Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2001 MontaVista Software Inc. |
| 3 | * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net |
| 4 | * Copyright (c) 2003, 2004 Maciej W. Rozycki |
| 5 | * |
Atsushi Nemoto | d9eec1a | 2007-10-31 01:21:03 +0900 | [diff] [blame] | 6 | * Common time service routines for MIPS machines. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License as published by the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * Free Software Foundation; either version 2 of the License, or (at your |
| 11 | * option) any later version. |
| 12 | */ |
Ralf Baechle | 656db50 | 2007-10-26 13:24:06 +0100 | [diff] [blame] | 13 | #include <linux/bug.h> |
Ralf Baechle | 7bcf771 | 2007-10-11 23:46:09 +0100 | [diff] [blame] | 14 | #include <linux/clockchips.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/types.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/sched.h> |
| 19 | #include <linux/param.h> |
| 20 | #include <linux/time.h> |
| 21 | #include <linux/timex.h> |
| 22 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/spinlock.h> |
Paul Gortmaker | 73bc256 | 2011-07-23 16:30:40 -0400 | [diff] [blame] | 24 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <asm/cpu-features.h> |
Ralf Baechle | 69f24d1 | 2013-09-17 10:25:47 +0200 | [diff] [blame] | 27 | #include <asm/cpu-type.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <asm/div64.h> |
Ralf Baechle | ea58040 | 2007-10-11 23:46:09 +0100 | [diff] [blame] | 29 | #include <asm/smtc_ipi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <asm/time.h> |
| 31 | |
| 32 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | * forward reference |
| 34 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | DEFINE_SPINLOCK(rtc_lock); |
Ralf Baechle | 4b55048 | 2007-10-11 23:46:08 +0100 | [diff] [blame] | 36 | EXPORT_SYMBOL(rtc_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Ralf Baechle | 4b55048 | 2007-10-11 23:46:08 +0100 | [diff] [blame] | 38 | int __weak rtc_mips_set_time(unsigned long sec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | { |
| 40 | return 0; |
| 41 | } |
| 42 | |
Ralf Baechle | 4b55048 | 2007-10-11 23:46:08 +0100 | [diff] [blame] | 43 | int __weak rtc_mips_set_mmss(unsigned long nowtime) |
| 44 | { |
| 45 | return rtc_mips_set_time(nowtime); |
| 46 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Ralf Baechle | f5ff0a2 | 2007-08-13 15:26:12 +0100 | [diff] [blame] | 48 | int update_persistent_clock(struct timespec now) |
| 49 | { |
| 50 | return rtc_mips_set_mmss(now.tv_sec); |
| 51 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Dmitri Vorobiev | 4668473 | 2008-04-02 03:58:38 +0400 | [diff] [blame] | 53 | static int null_perf_irq(void) |
Ralf Baechle | ba339c0 | 2005-12-09 12:29:38 +0000 | [diff] [blame] | 54 | { |
| 55 | return 0; |
| 56 | } |
| 57 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 58 | int (*perf_irq)(void) = null_perf_irq; |
Ralf Baechle | ba339c0 | 2005-12-09 12:29:38 +0000 | [diff] [blame] | 59 | |
Ralf Baechle | ba339c0 | 2005-12-09 12:29:38 +0000 | [diff] [blame] | 60 | EXPORT_SYMBOL(perf_irq); |
| 61 | |
Chris Dearman | ffe9ee4 | 2007-05-24 22:24:20 +0100 | [diff] [blame] | 62 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | * time_init() - it does the following things. |
| 64 | * |
Ralf Baechle | 4b55048 | 2007-10-11 23:46:08 +0100 | [diff] [blame] | 65 | * 1) plat_time_init() - |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 66 | * a) (optional) set up RTC routines, |
| 67 | * b) (optional) calibrate and set the mips_hpt_frequency |
Atsushi Nemoto | 16b7b2a | 2006-10-24 00:21:27 +0900 | [diff] [blame] | 68 | * (only needed if you intended to use cpu counter as timer interrupt |
| 69 | * source) |
