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/*
* Copyright (c) 2014 The Chromium OS Authors.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.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>
#include <ns16550.h>
DECLARE_GLOBAL_DATA_PTR;
/* The currently-selected console serial device */
struct udevice *cur_dev __attribute__ ((section(".data")));
#ifndef CONFIG_SYS_MALLOC_F_LEN
#error "Serial is required before relocation - define CONFIG_SYS_MALLOC_F_LEN to make this work"
#endif
static void serial_find_console_or_panic(void)
{
#ifdef CONFIG_OF_CONTROL
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))
return;
cur_dev = NULL;
}
#endif
/*
* 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, &cur_dev) &&
uclass_get_device(UCLASS_SERIAL, INDEX, &cur_dev) &&
(uclass_first_device(UCLASS_SERIAL, &cur_dev) || !cur_dev))
panic("No serial driver found");
#undef INDEX
}
/* Called prior to relocation */
int serial_init(void)
{
serial_find_console_or_panic();
gd->flags |= GD_FLG_SERIAL_READY;
return 0;
}
/* Called after relocation */
void serial_initialize(void)
{
serial_find_console_or_panic();
}
static void serial_putc_dev(struct udevice *dev, char ch)
{
struct dm_serial_ops *ops = serial_get_ops(dev);
int err;
do {
err = ops->putc(dev, ch);
} while (err == -EAGAIN);
if (ch == '\n')
serial_putc_dev(dev, '\r');
}
void serial_putc(char ch)
{
serial_putc_dev(cur_dev, ch);
}
void serial_setbrg(void)
{
struct dm_serial_ops *ops = serial_get_ops(cur_dev);
if (ops->setbrg)
ops->setbrg(cur_dev, gd->baudrate);
}
void serial_puts(const char *str)
{
while (*str)
serial_putc(*str++);
}
int serial_tstc(void)
{
struct dm_serial_ops *ops = serial_get_ops(cur_dev);
if (ops->pending)
return ops->pending(cur_dev, true);
return 1;
}
static int serial_getc_dev(struct udevice *dev)
{
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_getc(void)
{
return serial_getc_dev(cur_dev);
}
void serial_stdio_init(void)
{
}
static void serial_stub_putc(struct stdio_dev *sdev, const char ch)
{
serial_putc_dev(sdev->priv, ch);
}
void serial_stub_puts(struct stdio_dev *sdev, const char *str)
{
while (*str)
serial_stub_putc(sdev, *str++);
}
int serial_stub_getc(struct stdio_dev *sdev)
{
return serial_getc_dev(sdev->priv);
}
int serial_stub_tstc(struct stdio_dev *sdev)
{
struct udevice *dev = sdev->priv;
struct dm_serial_ops *ops = serial_get_ops(dev);
if (ops->pending)
return ops->pending(dev, true);
return 1;
}
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;
int ret;
/* Set the baud rate */
if (ops->setbrg) {
ret = ops->setbrg(dev, gd->baudrate);
if (ret)
return ret;
}
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.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);
return 0;
}
static int serial_pre_remove(struct udevice *dev)
{
#ifdef CONFIG_SYS_STDIO_DEREGISTER
struct serial_dev_priv *upriv = dev->uclass_priv;
if (stdio_deregister_dev(upriv->sdev, 0))
return -EPERM;
#endif
return 0;
}
UCLASS_DRIVER(serial) = {
.id = UCLASS_SERIAL,
.name = "serial",
.post_probe = serial_post_probe,
.pre_remove = serial_pre_remove,
.per_device_auto_alloc_size = sizeof(struct serial_dev_priv),
};
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