1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * S390 version 4 * Copyright IBM Corp. 1999 5 * 6 * Derived from "include/asm-i386/timex.h" 7 * Copyright (C) 1992, Linus Torvalds 8 */ 9 10 #ifndef _ASM_S390_TIMEX_H 11 #define _ASM_S390_TIMEX_H 12 13 #include <linux/preempt.h> 14 #include <linux/time64.h> 15 #include <asm/lowcore.h> 16 17 /* The value of the TOD clock for 1.1.1970. */ 18 #define TOD_UNIX_EPOCH 0x7d91048bca000000ULL 19 20 extern u64 clock_comparator_max; 21 22 union tod_clock { 23 __uint128_t val; 24 struct { 25 __uint128_t ei : 8; /* epoch index */ 26 __uint128_t tod : 64; /* bits 0-63 of tod clock */ 27 __uint128_t : 40; 28 __uint128_t pf : 16; /* programmable field */ 29 }; 30 struct { 31 __uint128_t eitod : 72; /* epoch index + bits 0-63 tod clock */ 32 __uint128_t : 56; 33 }; 34 struct { 35 __uint128_t us : 60; /* micro-seconds */ 36 __uint128_t sus : 12; /* sub-microseconds */ 37 __uint128_t : 56; 38 }; 39 } __packed; 40 41 /* Inline functions for clock register access. */ 42 static inline int set_tod_clock(__u64 time) 43 { 44 int cc; 45 46 asm volatile( 47 " sck %1\n" 48 " ipm %0\n" 49 " srl %0,28\n" 50 : "=d" (cc) : "Q" (time) : "cc"); 51 return cc; 52 } 53 54 static inline int store_tod_clock_ext_cc(union tod_clock *clk) 55 { 56 int cc; 57 58 asm volatile( 59 " stcke %1\n" 60 " ipm %0\n" 61 " srl %0,28\n" 62 : "=d" (cc), "=Q" (*clk) : : "cc"); 63 return cc; 64 } 65 66 static inline void store_tod_clock_ext(union tod_clock *tod) 67 { 68 asm volatile("stcke %0" : "=Q" (*tod) : : "cc"); 69 } 70 71 static inline void set_clock_comparator(__u64 time) 72 { 73 asm volatile("sckc %0" : : "Q" (time)); 74 } 75 76 static inline void set_tod_programmable_field(u16 val) 77 { 78 register unsigned long reg0 asm("0") = val; 79 80 asm volatile("sckpf" : : "d" (reg0)); 81 } 82 83 void clock_comparator_work(void); 84 85 void __init time_early_init(void); 86 87 extern unsigned char ptff_function_mask[16]; 88 89 /* Function codes for the ptff instruction. */ 90 #define PTFF_QAF 0x00 /* query available functions */ 91 #define PTFF_QTO 0x01 /* query tod offset */ 92 #define PTFF_QSI 0x02 /* query steering information */ 93 #define PTFF_QUI 0x04 /* query UTC information */ 94 #define PTFF_ATO 0x40 /* adjust tod offset */ 95 #define PTFF_STO 0x41 /* set tod offset */ 96 #define PTFF_SFS 0x42 /* set fine steering rate */ 97 #define PTFF_SGS 0x43 /* set gross steering rate */ 98 99 /* Query TOD offset result */ 100 struct ptff_qto { 101 unsigned long long physical_clock; 102 unsigned long long tod_offset; 103 unsigned long long logical_tod_offset; 104 unsigned long long tod_epoch_difference; 105 } __packed; 106 107 static inline int ptff_query(unsigned int nr) 108 { 109 unsigned char *ptr; 110 111 ptr = ptff_function_mask + (nr >> 3); 112 return (*ptr & (0x80 >> (nr & 7))) != 0; 113 } 114 115 /* Query UTC information result */ 116 struct ptff_qui { 117 unsigned int tm : 2; 118 unsigned int ts : 2; 119 unsigned int : 28; 120 unsigned int pad_0x04; 121 unsigned long leap_event; 122 short old_leap; 123 short new_leap; 124 unsigned int pad_0x14; 125 unsigned long prt[5]; 126 unsigned long cst[3]; 127 unsigned int skew; 128 unsigned int pad_0x5c[41]; 129 } __packed; 130 131 /* 132 * ptff - Perform timing facility function 133 * @ptff_block: Pointer to ptff parameter block 134 * @len: Length of parameter block 135 * @func: Function code 136 * Returns: Condition code (0 on success) 137 */ 138 #define ptff(ptff_block, len, func) \ 139 ({ \ 140 struct addrtype { char _[len]; }; \ 141 register unsigned int reg0 asm("0") = func; \ 142 register unsigned long reg1 