1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun /* timer.h: System timer definitions for sun5.
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net)
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #ifndef _SPARC64_TIMER_H
8*4882a593Smuzhiyun #define _SPARC64_TIMER_H
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <uapi/asm/asi.h>
11*4882a593Smuzhiyun #include <linux/types.h>
12*4882a593Smuzhiyun #include <linux/init.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun /* The most frequently accessed fields should be first,
15*4882a593Smuzhiyun * to fit into the same cacheline.
16*4882a593Smuzhiyun */
17*4882a593Smuzhiyun struct sparc64_tick_ops {
18*4882a593Smuzhiyun unsigned long ticks_per_nsec_quotient;
19*4882a593Smuzhiyun unsigned long offset;
20*4882a593Smuzhiyun unsigned long long (*get_tick)(void);
21*4882a593Smuzhiyun int (*add_compare)(unsigned long);
22*4882a593Smuzhiyun unsigned long softint_mask;
23*4882a593Smuzhiyun void (*disable_irq)(void);
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun void (*init_tick)(void);
26*4882a593Smuzhiyun unsigned long (*add_tick)(unsigned long);
27*4882a593Smuzhiyun unsigned long (*get_frequency)(void);
28*4882a593Smuzhiyun unsigned long frequency;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun char *name;
31*4882a593Smuzhiyun };
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun extern struct sparc64_tick_ops *tick_ops;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun unsigned long sparc64_get_clock_tick(unsigned int cpu);
36*4882a593Smuzhiyun void setup_sparc64_timer(void);
37*4882a593Smuzhiyun void __init time_init(void);
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun #define TICK_PRIV_BIT BIT(63)
40*4882a593Smuzhiyun #define TICKCMP_IRQ_BIT BIT(63)
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun #define HBIRD_STICKCMP_ADDR 0x1fe0000f060UL
43*4882a593Smuzhiyun #define HBIRD_STICK_ADDR 0x1fe0000f070UL
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun #define GET_TICK_NINSTR 13
46*4882a593Smuzhiyun struct get_tick_patch {
47*4882a593Smuzhiyun unsigned int addr;
48*4882a593Smuzhiyun unsigned int tick[GET_TICK_NINSTR];
49*4882a593Smuzhiyun unsigned int stick[GET_TICK_NINSTR];
50*4882a593Smuzhiyun };
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun extern struct get_tick_patch __get_tick_patch;
53*4882a593Smuzhiyun extern struct get_tick_patch __get_tick_patch_end;
54*4882a593Smuzhiyun
get_tick(void)55*4882a593Smuzhiyun static inline unsigned long get_tick(void)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun unsigned long tick, tmp1, tmp2;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun __asm__ __volatile__(
60*4882a593Smuzhiyun /* read hbtick 13 instructions */
61*4882a593Smuzhiyun "661:\n"
62*4882a593Smuzhiyun " mov 0x1fe, %1\n"
63*4882a593Smuzhiyun " sllx %1, 0x20, %1\n"
64*4882a593Smuzhiyun " sethi %%hi(0xf000), %2\n"
65*4882a593Smuzhiyun " or %2, 0x70, %2\n"
66*4882a593Smuzhiyun " or %1, %2, %1\n" /* %1 = HBIRD_STICK_ADDR */
67*4882a593Smuzhiyun " add %1, 8, %2\n"
68*4882a593Smuzhiyun " ldxa [%2]%3, %0\n"
69*4882a593Smuzhiyun " ldxa [%1]%3, %1\n"
70*4882a593Smuzhiyun " ldxa [%2]%3, %2\n"
71*4882a593Smuzhiyun " sub %2, %0, %0\n" /* don't modify %xcc */
72*4882a593Smuzhiyun " brnz,pn %0, 661b\n" /* restart to save one register */
73*4882a593Smuzhiyun " sllx %2, 32, %2\n"
74*4882a593Smuzhiyun " or %2, %1, %0\n"
75*4882a593Smuzhiyun /* Common/not patched code */
76*4882a593Smuzhiyun " sllx %0, 1, %0\n"
77*4882a593Smuzhiyun " srlx %0, 1, %0\n" /* Clear TICK_PRIV_BIT */
78*4882a593Smuzhiyun /* Beginning of patch section */
79*4882a593Smuzhiyun " .section .get_tick_patch, \"ax\"\n"
80*4882a593Smuzhiyun " .word 661b\n"
81*4882a593Smuzhiyun /* read tick 2 instructions and 11 skipped */
82*4882a593Smuzhiyun " ba 1f\n"
83*4882a593Smuzhiyun " rd %%tick, %0\n"
84*4882a593Smuzhiyun " .skip 4 * (%4 - 2)\n"
85*4882a593Smuzhiyun "1:\n"
86*4882a593Smuzhiyun /* read stick 2 instructions and 11 skipped */
87*4882a593Smuzhiyun " ba 1f\n"
88*4882a593Smuzhiyun " rd %%asr24, %0\n"
89*4882a593Smuzhiyun " .skip 4 * (%4 - 2)\n"
90*4882a593Smuzhiyun "1:\n"
91*4882a593Smuzhiyun /* End of patch section */
92*4882a593Smuzhiyun " .previous\n"
93*4882a593Smuzhiyun : "=&r" (tick), "=&r" (tmp1), "=&r" (tmp2)
94*4882a593Smuzhiyun : "i" (ASI_PHYS_BYPASS_EC_E), "i" (GET_TICK_NINSTR));
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun return tick;
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun #endif /* _SPARC64_TIMER_H */
100