acpi_timer.c revision 1.10.10.3
1 1.10.10.3 yamt /* $NetBSD: acpi_timer.c,v 1.10.10.3 2010/03/11 15:03:22 yamt Exp $ */ 2 1.10.10.3 yamt 3 1.10.10.3 yamt /*- 4 1.10.10.3 yamt * Copyright (c) 2006 Matthias Drochner <drochner (at) NetBSD.org> 5 1.10.10.3 yamt * All rights reserved. 6 1.10.10.3 yamt * 7 1.10.10.3 yamt * Redistribution and use in source and binary forms, with or without 8 1.10.10.3 yamt * modification, are permitted provided that the following conditions 9 1.10.10.3 yamt * are met: 10 1.10.10.3 yamt * 1. Redistributions of source code must retain the above copyright 11 1.10.10.3 yamt * notice, this list of conditions and the following disclaimer. 12 1.10.10.3 yamt * 2. Redistributions in binary form must reproduce the above copyright 13 1.10.10.3 yamt * notice, this list of conditions and the following disclaimer in the 14 1.10.10.3 yamt * documentation and/or other materials provided with the distribution. 15 1.10.10.3 yamt * 16 1.10.10.3 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 1.10.10.3 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 1.10.10.3 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 1.10.10.3 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 1.10.10.3 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 1.10.10.3 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 1.10.10.3 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 1.10.10.3 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 1.10.10.3 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 1.10.10.3 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 1.10.10.3 yamt * POSSIBILITY OF SUCH DAMAGE. 27 1.10.10.3 yamt */ 28 1.4 xtraeme 29 1.4 xtraeme #include <sys/cdefs.h> 30 1.10.10.3 yamt __KERNEL_RCSID(0, "$NetBSD: acpi_timer.c,v 1.10.10.3 2010/03/11 15:03:22 yamt Exp $"); 31 1.1 drochner 32 1.1 drochner #include <sys/types.h> 33 1.1 drochner #include <sys/systm.h> 34 1.1 drochner #include <sys/time.h> 35 1.1 drochner #include <sys/timetc.h> 36 1.10.10.3 yamt 37 1.10.10.3 yamt #include <dev/acpi/acpivar.h> 38 1.10 joerg #include <dev/acpi/acpi_timer.h> 39 1.10.10.3 yamt 40 1.10.10.2 yamt #include <machine/acpi_machdep.h> 41 1.1 drochner 42 1.2 drochner static int acpitimer_test(void); 43 1.2 drochner static uint32_t acpitimer_delta(uint32_t, uint32_t); 44 1.2 drochner static u_int acpitimer_read_safe(struct timecounter *); 45 1.2 drochner static u_int acpitimer_read_fast(struct timecounter *); 46 1.1 drochner 47 1.1 drochner static struct timecounter acpi_timecounter = { 48 1.2 drochner acpitimer_read_safe, 49 1.1 drochner 0, 50 1.1 drochner 0x00ffffff, 51 1.1 drochner PM_TIMER_FREQUENCY, 52 1.2 drochner "ACPI-Safe", 53 1.6 christos 900, 54 1.6 christos NULL, 55 1.6 christos NULL, 56 1.1 drochner }; 57 1.1 drochner 58 1.1 drochner int 59 1.10.10.2 yamt acpitimer_init(void) 60 1.1 drochner { 61 1.1 drochner uint32_t bits; 62 1.2 drochner int i, j; 63 1.1 drochner ACPI_STATUS res; 64 1.1 drochner 65 1.1 drochner res = AcpiGetTimerResolution(&bits); 66 1.1 drochner if (res != AE_OK) 67 1.1 drochner return (-1); 68 1.1 drochner 69 1.1 drochner if (bits == 32) 70 1.1 drochner acpi_timecounter.tc_counter_mask = 0xffffffff; 