[linux-2.6-block.git] / arch / s390 / include / asm / timex.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  S390 version
 *    Copyright IBM Corp. 1999
 *
 *  Derived from "include/asm-i386/timex.h"
 *    Copyright (C) 1992, Linus Torvalds
 */

#ifndef _ASM_S390_TIMEX_H
#define _ASM_S390_TIMEX_H

#include <linux/preempt.h>
#include <linux/time64.h>
#include <asm/lowcore.h>

/* The value of the TOD clock for 1.1.1970. */
#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL

extern u64 clock_comparator_max;

/* Inline functions for clock register access. */
static inline int set_tod_clock(__u64 time)
{
	int cc;

	asm volatile(
		"   sck   %1\n"
		"   ipm   %0\n"
		"   srl   %0,28\n"
		: "=d" (cc) : "Q" (time) : "cc");
	return cc;
}

static inline int store_tod_clock(__u64 *time)
{
	int cc;

	asm volatile(
		"   stck  %1\n"
		"   ipm   %0\n"
		"   srl   %0,28\n"
		: "=d" (cc), "=Q" (*time) : : "cc");
	return cc;
}

static inline void set_clock_comparator(__u64 time)
{
	asm volatile("sckc %0" : : "Q" (time));
}

static inline void store_clock_comparator(__u64 *time)
{
	asm volatile("stckc %0" : "=Q" (*time));
}

void clock_comparator_work(void);

void __init time_early_init(void);

extern unsigned char ptff_function_mask[16];

/* Function codes for the ptff instruction. */
#define PTFF_QAF	0x00	/* query available functions */
#define PTFF_QTO	0x01	/* query tod offset */
#define PTFF_QSI	0x02	/* query steering information */
#define PTFF_QUI	0x04	/* query UTC information */
#define PTFF_ATO	0x40	/* adjust tod offset */
#define PTFF_STO	0x41	/* set tod offset */
#define PTFF_SFS	0x42	/* set fine steering rate */
#define PTFF_SGS	0x43	/* set gross steering rate */

/* Query TOD offset result */
struct ptff_qto {
	unsigned long long physical_clock;
	unsigned long long tod_offset;
	unsigned long long logical_tod_offset;
	unsigned long long tod_epoch_difference;
} __packed;

static inline int ptff_query(unsigned int nr)
{
	unsigned char *ptr;

	ptr = ptff_function_mask + (nr >> 3);
	return (*ptr & (0x80 >> (nr & 7))) != 0;
}

/* Query UTC information result */
struct ptff_qui {
	unsigned int tm : 2;
	unsigned int ts : 2;
	unsigned int : 28;
	unsigned int pad_0x04;
	unsigned long leap_event;
	short old_leap;
	short new_leap;
	unsigned int pad_0x14;
	unsigned long prt[5];
	unsigned long cst[3];
	unsigned int skew;
	unsigned int pad_0x5c[41];
} __packed;

/*
 * ptff - Perform timing facility function
 * @ptff_block: Pointer to ptff parameter block
 * @len: Length of parameter block
 * @func: Function code
 * Returns: Condition code (0 on success)
 */
#define ptff(ptff_block, len, func)					\
({									\
	struct addrtype { char _[len]; };				\
	register unsigned int reg0 asm("0") = func;			\
	register unsigned long reg1 asm("1") = (unsigned long) (ptff_block);\
	int rc;								\
									\
	asm volatile(							\
		"	.word	0x0104\n"				\
		"	ipm	%0\n"					\
		"	srl	%0,28\n"				\
		: "=d" (rc), "+m" (*(struct addrtype *) reg1)		\
		: "d" (reg0), "d" (reg1) : "cc");			\
	rc;								\
})

static inline unsigned long long local_tick_disable(void)
{
	unsigned long long old;

	old = S390_lowcore.clock_comparator;
	S390_lowcore.clock_comparator = clock_comparator_max;
	set_clock_comparator(S390_lowcore.clock_comparator);
	return old;
}

static inline void local_tick_enable(unsigned long long comp)
{
	S390_lowcore.clock_comparator = comp;
	set_clock_comparator(S390_lowcore.clock_comparator);
}

