examples/eepro100_eeprom.c

   1 /*
   2  * Copyright 1998-2001 by Donald Becker.
   3  * This software may be used and distributed according to the terms of
   4  * the GNU General Public License (GPL), incorporated herein by reference.
   5  * Contact the author for use under other terms.
   6  *
   7  * This program must be compiled with "-O"!
   8  * See the bottom of this file for the suggested compile-command.
   9  *
  10  * The author may be reached as becker@scyld.com, or C/O
  11  *  Scyld Computing Corporation
  12  *  410 Severn Ave., Suite 210
  13  *  Annapolis MD 21403
  14  *
  15  * Common-sense licensing statement: Using any portion of this program in
  16  * your own program means that you must give credit to the original author
  17  * and release the resulting code under the GPL.
  18  */
  19
  20 /* avoid unnecessary memcpy function */
  21 #define __HAVE_ARCH_MEMCPY
  22 #define _PPC_STRING_H_
  23
  24 #include <common.h>
  25 #include <exports.h>
  26
  27 static int reset_eeprom(unsigned long ioaddr, unsigned char *hwaddr);
  28
  29 int eepro100_eeprom(int argc, char *argv[])
  30 {
  31         int ret = 0;
  32
  33         unsigned char hwaddr1[6] = { 0x00, 0x00, 0x02, 0x03, 0x04, 0x05 };
  34         unsigned char hwaddr2[6] = { 0x00, 0x00, 0x02, 0x03, 0x04, 0x06 };
  35
  36         app_startup(argv);
  37
  38 #if defined(CONFIG_OXC)
  39         ret |= reset_eeprom(0x80000000, hwaddr1);
  40         ret |= reset_eeprom(0x81000000, hwaddr2);
  41 #endif
  42
  43         return ret;
  44 }
  45
  46 /* Default EEPROM for i82559 */
  47 static unsigned short default_eeprom[64] = {
  48         0x0100, 0x0302, 0x0504, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
  49         0xffff, 0xffff, 0x40c0, 0x0000, 0x0000, 0xffff, 0xffff, 0xffff,
  50         0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
  51         0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
  52         0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
  53         0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
  54         0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
  55         0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff
  56 };
  57
  58 static unsigned short eeprom[256];
  59
  60 static int eeprom_size = 64;
  61 static int eeprom_addr_size = 6;
  62
  63 static int debug = 0;
  64
  65 static inline unsigned short swap16(unsigned short x)
  66 {
  67         return (((x & 0xff) << 8) | ((x & 0xff00) >> 8));
  68 }
  69
  70 static inline void outw(short data, long addr)
  71 {
  72         *(volatile short *)(addr) = swap16(data);
  73 }
  74
  75 static inline short inw(long addr)
  76 {
  77         return swap16(*(volatile short *)(addr));
  78 }
  79
  80 static inline void *memcpy(void *dst, const void *src, unsigned int len)
  81 {
  82         char *ret = dst;
  83         while (len-- > 0) {
  84                 *ret++ = *((char *)src);
  85                 src++;
  86         }
  87         return (void *)ret;
  88 }
  89
  90 /* The EEPROM commands include the alway-set leading bit. */
  91 #define EE_WRITE_CMD    (5)
  92 #define EE_READ_CMD             (6)
  93 #define EE_ERASE_CMD    (7)
  94
  95 /* Serial EEPROM section. */
  96 #define EE_SHIFT_CLK    0x01    /* EEPROM shift clock. */
  97 #define EE_CS                   0x02    /* EEPROM chip select. */
  98 #define EE_DATA_WRITE   0x04    /* EEPROM chip data in. */
  99 #define EE_DATA_READ    0x08    /* EEPROM chip data out. */
 100 #define EE_ENB                  (0x4800 | EE_CS)
 101 #define EE_WRITE_0              0x4802
 102 #define EE_WRITE_1              0x4806
 103 #define EE_OFFSET               14
 104
 105 /* Delay between EEPROM clock transitions. */
 106 #define eeprom_delay(ee_addr)   inw(ee_addr)
 107
 108 /* Wait for the EEPROM to finish the previous operation. */
 109 static int eeprom_busy_poll(long ee_ioaddr)
 110 {
 111         int i;
 112         outw(EE_ENB, ee_ioaddr);
 113         for (i = 0; i < 10000; i++)                     /* Typical 2000 ticks */
 114                 if (inw(ee_ioaddr) & EE_DATA_READ)
 115                         break;
 116         return i;
 117 }
 118
 119 /* This executes a generic EEPROM command, typically a write or write enable.
