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