Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Read flash partition table from command line
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright © 2002      SYSGO Real-Time Solutions GmbH
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * The format for the command line is as follows:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * mtdparts=<mtddef>[;<mtddef]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * <mtddef>  := <mtd-id>:<partdef>[,<partdef>]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * <partdef> := <size>[@<offset>][<name>][ro][lk][slc]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * <mtd-id>  := unique name used in mapping driver/device (mtd->name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  * <size>    := standard linux memsize OR "-" to denote all remaining space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  *              size is automatically truncated at end of device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  *              if specified or truncated size is 0 the part is skipped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  * <offset>  := standard linux memsize
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  *              if omitted the part will immediately follow the previous part
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  *              or 0 if the first part
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * <name>    := '(' NAME ')'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  *              NAME will appear in /proc/mtd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * <size> and <offset> can be specified such that the parts are out of order
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  * in physical memory and may even overlap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  * The parts are assigned MTD numbers in the order they are specified in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  * command line regardless of their order in physical memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  * Examples:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  * 1 NOR Flash, with 1 single writable partition:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  * edb7312-nor:-
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  * 1 NOR Flash with 2 partitions, 1 NAND with one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  * edb7312-nor:256k(ARMboot)ro,-(root);edb7312-nand:-(home)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #define pr_fmt(fmt)	"mtd: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #include <linux/mtd/mtd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #include <linux/mtd/partitions.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) /* debug macro */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) #if 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) #define dbg(x) do { printk("DEBUG-CMDLINE-PART: "); printk x; } while(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) #define dbg(x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) /* special size referring to all the remaining space in a partition */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) #define SIZE_REMAINING ULLONG_MAX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) #define OFFSET_CONTINUOUS ULLONG_MAX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) struct cmdline_mtd_partition {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	struct cmdline_mtd_partition *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	char *mtd_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	int num_parts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	struct mtd_partition *parts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) /* mtdpart_setup() parses into here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) static struct cmdline_mtd_partition *partitions;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) /* the command line passed to mtdpart_setup() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) static char *mtdparts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) static char *cmdline;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) static int cmdline_parsed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75)  * Parse one partition definition for an MTD. Since there can be many
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76)  * comma separated partition definitions, this function calls itself
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77)  * recursively until no more partition definitions are found. Nice side
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  * effect: the memory to keep the mtd_partition structs and the names
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  * is allocated upon the last definition being found. At that point the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)  * syntax has been verified ok.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) static struct mtd_partition * newpart(char *s,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 				      char **retptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 				      int *num_parts,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 				      int this_part,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 				      unsigned char **extra_mem_ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 				      int extra_mem_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	struct mtd_partition *parts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	unsigned long long size, offset = OFFSET_CONTINUOUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	int name_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	unsigned char *extra_mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	char delim;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	unsigned int mask_flags, add_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	/* fetch the partition size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	if (*s == '-') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		/* assign all remaining space to this partition */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		size = SIZE_REMAINING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		s++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		size = memparse(s, &s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		if (!size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			pr_err("partition has size 0\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	/* fetch partition name and flags */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	mask_flags = 0; /* this is going to be a regular partition */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	add_flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	delim = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	/* check for offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if (*s == '@') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		s++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		offset = memparse(s, &s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	/* now look for name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (*s == '(')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		delim = ')';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if (delim) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		name = ++s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		p = strchr(name, delim);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		if (!p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			pr_err("no closing %c found in partition name\n", delim);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		name_len = p - name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		s = p + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		name_len = 13; /* Partition_000 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	/* record name length for memory allocation later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	extra_mem_size += name_len + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	/* test for options */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (strncmp(s, "ro", 2) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		mask_flags |= MTD_WRITEABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		s += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	/* if lk is found do NOT unlock the MTD partition*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	if (strncmp(s, "lk", 2) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		mask_flags |= MTD_POWERUP_LOCK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		s += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	/* if slc is found use emulated SLC mode on this partition*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (!strncmp(s, "slc", 3)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		add_flags |= MTD_SLC_ON_MLC_EMULATION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		s += 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	/* test if more partitions are following */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	if (*s == ',') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		if (size == SIZE_REMAINING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			pr_err("no partitions allowed after a fill-up partition\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		/* more partitions follow, parse them */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		parts = newpart(s + 1, &s, num_parts, this_part + 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 				&extra_mem, extra_mem_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		if (IS_ERR(parts))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			return parts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		/* this is the last partition: allocate space for all */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		int alloc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		*num_parts = this_part + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		alloc_size = *num_parts * sizeof(struct mtd_partition) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 			     extra_mem_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		parts = kzalloc(alloc_size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		if (!parts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		extra_mem = (unsigned char *)(parts + *num_parts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	 * enter this partition (offset will be calculated later if it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	 * OFFSET_CONTINUOUS at this point)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	parts[this_part].size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	parts[this_part].offset = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	parts[this_part].mask_flags = mask_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	parts[this_part].add_flags = add_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	if (name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		strlcpy(extra_mem, name, name_len + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		sprintf(extra_mem, "Partition_%03d", this_part);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	parts[this_part].name = extra_mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	extra_mem += name_len + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	dbg(("partition %d: name <%s>, offset %llx, size %llx, mask flags %x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	     this_part, parts[this_part].name, parts[this_part].offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	     parts[this_part].size, parts[this_part].mask_flags));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	/* return (updated) pointer to extra_mem memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	if (extra_mem_ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		*extra_mem_ptr = extra_mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	/* return (updated) pointer command line string */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	*retptr = s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	/* return partition table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	return parts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)  * Parse the command line.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) static int mtdpart_setup_real(char *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	cmdline_parsed = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	for( ; s != NULL; )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		struct cmdline_mtd_partition *this_mtd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		struct mtd_partition *parts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		int mtd_id_len, num_parts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		char *p, *mtd_id, *semicol, *open_parenth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		 * Replace the first ';' by a NULL char so strrchr can work