 120    It returns the data output from the EEPROM, and thus may also be used for
 121    reads. */
 122 static int do_eeprom_cmd(long ioaddr, int cmd, int cmd_len)
 123 {
 124         unsigned retval = 0;
 125         long ee_addr = ioaddr + EE_OFFSET;
 126
 127         if (debug > 1)
 128                 printf(" EEPROM op 0x%x: ", cmd);
 129
 130         outw(EE_ENB | EE_SHIFT_CLK, ee_addr);
 131
 132         /* Shift the command bits out. */
 133         do {
 134                 short dataval = (cmd & (1 << cmd_len)) ? EE_WRITE_1 : EE_WRITE_0;
 135                 outw(dataval, ee_addr);
 136                 eeprom_delay(ee_addr);
 137                 if (debug > 2)
 138                         printf("%X", inw(ee_addr) & 15);
 139                 outw(dataval | EE_SHIFT_CLK, ee_addr);
 140                 eeprom_delay(ee_addr);
 141                 retval = (retval << 1) | ((inw(ee_addr) & EE_DATA_READ) ? 1 : 0);
 142         } while (--cmd_len >= 0);
 143 #if 0
 144         outw(EE_ENB, ee_addr);
 145 #endif
 146         /* Terminate the EEPROM access. */
 147         outw(EE_ENB & ~EE_CS, ee_addr);
 148         if (debug > 1)
 149                 printf(" EEPROM result is 0x%5.5x.\n", retval);
 150         return retval;
 151 }
 152
 153 static int read_eeprom(long ioaddr, int location, int addr_len)
 154 {
 155         return do_eeprom_cmd(ioaddr, ((EE_READ_CMD << addr_len) | location)
 156                 << 16 , 3 + addr_len + 16) & 0xffff;
 157 }
 158
 159 static void write_eeprom(long ioaddr, int index, int value, int addr_len)
 160 {
 161         long ee_ioaddr = ioaddr + EE_OFFSET;
 162         int i;
 163
 164         /* Poll for previous op finished. */
 165         eeprom_busy_poll(ee_ioaddr);                    /* Typical 0 ticks */
 166         /* Enable programming modes. */
 167         do_eeprom_cmd(ioaddr, (0x4f << (addr_len-4)), 3 + addr_len);
 168         /* Do the actual write. */
 169         do_eeprom_cmd(ioaddr,
 170                                   (((EE_WRITE_CMD<<addr_len) | index)<<16) | (value & 0xffff),
 171                                   3 + addr_len + 16);
 172         /* Poll for write finished. */
 173         i = eeprom_busy_poll(ee_ioaddr);                        /* Typical 2000 ticks */
 174         if (debug)
 175                 printf(" Write finished after %d ticks.\n", i);
 176         /* Disable programming. This command is not instantaneous, so we check
 177            for busy before the next op. */
 178         do_eeprom_cmd(ioaddr, (0x40 << (addr_len-4)), 3 + addr_len);
 179         eeprom_busy_poll(ee_ioaddr);
 180 }
 181
 182 static int reset_eeprom(unsigned long ioaddr, unsigned char *hwaddr)
 183 {
 184         unsigned short checksum = 0;
 185         int size_test;
 186         int i;
 187
 188         printf("Resetting i82559 EEPROM @ 0x%08lX ... ", ioaddr);
 189
 190         size_test = do_eeprom_cmd(ioaddr, (EE_READ_CMD << 8) << 16, 27);
 191         eeprom_addr_size = (size_test & 0xffe0000) == 0xffe0000 ? 8 : 6;
 192         eeprom_size = 1 << eeprom_addr_size;
 193
 194         memcpy(eeprom, default_eeprom, sizeof default_eeprom);
 195
 196         for (i = 0; i < 3; i++)
 197                 eeprom[i] = (hwaddr[i*2+1]<<8) + hwaddr[i*2];
 198
 199         /* Recalculate the checksum. */
 200         for (i = 0; i < eeprom_size - 1; i++)
 201                 checksum += eeprom[i];
 202         eeprom[i] = 0xBABA - checksum;
 203
 204         for (i = 0; i < eeprom_size; i++)
 205                 write_eeprom(ioaddr, i, eeprom[i], eeprom_addr_size);
 206
 207         for (i = 0; i < eeprom_size; i++)
 208                 if (read_eeprom(ioaddr, i, eeprom_addr_size) != eeprom[i]) {
 209                         printf("failed\n");
 210                         return 1;
 211                 }
 212
 213         printf("done\n");
 214         return 0;
 215 }