diff options
| author | Karicheri, Muralidharan <m-karicheri2@ti.com> | 2014-04-09 15:38:46 -0400 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2014-05-12 15:19:45 -0400 |
| commit | d57dee5787ad96d2c80bf36f443276592d39ee21 (patch) | |
| tree | 041f13aa1af9bbbeadb587c15a27e5a0496c5ae9 | |
| parent | 8abd053cf07a1e4264d59c671e05a602fc7a31ad (diff) | |
serial: nsl16550: add hw flow control support
keystone serial hw support hw flow control. This patch
enables hw flow control for keystone EVMs as an optional
feature based on CONFIG_SERIAL_HW_FLOW_CONTROL.
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
| -rw-r--r-- | README | 4 | ||||
| -rw-r--r-- | drivers/serial/ns16550.c | 6 | ||||
| -rw-r--r-- | include/ns16550.h | 1 |
3 files changed, 11 insertions, 0 deletions
@@ -751,6 +751,10 @@ The following options need to be configured: boot loader that has already initialized the UART. Define this variable to flush the UART at init time. + CONFIG_SERIAL_HW_FLOW_CONTROL + + Define this variable to enable hw flow control in serial driver. + Current user of this option is drivers/serial/nsl16550.c driver - Console Interface: Depending on board, define exactly one serial port diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c index 8a13454943..f26979dbe1 100644 --- a/drivers/serial/ns16550.c +++ b/drivers/serial/ns16550.c @@ -33,6 +33,12 @@ #if defined(CONFIG_K2HK_EVM) #define UART_REG_VAL_PWREMU_MGMT_UART_DISABLE 0 #define UART_REG_VAL_PWREMU_MGMT_UART_ENABLE ((1 << 14) | (1 << 13) | (1 << 0)) +#undef UART_MCRVAL +#ifdef CONFIG_SERIAL_HW_FLOW_CONTROL +#define UART_MCRVAL (UART_MCR_RTS | UART_MCR_AFE) +#else +#define UART_MCRVAL (UART_MCR_RTS) +#endif #endif #ifndef CONFIG_SYS_NS16550_IER diff --git a/include/ns16550.h b/include/ns16550.h index 51cb5b4a66..17f829f6f9 100644 --- a/include/ns16550.h +++ b/include/ns16550.h @@ -100,6 +100,7 @@ typedef struct NS16550 *NS16550_t; #define UART_MCR_OUT1 0x04 /* Out 1 */ #define UART_MCR_OUT2 0x08 /* Out 2 */ #define UART_MCR_LOOP 0x10 /* Enable loopback test mode */ +#define UART_MCR_AFE 0x20 /* Enable auto-RTS/CTS */ #define UART_MCR_DMA_EN 0x04 #define UART_MCR_TX_DFR 0x08 |