examples/82559_eeprom.c

   1
   2 /*
   3  * Copyright 1998-2001 by Donald Becker.
   4  * This software may be used and distributed according to the terms of
   5  * the GNU General Public License (GPL), incorporated herein by reference.
   6  * Contact the author for use under other terms.
   7  *
   8  * This program must be compiled with "-O"!
   9  * See the bottom of this file for the suggested compile-command.
  10  *
  11  * The author may be reached as becker@scyld.com, or C/O
  12  *  Scyld Computing Corporation
  13  *  410 Severn Ave., Suite 210
  14  *  Annapolis MD 21403
  15  *
  16  * Common-sense licensing statement: Using any portion of this program in
  17  * your own program means that you must give credit to the original author
  18  * and release the resulting code under the GPL.
  19  */
  20
  21 #define _PPC_STRING_H_          /* avoid unnecessary str/mem functions */
  22 #define _LINUX_STRING_H_        /* avoid unnecessary str/mem functions */
  23
  24 #include <common.h>
  25 #include <exports.h>
  26 #include <asm/io.h>
  27
  28
  29 /* Default EEPROM for i82559 */
  30 static unsigned short default_eeprom[64] = {
  31         0x0100, 0x0302, 0x0504, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
  32         0xffff, 0xffff, 0x40c0, 0x0000, 0x0000, 0xffff, 0xffff, 0xffff,
  33         0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
  34         0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
  35         0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
  36         0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
  37         0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
  38         0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff
  39 };
  40
  41 static unsigned short eeprom[256];
  42
  43 static int eeprom_size = 64;
  44 static int eeprom_addr_size = 6;
  45
  46 static int debug = 0;
  47
  48 static inline unsigned short swap16(unsigned short x)
  49 {
  50         return (((x & 0xff) << 8) | ((x & 0xff00) >> 8));
  51 }
  52
  53
  54 static inline void *memcpy(void *dst, const void *src, unsigned int len)
  55 {
  56         void * ret = dst;
  57         while (len-- > 0) *((char *)dst)++ = *((char *)src)++;
  58         return ret;
  59 }
  60
  61 /* The EEPROM commands include the alway-set leading bit. */
  62 #define EE_WRITE_CMD    (5)
  63 #define EE_READ_CMD             (6)
  64 #define EE_ERASE_CMD    (7)
  65
  66 /* Serial EEPROM section. */
  67 #define EE_SHIFT_CLK    0x01    /* EEPROM shift clock. */
  68 #define EE_CS                   0x02    /* EEPROM chip select. */
  69 #define EE_DATA_WRITE   0x04    /* EEPROM chip data in. */
  70 #define EE_DATA_READ    0x08    /* EEPROM chip data out. */
  71 #define EE_ENB                  (0x4800 | EE_CS)
  72 #define EE_WRITE_0              0x4802
  73 #define EE_WRITE_1              0x4806
  74 #define EE_OFFSET               14
  75
  76 /* Delay between EEPROM clock transitions. */
  77 #define eeprom_delay(ee_addr)   inw(ee_addr)
  78
  79 /* Wait for the EEPROM to finish the previous operation. */
  80 static int eeprom_busy_poll(long ee_ioaddr)
  81 {
  82         int i;
  83         outw(EE_ENB, ee_ioaddr);
  84         for (i = 0; i < 10000; i++)                     /* Typical 2000 ticks */
  85                 if (inw(ee_ioaddr) & EE_DATA_READ)
  86                         break;
  87         return i;
  88 }
  89
  90 /* This executes a generic EEPROM command, typically a write or write enable.