#define CLOCK_TICK_RATE		1193180 /* Underlying HZ */
#define STORE_CLOCK_EXT_SIZE	16	/* stcke writes 16 bytes */

typedef unsigned long long cycles_t;

static inline void get_tod_clock_ext(char *clk)
{
	typedef struct { char _[STORE_CLOCK_EXT_SIZE]; } addrtype;

	asm volatile("stcke %0" : "=Q" (*(addrtype *) clk) : : "cc");
}

static inline unsigned long long get_tod_clock(void)
{
	unsigned char clk[STORE_CLOCK_EXT_SIZE];

	get_tod_clock_ext(clk);
	return *((unsigned long long *)&clk[1]);
}

static inline unsigned long long get_tod_clock_fast(void)
{
#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
	unsigned long long clk;

	asm volatile("stckf %0" : "=Q" (clk) : : "cc");
	return clk;
#else
	return get_tod_clock();
#endif
}

static inline cycles_t get_cycles(void)
{
	return (cycles_t) get_tod_clock() >> 2;
}

int get_phys_clock(unsigned long *clock);
void init_cpu_timer(void);

extern unsigned char tod_clock_base[16] __aligned(8);

/**
 * get_clock_monotonic - returns current time in clock rate units
 *
 * The clock and tod_clock_base get changed via stop_machine.
 * Therefore preemption must be disabled, otherwise the returned
 * value is not guaranteed to be monotonic.
 */
static inline unsigned long long get_tod_clock_monotonic(void)
{
	unsigned long long tod;

	preempt_disable();
	tod = get_tod_clock() - *(unsigned long long *) &tod_clock_base[1];
	preempt_enable();
	return tod;
}

/**
 * tod_to_ns - convert a TOD format value to nanoseconds
 * @todval: to be converted TOD format value
 * Returns: number of nanoseconds that correspond to the TOD format value
 *
 * Converting a 64 Bit TOD format value to nanoseconds means that the value
 * must be divided by 4.096. In order to achieve that we multiply with 125
 * and divide by 512:
 *
 *    ns = (todval * 125) >> 9;
 *
 * In order to avoid an overflow with the multiplication we can rewrite this.
 * With a split todval == 2^9 * th + tl (th upper 55 bits, tl lower 9 bits)
 * we end up with
 *
 *    ns = ((2^9 * th + tl) * 125 ) >> 9;
 * -> ns = (th * 125) + ((tl * 125) >> 9);
 *
 */
static inline unsigned long long tod_to_ns(unsigned long long todval)
{
	return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9);
}

/**
 * tod_after - compare two 64 bit TOD values
 * @a: first 64 bit TOD timestamp
 * @b: second 64 bit TOD timestamp
 *
 * Returns: true if a is later than b
 */
static inline int tod_after(unsigned long long a, unsigned long long b)
{
	if (MACHINE_HAS_SCC)
		return (long long) a > (long long) b;
	return a > b;
}

/**
 * tod_after_eq - compare two 64 bit TOD values
 * @a: first 64 bit TOD timestamp
 * @b: second 64 bit TOD timestamp
 *
 * Returns: true if a is later than b
 */
static inline int tod_after_eq(unsigned long long a, unsigned long long b)
{
	if (MACHINE_HAS_SCC)
		return (long long) a >= (long long) b;
	return a >= b;
}

