Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 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 | |
Pavel Tatashin | 178bf2b | 2017-06-12 16:41:44 -0400 | [diff] [blame] | 13 | /* The most frequently accessed fields should be first, |
| 14 | * to fit into the same cacheline. |
| 15 | */ |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 16 | struct sparc64_tick_ops { |
Pavel Tatashin | 178bf2b | 2017-06-12 16:41:44 -0400 | [diff] [blame] | 17 | unsigned long ticks_per_nsec_quotient; |
| 18 | unsigned long offset; |
Sam Ravnborg | 9018113 | 2009-01-06 13:19:28 -0800 | [diff] [blame] | 19 | unsigned long long (*get_tick)(void); |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 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); |
Pavel Tatashin | 89108c3 | 2017-06-12 16:41:45 -0400 | [diff] [blame] | 26 | unsigned long (*get_frequency)(void); |
| 27 | unsigned long frequency; |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 28 | |
| 29 | char *name; |
| 30 | }; |
| 31 | |
| 32 | extern struct sparc64_tick_ops *tick_ops; |
| 33 | |
Sam Ravnborg | f05a686 | 2014-05-16 23:25:50 +0200 | [diff] [blame] | 34 | unsigned long sparc64_get_clock_tick(unsigned int cpu); |
| 35 | void setup_sparc64_timer(void); |
| 36 | void __init time_init(void); |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 37 | |
Pavel Tatashin | 4929c83 | 2017-06-12 16:41:47 -0400 | [diff] [blame] | 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 | |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 98 | #endif /* _SPARC64_TIMER_H */ |