disk/part_mac.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 /*
   8  * Support for harddisk partitions.
   9  *
  10  * To be compatible with LinuxPPC and Apple we use the standard Apple
  11  * SCSI disk partitioning scheme. For more information see:
  12  * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
  13  */
  14
  15 #include <common.h>
  16 #include <command.h>
  17 #include <memalign.h>
  18 #include <ide.h>
  19 #include "part_mac.h"
  20
  21 #ifdef CONFIG_HAVE_BLOCK_DEVICE
  22
  23 /* stdlib.h causes some compatibility problems; should fixe these! -- wd */
  24 #ifndef __ldiv_t_defined
  25 typedef struct {
  26         long int quot;          /* Quotient     */
  27         long int rem;           /* Remainder    */
  28 } ldiv_t;
  29 extern ldiv_t ldiv (long int __numer, long int __denom);
  30 # define __ldiv_t_defined       1
  31 #endif
  32
  33
  34 static int part_mac_read_ddb(struct blk_desc *dev_desc,
  35                              mac_driver_desc_t *ddb_p);
  36 static int part_mac_read_pdb(struct blk_desc *dev_desc, int part,
  37                              mac_partition_t *pdb_p);
  38
  39 /*
  40  * Test for a valid MAC partition
  41  */
  42 static int part_test_mac(struct blk_desc *dev_desc)
  43 {
  44         ALLOC_CACHE_ALIGN_BUFFER(mac_driver_desc_t, ddesc, 1);
  45         ALLOC_CACHE_ALIGN_BUFFER(mac_partition_t, mpart, 1);
  46         ulong i, n;
  47
  48         if (part_mac_read_ddb (dev_desc, ddesc)) {
  49                 /*
  50                  * error reading Driver Descriptor Block,
  51                  * or no valid Signature
  52                  */
  53                 return (-1);
  54         }
  55
  56         n = 1;  /* assuming at least one partition */
  57         for (i=1; i<=n; ++i) {
  58                 if ((blk_dread(dev_desc, i, 1, (ulong *)mpart) != 1) ||
  59                     (mpart->signature != MAC_PARTITION_MAGIC) ) {
  60                         return (-1);
  61                 }
  62                 /* update partition count */
  63                 n = mpart->map_count;
  64         }
  65         return (0);
  66 }
  67
  68 static void part_print_mac(struct blk_desc *dev_desc)
  69 {
  70         ulong i, n;
  71         ALLOC_CACHE_ALIGN_BUFFER(mac_driver_desc_t, ddesc, 1);
  72         ALLOC_CACHE_ALIGN_BUFFER(mac_partition_t, mpart, 1);
  73         ldiv_t mb, gb;
  74
  75         if (part_mac_read_ddb (dev_desc, ddesc)) {
  76                 /*
  77                  * error reading Driver Descriptor Block,
  78                  * or no valid Signature
  79                  */
  80                 return;
  81         }
  82
  83         n  = ddesc->blk_count;
  84
  85         mb = ldiv(n, ((1024 * 1024) / ddesc->blk_size)); /* MB */
  86         /* round to 1 digit */
  87         mb.rem *= 10 * ddesc->blk_size;
  88         mb.rem += 512 * 1024;
  89         mb.rem /= 1024 * 1024;
  90
  91         gb = ldiv(10 * mb.quot + mb.rem, 10240);
  92         gb.rem += 512;
  93         gb.rem /= 1024;
  94
  95
  96         printf ("Block Size=%d, Number of Blocks=%d, "
  97                 "Total Capacity: %ld.%ld MB = %ld.%ld GB\n"
  98                 "DeviceType=0x%x, DeviceId=0x%x\n\n"
  99                 "   #:                 type name"
 100                 "                   length   base       (size)\n",
 101                 ddesc->blk_size,
 102                 ddesc->blk_count,
 103                 mb.quot, mb.rem, gb.quot, gb.rem,
 104                 ddesc->dev_type, ddesc->dev_id
 105                 );
 106
 107         n = 1;  /* assuming at least one partition */
 108         for (i=1; i<=n; ++i) {
 109                 ulong bytes;
 110                 char c;
 111
 112                 printf ("%4ld: ", i);
 113                 if (blk_dread(dev_desc, i, 1, (ulong *)mpart) != 1) {
 114                         printf ("** Can't read Partition Map on %d:%ld **\n",
 115                                 dev_desc->devnum, i);
 116                         return;
 117                 }
 118
 119                 if (mpart->signature != MAC_PARTITION_MAGIC) {
 120                         printf("** Bad Signature on %d:%ld - expected 0x%04x, got 0x%04x\n",
 121                                dev_desc->devnum, i, MAC_PARTITION_MAGIC,
 122                                mpart->signature);
 123                         return;
 124                 }
