[U-Boot] [PATCH 3/4] serial: ns16550: add definitions for register mdr1

[Matthijs van Duin]

Signed-off-by: Matthijs van Duin <matthijsvand...@gmail.com>
---
 drivers/serial/ns16550.c | 10 +++++-----
 include/ns16550.h        | 14 ++++++++++++++
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 5ac2469b5760..41eb098c847e 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -166,7 +166,7 @@ void NS16550_init(NS16550_t com_port, int baud_divisor)
             == UART_LSR_THRE) {
                if (baud_divisor != -1)
                        NS16550_setbrg(com_port, baud_divisor);
-               serial_out(0, &com_port->mdr1);
+               serial_out(UART_MDR1_16X, &com_port->mdr1);
        }
 #endif
 
@@ -175,7 +175,7 @@ void NS16550_init(NS16550_t com_port, int baud_divisor)
 
        serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
 #ifdef CONFIG_NS16550_OMAP
-       serial_out(0x7, &com_port->mdr1);       /* mode select reset TL16C750*/
+       serial_out(UART_MDR1_DISABLE, &com_port->mdr1);
 #endif
        serial_out(UART_MCRVAL, &com_port->mcr);
        serial_out(ns16550_getfcr(com_port), &com_port->fcr);
@@ -183,7 +183,7 @@ void NS16550_init(NS16550_t com_port, int baud_divisor)
                NS16550_setbrg(com_port, baud_divisor);
 #ifdef CONFIG_NS16550_OMAP
        /* /16 is proper to hit 115200 with 48MHz */
-       serial_out(0, &com_port->mdr1);
+       serial_out(UART_MDR1_16X, &com_port->mdr1);
 #endif
 #ifdef CONFIG_NS16550_C6X
        serial_out(UART_REG_VAL_PWREMU_MGMT_UART_ENABLE, &com_port->pwr_mgmt);
@@ -289,7 +289,7 @@ static inline void _debug_uart_init(void)
        baud_divisor = ns16550_calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
                                            CONFIG_BAUDRATE);
        serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
-       serial_dout(&com_port->mdr1, 0x7);
+       serial_dout(&com_port->mdr1, UART_MDR1_DISABLE);
        serial_dout(&com_port->mcr, UART_MCRVAL);
        serial_dout(&com_port->fcr, UART_FCR_DEFVAL);
 
@@ -297,7 +297,7 @@ static inline void _debug_uart_init(void)
        serial_dout(&com_port->dll, baud_divisor & 0xff);
        serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
        serial_dout(&com_port->lcr, UART_LCRVAL);
-       serial_dout(&com_port->mdr1, 0x0);
+       serial_dout(&com_port->mdr1, UART_MDR1_16X);
 }
 
 static inline void _debug_uart_putc(int ch)
diff --git a/include/ns16550.h b/include/ns16550.h
index 4a87ab9c8e71..540337258c1e 100644
--- a/include/ns16550.h
+++ b/include/ns16550.h
@@ -208,6 +208,20 @@ typedef struct NS16550 *NS16550_t;
 /* useful defaults for LCR */
 #define UART_LCR_8N1   0x03
 
+/*
+ * These are the definitions for Mode Definition Register 1
+ */
+#if defined(CONFIG_NS16550_C6X)
+#define UART_MDR1_16X          0x00    /* 16x oversampling (default) */
+#define UART_MDR1_13X          0x01    /* 13x oversampling */
+#elif defined(CONFIG_NS16550_OMAP)
+#define UART_MDR1_16X          0x00    /* 16x oversampling */
+#define UART_MDR1_16X_AUTOBAUD 0x02    /* 16x oversampling, auto-baud */
+#define UART_MDR1_13X          0x03    /* 13x oversampling */
+#define UART_MDR1_DISABLE      0x07    /* disable uart (default) */
+/* other values/bits are for infrared modes */
+#endif
+
 void NS16550_init(NS16550_t com_port, int baud_divisor);
 void NS16550_putc(NS16550_t com_port, char c);
 char NS16550_getc(NS16550_t com_port);
-- 
2.11.0

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