1/* SPDX-License-Identifier: GPL-2.0 */
 2/* timer.h: System timer definitions for sun5.
 3 *
 4 * Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net)
 5 */
 6
 7#ifndef _SPARC64_TIMER_H
 8#define _SPARC64_TIMER_H
 9
10#include <linux/types.h>
11#include <linux/init.h>
12
13/* The most frequently accessed fields should be first,
14 * to fit into the same cacheline.
15 */
16struct sparc64_tick_ops {
17	unsigned long ticks_per_nsec_quotient;
18	unsigned long offset;
19	unsigned long long (*get_tick)(void);
20	int (*add_compare)(unsigned long);
21	unsigned long softint_mask;
22	void (*disable_irq)(void);
23
24	void (*init_tick)(void);
25	unsigned long (*add_tick)(unsigned long);
26	unsigned long (*get_frequency)(void);
27	unsigned long frequency;
28
29	char *name;
30};
31
32extern struct sparc64_tick_ops *tick_ops;
33
34unsigned long sparc64_get_clock_tick(unsigned int cpu);
35void setup_sparc64_timer(void);
36void __init time_init(void);
37
38#define TICK_PRIV_BIT		BIT(63)
39#define TICKCMP_IRQ_BIT		BIT(63)
40
41#define HBIRD_STICKCMP_ADDR	0x1fe0000f060UL
42#define HBIRD_STICK_ADDR	0x1fe0000f070UL
43
44#define GET_TICK_NINSTR		13
45struct get_tick_patch {
46	unsigned int	addr;
47	unsigned int	tick[GET_TICK_NINSTR];
48	unsigned int	stick[GET_TICK_NINSTR];
49};
50
51extern struct get_tick_patch __get_tick_patch;
52extern struct get_tick_patch __get_tick_patch_end;
53
54static inline unsigned long get_tick(void)
55{
56	unsigned long tick, tmp1, tmp2;
57
58	__asm__ __volatile__(
59	/* read hbtick 13 instructions */
60	"661:\n"
61	"	mov	0x1fe, %1\n"
62	"	sllx	%1, 0x20, %1\n"
63	"	sethi	%%hi(0xf000), %2\n"
64	"	or	%2, 0x70, %2\n"
65	"	or	%1, %2, %1\n"	/* %1 = HBIRD_STICK_ADDR */
66	"	add	%1, 8, %2\n"
67	"	ldxa	[%2]%3, %0\n"
68	"	ldxa	[%1]%3, %1\n"
69	"	ldxa	[%2]%3, %2\n"
70	"	sub	%2, %0, %0\n"	/* don't modify %xcc */
71	"	brnz,pn	%0, 661b\n"	/* restart to save one register */
72	"	 sllx	%2, 32, %2\n"
73	"	or	%2, %1, %0\n"
74	/* Common/not patched code */
75	"	sllx	%0, 1, %0\n"
76	"	srlx	%0, 1, %0\n"	/* Clear TICK_PRIV_BIT */
77	/* Beginning of patch section */
78	"	.section .get_tick_patch, \"ax\"\n"
79	"	.word	661b\n"
80	/* read tick 2 instructions and 11 skipped */
81	"	ba	1f\n"
82	"	 rd	%%tick, %0\n"
83	"	.skip	4 * (%4 - 2)\n"
84	"1:\n"
85	/* read stick 2 instructions and 11 skipped */
86	"	ba	1f\n"
87	"	 rd	%%asr24, %0\n"
88	"	.skip	4 * (%4 - 2)\n"
89	"1:\n"
90	/* End of patch section */
91	"	.previous\n"
92	: "=&r" (tick), "=&r" (tmp1), "=&r" (tmp2)
93	: "i" (ASI_PHYS_BYPASS_EC_E), "i" (GET_TICK_NINSTR));
94
95	return tick;
96}
97
98#endif /* _SPARC64_TIMER_H */