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armcm_reset: support canboot detection 

When CanBoot is detected set its bypass signature when a
reset is requested.

Add a "try_request_canboot()" method that may be called
from from USB and Canbus bootloader requests.

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>
This commit is contained in:
Eric Callahan 2022-05-31 06:51:25 -04:00 committed by KevinOConnor
parent 04eb72dcd5
commit 8b1e3c3fb2
1 changed files with 32 additions and 0 deletions
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32
src/generic/armcm_reset.c
View File

@ -6,10 +6,42 @@
#include "board/internal.h" // NVIC_SystemReset
#include "command.h" // DECL_COMMAND_FLAGS
#include "autoconf.h" // CONFIG_FLASH_START
#include "irq.h" // irq_disable
#define CANBOOT_SIGNATURE 0x21746f6f426e6143
#define CANBOOT_REQUEST 0x5984E3FA6CA1589B
#define CANBOOT_BYPASS 0x7b06ec45a9a8243d
static void
canboot_reset(uint64_t req_signature)
{
if (!(CONFIG_FLASH_START & 0x00FFFFFF))
// No bootloader
return;
uint32_t *bl_vectors = (uint32_t *)(CONFIG_FLASH_START & 0xFF000000);
uint64_t *boot_sig = (uint64_t *)(bl_vectors[1] - 9);
uint64_t *req_sig = (uint64_t *)bl_vectors[0];
if (boot_sig == (void *)ALIGN((size_t)boot_sig, 8) &&
*boot_sig == CANBOOT_SIGNATURE &&
req_sig == (void *)ALIGN((size_t)req_sig, 8))
{
irq_disable();
*req_sig = req_signature;
NVIC_SystemReset();
}
}
void
try_request_canboot(void)
{
canboot_reset(CANBOOT_REQUEST);
}
void
command_reset(uint32_t *args)
{
canboot_reset(CANBOOT_BYPASS);
NVIC_SystemReset();
}
DECL_COMMAND_FLAGS(command_reset, HF_IN_SHUTDOWN, "reset");