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         force_pci_posting(dev);
  34         udelay(EPROM_DELAY);
  35 }
  36
  37
  38 static void eprom_ck_cycle(struct net_device *dev)
  39 {
  40         write_nic_byte(dev, EPROM_CMD,
  41                        (1<<EPROM_CK_SHIFT) | read_nic_byte(dev, EPROM_CMD));
  42         force_pci_posting(dev);
  43         udelay(EPROM_DELAY);
  44         write_nic_byte(dev, EPROM_CMD,
  45                        read_nic_byte(dev, EPROM_CMD) & ~(1<<EPROM_CK_SHIFT));
  46         force_pci_posting(dev);
  47         udelay(EPROM_DELAY);
  48 }
  49
  50
  51 static void eprom_w(struct net_device *dev, short bit)
  52 {
  53         if (bit)
  54                 write_nic_byte(dev, EPROM_CMD, (1<<EPROM_W_SHIFT) | \
  55                                read_nic_byte(dev, EPROM_CMD));
  56         else
  57                 write_nic_byte(dev, EPROM_CMD, read_nic_byte(dev, EPROM_CMD)\
  58                                &~(1<<EPROM_W_SHIFT));
  59
  60         force_pci_posting(dev);
  61         udelay(EPROM_DELAY);
  62 }
  63
  64
  65 static short eprom_r(struct net_device *dev)
  66 {
  67         short bit;
  68
  69         bit = (read_nic_byte(dev, EPROM_CMD) & (1<<EPROM_R_SHIFT));
  70         udelay(EPROM_DELAY);
  71
  72         if (bit)
  73                 return 1;
  74         return 0;
  75 }
  76
  77
  78 static void eprom_send_bits_string(struct net_device *dev, short b[], int len)
  79 {
  80         int i;
  81
  82         for (i = 0; i < len; i++) {
  83                 eprom_w(dev, b[i]);
  84                 eprom_ck_cycle(dev);
  85         }
  86 }
  87
  88
  89 u32 eprom_read(struct net_device *dev, u32 addr)
  90 {
  91         struct r8192_priv *priv = ieee80211_priv(dev);
  92         short read_cmd[] = {1, 1, 0};
  93         short addr_str[8];
  94         int i;
  95         int addr_len;
  96         u32 ret;
  97
  98         ret = 0;
  99         //enable EPROM programming
 100         write_nic_byte(dev, EPROM_CMD,
 101                        (EPROM_CMD_PROGRAM<<EPROM_CMD_OPERATING_MODE_SHIFT));
 102         force_pci_posting(dev);
 103         udelay(EPROM_DELAY);
 104
 105         if (priv->epromtype == EPROM_93c56) {
 106                 addr_str[7] = addr & 1;
 107                 addr_str[6] = addr & (1<<1);
 108                 addr_str[5] = addr & (1<<2);
 109                 addr_str[4] = addr & (1<<3);
 110                 addr_str[3] = addr & (1<<4);
 111                 addr_str[2] = addr & (1<<5);
 112                 addr_str[1] = addr & (1<<6);
 113                 addr_str[0] = addr & (1<<7);
 114                 addr_len = 8;
 115         } else {
 116                 addr_str[5] = addr & 1;
 117                 addr_str[4] = addr & (1<<1);
 118                 addr_str[3] = addr & (1<<2);
 119                 addr_str[2] = addr & (1<<3);
 120                 addr_str[1] = addr & (1<<4);
 121                 addr_str[0] = addr & (1<<5);
 122                 addr_len = 6;
 123         }
 124         eprom_cs(dev, 1);
 125         eprom_ck_cycle(dev);
 126         eprom_send_bits_string(dev, read_cmd, 3);
 127         eprom_send_bits_string(dev, addr_str, addr_len);
 128
 129         //keep chip pin D to low state while reading.
 130         //I'm unsure if it is necessary, but anyway shouldn't hurt
 131         eprom_w(dev, 0);
 132
 133         for (i = 0; i < 16; i++) {
 134                 //eeprom needs a clk cycle between writing opcode&adr
 135                 //and reading data. (eeprom outs a dummy 0)
 136                 eprom_ck_cycle(dev);
 137                 ret |= (eprom_r(dev)<<(15-i));
 138         }
 139
 140         eprom_cs(dev, 0);
 141         eprom_ck_cycle(dev);
 142
 143         //disable EPROM programming
 144         write_nic_byte(dev, EPROM_CMD,
 145                        (EPROM_CMD_NORMAL<<EPROM_CMD_OPERATING_MODE_SHIFT));
 146         return ret;
 147 }