示例#1
0
文件: system.c 项目: thehobn/ec
/**
 * 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();
}
示例#2
0
文件: system.c 项目: longsleep/ec
/**
 * 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();
}
示例#3
0
/**
 * 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();
}
示例#4
0
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);
}