From: San Mehat <san@google.com>
Date: Thu, 20 Aug 2009 17:50:45 +0000 (-0700)
Subject: mtd: nand: Add naieve panic_write support for generic nand devices.
X-Git-Tag: firefly_0821_release~9833^2~5^2~256
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4d2a623834a5769e36f708b879cf87cf4cd34cae;p=firefly-linux-kernel-4.4.55.git

mtd: nand: Add naieve panic_write support for generic nand devices.

Signed-off-by: San Mehat <san@google.com>

mtd: nand_base: fix nand_panic_wait

fix the problem of nand_panic_wait

Signed-off-by: Tom Zhu <a2289c@android-hal-04.(none)>
Signed-off-by: San Mehat <san@google.com>
---

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index d551ddd9537a..c18d3b8f5162 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -3056,6 +3056,44 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips,
 	return 0;
 }
 
+static void nand_panic_wait(struct mtd_info *mtd)
+{
+	struct nand_chip *chip = mtd->priv;
+	int i;
+
+	if (chip->state != FL_READY)
+		for (i = 0; i < 40; i++) {
+			if (chip->dev_ready(mtd))
+				break;
+			mdelay(10);
+		}
+	chip->state = FL_READY;
+}
+
+static int nand_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
+			    size_t *retlen, const u_char *buf)
+{
+	struct nand_chip *chip = mtd->priv;
+	int ret;
+
+	/* Do not allow reads past end of device */
+	if ((to + len) > mtd->size)
+		return -EINVAL;
+	if (!len)
+		return 0;
+
+	nand_panic_wait(mtd);
+
+	chip->ops.len = len;
+	chip->ops.datbuf = (uint8_t *)buf;
+	chip->ops.oobbuf = NULL;
+
+	ret = nand_do_write_ops(mtd, to, &chip->ops);
+
+	*retlen = chip->ops.retlen;
+	return ret;
+}
+
 
 /**
  * nand_scan_tail - [NAND Interface] Scan for the NAND device
@@ -3265,6 +3303,7 @@ int nand_scan_tail(struct mtd_info *mtd)
 	mtd->panic_write = panic_nand_write;
 	mtd->read_oob = nand_read_oob;
 	mtd->write_oob = nand_write_oob;
+	mtd->panic_write = nand_panic_write;
 	mtd->sync = nand_sync;
 	mtd->lock = NULL;
 	mtd->unlock = NULL;