block/partitions/rk.c

   1 #include <linux/kernel.h>
   2 #include <linux/slab.h>
   3 #include <linux/bootmem.h>
   4 #include "check.h"
   5 #include "rk.h"
   6
   7 /* rkpart_setup() parses into here */
   8 static struct cmdline_rk_partition *partitions;
   9 /* the command line passed to mtdpart_setupd() */
  10 static char *cmdline;
  11 static int cmdline_parsed;
  12
  13 /*
  14  * Parse one partition definition for an rkpart. Since there can be many
  15  * comma separated partition definitions, this function calls itself
  16  * recursively until no more partition definitions are found. Nice side
  17  * effect: the memory to keep the rk_partition structs and the names
  18  * is allocated upon the last definition being found. At that point the
  19  * syntax has been verified ok.
  20  */
  21 static struct rk_partition *newpart(char *s,
  22                                         char **retptr,
  23                                         int *num_parts,
  24                                         int this_part,
  25                                         unsigned char **extra_mem_ptr,
  26                                         int extra_mem_size)
  27 {
  28         struct rk_partition *parts;
  29         sector_t size;
  30         sector_t from = OFFSET_CONTINUOUS;
  31         char *name;
  32         int name_len;
  33         unsigned char *extra_mem;
  34         char delim;
  35
  36         /* fetch the partition size */
  37         if (*s == '-')
  38         {       /* assign all remaining space to this partition */
  39                 size = SIZE_REMAINING;
  40                 s++;
  41         }
  42         else
  43         {
  44                 size = memparse(s, &s);
  45                 /* No sense support partition less than 8B */
  46                 if (size < ((PAGE_SIZE) >> 9))
  47                 {
  48                         printk(KERN_ERR ERRP "partition size too small (%llx)\n", (u64)size);
  49                         return NULL;
  50                 }
  51         }
  52
  53         /* fetch partition name */
  54         delim = 0;
  55         /* check for from */
  56         if (*s == '@')
  57         {
  58                 s++;
  59                 from = memparse(s, &s);
  60         }
  61         /* now look for name */
  62         if (*s == '(')
  63         {
  64                 delim = ')';
  65         }
  66
  67         if (delim)
  68         {
  69                 char *p;
  70
  71                 name = ++s;
  72                 p = strchr(name, delim);
  73                 if (!p)
  74                 {
  75                         printk(KERN_ERR ERRP "no closing %c found in partition name\n", delim);
  76                         return NULL;
  77                 }
  78                 name_len = p - name;
  79                 s = p + 1;
  80         }
  81         else
  82         {
  83                 name = NULL;
  84                 name_len = 13; /* Partition_000 */
  85         }
  86
  87         /* record name length for memory allocation later */
  88         extra_mem_size += name_len + 1;
  89
  90         /* test if more partitions are following */
  91         if (*s == ',')
  92         {
  93                 if (size == SIZE_REMAINING)
  94                 {
  95                         printk(KERN_ERR ERRP "no partitions allowed after a fill-up partition\n");
  96                         return NULL;
  97                 }
  98                 /* more partitions follow, parse them */
  99                 parts = newpart(s + 1, &s, num_parts, this_part + 1,
 100                                 &extra_mem, extra_mem_size);
 101                 if (!parts)
 102                         return NULL;
 103         }
 104         else
 105         {       /* this is the last partition: allocate space for all */
 106                 int alloc_size;
 107
 108                 *num_parts = this_part + 1;
 109                 alloc_size = *num_parts * sizeof(struct rk_partition) +
 110                              extra_mem_size;
 111                 parts = kzalloc(alloc_size, GFP_KERNEL);
 112                 if (!parts)
 113                 {
 114                         printk(KERN_ERR ERRP "out of memory\n");
 115                         return NULL;
 116                 }
 117                 extra_mem = (unsigned char *)(parts + *num_parts);
 118         }
 119         /* enter this partition (from will be calculated later if it is zero at this point) */
 120         parts[this_part].size = size;
 121         parts[this_part].from = from;
 122         if (name)
 123         {
 124                 strlcpy(extra_mem, name, name_len + 1);
 125         }
 126         else
 127         {
 128                 sprintf(extra_mem, "Partition_%03d", this_part);
 129         }
 130         parts[this_part].name = extra_mem;
 131         extra_mem += name_len + 1;
 132
 133         dbg(("partition %d: name <%s>, from %llx, size %llx\n",
 134              this_part,
 135              parts[this_part].name,
 136              parts[this_part].from,
 137              parts[this_part].size));
 138
 139         /* return (updated) pointer to extra_mem memory */
 140         if (extra_mem_ptr)
 141           *extra_mem_ptr = extra_mem;
 142
 143         /* return (updated) pointer command line string */
 144         *retptr = s;
 145
 146         /* return partition table */
 147         return parts;
 148 }
 149
 150 /*
 151  * Parse the command line.
