msm: zinc: Add low-level debugging UART support

Add the I/O map definitions and Kconfig options needed to
enable low-level debugging support (through earlyprintk)
on the MSMZINC platform.

Change-Id: Iacacc96f1a0d49314085a87ee3cc0905c09ebe9b
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>

arch/arm/mach-msm/Kconfig

@@ -1216,6 +1216,14 @@ choice
                 help
                   Say Y here if you want the debug print routines to direct
                   their output to the serial port on MPQ8092 devices.
+
+	config DEBUG_MSMZINC_UART
+                bool "Kernel low-level debugging messages via MSMZINC UART"
+                depends on ARCH_MSMZINC
+                select MSM_HAS_DEBUG_UART_HS_V14
+                help
+                  Say Y here if you want the debug print routines to direct
+                  their output to the serial port on MSMZINC devices.
 endchoice
 
 choice

arch/arm/mach-msm/include/mach/msm_iomap-zinc.h

@@ -37,4 +37,9 @@
 #define MSMZINC_IMEM_PHYS       0xFC42B000
 #define MSMZINC_IMEM_SIZE       SZ_4K
 
+#ifdef CONFIG_DEBUG_MSMZINC_UART
+#define MSM_DEBUG_UART_BASE	IOMEM(0xFA71E000)
+#define MSM_DEBUG_UART_PHYS	0xF991E000
+#endif
+
 #endif

arch/arm/mach-msm/io.c

@@ -340,6 +340,9 @@ static struct map_desc msm_zinc_io_desc[] __initdata = {
 		.length =   MSM_SHARED_RAM_SIZE,
 		.type =     MT_DEVICE,
 	},
+#ifdef CONFIG_DEBUG_MSMZINC_UART
+	MSM_DEVICE(DEBUG_UART),
+#endif
 };
 
 void __init msm_map_zinc_io(void)