ARM: imx6q: let users input debug uart port number

imx6q gets 5 uart ports in total.  Different board design may choose
different port as debug uart.  For example, imx6q-sabresd uses UART1,
imx6q-sabrelite uses UART2 and imx6q-arm2 uses UART4.  Rather than
bloating DEBUG_LL choice list with all these uart ports, the patch
introduces DEBUG_IMX6Q_UART_PORT for users to input uart port number
when DEBUG_IMX6Q_UART is selected inside DEBUG_LL choice.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/Kconfig.debug

@@ -209,20 +209,12 @@ choice
 		  Say Y here if you want kernel low-level debugging support
 		  on i.MX50 or i.MX53.
 
-	config DEBUG_IMX6Q_UART2
-		bool "i.MX6Q Debug UART2"
+	config DEBUG_IMX6Q_UART
+		bool "i.MX6Q Debug UART"
 		depends on SOC_IMX6Q
 		help
 		  Say Y here if you want kernel low-level debugging support
-		  on i.MX6Q UART2. This is correct for e.g. the SabreLite
-                  board.
-
-	config DEBUG_IMX6Q_UART4
-		bool "i.MX6Q Debug UART4"
-		depends on SOC_IMX6Q
-		help
-		  Say Y here if you want kernel low-level debugging support
-		  on i.MX6Q UART4.
+		  on i.MX6Q.
 
 	config DEBUG_MMP_UART2
 		bool "Kernel low-level debugging message via MMP UART2"
@@ -409,6 +401,15 @@ choice
 
 endchoice
 
+config DEBUG_IMX6Q_UART_PORT
+	int "i.MX6Q Debug UART Port (1-5)" if DEBUG_IMX6Q_UART
+	range 1 5
+	default 1
+	depends on SOC_IMX6Q
+	help
+	  Choose UART port on which kernel low-level debug messages
+	  should be output.
+
 config DEBUG_LL_INCLUDE
 	string
 	default "debug/icedcc.S" if DEBUG_ICEDCC
@@ -418,8 +419,7 @@ config DEBUG_LL_INCLUDE
 				 DEBUG_IMX31_IMX35_UART || \
 				 DEBUG_IMX51_UART || \
 				 DEBUG_IMX50_IMX53_UART ||\
-				 DEBUG_IMX6Q_UART2 || \
-				 DEBUG_IMX6Q_UART4
+				 DEBUG_IMX6Q_UART
 	default "debug/highbank.S" if DEBUG_HIGHBANK_UART
 	default "debug/mvebu.S" if DEBUG_MVEBU_UART
 	default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART

arch/arm/include/debug/imx.S

@@ -10,6 +10,20 @@
  * published by the Free Software Foundation.
  *
  */
+#define IMX6Q_UART1_BASE_ADDR	0x02020000
+#define IMX6Q_UART2_BASE_ADDR	0x021e8000
+#define IMX6Q_UART3_BASE_ADDR	0x021ec000
+#define IMX6Q_UART4_BASE_ADDR	0x021f0000
+#define IMX6Q_UART5_BASE_ADDR	0x021f4000
+
+/*
+ * IMX6Q_UART_BASE_ADDR is put in the middle to force the expansion
+ * of IMX6Q_UART##n##_BASE_ADDR.
+ */
+#define IMX6Q_UART_BASE_ADDR(n)	IMX6Q_UART##n##_BASE_ADDR
+#define IMX6Q_UART_BASE(n)	IMX6Q_UART_BASE_ADDR(n)
+#define IMX6Q_DEBUG_UART_BASE	IMX6Q_UART_BASE(CONFIG_DEBUG_IMX6Q_UART_PORT)
+
 #ifdef CONFIG_DEBUG_IMX1_UART
 #define UART_PADDR	0x00206000
 #elif defined (CONFIG_DEBUG_IMX25_UART)
@@ -22,10 +36,8 @@
 #define UART_PADDR	0x73fbc000
 #elif defined (CONFIG_DEBUG_IMX50_IMX53_UART)
 #define UART_PADDR	0x53fbc000
-#elif defined (CONFIG_DEBUG_IMX6Q_UART2)
-#define UART_PADDR	0x021e8000
-#elif defined (CONFIG_DEBUG_IMX6Q_UART4)
-#define UART_PADDR	0x021f0000
+#elif defined (CONFIG_DEBUG_IMX6Q_UART)
+#define UART_PADDR	IMX6Q_DEBUG_UART_BASE
 #endif
 
 /*

arch/arm/mach-imx/lluart.c

@@ -17,17 +17,25 @@
 
 #include "hardware.h"
 
+#define IMX6Q_UART1_BASE_ADDR	0x02020000
+#define IMX6Q_UART2_BASE_ADDR	0x021e8000
+#define IMX6Q_UART3_BASE_ADDR	0x021ec000
+#define IMX6Q_UART4_BASE_ADDR	0x021f0000
+#define IMX6Q_UART5_BASE_ADDR	0x021f4000
+
+/*
+ * IMX6Q_UART_BASE_ADDR is put in the middle to force the expansion
+ * of IMX6Q_UART##n##_BASE_ADDR.
+ */
+#define IMX6Q_UART_BASE_ADDR(n)	IMX6Q_UART##n##_BASE_ADDR
+#define IMX6Q_UART_BASE(n)	IMX6Q_UART_BASE_ADDR(n)
+#define IMX6Q_DEBUG_UART_BASE	IMX6Q_UART_BASE(CONFIG_DEBUG_IMX6Q_UART_PORT)
+
 static struct map_desc imx_lluart_desc = {
-#ifdef CONFIG_DEBUG_IMX6Q_UART2
-	.virtual	= MX6Q_IO_P2V(MX6Q_UART2_BASE_ADDR),
-	.pfn		= __phys_to_pfn(MX6Q_UART2_BASE_ADDR),
-	.length		= MX6Q_UART2_SIZE,
-	.type		= MT_DEVICE,
-#endif
-#ifdef CONFIG_DEBUG_IMX6Q_UART4
-	.virtual	= MX6Q_IO_P2V(MX6Q_UART4_BASE_ADDR),
-	.pfn		= __phys_to_pfn(MX6Q_UART4_BASE_ADDR),
-	.length		= MX6Q_UART4_SIZE,
+#ifdef CONFIG_DEBUG_IMX6Q_UART
+	.virtual	= IMX_IO_P2V(IMX6Q_DEBUG_UART_BASE),
+	.pfn		= __phys_to_pfn(IMX6Q_DEBUG_UART_BASE),
+	.length		= 0x4000,
 	.type		= MT_DEVICE,
 #endif
 };

arch/arm/mach-imx/mx6q.h

@@ -27,9 +27,5 @@
 #define MX6Q_CCM_SIZE			0x4000
 #define MX6Q_ANATOP_BASE_ADDR		0x020c8000
 #define MX6Q_ANATOP_SIZE		0x1000
-#define MX6Q_UART2_BASE_ADDR		0x021e8000
-#define MX6Q_UART2_SIZE			0x4000
-#define MX6Q_UART4_BASE_ADDR		0x021f0000
-#define MX6Q_UART4_SIZE			0x4000
 
 #endif	/* __MACH_MX6Q_H__ */