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imx: Add save/restore functions for UART control regs 

Factor out the uart save/restore functionality instead of
having the same code several times in the driver.

Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
CC: Saleem Abdulrasool <compnerd@compnerd.org>
CC: Sascha Hauer <s.hauer@pengutronix.de>
CC: Fabio Estevam <festevam@gmail.com>
CC: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
CC: linux-serial@vger.kernel.org
CC: Alan Cox <alan@linux.intel.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Dirk Behme 2011-12-22 09:57:52 +01:00 committed by Greg Kroah-Hartman
parent 20bb8095a4
commit 0ad5a81472
1 changed files with 35 additions and 8 deletions
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43
drivers/tty/serial/imx.c
View File

@ -207,6 +207,12 @@ struct imx_port {
struct imx_uart_data *devdata; struct imx_uart_data *devdata;
}; };
struct imx_port_ucrs {
unsigned int ucr1;
unsigned int ucr2;
unsigned int ucr3;
};
#ifdef CONFIG_IRDA #ifdef CONFIG_IRDA
#define USE_IRDA(sport) ((sport)->use_irda) #define USE_IRDA(sport) ((sport)->use_irda)
#else #else
@ -259,6 +265,27 @@ static inline int is_imx21_uart(struct imx_port *sport)
return sport->devdata->devtype == IMX21_UART; return sport->devdata->devtype == IMX21_UART;
} }
/*
* Save and restore functions for UCR1, UCR2 and UCR3 registers
*/
static void imx_port_ucrs_save(struct uart_port *port,
struct imx_port_ucrs *ucr)
{
/* save control registers */
ucr->ucr1 = readl(port->membase + UCR1);
ucr->ucr2 = readl(port->membase + UCR2);
ucr->ucr3 = readl(port->membase + UCR3);
}
static void imx_port_ucrs_restore(struct uart_port *port,
struct imx_port_ucrs *ucr)
{
/* restore control registers */
writel(ucr->ucr1, port->membase + UCR1);
writel(ucr->ucr2, port->membase + UCR2);
writel(ucr->ucr3, port->membase + UCR3);
}
/* /*
* Handle any change of modem status signal since we were last called. * Handle any change of modem status signal since we were last called.
*/ */
@ -1121,13 +1148,14 @@ static void
imx_console_write(struct console *co, const char *s, unsigned int count) imx_console_write(struct console *co, const char *s, unsigned int count)
{ {
struct imx_port *sport = imx_ports[co->index]; struct imx_port *sport = imx_ports[co->index];
unsigned int old_ucr1, old_ucr2, ucr1; struct imx_port_ucrs old_ucr;
unsigned int ucr1;
/* /*
* First, save UCR1/2 and then disable interrupts * First, save UCR1/2/3 and then disable interrupts
*/ */
ucr1 = old_ucr1 = readl(sport->port.membase + UCR1); imx_port_ucrs_save(&sport->port, &old_ucr);
old_ucr2 = readl(sport->port.membase + UCR2); ucr1 = old_ucr.ucr1;
if (is_imx1_uart(sport)) if (is_imx1_uart(sport))
ucr1 |= IMX1_UCR1_UARTCLKEN; ucr1 |= IMX1_UCR1_UARTCLKEN;
@ -1136,18 +1164,17 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
writel(ucr1, sport->port.membase + UCR1); writel(ucr1, sport->port.membase + UCR1);
writel(old_ucr2 | UCR2_TXEN, sport->port.membase + UCR2); writel(old_ucr.ucr2 | UCR2_TXEN, sport->port.membase + UCR2);
uart_console_write(&sport->port, s, count, imx_console_putchar); uart_console_write(&sport->port, s, count, imx_console_putchar);
/* /*
* Finally, wait for transmitter to become empty * Finally, wait for transmitter to become empty
* and restore UCR1/2 * and restore UCR1/2/3
*/ */
while (!(readl(sport->port.membase + USR2) & USR2_TXDC)); while (!(readl(sport->port.membase + USR2) & USR2_TXDC));
writel(old_ucr1, sport->port.membase + UCR1); imx_port_ucrs_restore(&sport->port, &old_ucr);
writel(old_ucr2, sport->port.membase + UCR2);
} }
/* /*