static void lpc_tick(void)
{
/*
* Make sure pending LPC interrupts have been processed.
* This works around a LM4 bug where host writes sometimes
* don't trigger interrupts. See crosbug.com/p/13965.
*/
task_trigger_irq(LM4_IRQ_LPC);
}
void uart_tx_start(void)
{
/* 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);
}
