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Annotation of XNU/iokit/Drivers/network/drvPPCBMac/BMacEnetHW.cpp, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1998-1999 by Apple Computer, Inc., All rights reserved.
        !            24:  *
        !            25:  * Miscellaneous definitions for the BMac Ethernet controller.
        !            26:  *
        !            27:  * HISTORY
        !            28:  *
        !            29:  */
        !            30: 
        !            31: #include "BMacEnetRegisters.h"
        !            32: #include "BMacEnetPrivate.h"
        !            33: #include <libkern/OSByteOrder.h>
        !            34: 
        !            35: void WriteBigMacRegister( IOPPCAddress ioBaseEnet, u_int32_t reg_offset, u_int16_t data )
        !            36: {
        !            37:         OSWriteSwapInt16( ioBaseEnet, reg_offset, data );
        !            38:        eieio();
        !            39: }
        !            40: 
        !            41: 
        !            42: volatile u_int16_t ReadBigMacRegister( IOPPCAddress ioBaseEnet, u_int32_t reg_offset )
        !            43: {
        !            44:         return OSReadSwapInt16( ioBaseEnet, reg_offset ); 
        !            45: }
        !            46: 
        !            47: /*
        !            48:  * Procedure for reading EEPROM 
        !            49:  */
        !            50: #define kSROMAddressLength             5
        !            51: #define kDataInOn                              0x0008
        !            52: #define kDataInOff                             0x0000
        !            53: #define kClk                                   0x0002
        !            54: #define kChipSelect                            0x0001
        !            55: #define kSDIShiftCount                 3
        !            56: #define kSD0ShiftCount                 2
        !            57: #define        kDelayValue                             1000    // number of microseconds
        !            58: 
        !            59: #define kSROMStartOffset               10              // this is in words
        !            60: #define kSROMReadCount                 3               // number of words to read from SROM 
        !            61: 
        !            62: static unsigned char clock_out_bit(IOPPCAddress base)
        !            63: {
        !            64:     u_int16_t         data;
        !            65:     u_int16_t         val;
        !            66: 
        !            67:     WriteBigMacRegister(base, kSROMCSR, kChipSelect | kClk);
        !            68:     IODelay(kDelayValue);
        !            69:     
        !            70:     data = ReadBigMacRegister(base, kSROMCSR);
        !            71:     IODelay(kDelayValue);
        !            72:     val = (data >> kSD0ShiftCount) & 1;
        !            73: 
        !            74:     WriteBigMacRegister(base, kSROMCSR, kChipSelect);
        !            75:     IODelay(kDelayValue);
        !            76:     
        !            77:     return val;
        !            78: }
        !            79: 
        !            80: static void clock_in_bit(IOPPCAddress base, unsigned int val)
        !            81: {
        !            82:     u_int16_t          data;    
        !            83: 
        !            84:     if (val != 0 && val != 1)  
        !            85:     {
        !            86:        IOLog("bogus data in clock_in_bit\n");
        !            87:        return;
        !            88:     }
        !            89:     
        !            90:     data = (val << kSDIShiftCount);
        !            91:     WriteBigMacRegister(base, kSROMCSR, data | kChipSelect  );
        !            92:     IODelay(kDelayValue);
        !            93:     
        !            94:     WriteBigMacRegister(base, kSROMCSR, data | kChipSelect | kClk );
        !            95:     IODelay(kDelayValue);
        !            96: 
        !            97:     WriteBigMacRegister(base, kSROMCSR, data | kChipSelect);
        !            98:     IODelay(kDelayValue);
        !            99: }
        !           100: 
        !           101: void reset_and_select_srom(IOPPCAddress base)
        !           102: {
        !           103:     /* first reset */
        !           104:     WriteBigMacRegister(base, kSROMCSR, 0);
        !           105:     IODelay(kDelayValue);
        !           106:     
        !           107:     /* send it the read command (110) */
        !           108:     clock_in_bit(base, 1);
        !           109:     clock_in_bit(base, 1);
        !           110:     clock_in_bit(base, 0);
        !           111: }
        !           112: 
        !           113: unsigned short read_srom(IOPPCAddress base, unsigned int addr,
        !           114:        unsigned int addr_len)
        !           115: {
        !           116:     unsigned short data, val;
        !           117:     unsigned int i;
        !           118:     
        !           119:     /* send out the address we want to read from */
        !           120:     for (i = 0; i < addr_len; i++)     {
        !           121:        val = addr >> (addr_len-i-1);
        !           122:        clock_in_bit(base, val & 1);
        !           123:     }
        !           124:     
        !           125:     /* Now read in the 16-bit data */
        !           126:     data = 0;
        !           127:     for (i = 0; i < 16; i++)   {
        !           128:        val = clock_out_bit(base);
        !           129:        data <<= 1;
        !           130:        data |= val;
        !           131:     }
        !           132:     WriteBigMacRegister(base, kSROMCSR, 0);
        !           133:     
        !           134:     return data;
        !           135: }

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