[U-Boot] [v2 PATCH 08/12] spl, nand, atmel_nand: add erase one block function

[Heiko Schocher <hs@denx.de>]

erase one nand block in spl code. keep it simple, as size matters
This is used on the upcoming taurus spl support.

Signed-off-by: Heiko Schocher <hs@denx.de>

---

Changes in v2:
add comment from scott wood:
- move nand_erase_one into "include/nand.h" and rename it
  to spl_nand_erase_one

 drivers/mtd/nand/atmel_nand.c | 33 +++++++++++++++++++++++++++++++++
 include/nand.h                |  1 +
 2 files changed, 34 insertions(+)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index d506e42..d6d6f85 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -1274,6 +1274,39 @@ static int nand_read_page(int block, int page, void *dst)
 
 	return 0;
 }
+
+int spl_nand_erase_one(int block, int page)
+{
+	struct nand_chip *this = mtd.priv;
+	void (*hwctrl)(struct mtd_info *mtd, int cmd,
+			unsigned int ctrl) = this->cmd_ctrl;
+	int page_addr;
+
+	if (nand_chip.select_chip)
+		nand_chip.select_chip(&mtd, 0);
+
+	page_addr = page + block * CONFIG_SYS_NAND_PAGE_COUNT;
+	hwctrl(&mtd, NAND_CMD_ERASE1, NAND_CTRL_CLE | NAND_CTRL_CHANGE);
+	/* Row address */
+	hwctrl(&mtd, (page_addr & 0xff), NAND_CTRL_ALE | NAND_CTRL_CHANGE);
+	hwctrl(&mtd, ((page_addr >> 8) & 0xff),
+	       NAND_CTRL_ALE | NAND_CTRL_CHANGE);
+#ifdef CONFIG_SYS_NAND_5_ADDR_CYCLE
+	/* One more address cycle for devices > 128MiB */
+	hwctrl(&mtd, (page_addr >> 16) & 0x0f,
+	       NAND_CTRL_ALE | NAND_CTRL_CHANGE);
+#endif
+
+	hwctrl(&mtd, NAND_CMD_ERASE2, NAND_CTRL_CLE | NAND_CTRL_CHANGE);
+	udelay(2000);
+
+	while (!this->dev_ready(&mtd))
+		;
+
+	nand_deselect();
+
+	return 0;
+}
 #else
 static int nand_read_page(int block, int page, void *dst)
 {
diff --git a/include/nand.h b/include/nand.h
index fc735d1..15e31ab 100644
--- a/include/nand.h
+++ b/include/nand.h
@@ -167,3 +167,4 @@ __attribute__((noreturn)) void nand_boot(void);
 #define ENV_OFFSET_SIZE 8
 int get_nand_env_oob(nand_info_t *nand, unsigned long *result);
 #endif
+int spl_nand_erase_one(int block, int page);
-- 
1.8.3.1