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 <ma...@denx.de>
Cc: Fabio Estevam <feste...@denx.de>
Cc: Peng Fan <peng....@nxp.com>
Cc: Stefano Babic <sba...@denx.de>
---
arch/arm/include/asm/arch-mx31/imx-regs.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/arch/arm/include/asm/arch-mx31/imx-regs.h
b/arch/arm/include/asm/arch-mx31/imx-regs.h
index 566db549ec6..d5c0ed8e6c2 100644
--- a/arch/arm/include/asm/arch-mx31/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx31/imx-regs.h
@@ -598,6 +598,18 @@ struct esdc_regs {
#define UART4_BASE 0x43FB0000
#define UART5_BASE 0x43FB4000
+#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 : \
+ UART5_BASE_ADDR) \
+ )
+
#define I2C1_BASE_ADDR 0x43f80000
#define I2C1_CLK_OFFSET 26
#define I2C2_BASE_ADDR 0x43F98000
--
2.35.1
