drivers/net/ax88796.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (c) 2007 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
   4  */
   5 #include <common.h>
   6 #include <linux/delay.h>
   7 #include "ax88796.h"
   8
   9 /*
  10  * Set 1 bit data
  11  */
  12 static void ax88796_bitset(u32 bit)
  13 {
  14         /* DATA1 */
  15         if( bit )
  16                 EEDI_HIGH;
  17         else
  18                 EEDI_LOW;
  19
  20         EECLK_LOW;
  21         udelay(1000);
  22         EECLK_HIGH;
  23         udelay(1000);
  24         EEDI_LOW;
  25 }
  26
  27 /*
  28  * Get 1 bit data
  29  */
  30 static u8 ax88796_bitget(void)
  31 {
  32         u8 bit;
  33
  34         EECLK_LOW;
  35         udelay(1000);
  36         /* DATA */
  37         bit = EEDO;
  38         EECLK_HIGH;
  39         udelay(1000);
  40
  41         return bit;
  42 }
  43
  44 /*
  45  * Send COMMAND to EEPROM
  46  */
  47 static void ax88796_eep_cmd(u8 cmd)
  48 {
  49         ax88796_bitset(BIT_DUMMY);
  50         switch(cmd){
  51                 case MAC_EEP_READ:
  52                         ax88796_bitset(1);
  53                         ax88796_bitset(1);
  54                         ax88796_bitset(0);
  55                         break;
  56
  57                 case MAC_EEP_WRITE:
  58                         ax88796_bitset(1);
  59                         ax88796_bitset(0);
  60                         ax88796_bitset(1);
  61                         break;
  62
  63                 case MAC_EEP_ERACE:
  64                         ax88796_bitset(1);
  65                         ax88796_bitset(1);
  66                         ax88796_bitset(1);
  67                         break;
  68
  69                 case MAC_EEP_EWEN:
  70                         ax88796_bitset(1);
  71                         ax88796_bitset(0);
  72                         ax88796_bitset(0);
  73                         break;
  74
  75                 case MAC_EEP_EWDS:
  76                         ax88796_bitset(1);
  77                         ax88796_bitset(0);
  78                         ax88796_bitset(0);
  79                         break;
  80                 default:
  81                         break;
  82         }
  83 }
  84
  85 static void ax88796_eep_setaddr(u16 addr)
  86 {
  87         int i ;
  88
  89         for( i = 7 ; i >= 0 ; i-- )
  90                 ax88796_bitset(addr & (1 << i));
  91 }
  92
  93 /*
  94  * Get data from EEPROM
  95  */
  96 static u16 ax88796_eep_getdata(void)
  97 {
  98         ushort data = 0;
  99         int i;
 100
 101         ax88796_bitget();       /* DUMMY */
 102         for( i = 0 ; i < 16 ; i++ ){
 103                 data <<= 1;
 104                 data |= ax88796_bitget();
 105         }
 106         return data;
 107 }
 108
 109 static void ax88796_mac_read(u8 *buff)
 110 {
 111         int i ;
 112         u16 data;
 113         u16 addr = 0;
 114
 115         for( i = 0 ; i < 3; i++ )
 116         {
 117                 EECS_HIGH;
 118                 EEDI_LOW;
 119                 udelay(1000);
 120                 /* READ COMMAND */
 121                 ax88796_eep_cmd(MAC_EEP_READ);
 122                 /* ADDRESS */
 123                 ax88796_eep_setaddr(addr++);
 124                 /* GET DATA */
 125                 data = ax88796_eep_getdata();
 126                 *buff++ = (uchar)(data & 0xff);
 127                 *buff++ = (uchar)((data >> 8) & 0xff);
 128                 EECLK_LOW;
 129                 EEDI_LOW;
 130                 EECS_LOW;
 131         }
 132 }
 133
 134 int get_prom(u8* mac_addr, u8* base_addr)
 135 {
 136         u8 prom[32];
 137         int i;
 138
 139         ax88796_mac_read(prom);
 140         for (i = 0; i < 6; i++){
 141                 mac_addr[i] = prom[i];
 142         }
 143         return 1;
 144 }