static int uart_port_startup(struct tty_struct *tty, struct uart_state *state,
int init_hw)
{
struct uart_port *uport = state->uart_port;
struct tty_port *port = &state->port;
unsigned long page;
int retval = 0;
if (uport->type == PORT_UNKNOWN)
return 1;
if (!state->xmit.buf) {
page = get_zeroed_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
state->xmit.buf = (unsigned char *) page;
uart_circ_clear(&state->xmit);
}
retval = uport->ops->startup(uport);
if (retval == 0) {
if (uart_console(uport) && uport->cons->cflag) {
tty->termios->c_cflag = uport->cons->cflag;
uport->cons->cflag = 0;
}
uart_change_speed(tty, state, NULL);
if (init_hw) {
if (tty->termios->c_cflag & CBAUD)
uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR);
}
if (port->flags & ASYNC_CTS_FLOW) {
spin_lock_irq(&uport->lock);
if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS))
tty->hw_stopped = 1;
spin_unlock_irq(&uport->lock);
}
}
if (retval && capable(CAP_SYS_ADMIN))
return 1;
return retval;
}
static void msm_hsl_start_tx(struct uart_port *port)
{
struct msm_hsl_port *msm_hsl_port = UART_TO_MSM(port);
struct circ_buf *xmit = &port->state->xmit;
if(b_terminal_onoff == 0 && console_uart_port && (port == console_uart_port)){
uart_circ_clear(xmit);
return;
}
clk_en(port, 1);
msm_hsl_port->imr |= UARTDM_ISR_TXLEV_BMSK;
msm_hsl_write(port, msm_hsl_port->imr, UARTDM_IMR_ADDR);
clk_en(port, 0);
}
static int mtk8250_startup(struct uart_port *port)
{
#ifdef CONFIG_SERIAL_8250_DMA
struct uart_8250_port *up = up_to_u8250p(port);
struct mtk8250_data *data = port->private_data;
/* disable DMA for console */
if (uart_console(port))
up->dma = NULL;
if (up->dma) {
data->rx_status = DMA_RX_START;
uart_circ_clear(&port->state->xmit);
}
#endif
memset(&port->icount, 0, sizeof(port->icount));
return serial8250_do_startup(port);
}
static void uart_flush_buffer(struct tty_struct *tty)
{
struct uart_state *state = tty->driver_data;
struct uart_port *port;
unsigned long flags;
if (!state) {
WARN_ON(1);
return;
}
port = state->uart_port;
pr_debug("uart_flush_buffer(%d) called\n", tty->index);
spin_lock_irqsave(&port->lock, flags);
uart_circ_clear(&state->xmit);
if (port->ops->flush_buffer)
port->ops->flush_buffer(port);
spin_unlock_irqrestore(&port->lock, flags);
tty_wakeup(tty);
}
