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[Blackfin] serial driver: Clean up UART DMA code. 

Start next TX DMA in tx dma handler instead of rx timer handler.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
This commit is contained in:
Sonic Zhang 2007-12-21 16:45:12 +08:00 committed by Bryan Wu
parent 759eb04090
commit 1b73351c6a
1 changed files with 15 additions and 20 deletions
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35
drivers/serial/bfin_5xx.c
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@ -84,7 +84,7 @@ static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
static void bfin_serial_stop_tx(struct uart_port *port)
{
struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
#ifndef CONFIG_BF54x
#if !defined(CONFIG_BF54x) && !defined(CONFIG_SERIAL_BFIN_DMA)
unsigned short ier;
#endif
@ -307,7 +307,6 @@ static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
UART_PUT_CHAR(uart, uart->port.x_char);
uart->port.icount.tx++;
uart->port.x_char = 0;
return;
}
/*
* Check the modem control lines before
@ -376,28 +375,26 @@ static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
if (!uart->tx_done)
return;
uart->tx_done = 0;
if (uart->port.x_char) {
UART_PUT_CHAR(uart, uart->port.x_char);
uart->port.icount.tx++;
uart->port.x_char = 0;
uart->tx_done = 1;
return;
}
/*
* Check the modem control lines before
* transmitting anything.
*/
bfin_serial_mctrl_check(uart);
if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
bfin_serial_stop_tx(&uart->port);
uart->tx_done = 1;
return;
}
if (uart->port.x_char) {
UART_PUT_CHAR(uart, uart->port.x_char);
uart->port.icount.tx++;
uart->port.x_char = 0;
}
/*
* Check the modem control lines before
* transmitting anything.
*/
bfin_serial_mctrl_check(uart);
spin_lock_irqsave(&uart->port.lock, flags);
uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
@ -471,8 +468,6 @@ void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
int x_pos, pos;
int flags = 0;
bfin_serial_dma_tx_chars(uart);
spin_lock_irqsave(&uart->port.lock, flags);
x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel);
if (x_pos == DMA_RX_XCOUNT)
@ -513,9 +508,9 @@ static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&uart->port);
if (uart_circ_empty(xmit))
bfin_serial_stop_tx(&uart->port);
uart->tx_done = 1;
bfin_serial_dma_tx_chars(uart);
}
spin_unlock(&uart->port.lock);