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 #include <asm/asm.h> 17 18 /* The value of the TOD clock for 1.1.1970. */ 19 #define TOD_UNIX_EPOCH 0x7d91048bca000000ULL 20 21 extern u64 clock_comparator_max; 22 23 union tod_clock { 24 __uint128_t val; 25 struct { 26 __uint128_t ei : 8; /* epoch index */ 27 __uint128_t tod : 64; /* bits 0-63 of tod clock */ 28 __uint128_t : 40; 29 __uint128_t pf : 16; /* programmable field */ 30 }; 31 struct { 32 __uint128_t eitod : 72; /* epoch index + bits 0-63 tod clock */ 33 __uint128_t : 56; 34 }; 35 struct { 36 __uint128_t us : 60; /* micro-seconds */ 37 __uint128_t sus : 12; /* sub-microseconds */ 38 __uint128_t : 56; 39 }; 40 } __packed; 41 42 /* Inline functions for clock register access. */ 43 static inline int set_tod_clock(__u64 time) 44 { 45 int cc; 46 47 asm volatile( 48 " sck %[time]\n" 49 CC_IPM(cc) 50 : CC_OUT(cc, cc) 51 : [time] "Q" (time) 52 : CC_CLOBBER); 53 return CC_TRANSFORM(cc); 54 } 55 56 static inline int store_tod_clock_ext_cc(union tod_clock *clk) 57 { 58 int cc; 59 60 asm volatile( 61 " stcke %[clk]\n" 62 CC_IPM(cc) 63 : CC_OUT(cc, cc), [clk] "=Q" (*clk) 64 : 65 : CC_CLOBBER); 66 return CC_TRANSFORM(cc); 67 } 68 69 static __always_inline void store_tod_clock_ext(union tod_clock *tod) 70 { 71 asm volatile("stcke %0" : "=Q" (*tod) : : "cc"); 72 } 73 74 static inline void set_clock_comparator(__u64 time) 75 { 76 asm volatile("sckc %0" : : "Q" (time)); 77 } 78 79 static inline void set_tod_programmable_field(u16 val) 80 { 81 asm volatile( 82 " lgr 0,%[val]\n" 83 " sckpf\n" 84 : 85 : [val] "d" ((unsigned long)val) 86 : "0"); 87 } 88 89 void clock_comparator_work(void); 90 91 void __init time_early_init(void); 92 93 extern unsigned char ptff_function_mask[16]; 94 95 /* Function codes for the ptff instruction. */ 96 #define PTFF_QAF 0x00 /* query available functions */ 97 #define PTFF_QTO 0x01 /* query tod offset */ 98 #define PTFF_QSI 0x02 /* query steering information */ 99 #define PTFF_QPT 0x03 /* query physical clock */ 100 #define PTFF_QUI 0x04 /* query UTC information */ 101 #define PTFF_ATO 0x40 /* adjust tod offset */ 102 #define PTFF_STO 0x41 /* set tod offset */ 103 #define PTFF_SFS 0x42 /* set fine steering rate */ 104 #define PTFF_SGS 0x43 /* set gross steering rate */ 105 106 /* Query TOD offset result */ 107 struct ptff_qto { 108 unsigned long physical_clock; 109 unsigned long tod_offset; 110 unsigned long logical_tod_offset; 111 unsigned long tod_epoch_difference; 112 } __packed; 113 114 static inline int ptff_query(unsigned int nr) 115 { 116 unsigned char *ptr; 117 118 ptr = ptff_function_mask + (nr >> 3); 119 return (*ptr & (0x80 >> (nr & 7))) != 0; 120 } 121 122 /* Query UTC information result */ 123 struct ptff_qui { 124 unsigned int tm : 2; 125 unsigned int ts : 2; 126 unsigned int : 28; 127 unsigned int pad_0x04; 128 unsigned long leap_event; 129 short old_leap; 130 short new_leap; 131 unsigned int pad_0x14; 132 unsigned long prt[5]; 133 unsigned long cst[3]; 134 unsigned int skew; 135 unsigned int pad_0x5c[41]; 136 } __packed; 137 138 /* 139 * ptff - Perform timing facility function 140 * @ptff_block: Pointer to ptff parameter block 141 * @len: Length of parameter block 142 * @func: Function code 143 * Returns: Condition code (0 on success) 144 */ 145 #define ptff(ptff_block, len, func) \ 146 ({ \ 147 struct addrtype { char _[len]; }; \ 148 unsigned int reg0 = func; \ 149 unsigned long reg1 = (unsigned long)(ptff_block); \ 150 int rc; \ 151 \ 152 asm volatile( \ 153 " lgr 0,%[reg0]\n" \ 154 " lgr 1,%[reg1]\n" \ 155 " ptff\n" \ 156 CC_IPM(rc) \ 157 : CC_OUT(rc, rc), "+m" (*(struct