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author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2010-03-01 10:55:20 +0300 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2010-03-01 10:55:20 +0300 |
commit | 35858adbfca13678af99fb31618ef4428d6dedb0 (patch) | |
tree | 3336feaa61324486945816cb52c347733e7c0821 /arch/mips/boot/compressed/uart-16550.c | |
parent | 197d4db752e67160d79fed09968c2140376a80a3 (diff) | |
parent | 4b70858ba8d4537daf782defebe5f2ff80ccef2b (diff) | |
download | linux-35858adbfca13678af99fb31618ef4428d6dedb0.tar.xz |
Merge branch 'next' into for-linus
Diffstat (limited to 'arch/mips/boot/compressed/uart-16550.c')
-rw-r--r-- | arch/mips/boot/compressed/uart-16550.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/mips/boot/compressed/uart-16550.c b/arch/mips/boot/compressed/uart-16550.c new file mode 100644 index 000000000000..c9caaf4fbf60 --- /dev/null +++ b/arch/mips/boot/compressed/uart-16550.c @@ -0,0 +1,43 @@ +/* + * 16550 compatible uart based serial debug support for zboot + */ + +#include <linux/types.h> +#include <linux/serial_reg.h> +#include <linux/init.h> + +#include <asm/addrspace.h> + +#if defined(CONFIG_MACH_LOONGSON) || defined(CONFIG_MIPS_MALTA) +#define UART_BASE 0x1fd003f8 +#define PORT(offset) (CKSEG1ADDR(UART_BASE) + (offset)) +#endif + +#ifdef CONFIG_AR7 +#include <ar7.h> +#define PORT(offset) (CKSEG1ADDR(AR7_REGS_UART0) + (4 * offset)) +#endif + +#ifndef PORT +#error please define the serial port address for your own machine +#endif + +static inline unsigned int serial_in(int offset) +{ + return *((char *)PORT(offset)); +} + +static inline void serial_out(int offset, int value) +{ + *((char *)PORT(offset)) = value; +} + +void putc(char c) +{ + int timeout = 1024; + + while (((serial_in(UART_LSR) & UART_LSR_THRE) == 0) && (timeout-- > 0)) + ; + + serial_out(UART_TX, c); +} |