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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 | /****************************************************************************** * * Name: skgehwt.c * Project: Gigabit Ethernet Adapters, Event Scheduler Module * Version: $Revision: 1.15 $ * Date: $Date: 2003/09/16 13:41:23 $ * Purpose: Hardware Timer * ******************************************************************************/ /****************************************************************************** * * (C)Copyright 1998-2002 SysKonnect GmbH. * (C)Copyright 2002-2003 Marvell. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * The information in this file is provided "AS IS" without warranty. * ******************************************************************************/ /* * Event queue and dispatcher */ #if (defined(DEBUG) || ((!defined(LINT)) && (!defined(SK_SLIM)))) static const char SysKonnectFileId[] = "@(#) $Id: skgehwt.c,v 1.15 2003/09/16 13:41:23 rschmidt Exp $ (C) Marvell."; #endif #include "h/skdrv1st.h" /* Driver Specific Definitions */ #include "h/skdrv2nd.h" /* Adapter Control- and Driver specific Def. */ #ifdef __C2MAN__ /* * Hardware Timer function queue management. */ intro() {} #endif /* * Prototypes of local functions. */ #define SK_HWT_MAX (65000) /* correction factor */ #define SK_HWT_FAC (1000 * (SK_U32)pAC->GIni.GIHstClkFact / 100) /* * Initialize hardware timer. * * Must be called during init level 1. */ void SkHwtInit( SK_AC *pAC, /* Adapters context */ SK_IOC Ioc) /* IoContext */ { pAC->Hwt.TStart = 0 ; pAC->Hwt.TStop = 0 ; pAC->Hwt.TActive = SK_FALSE; SkHwtStop(pAC, Ioc); } /* * * Start hardware timer (clock ticks are 16us). * */ void SkHwtStart( SK_AC *pAC, /* Adapters context */ SK_IOC Ioc, /* IoContext */ SK_U32 Time) /* Time in units of 16us to load the timer with. */ { SK_U32 Cnt; if (Time > SK_HWT_MAX) Time = SK_HWT_MAX; pAC->Hwt.TStart = Time; pAC->Hwt.TStop = 0L; Cnt = Time; /* * if time < 16 us * time = 16 us */ if (!Cnt) { Cnt++; } SK_OUT32(Ioc, B2_TI_INI, Cnt * SK_HWT_FAC); SK_OUT16(Ioc, B2_TI_CTRL, TIM_START); /* Start timer. */ pAC->Hwt.TActive = SK_TRUE; } /* * Stop hardware timer. * and clear the timer IRQ */ void SkHwtStop( SK_AC *pAC, /* Adapters context */ SK_IOC Ioc) /* IoContext */ { SK_OUT16(Ioc, B2_TI_CTRL, TIM_STOP); SK_OUT16(Ioc, B2_TI_CTRL, TIM_CLR_IRQ); pAC->Hwt.TActive = SK_FALSE; } /* * Stop hardware timer and read time elapsed since last start. * * returns * The elapsed time since last start in units of 16us. * */ SK_U32 SkHwtRead( SK_AC *pAC, /* Adapters context */ SK_IOC Ioc) /* IoContext */ { SK_U32 TRead; SK_U32 IStatus; if (pAC->Hwt.TActive) { SkHwtStop(pAC, Ioc); SK_IN32(Ioc, B2_TI_VAL, &TRead); TRead /= SK_HWT_FAC; SK_IN32(Ioc, B0_ISRC, &IStatus); /* Check if timer expired (or wraped around) */ if ((TRead > pAC->Hwt.TStart) || (IStatus & IS_TIMINT)) { SkHwtStop(pAC, Ioc); pAC->Hwt.TStop = pAC->Hwt.TStart; } else { pAC->Hwt.TStop = pAC->Hwt.TStart - TRead; } } return(pAC->Hwt.TStop); } /* * interrupt source= timer */ void SkHwtIsr( SK_AC *pAC, /* Adapters context */ SK_IOC Ioc) /* IoContext */ { SkHwtStop(pAC, Ioc); pAC->Hwt.TStop = pAC->Hwt.TStart; SkTimerDone(pAC, Ioc); } /* End of file */ |