235 lines
7.1 KiB
C
235 lines
7.1 KiB
C
#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/bootmem.h>
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#include <linux/magic.h>
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#include <asm/mach-ar7/prom.h>
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#define IMAGE_A_SIZE 0X3c0000
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#define WRTP_PARTS 14
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#define NSP_IMG_MAGIC_NUMBER le32_to_cpu(0x4D544443)
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#define NSP_IMG_SECTION_TYPE_KERNEL (0x01)
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#define NSP_IMG_SECTION_TYPE_FILESYSTEM_ROOT (0x02)
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#define NSP_IMG_SECTION_TYPE_FILESYSTEM (0x03)
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#define MAX_NUM_PARTITIONS 14
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static int part_count=0;
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static struct mtd_partition titan_parts[WRTP_PARTS];
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struct nsp_img_hdr_head
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{
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unsigned int magic; /* Magic number to identify this image header */
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unsigned int boot_offset; /* Offset from start of header to kernel code. */
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unsigned int flags; /* Image flags. */
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unsigned int hdr_version; /* Version of this header. */
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unsigned int hdr_size; /* The complete size of all portions of the header */
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unsigned int prod_id; /* This product id */
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unsigned int rel_id; /* Which release this is */
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unsigned int version; /* name-MMM.nnn.ooo-rxx => 0xMMnnooxx. See comment
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below */
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unsigned int image_size; /* Image size (including header) */
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unsigned int info_offset; /* Offset from start of header to info block */
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unsigned int sect_info_offset; /* Offset from start of header to section desc */
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unsigned int chksum_offset; /* Offset from start of header to chksum block */
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unsigned int pad1;
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};
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struct nsp_img_hdr_section_info
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{
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unsigned int num_sects; /* Number of section (and section desc blocks) in this image */
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unsigned int sect_size; /* Size of a SINGLE section_desc block */
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unsigned int sections_offset; /* Offset to from start of header to the start of the section blocks */
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};
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/* There will be one of more of the following stuctures in the image header. Each
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section will have one of these blocks. */
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struct nsp_img_hdr_sections
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{
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unsigned int offset; /* Offset of section from start of NSP_IMG_HDR_HEAD */
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unsigned int total_size; /* Size of section (including pad size.) */
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unsigned int raw_size; /* Size of section only */
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unsigned int flags; /* Section flags */
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unsigned int chksum; /* Section checksum */
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unsigned int type; /* Section type. What kind of info does this section describe */
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char name[16]; /* Reference name for this section. */
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};
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static int titan_parse_env_address(char *env_name, unsigned int *flash_base,
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unsigned int *flash_end)
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{
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char image_name[30];
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char *env_ptr;
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char *base_ptr;
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char *end_ptr;
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char * string_ptr;
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/* Get the image variable */
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env_ptr = prom_getenv(env_name);
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if(!env_ptr){
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printk("titan: invalid env name, %s.\n", env_name);
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return -1; /* Error, no image variable */
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}
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strncpy(image_name, env_ptr, 30);
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image_name[29]=0;
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string_ptr = image_name;
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/* Extract the start and stop addresses of the partition */
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base_ptr = strsep(&string_ptr, ",");
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end_ptr = strsep(&string_ptr, ",");
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if ((base_ptr == NULL) || (end_ptr == NULL)) {
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printk("titan: Couldn't tokenize %s start,end.\n", image_name);
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return -1;
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}
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*flash_base = (unsigned int) simple_strtol(base_ptr, NULL, 0);
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*flash_end = (unsigned int) simple_strtol(end_ptr, NULL, 0);
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if((!*flash_base) || (!*flash_end)) {
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printk("titan: Unable to convert :%s: :%s: into start,end values.\n",
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env_name, image_name);
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return -1;
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}
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*flash_base &= 0x0fffffff;
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*flash_end &= 0x0fffffff;
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return 0;
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}
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static int titan_get_single_image(char *bootcfg_name, unsigned int *flash_base,
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unsigned int *flash_end)
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{
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char *env_ptr;
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char *base_ptr;
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char *end_ptr;
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char image_name[30];
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char * string_ptr;
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if(!bootcfg_name || !flash_base || !flash_end)
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return -1;
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env_ptr = prom_getenv(bootcfg_name);
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if(!env_ptr){
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printk("titan: %s variable not found.\n", bootcfg_name);
