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drivers: hwinfo: Added reset cause support for RPi Pico

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Added support for hwinfo's reset cause functions, for the Raspberry Pi
Pico series.

Signed-off-by: Yonatan Schachter <yonatan.schachter@gmail.com>
This commit is contained in:
Yonatan Schachter 2022-02-07 22:35:30 +02:00 • committed by Carles Cufí
commit 72c61f1005
1 changed files with 40 additions and 0 deletions
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40
drivers/hwinfo/hwinfo_rpi_pico.c
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@ -7,9 +7,14 @@
#include <string.h>
#include <drivers/hwinfo.h>
#include <hardware/flash.h>
#include <hardware/structs/vreg_and_chip_reset.h>
#define FLASH_RUID_DATA_BYTES 8
#define HAD_RUN_BIT BIT(VREG_AND_CHIP_RESET_CHIP_RESET_HAD_RUN_LSB)
#define HAD_PSM_RESTART_BIT BIT(VREG_AND_CHIP_RESET_CHIP_RESET_HAD_PSM_RESTART_LSB)
#define HAD_POR_BIT BIT(VREG_AND_CHIP_RESET_CHIP_RESET_HAD_POR_LSB)
ssize_t z_impl_hwinfo_get_device_id(uint8_t *buffer, size_t length)
{
uint8_t id[FLASH_RUID_DATA_BYTES];
@ -32,3 +37,38 @@ ssize_t z_impl_hwinfo_get_device_id(uint8_t *buffer, size_t length)
return length;
}
int z_impl_hwinfo_get_reset_cause(uint32_t *cause)
{
uint32_t flags = 0;
uint32_t reset_register = vreg_and_chip_reset_hw->chip_reset;
if (reset_register & HAD_POR_BIT) {
flags |= RESET_POR;
}
if (reset_register & HAD_RUN_BIT) {
flags |= RESET_PIN;
}
if (reset_register & HAD_PSM_RESTART_BIT) {
flags |= RESET_DEBUG;
}
*cause = flags;
return 0;
}
int z_impl_hwinfo_clear_reset_cause(void)
{
/* The reset register can't be modified, nothing to do. */
return -ENOSYS;
}
int z_impl_hwinfo_get_supported_reset_cause(uint32_t *supported)
{
*supported = RESET_PIN | RESET_DEBUG | RESET_POR;
return 0;
}