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tty: serial: samsung_tty: loopback mode support

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Internal loopback mode can be supported by setting
UCON register's Loopback Mode bit. The mode & bit can be supported
since s3c2410 and later SoCs. The prefix of LOOPBACK / BIT(5) naming
should be also changed to S3C2410_ in order to avoid confusion.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Link: https://lore.kernel.org/r/20220629004141.51484-1-chanho61.park@samsung.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chanho Park 2022-06-29 09:41:41 +09:00 committed by Greg Kroah-Hartman
parent 9636047ffa
commit 72a43046b6
2 changed files with 9 additions and 1 deletions
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8
drivers/tty/serial/samsung_tty.c
View File

@ -1018,6 +1018,7 @@ static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
unsigned int umcon = rd_regl(port, S3C2410_UMCON);
unsigned int ucon = rd_reg(port, S3C2410_UCON);
if (mctrl & TIOCM_RTS)
umcon |= S3C2410_UMCOM_RTS_LOW;
@ -1025,6 +1026,13 @@ static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
umcon &= ~S3C2410_UMCOM_RTS_LOW;
wr_regl(port, S3C2410_UMCON, umcon);
if (mctrl & TIOCM_LOOP)
ucon |= S3C2410_UCON_LOOPBACK;
else
ucon &= ~S3C2410_UCON_LOOPBACK;
wr_regl(port, S3C2410_UCON, ucon);
}
static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)

2
include/linux/serial_s3c.h
View File

@ -83,7 +83,7 @@
#define S3C2410_UCON_RXIRQMODE (1<<0)
#define S3C2410_UCON_RXFIFO_TOI (1<<7)
#define S3C2443_UCON_RXERR_IRQEN (1<<6)
#define S3C2443_UCON_LOOPBACK (1<<5)
#define S3C2410_UCON_LOOPBACK (1<<5)
#define S3C2410_UCON_DEFAULT (S3C2410_UCON_TXILEVEL | \
S3C2410_UCON_RXILEVEL | \