ARM: imx: imx27: Introduce and use UART_BASE_ADDR(n)

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>

diff --git a/arch/arm/include/asm/arch-mx27/imx-regs.h b/arch/arm/include/asm/arch-mx27/imx-regs.h
index d39f6b0..77794d7 100644 (file)
--- a/arch/arm/include/asm/arch-mx27/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx27/imx-regs.h
@@ -179,16 +179,16 @@ struct fuse_bank0_regs {
 #define IMX_TIM2_BASE          (0x04000 + IMX_IO_BASE)
 #define IMX_TIM3_BASE          (0x05000 + IMX_IO_BASE)
 #define IMX_RTC_BASE           (0x07000 + IMX_IO_BASE)
-#define UART1_BASE             (0x0a000 + IMX_IO_BASE)
-#define UART2_BASE             (0x0b000 + IMX_IO_BASE)
-#define UART3_BASE             (0x0c000 + IMX_IO_BASE)
-#define UART4_BASE             (0x0d000 + IMX_IO_BASE)
+#define UART1_BASE_ADDR                (0x0a000 + IMX_IO_BASE)
+#define UART2_BASE_ADDR                (0x0b000 + IMX_IO_BASE)
+#define UART3_BASE_ADDR                (0x0c000 + IMX_IO_BASE)
+#define UART4_BASE_ADDR                (0x0d000 + IMX_IO_BASE)
 #define I2C1_BASE_ADDR         (0x12000 + IMX_IO_BASE)
 #define IMX_GPIO_BASE          (0x15000 + IMX_IO_BASE)
 #define IMX_TIM4_BASE          (0x19000 + IMX_IO_BASE)
 #define IMX_TIM5_BASE          (0x1a000 + IMX_IO_BASE)
-#define IMX_UART5_BASE         (0x1b000 + IMX_IO_BASE)
-#define IMX_UART6_BASE         (0x1c000 + IMX_IO_BASE)
+#define UART5_BASE_ADDR                (0x1b000 + IMX_IO_BASE)
+#define UART6_BASE_ADDR                (0x1c000 + IMX_IO_BASE)
 #define I2C2_BASE_ADDR         (0x1D000 + IMX_IO_BASE)
 #define IMX_TIM6_BASE          (0x1f000 + IMX_IO_BASE)
 #define IMX_AIPI2_BASE         (0x20000 + IMX_IO_BASE)
@@ -204,6 +204,18 @@ struct fuse_bank0_regs {
 
 #define NFC_BASE_ADDR          IMX_NFC_BASE
 
+#define UART_BASE_ADDR(n)      (                       \
+       !!sizeof(struct {                               \
+               static_assert((n) >= 1 && (n) <= 6);    \
+               int pad;                                \
+               }) * (                                  \
+       (n) == 1 ? UART1_BASE_ADDR :                    \
+       (n) == 2 ? UART2_BASE_ADDR :                    \
+       (n) == 3 ? UART3_BASE_ADDR :                    \
+       (n) == 4 ? UART4_BASE_ADDR :                    \
+       (n) == 5 ? UART5_BASE_ADDR :                    \
+       UART6_BASE_ADDR)                                \
+       )
 
 /* FMCR System Control bit definition*/
 #define UART4_RXD_CTL  (1 << 25)

diff --git a/include/configs/imx27lite-common.h b/include/configs/imx27lite-common.h
index bb53a33..6790053 100644 (file)
--- a/include/configs/imx27lite-common.h
+++ b/include/configs/imx27lite-common.h
@@ -70,7 +70,7 @@
 /*
  * Serial Driver info
  */
-#define CONFIG_MXC_UART_BASE   UART1_BASE
+#define CONFIG_MXC_UART_BASE   UART_BASE_ADDR(1)
 
 /*
  * Flash & Environment