LXR uboot/drivers/net/ax88796.c

   1/*
   2 * (c) 2007 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; either version 2 of the License, or
   7 * (at your option) any later version.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write to the Free Software
  16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17 */
  18#include <common.h>
  19#include "ax88796.h"
  20
  21/*
  22 * Set 1 bit data
  23 */
  24static void ax88796_bitset(u32 bit)
  25{
  26        /* DATA1 */
  27        if( bit )
  28                EEDI_HIGH;
  29        else
  30                EEDI_LOW;
  31
  32        EECLK_LOW;
  33        udelay(1000);
  34        EECLK_HIGH;
  35        udelay(1000);
  36        EEDI_LOW;
  37}
  38
  39/*
  40 * Get 1 bit data
  41 */
  42static u8 ax88796_bitget(void)
  43{
  44        u8 bit;
  45
  46        EECLK_LOW;
  47        udelay(1000);
  48        /* DATA */
  49        bit = EEDO;
  50        EECLK_HIGH;
  51        udelay(1000);
  52
  53        return bit;
  54}
  55
  56/*
  57 * Send COMMAND to EEPROM
  58 */
  59static void ax88796_eep_cmd(u8 cmd)
  60{
  61        ax88796_bitset(BIT_DUMMY);
  62        switch(cmd){
  63                case MAC_EEP_READ:
  64                        ax88796_bitset(1);
  65                        ax88796_bitset(1);
  66                        ax88796_bitset(0);
  67                        break;
  68
  69                case MAC_EEP_WRITE:
  70                        ax88796_bitset(1);
  71                        ax88796_bitset(0);
  72                        ax88796_bitset(1);
  73                        break;
  74
  75                case MAC_EEP_ERACE:
  76                        ax88796_bitset(1);
  77                        ax88796_bitset(1);
  78                        ax88796_bitset(1);
  79                        break;
  80
  81                case MAC_EEP_EWEN:
  82                        ax88796_bitset(1);
  83                        ax88796_bitset(0);
  84                        ax88796_bitset(0);
  85                        break;
  86
  87                case MAC_EEP_EWDS:
  88                        ax88796_bitset(1);
  89                        ax88796_bitset(0);
  90                        ax88796_bitset(0);
  91                        break;
  92                default:
  93                        break;
  94        }
  95}
  96
  97static void ax88796_eep_setaddr(u16 addr)
  98{
  99        int i ;
 100
 101        for( i = 7 ; i >= 0 ; i-- )
 102                ax88796_bitset(addr & (1 << i));
 103}
 104
 105/*
 106 * Get data from EEPROM
 107 */
 108static u16 ax88796_eep_getdata(void)
 109{
 110        ushort data = 0;
 111        int i;
 112
 113        ax88796_bitget();       /* DUMMY */
 114        for( i = 0 ; i < 16 ; i++ ){
 115                data <<= 1;
 116                data |= ax88796_bitget();
 117        }
 118        return data;
 119}
 120
 121static void ax88796_mac_read(u8 *buff)
 122{
 123        int i ;
 124        u16 data;
 125        u16 addr = 0;
 126
 127        for( i = 0 ; i < 3; i++ )
 128        {
 129                EECS_HIGH;
 130                EEDI_LOW;
 131                udelay(1000);
 132                /* READ COMMAND */
 133                ax88796_eep_cmd(MAC_EEP_READ);
 134                /* ADDRESS */
 135                ax88796_eep_setaddr(addr++);
 136                /* GET DATA */
 137                data = ax88796_eep_getdata();
 138                *buff++ = (uchar)(data & 0xff);
 139                *buff++ = (uchar)((data >> 8) & 0xff);
 140                EECLK_LOW;
 141                EEDI_LOW;
 142                EECS_LOW;
 143        }
 144}
 145
 146int get_prom(u8* mac_addr, u8* base_addr)
 147{
 148        u8 prom[32];
 149        int i;
 150
 151        ax88796_mac_read(prom);
 152        for (i = 0; i < 6; i++){
 153                mac_addr[i] = prom[i];
 154        }
 155        return 1;
 156}
 157