 152  */
 153 static int rkpart_setup_real(char *s)
 154 {
 155         cmdline_parsed = 1;
 156
 157         for( ; s != NULL; )
 158         {
 159                 struct cmdline_rk_partition *this_rk;
 160                 struct rk_partition *parts;
 161                 int rk_id_len;
 162                 int num_parts;
 163                 char *p, *rk_id;
 164
 165                 rk_id = s;
 166                 /* fetch <rk-id> */
 167                 if (!(p = strchr(s, ':')))
 168                 {
 169                         dbg(( "no rk-id\n"));
 170                         return 0;
 171                 }
 172                 rk_id_len = p - rk_id;
 173
 174                 dbg(("parsing <%s>\n", p + 1));
 175
 176                 /*
 177                  * parse one mtd. have it reserve memory for the
 178                  * struct cmdline_mtd_partition and the mtd-id string.
 179                  */
 180                 parts = newpart(p + 1,          /* cmdline */
 181                                 &s,             /* out: updated cmdline ptr */
 182                                 &num_parts,     /* out: number of parts */
 183                                 0,              /* first partition */
 184                                 (unsigned char**)&this_rk, /* out: extra mem */
 185                                 rk_id_len + 1 + sizeof(*this_rk) +
 186                                 sizeof(void*)-1 /*alignment*/);
 187                 if(!parts)
 188                 {
 189                         /*
 190                          * An error occurred. We're either:
 191                          * a) out of memory, or
 192                          * b) in the middle of the partition spec
 193                          * Either way, this mtd is hosed and we're
 194                          * unlikely to succeed in parsing any more
 195                          */
 196                          return 0;
 197                  }
 198
 199                 /* align this_rk */
 200                 this_rk = (struct cmdline_rk_partition *)
 201                         ALIGN((unsigned long)this_rk, sizeof(void*));
 202                 /* enter results */
 203                 this_rk->parts = parts;
 204                 this_rk->num_parts = num_parts;
 205                 this_rk->rk_id = (char*)(this_rk + 1);
 206                 strlcpy(this_rk->rk_id, rk_id, rk_id_len + 1);
 207
 208                 /* link into chain */
 209                 this_rk->next = partitions;
 210                 partitions = this_rk;
 211
 212                 dbg(("rkid=<%s> num_parts=<%d>\n",
 213                      this_rk->mtd_id, this_rk->num_parts));
 214
 215                 /* EOS - we're done */
 216                 if (*s == 0)
 217                         break;
 218                 s++;
 219         }
 220         return 1;
 221 }
 222
 223 /*
 224  * Main function to be called from the MTD mapping driver/device to
 225  * obtain the partitioning information. At this point the command line
 226  * arguments will actually be parsed and turned to struct mtd_partition
 227  * information. It returns partitions for the requested mtd device, or
 228  * the first one in the chain if a NULL mtd_id is passed in.