 125
 126                 /* update partition count */
 127                 n = mpart->map_count;
 128
 129                 c      = 'k';
 130                 bytes  = mpart->block_count;
 131                 bytes /= (1024 / ddesc->blk_size);  /* kB; assumes blk_size == 512 */
 132                 if (bytes >= 1024) {
 133                         bytes >>= 10;
 134                         c = 'M';
 135                 }
 136                 if (bytes >= 1024) {
 137                         bytes >>= 10;
 138                         c = 'G';
 139                 }
 140
 141                 printf ("%20.32s %-18.32s %10u @ %-10u (%3ld%c)\n",
 142                         mpart->type,
 143                         mpart->name,
 144                         mpart->block_count,
 145                         mpart->start_block,
 146                         bytes, c
 147                         );
 148         }
 149
 150         return;
 151 }
 152
 153
 154 /*
 155  * Read Device Descriptor Block
 156  */
 157 static int part_mac_read_ddb(struct blk_desc *dev_desc,
 158                              mac_driver_desc_t *ddb_p)
 159 {
 160         if (blk_dread(dev_desc, 0, 1, (ulong *)ddb_p) != 1) {
 161                 debug("** Can't read Driver Descriptor Block **\n");
 162                 return (-1);
 163         }
 164
 165         if (ddb_p->signature != MAC_DRIVER_MAGIC) {
 166                 return (-1);
 167         }
 168         return (0);
 169 }
 170
 171 /*
 172  * Read Partition Descriptor Block
 173  */
 174 static int part_mac_read_pdb(struct blk_desc *dev_desc, int part,
 175                              mac_partition_t *pdb_p)
 176 {
 177         int n = 1;
 178
 179         for (;;) {
 180                 /*
 181                  * We must always read the descritpor block for
 182                  * partition 1 first since this is the only way to
 183                  * know how many partitions we have.
 184                  */
 185                 if (blk_dread(dev_desc, n, 1, (ulong *)pdb_p) != 1) {
 186                         printf ("** Can't read Partition Map on %d:%d **\n",
 187                                 dev_desc->devnum, n);
 188                         return (-1);
 189                 }
 190
 191                 if (pdb_p->signature != MAC_PARTITION_MAGIC) {
 192                         printf("** Bad Signature on %d:%d: expected 0x%04x, got 0x%04x\n",
 193                                dev_desc->devnum, n, MAC_PARTITION_MAGIC,
 194                                pdb_p->signature);
 195                         return (-1);
 196                 }
 197
 198                 if (n == part)
 199                         return (0);
 200
 201                 if ((part < 1) || (part > pdb_p->map_count)) {
 202                         printf ("** Invalid partition %d:%d [%d:1...%d:%d only]\n",
 203                                 dev_desc->devnum, part,
 204                                 dev_desc->devnum,
 205                                 dev_desc->devnum, pdb_p->map_count);
 206                         return (-1);
 207                 }
 208
 209                 /* update partition count */
 210                 n = part;
 211         }
 212
 213         /* NOTREACHED */
 214 }
 215
 216 static int part_get_info_mac(struct blk_desc *dev_desc, int part,
 217                                   disk_partition_t *info)
 218 {
 219         ALLOC_CACHE_ALIGN_BUFFER(mac_driver_desc_t, ddesc, 1);
 220         ALLOC_CACHE_ALIGN_BUFFER(mac_partition_t, mpart, 1);
 221
 222         if (part_mac_read_ddb (dev_desc, ddesc)) {
 223                 return (-1);
 224         }
 225
 226         info->blksz = ddesc->blk_size;
 227
 228         if (part_mac_read_pdb (dev_desc, part, mpart)) {
 229                 return (-1);
 230         }
 231
 232         info->start = mpart->start_block;
 233         info->size  = mpart->block_count;
 234         memcpy (info->type, mpart->type, sizeof(info->type));
 235         memcpy (info->name, mpart->name, sizeof(info->name));
 236
 237         return (0);
 238 }
 239
 240 U_BOOT_PART_TYPE(mac) = {
 241         .name           = "MAC",
 242         .part_type      = PART_TYPE_MAC,
 243         .max_entries    = MAC_ENTRY_NUMBERS,
 244         .get_info       = part_get_info_mac,
 245         .print          = part_print_mac,
 246         .test           = part_test_mac,
 247 };
 248 #endif