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