71 1.2 drochner 72 1.2 drochner j = 0; 73 1.2 drochner for (i = 0; i < 10; i++) 74 1.2 drochner j += acpitimer_test(); 75 1.3 xtraeme 76 1.2 drochner if (j >= 10) { 77 1.2 drochner acpi_timecounter.tc_name = "ACPI-Fast"; 78 1.2 drochner acpi_timecounter.tc_get_timecount = acpitimer_read_fast; 79 1.2 drochner acpi_timecounter.tc_quality = 1000; 80 1.2 drochner } 81 1.2 drochner 82 1.1 drochner tc_init(&acpi_timecounter); 83 1.10.10.1 yamt aprint_verbose("%s %d-bit timer\n", acpi_timecounter.tc_name, bits); 84 1.1 drochner 85 1.2 drochner return (0); 86 1.2 drochner } 87 1.1 drochner 88 1.10.10.2 yamt int 89 1.10.10.2 yamt acpitimer_detach(void) 90 1.10.10.2 yamt { 91 1.10.10.2 yamt return tc_detach(&acpi_timecounter); 92 1.10.10.2 yamt } 93 1.10.10.2 yamt 94 1.2 drochner static u_int 95 1.8 christos acpitimer_read_fast(struct timecounter *tc) 96 1.2 drochner { 97 1.2 drochner uint32_t t; 98 1.2 drochner 99 1.2 drochner AcpiGetTimer(&t); 100 1.2 drochner return (t); 101 1.1 drochner } 102 1.1 drochner 103 1.1 drochner /* 104 1.1 drochner * Some chipsets (PIIX4 variants) do not latch correctly; there 105 1.1 drochner * is a chance that a transition is hit. 106 1.1 drochner */ 107 1.1 drochner static u_int 108 1.8 christos acpitimer_read_safe(struct timecounter *tc) 109 1.1 drochner { 110 1.1 drochner uint32_t t1, t2, t3; 111 1.1 drochner 112 1.1 drochner AcpiGetTimer(&t2); 113 1.1 drochner AcpiGetTimer(&t3); 114 1.1 drochner do { 115 1.1 drochner t1 = t2; 116 1.1 drochner t2 = t3; 117 1.1 drochner AcpiGetTimer(&t3); 118 1.1 drochner } while ((t1 > t2) || (t2 > t3)); 119 1.1 drochner return (t2); 120 1.1 drochner } 121 1.1 drochner 122 1.2 drochner static uint32_t 123 1.2 drochner acpitimer_delta(uint32_t end, uint32_t start) 124 1.2 drochner { 125 1.2 drochner uint32_t delta; 126 1.2 drochner u_int mask = acpi_timecounter.tc_counter_mask; 127 1.2 drochner 128 1.2 drochner if (end >= start) 129 1.2 drochner delta = end - start; 130 1.2 drochner else 131 1.2 drochner delta = ((mask - start) + end + 1) & mask; 132 1.2 drochner 133 1.2 drochner return (delta); 134 1.2 drochner } 135 1.2 drochner 136 1.2 drochner #define N 2000 137 1.2 drochner static int 138 1.10.10.2 yamt acpitimer_test(void) 139 1.2 drochner { 140 1.2 drochner uint32_t last, this, delta; 141 1.2 drochner int minl, maxl, n; 142 1.2 drochner 143 1.2 drochner minl = 10000000; 144 1.2 drochner maxl = 0; 145 1.2 drochner 146 1.10.10.2 yamt acpi_md_OsDisableInterrupt(); 147 1.2 drochner AcpiGetTimer(&last); 148 1.2 drochner for (n = 0; n < N; n++) { 149 1.2 drochner AcpiGetTimer(&this); 150 1.2 drochner delta = acpitimer_delta(this, last); 151 1.2 drochner if (delta > maxl) 152 1.2 drochner maxl = delta; 153 1.2 drochner else if (delta < minl) 154 1.2 drochner minl = delta; 155 1.2 drochner last = this; 156 1.2 drochner } 157 1.10.10.2 yamt acpi_md_OsEnableInterrupt(); 158 1.2 drochner 159 1.2 drochner if (maxl - minl > 2 ) 160 1.2 drochner n = 0; 161 1.2 drochner else if (minl < 0 || maxl == 0) 162 1.2 drochner n = 0; 163 1.2 drochner else 164 1.2 drochner n = 1; 165 1.2 drochner 166 1.2 drochner return (n); 167 1.2 drochner } 168
Indexes created Fri Sep 26 20:09:58 GMT 2025