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