flash_mtdparts.c revision 1.1.2.2
1 /* $NetBSD: flash_mtdparts.c,v 1.1.2.2 2017/12/03 11:37:01 jdolecek Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 Jared McNeill <jmcneill (at) invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: flash_mtdparts.c,v 1.1.2.2 2017/12/03 11:37:01 jdolecek Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/device.h> 35 #include <sys/systm.h> 36 #include <sys/kmem.h> 37 38 #include <dev/flash/flash.h> 39 40 extern int flash_print(void *, const char *); 41 42 static void 43 flash_attach_partition(struct flash_interface *flash_if, device_t parent, 44 struct flash_partition *part) 45 { 46 struct flash_attach_args faa; 47 48 faa.flash_if = flash_if; 49 faa.partinfo = *part; 50 51 config_found_ia(parent, "flashbus", &faa, flash_print); 52 } 53 54 static flash_size_t 55 flash_parse_size(char *partdef, char **ep) 56 { 57 flash_size_t size; 58 59 /* Parse the size parameter */ 60 size = strtoul(partdef, ep, 10); 61 if (partdef == *ep) 62 return 0; 63 64 switch (**ep) { 65 case 'G': 66 case 'g': 67 size <<= 10; 68 /* FALLTHROUGH */ 69 case 'M': 70 case 'm': 71 size <<= 10; 72 /* FALLTHROUGH */ 73 case 'K': 74 case 'k': 75 size <<= 10; 76 (*ep)++; 77 break; 78 } 79 80 return size; 81 } 82 83 static int 84 flash_parse_partdef(flash_size_t flash_size, char *partdef, flash_off_t *offset, 85 struct flash_partition *ppart) 86 { 87 struct flash_partition part; 88 89 /* Get the partition size */ 90 if (*partdef == '-') { 91 /* Use the remaining space */ 92 part.part_size = 0; 93 partdef++; 94 } else { 95 part.part_size = flash_parse_size(partdef, &partdef); 96 if (part.part_size == 0) 97 return EINVAL; 98 } 99 100 if (*partdef == '@') { 101 /* Explicit offset */ 102 partdef++; 103 part.part_offset = flash_parse_size(partdef, &partdef); 104 } else { 105 /* Offset is the end of the previous partition */ 106 part.part_offset = *offset; 107 } 108 109 /* Calculate partition size for "all remaining space" parts */ 110 if (part.part_size == 0) 111 part.part_size = flash_size - part.part_offset; 112 113 if (*partdef == '(') { 114 /* Partition name */ 115 partdef++; 116 part.part_name = partdef; 117 partdef = strchr(partdef, ')'); 118 if (partdef == NULL) 119 return EINVAL; 120 *partdef = '\0'; 121 partdef++; 122 } 123 124 part.part_flags = 0; 125 if (strncmp(partdef, "ro", 2) == 0) { 126 part.part_flags |= FLASH_PART_READONLY; 127 partdef += 2; 128 } 129 130 *ppart = part; 131 132 *offset = part.part_offset + part.part_size; 133 134 return 0; 135 } 136 137 static void 138 flash_parse_mtddef(struct flash_interface *flash_if, device_t parent, 139 flash_size_t flash_size, char *mtddef) 140 { 141 struct flash_partition part; 142 char *partdef = mtddef, *nextdef; 143 flash_off_t offset = 0; 144 int error; 145 146 while (partdef && offset < flash_size) { 147 /* Find the end */ 148 nextdef = strchr(partdef, ','); 149 if (nextdef == NULL) 150 nextdef = strchr(partdef, ' '); 151 if (nextdef) 152 *nextdef++ = '\0'; 153 154 error = flash_parse_partdef(flash_size, partdef, &offset, 155 &part); 156 if (error) { 157 aprint_error_dev(parent, "bad partition def '%s'\n", 158 partdef); 159 return; 160 } 161 162 flash_attach_partition(flash_if, parent, &part); 163 164 partdef = nextdef; 165 } 166 } 167 168 /* 169 * Attach partitions to a given parent device node that match the supplied 170 * device id. The cmdline follows the following format: 171 * 172 * mtdparts=<mtddef>[;<mtddef] 173 * <mtddef> := <mtd-id>:<partdef>[,<partdef>] 174 * <partdef> := <size>[@offset][<name>][ro] 175 * <mtd-id> := unique id used in mapping driver/device (number of flash bank) 176 * <size> := memsize OR "-" to denote all remaining space 177 * <name> := '(' NAME ')' 178 */ 179 void 180 flash_attach_mtdparts(struct flash_interface *flash_if, device_t parent, 181 flash_size_t flash_size, const char *mtd_id, const char *cmdline) 182 { 183 char *mtddef; 184 size_t mtddeflen; 185 186 /* Find the definition for our mtd id */ 187 const char *s = strstr(cmdline, mtd_id); 188 if (s == NULL || s[strlen(mtd_id)] != ':') 189 return; 190 191 mtddef = kmem_strdupsize(s + strlen(mtd_id) + 1, &mtddeflen, KM_SLEEP); 192 193 flash_parse_mtddef(flash_if, parent, flash_size, mtddef); 194 195 kmem_free(mtddef, mtddeflen); 196 } 197
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