1 /* 2 * include/asm-sh/watchdog.h 3 * 4 * Copyright (C) 2002, 2003 Paul Mundt 5 * Copyright (C) 2009 Siemens AG 6 * Copyright (C) 2009 Valentin Sitdikov 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 #ifndef __ASM_SH_WATCHDOG_H 14 #define __ASM_SH_WATCHDOG_H 15 #ifdef __KERNEL__ 16 17 #include <linux/types.h> 18 #include <linux/io.h> 19 20 #define WTCNT_HIGH 0x5a 21 #define WTCSR_HIGH 0xa5 22 23 #define WTCSR_CKS2 0x04 24 #define WTCSR_CKS1 0x02 25 #define WTCSR_CKS0 0x01 26 27 #include <cpu/watchdog.h> 28 29 /* 30 * See cpu-sh2/watchdog.h for explanation of this stupidity.. 31 */ 32 #ifndef WTCNT_R 33 # define WTCNT_R WTCNT 34 #endif 35 36 #ifndef WTCSR_R 37 # define WTCSR_R WTCSR 38 #endif 39 40 /* 41 * CKS0-2 supports a number of clock division ratios. At the time the watchdog 42 * is enabled, it defaults to a 41 usec overflow period .. we overload this to 43 * something a little more reasonable, and really can't deal with anything 44 * lower than WTCSR_CKS_1024, else we drop back into the usec range. 45 * 46 * Clock Division Ratio Overflow Period 47 * -------------------------------------------- 48 * 1/32 (initial value) 41 usecs 49 * 1/64 82 usecs 50 * 1/128 164 usecs 51 * 1/256 328 usecs 52 * 1/512 656 usecs 53 * 1/1024 1.31 msecs 54 * 1/2048 2.62 msecs 55 * 1/4096 5.25 msecs 56 */ 57 #define WTCSR_CKS_32 0x00 58 #define WTCSR_CKS_64 0x01 59 #define WTCSR_CKS_128 0x02 60 #define WTCSR_CKS_256 0x03 61 #define WTCSR_CKS_512 0x04 62 #define WTCSR_CKS_1024 0x05 63 #define WTCSR_CKS_2048 0x06 64 #define WTCSR_CKS_4096 0x07 65 66 #if defined(CONFIG_CPU_SUBTYPE_SH7785) || defined(CONFIG_CPU_SUBTYPE_SH7780) 67 /** 68 * sh_wdt_read_cnt - Read from Counter 69 * Reads back the WTCNT value. 70 */ 71 static inline __u32 sh_wdt_read_cnt(void) 72 { 73 return __raw_readl(WTCNT_R); 74 } 75 76 /** 77 * sh_wdt_write_cnt - Write to Counter 78 * @val: Value to write 79 * 80 * Writes the given value @val to the lower byte of the timer counter. 81 * The upper byte is set manually on each write. 82 */ 83 static inline void sh_wdt_write_cnt(__u32 val) 84 { 85 __raw_writel((WTCNT_HIGH << 24) | (__u32)val, WTCNT); 86 } 87 88 /** 89 * sh_wdt_write_bst - Write to Counter 90 * @val: Value to write 91 * 92 * Writes the given value @val to the lower byte of the timer counter. 93 * The upper byte is set manually on each write. 94 */ 95 static inline void sh_wdt_write_bst(__u32 val) 96 { 97 __raw_writel((WTBST_HIGH << 24) | (__u32)val, WTBST); 98 } 99 /** 100 * sh_wdt_read_csr - Read from Control/Status Register 101 * 102 * Reads back the WTCSR value. 103 */ 104 static inline __u32 sh_wdt_read_csr(void) 105 { 106 return __raw_readl(WTCSR_R); 107 } 108 109 /** 110 * sh_wdt_write_csr - Write to Control/Status Register 111 * @val: Value to write 112 * 113 * Writes the given value @val to the lower byte of the control/status 114 * register. The upper byte is set manually on each write. 115 */ 116 static inline void sh_wdt_write_csr(__u32 val) 117 { 118 __raw_writel((WTCSR_HIGH << 24) | (__u32)val, WTCSR); 119 } 120 #else 121 /** 122 * sh_wdt_read_cnt - Read from Counter 123 * Reads back the WTCNT value. 124 */ 125 static inline __u8 sh_wdt_read_cnt(void) 126 { 127 return __raw_readb(WTCNT_R); 128 } 129 130 /** 131 * sh_wdt_write_cnt - Write to Counter 132 * @val: Value to write 133 * 134 * Writes the given value @val to the lower byte of the timer counter. 135 * The upper byte is set manually on each write. 136 */ 137 static inline void sh_wdt_write_cnt(__u8 val) 138 { 139 __raw_writew((WTCNT_HIGH << 8) | (__u16)val, WTCNT); 140 } 141 142 /** 143 * sh_wdt_read_csr - Read from Control/Status Register 144 * 145 * Reads back the WTCSR value. 146 */ 147 static inline __u8 sh_wdt_read_csr(void) 148 { 149 return __raw_readb(WTCSR_R); 150 } 151 152 /** 153 * sh_wdt_write_csr - Write to Control/Status Register 154 * @val: Value to write 155 * 156 * Writes the given value @val to the lower byte of the control/status 157 * register. The upper byte is set manually on each write. 158 */ 159 static inline void sh_wdt_write_csr(__u8 val) 160 { 161 __raw_writew((WTCSR_HIGH << 8) | (__u16)val, WTCSR); 162 } 163 #endif /* CONFIG_CPU_SUBTYPE_SH7785 || CONFIG_CPU_SUBTYPE_SH7780 */ 164 #endif /* __KERNEL__ */ 165 #endif /* __ASM_SH_WATCHDOG_H */ 166