[U-Boot-Users] [PATCH] resubmit: PPC440: Add flow control for serial port

[Niklaus Giger]

Sorry for my mistake in my first submission..

This has been tested on our HCU5 PPC440EPx based board, where we
have only one serial port.

Signed-off-by: Niklaus Giger <niklaus.giger at netstal.com>
---
 cpu/ppc4xx/serial.c |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/cpu/ppc4xx/serial.c b/cpu/ppc4xx/serial.c
index 60712b1..4cba836 100644
--- a/cpu/ppc4xx/serial.c
+++ b/cpu/ppc4xx/serial.c
@@ -490,6 +490,21 @@ static void serial_divs (int baudrate, unsigned long *pudiv,
 }
 #endif /* defined(CONFIG_440) && !defined(CFG_EXT_SERIAL_CLK) */
 
+#if defined(CONFIG_CMD_HWFLOW) && defined(CONFIG_440) && !defined(CONFIG_SERIAL_MULTI)
+int hwflow_onoff(int flow_on)
+{
+	if (flow_on == 1) {
+		out8(UART_BASE + UART_MCR, 0x0b);	/* The OUT2 bit may be written and read
+	                                           but it provides no function */
+	}
+	else
+	{
+		out8(UART_BASE + UART_MCR, 0x00);	/* no modem control DTR RTS */
+	}
+	return 0;
+}
+#endif
+
 /*
  * Minimal serial functions needed to use one of the SMC ports
  * as serial console interface.
@@ -548,7 +563,12 @@ int serial_init(void)
 	out8(UART_BASE + UART_DLM, bdiv >> 8);	/* set baudrate divisor */
 	out8(UART_BASE + UART_LCR, 0x03);	/* clear DLAB; set 8 bits, no parity */
 	out8(UART_BASE + UART_FCR, 0x00);	/* disable FIFO */
+#ifdef CONFIG_CMD_HWFLOW
+	out8(UART_BASE + UART_MCR, 0x0b);	/* The OUT2 bit may be written and read
+	                                           but it provides no function */
+#else
 	out8(UART_BASE + UART_MCR, 0x00);	/* no modem control DTR RTS */
+#endif
 	val = in8(UART_BASE + UART_LSR);	/* clear line status */
 	val = in8(UART_BASE + UART_RBR);	/* read receive buffer */
 	out8(UART_BASE + UART_SCR, 0x00);	/* set scratchpad */
-- 
1.5.2