drivers/staging/rtl8192u/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  <andrea.merello@gmail.com>
   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 thank 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         u8 cmdreg;
  26
  27         read_nic_byte_E(dev, EPROM_CMD, &cmdreg);
  28         if (bit)
  29                 /* enable EPROM */
  30                 write_nic_byte_E(dev, EPROM_CMD, cmdreg | EPROM_CS_BIT);
  31         else
  32                 /* disable EPROM */
  33                 write_nic_byte_E(dev, EPROM_CMD, cmdreg & ~EPROM_CS_BIT);
  34
  35         force_pci_posting(dev);
  36         udelay(EPROM_DELAY);
  37 }
  38
  39
  40 static void eprom_ck_cycle(struct net_device *dev)
  41 {
  42         u8 cmdreg;
  43
  44         read_nic_byte_E(dev, EPROM_CMD, &cmdreg);
  45         write_nic_byte_E(dev, EPROM_CMD, cmdreg | EPROM_CK_BIT);
  46         force_pci_posting(dev);
  47         udelay(EPROM_DELAY);
  48
  49         read_nic_byte_E(dev, EPROM_CMD, &cmdreg);
  50         write_nic_byte_E(dev, EPROM_CMD, cmdreg & ~EPROM_CK_BIT);
  51         force_pci_posting(dev);
  52         udelay(EPROM_DELAY);
  53 }
  54
  55
  56 static void eprom_w(struct net_device *dev, short bit)
  57 {
  58         u8 cmdreg;
  59
  60         read_nic_byte_E(dev, EPROM_CMD, &cmdreg);
  61         if (bit)
  62                 write_nic_byte_E(dev, EPROM_CMD, cmdreg | EPROM_W_BIT);
  63         else
  64                 write_nic_byte_E(dev, EPROM_CMD, cmdreg & ~EPROM_W_BIT);
  65
  66         force_pci_posting(dev);
  67         udelay(EPROM_DELAY);
  68 }
  69
  70
  71 static short eprom_r(struct net_device *dev)
  72 {
  73         u8 bit;
  74
  75         read_nic_byte_E(dev, EPROM_CMD, &bit);
  76         udelay(EPROM_DELAY);
  77
  78         if (bit & EPROM_R_BIT)
  79                 return 1;
  80
  81         return 0;
  82 }
  83
  84
  85 static void eprom_send_bits_string(struct net_device *dev, short b[], int len)
  86 {
  87         int i;
  88
  89         for (i = 0; i < len; i++) {
  90                 eprom_w(dev, b[i]);
  91                 eprom_ck_cycle(dev);
  92         }
  93 }
  94
  95
  96 u32 eprom_read(struct net_device *dev, u32 addr)
  97 {
  98         struct r8192_priv *priv = ieee80211_priv(dev);
  99         short read_cmd[] = {1, 1, 0};
 100         short addr_str[8];
 101         int i;
 102         int addr_len;
 103         u32 ret;
 104
 105         ret = 0;
 106         /* enable EPROM programming */
 107         write_nic_byte_E(dev, EPROM_CMD,
 108                        (EPROM_CMD_PROGRAM<<EPROM_CMD_OPERATING_MODE_SHIFT));
 109         force_pci_posting(dev);
 110         udelay(EPROM_DELAY);
 111
 112         if (priv->epromtype == EPROM_93c56) {
 113                 addr_str[7] = addr & 1;
 114                 addr_str[6] = addr & (1<<1);
 115                 addr_str[5] = addr & (1<<2);
 116                 addr_str[4] = addr & (1<<3);
 117                 addr_str[3] = addr & (1<<4);
 118                 addr_str[2] = addr & (1<<5);
 119                 addr_str[1] = addr & (1<<6);
 120                 addr_str[0] = addr & (1<<7);
 121                 addr_len = 8;
 122         } else {
 123                 addr_str[5] = addr & 1;
 124                 addr_str[4] = addr & (1<<1);
 125                 addr_str[3] = addr & (1<<2);
 126                 addr_str[2] = addr & (1<<3);
 127                 addr_str[1] = addr & (1<<4);
 128                 addr_str[0] = addr & (1<<5);
 129                 addr_len = 6;
 130         }
 131         eprom_cs(dev, 1);
 132         eprom_ck_cycle(dev);
 133         eprom_send_bits_string(dev, read_cmd, 3);
 134         eprom_send_bits_string(dev, addr_str, addr_len);
 135
 136         /*
 137          * keep chip pin D to low state while reading.
 138          * I'm unsure if it is necessary, but anyway shouldn't hurt
 139          */
 140         eprom_w(dev, 0);
 141
 142         for (i = 0; i < 16; i++) {
 143                 /* eeprom needs a clk cycle between writing opcode&adr
 144                  * and reading data. (eeprom outs a dummy 0)
 145                  */
 146                 eprom_ck_cycle(dev);
 147                 ret |= (eprom_r(dev)<<(15-i));
 148         }
 149
 150         eprom_cs(dev, 0);
 151         eprom_ck_cycle(dev);
 152
 153         /* disable EPROM programming */
 154         write_nic_byte_E(dev, EPROM_CMD,
 155                        (EPROM_CMD_NORMAL<<EPROM_CMD_OPERATING_MODE_SHIFT));
 156         return ret;
 157 }