 229  */
 230 static int parse_cmdline_partitions(sector_t n,
 231                                     struct rk_partition **pparts,
 232                                     unsigned long origin)
 233 {
 234         unsigned long from;
 235         int i;
 236         struct cmdline_rk_partition *part;
 237         /* Fixme: parameter should be coherence with part table id */
 238         const char *rk_id = "rk29xxnand";
 239
 240         /* parse command line */
 241         if (!cmdline_parsed)
 242                 rkpart_setup_real(cmdline);
 243
 244         for(part = partitions; part; part = part->next)
 245         {
 246                 if ((!rk_id) || (!strcmp(part->rk_id, rk_id)))
 247                 {
 248                         for(i = 0, from = 0; i < part->num_parts; i++)
 249                         {
 250                                 if (part->parts[i].from == OFFSET_CONTINUOUS)
 251                                   part->parts[i].from = from;
 252                                 else
 253                                   from = part->parts[i].from;
 254                                 if (part->parts[i].size == SIZE_REMAINING)
 255                                   part->parts[i].size = n - from - FROM_OFFSET;
 256                                 if (from + part->parts[i].size > n)
 257                                 {
 258                                         printk(KERN_WARNING ERRP
 259                                                "%s: partitioning exceeds flash size, truncating\n",
 260                                                part->rk_id);
 261                                         part->parts[i].size = n - from;
 262                                         part->num_parts = i;
 263                                 }
 264                                 from += part->parts[i].size;
 265                         }
 266                         *pparts = kmemdup(part->parts,
 267                                         sizeof(*part->parts) * part->num_parts,
 268                                         GFP_KERNEL);
 269                         if (!*pparts)
 270                                 return -ENOMEM;
 271                         return part->num_parts;
 272                 }
 273         }
 274         return 0;
 275 }
 276
 277 static void rkpart_bootmode_fixup(void)
 278 {
 279         const char mode[] = " androidboot.mode=emmc";
 280         const char charger[] = " androidboot.charger.emmc=1";
 281         char *new_command_line;
 282         size_t saved_command_line_len = strlen(saved_command_line);
 283
 284         if (strstr(saved_command_line, "androidboot.mode=charger")) {
 285                 new_command_line = kzalloc(saved_command_line_len + strlen(charger) + 1, GFP_KERNEL);
 286                 sprintf(new_command_line, "%s%s", saved_command_line, charger);
 287         } else {
 288                 new_command_line = kzalloc(saved_command_line_len + strlen(mode) + 1, GFP_KERNEL);
 289                 sprintf(new_command_line, "%s%s", saved_command_line, mode);
 290         }
 291         saved_command_line = new_command_line;
 292 }
 293
 294 int rkpart_partition(struct parsed_partitions *state)
 295 {
 296         int num_parts = 0, i;
 297         sector_t n = get_capacity(state->bdev->bd_disk);
 298         struct rk_partition *parts = NULL;
 299
 300         if (n < SECTOR_1G)
 301                 return 0;
 302
 303         /* ONLY be used by eMMC-disk */
 304         if (1 != state->bdev->bd_disk->emmc_disk)
 305                 return 0;
 306
 307         /* Fixme: parameter should be coherence with part table */
 308         cmdline = strstr(saved_command_line, "mtdparts=");
 309         if (!cmdline)
 310                 return 0;
 311         cmdline += 9;
 312         cmdline_parsed = 0;
 313
 314         num_parts = parse_cmdline_partitions(n, &parts, 0);
 315         if (num_parts < 0)
 316                 return num_parts;
 317
 318         for (i = 0; i < num_parts; i++) {
 319                 put_partition(  state,
 320                                 i+1,
 321                                 parts[i].from + FROM_OFFSET,
 322                                 parts[i].size);
 323                 strcpy(state->parts[i+1].info.volname, parts[i].name);
 324                 printk(KERN_INFO "%10s: 0x%09llx -- 0x%09llx (%llu MB)\n",
 325                                 parts[i].name,
 326                                 (u64)parts[i].from * 512,
 327                                 (u64)(parts[i].from + parts[i].size) * 512,
 328                                 (u64)parts[i].size / 2048);
 329         }
 330
 331         rkpart_bootmode_fixup();
 332
 333         return 1;
 334 }
 335
 336