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 --- Changes for v2: - Add endian support

Changes for v3: - Use in_be32()/out_be32() and in_le32/out_le32() functions to provide endian support

Changes for v4: - use u32 instead of unsigned int in include/ns16550.h to remove any ambiguity about the register size

drivers/serial/ns16550.c | 6 ++++++ include/ns16550.h | 4 ++++ 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c index 8eeb48f..0174744 100644 --- a/drivers/serial/ns16550.c +++ b/drivers/serial/ns16550.c @@ -19,6 +19,12 @@ #ifdef CONFIG_SYS_NS16550_PORT_MAPPED #define serial_out(x,y) outb(x,(ulong)y) #define serial_in(y) inb((ulong)y) +#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE > 0) +#define serial_out(x,y) out_be32(y,x) +#define serial_in(y) in_be32(y) +#elif defined(CONFIG_SYS_NS16550_MEM32) && (CONFIG_SYS_NS16550_REG_SIZE < 0) +#define serial_out(x,y) out_le32(y,x) +#define serial_in(y) in_le32(y) #else #define serial_out(x,y) writeb(x,y) #define serial_in(y) readb(y) diff --git a/include/ns16550.h b/include/ns16550.h index 9ea81e9..51f1c17 100644 --- a/include/ns16550.h +++ b/include/ns16550.h @@ -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]; \ -- 1.7.3.4