asm("1") = (unsigned long) (ptff_block);\ 143 int rc; \ 144 \ 145 asm volatile( \ 146 " .word 0x0104\n" \ 147 " ipm %0\n" \ 148 " srl %0,28\n" \ 149 : "=d" (rc), "+m" (*(struct addrtype *) reg1) \ 150 : "d" (reg0), "d" (reg1) : "cc"); \ 151 rc; \ 152 }) 153 154 static inline unsigned long long local_tick_disable(void) 155 { 156 unsigned long long old; 157 158 old = S390_lowcore.clock_comparator; 159 S390_lowcore.clock_comparator = clock_comparator_max; 160 set_clock_comparator(S390_lowcore.clock_comparator); 161 return old; 162 } 163 164 static inline void local_tick_enable(unsigned long long comp) 165 { 166 S390_lowcore.clock_comparator = comp; 167 set_clock_comparator(S390_lowcore.clock_comparator); 168 } 169 170 #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */ 171 172 typedef unsigned long long cycles_t; 173 174 static inline unsigned long long get_tod_clock(void) 175 { 176 union tod_clock clk; 177 178 store_tod_clock_ext(&clk); 179 return clk.tod; 180 } 181 182 static inline unsigned long long get_tod_clock_fast(void) 183 { 184 #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES 185 unsigned long long clk; 186 187 asm volatile("stckf %0" : "=Q" (clk) : : "cc"); 188 return clk; 189 #else 190 return get_tod_clock(); 191 #endif 192 } 193 194 static inline cycles_t get_cycles(void) 195 { 196 return (cycles_t) get_tod_clock() >> 2; 197 } 198 199 int get_phys_clock(unsigned long *clock); 200 void init_cpu_timer(void); 201 202 extern union tod_clock tod_clock_base; 203 204 /** 205 * get_clock_monotonic - returns current time in clock rate units 206 * 207 * The clock and tod_clock_base get changed via stop_machine. 208 * Therefore preemption must be disabled, otherwise the returned 209 * value is not guaranteed to be monotonic. 210 */ 211 static inline unsigned long long get_tod_clock_monotonic(void) 212 { 213 unsigned long long tod; 214 215 preempt_disable_notrace(); 216 tod = get_tod_clock() - tod_clock_base.tod; 217 preempt_enable_notrace(); 218 return tod; 219 } 220 221 /** 222 * tod_to_ns - convert a TOD format value to nanoseconds 223 * @todval: to be converted TOD format value 224 * Returns: number of nanoseconds that correspond to the TOD format value 225 * 226 * Converting a 64 Bit TOD format value to nanoseconds means that the value 227 * must be divided by 4.096. In order to achieve that we multiply with 125 228 * and divide by 512: 229 * 230 * ns = (todval * 125) >> 9; 231 * 232 * In order to avoid an overflow with the multiplication we can rewrite this. 233 * With a split todval == 2^9 * th + tl (th upper 55 bits, tl lower 9 bits) 234 * we end up with 235 * 236 * ns = ((2^9 * th + tl) * 125 ) >> 9; 237 * -> ns = (th * 125) + ((tl * 125) >> 9); 238 * 239 */ 240 static inline unsigned long long tod_to_ns(unsigned long long todval) 241 { 242 return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9); 243 } 244 245 /** 246 * tod_after - compare two 64 bit TOD values 247 * @a: first 64 bit TOD timestamp 248 * @b: second 64 bit TOD timestamp 249 * 250 * Returns: true if a is later than b 251 */ 252 static inline int tod_after(unsigned long long a, unsigned long long b) 253 { 254 if (MACHINE_HAS_SCC) 255 return (long long) a > (long long) b; 256 return a > b; 257 } 258 259 /** 260 * tod_after_eq - compare two 64 bit TOD values 261 * @a: first 64 bit TOD timestamp 262 * @b: second 64 bit TOD timestamp 263 * 264 * Returns: true if a is later than b 265 */ 266 static inline int tod_after_eq(unsigned long long a, unsigned long long b) 267 { 268 if (MACHINE_HAS_SCC) 269 return (long long) a >= (long long) b; 270 return a >= b; 271 } 272 273 #endif 274