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[linux-ginger.git] / arch / sh / include / cpu-sh2 / cpu / watchdog.h
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1 /*
2 * include/asm-sh/cpu-sh2/watchdog.h
4 * Copyright (C) 2002, 2003 Paul Mundt
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10 #ifndef __ASM_CPU_SH2_WATCHDOG_H
11 #define __ASM_CPU_SH2_WATCHDOG_H
14 * More SH-2 brilliance .. its not good enough that we can't read
15 * and write the same sizes to WTCNT, now we have to read and write
16 * with different sizes at different addresses for WTCNT _and_ RSTCSR.
18 * At least on the bright side no one has managed to screw over WTCSR
19 * in this fashion .. yet.
21 /* Register definitions */
22 #define WTCNT 0xfffffe80
23 #define WTCSR 0xfffffe80
24 #define RSTCSR 0xfffffe82
26 #define WTCNT_R (WTCNT + 1)
27 #define RSTCSR_R (RSTCSR + 1)
29 /* Bit definitions */
30 #define WTCSR_IOVF 0x80
31 #define WTCSR_WT 0x40
32 #define WTCSR_TME 0x20
33 #define WTCSR_RSTS 0x00
35 #define RSTCSR_RSTS 0x20
37 /**
38 * sh_wdt_read_rstcsr - Read from Reset Control/Status Register
40 * Reads back the RSTCSR value.
42 static inline __u8 sh_wdt_read_rstcsr(void)
45 * Same read/write brain-damage as for WTCNT here..
47 return ctrl_inb(RSTCSR_R);
50 /**
51 * sh_wdt_write_csr - Write to Reset Control/Status Register
53 * @val: Value to write
55 * Writes the given value @val to the lower byte of the control/status
56 * register. The upper byte is set manually on each write.
58 static inline void sh_wdt_write_rstcsr(__u8 val)
61 * Note: Due to the brain-damaged nature of this register,
62 * we can't presently touch the WOVF bit, since the upper byte
63 * has to be swapped for this. So just leave it alone..
65 ctrl_outw((WTCNT_HIGH << 8) | (__u16)val, RSTCSR);
68 #endif /* __ASM_CPU_SH2_WATCHDOG_H */