diff options
| author | Heinrich Schuchardt <heinrich.schuchardt@canonical.com> | 2021-09-28 14:42:46 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2021-10-01 07:54:43 +0300 |
| commit | 754d51192b6bf6a4afd9d46c5f736a9f6dd1b404 (patch) | |
| tree | 4fa636116858ce08252f70b388eb12d2f06bd886 /lib/utils/reset/fdt_reset_gpio.c | |
| parent | fa59dd317aaf9c05c6d89a40c27bd98316d8c2df (diff) | |
| download | opensbi-754d51192b6bf6a4afd9d46c5f736a9f6dd1b404.tar.xz | |
lib: utils: identify supported GPIO reset methods
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>
Diffstat (limited to 'lib/utils/reset/fdt_reset_gpio.c')
| -rw-r--r-- | lib/utils/reset/fdt_reset_gpio.c | 44 |
1 files changed, 21 insertions, 23 deletions
diff --git a/lib/utils/reset/fdt_reset_gpio.c b/lib/utils/reset/fdt_reset_gpio.c index 30127f5..77e4d0e 100644 --- a/lib/utils/reset/fdt_reset_gpio.c +++ b/lib/utils/reset/fdt_reset_gpio.c @@ -35,21 +35,9 @@ static struct gpio_reset restart = { .inactive_delay = 100 }; -static int gpio_system_reset_check(u32 type, u32 reason) -{ - switch (type) { - 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) +static struct gpio_reset *gpio_get_reset_settings(u32 type) { - struct gpio_reset *reset = NULL; + struct gpio_reset *reset; switch (type) { 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: reset = &restart; break; + default: + reset = NULL; } - if (reset) { - if (!reset->pin.chip) { - sbi_printf("%s: gpio pin not available\n", __func__); - goto skip_reset; - } + 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); @@ -77,11 +77,9 @@ static void gpio_system_reset(u32 type, u32 reason) /* drive it active, also inactive->active edge */ gpio_set(&reset->pin, 1); - -skip_reset: - /* hang !!! */ - sbi_hart_hang(); } + /* hang !!! */ + sbi_hart_hang(); } static struct sbi_system_reset_device gpio_reset = { |