nand_spl: Support page-aligned read in nand_load, use chipselect

Supporting page-aligned reads doesn't incure any sinificant overhead, just
a small change in the algorithm. Also replace in_8 with readb, since there
is no in_8 on ARM.

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
Signed-off-by: Scott Wood <scottwood@freescale.com>

diff --git a/nand_spl/nand_boot.c b/nand_spl/nand_boot.c
index 81b4dfc5414e20abf64e6e1b7cdb4ad0c7d50b67..16d128fc836182b5b552ed28a119ac80b6c8b736 100644 (file)
--- a/nand_spl/nand_boot.c
+++ b/nand_spl/nand_boot.c
@@ -131,7 +131,7 @@ static int nand_is_bad_block(struct mtd_info *mtd, int block)
        /*
         * Read one byte
         */
-       if (in_8(this->IO_ADDR_R) != 0xff)
+       if (readb(this->IO_ADDR_R) != 0xff)
                return 1;
 
        return 0;
@@ -184,29 +184,33 @@ static int nand_read_page(struct mtd_info *mtd, int block, int page, uchar *dst)
        return 0;
 }
 
-static int nand_load(struct mtd_info *mtd, int offs, int uboot_size, uchar *dst)
+static int nand_load(struct mtd_info *mtd, unsigned int offs,
+                     unsigned int uboot_size, uchar *dst)
 {
-       int block;
-       int blockcopy_count;
-       int page;
+       unsigned int block, lastblock;
+       unsigned int page;
 
        /*
-        * offs has to be aligned to a block address!
+        * offs has to be aligned to a page address!
         */
        block = offs / CFG_NAND_BLOCK_SIZE;
-       blockcopy_count = 0;
+       lastblock = (offs + uboot_size - 1) / CFG_NAND_BLOCK_SIZE;
+       page = (offs % CFG_NAND_BLOCK_SIZE) / CFG_NAND_PAGE_SIZE;
 
-       while (blockcopy_count < (uboot_size / CFG_NAND_BLOCK_SIZE)) {
+       while (block <= lastblock) {
                if (!nand_is_bad_block(mtd, block)) {
                        /*
                         * Skip bad blocks
                         */
-                       for (page = 0; page < CFG_NAND_PAGE_COUNT; page++) {
+                       while (page < CFG_NAND_PAGE_COUNT) {
                                nand_read_page(mtd, block, page, dst);
                                dst += CFG_NAND_PAGE_SIZE;
+                               page++;
                        }
 
-                       blockcopy_count++;
+                       page = 0;
+               } else {
+                       lastblock++;
                }
 
                block++;
@@ -235,12 +239,18 @@ void nand_boot(void)
        nand_chip.dev_ready = NULL;     /* preset to NULL */
        board_nand_init(&nand_chip);
 
+       if (nand_chip.select_chip)
+               nand_chip.select_chip(&nand_info, 0);
+
        /*
         * Load U-Boot image from NAND into RAM
         */
        ret = nand_load(&nand_info, CFG_NAND_U_BOOT_OFFS, CFG_NAND_U_BOOT_SIZE,
                        (uchar *)CFG_NAND_U_BOOT_DST);
 
+       if (nand_chip.select_chip)
+               nand_chip.select_chip(&nand_info, -1);
+
        /*
         * Jump to U-Boot image
         */