LXR uboot/drivers/mtd/nand/raw/nand_spl

   1int nand_spl_load_image(uint32_t offs, unsigned int size, void *dst)
   2{
   3        unsigned int block, lastblock;
   4        unsigned int page, page_offset;
   5
   6        /* offs has to be aligned to a page address! */
   7        block = offs / CONFIG_SYS_NAND_BLOCK_SIZE;
   8        lastblock = (offs + size - 1) / CONFIG_SYS_NAND_BLOCK_SIZE;
   9        page = (offs % CONFIG_SYS_NAND_BLOCK_SIZE) / CONFIG_SYS_NAND_PAGE_SIZE;
  10        page_offset = offs % CONFIG_SYS_NAND_PAGE_SIZE;
  11
  12        while (block <= lastblock) {
  13                if (!nand_is_bad_block(block)) {
  14                        /* Skip bad blocks */
  15                        while (page < CONFIG_SYS_NAND_PAGE_COUNT) {
  16                                nand_read_page(block, page, dst);
  17                                /*
  18                                 * When offs is not aligned to page address the
  19                                 * extra offset is copied to dst as well. Copy
  20                                 * the image such that its first byte will be
  21                                 * at the dst.
  22                                 */
  23                                if (unlikely(page_offset)) {
  24                                        memmove(dst, dst + page_offset,
  25                                                CONFIG_SYS_NAND_PAGE_SIZE);
  26                                        dst = (void *)(dst - page_offset);
  27                                        page_offset = 0;
  28                                }
  29                                dst += CONFIG_SYS_NAND_PAGE_SIZE;
  30                                page++;
  31                        }
  32
  33                        page = 0;
  34                } else {
  35                        lastblock++;
  36                }
  37
  38                block++;
  39        }
  40
  41        return 0;
  42}
  43
  44/**
  45 * nand_spl_adjust_offset - Adjust offset from a starting sector
  46 * @sector:     Address of the sector
  47 * @offs:       Offset starting from @sector
  48 *
  49 * If one or more bad blocks are in the address space between @sector
  50 * and @sector + @offs, @offs is increased by the NAND block size for
  51 * each bad block found.
  52 */
  53u32 nand_spl_adjust_offset(u32 sector, u32 offs)
  54{
  55        unsigned int block, lastblock;
  56
  57        block = sector / CONFIG_SYS_NAND_BLOCK_SIZE;
  58        lastblock = (sector + offs) / CONFIG_SYS_NAND_BLOCK_SIZE;
  59
  60        while (block <= lastblock) {
  61                if (nand_is_bad_block(block)) {
  62                        offs += CONFIG_SYS_NAND_BLOCK_SIZE;
  63                        lastblock++;
  64                }
  65
  66                block++;
  67        }
  68
  69        return offs;
  70}
  71
  72#ifdef CONFIG_SPL_UBI
  73/*
  74 * Temporary storage for non NAND page aligned and non NAND page sized
  75 * reads. Note: This does not support runtime detected FLASH yet, but
  76 * that should be reasonably easy to fix by making the buffer large
  77 * enough :)
  78 */
  79static u8 scratch_buf[CONFIG_SYS_NAND_PAGE_SIZE];
  80
  81/**
  82 * nand_spl_read_block - Read data from physical eraseblock into a buffer
  83 * @block:      Number of the physical eraseblock
  84 * @offset:     Data offset from the start of @peb
  85 * @len:        Data size to read
  86 * @dst:        Address of the destination buffer
  87 *
  88 * This could be further optimized if we'd have a subpage read
  89 * function in the simple code. On NAND which allows subpage reads
  90 * this would spare quite some time to readout e.g. the VID header of
  91 * UBI.
  92 *
  93 * Notes:
  94 *      @offset + @len are not allowed to be larger than a physical
  95 *      erase block. No sanity check done for simplicity reasons.
  96 *
  97 * To support runtime detected flash this needs to be extended by
  98 * information about the actual flash geometry, but thats beyond the
  99 * scope of this effort and for most applications where fast boot is
 100 * required it is not an issue anyway.
 101 */
 102int nand_spl_read_block(int block, int offset, int len, void *dst)
 103{
 104        int page, read;
 105
 106        /* Calculate the page number */
 107        page = offset / CONFIG_SYS_NAND_PAGE_SIZE;
 108
 109        /* Offset to the start of a flash page */
 110        offset = offset % CONFIG_SYS_NAND_PAGE_SIZE;
 111
 112        while (len) {
 113                /*
 114                 * Non page aligned reads go to the scratch buffer.
 115                 * Page aligned reads go directly to the destination.
 116                 */
 117                if (offset || len < CONFIG_SYS_NAND_PAGE_SIZE) {
 118                        nand_read_page(block, page, scratch_buf);
 119                        read = min(len, CONFIG_SYS_NAND_PAGE_SIZE - offset);
 120                        memcpy(dst, scratch_buf + offset, read);
 121                        offset = 0;
 122                } else {
 123                        nand_read_page(block, page, dst);
 124                        read = CONFIG_SYS_NAND_PAGE_SIZE;
 125                }
 126                page++;
 127                len -= read;
 128                dst += read;
 129        }
 130        return 0;
 131}
 132#endif
 133