mirror of
https://github.com/Fishwaldo/opensbi.git
synced 2025-03-27 17:21:37 +00:00
754d51192b
The GPIO reset driver supports reset and poweroff. But not all boards support both. gpio_system_reset_check() must detect this situation. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
/*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2021 SiFive
|
|
* Copyright (c) 2021 Western Digital Corporation or its affiliates.
|
|
*
|
|
* Authors:
|
|
* Green Wan <green.wan@sifive.com>
|
|
* Anup Patel <anup.patel@wdc.com>
|
|
*/
|
|
|
|
#include <libfdt.h>
|
|
#include <sbi/sbi_console.h>
|
|
#include <sbi/sbi_ecall_interface.h>
|
|
#include <sbi/sbi_hart.h>
|
|
#include <sbi/sbi_system.h>
|
|
#include <sbi/sbi_timer.h>
|
|
#include <sbi_utils/fdt/fdt_helper.h>
|
|
#include <sbi_utils/gpio/fdt_gpio.h>
|
|
#include <sbi_utils/reset/fdt_reset.h>
|
|
|
|
struct gpio_reset {
|
|
struct gpio_pin pin;
|
|
u32 active_delay;
|
|
u32 inactive_delay;
|
|
};
|
|
|
|
static struct gpio_reset poweroff = {
|
|
.active_delay = 100,
|
|
.inactive_delay = 100
|
|
};
|
|
|
|
static struct gpio_reset restart = {
|
|
.active_delay = 100,
|
|
.inactive_delay = 100
|
|
};
|
|
|
|
static struct gpio_reset *gpio_get_reset_settings(u32 type)
|
|
{
|
|
struct gpio_reset *reset;
|
|
|
|
switch (type) {
|
|
case SBI_SRST_RESET_TYPE_SHUTDOWN:
|
|
reset = &poweroff;
|
|
break;
|
|
case SBI_SRST_RESET_TYPE_COLD_REBOOT:
|
|
case SBI_SRST_RESET_TYPE_WARM_REBOOT:
|
|
reset = &restart;
|
|
break;
|
|
default:
|
|
reset = NULL;
|
|
}
|
|
|
|
if (reset && !reset->pin.chip)
|
|
reset = NULL;
|
|
|
|
return reset;
|
|
}
|
|
|
|
static int gpio_system_reset_check(u32 type, u32 reason)
|
|
{
|
|
return !!gpio_get_reset_settings(type);
|
|
}
|
|
|
|
static void gpio_system_reset(u32 type, u32 reason)
|
|
{
|
|
struct gpio_reset *reset = gpio_get_reset_settings(type);
|
|
|
|
if (reset) {
|
|
/* drive it active, also inactive->active edge */
|
|
gpio_direction_output(&reset->pin, 1);
|
|
sbi_timer_mdelay(reset->active_delay);
|
|
|
|
/* drive inactive, also active->inactive edge */
|
|
gpio_set(&reset->pin, 0);
|
|
sbi_timer_mdelay(reset->inactive_delay);
|
|
|
|
/* drive it active, also inactive->active edge */
|
|
gpio_set(&reset->pin, 1);
|
|
}
|
|
/* hang !!! */
|
|
sbi_hart_hang();
|
|
}
|
|
|
|
static struct sbi_system_reset_device gpio_reset = {
|
|
.name = "gpio-reset",
|
|
.system_reset_check = gpio_system_reset_check,
|
|
.system_reset = gpio_system_reset
|
|
};
|
|
|
|
static int gpio_reset_init(void *fdt, int nodeoff,
|
|
const struct fdt_match *match)
|
|
{
|
|
int rc, len;
|
|
const fdt32_t *val;
|
|
bool is_restart = (ulong)match->data;
|
|
const char *dir_prop = (is_restart) ? "open-source" : "input";
|
|
struct gpio_reset *reset = (is_restart) ? &restart : &poweroff;
|
|
|
|
rc = fdt_gpio_pin_get(fdt, nodeoff, 0, &reset->pin);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (fdt_getprop(fdt, nodeoff, dir_prop, &len)) {
|
|
rc = gpio_direction_input(&reset->pin);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
val = fdt_getprop(fdt, nodeoff, "active-delay-ms", &len);
|
|
if (len > 0)
|
|
reset->active_delay = fdt32_to_cpu(*val);
|
|
|
|
val = fdt_getprop(fdt, nodeoff, "inactive-delay-ms", &len);
|
|
if (len > 0)
|
|
reset->inactive_delay = fdt32_to_cpu(*val);
|
|
|
|
sbi_system_reset_set_device(&gpio_reset);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct fdt_match gpio_poweroff_match[] = {
|
|
{ .compatible = "gpio-poweroff", .data = (void *)FALSE },
|
|
{ },
|
|
};
|
|
|
|
struct fdt_reset fdt_poweroff_gpio = {
|
|
.match_table = gpio_poweroff_match,
|
|
.init = gpio_reset_init,
|
|
};
|
|
|
|
static const struct fdt_match gpio_reset_match[] = {
|
|
{ .compatible = "gpio-restart", .data = (void *)TRUE },
|
|
{ },
|
|
};
|
|
|
|
struct fdt_reset fdt_reset_gpio = {
|
|
.match_table = gpio_reset_match,
|
|
.init = gpio_reset_init,
|
|
};
|