1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Copyright IBM Corp. 1999
6 * Derived from "include/asm-i386/timex.h"
7 * Copyright (C) 1992, Linus Torvalds
10 #ifndef _ASM_S390_TIMEX_H
11 #define _ASM_S390_TIMEX_H
13 #include <linux/preempt.h>
14 #include <linux/time64.h>
15 #include <asm/lowcore.h>
17 /* The value of the TOD clock for 1.1.1970. */
18 #define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
20 #define STORE_CLOCK_EXT_SIZE 16 /* stcke writes 16 bytes */
22 extern u64 clock_comparator_max;
27 __uint128_t ei : 8; /* epoch index */
28 __uint128_t tod : 64; /* bits 0-63 of tod clock */
30 __uint128_t pf : 16; /* programmable field */
33 __uint128_t eitod : 72; /* epoch index + bits 0-63 tod clock */
37 __uint128_t us : 60; /* micro-seconds */
38 __uint128_t sus : 12; /* sub-microseconds */
43 /* Inline functions for clock register access. */
44 static inline int set_tod_clock(__u64 time)
52 : "=d" (cc) : "Q" (time) : "cc");
56 static inline int store_tod_clock_ext_cc(union tod_clock *clk)
64 : "=d" (cc), "=Q" (*clk) : : "cc");
68 static inline void store_tod_clock_ext(union tod_clock *tod)
70 asm volatile("stcke %0" : "=Q" (*tod) : : "cc");
73 static inline void set_clock_comparator(__u64 time)
75 asm volatile("sckc %0" : : "Q" (time));
78 static inline void set_tod_programmable_field(u16 val)
80 register unsigned long reg0 asm("0") = val;
82 asm volatile("sckpf" : : "d" (reg0));
85 void clock_comparator_work(void);
87 void __init time_early_init(void);
89 extern unsigned char ptff_function_mask[16];
91 /* Function codes for the ptff instruction. */
92 #define PTFF_QAF 0x00 /* query available functions */
93 #define PTFF_QTO 0x01 /* query tod offset */
94 #define PTFF_QSI 0x02 /* query steering information */
95 #define PTFF_QUI 0x04 /* query UTC information */
96 #define PTFF_ATO 0x40 /* adjust tod offset */
97 #define PTFF_STO 0x41 /* set tod offset */
98 #define PTFF_SFS 0x42 /* set fine steering rate */
99 #define PTFF_SGS 0x43 /* set gross steering rate */
101 /* Query TOD offset result */
103 unsigned long long physical_clock;
104 unsigned long long tod_offset;
105 unsigned long long logical_tod_offset;
106 unsigned long long tod_epoch_difference;
109 static inline int ptff_query(unsigned int nr)
113 ptr = ptff_function_mask + (nr >> 3);
114 return (*ptr & (0x80 >> (nr & 7))) != 0;
117 /* Query UTC information result */
122 unsigned int pad_0x04;
123 unsigned long leap_event;
126 unsigned int pad_0x14;
127 unsigned long prt[5];
128 unsigned long cst[3];
130 unsigned int pad_0x5c[41];
134 * ptff - Perform timing facility function
135 * @ptff_block: Pointer to ptff parameter block
136 * @len: Length of parameter block
137 * @func: Function code
138 * Returns: Condition code (0 on success)
140 #define ptff(ptff_block, len, func) \
142 struct addrtype { char _[len]; }; \
143 register unsigned int reg0 asm("0") = func; \
144 register unsigned long reg1 asm("1") = (unsigned long) (ptff_block);\
151 : "=d" (rc), "+m" (*(struct addrtype *) reg1) \
152 : "d" (reg0), "d" (reg1) : "cc"); \
156 static inline unsigned long long local_tick_disable(void)
158 unsigned long long old;
160 old = S390_lowcore.clock_comparator;
161 S390_lowcore.clock_comparator = clock_comparator_max;
162 set_clock_comparator(S390_lowcore.clock_comparator);
166 static inline void local_tick_enable(unsigned long long comp)
168 S390_lowcore.clock_comparator = comp;
169 set_clock_comparator(S390_lowcore.clock_comparator);
172 #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
174 typedef unsigned long long cycles_t;
176 static inline void get_tod_clock_ext(char *clk)
178 typedef struct { char _[STORE_CLOCK_EXT_SIZE]; } addrtype;
180 asm volatile("stcke %0" : "=Q" (*(addrtype *) clk) : : "cc");
183 static inline unsigned long long get_tod_clock(void)
185 char clk[STORE_CLOCK_EXT_SIZE];
187 get_tod_clock_ext(clk);
188 return *((unsigned long long *)&clk[1]);
191 static inline unsigned long long get_tod_clock_fast(void)
193 #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
194 unsigned long long clk;
196 asm volatile("stckf %0" : "=Q" (clk) : : "cc");
199 return get_tod_clock();
203 static inline cycles_t get_cycles(void)
205 return (cycles_t) get_tod_clock() >> 2;
208 int get_phys_clock(unsigned long *clock);
209 void init_cpu_timer(void);
211 extern union tod_clock tod_clock_base;
214 * get_clock_monotonic - returns current time in clock rate units
216 * The clock and tod_clock_base get changed via stop_machine.
217 * Therefore preemption must be disabled, otherwise the returned
218 * value is not guaranteed to be monotonic.
220 static inline unsigned long long get_tod_clock_monotonic(void)
222 unsigned long long tod;
224 preempt_disable_notrace();
225 tod = get_tod_clock() - tod_clock_base.tod;
226 preempt_enable_notrace();
231 * tod_to_ns - convert a TOD format value to nanoseconds
232 * @todval: to be converted TOD format value
233 * Returns: number of nanoseconds that correspond to the TOD format value
235 * Converting a 64 Bit TOD format value to nanoseconds means that the value
236 * must be divided by 4.096. In order to achieve that we multiply with 125
239 * ns = (todval * 125) >> 9;
241 * In order to avoid an overflow with the multiplication we can rewrite this.
242 * With a split todval == 2^9 * th + tl (th upper 55 bits, tl lower 9 bits)
245 * ns = ((2^9 * th + tl) * 125 ) >> 9;
246 * -> ns = (th * 125) + ((tl * 125) >> 9);
249 static inline unsigned long long tod_to_ns(unsigned long long todval)
251 return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9);
255 * tod_after - compare two 64 bit TOD values
256 * @a: first 64 bit TOD timestamp
257 * @b: second 64 bit TOD timestamp
259 * Returns: true if a is later than b
261 static inline int tod_after(unsigned long long a, unsigned long long b)
264 return (long long) a > (long long) b;
269 * tod_after_eq - compare two 64 bit TOD values
270 * @a: first 64 bit TOD timestamp
271 * @b: second 64 bit TOD timestamp
273 * Returns: true if a is later than b
275 static inline int tod_after_eq(unsigned long long a, unsigned long long b)
278 return (long long) a >= (long long) b;