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 extern u64 clock_comparator_max; 19 20 /* Inline functions for clock register access. */ 21 static inline int set_tod_clock(__u64 time) 22 { 23 int cc; 24 25 asm volatile( 26 " sck %1\n" 27 " ipm %0\n" 28 " srl %0,28\n" 29 : "=d" (cc) : "Q" (time) : "cc"); 30 return cc; 31 } 32 33 static inline int store_tod_clock(__u64 *time) 34 { 35 int cc; 36 37 asm volatile( 38 " stck %1\n" 39 " ipm %0\n" 40 " srl %0,28\n" 41 : "=d" (cc), "=Q" (*time) : : "cc"); 42 return cc; 43 } 44 45 static inline void set_clock_comparator(__u64 time) 46 { 47 asm volatile("sckc %0" : : "Q" (time)); 48 } 49 50 static inline void store_clock_comparator(__u64 *time) 51 { 52 asm volatile("stckc %0" : "=Q" (*time)); 53 } 54 55 void clock_comparator_work(void); 56 57 void __init time_early_init(void); 58 59 extern unsigned char ptff_function_mask[16]; 60 61 /* Function codes for the ptff instruction. */ 62 #define PTFF_QAF 0x00 /* query available functions */ 63 #define PTFF_QTO 0x01 /* query tod offset */ 64 #define PTFF_QSI 0x02 /* query steering information */ 65 #define PTFF_QUI 0x04 /* query UTC information */ 66 #define PTFF_ATO 0x40 /* adjust tod offset */ 67 #define PTFF_STO 0x41 /* set tod offset */ 68 #define PTFF_SFS 0x42 /* set fine steering rate */ 69 #define PTFF_SGS 0x43 /* set gross steering rate */ 70 71 /* Query TOD offset result */ 72 struct ptff_qto { 73 unsigned long long physical_clock; 74 unsigned long long tod_offset; 75 unsigned long long logical_tod_offset; 76 unsigned long long tod_epoch_difference; 77 } __packed; 78 79 static inline int ptff_query(unsigned int nr) 80 { 81 unsigned char *ptr; 82 83 ptr = ptff_function_mask + (nr >> 3); 84 return (*ptr & (0x80 >> (nr & 7))) != 0; 85 } 86 87 /* Query UTC information result */ 88 struct ptff_qui { 89 unsigned int tm : 2; 90 unsigned int ts : 2; 91 unsigned int : 28; 92 unsigned int pad_0x04; 93 unsigned long leap_event; 94 short old_leap; 95 short new_leap; 96 unsigned int pad_0x14; 97 unsigned long prt[5]; 98 unsigned long cst[3]; 99 unsigned int skew; 100 unsigned int pad_0x5c[41]; 101 } __packed; 102 103 /* 104 * ptff - Perform timing facility function 105 * @ptff_block: Pointer to ptff parameter block 106 * @len: Length of parameter block 107 * @func: Function code 108 * Returns: Condition code (0 on success) 109 */ 110 #define ptff(ptff_block, len, func) \ 111 ({ \ 112 struct addrtype { char _[len]; }; \ 113 register unsigned int reg0 asm("0") = func; \ 114 register unsigned long reg1 asm("1") = (unsigned long) (ptff_block);\ 115 int rc; \ 116 \ 117 asm volatile( \ 118 " .word 0x0104\n" \ 119 " ipm %0\n" \ 120 " srl %0,28\n" \ 121 : "=d" (rc), "+m" (*(struct addrtype *) reg1) \ 122 : "d" (reg0), "d" (reg1) : "cc"); \ 123 rc; \ 124 }) 125 126 static inline unsigned long long local_tick_disable(void) 127 { 128 unsigned long long old; 129 130 old = S390_lowcore.clock_comparator; 131 S390_lowcore.clock_comparator = clock_comparator_max; 132 set_clock_comparator(S390_lowcore.clock_comparator); 133 return old; 134 } 135 136 static inline void local_tick_enable(unsigned long long comp) 137 { 138 S390_lowcore.clock_comparator = comp; 139 set_clock_comparator(S390_lowcore.clock_comparator); 140 } 141 142 #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */ 143 #define STORE_CLOCK_EXT_SIZE 16 /* stcke writes 16 bytes */ 144 145 typedef unsigned long long cycles_t; 146 147 static inline void get_tod_clock_ext(char *clk) 148 { 149 typedef struct { char _[STORE_CLOCK_EXT_SIZE]; } addrtype; 150 151 asm volatile("stcke %0" : "=Q" (*(addrtype *) clk) : : "cc"); 152 } 153 154 static inline unsigned long long get_tod_clock(void) 155 { 156 unsigned char clk[STORE_CLOCK_EXT_SIZE]; 157 158 get_tod_clock_ext(clk); 159 return *((unsigned long long *)&clk[1]); 160 } 161 162 static inline unsigned long long get_tod_clock_fast(void) 163 { 164 #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES 165 unsigned long long clk; 166 167 asm volatile("stckf %0" : "=Q" (clk) : : "cc"); 168 return clk; 169 #else 170 return get_tod_clock(); 171 #endif 172 } 173 174 static inline cycles_t get_cycles(void) 175 { 176 return (cycles_t) get_tod_clock() >> 2; 177 } 178 179 int get_phys_clock(unsigned long *clock); 180 void init_cpu_timer(void); 181 unsigned long long monotonic_clock(void); 182 183 extern unsigned char tod_clock_base[16] __aligned(8); 184 185 /** 186 * get_clock_monotonic - returns current time in clock rate units 187 * 188 * The caller must ensure that preemption is disabled. 189 * The clock and tod_clock_base get changed via stop_machine. 190 * Therefore preemption must be disabled when calling this 191 * function, otherwise the returned value is not guaranteed to 192 * be monotonic. 193 */ 194 static inline unsigned long long get_tod_clock_monotonic(void) 195 { 196 return get_tod_clock() - *(unsigned long long *) &tod_clock_base[1]; 197 } 198 199 /** 200 * tod_to_ns - convert a TOD format value to nanoseconds 201 * @todval: to be converted TOD format value 202 * Returns: number of nanoseconds that correspond to the TOD format value 203 * 204 * Converting a 64 Bit TOD format value to nanoseconds means that the value 205 * must be divided by 4.096. In order to achieve that we multiply with 125 206 * and divide by 512: 207 * 208 * ns = (todval * 125) >> 9; 209 * 210 * In order to avoid an overflow with the multiplication we can rewrite this. 211 * With a split todval == 2^9 * th + tl (th upper 55 bits, tl lower 9 bits) 212 * we end up with 213 * 214 * ns = ((2^9 * th + tl) * 125 ) >> 9; 215 * -> ns = (th * 125) + ((tl * 125) >> 9); 216 * 217 */ 218 static inline unsigned long long tod_to_ns(unsigned long long todval) 219 { 220 return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9); 221 } 222 223 /** 224 * tod_after - compare two 64 bit TOD values 225 * @a: first 64 bit TOD timestamp 226 * @b: second 64 bit TOD timestamp 227 * 228 * Returns: true if a is later than b 229 */ 230 static inline int tod_after(unsigned long long a, unsigned long long b) 231 { 232 if (MACHINE_HAS_SCC) 233 return (long long) a > (long long) b; 234 return a > b; 235 } 236 237 /** 238 * tod_after_eq - compare two 64 bit TOD values 239 * @a: first 64 bit TOD timestamp 240 * @b: second 64 bit TOD timestamp 241 * 242 * Returns: true if a is later than b 243 */ 244 static inline int tod_after_eq(unsigned long long a, unsigned long long b) 245 { 246 if (MACHINE_HAS_SCC) 247 return (long long) a >= (long long) b; 248 return a >= b; 249 } 250 251 #endif 252