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ns16550: change to allow 32 bit access to registers

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If CONFIG_SYS_NS16550_MEM32 is defined then 32 bit memory
mapped access will be used to read/write the uart registers.

This is especially useful for SoC devices that implement 16550
compatible uarts but that have peripheral access width constraints.

Signed-off-by: Dave Aldridge <fovsoft@gmail.com>
This commit is contained in:
Dave Aldridge
2011-09-01 22:47:14 +00:00
committed by Wolfgang Denk
parent b18eabfa5f
commit 79df1208ee
2 changed files with 10 additions and 0 deletions
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4
include/ns16550.h
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@@ -21,8 +21,12 @@
* will not allocate storage for arrays of size 0
*/
#include <linux/types.h>
#if !defined(CONFIG_SYS_NS16550_REG_SIZE) || (CONFIG_SYS_NS16550_REG_SIZE == 0)
#error "Please define NS16550 registers size."
#elif defined(CONFIG_SYS_NS16550_MEM32)
#define UART_REG(x) u32 x
#elif (CONFIG_SYS_NS16550_REG_SIZE > 0)
#define UART_REG(x) \
unsigned char prepad_##x[CONFIG_SYS_NS16550_REG_SIZE - 1]; \