Ralf Baechle | 4b55048 | 2007-10-11 23:46:08 +0100 | [diff] [blame] | 70 | * 2) calculate a couple of cached variables for later usage |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | */ |
| 72 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | unsigned int mips_hpt_frequency; |
| 74 | |
Ralf Baechle | 656db50 | 2007-10-26 13:24:06 +0100 | [diff] [blame] | 75 | /* |
| 76 | * This function exists in order to cause an error due to a duplicate |
| 77 | * definition if platform code should have its own implementation. The hook |
| 78 | * to use instead is plat_time_init. plat_time_init does not receive the |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 79 | * irqaction pointer argument anymore. This is because any function which |
Ralf Baechle | 656db50 | 2007-10-26 13:24:06 +0100 | [diff] [blame] | 80 | * initializes an interrupt timer now takes care of its own request_irq rsp. |
| 81 | * setup_irq calls and each clock_event_device should use its own |
| 82 | * struct irqrequest. |
| 83 | */ |
Atsushi Nemoto | d9eec1a | 2007-10-31 01:21:03 +0900 | [diff] [blame] | 84 | void __init plat_timer_setup(void) |
Ralf Baechle | 7bcf771 | 2007-10-11 23:46:09 +0100 | [diff] [blame] | 85 | { |
Ralf Baechle | 656db50 | 2007-10-26 13:24:06 +0100 | [diff] [blame] | 86 | BUG(); |
Ralf Baechle | 7bcf771 | 2007-10-11 23:46:09 +0100 | [diff] [blame] | 87 | } |
| 88 | |
Ralf Baechle | 5aa85c9 | 2007-11-21 16:39:44 +0000 | [diff] [blame] | 89 | static __init int cpu_has_mfc0_count_bug(void) |
| 90 | { |
| 91 | switch (current_cpu_type()) { |
| 92 | case CPU_R4000PC: |
| 93 | case CPU_R4000SC: |
| 94 | case CPU_R4000MC: |
| 95 | /* |
| 96 | * V3.0 is documented as suffering from the mfc0 from count bug. |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 97 | * Afaik this is the last version of the R4000. Later versions |
Ralf Baechle | 5aa85c9 | 2007-11-21 16:39:44 +0000 | [diff] [blame] | 98 | * were marketed as R4400. |
| 99 | */ |
| 100 | return 1; |
| 101 | |
| 102 | case CPU_R4400PC: |
| 103 | case CPU_R4400SC: |
| 104 | case CPU_R4400MC: |
| 105 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 106 | * The published errata for the R4400 up to 3.0 say the CPU |
Ralf Baechle | 5aa85c9 | 2007-11-21 16:39:44 +0000 | [diff] [blame] | 107 | * has the mfc0 from count bug. |
| 108 | */ |
| 109 | if ((current_cpu_data.processor_id & 0xff) <= 0x30) |
| 110 | return 1; |
| 111 | |
| 112 | /* |
Thomas Bogendoerfer | ce202cb | 2008-01-04 23:38:31 +0100 | [diff] [blame] | 113 | * we assume newer revisions are ok |
Ralf Baechle | 5aa85c9 | 2007-11-21 16:39:44 +0000 | [diff] [blame] | 114 | */ |
Thomas Bogendoerfer | ce202cb | 2008-01-04 23:38:31 +0100 | [diff] [blame] | 115 | return 0; |
Ralf Baechle | 5aa85c9 | 2007-11-21 16:39:44 +0000 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | return 0; |
| 119 | } |
| 120 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | void __init time_init(void) |
| 122 | { |
Ralf Baechle | 4b55048 | 2007-10-11 23:46:08 +0100 | [diff] [blame] | 123 | plat_time_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
Maciej W. Rozycki | afddce0 | 2013-09-03 01:29:58 +0100 | [diff] [blame] | 125 | /* |
| 126 | * The use of the R4k timer as a clock event takes precedence; |
| 127 | * if reading the Count register might interfere with the timer |
| 128 | * interrupt, then we don't use the timer as a clock source. |
| 129 | * We may still use the timer as a clock source though if the |
| 130 | * timer interrupt isn't reliable; the interference doesn't |
| 131 | * matter then, because we don't use the interrupt. |
| 132 | */ |
| 133 | if (mips_clockevent_init() != 0 || !cpu_has_mfc0_count_bug()) |
Atsushi Nemoto | d9eec1a | 2007-10-31 01:21:03 +0900 | [diff] [blame] | 134 | init_mips_clocksource(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | } |