1 /*
2 This files contains card eeprom (93c46 or 93c56) programming routines,
3 memory is addressed by 16 bits words.
4
5 This is part of rtl8180 OpenSource driver.
6 Copyright (C) Andrea Merello 2004 <andreamrl@tiscali.it>
7 Released under the terms of GPL (General Public Licence)
8
9 Parts of this driver are based on the GPL part of the
10 official realtek driver.
11
12 Parts of this driver are based on the rtl8180 driver skeleton
13 from Patric Schenke & Andres Salomon.
14
15 Parts of this driver are based on the Intel Pro Wireless 2100 GPL driver.
16
17 We want to tanks the Authors of those projects and the Ndiswrapper
18 project Authors.
19 */
20
21 #include "r8180_93cx6.h"
22
eprom_cs(struct net_device * dev,short bit)23 void eprom_cs(struct net_device *dev, short bit)
24 {
25 if(bit)
26 write_nic_byte_E(dev, EPROM_CMD,
27 (1<<EPROM_CS_SHIFT) | \
28 read_nic_byte_E(dev, EPROM_CMD)); //enable EPROM
29 else
30 write_nic_byte_E(dev, EPROM_CMD, read_nic_byte_E(dev, EPROM_CMD)\
31 &~(1<<EPROM_CS_SHIFT)); //disable EPROM
32
33 force_pci_posting(dev);
34 udelay(EPROM_DELAY);
35 }
36
37
eprom_ck_cycle(struct net_device * dev)38 void eprom_ck_cycle(struct net_device *dev)
39 {
40 write_nic_byte_E(dev, EPROM_CMD,
41 (1<<EPROM_CK_SHIFT) | read_nic_byte_E(dev,EPROM_CMD));
42 force_pci_posting(dev);
43 udelay(EPROM_DELAY);
44 write_nic_byte_E(dev, EPROM_CMD,
45 read_nic_byte_E(dev, EPROM_CMD) &~ (1<<EPROM_CK_SHIFT));
46 force_pci_posting(dev);
47 udelay(EPROM_DELAY);
48 }
49
50
eprom_w(struct net_device * dev,short bit)51 void eprom_w(struct net_device *dev,short bit)
52 {
53 if(bit)
54 write_nic_byte_E(dev, EPROM_CMD, (1<<EPROM_W_SHIFT) | \
55 read_nic_byte_E(dev,EPROM_CMD));
56 else
57 write_nic_byte_E(dev, EPROM_CMD, read_nic_byte_E(dev,EPROM_CMD)\
58 &~(1<<EPROM_W_SHIFT));
59
60 force_pci_posting(dev);
61 udelay(EPROM_DELAY);
62 }
63
64
eprom_r(struct net_device * dev)65 short eprom_r(struct net_device *dev)
66 {
67 short bit;
68
69 bit=(read_nic_byte_E(dev, EPROM_CMD) & (1<<EPROM_R_SHIFT) );
70 udelay(EPROM_DELAY);
71
72 if(bit) return 1;
73 return 0;
74 }
75
76
eprom_send_bits_string(struct net_device * dev,short b[],int len)77 void eprom_send_bits_string(struct net_device *dev, short b[], int len)
78 {
79 int i;
80
81 for(i=0; i<len; i++){
82 eprom_w(dev, b[i]);
83 eprom_ck_cycle(dev);
84 }
85 }
86
87
eprom_read(struct net_device * dev,u32 addr)88 u32 eprom_read(struct net_device *dev, u32 addr)
89 {
90 struct r8192_priv *priv = ieee80211_priv(dev);
91 short read_cmd[]={1,1,0};
92 short addr_str[8];
93 int i;
94 int addr_len;
95 u32 ret;
96
97 ret=0;
98 //enable EPROM programming
99 write_nic_byte_E(dev, EPROM_CMD,
100 (EPROM_CMD_PROGRAM<<EPROM_CMD_OPERATING_MODE_SHIFT));
101 force_pci_posting(dev);
102 udelay(EPROM_DELAY);
103
104 if (priv->epromtype==EPROM_93c56){
105 addr_str[7]=addr & 1;
106 addr_str[6]=addr & (1<<1);
107 addr_str[5]=addr & (1<<2);
108 addr_str[4]=addr & (1<<3);
109 addr_str[3]=addr & (1<<4);
110 addr_str[2]=addr & (1<<5);
111 addr_str[1]=addr & (1<<6);
112 addr_str[0]=addr & (1<<7);
113 addr_len=8;
114 }else{
115 addr_str[5]=addr & 1;
116 addr_str[4]=addr & (1<<1);
117 addr_str[3]=addr & (1<<2);
118 addr_str[2]=addr & (1<<3);
119 addr_str[1]=addr & (1<<4);
120 addr_str[0]=addr & (1<<5);
121 addr_len=6;
122 }
123 eprom_cs(dev, 1);
124 eprom_ck_cycle(dev);
125 eprom_send_bits_string(dev, read_cmd, 3);
126 eprom_send_bits_string(dev, addr_str, addr_len);
127
128 //keep chip pin D to low state while reading.
129 //I'm unsure if it is necessary, but anyway shouldn't hurt
130 eprom_w(dev, 0);
131
132 for(i=0;i<16;i++){
133 //eeprom needs a clk cycle between writing opcode&adr
134 //and reading data. (eeprom outs a dummy 0)
135 eprom_ck_cycle(dev);
136 ret |= (eprom_r(dev)<<(15-i));
137 }
138
139 eprom_cs(dev, 0);
140 eprom_ck_cycle(dev);
141
142 //disable EPROM programming
143 write_nic_byte_E(dev, EPROM_CMD,
144 (EPROM_CMD_NORMAL<<EPROM_CMD_OPERATING_MODE_SHIFT));
145 return ret;
146 }
147