Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / staging / rtl8192e / rtl8192e / rtl_eeprom.c
1 /******************************************************************************
2  * Copyright(c) 2008 - 2010 Realtek Corporation. All rights reserved.
3  *
4  * Based on the r8180 driver, which is:
5  * Copyright 2004-2005 Andrea Merello <andrea.merello@gmail.com>, et al.
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of version 2 of the GNU General Public License as
8  * published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13  * more details.
14  *
15  * You should have received a copy of the GNU General Public License along with
16  * this program; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18  *
19  * The full GNU General Public License is included in this distribution in the
20  * file called LICENSE.
21  *
22  * Contact Information:
23  * wlanfae <wlanfae@realtek.com>
24 ******************************************************************************/
25 #include "rtl_core.h"
26 #include "rtl_eeprom.h"
27
28 static void eprom_cs(struct net_device *dev, short bit)
29 {
30         if (bit)
31                 write_nic_byte(dev, EPROM_CMD,
32                                (1 << EPROM_CS_SHIFT) |
33                                read_nic_byte(dev, EPROM_CMD));
34         else
35                 write_nic_byte(dev, EPROM_CMD, read_nic_byte(dev, EPROM_CMD)
36                                & ~(1<<EPROM_CS_SHIFT));
37
38         udelay(EPROM_DELAY);
39 }
40
41
42 static void eprom_ck_cycle(struct net_device *dev)
43 {
44         write_nic_byte(dev, EPROM_CMD,
45                        (1<<EPROM_CK_SHIFT) | read_nic_byte(dev, EPROM_CMD));
46         udelay(EPROM_DELAY);
47         write_nic_byte(dev, EPROM_CMD,
48                        read_nic_byte(dev, EPROM_CMD) & ~(1<<EPROM_CK_SHIFT));
49         udelay(EPROM_DELAY);
50 }
51
52
53 static void eprom_w(struct net_device *dev, short bit)
54 {
55         if (bit)
56                 write_nic_byte(dev, EPROM_CMD, (1<<EPROM_W_SHIFT) |
57                                read_nic_byte(dev, EPROM_CMD));
58         else
59                 write_nic_byte(dev, EPROM_CMD, read_nic_byte(dev, EPROM_CMD)
60                                & ~(1<<EPROM_W_SHIFT));
61
62         udelay(EPROM_DELAY);
63 }
64
65
66 static short eprom_r(struct net_device *dev)
67 {
68         short bit;
69
70         bit = (read_nic_byte(dev, EPROM_CMD) & (1<<EPROM_R_SHIFT));
71         udelay(EPROM_DELAY);
72
73         if (bit)
74                 return 1;
75         return 0;
76 }
77
78 static void eprom_send_bits_string(struct net_device *dev, short b[], int len)
79 {
80         int i;
81
82         for (i = 0; i < len; i++) {
83                 eprom_w(dev, b[i]);
84                 eprom_ck_cycle(dev);
85         }
86 }
87
88 u32 eprom_read(struct net_device *dev, u32 addr)
89 {
90         struct r8192_priv *priv = rtllib_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         write_nic_byte(dev, EPROM_CMD,
99                        (EPROM_CMD_PROGRAM << EPROM_CMD_OPERATING_MODE_SHIFT));
100         udelay(EPROM_DELAY);
101
102         if (priv->epromtype == EEPROM_93C56) {
103                 addr_str[7] = addr & 1;
104                 addr_str[6] = addr & (1<<1);
105                 addr_str[5] = addr & (1<<2);
106                 addr_str[4] = addr & (1<<3);
107                 addr_str[3] = addr & (1<<4);
108                 addr_str[2] = addr & (1<<5);
109                 addr_str[1] = addr & (1<<6);
110                 addr_str[0] = addr & (1<<7);
111                 addr_len = 8;
112         } else {
113                 addr_str[5] = addr & 1;
114                 addr_str[4] = addr & (1<<1);
115                 addr_str[3] = addr & (1<<2);
116                 addr_str[2] = addr & (1<<3);
117                 addr_str[1] = addr & (1<<4);
118                 addr_str[0] = addr & (1<<5);
119                 addr_len = 6;
120         }
121         eprom_cs(dev, 1);
122         eprom_ck_cycle(dev);
123         eprom_send_bits_string(dev, read_cmd, 3);
124         eprom_send_bits_string(dev, addr_str, addr_len);
125
126         eprom_w(dev, 0);
127
128         for (i = 0; i < 16; i++) {
129                 eprom_ck_cycle(dev);
130                 ret |= (eprom_r(dev)<<(15-i));
131         }
132
133         eprom_cs(dev, 0);
134         eprom_ck_cycle(dev);
135
136         write_nic_byte(dev, EPROM_CMD,
137                        (EPROM_CMD_NORMAL<<EPROM_CMD_OPERATING_MODE_SHIFT));
138         return ret;
139 }