+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2014 The Chromium OS Authors.
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
+#include <env_internal.h>
#include <errno.h>
-#include <fdtdec.h>
+#include <malloc.h>
#include <os.h>
#include <serial.h>
#include <stdio_dev.h>
+#include <watchdog.h>
#include <dm/lists.h>
#include <dm/device-internal.h>
+#include <dm/of_access.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"
+#if !CONFIG_VAL(SYS_MALLOC_F_LEN)
+#error "Serial is required before relocation - define CONFIG_$(SPL_)SYS_MALLOC_F_LEN to make this work"
#endif
-static void serial_find_console_or_panic(void)
+#if CONFIG_IS_ENABLED(SERIAL_PRESENT)
+static int serial_check_stdout(const void *blob, struct udevice **devp)
{
-#ifdef CONFIG_OF_CONTROL
- int node;
+ int node = -1;
+ const char *str, *p, *name;
+ int namelen;
/* Check for a chosen console */
- node = fdtdec_get_chosen_node(gd->fdt_blob, "stdout-path");
+ str = fdtdec_get_chosen_prop(blob, "stdout-path");
+ if (str) {
+ p = strchr(str, ':');
+ namelen = p ? p - str : strlen(str);
+ node = fdt_path_offset_namelen(blob, str, namelen);
+
+ if (node < 0) {
+ /*
+ * Deal with things like
+ * stdout-path = "serial0:115200n8";
+ *
+ * We need to look up the alias and then follow it to
+ * the correct node.
+ */
+ name = fdt_get_alias_namelen(blob, str, namelen);
+ if (name)
+ node = fdt_path_offset(blob, name);
+ }
+ }
+
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;
+ node = fdt_path_offset(blob, "console");
+ if (!uclass_get_device_by_of_offset(UCLASS_SERIAL, node, devp))
+ return 0;
/*
- * If the console is not marked to be bound before relocation, bind
- * it anyway.
+ * 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 (node > 0 && !lists_bind_fdt(gd->dm_root, offset_to_ofnode(node),
+ devp, false)) {
+ if (!device_probe(*devp))
+ return 0;
+ }
+
+ return -ENODEV;
+}
+
+static void serial_find_console_or_panic(void)
+{
+ const void *blob = gd->fdt_blob;
+ struct udevice *dev;
+#ifdef CONFIG_SERIAL_SEARCH_ALL
+ int ret;
+#endif
+
+ if (CONFIG_IS_ENABLED(OF_PLATDATA)) {
+ uclass_first_device(UCLASS_SERIAL, &dev);
+ if (dev) {
+ gd->cur_serial_dev = dev;
return;
- cur_dev = NULL;
+ }
+ } else if (CONFIG_IS_ENABLED(OF_CONTROL) && blob) {
+ /* Live tree has support for stdout */
+ if (of_live_active()) {
+ struct device_node *np = of_get_stdout();
+
+ if (np && !uclass_get_device_by_ofnode(UCLASS_SERIAL,
+ np_to_ofnode(np), &dev)) {
+ gd->cur_serial_dev = dev;
+ return;
+ }
+ } else {
+ if (!serial_check_stdout(blob, &dev)) {
+ gd->cur_serial_dev = dev;
+ return;
+ }
+ }
}
+ if (!SPL_BUILD || !CONFIG_IS_ENABLED(OF_CONTROL) || !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 working 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
+
+#ifdef CONFIG_SERIAL_SEARCH_ALL
+ if (!uclass_get_device_by_seq(UCLASS_SERIAL, INDEX, &dev) ||
+ !uclass_get_device(UCLASS_SERIAL, INDEX, &dev)) {
+ if (dev->flags & DM_FLAG_ACTIVATED) {
+ gd->cur_serial_dev = dev;
+ return;
+ }
+ }
+
+ /* Search for any working device */
+ for (ret = uclass_first_device_check(UCLASS_SERIAL, &dev);
+ dev;
+ ret = uclass_next_device_check(&dev)) {
+ if (!ret) {
