serial: mxc: Add debug uart support

Add support for the debug UART to assist with early debugging. Enable it for i.CoreM6 as an example. Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> Reviewed-by: Simon Glass <sjg@chromium.org>

serial: mxc: Add debug uart support
Add support for the debug UART to assist with early debugging. Enable it for i.CoreM6 as an example. Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> Reviewed-by: Simon Glass <sjg@chromium.org>
Jagan Teki · Stefano Babic
1 parent 52c14cabda
Showing 3 changed files with 38 additions and 0 deletions Side-by-side Diff
configs/imx6qdl_icore_mmc_defconfig
drivers/serial/Kconfig
drivers/serial/serial_mxc.c
@@ -45,4 +45,8 @@
 CONFIG_MXC_UART=y
 CONFIG_IMX_THERMAL=y
 CONFIG_VIDEO_IPUV3=y
+CONFIG_DEBUG_UART=y
+CONFIG_DEBUG_UART_MXC=y
+CONFIG_DEBUG_UART_BASE=0x021f0000
+CONFIG_DEBUG_UART_CLOCK=24000000
@@ -248,6 +248,14 @@
 	  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_MXC
+	bool "IMX Serial port"
+	depends on MXC_UART
+	help
+	  Select this to enable a debug UART using the serial_mxc driver. You
+	  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_UNIPHIER
 	bool "UniPhier on-chip UART"
 	depends on ARCH_UNIPHIER
@@ -357,4 +357,30 @@
 	.flags = DM_FLAG_PRE_RELOC,
 };
 #endif
+
+#ifdef CONFIG_DEBUG_UART_MXC
+#include <debug_uart.h>
+
+static inline void _debug_uart_init(void)
+{
+	struct mxc_uart *base = (struct mxc_uart *)CONFIG_DEBUG_UART_BASE;
+
+	_mxc_serial_init(base);
+	_mxc_serial_setbrg(base, CONFIG_DEBUG_UART_CLOCK,
+			   CONFIG_BAUDRATE, false);
+}
+
+static inline void _debug_uart_putc(int ch)
+{
+	struct mxc_uart *base = (struct mxc_uart *)CONFIG_DEBUG_UART_BASE;
+
+	while (!(readl(&base->ts) & UTS_TXEMPTY))
+		WATCHDOG_RESET();
+
+	writel(ch, &base->txd);
+}
+
+DEBUG_UART_FUNCS
+
+#endif
...	...	@@ -45,4 +45,8 @@
45	45	CONFIG_MXC_UART=y
46	46	CONFIG_IMX_THERMAL=y
47	47	CONFIG_VIDEO_IPUV3=y
	48	+CONFIG_DEBUG_UART=y
	49	+CONFIG_DEBUG_UART_MXC=y
	50	+CONFIG_DEBUG_UART_BASE=0x021f0000
	51	+CONFIG_DEBUG_UART_CLOCK=24000000
...	...	@@ -248,6 +248,14 @@
248	248	will need to provide parameters to make this work. The driver will
249	249	be available until the real driver model serial is running.
250	250
	251	+config DEBUG_UART_MXC
	252	+ bool "IMX Serial port"
	253	+ depends on MXC_UART
	254	+ help
	255	+ Select this to enable a debug UART using the serial_mxc driver. You
	256	+ will need to provide parameters to make this work. The driver will
	257	+ be available until the real driver model serial is running.
	258	+
251	259	config DEBUG_UART_UNIPHIER
252	260	bool "UniPhier on-chip UART"
253	261	depends on ARCH_UNIPHIER
...	...	@@ -357,4 +357,30 @@
357	357	.flags = DM_FLAG_PRE_RELOC,
358	358	};
359	359	#endif
	360	+
	361	+#ifdef CONFIG_DEBUG_UART_MXC
	362	+#include <debug_uart.h>
	363	+
	364	+static inline void _debug_uart_init(void)
	365	+{
	366	+ struct mxc_uart base = (struct mxc_uart )CONFIG_DEBUG_UART_BASE;
	367	+
	368	+ _mxc_serial_init(base);
	369	+ _mxc_serial_setbrg(base, CONFIG_DEBUG_UART_CLOCK,
	370	+ CONFIG_BAUDRATE, false);
	371	+}
	372	+
	373	+static inline void _debug_uart_putc(int ch)
	374	+{
	375	+ struct mxc_uart base = (struct mxc_uart )CONFIG_DEBUG_UART_BASE;
	376	+
	377	+ while (!(readl(&base->ts) & UTS_TXEMPTY))
	378	+ WATCHDOG_RESET();
	379	+
	380	+ writel(ch, &base->txd);
	381	+}
	382	+
	383	+DEBUG_UART_FUNCS
	384	+
	385	+#endif