target/linux/ar7/files/drivers/mtd/titanpart.c

   1 #include <linux/kernel.h>
   2 #include <linux/slab.h>
   3
   4 #include <linux/mtd/mtd.h>
   5 #include <linux/mtd/partitions.h>
   6 #include <linux/bootmem.h>
   7 #include <linux/magic.h>
   8 #include <asm/mach-ar7/prom.h>
   9
  10 #define IMAGE_A_SIZE 0X3c0000
  11 #define WRTP_PARTS      14
  12 #define NSP_IMG_MAGIC_NUMBER            le32_to_cpu(0x4D544443)
  13 #define NSP_IMG_SECTION_TYPE_KERNEL             (0x01)
  14 #define NSP_IMG_SECTION_TYPE_FILESYSTEM_ROOT    (0x02)
  15 #define NSP_IMG_SECTION_TYPE_FILESYSTEM         (0x03)
  16 #define MAX_NUM_PARTITIONS 14
  17
  18 static int part_count=0;
  19 static struct mtd_partition titan_parts[WRTP_PARTS];
  20
  21
  22 struct nsp_img_hdr_head
  23 {
  24         unsigned int    magic;          /* Magic number to identify this image header */
  25         unsigned int    boot_offset;    /* Offset from start of header to kernel code. */
  26         unsigned int    flags;          /* Image flags. */
  27         unsigned int    hdr_version;    /* Version of this header. */
  28         unsigned int    hdr_size;       /* The complete size of all portions of the header */
  29         unsigned int    prod_id;        /* This product id */
  30         unsigned int    rel_id;         /* Which release this is */
  31         unsigned int    version;        /* name-MMM.nnn.ooo-rxx => 0xMMnnooxx. See comment
  32                                            below */
  33         unsigned int    image_size;     /* Image size (including header) */
  34         unsigned int    info_offset;    /* Offset from start of header to info block */
  35         unsigned int    sect_info_offset;       /* Offset from start of header to section desc */
  36         unsigned int    chksum_offset;  /* Offset from start of header to chksum block */
  37         unsigned int    pad1;
  38 };
  39
  40 struct nsp_img_hdr_section_info
  41 {
  42         unsigned int    num_sects;      /* Number of section (and section desc blocks) in this image */
  43         unsigned int    sect_size;      /* Size of a SINGLE section_desc block */
  44         unsigned int    sections_offset;        /* Offset to from start of header to the start of the section blocks */
  45 };
  46
  47 /* There will be one of more of the following stuctures in the image header. Each
  48    section will have one of these blocks. */
  49 struct nsp_img_hdr_sections
  50 {
  51         unsigned int    offset;         /* Offset of section from start of NSP_IMG_HDR_HEAD */
  52         unsigned int    total_size;     /* Size of section (including pad size.) */
  53         unsigned int    raw_size;       /* Size of section only */
  54         unsigned int    flags;          /* Section flags */
  55         unsigned int    chksum;         /* Section checksum */
  56         unsigned int    type;           /* Section type. What kind of info does this section describe */
  57         char            name[16];       /* Reference name for this section. */
  58 };
  59
  60
  61
  62
  63
  64 static int      titan_parse_env_address(char *env_name, unsigned int *flash_base,
  65                                 unsigned int *flash_end)
  66 {
  67         char    image_name[30];
  68         char    *env_ptr;
  69         char    *base_ptr;
  70         char    *end_ptr;
  71         char * string_ptr;
  72         /* Get the image variable */
  73         env_ptr = prom_getenv(env_name);
  74         if(!env_ptr){
  75                 printk("titan: invalid env name, %s.\n", env_name);
  76                 return -1;      /* Error, no image variable */
  77         }
  78         strncpy(image_name, env_ptr, 30);
  79         image_name[29]=0;
  80         string_ptr = image_name;
  81         /* Extract the start and stop addresses of the partition */
  82         base_ptr = strsep(&string_ptr, ",");
  83         end_ptr = strsep(&string_ptr, ",");
  84         if ((base_ptr == NULL) || (end_ptr == NULL)) {
  85                 printk("titan: Couldn't tokenize %s start,end.\n", image_name);
  86                 return -1;
  87         }
  88
  89         *flash_base = (unsigned int) simple_strtol(base_ptr, NULL, 0);
  90         *flash_end = (unsigned int) simple_strtol(end_ptr, NULL, 0);
  91         if((!*flash_base) || (!*flash_end)) {
  92                 printk("titan: Unable to convert :%s: :%s: into start,end values.\n",
  93                                 env_name, image_name);
  94                 return -1;
  95         }
  96         *flash_base &= 0x0fffffff;
  97         *flash_end &= 0x0fffffff;
  98         return 0;
  99 }
 100
 101
 102
 103 static int      titan_get_single_image(char *bootcfg_name, unsigned int *flash_base,
 104                                 unsigned int *flash_end)
 105 {
 106         char    *env_ptr;
 107         char    *base_ptr;
 108         char    *end_ptr;
 109         char    image_name[30];
 110         char * string_ptr;
 111
 112         if(!bootcfg_name || !flash_base || !flash_end)
 113                 return -1;
 114
 115         env_ptr = prom_getenv(bootcfg_name);
 116         if(!env_ptr){
 117                 printk("titan: %s variable not found.\n", bootcfg_name);
