[PATCH v3] ARM: zynq: Allow UART1 to be used as DEBUG_LL console.

The main UART on the Xilinx ZC702 board is UART1, located at address
e0001000.  Add a Kconfig option to select this device as the low-level
debugging port.  This allows the really early boot printouts to reach
the USB serial adaptor on this board.

For consistency's sake, add a choice entry for UART0 even though it is
the the default if UART1 is not selected.

Signed-off-by: Nick Bowler <redacted>
Tested-by: Josh Cartwright <redacted>
---
Sorry all for the phenominal delay in sending this out.  Josh, I kept
your Tested-By since this version is Obviously Equivalent? to v2...

v2: rebase on newest patch series, signoff.
v3: squash in style tweaks suggested by Michal Simek.

 arch/arm/Kconfig.debug                     |   17 +++++++++++++++++
 arch/arm/mach-zynq/common.c                |    6 +++---
 arch/arm/mach-zynq/include/mach/zynq_soc.h |   16 +++++++++++-----
 3 files changed, 31 insertions(+), 8 deletions(-)

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index b0f3857b3a4c..7754d51f2b19 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug

@@ -132,6 +132,23 @@ choice
 		  their output to UART1 serial port on DaVinci TNETV107X
 		  devices.
 
+	config DEBUG_ZYNQ_UART0
+		bool "Kernel low-level debugging on Xilinx Zynq using UART0"
+		depends on ARCH_ZYNQ
+		help
+		  Say Y here if you want the debug print routines to direct
+		  their output to UART0 on the Zynq platform.
+
+	config DEBUG_ZYNQ_UART1
+		bool "Kernel low-level debugging on Xilinx Zynq using UART1"
+		depends on ARCH_ZYNQ
+		help
+		  Say Y here if you want the debug print routines to direct
+		  their output to UART1 on the Zynq platform.
+
+		  If you have a ZC702 board and want early boot messages to
+		  appear on the USB serial adaptor, select this option.
+
 	config DEBUG_DC21285_PORT
 		bool "Kernel low-level debugging messages via footbridge serial port"
 		depends on FOOTBRIDGE

diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c
index ba8d14f78d4d..93b91059faab 100644
--- a/arch/arm/mach-zynq/common.c
+++ b/arch/arm/mach-zynq/common.c

@@ -84,9 +84,9 @@ static struct map_desc io_desc[] __initdata = {
 
 #ifdef CONFIG_DEBUG_LL
 	{
-		.virtual	= UART0_VIRT,
-		.pfn		= __phys_to_pfn(UART0_PHYS),
-		.length		= UART0_SIZE,
+		.virtual	= LL_UART_VADDR,
+		.pfn		= __phys_to_pfn(LL_UART_PADDR),
+		.length		= UART_SIZE,
 		.type		= MT_DEVICE,
 	},
 #endif

diff --git a/arch/arm/mach-zynq/include/mach/zynq_soc.h b/arch/arm/mach-zynq/include/mach/zynq_soc.h
index 1b8bf0ecbcb0..5ebbd8e6eeee 100644
--- a/arch/arm/mach-zynq/include/mach/zynq_soc.h
+++ b/arch/arm/mach-zynq/include/mach/zynq_soc.h

@@ -25,8 +25,9 @@
  * address that is known to work.
  */
 #define UART0_PHYS		0xE0000000
-#define UART0_SIZE		SZ_4K
-#define UART0_VIRT		0xF0001000
+#define UART1_PHYS		0xE0001000
+#define UART_SIZE		SZ_4K
+#define UART_VIRT		0xF0001000
 
 #define TTC0_PHYS		0xF8001000
 #define TTC0_SIZE		SZ_4K

@@ -36,12 +37,17 @@
 #define SCU_PERIPH_SIZE		SZ_8K
 #define SCU_PERIPH_VIRT		(TTC0_VIRT - SCU_PERIPH_SIZE)
 
+#if IS_ENABLED(CONFIG_DEBUG_ZYNQ_UART1)
+# define LL_UART_PADDR		UART1_PHYS
+#else
+# define LL_UART_PADDR		UART0_PHYS
+#endif
+
+#define LL_UART_VADDR		UART_VIRT
+
 /* The following are intended for the devices that are mapped early */
 
 #define TTC0_BASE			IOMEM(TTC0_VIRT)
 #define SCU_PERIPH_BASE			IOMEM(SCU_PERIPH_VIRT)
 
-#define LL_UART_PADDR	UART0_PHYS
-#define LL_UART_VADDR	UART0_VIRT
-
 #endif

-- 
1.7.8.6

On Mon, Nov 05, 2012 at 04:45:49PM -0500, Nick Bowler wrote:

The main UART on the Xilinx ZC702 board is UART1, located at address
e0001000.  Add a Kconfig option to select this device as the low-level
debugging port.  This allows the really early boot printouts to reach
the USB serial adaptor on this board.

For consistency's sake, add a choice entry for UART0 even though it is
the the default if UART1 is not selected.

Signed-off-by: Nick Bowler <redacted>
Tested-by: Josh Cartwright <redacted>
---
Sorry all for the phenominal delay in sending this out.  Josh, I kept
your Tested-By since this version is Obviously Equivalent??? to v2...

I re-tested again just in case and everything is good.

Thanks,
  Josh
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2012/11/5 Josh Cartwright [off-list ref]:

On Mon, Nov 05, 2012 at 04:45:49PM -0500, Nick Bowler wrote:

quoted

The main UART on the Xilinx ZC702 board is UART1, located at address
e0001000.  Add a Kconfig option to select this device as the low-level
debugging port.  This allows the really early boot printouts to reach
the USB serial adaptor on this board.

For consistency's sake, add a choice entry for UART0 even though it is
the the default if UART1 is not selected.

Signed-off-by: Nick Bowler <redacted>
Tested-by: Josh Cartwright <redacted>
---
Sorry all for the phenominal delay in sending this out.  Josh, I kept
your Tested-By since this version is Obviously Equivalent??? to v2...

I re-tested again just in case and everything is good.

Thanks guys, Applied.

Michal