From 24231893d62616be3325c0e3f8c2f21b7d40ac65 Mon Sep 17 00:00:00 2001
From: Marcello Sylvester Bauer <info@marcellobauer.com>
Date: Wed, 11 Apr 2018 15:55:02 +0200
Subject: drivers/uart/pl011.c Add read support

Implement uart_rx_byte

Change-Id: I5a33b3cd4b333fb244bc55747014a301021e25e0
Signed-off-by: Marcello Sylvester Bauer <info@marcellobauer.com>
Reviewed-on: https://review.coreboot.org/25623
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
 src/drivers/uart/pl011.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'src/drivers')

diff --git a/src/drivers/uart/pl011.c b/src/drivers/uart/pl011.c
index 415dce13bc..9cb702f952 100644
--- a/src/drivers/uart/pl011.c
+++ b/src/drivers/uart/pl011.c
@@ -42,7 +42,11 @@ void uart_tx_flush(int idx)
 
 unsigned char uart_rx_byte(int idx)
 {
-	return 0;
+	struct pl011_uart *regs = uart_platform_baseptr(idx);
+
+	while (read32(&regs->fr) & PL011_UARTFR_RXFE)
+		;
+	return read8(&regs->dr);
 }
 
 #ifndef __PRE_RAM__
-- 
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