addrtype *)reg1) \ 158 : [reg0] "d" (reg0), [reg1] "d" (reg1) \ 159 : CC_CLOBBER_LIST("0", "1")); \ 160 CC_TRANSFORM(rc); \ 161 }) 162 163 static inline unsigned long local_tick_disable(void) 164 { 165 unsigned long old; 166 167 old = get_lowcore()->clock_comparator; 168 get_lowcore()->clock_comparator = clock_comparator_max; 169 set_clock_comparator(get_lowcore()->clock_comparator); 170 return old; 171 } 172 173 static inline void local_tick_enable(unsigned long comp) 174 { 175 get_lowcore()->clock_comparator = comp; 176 set_clock_comparator(get_lowcore()->clock_comparator); 177 } 178 179 #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */ 180 181 typedef unsigned long cycles_t; 182 183 static __always_inline unsigned long get_tod_clock(void) 184 { 185 union tod_clock clk; 186 187 store_tod_clock_ext(&clk); 188 return clk.tod; 189 } 190 191 static inline unsigned long get_tod_clock_fast(void) 192 { 193 unsigned long clk; 194 195 asm volatile("stckf %0" : "=Q" (clk) : : "cc"); 196 return clk; 197 } 198 199 static inline cycles_t get_cycles(void) 200 { 201 return (cycles_t) get_tod_clock() >> 2; 202 } 203 #define get_cycles get_cycles 204 205 int get_phys_clock(unsigned long *clock); 206 void init_cpu_timer(void); 207 208 extern union tod_clock tod_clock_base; 209 210 static __always_inline unsigned long __get_tod_clock_monotonic(void) 211 { 212 return get_tod_clock() - tod_clock_base.tod; 213 } 214 215 /** 216 * get_clock_monotonic - returns current time in clock rate units 217 * 218 * The clock and tod_clock_base get changed via stop_machine. 219 * Therefore preemption must be disabled, otherwise the returned 220 * value is not guaranteed to be monotonic. 221 */ 222 static inline unsigned long get_tod_clock_monotonic(void) 223 { 224 unsigned long tod; 225 226 preempt_disable_notrace(); 227 tod = __get_tod_clock_monotonic(); 228 preempt_enable_notrace(); 229 return tod; 230 } 231 232 /** 233 * tod_to_ns - convert a TOD format value to nanoseconds 234 * @todval: to be converted TOD format value 235 * Returns: number of nanoseconds that correspond to the TOD format value 236 * 237 * Converting a 64 Bit TOD format value to nanoseconds means that the value 238 * must be divided by 4.096. In order to achieve that we multiply with 125 239 * and divide by 512: 240 * 241 * ns = (todval * 125) >> 9; 242 * 243 * In order to avoid an overflow with the multiplication we can rewrite this. 244 * With a split todval == 2^9 * th + tl (th upper 55 bits, tl lower 9 bits) 245 * we end up with 246 * 247 * ns = ((2^9 * th + tl) * 125 ) >> 9; 248 * -> ns = (th * 125) + ((tl * 125) >> 9); 249 * 250 */ 251 static __always_inline unsigned long tod_to_ns(unsigned long todval) 252 { 253 return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9); 254 } 255 256 static __always_inline u128 eitod_to_ns(u128 todval) 257 { 258 return (todval * 125) >> 9; 259 } 260 261 /** 262 * tod_after - compare two 64 bit TOD values 263 * @a: first 64 bit TOD timestamp 264 * @b: second 64 bit TOD timestamp 265 * 266 * Returns: true if a is later than b 267 */ 268 static inline int tod_after(unsigned long a, unsigned long b) 269 { 270 if (MACHINE_HAS_SCC) 271 return (long) a > (long) b; 272 return a > b; 273 } 274 275 /** 276 * tod_after_eq - compare two 64 bit TOD values 277 * @a: first 64 bit TOD timestamp 278 * @b: second 64 bit TOD timestamp 279 * 280 * Returns: true if a is later than b 281 */ 282 static inline int tod_after_eq(unsigned long a, unsigned long b) 283 { 284 if (MACHINE_HAS_SCC) 285 return (long) a >= (long) b; 286 return a >= b; 287 } 288 289 #endif 290