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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 <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Chanho Park <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Chanho Park authored and Greg Kroah-Hartman committed 2022-06-30 17:09:08 +02:00
1 parent 9636047ffa
commit 72a43046b6
2 files changed
+9 -1
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drivers/tty/serial/samsung_tty.c
+8
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)
include/linux/serial_s3c.h
+1 -1
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 | \