From bf6e702232e3b8c38fe0934c1f0240958eaabed3 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Thu, 2 Jul 2015 18:15:54 -0600
Subject: [PATCH] exynos: Add debug UART support for Samsung S5P serial
Add a debug UART implementation for this serial driver. It does not set up
pinmux automatically - this must be done before calling debug_uart_init().
Signed-off-by: Simon Glass <sjg@chromium.org>
---
drivers/serial/Kconfig | 7 +++++++
drivers/serial/serial_s5p.c | 25 +++++++++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index b5a91b707e..fd126a825f 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -53,6 +53,13 @@ config DEBUG_EFI_CONSOLE
U-Boot when running on top of EFI (Extensive Firmware Interface).
This is a type of BIOS used by PCs.
+config DEBUG_UART_S5P
+ bool "Samsung S5P"
+ help
+ Select this to enable a debug UART using the serial_s5p driver. You
+ will need to provide parameters to make this work. The driver will
+ be available until the real driver-model serial is running.
+
endchoice
config DEBUG_UART_BASE
diff --git a/drivers/serial/serial_s5p.c b/drivers/serial/serial_s5p.c
index 7abec53f80..4a553a37b8 100644
--- a/drivers/serial/serial_s5p.c
+++ b/drivers/serial/serial_s5p.c
@@ -200,3 +200,28 @@ U_BOOT_DRIVER(serial_s5p) = {
.ops = &s5p_serial_ops,
.flags = DM_FLAG_PRE_RELOC,
};
+
+#ifdef CONFIG_DEBUG_UART_S5P
+
+#include <debug_uart.h>
+
+void debug_uart_init(void)
+{
+ struct s5p_uart *uart = (struct s5p_uart *)CONFIG_DEBUG_UART_BASE;
+
+ s5p_serial_init(uart);
+ s5p_serial_baud(uart, CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE);
+}
+
+static inline void _debug_uart_putc(int ch)
+{
+ struct s5p_uart *uart = (struct s5p_uart *)CONFIG_DEBUG_UART_BASE;
+
+ while (readl(&uart->ufstat) & TX_FIFO_FULL);
+
+ writeb(ch, &uart->utxh);
+}
+
+DEBUG_UART_FUNCS
+
+#endif
--
2.39.5