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authorLadislav Michl <ladis@linux-mips.org>2016-07-12 20:28:11 +0200
committerTom Rini <trini@konsulko.com>2016-07-22 09:53:00 -0400
commit735717d18a012a6f34c74dd98cec8f46bac5c51c (patch)
tree7383563104570e92312cb0119e2d40fbf6d2f015 /drivers/mtd/onenand
parente1a89e9358b8cedd98ad346cccd08e1bca669072 (diff)
onenand_spl_simple: Add a simple OneNAND read function
Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Diffstat (limited to 'drivers/mtd/onenand')
-rw-r--r--drivers/mtd/onenand/onenand_spl.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/mtd/onenand/onenand_spl.c b/drivers/mtd/onenand/onenand_spl.c
index fe6b7d923c..1925f41d8a 100644
--- a/drivers/mtd/onenand/onenand_spl.c
+++ b/drivers/mtd/onenand/onenand_spl.c
@@ -93,6 +93,54 @@ static int onenand_spl_read_page(uint32_t block, uint32_t page, uint32_t *buf,
return 0;
}
+#ifdef CONFIG_SPL_UBI
+/* Temporary storage for non page aligned and non page sized reads. */
+static u8 scratch_buf[PAGE_4K];
+
+/**
+ * onenand_spl_read_block - Read data from physical eraseblock into a buffer
+ * @block: Number of the physical eraseblock
+ * @offset: Data offset from the start of @peb
+ * @len: Data size to read
+ * @dst: Address of the destination buffer
+ *
+ * Notes:
+ * @offset + @len are not allowed to be larger than a physical
+ * erase block. No sanity check done for simplicity reasons.
+ */
+int onenand_spl_read_block(int block, int offset, int len, void *dst)
+{
+ int page, read, psize;
+
+ psize = onenand_spl_get_geometry();
+ /* Calculate the page number */
+ page = offset / psize;
+ /* Offset to the start of a flash page */
+ offset = offset % psize;
+
+ while (len) {
+ /*
+ * Non page aligned reads go to the scratch buffer.
+ * Page aligned reads go directly to the destination.
+ */
+ if (offset || len < psize) {
+ onenand_spl_read_page(block, page,
+ (uint32_t *)scratch_buf, psize);
+ read = min(len, psize - offset);
+ memcpy(dst, scratch_buf + offset, read);
+ offset = 0;
+ } else {
+ onenand_spl_read_page(block, page, dst, psize);
+ read = psize;
+ }
+ page++;
+ len -= read;
+ dst += read;
+ }
+ return 0;
+}
+#endif
+
void onenand_spl_load_image(uint32_t offs, uint32_t size, void *dst)
{
uint32_t *addr = (uint32_t *)dst;