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 <fovs...@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
drivers/serial/ns16550.c | 6 ++++++
include/ns16550.h | 2 ++
2 files changed, 8 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..d4ffac9 100644
--- a/include/ns16550.h
+++ b/include/ns16550.h
@@ -23,6 +23,8 @@
#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) unsigned int 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
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