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pch_uart : Reduce memcpy 

Reduce memcpy for performance improvement.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tomoya MORINAGA 2011-02-23 10:03:14 +09:00 committed by Greg Kroah-Hartman
parent 7e46132965
commit 1822076cf3
1 changed files with 5 additions and 8 deletions
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13
drivers/tty/serial/pch_uart.c
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@ -390,7 +390,7 @@ static u8 pch_uart_hal_get_modem(struct eg20t_port *priv)
return get_msr(priv, priv->membase);
}
static int pch_uart_hal_write(struct eg20t_port *priv,
static void pch_uart_hal_write(struct eg20t_port *priv,
const unsigned char *buf, int tx_size)
{
int i;
@ -400,7 +400,6 @@ static int pch_uart_hal_write(struct eg20t_port *priv,
thr = buf[i++];
iowrite8(thr, priv->membase + PCH_UART_THR);
}
return i;
}
static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
@ -634,7 +633,7 @@ static void pch_dma_tx_complete(void *arg)
pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
}
static int pop_tx(struct eg20t_port *priv, unsigned char *buf, int size)
static int pop_tx(struct eg20t_port *priv, int size)
{
int count = 0;
struct uart_port *port = &priv->port;
@ -647,7 +646,7 @@ static int pop_tx(struct eg20t_port *priv, unsigned char *buf, int size)
int cnt_to_end =
CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
int sz = min(size - count, cnt_to_end);
memcpy(&buf[count], &xmit->buf[xmit->tail], sz);
pch_uart_hal_write(priv, &xmit->buf[xmit->tail], sz);
xmit->tail = (xmit->tail + sz) & (UART_XMIT_SIZE - 1);
count += sz;
} while (!uart_circ_empty(xmit) && count < size);
@ -723,7 +722,6 @@ static unsigned int handle_tx(struct eg20t_port *priv)
{
struct uart_port *port = &priv->port;
struct circ_buf *xmit = &port->state->xmit;
int ret;
int fifo_size;
int tx_size;
int size;
@ -748,10 +746,9 @@ static unsigned int handle_tx(struct eg20t_port *priv)
if (size < 0)
size = fifo_size;
tx_size = pop_tx(priv, xmit->buf, size);
tx_size = pop_tx(priv, size);
if (tx_size > 0) {
ret = pch_uart_hal_write(priv, xmit->buf, tx_size);
port->icount.tx += ret;
port->icount.tx += tx_size;
tx_empty = 0;
}