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lib: utils: identify supported GPIO reset methods

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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>
This commit is contained in:
Heinrich Schuchardt 2021-09-28 13:42:46 +02:00 • committed by Anup Patel
parent fa59dd317a
commit 754d51192b
1 changed files with 21 additions and 23 deletions
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44
lib/utils/reset/fdt_reset_gpio.c
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@ -35,21 +35,9 @@ static struct gpio_reset restart = {
.inactive_delay = 100 .inactive_delay = 100
}; };
static int gpio_system_reset_check(u32 type, u32 reason) static struct gpio_reset *gpio_get_reset_settings(u32 type)
{ {
switch (type) { struct gpio_reset *reset;
case SBI_SRST_RESET_TYPE_SHUTDOWN:
case SBI_SRST_RESET_TYPE_COLD_REBOOT:
case SBI_SRST_RESET_TYPE_WARM_REBOOT:
return 1;
}
return 0;
}
static void gpio_system_reset(u32 type, u32 reason)
{
struct gpio_reset *reset = NULL;
switch (type) { switch (type) {
case SBI_SRST_RESET_TYPE_SHUTDOWN: case SBI_SRST_RESET_TYPE_SHUTDOWN:
@ -59,14 +47,26 @@ static void gpio_system_reset(u32 type, u32 reason)
case SBI_SRST_RESET_TYPE_WARM_REBOOT: case SBI_SRST_RESET_TYPE_WARM_REBOOT:
reset = &restart; reset = &restart;
break; break;
default:
reset = NULL;
} }
if (reset) { if (reset && !reset->pin.chip)
if (!reset->pin.chip) { reset = NULL;
sbi_printf("%s: gpio pin not available\n", __func__);
goto skip_reset;
}
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 */ /* drive it active, also inactive->active edge */
gpio_direction_output(&reset->pin, 1); gpio_direction_output(&reset->pin, 1);
sbi_timer_mdelay(reset->active_delay); sbi_timer_mdelay(reset->active_delay);
@ -77,11 +77,9 @@ static void gpio_system_reset(u32 type, u32 reason)
/* drive it active, also inactive->active edge */ /* drive it active, also inactive->active edge */
gpio_set(&reset->pin, 1); gpio_set(&reset->pin, 1);
skip_reset:
/* hang !!! */
sbi_hart_hang();
} }
/* hang !!! */
sbi_hart_hang();
} }
static struct sbi_system_reset_device gpio_reset = { static struct sbi_system_reset_device gpio_reset = {