/* port->lock is not held. */
static void sc26xx_shutdown(struct uart_port *port)
{
/* disable interrupst */
sc26xx_disable_irq(port, IMR_TXRDY | IMR_RXRDY);
/* stop tx/rx */
WRITE_SC_PORT(port, CR, CR_DIS_TX | CR_DIS_RX);
}
static void sc26xx_shutdown(struct uart_port *port)
{
sc26xx_disable_irq(port, IMR_TXRDY | IMR_RXRDY);
WRITE_SC_PORT(port, CR, CR_DIS_TX | CR_DIS_RX);
}
/* port->lock is not held. */
static int sc26xx_startup(struct uart_port *port)
{
sc26xx_disable_irq(port, IMR_TXRDY | IMR_RXRDY);
WRITE_SC(port, OPCR, 0);
/* reset tx and rx */
WRITE_SC_PORT(port, CR, CR_RES_RX);
WRITE_SC_PORT(port, CR, CR_RES_TX);
/* start rx/tx */
WRITE_SC_PORT(port, CR, CR_ENA_TX | CR_ENA_RX);
/* enable irqs */
sc26xx_enable_irq(port, IMR_RXRDY);
return 0;
}
static int sc26xx_startup(struct uart_port *port)
{
sc26xx_disable_irq(port, IMR_TXRDY | IMR_RXRDY);
WRITE_SC(port, OPCR, 0);
WRITE_SC_PORT(port, CR, CR_RES_RX);
WRITE_SC_PORT(port, CR, CR_RES_TX);
WRITE_SC_PORT(port, CR, CR_ENA_TX | CR_ENA_RX);
sc26xx_enable_irq(port, IMR_RXRDY);
return 0;
}
static void transmit_chars(struct uart_port *port)
{
struct circ_buf *xmit;
if (!port->state)
return;
xmit = &port->state->xmit;
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
sc26xx_disable_irq(port, IMR_TXRDY);
return;
}
while (!uart_circ_empty(xmit)) {
if (!(READ_SC_PORT(port, SR) & SR_TXRDY))
break;
WRITE_SC_PORT(port, THR, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
}