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Annotation of kernel/bsd/dev/ppc/drvBMacEnet/BMacEnetHW.m, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: 
                     25: /*
                     26:  * Copyright (c) 1998-1999 by Apple Computer, Inc., All rights reserved.
                     27:  *
                     28:  * Miscellaneous definitions for the BMac Ethernet controller.
                     29:  *
                     30:  * HISTORY
                     31:  *
                     32:  */
                     33: 
                     34: #import "BMacEnetRegisters.h"
                     35: #import "BMacEnetPrivate.h"
                     36: 
                     37: 
                     38: void WriteBigMacRegister( IOPPCAddress ioBaseEnet, u_int32_t reg_offset, u_int16_t data )
                     39: {
                     40:   WriteSwap16( ioBaseEnet, reg_offset, data );
                     41:   eieio();
                     42: }
                     43: 
                     44: 
                     45: volatile u_int16_t ReadBigMacRegister( IOPPCAddress ioBaseEnet, u_int32_t reg_offset )
                     46: {
                     47:   return ReadSwap16( ioBaseEnet, reg_offset ); 
                     48: }
                     49: 
                     50: /*
                     51:  * Procedure for reading EEPROM 
                     52:  */
                     53: #define kSROMAddressLength             5
                     54: #define kDataInOn                      0x0008
                     55: #define kDataInOff                     0x0000
                     56: #define kClk                           0x0002
                     57: #define kChipSelect                    0x0001
                     58: #define kSDIShiftCount                 3
                     59: #define kSD0ShiftCount                 2
                     60: #define        kDelayValue                     1000                            // number of microseconds
                     61: 
                     62: #define kSROMStartOffset               10                              // this is in words
                     63: #define kSROMReadCount                 3                               // number of words to read from SROM 
                     64: 
                     65: unsigned char clock_out_bit(IOPPCAddress base)
                     66: {
                     67:     u_int16_t         data;
                     68:     u_int16_t         val;
                     69: 
                     70:     WriteBigMacRegister(base, kSROMCSR, kChipSelect | kClk);
                     71:     IODelay(kDelayValue);
                     72:     
                     73:     data = ReadBigMacRegister(base, kSROMCSR);
                     74:     IODelay(kDelayValue);
                     75:     val = (data >> kSD0ShiftCount) & 1;
                     76: 
                     77:     WriteBigMacRegister(base, kSROMCSR, kChipSelect);
                     78:     IODelay(kDelayValue);
                     79:     
                     80:     return val;
                     81: }
                     82: 
                     83: void clock_in_bit(IOPPCAddress base, unsigned int val)
                     84: {
                     85:     u_int16_t          data;    
                     86: 
                     87:     if (val != 0 && val != 1)  
                     88:     {
                     89:        IOLog("bogus data in clock_in_bit\n");
                     90:        return;
                     91:     }
                     92:     
                     93:     data = (val << kSDIShiftCount);
                     94:     WriteBigMacRegister(base, kSROMCSR, data | kChipSelect  );
                     95:     IODelay(kDelayValue);
                     96:     
                     97:     WriteBigMacRegister(base, kSROMCSR, data | kChipSelect | kClk );
                     98:     IODelay(kDelayValue);
                     99: 
                    100:     WriteBigMacRegister(base, kSROMCSR, data | kChipSelect);
                    101:     IODelay(kDelayValue);
                    102: }
                    103: 
                    104: void reset_and_select_srom(IOPPCAddress base)
                    105: {
                    106:     /* first reset */
                    107:     WriteBigMacRegister(base, kSROMCSR, 0);
                    108:     IODelay(kDelayValue);
                    109:     
                    110:     /* send it the read command (110) */
                    111:     clock_in_bit(base, 1);
                    112:     clock_in_bit(base, 1);
                    113:     clock_in_bit(base, 0);
                    114: }
                    115: 
                    116: unsigned short read_srom(IOPPCAddress base, unsigned int addr, unsigned int addr_len)
                    117: {
                    118:     unsigned short data, val;
                    119:     int i;
                    120:     
                    121:     /* send out the address we want to read from */
                    122:     for (i = 0; i < addr_len; i++)     {
                    123:        val = addr >> (addr_len-i-1);
                    124:        clock_in_bit(base, val & 1);
                    125:     }
                    126:     
                    127:     /* Now read in the 16-bit data */
                    128:     data = 0;
                    129:     for (i = 0; i < 16; i++)   {
                    130:        val = clock_out_bit(base);
                    131:        data <<= 1;
                    132:        data |= val;
                    133:     }
                    134:     WriteBigMacRegister(base, kSROMCSR, 0);
                    135:     
                    136:     return data;
                    137: }

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