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ns16550: support for UART with broken FIFO 

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Antony Pavlov 2012-01-18 10:31:53 +04:00 committed by Sascha Hauer
parent 2c9bc534ce
commit 5891ba14b8
2 changed files with 18 additions and 2 deletions
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18
drivers/serial/serial_ns16550.c
View File

@ -139,6 +139,8 @@ static unsigned int ns16550_calc_divisor(struct console_device *cdev,
static void ns16550_serial_init_port(struct console_device *cdev)
{
unsigned int baud_divisor;
struct NS16550_plat *plat = (struct NS16550_plat *)
cdev->dev->platform_data;
/* Setup the serial port with the defaults first */
baud_divisor = ns16550_calc_divisor(cdev, CONFIG_BAUDRATE);
@ -153,7 +155,12 @@ static void ns16550_serial_init_port(struct console_device *cdev)
ns16550_write(cdev, (baud_divisor >> 8) & 0xff, dlm);
ns16550_write(cdev, LCRVAL, lcr);
ns16550_write(cdev, MCRVAL, mcr);
ns16550_write(cdev, FCRVAL, fcr);
if (plat->flags & NS16650_FLAG_DISABLE_FIFO)
ns16550_write(cdev, FCRVAL & ~FCR_FIFO_EN, fcr);
else
ns16550_write(cdev, FCRVAL, fcr);
#ifdef CONFIG_DRIVER_SERIAL_NS16550_OMAP_EXTENSIONS
ns16550_write(cdev, 0x00, mdr1);
#endif
@ -211,6 +218,8 @@ static int ns16550_tstc(struct console_device *cdev)
static int ns16550_setbaudrate(struct console_device *cdev, int baud_rate)
{
unsigned int baud_divisor = ns16550_calc_divisor(cdev, baud_rate);
struct NS16550_plat *plat = (struct NS16550_plat *)
cdev->dev->platform_data;
ns16550_write(cdev, 0x00, ier);
ns16550_write(cdev, LCR_BKSE, lcr);
@ -218,7 +227,12 @@ static int ns16550_setbaudrate(struct console_device *cdev, int baud_rate)
ns16550_write(cdev, (baud_divisor >> 8) & 0xff, dlm);
ns16550_write(cdev, LCRVAL, lcr);
ns16550_write(cdev, MCRVAL, mcr);
ns16550_write(cdev, FCRVAL, fcr);
if (plat->flags & NS16650_FLAG_DISABLE_FIFO)
ns16550_write(cdev, FCRVAL & ~FCR_FIFO_EN, fcr);
else
ns16550_write(cdev, FCRVAL, fcr);
return 0;
}

2
include/ns16550.h
View File

@ -52,6 +52,8 @@ struct NS16550_plat {
unsigned char reg_offset);
int shift;
unsigned int flags;
#define NS16650_FLAG_DISABLE_FIFO 1
};
#endif /* __NS16650_PLATFORM_H_ */