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serial: imx: make setup_ufcr more useful 

This function currently doesn't use its parameter.

Change prototype to pass in watermark levels, so we can reuse this
function in the DMA setup paths. Also relocate to be near the calling
functions.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lucas Stach 2015-09-04 17:52:37 +02:00 committed by Greg Kroah-Hartman
parent 7693c79ce0
commit cc32382d9f
1 changed files with 19 additions and 18 deletions
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37
drivers/tty/serial/imx.c
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@ -852,19 +852,6 @@ static void imx_break_ctl(struct uart_port *port, int break_state)
spin_unlock_irqrestore(&sport->port.lock, flags);
}
#define TXTL 2 /* reset default */
#define RXTL 1 /* reset default */
static void imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
{
unsigned int val;
/* set receiver / transmitter trigger level */
val = readl(sport->port.membase + UFCR) & (UFCR_RFDIV | UFCR_DCEDTE);
val |= TXTL << UFCR_TXTL_SHF | RXTL;
writel(val, sport->port.membase + UFCR);
}
#define RX_BUF_SIZE (PAGE_SIZE)
static void imx_rx_dma_done(struct imx_port *sport)
{
@ -980,6 +967,20 @@ static int start_rx_dma(struct imx_port *sport)
return 0;
}
#define TXTL_DEFAULT 2 /* reset default */
#define RXTL_DEFAULT 1 /* reset default */
static void imx_setup_ufcr(struct imx_port *sport,
unsigned char txwl, unsigned char rxwl)
{
unsigned int val;
/* set receiver / transmitter trigger level */
val = readl(sport->port.membase + UFCR) & (UFCR_RFDIV | UFCR_DCEDTE);
val |= txwl << UFCR_TXTL_SHF | rxwl;
writel(val, sport->port.membase + UFCR);
}
static void imx_uart_dma_exit(struct imx_port *sport)
{
if (sport->dma_chan_rx) {
@ -1015,7 +1016,7 @@ static int imx_uart_dma_init(struct imx_port *sport)
slave_config.direction = DMA_DEV_TO_MEM;
slave_config.src_addr = sport->port.mapbase + URXD0;
slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
slave_config.src_maxburst = RXTL;
slave_config.src_maxburst = RXTL_DEFAULT;
ret = dmaengine_slave_config(sport->dma_chan_rx, &slave_config);
if (ret) {
dev_err(dev, "error in RX dma configuration.\n");
@ -1039,7 +1040,7 @@ static int imx_uart_dma_init(struct imx_port *sport)
slave_config.direction = DMA_MEM_TO_DEV;
slave_config.dst_addr = sport->port.mapbase + URTX0;
slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
slave_config.dst_maxburst = TXTL;
slave_config.dst_maxburst = TXTL_DEFAULT;
ret = dmaengine_slave_config(sport->dma_chan_tx, &slave_config);
if (ret) {
dev_err(dev, "error in TX dma configuration.");
@ -1115,7 +1116,7 @@ static int imx_startup(struct uart_port *port)
return retval;
}
imx_setup_ufcr(sport, 0);
imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT);
/* disable the DREN bit (Data Ready interrupt enable) before
* requesting IRQs
@ -1503,7 +1504,7 @@ static int imx_poll_init(struct uart_port *port)
if (retval)
clk_disable_unprepare(sport->clk_ipg);
imx_setup_ufcr(sport, 0);
imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT);
spin_lock_irqsave(&sport->port.lock, flags);
@ -1773,7 +1774,7 @@ imx_console_setup(struct console *co, char *options)
else
imx_console_get_options(sport, &baud, &parity, &bits);
imx_setup_ufcr(sport, 0);
imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT);
retval = uart_set_options(&sport->port, co, baud, parity, bits, flow);