drivers/staging/rtl8192e/r8180_93cx6.c

   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
  23 static void eprom_cs(struct net_device *dev, short bit)
  24 {
  25         if (bit)
  26                 write_nic_byte(dev, EPROM_CMD,
  27                                (1<<EPROM_CS_SHIFT) |
  28                                read_nic_byte(dev, EPROM_CMD)); //enable EPROM
  29         else
  30                 write_nic_byte(dev, EPROM_CMD, read_nic_byte(dev, EPROM_CMD)
  31                                &~(1<<EPROM_CS_SHIFT)); //disable EPROM
  32
  33         udelay(EPROM_DELAY);
  34 }
  35
  36
  37 static void eprom_ck_cycle(struct net_device *dev)
  38 {
  39         write_nic_byte(dev, EPROM_CMD,
  40                        (1<<EPROM_CK_SHIFT) | read_nic_byte(dev, EPROM_CMD));
  41         udelay(EPROM_DELAY);
  42         write_nic_byte(dev, EPROM_CMD,
  43                        read_nic_byte(dev, EPROM_CMD) & ~(1<<EPROM_CK_SHIFT));
  44         udelay(EPROM_DELAY);
  45 }
  46
  47
  48 static void eprom_w(struct net_device *dev, short bit)
  49 {
  50         if (bit)
  51                 write_nic_byte(dev, EPROM_CMD, (1<<EPROM_W_SHIFT) |
  52                                read_nic_byte(dev, EPROM_CMD));
  53         else
  54                 write_nic_byte(dev, EPROM_CMD, read_nic_byte(dev, EPROM_CMD)
  55                                &~(1<<EPROM_W_SHIFT));
  56
  57         udelay(EPROM_DELAY);
  58 }
  59
  60
  61 static short eprom_r(struct net_device *dev)
  62 {
  63         short bit;
  64
  65         bit = (read_nic_byte(dev, EPROM_CMD) & (1<<EPROM_R_SHIFT));
  66         udelay(EPROM_DELAY);
  67
  68         if (bit)
  69                 return 1;
  70         return 0;
  71 }
  72
  73
  74 static void eprom_send_bits_string(struct net_device *dev, short b[], int len)
  75 {
  76         int i;
  77
  78         for (i = 0; i < len; i++) {
  79                 eprom_w(dev, b[i]);
  80                 eprom_ck_cycle(dev);
  81         }
  82 }
  83
  84
  85 u32 eprom_read(struct net_device *dev, u32 addr)
  86 {
  87         struct r8192_priv *priv = ieee80211_priv(dev);
  88         short read_cmd[] = {1, 1, 0};
  89         short addr_str[8];
  90         int i;
  91         int addr_len;
  92         u32 ret;
  93
  94         ret = 0;
  95         //enable EPROM programming
  96         write_nic_byte(dev, EPROM_CMD,
  97                        (EPROM_CMD_PROGRAM<<EPROM_CMD_OPERATING_MODE_SHIFT));
  98         udelay(EPROM_DELAY);
  99
 100         if (priv->epromtype == EPROM_93c56) {
 101                 addr_str[7] = addr & 1;
 102                 addr_str[6] = addr & (1<<1);
 103                 addr_str[5] = addr & (1<<2);
 104                 addr_str[4] = addr & (1<<3);
 105                 addr_str[3] = addr & (1<<4);
 106                 addr_str[2] = addr & (1<<5);
 107                 addr_str[1] = addr & (1<<6);
 108                 addr_str[0] = addr & (1<<7);
 109                 addr_len = 8;
 110         } else {
 111                 addr_str[5] = addr & 1;
 112                 addr_str[4] = addr & (1<<1);
 113                 addr_str[3] = addr & (1<<2);
 114                 addr_str[2] = addr & (1<<3);
 115                 addr_str[1] = addr & (1<<4);
 116                 addr_str[0] = addr & (1<<5);
 117                 addr_len = 6;
 118         }
 119         eprom_cs(dev, 1);
 120         eprom_ck_cycle(dev);
 121         eprom_send_bits_string(dev, read_cmd, 3);
 122         eprom_send_bits_string(dev, addr_str, addr_len);
 123
 124         //keep chip pin D to low state while reading.
 125         //I'm unsure if it is necessary, but anyway shouldn't hurt
 126         eprom_w(dev, 0);
 127
 128         for (i = 0; i < 16; i++) {
 129                 //eeprom needs a clk cycle between writing opcode&adr
 130                 //and reading data. (eeprom outs a dummy 0)
 131                 eprom_ck_cycle(dev);
 132                 ret |= (eprom_r(dev)<<(15-i));
 133         }
 134
 135         eprom_cs(dev, 0);
 136         eprom_ck_cycle(dev);
 137
 138         //disable EPROM programming
 139         write_nic_byte(dev, EPROM_CMD,
 140                        (EPROM_CMD_NORMAL<<EPROM_CMD_OPERATING_MODE_SHIFT));
 141         return ret;
 142 }