+++ /dev/null
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/bootmem.h>
-
-#include "check.h"
-#include "mtdpart.h"
-
-/* error message prefix */
-#define ERRP "mtd: "
-
-/* debug macro */
-#if 0
-#define dbg(x) do { printk("DEBUG-CMDLINE-PART: "); printk x; } while(0)
-#else
-#define dbg(x)
-#endif
-
-#define SECTOR_1G 0x200000 // 0x200000 * 512 = 1G
-#define FROM_OFFSET 0x2000 // 4MB
-
-/* special size referring to all the remaining space in a partition */
-#define SIZE_REMAINING UINT_MAX
-#define OFFSET_CONTINUOUS UINT_MAX
-
-struct mtd_partition{
- char *name;
- sector_t from;
- sector_t size;
-};
-struct cmdline_mtd_partition {
- struct cmdline_mtd_partition *next;
- char *mtd_id;
- int num_parts;
- struct mtd_partition *parts;
-};
-
-/* mtdpart_setup() parses into here */
-static struct cmdline_mtd_partition *partitions;
-
-/* the command line passed to mtdpart_setupd() */
-static char *cmdline;
-static int cmdline_parsed = 0;
-
-/*
- * Parse one partition definition for an MTD. Since there can be many
- * comma separated partition definitions, this function calls itself
- * recursively until no more partition definitions are found. Nice side
- * effect: the memory to keep the mtd_partition structs and the names
- * is allocated upon the last definition being found. At that point the
- * syntax has been verified ok.
- */
-static struct mtd_partition * newpart(char *s,
- char **retptr,
- int *num_parts,
- int this_part,
- unsigned char **extra_mem_ptr,
- int extra_mem_size)
-{
- struct mtd_partition *parts;
- sector_t size;
- sector_t from = OFFSET_CONTINUOUS;
- char *name;
- int name_len;
- unsigned char *extra_mem;
- char delim;
-
- /* fetch the partition size */
- if (*s == '-')
- { /* assign all remaining space to this partition */
- size = SIZE_REMAINING;
- s++;
- }
- else
- {
- size = memparse(s, &s);
- if (size < PAGE_SIZE)
- {
- printk(KERN_ERR ERRP "partition size too small (%llx)\n", size);
- return NULL;
- }
- }
-
- /* fetch partition name */
- delim = 0;
- /* check for from */
- if (*s == '@')
- {
- s++;
- from = memparse(s, &s);
- }
- /* now look for name */
- if (*s == '(')
- {
- delim = ')';
- }
-
- if (delim)
- {
- char *p;
-
- name = ++s;
- p = strchr(name, delim);
- if (!p)
- {
- printk(KERN_ERR ERRP "no closing %c found in partition name\n", delim);
- return NULL;
- }
- name_len = p - name;
- s = p + 1;
- }
- else
- {
- name = NULL;
- name_len = 13; /* Partition_000 */
- }
-
- /* record name length for memory allocation later */
- extra_mem_size += name_len + 1;
-
- /* test if more partitions are following */
- if (*s == ',')
- {
- if (size == SIZE_REMAINING)
- {
- printk(KERN_ERR ERRP "no partitions allowed after a fill-up partition\n");
- return NULL;
- }
- /* more partitions follow, parse them */
- parts = newpart(s + 1, &s, num_parts, this_part + 1,
- &extra_mem, extra_mem_size);
- if (!parts)
- return NULL;
- }
- else
- { /* this is the last partition: allocate space for all */
- int alloc_size;
-
- *num_parts = this_part + 1;
- alloc_size = *num_parts * sizeof(struct mtd_partition) +
- extra_mem_size;
- parts = kzalloc(alloc_size, GFP_KERNEL);
- if (!parts)
- {
- printk(KERN_ERR ERRP "out of memory\n");
- return NULL;
- }
- extra_mem = (unsigned char *)(parts + *num_parts);
- }
- /* enter this partition (from will be calculated later if it is zero at this point) */
- parts[this_part].size = size;
- parts[this_part].from = from;
- if (name)
- {
- strlcpy(extra_mem, name, name_len + 1);
- }
- else
- {
- sprintf(extra_mem, "Partition_%03d", this_part);
- }
- parts[this_part].name = extra_mem;
- extra_mem += name_len + 1;
-
- dbg(("partition %d: name <%s>, from %llx, size %llx\n",
- this_part,
- parts[this_part].name,
- parts[this_part].from,
- parts[this_part].size));
-
- /* return (updated) pointer to extra_mem memory */
- if (extra_mem_ptr)
- *extra_mem_ptr = extra_mem;
-
- /* return (updated) pointer command line string */
- *retptr = s;
-
- /* return partition table */
- return parts;
-}
-
-/*
- * Parse the command line.
- */
-static int mtdpart_setup_real(char *s)
-{
- cmdline_parsed = 1;
-
- for( ; s != NULL; )
- {
- struct cmdline_mtd_partition *this_mtd;
- struct mtd_partition *parts;
- int mtd_id_len;
- int num_parts;
- char *p, *mtd_id;
-
- mtd_id = s;
- /* fetch <mtd-id> */
- if (!(p = strchr(s, ':')))
- {
- dbg(( "no mtd-id\n"));
- return 0;
- }
- mtd_id_len = p - mtd_id;
-
- dbg(("parsing <%s>\n", p+1));
-
- /*
- * parse one mtd. have it reserve memory for the
- * struct cmdline_mtd_partition and the mtd-id string.
