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 * The full GNU General Public License is included in this distribution in the
16 * file called LICENSE.
17 *
18 * Contact Information:
19 * wlanfae <wlanfae@realtek.com>
20 ******************************************************************************/
21 #include "rtl_core.h"
22 #include "rtl_eeprom.h"
23
_rtl92e_gpio_write_bit(struct net_device * dev,int no,bool val)24 static void _rtl92e_gpio_write_bit(struct net_device *dev, int no, bool val)
25 {
26 u8 reg = rtl92e_readb(dev, EPROM_CMD);
27
28 if (val)
29 reg |= 1 << no;
30 else
31 reg &= ~(1 << no);
32
33 rtl92e_writeb(dev, EPROM_CMD, reg);
34 udelay(EPROM_DELAY);
35 }
36
_rtl92e_gpio_get_bit(struct net_device * dev,int no)37 static bool _rtl92e_gpio_get_bit(struct net_device *dev, int no)
38 {
39 u8 reg = rtl92e_readb(dev, EPROM_CMD);
40
41 return (reg >> no) & 0x1;
42 }
43
_rtl92e_eeprom_ck_cycle(struct net_device * dev)44 static void _rtl92e_eeprom_ck_cycle(struct net_device *dev)
45 {
46 _rtl92e_gpio_write_bit(dev, EPROM_CK_BIT, 1);
47 _rtl92e_gpio_write_bit(dev, EPROM_CK_BIT, 0);
48 }
49
_rtl92e_eeprom_xfer(struct net_device * dev,u16 data,int tx_len)50 static u16 _rtl92e_eeprom_xfer(struct net_device *dev, u16 data, int tx_len)
51 {
52 u16 ret = 0;
53 int rx_len = 16;
54
55 _rtl92e_gpio_write_bit(dev, EPROM_CS_BIT, 1);
56 _rtl92e_eeprom_ck_cycle(dev);
57
58 while (tx_len--) {
59 _rtl92e_gpio_write_bit(dev, EPROM_W_BIT,
60 (data >> tx_len) & 0x1);
61 _rtl92e_eeprom_ck_cycle(dev);
62 }
63
64 _rtl92e_gpio_write_bit(dev, EPROM_W_BIT, 0);
65
66 while (rx_len--) {
67 _rtl92e_eeprom_ck_cycle(dev);
68 ret |= _rtl92e_gpio_get_bit(dev, EPROM_R_BIT) << rx_len;
69 }
70
71 _rtl92e_gpio_write_bit(dev, EPROM_CS_BIT, 0);
72 _rtl92e_eeprom_ck_cycle(dev);
73
74 return ret;
75 }
76
rtl92e_eeprom_read(struct net_device * dev,u32 addr)77 u32 rtl92e_eeprom_read(struct net_device *dev, u32 addr)
78 {
79 struct r8192_priv *priv = rtllib_priv(dev);
80 u32 ret = 0;
81
82 rtl92e_writeb(dev, EPROM_CMD,
83 (EPROM_CMD_PROGRAM << EPROM_CMD_OPERATING_MODE_SHIFT));
84 udelay(EPROM_DELAY);
85
86 /* EEPROM is configured as x16 */
87 if (priv->epromtype == EEPROM_93C56)
88 ret = _rtl92e_eeprom_xfer(dev, (addr & 0xFF) | (0x6 << 8), 11);
89 else
90 ret = _rtl92e_eeprom_xfer(dev, (addr & 0x3F) | (0x6 << 6), 9);
91
92 rtl92e_writeb(dev, EPROM_CMD,
93 (EPROM_CMD_NORMAL<<EPROM_CMD_OPERATING_MODE_SHIFT));
94 return ret;
95 }
96