+ /* Device did succeed probing */
+ gd->cur_serial_dev = dev;
+ return;
+ }
+ }
+#else
+ 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;
+ }
+#endif
+
+#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");
}
+#endif /* CONFIG_SERIAL_PRESENT */
/* Called prior to relocation */
int serial_init(void)
{
+#if CONFIG_IS_ENABLED(SERIAL_PRESENT)
serial_find_console_or_panic();
gd->flags |= GD_FLG_SERIAL_READY;
+ serial_setbrg();
+#endif
return 0;
}
/* Called after relocation */
void serial_initialize(void)
{
- serial_find_console_or_panic();
+ serial_init();
}
-void serial_putc(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;
+ if (ch == '\n')
+ _serial_putc(dev, '\r');
+
do {
- err = ops->putc(cur_dev, ch);
+ err = ops->putc(dev, ch);
} while (err == -EAGAIN);
- if (ch == '\n')
- serial_putc('\r');
}
-void serial_setbrg(void)
+static void _serial_puts(struct udevice *dev, const char *str)
{
- struct dm_serial_ops *ops = serial_get_ops(cur_dev);
-
- if (ops->setbrg)
- ops->setbrg(cur_dev, gd->baudrate);
+ while (*str)
+ _serial_putc(dev, *str++);
}
-void serial_puts(const char *str)
+static int __serial_getc(struct udevice *dev)
{
- while (*str)
- serial_putc(*str++);
+ struct dm_serial_ops *ops = serial_get_ops(dev);
+ int err;
+
+ do {
+ err = ops->getc(dev);
+ if (err == -EAGAIN)
+ WATCHDOG_RESET();
+ } while (err == -EAGAIN);
+
+ 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;
}
+#if CONFIG_IS_ENABLED(SERIAL_RX_BUFFER)
+static int _serial_tstc(struct udevice *dev)
+{
+ struct serial_dev_priv *upriv = dev_get_uclass_priv(dev);
+
+ /* Read all available chars into the RX buffer */
+ while (__serial_tstc(dev)) {
+ upriv->buf[upriv->wr_ptr++] = __serial_getc(dev);
+ upriv->wr_ptr %= CONFIG_SERIAL_RX_BUFFER_SIZE;
+ }
+
+ return upriv->rd_ptr != upriv->wr_ptr ? 1 : 0;
+}
+
+static int _serial_getc(struct udevice *dev)
+{
+ struct serial_dev_priv *upriv = dev_get_uclass_priv(dev);
+ char val;
+
+ if (upriv->rd_ptr == upriv->wr_ptr)
+ return __serial_getc(dev);
+
+ val = upriv->buf[upriv->rd_ptr++];
+ upriv->rd_ptr %= CONFIG_SERIAL_RX_BUFFER_SIZE;
+
+ return val;
+}
+
+#else /* CONFIG_IS_ENABLED(SERIAL_RX_BUFFER) */
+
+static int _serial_getc(struct udevice *dev)
+{
+ return __serial_getc(dev);
+}
+
+static int _serial_tstc(struct udevice *dev)
+{
+ return __serial_tstc(dev);
+}
+#endif /* CONFIG_IS_ENABLED(SERIAL_RX_BUFFER) */
+
+void serial_putc(char ch)
+{
+ if (gd->cur_serial_dev)
+ _serial_putc(gd->cur_serial_dev, ch);
+}
+
+void serial_puts(const char *str)
+{
+ if (gd->cur_serial_dev)
+ _serial_puts(gd->cur_serial_dev, str);
+}
+
int serial_getc(void)
{
- struct dm_serial_ops *ops = serial_get_ops(cur_dev);
- int err;
+ if (!gd->cur_serial_dev)
+ return 0;
- do {
- err = ops->getc(cur_dev);
- } while (err == -EAGAIN);
+ return _serial_getc(gd->cur_serial_dev);
+}
- return err >= 0 ? err : 0;
+int serial_tstc(void)
+{
+ if (!gd->cur_serial_dev)
+ return 0;
+
+ return _serial_tstc(gd->cur_serial_dev);
}
-void serial_stdio_init(void)
+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_stub_putc(struct stdio_dev *sdev, const char ch)
+int serial_getconfig(struct udevice *dev, uint *config)
{
