strncpy(sdev.name, dev->name, sizeof(sdev.name));
sdev.getc = serial_stub_getc;
sdev.tstc = serial_stub_tstc;
stdio_register_dev(&sdev, &upriv->sdev);
-
+#endif
return 0;
}
static int serial_pre_remove(struct udevice *dev)
{
#ifdef CONFIG_SYS_STDIO_DEREGISTER
- struct serial_dev_priv *upriv = dev->uclass_priv;
+ struct serial_dev_priv *upriv = dev_get_uclass_priv(dev);
if (stdio_deregister_dev(upriv->sdev, 0))
return -EPERM;
UCLASS_DRIVER(serial) = {
.id = UCLASS_SERIAL,
.name = "serial",
+ .flags = DM_UC_FLAG_SEQ_ALIAS,
.post_probe = serial_post_probe,
.pre_remove = serial_pre_remove,
.per_device_auto_alloc_size = sizeof(struct serial_dev_priv),
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