  91    It returns the data output from the EEPROM, and thus may also be used for
  92    reads. */
  93 static int do_eeprom_cmd(long ioaddr, int cmd, int cmd_len)
  94 {
  95         unsigned retval = 0;
  96         long ee_addr = ioaddr + EE_OFFSET;
  97
  98         if (debug > 1)
  99                 printf(" EEPROM op 0x%x: ", cmd);
 100
 101         outw(EE_ENB | EE_SHIFT_CLK, ee_addr);
 102
 103         /* Shift the command bits out. */
 104         do {
 105                 short dataval = (cmd & (1 << cmd_len)) ? EE_WRITE_1 : EE_WRITE_0;
 106                 outw(dataval, ee_addr);
 107                 eeprom_delay(ee_addr);
 108                 if (debug > 2)
 109                         printf("%X", inw(ee_addr) & 15);
 110                 outw(dataval | EE_SHIFT_CLK, ee_addr);
 111                 eeprom_delay(ee_addr);
 112                 retval = (retval << 1) | ((inw(ee_addr) & EE_DATA_READ) ? 1 : 0);
 113         } while (--cmd_len >= 0);
 114 #if 0
 115         outw(EE_ENB, ee_addr);
 116 #endif
 117         /* Terminate the EEPROM access. */
 118         outw(EE_ENB & ~EE_CS, ee_addr);
 119         if (debug > 1)
 120                 printf(" EEPROM result is 0x%5.5x.\n", retval);
 121         return retval;
 122 }
 123
 124 static int read_eeprom(long ioaddr, int location, int addr_len)
 125 {
 126         return do_eeprom_cmd(ioaddr, ((EE_READ_CMD << addr_len) | location)
 127                 << 16 , 3 + addr_len + 16) & 0xffff;
 128 }
 129
 130 static void write_eeprom(long ioaddr, int index, int value, int addr_len)
 131 {
 132         long ee_ioaddr = ioaddr + EE_OFFSET;
 133         int i;
 134
 135         /* Poll for previous op finished. */
 136         eeprom_busy_poll(ee_ioaddr);                    /* Typical 0 ticks */
 137         /* Enable programming modes. */
 138         do_eeprom_cmd(ioaddr, (0x4f << (addr_len-4)), 3 + addr_len);
 139         /* Do the actual write. */
 140         do_eeprom_cmd(ioaddr,
 141                                   (((EE_WRITE_CMD<<addr_len) | index)<<16) | (value & 0xffff),
 142                                   3 + addr_len + 16);
 143         /* Poll for write finished. */
 144         i = eeprom_busy_poll(ee_ioaddr);                        /* Typical 2000 ticks */
 145         if (debug)
 146                 printf(" Write finished after %d ticks.\n", i);
 147         /* Disable programming. This command is not instantaneous, so we check
 148            for busy before the next op. */
 149         do_eeprom_cmd(ioaddr, (0x40 << (addr_len-4)), 3 + addr_len);
 150         eeprom_busy_poll(ee_ioaddr);
 151 }
 152
 153 static int reset_eeprom(unsigned long ioaddr, unsigned char *hwaddr)
 154 {
 155         unsigned short checksum = 0;
 156         int size_test;
 157         int i;
 158
 159         printf("Resetting i82559 EEPROM @ 0x%08x ... ", ioaddr);
 160
 161         size_test = do_eeprom_cmd(ioaddr, (EE_READ_CMD << 8) << 16, 27);
 162         eeprom_addr_size = (size_test & 0xffe0000) == 0xffe0000 ? 8 : 6;
 163         eeprom_size = 1 << eeprom_addr_size;
 164
 165         memcpy(eeprom, default_eeprom, sizeof default_eeprom);
 166
 167         for (i = 0; i < 3; i++)
 168                 eeprom[i] = (hwaddr[i*2+1]<<8) + hwaddr[i*2];
 169
 170         /* Recalculate the checksum. */
 171         for (i = 0; i < eeprom_size - 1; i++)
 172                 checksum += eeprom[i];
 173         eeprom[i] = 0xBABA - checksum;
 174
 175         for (i = 0; i < eeprom_size; i++)
 176                 write_eeprom(ioaddr, i, eeprom[i], eeprom_addr_size);
 177
 178         for (i = 0; i < eeprom_size; i++)
 179                 if (read_eeprom(ioaddr, i, eeprom_addr_size) != eeprom[i]) {
 180                         printf("failed\n");
 181                         return 1;
 182                 }
 183
 184         printf("done\n");
 185         return 0;
 186 }
 187
 188 static unsigned int hatoi(char *p, char **errp)
 189 {
 190         unsigned int res = 0;
 191
 192         while (1) {
 193                 switch (*p) {
 194                 case 'a':
 195                 case 'b':
 196                 case 'c':
 197                 case 'd':
 198                 case 'e':
 199                 case 'f':
 200                         res |= (*p - 'a' + 10);
 201                         break;
 202                 case 'A':
 203                 case 'B':
 204                 case 'C':
 205                 case 'D':
 206                 case 'E':
 207                 case 'F':
 208                         res |= (*p - 'A' + 10);
 209                         break;
