rtl_eeprom.c

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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 <[email protected]>, 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.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 * wlanfae <[email protected]>
******************************************************************************/
#include "rtl_core.h"
#include "rtl_eeprom.h"

static void eprom_cs(struct net_device *dev, short bit)
{
    if (bit)
        write_nic_byte(dev, EPROM_CMD,
                   (1 << EPROM_CS_SHIFT) |
                   read_nic_byte(dev, EPROM_CMD));
    else
        write_nic_byte(dev, EPROM_CMD, read_nic_byte(dev, EPROM_CMD)
                   & ~(1<<EPROM_CS_SHIFT));

    udelay(EPROM_DELAY);
}


static void eprom_ck_cycle(struct net_device *dev)
{
    write_nic_byte(dev, EPROM_CMD,
               (1<<EPROM_CK_SHIFT) | read_nic_byte(dev, EPROM_CMD));
    udelay(EPROM_DELAY);
    write_nic_byte(dev, EPROM_CMD,
               read_nic_byte(dev, EPROM_CMD) & ~(1<<EPROM_CK_SHIFT));
    udelay(EPROM_DELAY);
}


static void eprom_w(struct net_device *dev, short bit)
{
    if (bit)
        write_nic_byte(dev, EPROM_CMD, (1<<EPROM_W_SHIFT) |
                   read_nic_byte(dev, EPROM_CMD));
    else
        write_nic_byte(dev, EPROM_CMD, read_nic_byte(dev, EPROM_CMD)
                   & ~(1<<EPROM_W_SHIFT));

    udelay(EPROM_DELAY);
}


static short eprom_r(struct net_device *dev)
{
    short bit;

    bit = (read_nic_byte(dev, EPROM_CMD) & (1<<EPROM_R_SHIFT));
    udelay(EPROM_DELAY);

    if (bit)
        return 1;
    return 0;
}

static void eprom_send_bits_string(struct net_device *dev, short b[], int len)
{
    int i;

    for (i = 0; i < len; i++) {
        eprom_w(dev, b[i]);
        eprom_ck_cycle(dev);
    }
}

u32 eprom_read(struct net_device *dev, u32 addr)
{
    struct r8192_priv *priv = rtllib_priv(dev);
    short read_cmd[] = {1, 1, 0};
    short addr_str[8];
    int i;
    int addr_len;
    u32 ret;

    ret = 0;
    write_nic_byte(dev, EPROM_CMD,
               (EPROM_CMD_PROGRAM << EPROM_CMD_OPERATING_MODE_SHIFT));
    udelay(EPROM_DELAY);

    if (priv->epromtype == EEPROM_93C56) {
        addr_str[7] = addr & 1;
        addr_str[6] = addr & (1<<1);
        addr_str[5] = addr & (1<<2);
        addr_str[4] = addr & (1<<3);
        addr_str[3] = addr & (1<<4);
        addr_str[2] = addr & (1<<5);
        addr_str[1] = addr & (1<<6);
        addr_str[0] = addr & (1<<7);
        addr_len = 8;
    } else {
        addr_str[5] = addr & 1;
        addr_str[4] = addr & (1<<1);
        addr_str[3] = addr & (1<<2);
        addr_str[2] = addr & (1<<3);
        addr_str[1] = addr & (1<<4);
        addr_str[0] = addr & (1<<5);
        addr_len = 6;
    }
    eprom_cs(dev, 1);
    eprom_ck_cycle(dev);
    eprom_send_bits_string(dev, read_cmd, 3);
    eprom_send_bits_string(dev, addr_str, addr_len);

    eprom_w(dev, 0);

    for (i = 0; i < 16; i++) {
        eprom_ck_cycle(dev);
        ret |= (eprom_r(dev)<<(15-i));
    }

    eprom_cs(dev, 0);
    eprom_ck_cycle(dev);

    write_nic_byte(dev, EPROM_CMD,
               (EPROM_CMD_NORMAL<<EPROM_CMD_OPERATING_MODE_SHIFT));
    return ret;
}