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MIPS: boot: Fixes for compressed/uart-16550.c

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Fix uart-16550.c for adding XLR/XLP support, changes are:
* Make register read/write use volatile pointers
* Support 32 bit IO read/write
* Increase timeout in waiting for UART LSR

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5416/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Jayachandran C 2013-06-10 06:33:25 +00:00 committed by Ralf Baechle
parent 5649d37c2b
commit d6a5078459
1 changed files with 7 additions and 3 deletions
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10
arch/mips/boot/compressed/uart-16550.c
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@ -23,23 +23,27 @@
#define PORT(offset) (UART0_BASE + (4 * offset)) #define PORT(offset) (UART0_BASE + (4 * offset))
#endif #endif
#ifndef IOTYPE
#define IOTYPE char
#endif
#ifndef PORT #ifndef PORT
#error please define the serial port address for your own machine #error please define the serial port address for your own machine
#endif #endif
static inline unsigned int serial_in(int offset) static inline unsigned int serial_in(int offset)
{ {
return *((char *)PORT(offset)); return *((volatile IOTYPE *)PORT(offset)) & 0xFF;
} }
static inline void serial_out(int offset, int value) static inline void serial_out(int offset, int value)
{ {
*((char *)PORT(offset)) = value; *((volatile IOTYPE *)PORT(offset)) = value & 0xFF;
} }
void putc(char c) void putc(char c)
{ {
int timeout = 1024; int timeout = 1000000;
while (((serial_in(UART_LSR) & UART_LSR_THRE) == 0) && (timeout-- > 0)) while (((serial_in(UART_LSR) & UART_LSR_THRE) == 0) && (timeout-- > 0))
; ;