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		 * properly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		semicol = strchr(s, ';');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		if (semicol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			*semicol = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		 * make sure that part-names with ":" will not be handled as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		 * part of the mtd-id with an ":"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		open_parenth = strchr(s, '(');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		if (open_parenth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 			*open_parenth = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		mtd_id = s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		 * fetch <mtd-id>. We use strrchr to ignore all ':' that could
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		 * be present in the MTD name, only the last one is interpreted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		 * as an <mtd-id>/<part-definition> separator.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		p = strrchr(s, ':');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		/* Restore the '(' now. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		if (open_parenth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			*open_parenth = '(';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		/* Restore the ';' now. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		if (semicol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			*semicol = ';';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		if (!p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 			pr_err("no mtd-id\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		mtd_id_len = p - mtd_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		dbg(("parsing <%s>\n", p+1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		 * parse one mtd. have it reserve memory for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		 * struct cmdline_mtd_partition and the mtd-id string.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		parts = newpart(p + 1,		/* cmdline */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 				&s,		/* out: updated cmdline ptr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 				&num_parts,	/* out: number of parts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 				0,		/* first partition */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 				(unsigned char**)&this_mtd, /* out: extra mem */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 				mtd_id_len + 1 + sizeof(*this_mtd) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 				sizeof(void*)-1 /*alignment*/);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		if (IS_ERR(parts)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 			 * An error occurred. We're either:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			 * a) out of memory, or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 			 * b) in the middle of the partition spec
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 			 * Either way, this mtd is hosed and we're
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 			 * unlikely to succeed in parsing any more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 			 return PTR_ERR(parts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		 }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		/* align this_mtd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		this_mtd = (struct cmdline_mtd_partition *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 				ALIGN((unsigned long)this_mtd, sizeof(void *));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		/* enter results */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		this_mtd->parts = parts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		this_mtd->num_parts = num_parts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		this_mtd->mtd_id = (char*)(this_mtd + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		strlcpy(this_mtd->mtd_id, mtd_id, mtd_id_len + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		/* link into chain */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		this_mtd->next = partitions;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		partitions = this_mtd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		dbg(("mtdid=<%s> num_parts=<%d>\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		     this_mtd->mtd_id, this_mtd->num_parts));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		/* EOS - we're done */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		if (*s == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		/* does another spec follow? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		if (*s != ';') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 			pr_err("bad character after partition (%c)\n", *s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		s++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)  * Main function to be called from the MTD mapping driver/device to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)  * obtain the partitioning information. At this point the command line
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)  * arguments will actually be parsed and turned to struct mtd_partition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)  * information. It returns partitions for the requested mtd device, or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)  * the first one in the chain if a NULL mtd_id is passed in.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) static int parse_cmdline_partitions(struct mtd_info *master,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 				    const struct mtd_partition **pparts,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 				    struct mtd_part_parser_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	unsigned long long offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	int i, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	struct cmdline_mtd_partition *part;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	const char *mtd_id = master->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	/* parse command line */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	if (!cmdline_parsed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		err = mtdpart_setup_real(cmdline);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 			return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	 * Search for the partition definition matching master->name.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	 * If master->name is not set, stop at first partition definition.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	for (part = partitions; part; part = part->next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		if ((!mtd_id) || (!strcmp(part->mtd_id, mtd_id)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	if (!part)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	for (i = 0, offset = 0; i < part->num_parts; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		if (part->parts[i].offset == OFFSET_CONTINUOUS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 			part->parts[i].offset = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 			offset = part->parts[i].offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 		if (part->parts[i].size == SIZE_REMAINING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 			part->parts[i].size = master->size - offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		if (offset + part->parts[i].size > master->size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 			pr_warn("%s: partitioning exceeds flash size, truncating\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 				part->mtd_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 			part->parts[i].size = master->size - offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 		offset += part->parts[i].size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		if (part->parts[i].size == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 			pr_warn("%s: skipping zero sized partition\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 				part->mtd_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 			part->num_parts--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 			memmove(&part->parts[i], &part->parts[i + 1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 				sizeof(*part->parts) * (part->num_parts - i));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 			i--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	*pparts = kmemdup(part->parts, sizeof(*part->parts) * part->num_parts,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 			  GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	if (!*pparts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	return part->num_parts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)  * This is the handler for our kernel parameter, called from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)  * main.c::checksetup(). Note that we can not yet kmalloc() anything,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)  * so we only save the commandline for later processing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)  * This function needs to be visible for bootloaders.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) static int __init mtdpart_setup(char *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	cmdline = s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) __setup("mtdparts=", mtdpart_setup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) static struct mtd_part_parser cmdline_parser = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	.parse_fn = parse_cmdline_partitions,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	.name = "cmdlinepart",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) static int __init cmdline_parser_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	if (mtdparts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 		mtdpart_setup(mtdparts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	register_mtd_parser(&cmdline_parser);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) static void __exit cmdline_parser_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	deregister_mtd_parser(&cmdline_parser);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) module_init(cmdline_parser_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) module_exit(cmdline_parser_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) MODULE_PARM_DESC(mtdparts, "Partitioning specification");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) module_param(mtdparts, charp, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) MODULE_DESCRIPTION("Command line configuration of MTD partitions");