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[U-Boot,17/55] exynos: Add debug UART support for Samsung S5P serial

Message ID 1435882592-487-18-git-send-email-sjg@chromium.org
State Accepted
Delegated to: Simon Glass
Headers show

Commit Message

Simon Glass July 3, 2015, 12:15 a.m. UTC 
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(+)

Comments

Simon Glass July 27, 2015, 11:29 p.m. UTC | #1 
On 2 July 2015 at 18:15, Simon Glass <sjg@chromium.org> wrote:
> 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(+)

Applied to u-boot-dm.
diff mbox

Patch

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 4829284..e51f915 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -44,6 +44,13 @@  config DEBUG_UART_NS16550
 	  will need to provide parameters to make this work. The driver will
 	  be available until the real driver model serial is running.
 
+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 7abec53..4a553a3 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