 210                 case '0':
 211                 case '1':
 212                 case '2':
 213                 case '3':
 214                 case '4':
 215                 case '5':
 216                 case '6':
 217                 case '7':
 218                 case '8':
 219                 case '9':
 220                         res |= (*p - '0');
 221                         break;
 222                 default:
 223                         if (errp) {
 224                                 *errp = p;
 225                         }
 226                 return res;
 227                 }
 228                 p++;
 229                 if (*p == 0) {
 230                         break;
 231                 }
 232                 res <<= 4;
 233         }
 234
 235         if (errp) {
 236                 *errp = NULL;
 237         }
 238
 239         return res;
 240 }
 241
 242 static unsigned char *gethwaddr(char *in, unsigned char *out)
 243 {
 244         char tmp[3];
 245         int i;
 246         char *err;
 247
 248         for (i=0;i<6;i++) {
 249                 if (in[i*3+2] == 0 && i == 5) {
 250                         out[i] = hatoi(&in[i*3], &err);
 251                         if (err) {
 252                                 return NULL;
 253                         }
 254                 } else if (in[i*3+2] == ':' && i < 5) {
 255                         tmp[0] = in[i*3];
 256                         tmp[1] = in[i*3+1];
 257                         tmp[2] = 0;
 258                         out[i] = hatoi(tmp, &err);
 259                         if (err) {
 260                                 return NULL;
 261                         }
 262                 } else {
 263                         return NULL;
 264                 }
 265         }
 266
 267         return out;
 268 }
 269
 270 static u32
 271 read_config_dword(int bus, int dev, int func, int reg)
 272 {
 273         u32 res;
 274
 275         outl(0x80000000|(bus&0xff)<<16|(dev&0x1f)<<11|(func&7)<<8|(reg&0xfc),
 276              0xcf8);
 277         res = inl(0xcfc);
 278         outl(0, 0xcf8);
 279         return res;
 280 }
 281
 282 static u16
 283 read_config_word(int bus, int dev, int func, int reg)
 284 {
 285         u32 res;
 286
 287         outl(0x80000000|(bus&0xff)<<16|(dev&0x1f)<<11|(func&7)<<8|(reg&0xfc),
 288              0xcf8);
 289         res = inw(0xcfc + (reg & 2));
 290         outl(0, 0xcf8);
 291         return res;
 292 }
 293
 294 static void
 295 write_config_word(int bus, int dev, int func, int reg, u16 data)
 296 {
 297
 298         outl(0x80000000|(bus&0xff)<<16|(dev&0x1f)<<11|(func&7)<<8|(reg&0xfc),
 299              0xcf8);
 300         outw(data, 0xcfc + (reg & 2));
 301         outl(0, 0xcf8);
 302 }
 303
 304
 305 int main (int argc, char *argv[])
 306 {
 307         unsigned char *eth_addr;
 308         char buf[6];
 309         int instance;
 310
 311         app_startup(argv);
 312         if (argc != 2) {
 313                 printf ("call with base Ethernet address\n");
 314                 return 1;
 315         }
 316
 317
 318         eth_addr = gethwaddr(argv[1], buf);
 319         if (NULL == eth_addr) {
 320                 printf ("Can not parse ethernet address\n");
 321                 return 1;
 322         }
 323         if (eth_addr[5] & 0x01) {
 324                 printf("Base Ethernet address must be even\n");
 325         }
 326
 327
 328         for (instance = 0; instance < 2; instance ++)  {
 329                 unsigned int io_addr;
 330                 unsigned char mac[6];
 331                 int bar1 = read_config_dword(0, 6+instance, 0, 0x14);
 332                 if (! (bar1 & 1)) {
 333                         printf("ETH%d is disabled %x\n", instance, bar1);
 334                 } else {
 335                         printf("ETH%d IO=0x%04x\n", instance, bar1 & ~3);
 336                 }
 337                 io_addr = (bar1 & (~3L));
 338
 339
 340                 write_config_word(0, 6+instance, 0, 4,
 341                                   read_config_word(0, 6+instance, 0, 4) | 1);
 342                 printf("ETH%d CMD %04x\n", instance,
 343                            read_config_word(0, 6+instance, 0, 4));
 344
 345                 memcpy(mac, eth_addr, 6);
 346                 mac[5] += instance;
 347
 348                 printf("got io=%04x, ha=%02x:%02x:%02x:%02x:%02x:%02x\n",
 349                            io_addr, mac[0], mac[1], mac[2],
 350                            mac[3], mac[4], mac[5]);
 351                 reset_eeprom(io_addr, mac);
 352         }
 353         return 0;
 354 }