Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
f5e706ad SR |
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 | ||
178bf2b9 PT |
13 | /* The most frequently accessed fields should be first, |
14 | * to fit into the same cacheline. | |
15 | */ | |
f5e706ad | 16 | struct sparc64_tick_ops { |
178bf2b9 PT |
17 | unsigned long ticks_per_nsec_quotient; |
18 | unsigned long offset; | |
90181136 | 19 | unsigned long long (*get_tick)(void); |
f5e706ad SR |
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); | |
89108c34 PT |
26 | unsigned long (*get_frequency)(void); |
27 | unsigned long frequency; | |
f5e706ad SR |
28 | |
29 | char *name; | |
30 | }; | |
31 | ||
32 | extern struct sparc64_tick_ops *tick_ops; | |
33 | ||
f05a6865 SR |
34 | unsigned long sparc64_get_clock_tick(unsigned int cpu); |
35 | void setup_sparc64_timer(void); | |
36 | void __init time_init(void); | |
f5e706ad | 37 | |
4929c83a PT |
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 | ||
f5e706ad | 98 | #endif /* _SPARC64_TIMER_H */ |