linux-kernel - [PATCH v4 31/35] mtd: rawnand: jz4740: convert driver to nand

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Message-Id: <20180720151527.16038-32-miquel.raynal@bootlin.com>
Date:   Fri, 20 Jul 2018 17:15:23 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Wenyou Yang <wenyou.yang@...rochip.com>,
        Josh Wu <rainyfeeling@...look.com>,
        Tudor Ambarus <Tudor.Ambarus@...rochip.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Kamal Dasu <kdasu.kdev@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Han Xu <han.xu@....com>,
        Harvey Hunt <harveyhuntnexus@...il.com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Sylvain Lemieux <slemieux.tyco@...il.com>,
        Xiaolei Li <xiaolei.li@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>,
        Mans Rullgard <mans@...sr.com>, Stefan Agner <stefan@...er.ch>
Cc:     linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH v4 31/35] mtd: rawnand: jz4740: convert driver to nand_scan()

Two helpers have been added to the core to make ECC-related
configuration between the detection phase and the final NAND scan. Use
these hooks and convert the driver to just use nand_scan() instead of
both nand_scan_ident() and nand_scan_tail().

Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 drivers/mtd/nand/raw/jz4740_nand.c | 46 ++++++++++++++++++++++++--------------
 1 file changed, 29 insertions(+), 17 deletions(-)

diff --git a/drivers/mtd/nand/raw/jz4740_nand.c b/drivers/mtd/nand/raw/jz4740_nand.c
index 9bb8a89e09f9..8f821fdf8a1c 100644
--- a/drivers/mtd/nand/raw/jz4740_nand.c
+++ b/drivers/mtd/nand/raw/jz4740_nand.c
@@ -59,6 +59,7 @@
 
 struct jz_nand {
 	struct nand_chip chip;
+	struct platform_device *pdev;
 	void __iomem *base;
 	struct resource *mem;
 
@@ -329,8 +330,8 @@ static int jz_nand_detect_bank(struct platform_device *pdev,
 	writel(ctrl, nand->base + JZ_REG_NAND_CTRL);
 
 	if (chipnr == 0) {
-		/* Detect first chip. */
-		ret = nand_scan_ident(mtd, 1, NULL);
+		/* Detect the first chip and register it */
+		ret = nand_scan(mtd, 1);
 		if (ret)
 			goto notfound_id;
 
@@ -367,6 +368,25 @@ static int jz_nand_detect_bank(struct platform_device *pdev,
 	return ret;
 }
 
+static int jz_nand_attach_chip(struct nand_chip *chip)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	struct jz_nand *nand = mtd_to_jz_nand(mtd);
+	struct device *dev = mtd->dev.parent;
+	struct jz_nand_platform_data *pdata = dev_get_platdata(dev);
+
+	if (pdata && pdata->ident_callback) {
+		pdata->ident_callback(nand->pdev, mtd, &pdata->partitions,
+				      &pdata->num_partitions);
+	}
+
+	return 0;
+}
+
+static const struct nand_controller_ops jz_nand_controller_ops = {
+	.attach_chip = jz_nand_attach_chip,
+};
+
 static int jz_nand_probe(struct platform_device *pdev)
 {
 	int ret;
@@ -397,6 +417,7 @@ static int jz_nand_probe(struct platform_device *pdev)
 	mtd		= nand_to_mtd(chip);
 	mtd->dev.parent = &pdev->dev;
 	mtd->name	= "jz4740-nand";
+	nand->pdev	= pdev;
 
 	chip->ecc.hwctl		= jz_nand_hwctl;
 	chip->ecc.calculate	= jz_nand_calculate_ecc_rs;
@@ -410,6 +431,7 @@ static int jz_nand_probe(struct platform_device *pdev)
 	chip->chip_delay = 50;
 	chip->cmd_ctrl = jz_nand_cmd_ctrl;
 	chip->select_chip = jz_nand_select_chip;
+	chip->dummy_controller.ops = &jz_nand_controller_ops;
 
 	if (nand->busy_gpio)
 		chip->dev_ready = jz_nand_dev_ready;
@@ -450,20 +472,10 @@ static int jz_nand_probe(struct platform_device *pdev)
 		else
 			nand->banks[chipnr] = 0;
 	}
+
 	if (chipnr == 0) {
 		dev_err(&pdev->dev, "No NAND chips found\n");
-		goto err_iounmap_mmio;
-	}
-
-	if (pdata && pdata->ident_callback) {
-		pdata->ident_callback(pdev, mtd, &pdata->partitions,
-					&pdata->num_partitions);
-	}
-
-	ret = nand_scan_tail(mtd);
-	if (ret) {
-		dev_err(&pdev->dev,  "Failed to scan NAND\n");
-		goto err_unclaim_banks;
+		goto err_nand_release;
 	}
 
 	ret = mtd_device_register(mtd, pdata ? pdata->partitions : NULL,
@@ -471,15 +483,13 @@ static int jz_nand_probe(struct platform_device *pdev)
 
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to add mtd device\n");
-		goto err_nand_release;
+		goto err_unclaim_banks;
 	}
 
 	dev_info(&pdev->dev, "Successfully registered JZ4740 NAND driver\n");
 
 	return 0;
 
-err_nand_release:
-	nand_release(mtd);
 err_unclaim_banks:
 	while (chipnr--) {
 		unsigned char bank = nand->banks[chipnr];
@@ -487,6 +497,8 @@ static int jz_nand_probe(struct platform_device *pdev)
 					 nand->bank_base[bank - 1]);
 	}
 	writel(0, nand->base + JZ_REG_NAND_CTRL);
+err_nand_release:
+	nand_release(mtd);
 err_iounmap_mmio:
 	jz_nand_iounmap_resource(nand->mem, nand->base);
 err_free:
-- 
2.14.1