- */
- parts = newpart(p + 1, /* cmdline */
- &s, /* out: updated cmdline ptr */
- &num_parts, /* out: number of parts */
- 0, /* first partition */
- (unsigned char**)&this_mtd, /* out: extra mem */
- mtd_id_len + 1 + sizeof(*this_mtd) +
- sizeof(void*)-1 /*alignment*/);
- if(!parts)
- {
- /*
- * An error occurred. We're either:
- * a) out of memory, or
- * b) in the middle of the partition spec
- * Either way, this mtd is hosed and we're
- * unlikely to succeed in parsing any more
- */
- return 0;
- }
-
- /* align this_mtd */
- this_mtd = (struct cmdline_mtd_partition *)
- ALIGN((unsigned long)this_mtd, sizeof(void*));
- /* enter results */
- this_mtd->parts = parts;
- this_mtd->num_parts = num_parts;
- this_mtd->mtd_id = (char*)(this_mtd + 1);
- strlcpy(this_mtd->mtd_id, mtd_id, mtd_id_len + 1);
-
- /* link into chain */
- this_mtd->next = partitions;
- partitions = this_mtd;
-
- dbg(("mtdid=<%s> num_parts=<%d>\n",
- this_mtd->mtd_id, this_mtd->num_parts));
-
- /* EOS - we're done */
- if (*s == 0)
- break;
-#if 0
- /* does another spec follow? */
- if (*s != ';')
- {
- printk(KERN_ERR ERRP "bad character after partition (%c)\n", *s);
- return 0;
- }
-#endif
- s++;
- }
- return 1;
-}
-
-/*
- * Main function to be called from the MTD mapping driver/device to
- * obtain the partitioning information. At this point the command line
- * arguments will actually be parsed and turned to struct mtd_partition
- * information. It returns partitions for the requested mtd device, or
- * the first one in the chain if a NULL mtd_id is passed in.
- */
-static int parse_cmdline_partitions(sector_t n,
- struct mtd_partition **pparts,
- unsigned long origin)
-{
- unsigned long from;
- int i;
- struct cmdline_mtd_partition *part;
- const char *mtd_id = "rk29xxnand";
-
- /* parse command line */
- if (!cmdline_parsed)
- mtdpart_setup_real(cmdline);
-
- for(part = partitions; part; part = part->next)
- {
- if ((!mtd_id) || (!strcmp(part->mtd_id, mtd_id)))
- {
- for(i = 0, from = 0; i < part->num_parts; i++)
- {
- if (part->parts[i].from == OFFSET_CONTINUOUS)
- part->parts[i].from = from;
- else
- from = part->parts[i].from;
- if (part->parts[i].size == SIZE_REMAINING)
- part->parts[i].size = n - from - FROM_OFFSET;
- if (from + part->parts[i].size > n)
- {
- printk(KERN_WARNING ERRP
- "%s: partitioning exceeds flash size, truncating\n",
- part->mtd_id);
- part->parts[i].size = n - from;
- part->num_parts = i;
- }
- from += part->parts[i].size;
- }
- *pparts = kmemdup(part->parts,
- sizeof(*part->parts) * part->num_parts,
- GFP_KERNEL);
- if (!*pparts)
- return -ENOMEM;
- return part->num_parts;
- }
- }
- return 0;
-}
-
-static void rk_emmc_fix(void)
-{
- const char mode_emmc[] = " androidboot.mode=emmc";
- const char charger_emmc[] = " androidboot.charger.emmc=1";
- char *new_command_line;
- size_t saved_command_line_len = strlen(saved_command_line);
-
- if (strstr(saved_command_line, "androidboot.mode=charger")) {
- new_command_line = kzalloc(saved_command_line_len + strlen(charger_emmc) + 1, GFP_KERNEL);
- sprintf(new_command_line, "%s%s", saved_command_line, charger_emmc);
- } else {
- new_command_line = kzalloc(saved_command_line_len + strlen(mode_emmc) + 1, GFP_KERNEL);
- sprintf(new_command_line, "%s%s", saved_command_line, mode_emmc);
- }
- saved_command_line = new_command_line;
-}
-
-int mtdpart_partition(struct parsed_partitions *state)
-{
- int num_parts = 0, i;
- sector_t n = get_capacity(state->bdev->bd_disk);
- struct mtd_partition *parts = NULL;
-
- if(n < SECTOR_1G)
- return 0;
-
- if (!(state->bdev->bd_disk->flags & 2))
- return 0;
-
- cmdline = strstr(saved_command_line, "mtdparts=") + 9;
-
- num_parts = parse_cmdline_partitions(n, &parts, 0);
- if(num_parts < 0)
- return num_parts;
-
- for(i = 0; i < num_parts; i++){
- put_partition(state, i+1, parts[i].from + FROM_OFFSET, parts[i].size);
- strcpy(state->parts[i+1].info.volname, parts[i].name);
- printk(KERN_INFO "%10s: 0x%09llx -- 0x%09llx (%llu MB)\n",
- parts[i].name,
- parts[i].from * 512,
- (parts[i].from + parts[i].size) * 512,
- parts[i].size / 2048);
- }
-
- rk_emmc_fix();
-
- return 1;
-}
-
-
projects / firefly-linux-kernel-4.4.55.git / commitdiff