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