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4	2	/*
1da177e4	3	* S390 version
a53c8fab	4	* Copyright IBM Corp. 1999
1da177e4 LT	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
01162068	13	#include <linux/preempt.h>
689911c7	14	#include <linux/time64.h>
01162068	15	#include <asm/lowcore.h>
17eb7a5c	16
b6112ccb MS	17	/* The value of the TOD clock for 1.1.1970. */
	18	#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
	19
6e2ef5e4 MS	20	extern u64 clock_comparator_max;
6e2ef5e4 MS	21
d54853ef	22	/* Inline functions for clock register access. */
1aae0560	23	static inline int set_tod_clock(__u64 time)
d54853ef MS	24	{
	25	int cc;
	26
	27	asm volatile(
987bcdac	28	" sck %1\n"
d54853ef MS	29	" ipm %0\n"
d54853ef MS	30	" srl %0,28\n"
987bcdac	31	: "=d" (cc) : "Q" (time) : "cc");
d54853ef MS	32	return cc;
	33	}
	34
1aae0560	35	static inline int store_tod_clock(__u64 *time)
d54853ef MS	36	{
	37	int cc;
	38
	39	asm volatile(
987bcdac	40	" stck %1\n"
d54853ef MS	41	" ipm %0\n"
d54853ef MS	42	" srl %0,28\n"
987bcdac	43	: "=d" (cc), "=Q" (*time) : : "cc");
d54853ef MS	44	return cc;
	45	}
	46
	47	static inline void set_clock_comparator(__u64 time)
	48	{
987bcdac	49	asm volatile("sckc %0" : : "Q" (time));
d54853ef MS	50	}
	51
	52	static inline void store_clock_comparator(__u64 *time)
	53	{
987bcdac	54	asm volatile("stckc %0" : "=Q" (*time));
d54853ef MS	55	}
d54853ef MS	56
17eb7a5c HC	57	void clock_comparator_work(void);
17eb7a5c HC	58
b1c0854d	59	void __init time_early_init(void);
40277891 MS	60
40277891 MS	61	extern unsigned char ptff_function_mask[16];
40277891	62
9dc06ccf MS	63	/* Function codes for the ptff instruction. */
	64	#define PTFF_QAF 0x00 /* query available functions */
	65	#define PTFF_QTO 0x01 /* query tod offset */
	66	#define PTFF_QSI 0x02 /* query steering information */
936cc855	67	#define PTFF_QUI 0x04 /* query UTC information */
9dc06ccf MS	68	#define PTFF_ATO 0x40 /* adjust tod offset */
	69	#define PTFF_STO 0x41 /* set tod offset */
	70	#define PTFF_SFS 0x42 /* set fine steering rate */
	71	#define PTFF_SGS 0x43 /* set gross steering rate */
	72
	73	/* Query TOD offset result */
	74	struct ptff_qto {
	75	unsigned long long physical_clock;
	76	unsigned long long tod_offset;
	77	unsigned long long logical_tod_offset;
	78	unsigned long long tod_epoch_difference;
	79	} __packed;
	80
40277891 MS	81	static inline int ptff_query(unsigned int nr)
	82	{
	83	unsigned char *ptr;
	84
	85	ptr = ptff_function_mask + (nr >> 3);
	86	return (*ptr & (0x80 >> (nr & 7))) != 0;
	87	}
	88
936cc855 MS	89	/* Query UTC information result */
	90	struct ptff_qui {
	91	unsigned int tm : 2;
	92	unsigned int ts : 2;
	93	unsigned int : 28;
	94	unsigned int pad_0x04;
	95	unsigned long leap_event;
	96	short old_leap;
	97	short new_leap;
	98	unsigned int pad_0x14;
	99	unsigned long prt[5];
	100	unsigned long cst[3];
	101	unsigned int skew;
	102	unsigned int pad_0x5c[41];
	103	} __packed;
	104
11a247e3 MH	105	/*
	106	* ptff - Perform timing facility function
	107	* @ptff_block: Pointer to ptff parameter block
	108	* @len: Length of parameter block
	109	* @func: Function code
	110	* Returns: Condition code (0 on success)
	111	*/
	112	#define ptff(ptff_block, len, func) \
	113	({ \
	114	struct addrtype { char _[len]; }; \
	115	register unsigned int reg0 asm("0") = func; \
	116	register unsigned long reg1 asm("1") = (unsigned long) (ptff_block);\
	117	int rc; \
	118	\
	119	asm volatile( \
	120	" .word 0x0104\n" \
	121	" ipm %0\n" \
	122	" srl %0,28\n" \
	123	: "=d" (rc), "+m" ((struct addrtype ) reg1) \
	124	: "d" (reg0), "d" (reg1) : "cc"); \
	125	rc; \
	126	})
9dc06ccf	127
17eb7a5c HC	128	static inline unsigned long long local_tick_disable(void)
	129	{
	130	unsigned long long old;
	131
	132	old = S390_lowcore.clock_comparator;
6e2ef5e4	133	S390_lowcore.clock_comparator = clock_comparator_max;
545b288d	134	set_clock_comparator(S390_lowcore.clock_comparator);
17eb7a5c HC	135	return old;
	136	}
	137
	138	static inline void local_tick_enable(unsigned long long comp)
