LXR uboot/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 */
  11static 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 */
  29static 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 */
  46static 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
  84static 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 */
  95static 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
 108static 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
 133int 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}
 144