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 <andrea.merello@gmail.com>
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 thank 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 static void eprom_cs(struct net_device *dev, short bit)
24 {
25 u8 cmdreg;
26 int err;
27
28 err = read_nic_byte_E(dev, EPROM_CMD, &cmdreg);
29 if (err)
30 return;
31 if (bit)
32 /* enable EPROM */
33 write_nic_byte_E(dev, EPROM_CMD, cmdreg | EPROM_CS_BIT);
34 else
35 /* disable EPROM */
36 write_nic_byte_E(dev, EPROM_CMD, cmdreg & ~EPROM_CS_BIT);
37
38 force_pci_posting(dev);
39 udelay(EPROM_DELAY);
40 }
41
42
eprom_ck_cycle(struct net_device * dev)43 static void eprom_ck_cycle(struct net_device *dev)
44 {
45 u8 cmdreg;
46 int err;
47
48 err = read_nic_byte_E(dev, EPROM_CMD, &cmdreg);
49 if (err)
50 return;
51 write_nic_byte_E(dev, EPROM_CMD, cmdreg | EPROM_CK_BIT);
52 force_pci_posting(dev);
53 udelay(EPROM_DELAY);
54
55 read_nic_byte_E(dev, EPROM_CMD, &cmdreg);
56 write_nic_byte_E(dev, EPROM_CMD, cmdreg & ~EPROM_CK_BIT);
57 force_pci_posting(dev);
58 udelay(EPROM_DELAY);
59 }
60
61
eprom_w(struct net_device * dev,short bit)62 static void eprom_w(struct net_device *dev, short bit)
63 {
64 u8 cmdreg;
65 int err;
66
67 err = read_nic_byte_E(dev, EPROM_CMD, &cmdreg);
68 if (err)
69 return;
70 if (bit)
71 write_nic_byte_E(dev, EPROM_CMD, cmdreg | EPROM_W_BIT);
72 else
73 write_nic_byte_E(dev, EPROM_CMD, cmdreg & ~EPROM_W_BIT);
74
75 force_pci_posting(dev);
76 udelay(EPROM_DELAY);
77 }
78
79
eprom_r(struct net_device * dev)80 static short eprom_r(struct net_device *dev)
81 {
82 u8 bit;
83 int err;
84
85 err = read_nic_byte_E(dev, EPROM_CMD, &bit);
86 if (err)
87 return err;
88
89 udelay(EPROM_DELAY);
90
91 if (bit & EPROM_R_BIT)
92 return 1;
93
94 return 0;
95 }
96
97
eprom_send_bits_string(struct net_device * dev,short b[],int len)98 static void eprom_send_bits_string(struct net_device *dev, short b[], int len)
99 {
100 int i;
101
102 for (i = 0; i < len; i++) {
103 eprom_w(dev, b[i]);
104 eprom_ck_cycle(dev);
105 }
106 }
107
108
eprom_read(struct net_device * dev,u32 addr)109 int eprom_read(struct net_device *dev, u32 addr)
110 {
111 struct r8192_priv *priv = ieee80211_priv(dev);
112 short read_cmd[] = {1, 1, 0};
113 short addr_str[8];
114 int i;
115 int addr_len;
116 u32 ret;
117 int err;
118
119 ret = 0;
120 /* enable EPROM programming */
121 write_nic_byte_E(dev, EPROM_CMD,
122 (EPROM_CMD_PROGRAM<<EPROM_CMD_OPERATING_MODE_SHIFT));
123 force_pci_posting(dev);
124 udelay(EPROM_DELAY);
125
126 if (priv->epromtype == EPROM_93c56) {
127 addr_str[7] = addr & 1;
128 addr_str[6] = addr & (1<<1);
129 addr_str[5] = addr & (1<<2);
130 addr_str[4] = addr & (1<<3);
131 addr_str[3] = addr & (1<<4);
132 addr_str[2] = addr & (1<<5);
133 addr_str[1] = addr & (1<<6);
134 addr_str[0] = addr & (1<<7);
135 addr_len = 8;
136 } else {
137 addr_str[5] = addr & 1;
138 addr_str[4] = addr & (1<<1);
139 addr_str[3] = addr & (1<<2);
140 addr_str[2] = addr & (1<<3);
141 addr_str[1] = addr & (1<<4);
142 addr_str[0] = addr & (1<<5);
143 addr_len = 6;
144 }
145 eprom_cs(dev, 1);
146 eprom_ck_cycle(dev);
147 eprom_send_bits_string(dev, read_cmd, 3);
148 eprom_send_bits_string(dev, addr_str, addr_len);
149
150 /*
151 * keep chip pin D to low state while reading.
152 * I'm unsure if it is necessary, but anyway shouldn't hurt
153 */
154 eprom_w(dev, 0);
155
156 for (i = 0; i < 16; i++) {
157 /* eeprom needs a clk cycle between writing opcode&adr
158 * and reading data. (eeprom outs a dummy 0)
159 */
160 eprom_ck_cycle(dev);
161 err = eprom_r(dev);
162 if (err < 0)
163 return err;
164
165 ret |= err<<(15-i);
166 }
167
168 eprom_cs(dev, 0);
169 eprom_ck_cycle(dev);
170
171 /* disable EPROM programming */
172 write_nic_byte_E(dev, EPROM_CMD,
173 (EPROM_CMD_NORMAL<<EPROM_CMD_OPERATING_MODE_SHIFT));
174 return ret;
175 }
176
