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onenand_spl_simple: Add a simple OneNAND read function
Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
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@ -93,6 +93,54 @@ static int onenand_spl_read_page(uint32_t block, uint32_t page, uint32_t *buf,
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return 0;
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}
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#ifdef CONFIG_SPL_UBI
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/* Temporary storage for non page aligned and non page sized reads. */
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static u8 scratch_buf[PAGE_4K];
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/**
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* onenand_spl_read_block - Read data from physical eraseblock into a buffer
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* @block: Number of the physical eraseblock
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* @offset: Data offset from the start of @peb
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* @len: Data size to read
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* @dst: Address of the destination buffer
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*
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* Notes:
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* @offset + @len are not allowed to be larger than a physical
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* erase block. No sanity check done for simplicity reasons.
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*/
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int onenand_spl_read_block(int block, int offset, int len, void *dst)
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{
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int page, read, psize;
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psize = onenand_spl_get_geometry();
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/* Calculate the page number */
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page = offset / psize;
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/* Offset to the start of a flash page */
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offset = offset % psize;
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while (len) {
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/*
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* Non page aligned reads go to the scratch buffer.
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* Page aligned reads go directly to the destination.
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*/
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if (offset || len < psize) {
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onenand_spl_read_page(block, page,
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(uint32_t *)scratch_buf, psize);
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read = min(len, psize - offset);
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memcpy(dst, scratch_buf + offset, read);
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offset = 0;
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} else {
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onenand_spl_read_page(block, page, dst, psize);
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read = psize;
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}
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page++;
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len -= read;
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dst += read;
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}
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return 0;
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}
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#endif
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void onenand_spl_load_image(uint32_t offs, uint32_t size, void *dst)
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{
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uint32_t *addr = (uint32_t *)dst;
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@ -49,6 +49,7 @@ extern int flexonenand_set_boundary(struct mtd_info *mtd, int die,
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int boundary, int lock);
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/* SPL */
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int onenand_spl_read_block(int block, int offset, int len, void *dst);
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void onenand_spl_load_image(uint32_t offs, uint32_t size, void *dst);
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#endif /* __UBOOT_ONENAND_H */
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