[PATCH 4/4] ARM: imx: imx5: Introduce and use UART_BASE_ADDR(n)

[Marek Vasut <marex@denx.de>]

Introduce helper macro UART_BASE_ADDR(n), which returns Nth UART base
address. Convert all board configurations to this new macro. This is the
first step toward switching CONFIG_MXC_UART_BASE to Kconfig. This is a
clean up, no functional change.

The new macro contains compile-time test to verify N is in suitable
range. The test works such that it multiplies constant N by constant
double-negation of size of a non-empty structure, i.e. it multiplies
constant N by constant 1 in each successful compilation case.

The non-empty structure may contain C11 _Static_assert(), make use of
this and place the kernel variant of static assert in there, so that
it performs the compile-time check for N in the correct range. Note
that it is not possible to directly use static_assert in compound
statements, hence this convoluted construct.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@denx.de>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
---
 arch/arm/include/asm/arch-mx5/imx-regs.h | 23 +++++++++++++++++++++++
 include/configs/mx51evk.h                |  2 +-
 include/configs/mx53cx9020.h             |  2 +-
 include/configs/mx53loco.h               |  2 +-
 include/configs/usbarmory.h              |  2 +-
 5 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/arch/arm/include/asm/arch-mx5/imx-regs.h b/arch/arm/include/asm/arch-mx5/imx-regs.h
index f763749b03c..856bc07e8ae 100644
--- a/arch/arm/include/asm/arch-mx5/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx5/imx-regs.h
@@ -125,6 +125,29 @@
 
 #if defined(CONFIG_MX53)
 #define UART5_BASE_ADDR         (AIPS2_BASE_ADDR + 0x00090000)
+
+#define UART_BASE_ADDR(n)	(			\
+	!!sizeof(struct {				\
+		static_assert((n) >= 1 && (n) <= 5);	\
+		int pad;				\
+		}) * (					\
+	(n) == 1 ? UART1_BASE :				\
+	(n) == 2 ? UART2_BASE :				\
+	(n) == 3 ? UART3_BASE :				\
+	(n) == 4 ? UART4_BASE_ADDR :			\
+	UART5_BASE_ADDR)				\
+	)
+#else	/* i.MX51 */
+#define UART_BASE_ADDR(n)	(			\
+	!!sizeof(struct {				\
+		static_assert((n) >= 1 && (n) <= 4);	\
+		int pad;				\
+		}) * (					\
+	(n) == 1 ? UART1_BASE :				\
+	(n) == 2 ? UART2_BASE :				\
+	(n) == 3 ? UART3_BASE :				\
+	UART4_BASE_ADDR)				\
+	)
 #endif
 
 /*
diff --git a/include/configs/mx51evk.h b/include/configs/mx51evk.h
index ccfe292f6c6..814202e48d0 100644
--- a/include/configs/mx51evk.h
+++ b/include/configs/mx51evk.h
@@ -19,7 +19,7 @@
  */
 #define CONFIG_FSL_IIM
 
-#define CONFIG_MXC_UART_BASE	UART1_BASE
+#define CONFIG_MXC_UART_BASE	UART_BASE_ADDR(1)
 
 /* PMIC Controller */
 #define CONFIG_POWER_SPI
diff --git a/include/configs/mx53cx9020.h b/include/configs/mx53cx9020.h
index fafc5f1adcb..9f2259d2981 100644
--- a/include/configs/mx53cx9020.h
+++ b/include/configs/mx53cx9020.h
@@ -14,7 +14,7 @@
 
 #include <asm/arch/imx-regs.h>
 
-#define CONFIG_MXC_UART_BASE UART2_BASE
+#define CONFIG_MXC_UART_BASE UART_BASE_ADDR(2)
 
 #define CONFIG_FPGA_COUNT 1
 
diff --git a/include/configs/mx53loco.h b/include/configs/mx53loco.h
index 8b9f0a29017..9851f64ee9f 100644
--- a/include/configs/mx53loco.h
+++ b/include/configs/mx53loco.h
@@ -11,7 +11,7 @@
 
 #include <asm/arch/imx-regs.h>
 
-#define CONFIG_MXC_UART_BASE	UART1_BASE
+#define CONFIG_MXC_UART_BASE	UART_BASE_ADDR(1)
 
 /* MMC Configs */
 #define CONFIG_SYS_FSL_ESDHC_ADDR	0
diff --git a/include/configs/usbarmory.h b/include/configs/usbarmory.h
index 0faa656bc63..98b289e7ff1 100644
--- a/include/configs/usbarmory.h
+++ b/include/configs/usbarmory.h
@@ -18,7 +18,7 @@
 #define CONFIG_SYS_CBSIZE	512
 
 /* UART */
-#define CONFIG_MXC_UART_BASE	UART1_BASE
+#define CONFIG_MXC_UART_BASE	UART_BASE_ADDR(1)
 
 /* SD/MMC */
 #define CONFIG_SYS_FSL_ESDHC_ADDR	0
-- 
2.35.1