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serial: nsl16550: add hw flow control support

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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>
This commit is contained in:
Karicheri, Muralidharan 2014-04-09 15:38:46 -04:00 committed by Tom Rini
parent 8abd053cf0
commit d57dee5787
3 changed files with 11 additions and 0 deletions
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4
README
View file

@ -751,6 +751,10 @@ The following options need to be configured:
boot loader that has already initialized the UART. Define this boot loader that has already initialized the UART. Define this
variable to flush the UART at init time. 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: - Console Interface:
Depending on board, define exactly one serial port Depending on board, define exactly one serial port

6
drivers/serial/ns16550.c
View file

@ -33,6 +33,12 @@
#if defined(CONFIG_K2HK_EVM) #if defined(CONFIG_K2HK_EVM)
#define UART_REG_VAL_PWREMU_MGMT_UART_DISABLE 0 #define UART_REG_VAL_PWREMU_MGMT_UART_DISABLE 0
#define UART_REG_VAL_PWREMU_MGMT_UART_ENABLE ((1 << 14) | (1 << 13) | (1 << 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 #endif
#ifndef CONFIG_SYS_NS16550_IER #ifndef CONFIG_SYS_NS16550_IER

1
include/ns16550.h
View file

@ -100,6 +100,7 @@ typedef struct NS16550 *NS16550_t;
#define UART_MCR_OUT1 0x04 /* Out 1 */ #define UART_MCR_OUT1 0x04 /* Out 1 */
#define UART_MCR_OUT2 0x08 /* Out 2 */ #define UART_MCR_OUT2 0x08 /* Out 2 */
#define UART_MCR_LOOP 0x10 /* Enable loopback test mode */ #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_DMA_EN 0x04
#define UART_MCR_TX_DFR 0x08 #define UART_MCR_TX_DFR 0x08