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return -1; /* Error, no bootcfg variable */
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}
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string_ptr = image_name;
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/* Save off the image name */
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strncpy(image_name, env_ptr, 30);
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image_name[29]=0;
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end_ptr=strsep(&string_ptr, "\"");
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base_ptr=strsep(&string_ptr, "\""); /* Loose the last " */
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if(!end_ptr || !base_ptr){
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printk("titan: invalid bootcfg format, %s.\n", image_name);
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return -1; /* Error, invalid bootcfg variable */
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}
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/* Now, parse the addresses */
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return titan_parse_env_address(base_ptr, flash_base, flash_end);
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}
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static void titan_add_partition(char * env_name, unsigned int flash_base, unsigned int flash_end)
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{
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titan_parts[part_count].name = env_name;
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titan_parts[part_count].offset = flash_base;
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titan_parts[part_count].size = flash_end-flash_base;
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titan_parts[part_count].mask_flags = (strcmp(env_name, "bootloader")==0||
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strcmp(env_name, "boot_env")==0 ||
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strcmp(env_name, "full_image")==0 )?MTD_WRITEABLE:0;
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part_count++;
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}
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int create_titan_partitions(struct mtd_info *master,
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struct mtd_partition **pparts,
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unsigned long origin)
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{
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struct nsp_img_hdr_head hdr;
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struct nsp_img_hdr_section_info sect_info;
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struct nsp_img_hdr_sections section;
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unsigned int flash_base, flash_end;
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unsigned int start, end;
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char *name;
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int i;
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int total_sects=0;
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size_t len;
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/* Get the bootcfg env variable first */
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if(titan_get_single_image("BOOTCFG", &flash_base, &flash_end)) {
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/* Error, fallback */
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return -1;
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}
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/* Get access to the header, and do some validation checks */
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//hdr=(struct nsp_img_hdr_head*)flash_base;
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mtd_read(master, flash_base, sizeof(struct nsp_img_hdr_head), &len, (uint8_t *)&hdr);
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if(hdr.magic != NSP_IMG_MAGIC_NUMBER)
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return -1; /* Not a single image */
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mtd_read(master, flash_base + hdr.sect_info_offset, sizeof(struct nsp_img_hdr_section_info), &len, (uint8_t *)§_info);
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/* Look for the root fs, and add it first. This way we KNOW where the rootfs is */
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for(i=0; i< sect_info.num_sects && i<MAX_NUM_PARTITIONS; i++){
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mtd_read(master, flash_base + sect_info.sections_offset + (i * sect_info.sect_size) , sizeof(struct nsp_img_hdr_sections), &len, (uint8_t *)§ion);
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/* Add only the root partition */
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if(section.type != NSP_IMG_SECTION_TYPE_FILESYSTEM_ROOT){
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continue;
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}
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start=flash_base + section.offset;
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end=start + section.total_size;
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titan_add_partition("root", start, end);
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total_sects++;
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}
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for(i=0; i< sect_info.num_sects && i<MAX_NUM_PARTITIONS; i++){
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mtd_read(master, flash_base + sect_info.sections_offset + (i * sect_info.sect_size) , sizeof(struct nsp_img_hdr_sections), &len, (uint8_t *)§ion);
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name=section.name;
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if(section.type == NSP_IMG_SECTION_TYPE_FILESYSTEM_ROOT)
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{
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name = "rootfs";
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start=flash_base + section.offset;
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end=flash_end;
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titan_add_partition(name, start, end);
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total_sects++;
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}
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else if(section.type == NSP_IMG_SECTION_TYPE_KERNEL)
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{
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name = "kernel";
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start=flash_base + section.offset;
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end=start + section.total_size;
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titan_add_partition(name, start, end);
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total_sects++;
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}
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}
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/* Next, lets add the single image */
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titan_add_partition("primary_image", flash_base, flash_end);
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total_sects++;
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titan_add_partition("full_image", 0, master->size);
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total_sects++;
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if (!titan_parse_env_address("BOOTLOADER", &start, &end)){
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titan_add_partition("bootloader", start, end);
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total_sects++;
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}
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if (!titan_parse_env_address("boot_env", &start, &end)){
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titan_add_partition("boot_env", start, end);
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total_sects++;
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}
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*pparts = titan_parts;
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return total_sects;
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}
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