- struct udevice *dev = sdev->priv;
- struct dm_serial_ops *ops = serial_get_ops(dev);
+ struct dm_serial_ops *ops;
+
+ ops = serial_get_ops(dev);
+ if (ops->getconfig)
+ return ops->getconfig(dev, config);
- ops->putc(dev, ch);
+ return 0;
}
-void serial_stub_puts(struct stdio_dev *sdev, const char *str)
+int serial_setconfig(struct udevice *dev, uint config)
{
- while (*str)
- serial_stub_putc(sdev, *str++);
+ struct dm_serial_ops *ops;
+
+ ops = serial_get_ops(dev);
+ if (ops->setconfig)
+ return ops->setconfig(dev, config);
+
+ return 0;
}
-int serial_stub_getc(struct stdio_dev *sdev)
+int serial_getinfo(struct udevice *dev, struct serial_device_info *info)
{
- struct udevice *dev = sdev->priv;
- struct dm_serial_ops *ops = serial_get_ops(dev);
+ struct dm_serial_ops *ops;
- int err;
+ if (!info)
+ return -EINVAL;
- do {
- err = ops->getc(dev);
- } while (err == -EAGAIN);
+ info->baudrate = gd->baudrate;
- return err >= 0 ? err : 0;
+ ops = serial_get_ops(dev);
+ if (ops->getinfo)
+ return ops->getinfo(dev, info);
+
+ return -EINVAL;
}
-int serial_stub_tstc(struct stdio_dev *sdev)
+void serial_stdio_init(void)
{
- struct udevice *dev = sdev->priv;
- struct dm_serial_ops *ops = serial_get_ops(dev);
+}
- if (ops->pending)
- return ops->pending(dev, true);
+#if defined(CONFIG_DM_STDIO)
- return 1;
+#if CONFIG_IS_ENABLED(SERIAL_PRESENT)
+static void serial_stub_putc(struct stdio_dev *sdev, const char ch)
+{
+ _serial_putc(sdev->priv, ch);
+}
+#endif
+
+static void serial_stub_puts(struct stdio_dev *sdev, const char *str)
+{
+ _serial_puts(sdev->priv, str);
+}
+
+static int serial_stub_getc(struct stdio_dev *sdev)
+{
+ return _serial_getc(sdev->priv);
}
+static int serial_stub_tstc(struct stdio_dev *sdev)
+{
+ return _serial_tstc(sdev->priv);
+}
+#endif
+
+/**
+ * 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 0;
+ case env_op_delete:
+ printf("## Baudrate may not be deleted\n");
+ return 1;
+ default:
+ return 0;
+ }
+}
+U_BOOT_ENV_CALLBACK(baudrate, on_baudrate);
+
+#if CONFIG_IS_ENABLED(SERIAL_PRESENT)
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 (ops->getconfig)
+ ops->getconfig += gd->reloc_off;
+ if (ops->setconfig)
+ ops->setconfig += gd->reloc_off;
+#if CONFIG_POST & CONFIG_SYS_POST_UART
+ if (ops->loop)
+ ops->loop += gd->reloc_off;
+#endif
+ if (ops->getinfo)
+ ops->getinfo += gd->reloc_off;
+#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.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
+ sdev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_DM;
sdev.priv = dev;
sdev.putc = serial_stub_putc;
sdev.puts = serial_stub_puts;
sdev.getc = serial_stub_getc;
sdev.tstc = serial_stub_tstc;
- stdio_register_dev(&sdev, &upriv->sdev);
+#if CONFIG_IS_ENABLED(SERIAL_RX_BUFFER)
+ /* Allocate the RX buffer */
+ upriv->buf = malloc(CONFIG_SERIAL_RX_BUFFER_SIZE);
+#endif
+
+ 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;
+#if CONFIG_IS_ENABLED(SYS_STDIO_DEREGISTER)
+ struct serial_dev_priv *upriv = dev_get_uclass_priv(dev);
- if (stdio_deregister_dev(upriv->sdev, 0))
+ if (stdio_deregister_dev(upriv->sdev, true))
return -EPERM;
#endif
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),
};
+#endif