LXR linux/drivers/staging/rtl8192su/r8180

   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  <andreamrl@tiscali.it>
   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 tanks the Authors of those projects and the Ndiswrapper
  18   project Authors.
  19*/
  20
  21#include "r8180_93cx6.h"
  22
  23void eprom_cs(struct net_device *dev, short bit)
  24{
  25        if(bit)
  26                write_nic_byte_E(dev, EPROM_CMD,
  27                               (1<<EPROM_CS_SHIFT) | \
  28                               read_nic_byte_E(dev, EPROM_CMD)); //enable EPROM
  29        else
  30                write_nic_byte_E(dev, EPROM_CMD, read_nic_byte_E(dev, EPROM_CMD)\
  31                               &~(1<<EPROM_CS_SHIFT)); //disable EPROM
  32
  33        force_pci_posting(dev);
  34        udelay(EPROM_DELAY);
  35}
  36
  37
  38void eprom_ck_cycle(struct net_device *dev)
  39{
  40        write_nic_byte_E(dev, EPROM_CMD,
  41                       (1<<EPROM_CK_SHIFT) | read_nic_byte_E(dev,EPROM_CMD));
  42        force_pci_posting(dev);
  43        udelay(EPROM_DELAY);
  44        write_nic_byte_E(dev, EPROM_CMD,
  45                       read_nic_byte_E(dev, EPROM_CMD) &~ (1<<EPROM_CK_SHIFT));
  46        force_pci_posting(dev);
  47        udelay(EPROM_DELAY);
  48}
  49
  50
  51void eprom_w(struct net_device *dev,short bit)
  52{
  53        if(bit)
  54                write_nic_byte_E(dev, EPROM_CMD, (1<<EPROM_W_SHIFT) | \
  55                               read_nic_byte_E(dev,EPROM_CMD));
  56        else
  57                write_nic_byte_E(dev, EPROM_CMD, read_nic_byte_E(dev,EPROM_CMD)\
  58                               &~(1<<EPROM_W_SHIFT));
  59
  60        force_pci_posting(dev);
  61        udelay(EPROM_DELAY);
  62}
  63
  64
  65short eprom_r(struct net_device *dev)
  66{
  67        short bit;
  68
  69        bit=(read_nic_byte_E(dev, EPROM_CMD) & (1<<EPROM_R_SHIFT) );
  70        udelay(EPROM_DELAY);
  71
  72        if(bit) return 1;
  73        return 0;
  74}
  75
  76
  77void eprom_send_bits_string(struct net_device *dev, short b[], int len)
  78{
  79        int i;
  80
  81        for(i=0; i<len; i++){
  82                eprom_w(dev, b[i]);
  83                eprom_ck_cycle(dev);
  84        }
  85}
  86
  87
  88u32 eprom_read(struct net_device *dev, u32 addr)
  89{
  90        struct r8192_priv *priv = ieee80211_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        //enable EPROM programming
  99        write_nic_byte_E(dev, EPROM_CMD,
 100                       (EPROM_CMD_PROGRAM<<EPROM_CMD_OPERATING_MODE_SHIFT));
 101        force_pci_posting(dev);
 102        udelay(EPROM_DELAY);
 103
 104        if (priv->epromtype==EPROM_93c56){
 105                addr_str[7]=addr & 1;
 106                addr_str[6]=addr & (1<<1);
 107                addr_str[5]=addr & (1<<2);
 108                addr_str[4]=addr & (1<<3);
 109                addr_str[3]=addr & (1<<4);
 110                addr_str[2]=addr & (1<<5);
 111                addr_str[1]=addr & (1<<6);
 112                addr_str[0]=addr & (1<<7);
 113                addr_len=8;
 114        }else{
 115                addr_str[5]=addr & 1;
 116                addr_str[4]=addr & (1<<1);
 117                addr_str[3]=addr & (1<<2);
 118                addr_str[2]=addr & (1<<3);
 119                addr_str[1]=addr & (1<<4);
 120                addr_str[0]=addr & (1<<5);
 121                addr_len=6;
 122        }
 123        eprom_cs(dev, 1);
 124        eprom_ck_cycle(dev);
 125        eprom_send_bits_string(dev, read_cmd, 3);
 126        eprom_send_bits_string(dev, addr_str, addr_len);
 127
 128        //keep chip pin D to low state while reading.
 129        //I'm unsure if it is necessary, but anyway shouldn't hurt
 130        eprom_w(dev, 0);
 131
 132        for(i=0;i<16;i++){
 133                //eeprom needs a clk cycle between writing opcode&adr
 134                //and reading data. (eeprom outs a dummy 0)
 135                eprom_ck_cycle(dev);
 136                ret |= (eprom_r(dev)<<(15-i));
 137        }
 138
 139        eprom_cs(dev, 0);
 140        eprom_ck_cycle(dev);
 141
 142        //disable EPROM programming
 143        write_nic_byte_E(dev, EPROM_CMD,
 144                       (EPROM_CMD_NORMAL<<EPROM_CMD_OPERATING_MODE_SHIFT));
 145        return ret;
 146}
 147