mtd: nand: refactor erase_cmd() to return chip status

The nand_chip::erase_cmd callback previously served a dual purpose; for
one, it allowed a per-flash-chip override, so that AG-AND devices could
use a different erase command than other NAND. These AND devices were
dropped in commit 14c6578683367b1e7af0c3c09e872b45a45183a7 (mtd: nand:
remove AG-AND support). On the other hand, some drivers (denali and
doc-g4) need to use this sort of callback to implement
controller-specific erase operations.

To make the latter operation easier for some drivers (e.g., ST's new BCH
NAND driver), it helps if the command dispatch and wait functions can be
lumped together, rather than called separately.

This patch does two things:
 1. Pull the call to chip->waitfunc() into chip->erase_cmd(), and return
    the status from this callback
 2. Rename erase_cmd() to just erase(), since this callback does a
    little more than just send a command

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Tested-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 14 insertions, 13 deletions

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index c07cd573ad3..9f2012a3e76 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -1233,7 +1233,7 @@ static int denali_waitfunc(struct mtd_info *mtd, struct nand_chip *chip)
 	return status;
 }
 
-static void denali_erase(struct mtd_info *mtd, int page)
+static int denali_erase(struct mtd_info *mtd, int page)
 {
 	struct denali_nand_info *denali = mtd_to_denali(mtd);
 
@@ -1250,8 +1250,7 @@ static void denali_erase(struct mtd_info *mtd, int page)
 	irq_status = wait_for_irq(denali, INTR_STATUS__ERASE_COMP |
 					INTR_STATUS__ERASE_FAIL);
 
-	denali->status = (irq_status & INTR_STATUS__ERASE_FAIL) ?
-						NAND_STATUS_FAIL : PASS;
+	return (irq_status & INTR_STATUS__ERASE_FAIL) ? NAND_STATUS_FAIL : PASS;
 }
 
 static void denali_cmdfunc(struct mtd_info *mtd, unsigned int cmd, int col,
@@ -1584,7 +1583,7 @@ int denali_init(struct denali_nand_info *denali)
 	denali->nand.ecc.write_page_raw = denali_write_page_raw;
 	denali->nand.ecc.read_oob = denali_read_oob;
 	denali->nand.ecc.write_oob = denali_write_oob;
-	denali->nand.erase_cmd = denali_erase;
+	denali->nand.erase = denali_erase;
 
 	if (nand_scan_tail(&denali->mtd)) {
 		ret = -ENXIO;
diff --git a/drivers/mtd/nand/docg4.c b/drivers/mtd/nand/docg4.c
index 1b0265e85a0..ce24637e14f 100644
--- a/drivers/mtd/nand/docg4.c
+++ b/drivers/mtd/nand/docg4.c
@@ -872,7 +872,7 @@ static int docg4_read_oob(struct mtd_info *mtd, struct nand_chip *nand,
 	return 0;
 }
 
-static void docg4_erase_block(struct mtd_info *mtd, int page)
+static int docg4_erase_block(struct mtd_info *mtd, int page)
 {
 	struct nand_chip *nand = mtd->priv;
 	struct docg4_priv *doc = nand->priv;
@@ -916,6 +916,8 @@ static void docg4_erase_block(struct mtd_info *mtd, int page)
 	write_nop(docptr);
 	poll_status(doc);
 	write_nop(docptr);
+
+	return nand->waitfunc(mtd, nand);
 }
 
 static int write_page(struct mtd_info *mtd, struct nand_chip *nand,
@@ -1236,7 +1238,7 @@ static void __init init_mtd_structs(struct mtd_info *mtd)
 	nand->block_markbad = docg4_block_markbad;
 	nand->read_buf = docg4_read_buf;
 	nand->write_buf = docg4_write_buf16;
-	nand->erase_cmd = docg4_erase_block;
+	nand->erase = docg4_erase_block;
 	nand->ecc.read_page = docg4_read_page;
 	nand->ecc.write_page = docg4_write_page;
 	nand->ecc.read_page_raw = docg4_read_page_raw;
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index f6c5685b79a..7853b9b0a05 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2617,18 +2617,20 @@ out:
 }
 
 /**
- * single_erase_cmd - [GENERIC] NAND standard block erase command function
+ * single_erase - [GENERIC] NAND standard block erase command function
  * @mtd: MTD device structure
  * @page: the page address of the block which will be erased
  *
- * Standard erase command for NAND chips.
+ * Standard erase command for NAND chips. Returns NAND status.
  */
-static void single_erase_cmd(struct mtd_info *mtd, int page)
+static int single_erase(struct mtd_info *mtd, int page)
 {
 	struct nand_chip *chip = mtd->priv;
 	/* Send commands to erase a block */
 	chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page);
 	chip->cmdfunc(mtd, NAND_CMD_ERASE2, -1, -1);
+
+	return chip->waitfunc(mtd, chip);
 }
 
 /**
@@ -2709,9 +2711,7 @@ int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr,
 		    (page + pages_per_block))
 			chip->pagebuf = -1;
 
-		chip->erase_cmd(mtd, page & chip->pagemask);
-
-		status = chip->waitfunc(mtd, chip);
+		status = chip->erase(mtd, page & chip->pagemask);
 
 		/*
 		 * See if operation failed and additional status checks are
@@ -3684,7 +3684,7 @@ ident_done:
 	}
 
 	chip->badblockbits = 8;
-	chip->erase_cmd = single_erase_cmd;
+	chip->erase = single_erase;
 
 	/* Do not replace user supplied command function! */
 	if (mtd->writesize > 512 && chip->cmdfunc == nand_command)