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/******************************************************************************
* Copyright(c) 2008 - 2010 Realtek Corporation. All rights reserved.
*
* Based on the r8180 driver, which is:
* Copyright 2004-2005 Andrea Merello <andrea.merello@gmail.com>, et al.
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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.
*
* The full GNU General Public License is included in this distribution in the
* file called LICENSE.
*
* Contact Information:
* wlanfae <wlanfae@realtek.com>
*****************************************************************************/
#include "rtl_core.h"
#include "rtl_eeprom.h"
static void _rtl92e_gpio_write_bit(struct net_device *dev, int no, bool val)
{
u8 reg = rtl92e_readb(dev, EPROM_CMD);
if (val)
reg |= 1 << no;
else
reg &= ~(1 << no);
rtl92e_writeb(dev, EPROM_CMD, reg);
udelay(EPROM_DELAY);
}
static bool _rtl92e_gpio_get_bit(struct net_device *dev, int no)
{
u8 reg = rtl92e_readb(dev, EPROM_CMD);
return (reg >> no) & 0x1;
}
static void _rtl92e_eeprom_ck_cycle(struct net_device *dev)
{
_rtl92e_gpio_write_bit(dev, EPROM_CK_BIT, 1);
_rtl92e_gpio_write_bit(dev, EPROM_CK_BIT, 0);
}
static u16 _rtl92e_eeprom_xfer(struct net_device *dev, u16 data, int tx_len)
{
u16 ret = 0;
int rx_len = 16;
_rtl92e_gpio_write_bit(dev, EPROM_CS_BIT, 1);
_rtl92e_eeprom_ck_cycle(dev);
while (tx_len--) {
_rtl92e_gpio_write_bit(dev, EPROM_W_BIT,
(data >> tx_len) & 0x1);
_rtl92e_eeprom_ck_cycle(dev);
}
_rtl92e_gpio_write_bit(dev, EPROM_W_BIT, 0);
while (rx_len--) {
_rtl92e_eeprom_ck_cycle(dev);
ret |= _rtl92e_gpio_get_bit(dev, EPROM_R_BIT) << rx_len;
}
_rtl92e_gpio_write_bit(dev, EPROM_CS_BIT, 0);
_rtl92e_eeprom_ck_cycle(dev);
return ret;
}
u32 rtl92e_eeprom_read(struct net_device *dev, u32 addr)
{
struct r8192_priv *priv = rtllib_priv(dev);
u32 ret = 0;
rtl92e_writeb(dev, EPROM_CMD,
(EPROM_CMD_PROGRAM << EPROM_CMD_OPERATING_MODE_SHIFT));
udelay(EPROM_DELAY);
/* EEPROM is configured as x16 */
if (priv->epromtype == EEPROM_93C56)
ret = _rtl92e_eeprom_xfer(dev, (addr & 0xFF) | (0x6 << 8), 11);
else
ret = _rtl92e_eeprom_xfer(dev, (addr & 0x3F) | (0x6 << 6), 9);
rtl92e_writeb(dev, EPROM_CMD,
(EPROM_CMD_NORMAL<<EPROM_CMD_OPERATING_MODE_SHIFT));
return ret;
}
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