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ARM: imx: imx31: Introduce and use UART_BASE_ADDR(n)

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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>
This commit is contained in:
Marek Vasut 2022-04-24 23:44:05 +02:00 committed by Stefano Babic
parent be23774ed1
commit c329f9349b
1 changed files with 12 additions and 0 deletions
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12
arch/arm/include/asm/arch-mx31/imx-regs.h
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@ -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