summaryrefslogtreecommitdiff
path: root/drivers/net/ax88796.c
blob: 20891418a1f87820711acf2b1e11afe112a909d8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
/*
 * (c) 2007 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include <common.h>
#include "ax88796.h"

/*
 * Set 1 bit data
 */
static void ax88796_bitset(u32 bit)
{
	/* DATA1 */
	if( bit )
		EEDI_HIGH;
	else
		EEDI_LOW;

	EECLK_LOW;
	udelay(1000);
	EECLK_HIGH;
	udelay(1000);
	EEDI_LOW;
}

/*
 * Get 1 bit data
 */
static u8 ax88796_bitget(void)
{
	u8 bit;

	EECLK_LOW;
	udelay(1000);
	/* DATA */
	bit = EEDO;
	EECLK_HIGH;
	udelay(1000);

	return bit;
}

/*
 * Send COMMAND to EEPROM
 */
static void ax88796_eep_cmd(u8 cmd)
{
	ax88796_bitset(BIT_DUMMY);
	switch(cmd){
		case MAC_EEP_READ:
			ax88796_bitset(1);
			ax88796_bitset(1);
			ax88796_bitset(0);
			break;

		case MAC_EEP_WRITE:
			ax88796_bitset(1);
			ax88796_bitset(0);
			ax88796_bitset(1);
			break;

		case MAC_EEP_ERACE:
			ax88796_bitset(1);
			ax88796_bitset(1);
			ax88796_bitset(1);
			break;

		case MAC_EEP_EWEN:
			ax88796_bitset(1);
			ax88796_bitset(0);
			ax88796_bitset(0);
			break;

		case MAC_EEP_EWDS:
			ax88796_bitset(1);
			ax88796_bitset(0);
			ax88796_bitset(0);
			break;
		default:
			break;
	}
}

static void ax88796_eep_setaddr(u16 addr)
{
	int i ;

	for( i = 7 ; i >= 0 ; i-- )
		ax88796_bitset(addr & (1 << i));
}

/*
 * Get data from EEPROM
 */
static u16 ax88796_eep_getdata(void)
{
	ushort data = 0;
	int i;

	ax88796_bitget();	/* DUMMY */
	for( i = 0 ; i < 16 ; i++ ){
		data <<= 1;
		data |= ax88796_bitget();
	}
	return data;
}

static void ax88796_mac_read(u8 *buff)
{
	int i ;
	u16 data;
	u16 addr = 0;

	for( i = 0 ; i < 3; i++ )
	{
		EECS_HIGH;
		EEDI_LOW;
		udelay(1000);
		/* READ COMMAND */
		ax88796_eep_cmd(MAC_EEP_READ);
		/* ADDRESS */
		ax88796_eep_setaddr(addr++);
		/* GET DATA */
		data = ax88796_eep_getdata();
		*buff++ = (uchar)(data & 0xff);
		*buff++ = (uchar)((data >> 8) & 0xff);
		EECLK_LOW;
		EEDI_LOW;
		EECS_LOW;
	}
}

int get_prom(u8* mac_addr, u8* base_addr)
{
	u8 prom[32];
	int i;

	ax88796_mac_read(prom);
	for (i = 0; i < 6; i++){
		mac_addr[i] = prom[i];
	}
	return 1;
}