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Date:   Fri,  8 Feb 2019 17:08:45 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-mtd@...ts.infradead.org,
        Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Boris Brezillon <bbrezillon@...nel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Brian Norris <computersforpeace@...il.com>,
        linux-kernel@...r.kernel.org, Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>
Subject: [PATCH 01/11] mtd: rawnand: denali: use nand_chip pointer more for internal functions

After the recent refactoring, the NAND driver hooks now take a pointer
to nand_chip. Add to_denali() in order to convert (struct nand_chip *)
to (struct denali_nand_info *) directly. It is more useful than the
current mtd_to_denali().

I changed some helper functions to take (struct nand_chip *). This will
avoid pointer conversion back and forth, and ease further development.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

 drivers/mtd/nand/raw/denali.c | 57 ++++++++++++++++++++++++-------------------
 1 file changed, 32 insertions(+), 25 deletions(-)

diff --git a/drivers/mtd/nand/raw/denali.c b/drivers/mtd/nand/raw/denali.c
index 24aeafc..4ac1314 100644
--- a/drivers/mtd/nand/raw/denali.c
+++ b/drivers/mtd/nand/raw/denali.c
@@ -47,6 +47,11 @@ static inline struct denali_nand_info *mtd_to_denali(struct mtd_info *mtd)
 	return container_of(mtd_to_nand(mtd), struct denali_nand_info, nand);
 }
 
+static struct denali_nand_info *to_denali(struct nand_chip *chip)
+{
+	return container_of(chip, struct denali_nand_info, nand);
+}
+
 /*
  * Direct Addressing - the slave address forms the control information (command
  * type, bank, block, and page address).  The slave data is the actual data to
@@ -282,12 +287,12 @@ static void denali_cmd_ctrl(struct nand_chip *chip, int dat, unsigned int ctrl)
 	denali->host_write(denali, DENALI_BANK(denali) | type, dat);
 }
 
-static int denali_check_erased_page(struct mtd_info *mtd,
-				    struct nand_chip *chip, uint8_t *buf,
+static int denali_check_erased_page(struct nand_chip *chip,
+				    struct denali_nand_info *denali, u8 *buf,
 				    unsigned long uncor_ecc_flags,
 				    unsigned int max_bitflips)
 {
-	struct denali_nand_info *denali = mtd_to_denali(mtd);
+	struct mtd_ecc_stats *ecc_stats = &nand_to_mtd(chip)->ecc_stats;
 	uint8_t *ecc_code = chip->oob_poi + denali->oob_skip_bytes;
 	int ecc_steps = chip->ecc.steps;
 	int ecc_size = chip->ecc.size;
@@ -303,9 +308,9 @@ static int denali_check_erased_page(struct mtd_info *mtd,
 						  NULL, 0,
 						  chip->ecc.strength);
 		if (stat < 0) {
-			mtd->ecc_stats.failed++;
+			ecc_stats->failed++;
 		} else {
-			mtd->ecc_stats.corrected += stat;
+			ecc_stats->corrected += stat;
 			max_bitflips = max_t(unsigned int, max_bitflips, stat);
 		}
 
@@ -316,11 +321,11 @@ static int denali_check_erased_page(struct mtd_info *mtd,
 	return max_bitflips;
 }
 
-static int denali_hw_ecc_fixup(struct mtd_info *mtd,
+static int denali_hw_ecc_fixup(struct nand_chip *chip,
 			       struct denali_nand_info *denali,
 			       unsigned long *uncor_ecc_flags)
 {
-	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct mtd_ecc_stats *ecc_stats = &nand_to_mtd(chip)->ecc_stats;
 	int bank = denali->active_bank;
 	uint32_t ecc_cor;
 	unsigned int max_bitflips;
@@ -346,16 +351,17 @@ static int denali_hw_ecc_fixup(struct mtd_info *mtd,
 	 * Unfortunately, we can not know the total number of corrected bits in
 	 * the page.  Increase the stats by max_bitflips. (compromised solution)
 	 */
-	mtd->ecc_stats.corrected += max_bitflips;
+	ecc_stats->corrected += max_bitflips;
 
 	return max_bitflips;
 }
 
-static int denali_sw_ecc_fixup(struct mtd_info *mtd,
+static int denali_sw_ecc_fixup(struct nand_chip *chip,
 			       struct denali_nand_info *denali,
 			       unsigned long *uncor_ecc_flags, uint8_t *buf)
 {
-	unsigned int ecc_size = denali->nand.ecc.size;
+	struct mtd_ecc_stats *ecc_stats = &nand_to_mtd(chip)->ecc_stats;
+	unsigned int ecc_size = chip->ecc.size;
 	unsigned int bitflips = 0;
 	unsigned int max_bitflips = 0;
 	uint32_t err_addr, err_cor_info;
@@ -404,7 +410,7 @@ static int denali_sw_ecc_fixup(struct mtd_info *mtd,
 			/* correct the ECC error */
 			flips_in_byte = hweight8(buf[offset] ^ err_cor_value);
 			buf[offset] ^= err_cor_value;
-			mtd->ecc_stats.corrected += flips_in_byte;
+			ecc_stats->corrected += flips_in_byte;
 			bitflips += flips_in_byte;
 
 			max_bitflips = max(max_bitflips, bitflips);
@@ -587,9 +593,11 @@ static int denali_dma_xfer(struct denali_nand_info *denali, void *buf,
 	return ret;
 }
 