	139	{
	140	S390_lowcore.clock_comparator = comp;
545b288d	141	set_clock_comparator(S390_lowcore.clock_comparator);
17eb7a5c HC	142	}
17eb7a5c HC	143
e38f9781 CG	144	#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
e38f9781 CG	145	#define STORE_CLOCK_EXT_SIZE 16 /* stcke writes 16 bytes */
1da177e4 LT	146
	147	typedef unsigned long long cycles_t;
	148
e38f9781	149	static inline void get_tod_clock_ext(char *clk)
57b28f66	150	{
e38f9781	151	typedef struct { char _[STORE_CLOCK_EXT_SIZE]; } addrtype;
7ab64a85 MS	152
7ab64a85 MS	153	asm volatile("stcke %0" : "=Q" ((addrtype ) clk) : : "cc");
57b28f66 MH	154	}
57b28f66 MH	155
8c071b0f	156	static inline unsigned long long get_tod_clock(void)
1b278294	157	{
e38f9781 CG	158	unsigned char clk[STORE_CLOCK_EXT_SIZE];
e38f9781 CG	159
1aae0560	160	get_tod_clock_ext(clk);
c0015f91	161	return ((unsigned long long )&clk[1]);
1b278294 JG	162	}
1b278294 JG	163
8c071b0f MS	164	static inline unsigned long long get_tod_clock_fast(void)
	165	{
	166	#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
	167	unsigned long long clk;
	168
	169	asm volatile("stckf %0" : "=Q" (clk) : : "cc");
	170	return clk;
	171	#else
	172	return get_tod_clock();
	173	#endif
	174	}
	175
94c12cc7 MS	176	static inline cycles_t get_cycles(void)
94c12cc7 MS	177	{
1aae0560	178	return (cycles_t) get_tod_clock() >> 2;
94c12cc7 MS	179	}
94c12cc7 MS	180
7bf76f01	181	int get_phys_clock(unsigned long *clock);
2b67fc46 HC	182	void init_cpu_timer(void);
2b67fc46 HC	183
6e2ef5e4	184	extern unsigned char tod_clock_base[16] __aligned(8);
b6112ccb	185
05e7ff7d HC	186	/**
	187	* get_clock_monotonic - returns current time in clock rate units
	188	*
6e2ef5e4	189	* The clock and tod_clock_base get changed via stop_machine.
01162068 HC	190	* Therefore preemption must be disabled, otherwise the returned
01162068 HC	191	* value is not guaranteed to be monotonic.
05e7ff7d	192	*/
1aae0560	193	static inline unsigned long long get_tod_clock_monotonic(void)
05e7ff7d	194	{
01162068 HC	195	unsigned long long tod;
	196
	197	preempt_disable();
	198	tod = get_tod_clock() - (unsigned long long ) &tod_clock_base[1];
	199	preempt_enable();
	200	return tod;
05e7ff7d HC	201	}
05e7ff7d HC	202
ed4f2094 HC	203	/**
	204	* tod_to_ns - convert a TOD format value to nanoseconds
	205	* @todval: to be converted TOD format value
	206	* Returns: number of nanoseconds that correspond to the TOD format value
	207	*
	208	* Converting a 64 Bit TOD format value to nanoseconds means that the value
	209	* must be divided by 4.096. In order to achieve that we multiply with 125
	210	* and divide by 512:
	211	*
	212	* ns = (todval * 125) >> 9;
	213	*
	214	* In order to avoid an overflow with the multiplication we can rewrite this.
d03bd045	215	* With a split todval == 2^9 * th + tl (th upper 55 bits, tl lower 9 bits)
ed4f2094 HC	216	* we end up with
ed4f2094 HC	217	*
d03bd045 MS	218	* ns = ((2^9 * th + tl) * 125 ) >> 9;
d03bd045 MS	219	* -> ns = (th * 125) + ((tl * 125) >> 9);
ed4f2094 HC	220	*
	221	*/
	222	static inline unsigned long long tod_to_ns(unsigned long long todval)
	223	{
d03bd045	224	return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9);
ed4f2094 HC	225	}
ed4f2094 HC	226
6e2ef5e4 MS	227	/**
	228	* tod_after - compare two 64 bit TOD values
	229	* @a: first 64 bit TOD timestamp
	230	* @b: second 64 bit TOD timestamp
	231	*
	232	* Returns: true if a is later than b
	233	*/
	234	static inline int tod_after(unsigned long long a, unsigned long long b)
	235	{
	236	if (MACHINE_HAS_SCC)
	237	return (long long) a > (long long) b;
	238	return a > b;
	239	}
	240
	241	/**
	242	* tod_after_eq - compare two 64 bit TOD values
	243	* @a: first 64 bit TOD timestamp
	244	* @b: second 64 bit TOD timestamp
	245	*
	246	* Returns: true if a is later than b
	247	*/
	248	static inline int tod_after_eq(unsigned long long a, unsigned long long b)
	249	{
	250	if (MACHINE_HAS_SCC)
	251	return (long long) a >= (long long) b;
	252	return a >= b;
	253	}
	254
1da177e4	255	#endif