/**
* Jump to what we hope is the init address of an image.
*
* This function does not return.
*
* @param init_addr Init address of target image
*/
static void jump_to_image(uintptr_t init_addr)
{
void (*resetvec)(void) = (void(*)(void))init_addr;
/*
* Jumping to any image asserts the signal to the Silego chip that that
* EC is not in read-only firmware. (This is not technically true if
* jumping from RO -> RO, but that's not a meaningful use case...).
*
* Pulse the signal long enough to set the latch in the Silego, then
* drop it again so we don't leak power through the pulldown in the
* Silego.
*/
gpio_set_level(GPIO_ENTERING_RW, 1);
usleep(MSEC);
gpio_set_level(GPIO_ENTERING_RW, 0);
#ifdef CONFIG_USB_POWER_DELIVERY
/*
* Notify USB PD module that we are about to sysjump and give it time
* to do what it needs.
*/
pd_prepare_sysjump();
usleep(5*MSEC);
#endif
/* Flush UART output unless the UART hasn't been initialized yet */
if (uart_init_done())
uart_flush_output();
/* Disable interrupts before jump */
interrupt_disable();
#ifdef CONFIG_DMA
/* Disable all DMA channels to avoid memory corruption */
dma_disable_all();
#endif /* CONFIG_DMA */
/* Fill in preserved data between jumps */
jdata->reserved0 = 0;
jdata->magic = JUMP_DATA_MAGIC;
jdata->version = JUMP_DATA_VERSION;
jdata->reset_flags = reset_flags;
jdata->jump_tag_total = 0; /* Reset tags */
jdata->struct_size = sizeof(struct jump_data);
/* Call other hooks; these may add tags */
hook_notify(HOOK_SYSJUMP);
/* Jump to the reset vector */
resetvec();
}
/**
* Jump to what we hope is the init address of an image.
*
* This function does not return.
*
* @param init_addr Init address of target image
*/
static void jump_to_image(uintptr_t init_addr)
{
void (*resetvec)(void) = (void(*)(void))init_addr;
/*
* Jumping to any image asserts the signal to the Silego chip that that
* EC is not in read-only firmware. (This is not technically true if
* jumping from RO -> RO, but that's not a meaningful use case...).
*
* Pulse the signal long enough to set the latch in the Silego, then
* drop it again so we don't leak power through the pulldown in the
* Silego.
*/
gpio_set_level(GPIO_ENTERING_RW, 1);
usleep(MSEC);
gpio_set_level(GPIO_ENTERING_RW, 0);
#ifdef CONFIG_USB_POWER_DELIVERY
/*
* On sysjump, we are most definitely going to drop pings (if any)
* and lose all of our PD state. Instead of trying to remember all
* the states and deal with on-going transmission, let's send soft
* reset here so that the communication starts over without dropping
* power.
*/
pd_soft_reset();
usleep(5*MSEC);
#endif
/* Flush UART output unless the UART hasn't been initialized yet */
if (uart_init_done())
uart_flush_output();
/* Disable interrupts before jump */
interrupt_disable();
/* Fill in preserved data between jumps */
jdata->reserved0 = 0;
jdata->magic = JUMP_DATA_MAGIC;
jdata->version = JUMP_DATA_VERSION;
jdata->reset_flags = reset_flags;
jdata->jump_tag_total = 0; /* Reset tags */
jdata->struct_size = sizeof(struct jump_data);
/* Call other hooks; these may add tags */
hook_notify(HOOK_SYSJUMP);
/* Jump to the reset vector */
resetvec();
}
/**
* Jump to what we hope is the init address of an image.
*
* This function does not return.
*
* @param init_addr Init address of target image
*/
static void jump_to_image(uintptr_t init_addr)
{
void (*resetvec)(void) = (void(*)(void))init_addr;
/*
* Jumping to any image asserts the signal to the Silego chip that that
* EC is not in read-only firmware. (This is not technically true if
* jumping from RO -> RO, but that's not a meaningful use case...).
*
* Pulse the signal long enough to set the latch in the Silego, then
* drop it again so we don't leak power through the pulldown in the
* Silego.
*/
gpio_set_level(GPIO_ENTERING_RW, 1);
usleep(MSEC);
gpio_set_level(GPIO_ENTERING_RW, 0);
/* Flush UART output unless the UART hasn't been initialized yet */
if (uart_init_done())
uart_flush_output();
/* Disable interrupts before jump */
interrupt_disable();
/* Fill in preserved data between jumps */
jdata->reserved0 = 0;
jdata->magic = JUMP_DATA_MAGIC;
jdata->version = JUMP_DATA_VERSION;
jdata->reset_flags = reset_flags;
jdata->jump_tag_total = 0; /* Reset tags */
jdata->struct_size = sizeof(struct jump_data);
/* Call other hooks; these may add tags */
hook_notify(HOOK_SYSJUMP);
/* Jump to the reset vector */
resetvec();
}
void uart_tx_start(void)
{
if (!uart_init_done())
return;
/* If interrupt is already enabled, nothing to do */
if (GR_UART_ICTRL(0) & GC_UART_ICTRL_TX_MASK)
return;
/* Do not allow deep sleep while transmit in progress */
disable_sleep(SLEEP_MASK_UART);
/*
* Re-enable the transmit interrupt, then forcibly trigger the
* interrupt. This works around a hardware problem with the
* UART where the FIFO only triggers the interrupt when its
* threshold is _crossed_, not just met.
*/
/* TODO(crosbug.com/p/33819): Do we need this hack here? Find out. */
REG_WRITE_MLV(GR_UART_ICTRL(0), GC_UART_ICTRL_TX_MASK,
GC_UART_ICTRL_TX_LSB, 1);
task_trigger_irq(GC_IRQNUM_UART0_TXINT);
}