-static int denali_data_xfer(struct denali_nand_info *denali, void *buf,
-			    size_t size, int page, int raw, int write)
+static int denali_data_xfer(struct nand_chip *chip, void *buf, size_t size,
+			    int page, int raw, int write)
 {
+	struct denali_nand_info *denali = to_denali(chip);
+
 	iowrite32(raw ? 0 : ECC_ENABLE__FLAG, denali->reg + ECC_ENABLE);
 	iowrite32(raw ? TRANSFER_SPARE_REG__FLAG : 0,
 		  denali->reg + TRANSFER_SPARE_REG);
@@ -678,7 +686,7 @@ static int denali_read_page_raw(struct nand_chip *chip, uint8_t *buf,
 	size_t size = writesize + oobsize;
 	int ret, i, pos, len;
 
-	ret = denali_data_xfer(denali, tmp_buf, size, page, 1, 0);
+	ret = denali_data_xfer(chip, tmp_buf, size, page, 1, 0);
 	if (ret)
 		return ret;
 
@@ -766,14 +774,14 @@ static int denali_read_page(struct nand_chip *chip, uint8_t *buf,
 	int stat = 0;
 	int ret;
 
-	ret = denali_data_xfer(denali, buf, mtd->writesize, page, 0, 0);
+	ret = denali_data_xfer(chip, buf, mtd->writesize, page, 0, 0);
 	if (ret && ret != -EBADMSG)
 		return ret;
 
 	if (denali->caps & DENALI_CAP_HW_ECC_FIXUP)
-		stat = denali_hw_ecc_fixup(mtd, denali, &uncor_ecc_flags);
+		stat = denali_hw_ecc_fixup(chip, denali, &uncor_ecc_flags);
 	else if (ret == -EBADMSG)
-		stat = denali_sw_ecc_fixup(mtd, denali, &uncor_ecc_flags, buf);
+		stat = denali_sw_ecc_fixup(chip, denali, &uncor_ecc_flags, buf);
 
 	if (stat < 0)
 		return stat;
@@ -783,7 +791,7 @@ static int denali_read_page(struct nand_chip *chip, uint8_t *buf,
 		if (ret)
 			return ret;
 
-		stat = denali_check_erased_page(mtd, chip, buf,
+		stat = denali_check_erased_page(chip, denali, buf,
 						uncor_ecc_flags, stat);
 	}
 
@@ -866,17 +874,16 @@ static int denali_write_page_raw(struct nand_chip *chip, const uint8_t *buf,
 		memcpy(tmp_buf + size - len, oob, len);
 	}
 
-	return denali_data_xfer(denali, tmp_buf, size, page, 1, 1);
+	return denali_data_xfer(chip, tmp_buf, size, page, 1, 1);
 }
 
 static int denali_write_page(struct nand_chip *chip, const uint8_t *buf,
 			     int oob_required, int page)
 {
 	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct denali_nand_info *denali = mtd_to_denali(mtd);
 
-	return denali_data_xfer(denali, (void *)buf, mtd->writesize,
-				page, 0, 1);
+	return denali_data_xfer(chip, (void *)buf, mtd->writesize, page,
+				0, 1);
 }
 
 static void denali_select_chip(struct nand_chip *chip, int cs)
@@ -1092,9 +1099,9 @@ static const struct mtd_ooblayout_ops denali_ooblayout_ops = {
 	.free = denali_ooblayout_free,
 };
 
-static int denali_multidev_fixup(struct denali_nand_info *denali)
+static int denali_multidev_fixup(struct nand_chip *chip)
 {
-	struct nand_chip *chip = &denali->nand;
+	struct denali_nand_info *denali = to_denali(chip);
 	struct mtd_info *mtd = nand_to_mtd(chip);
 
 	/*
@@ -1222,7 +1229,7 @@ static int denali_attach_chip(struct nand_chip *chip)
 	chip->ecc.read_oob = denali_read_oob;
 	chip->ecc.write_oob = denali_write_oob;
 
-	ret = denali_multidev_fixup(denali);
+	ret = denali_multidev_fixup(chip);
 	if (ret)
 		return ret;
 
-- 
2.7.4

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