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Message-Id: <1457344062-11633-9-git-send-email-boris.brezillon@free-electrons.com>
Date: Mon, 7 Mar 2016 10:46:58 +0100
From: Boris Brezillon <boris.brezillon@...e-electrons.com>
To: David Woodhouse <dwmw2@...radead.org>,
Brian Norris <computersforpeace@...il.com>,
linux-mtd@...ts.infradead.org
Cc: Daniel Mack <daniel@...que.org>,
Haojian Zhuang <haojian.zhuang@...il.com>,
Robert Jarzmik <robert.jarzmik@...e.fr>,
Kukjin Kim <kgene@...nel.org>,
Krzysztof Kozlowski <k.kozlowski@...sung.com>,
linux-samsung-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
Nicolas Ferre <nicolas.ferre@...el.com>,
Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
Wenyou Yang <wenyou.yang@...el.com>,
Josh Wu <rainyfeeling@...look.com>,
Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
Maxime Ripard <maxime.ripard@...e-electrons.com>,
Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...glegroups.com,
Stefan Agner <stefan@...er.ch>,
Kyungmin Park <kyungmin.park@...sung.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
punnaiah choudary kalluri <punnaia@...inx.com>,
Priit Laes <plaes@...es.org>,
Kamal Dasu <kdasu.kdev@...il.com>,
bcm-kernel-feedback-list@...adcom.com, linux-api@...r.kernel.org,
Harvey Hunt <harvey.hunt@...tec.com>,
Boris Brezillon <boris.brezillon@...e-electrons.com>
Subject: [PATCH v4 08/52] mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate
The mtd_ooblayout_xxx() helper functions have been added to avoid direct
accesses to the ecclayout field, and thus ease for future reworks.
Use these helpers in all places where the oobfree[] and eccpos[] arrays
where directly accessed.
Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
---
drivers/mtd/nand/atmel_nand.c | 48 ++++++++++++++++++++++++++-----------------
1 file changed, 29 insertions(+), 19 deletions(-)
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 20cbaab..ac3dd3f 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -836,13 +836,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
pos, bit_pos, err_byte, *(buf + byte_pos));
} else {
+ struct mtd_oob_region oobregion;
+
/* Bit flip in OOB area */
tmp = sector_num * nand_chip->ecc.bytes
+ (byte_pos - sector_size);
err_byte = ecc[tmp];
ecc[tmp] ^= (1 << bit_pos);
- pos = tmp + nand_chip->ecc.layout->eccpos[0];
+ mtd_ooblayout_ecc(mtd, 0, &oobregion);
+ pos = tmp + oobregion.offset;
dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
pos, bit_pos, err_byte, ecc[tmp]);
}
@@ -931,7 +934,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
struct atmel_nand_host *host = nand_get_controller_data(chip);
int eccsize = chip->ecc.size * chip->ecc.steps;
uint8_t *oob = chip->oob_poi;
- uint32_t *eccpos = chip->ecc.layout->eccpos;
uint32_t stat;
unsigned long end_time;
int bitflips = 0;
@@ -953,7 +955,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
stat = pmecc_readl_relaxed(host->ecc, ISR);
if (stat != 0) {
- bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
+ struct mtd_oob_region oobregion;
+
+ mtd_ooblayout_ecc(mtd, 0, &oobregion);
+ bitflips = pmecc_correction(mtd, stat, buf,
+ &oob[oobregion.offset]);
if (bitflips < 0)
/* uncorrectable errors */
return 0;
@@ -967,8 +973,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
int page)
{
struct atmel_nand_host *host = nand_get_controller_data(chip);
- uint32_t *eccpos = chip->ecc.layout->eccpos;
- int i, j;
+ struct mtd_oob_region oobregion = { };
+ int i, j, section = 0;
unsigned long end_time;
if (!host->nfc || !host->nfc->write_by_sram) {
@@ -987,11 +993,12 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
for (i = 0; i < chip->ecc.steps; i++) {
for (j = 0; j < chip->ecc.bytes; j++) {
- int pos;
+ if (!oobregion.length)
+ mtd_ooblayout_ecc(mtd, section++, &oobregion);
- pos = i * chip->ecc.bytes + j;
- chip->oob_poi[eccpos[pos]] =
+ chip->oob_poi[oobregion.offset++] =
pmecc_readb_ecc_relaxed(host->ecc, i, j);
+ oobregion.length--;
}
}
chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
@@ -1005,6 +1012,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
uint32_t val = 0;
struct nand_ecclayout *ecc_layout;
+ struct mtd_oob_region oobregion;
pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
@@ -1056,9 +1064,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
ecc_layout = nand_chip->ecc.layout;
pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
- pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
+ mtd_ooblayout_ecc(mtd, 0, &oobregion);
+ pmecc_writel(host->ecc, SADDR, oobregion.offset);
pmecc_writel(host->ecc, EADDR,
- ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
+ oobregion.offset + ecc_layout->eccbytes - 1);
/* See datasheet about PMECC Clock Control Register */
pmecc_writel(host->ecc, CLK, 2);
pmecc_writel(host->ecc, IDR, 0xff);
@@ -1359,12 +1368,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
{
int eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
- uint32_t *eccpos = chip->ecc.layout->eccpos;
uint8_t *p = buf;
uint8_t *oob = chip->oob_poi;
uint8_t *ecc_pos;
int stat;
unsigned int max_bitflips = 0;
+ struct mtd_oob_region oobregion = {};
/*
* Errata: ALE is incorrectly wired up to the ECC controller
@@ -1382,19 +1391,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
chip->read_buf(mtd, p, eccsize);
/* move to ECC position if needed */
- if (eccpos[0] != 0) {
- /* This only works on large pages
- * because the ECC controller waits for
- * NAND_CMD_RNDOUTSTART after the
- * NAND_CMD_RNDOUT.
- * anyway, for small pages, the eccpos[0] == 0
+ mtd_ooblayout_ecc(mtd, 0, &oobregion);
+ if (oobregion.offset != 0) {
+ /*
+ * This only works on large pages because the ECC controller
+ * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
+ * Anyway, for small pages, the first ECC byte is at offset
+ * 0 in the OOB area.
*/
chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
- mtd->writesize + eccpos[0], -1);
+ mtd->writesize + oobregion.offset, -1);
}
/* the ECC controller needs to read the ECC just after the data */
- ecc_pos = oob + eccpos[0];
+ ecc_pos = oob + oobregion.offset;
chip->read_buf(mtd, ecc_pos, eccbytes);
/* check if there's an error */
--
2.1.4
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