 118                 return -1;      /* Error, no bootcfg variable */
 119         }
 120
 121         string_ptr = image_name;
 122         /* Save off the image name */
 123         strncpy(image_name, env_ptr, 30);
 124         image_name[29]=0;
 125
 126         end_ptr=strsep(&string_ptr, "\"");
 127         base_ptr=strsep(&string_ptr, "\"");             /* Loose the last " */
 128         if(!end_ptr || !base_ptr){
 129                 printk("titan: invalid bootcfg format, %s.\n", image_name);
 130                 return -1;      /* Error, invalid bootcfg variable */
 131         }
 132
 133         /* Now, parse the addresses */
 134         return titan_parse_env_address(base_ptr, flash_base, flash_end);
 135 }
 136
 137
 138
 139 static void titan_add_partition(char * env_name, unsigned int flash_base, unsigned int flash_end)
 140 {
 141                 titan_parts[part_count].name = env_name;
 142                 titan_parts[part_count].offset = flash_base;
 143                 titan_parts[part_count].size = flash_end-flash_base;
 144                 titan_parts[part_count].mask_flags = (strcmp(env_name, "bootloader")==0||
 145                         strcmp(env_name, "boot_env")==0 ||
 146                         strcmp(env_name, "full_image")==0 )?MTD_WRITEABLE:0;
 147                 part_count++;
 148
 149 }
 150 int create_titan_partitions(struct mtd_info *master,
 151         struct mtd_partition **pparts,
 152         unsigned long origin)
 153 {
 154         struct nsp_img_hdr_head         hdr;
 155         struct nsp_img_hdr_section_info sect_info;
 156         struct nsp_img_hdr_sections     section;
 157         unsigned int                    flash_base, flash_end;
 158         unsigned int                    start, end;
 159         char                            *name;
 160         int     i;
 161         int     total_sects=0;
 162         size_t len;
 163
 164         /* Get the bootcfg env variable first */
 165         if(titan_get_single_image("BOOTCFG", &flash_base, &flash_end)) {
 166                 /* Error, fallback */
 167                 return -1;
 168         }
 169
 170         /* Get access to the header, and do some validation checks */
 171         //hdr=(struct nsp_img_hdr_head*)flash_base;
 172         master->read(master, flash_base, sizeof(struct nsp_img_hdr_head), &len, (uint8_t *)&hdr);
 173         if(hdr.magic != NSP_IMG_MAGIC_NUMBER)
 174                 return -1;      /* Not a single image */
 175
 176         master->read(master, flash_base + hdr.sect_info_offset, sizeof(struct nsp_img_hdr_section_info), &len, (uint8_t *)&sect_info);
 177
 178         /* Look for the root fs, and add it first. This way we KNOW where the rootfs is */
 179         for(i=0; i< sect_info.num_sects && i<MAX_NUM_PARTITIONS; i++){
 180                 master->read(master, flash_base + sect_info.sections_offset + (i * sect_info.sect_size) , sizeof(struct nsp_img_hdr_sections), &len, (uint8_t *)&section);
 181                 /* Add only the root partition */
 182                 if(section.type != NSP_IMG_SECTION_TYPE_FILESYSTEM_ROOT){
 183                         continue;
 184                 }
 185                 start=flash_base + section.offset;
 186                 end=start + section.total_size;
 187                 titan_add_partition("root", start, end);
 188                 total_sects++;
 189
 190         }
 191
 192         for(i=0; i< sect_info.num_sects && i<MAX_NUM_PARTITIONS; i++){
 193
 194                 master->read(master, flash_base + sect_info.sections_offset + (i * sect_info.sect_size) , sizeof(struct nsp_img_hdr_sections), &len, (uint8_t *)&section);
 195
 196                 name=section.name;
 197                 if(section.type == NSP_IMG_SECTION_TYPE_FILESYSTEM_ROOT)
 198                 {
 199                         name = "rootfs";
 200                         start=flash_base + section.offset;
 201                         end=flash_end;
 202                         titan_add_partition(name, start, end);
 203                         total_sects++;
 204                 }
 205                 else if(section.type == NSP_IMG_SECTION_TYPE_KERNEL)
 206                 {
 207                         name = "kernel";
 208                         start=flash_base + section.offset;
 209                         end=start + section.total_size;
 210                         titan_add_partition(name, start, end);
 211                         total_sects++;
 212                 }
 213
 214         }
 215
 216         /* Next, lets add the single image */
 217         titan_add_partition("primary_image", flash_base, flash_end);
 218         total_sects++;
 219
 220
 221         titan_add_partition("full_image", 0,  master->size);
 222         total_sects++;
 223
 224         if (!titan_parse_env_address("BOOTLOADER", &start, &end)){
 225                 titan_add_partition("bootloader", start, end);
 226                 total_sects++;
 227         }
 228         if (!titan_parse_env_address("boot_env", &start, &end)){
 229                 titan_add_partition("boot_env", start, end);
 230                 total_sects++;
 231         }
 232         *pparts = titan_parts;
 233         return total_sects;
 234 }