[U-Boot] [PATCH] serial: ns16550: fix different reg size access

[Lei Wen <leiwen@marvell.com>]

Some hardware would dysfunctional if only access the register by
byte. This patch is tend to recover original access the responding
register according to CONFIG_SYS_NS16550_REG_SIZE.

Signed-off-by: Lei Wen <leiwen@marvell.com>
---
 README                   |    5 ++++
 drivers/serial/ns16550.c |    7 ------
 include/ns16550.h        |   51 +++++++++++++++++++++++++++++++++++++--------
 3 files changed, 47 insertions(+), 16 deletions(-)

diff --git a/README b/README
index 21cd71b..45bc7dd 100644
--- a/README
+++ b/README
@@ -2660,6 +2660,11 @@ use the "saveenv" command to store a valid environment.
 		space for already greatly restricted images, including but not
 		limited to NAND_SPL configurations.
 
+- CONFIG_SYS_NS16550_MAX_REG_SIZE:
+		Define the ns16550 max register size,
+		if the CONFIG_SYS_NS16550_REG_SIZE is smaller than this value,
+		use padding to fill those gap.
+
 Low Level (hardware related) configuration options:
 ---------------------------------------------------
 
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 8eeb48f..4956c7f 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -16,13 +16,6 @@
 #define UART_FCRVAL (UART_FCR_FIFO_EN |	\
 		     UART_FCR_RXSR |	\
 		     UART_FCR_TXSR)		/* Clear & enable FIFOs */
-#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
-#define serial_out(x,y)	outb(x,(ulong)y)
-#define serial_in(y)	inb((ulong)y)
-#else
-#define serial_out(x,y) writeb(x,y)
-#define serial_in(y) 	readb(y)
-#endif
 
 #ifndef CONFIG_SYS_NS16550_IER
 #define CONFIG_SYS_NS16550_IER  0x00
diff --git a/include/ns16550.h b/include/ns16550.h
index 9ea81e9..a51b6e6 100644
--- a/include/ns16550.h
+++ b/include/ns16550.h
@@ -20,17 +20,50 @@
  * Note that the following macro magic uses the fact that the compiler
  * will not allocate storage for arrays of size 0
  */
-
-#if !defined(CONFIG_SYS_NS16550_REG_SIZE) || (CONFIG_SYS_NS16550_REG_SIZE == 0)
+#if (CONFIG_SYS_NS16550_REG_SIZE == 4) || (CONFIG_SYS_NS16550_REG_SIZE == -4)
+#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
+#define serial_out(x, y)	outl(x, y)
+#define serial_in(y)		inl(y)
+#else
+#define serial_out(x, y)	writel(x, y)
+#define serial_in(y)		readl(y)
+#endif
+#define UART_REG_TYPE		unsigned int
+#elif (CONFIG_SYS_NS16550_REG_SIZE == 2) || (CONFIG_SYS_NS16550_REG_SIZE == -2)
+#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
+#define serial_out(x, y)	outw(x, y)
+#define serial_in(y)		inw(y)
+#else
+#define serial_out(x, y)	writew(x, y)
+#define serial_in(y)		readw(y)
+#endif
+#define UART_REG_TYPE		unsigned short
+#elif (CONFIG_SYS_NS16550_REG_SIZE == 1) || (CONFIG_SYS_NS16550_REG_SIZE == -1)
+#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
+#define serial_out(x, y)	outb(x, y)
+#define serial_in(y)		inb(y)
+#else
+#define serial_out(x, y)	writeb(x, y)
+#define serial_in(y)		readb(y)
+#endif
+#define UART_REG_TYPE		unsigned char
+#else
 #error "Please define NS16550 registers size."
-#elif (CONFIG_SYS_NS16550_REG_SIZE > 0)
-#define UART_REG(x)						   \
-	unsigned char prepad_##x[CONFIG_SYS_NS16550_REG_SIZE - 1]; \
-	unsigned char x;
-#elif (CONFIG_SYS_NS16550_REG_SIZE < 0)
+#endif
+
+#ifndef CONFIG_SYS_NS16550_MAX_REG_SIZE
+#define CONFIG_SYS_NS16550_MAX_REG_SIZE 4
+#endif
+#if (CONFIG_SYS_NS16550_REG_SIZE > 0)
+#define UART_REG(x)							\
+	unsigned char prepad_##x[CONFIG_SYS_NS16550_MAX_REG_SIZE	\
+				- CONFIG_SYS_NS16550_REG_SIZE];		\
+	UART_REG_TYPE x;
+#else
 #define UART_REG(x)							\
-	unsigned char x;						\
-	unsigned char postpad_##x[-CONFIG_SYS_NS16550_REG_SIZE - 1];
+	UART_REG_TYPE x;						\
+	unsigned char prepad_##x[CONFIG_SYS_NS16550_MAX_REG_SIZE	\
+				+ CONFIG_SYS_NS16550_REG_SIZE];
 #endif
 
 struct NS16550 {
-- 
1.7.0.4