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
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
45 struct get_tick_patch {
46 unsigned int addr;
47 unsigned int tick[GET_TICK_NINSTR];
48 unsigned int stick[GET_TICK_NINSTR];
49 };
50
51 extern struct get_tick_patch __get_tick_patch;
52 extern struct get_tick_patch __get_tick_patch_end;
53
54 static 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 */
99
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