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 */ 24 static 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 */ 42 static 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 */ 59 static 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 97 static 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 */ 108 static 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 } 120 121 static 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 } 145 146 int 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