1 /* 2 * S390 version 3 * Copyright IBM Corp. 1999 4 * 5 * Derived from "include/asm-i386/timex.h" 6 * Copyright (C) 1992, Linus Torvalds 7 */ 8 9 #ifndef _ASM_S390_TIMEX_H 10 #define _ASM_S390_TIMEX_H 11 12 #include <asm/lowcore.h> 13 #include <linux/time64.h> 14 15 /* The value of the TOD clock for 1.1.1970. */ 16 #define TOD_UNIX_EPOCH 0x7d91048bca000000ULL 17 18 /* Inline functions for clock register access. */ 19 static inline int set_tod_clock(__u64 time) 20 { 21 int cc; 22 23 asm volatile( 24 " sck %1\n" 25 " ipm %0\n" 26 " srl %0,28\n" 27 : "=d" (cc) : "Q" (time) : "cc"); 28 return cc; 29 } 30 31 static inline int store_tod_clock(__u64 *time) 32 { 33 int cc; 34 35 asm volatile( 36 " stck %1\n" 37 " ipm %0\n" 38 " srl %0,28\n" 39 : "=d" (cc), "=Q" (*time) : : "cc"); 40 return cc; 41 } 42 43 static inline void set_clock_comparator(__u64 time) 44 { 45 asm volatile("sckc %0" : : "Q" (time)); 46 } 47 48 static inline void store_clock_comparator(__u64 *time) 49 { 50 asm volatile("stckc %0" : "=Q" (*time)); 51 } 52 53 void clock_comparator_work(void); 54 55 void __init time_early_init(void); 56 57 extern unsigned char ptff_function_mask[16]; 58 59 /* Function codes for the ptff instruction. */ 60 #define PTFF_QAF 0x00 /* query available functions */ 61 #define PTFF_QTO 0x01 /* query tod offset */ 62 #define PTFF_QSI 0x02 /* query steering information */ 63 #define PTFF_QUI 0x04 /* query UTC information */ 64 #define PTFF_ATO 0x40 /* adjust tod offset */ 65 #define PTFF_STO 0x41 /* set tod offset */ 66 #define PTFF_SFS 0x42 /* set fine steering rate */ 67 #define PTFF_SGS 0x43 /* set gross steering rate */ 68 69 /* Query TOD offset result */ 70 struct ptff_qto { 71 unsigned long long physical_clock; 72 unsigned long long tod_offset; 73 unsigned long long logical_tod_offset; 74 unsigned long long tod_epoch_difference; 75 } __packed; 76 77 static inline int ptff_query(unsigned int nr) 78 { 79 unsigned char *ptr; 80 81 ptr = ptff_function_mask + (nr >> 3); 82 return (*ptr & (0x80 >> (nr & 7))) != 0; 83 } 84 85 /* Query UTC information result */ 86 struct ptff_qui { 87 unsigned int tm : 2; 88 unsigned int ts : 2; 89 unsigned int : 28; 90 unsigned int pad_0x04; 91 unsigned long leap_event; 92 short old_leap; 93 short new_leap; 94 unsigned int pad_0x14; 95 unsigned long prt[5]; 96 unsigned long cst[3]; 97 unsigned int skew; 98 unsigned int pad_0x5c[41]; 99 } __packed; 100 101 /* 102 * ptff - Perform timing facility function 103 * @ptff_block: Pointer to ptff parameter block 104 * @len: Length of parameter block 105 * @func: Function code 106 * Returns: Condition code (0 on success) 107 */ 108 #define ptff(ptff_block, len, func) \ 109 ({ \ 110 struct addrtype { char _[len]; }; \ 111 register unsigned int reg0 asm("0") = func; \ 112 register unsigned long reg1 asm("1") = (unsigned long) (ptff_block);\ 113 int rc; \ 114 \ 115 asm volatile( \ 116 " .word 0x0104\n" \ 117 " ipm %0\n" \ 118 " srl %0,28\n" \ 119 : "=d" (rc), "+m" (*(struct addrtype *) reg1) \ 120 : "d" (reg0), "d" (reg1) : "cc"); \ 121 rc; \ 122 }) 123 124 static inline unsigned long long local_tick_disable(void) 125 { 126 unsigned long long old; 127 128 old = S390_lowcore.clock_comparator; 129 S390_lowcore.clock_comparator = -1ULL; 130 set_clock_comparator(S390_lowcore.clock_comparator); 131 return old; 132 } 133 134 static inline void local_tick_enable(unsigned long long comp) 135 { 136 S390_lowcore.clock_comparator = comp; 137 set_clock_comparator(S390_lowcore.clock_comparator); 138 } 139 140 #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */ 141 #define STORE_CLOCK_EXT_SIZE 16 /* stcke writes 16 bytes */ 142 143 typedef unsigned long long cycles_t; 144 145 static inline void get_tod_clock_ext(char *clk) 146 { 147 typedef struct { char _[STORE_CLOCK_EXT_SIZE]; } addrtype; 148 149 asm volatile("stcke %0" : "=Q" (*(addrtype *) clk) : : "cc"); 150 } 151 152 static inline unsigned long long get_tod_clock(void) 153 { 154 unsigned char clk[STORE_CLOCK_EXT_SIZE]; 155 156 get_tod_clock_ext(clk); 157 return *((unsigned long long *)&clk[1]); 158 } 159 160 static inline unsigned long long get_tod_clock_fast(void) 161 { 162 #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES 163 unsigned long long clk; 164 165 asm volatile("stckf %0" : "=Q" (clk) : : "cc"); 166 return clk; 167 #else 168 return get_tod_clock(); 169 #endif 170 } 171 172 static inline cycles_t get_cycles(void) 173 { 174 return (cycles_t) get_tod_clock() >> 2; 175 } 176 177 int get_phys_clock(unsigned long long *clock); 178 void init_cpu_timer(void); 179 unsigned long long monotonic_clock(void); 180 181 extern u64 sched_clock_base_cc; 182 183 /** 184 * get_clock_monotonic - returns current time in clock rate units 185 * 186 * The caller must ensure that preemption is disabled. 187 * The clock and sched_clock_base get changed via stop_machine. 188 * Therefore preemption must be disabled when calling this 189 * function, otherwise the returned value is not guaranteed to 190 * be monotonic. 191 */ 192 static inline unsigned long long get_tod_clock_monotonic(void) 193 { 194 return get_tod_clock() - sched_clock_base_cc; 195 } 196 197 /** 198 * tod_to_ns - convert a TOD format value to nanoseconds 199 * @todval: to be converted TOD format value 200 * Returns: number of nanoseconds that correspond to the TOD format value 201 * 202 * Converting a 64 Bit TOD format value to nanoseconds means that the value 203 * must be divided by 4.096. In order to achieve that we multiply with 125 204 * and divide by 512: 205 * 206 * ns = (todval * 125) >> 9; 207 * 208 * In order to avoid an overflow with the multiplication we can rewrite this. 209 * With a split todval == 2^9 * th + tl (th upper 55 bits, tl lower 9 bits) 210 * we end up with 211 * 212 * ns = ((2^9 * th + tl) * 125 ) >> 9; 213 * -> ns = (th * 125) + ((tl * 125) >> 9); 214 * 215 */ 216 static inline unsigned long long tod_to_ns(unsigned long long todval) 217 { 218 return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9); 219 } 220 221 #endif 222