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Subject[PATCH v4 32/35] mtd: rawnand: tegra: convert driver to nand_scan()
Date
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@bootlin.com>
---
drivers/mtd/nand/raw/tegra_nand.c | 162 +++++++++++++++++++++-----------------
1 file changed, 88 insertions(+), 74 deletions(-)

diff --git a/drivers/mtd/nand/raw/tegra_nand.c b/drivers/mtd/nand/raw/tegra_nand.c
index 31c0d9ca9d23..c40a53066cee 100644
--- a/drivers/mtd/nand/raw/tegra_nand.c
+++ b/drivers/mtd/nand/raw/tegra_nand.c
@@ -906,74 +906,13 @@ static int tegra_nand_select_strength(struct nand_chip *chip, int oobsize)
bits_per_step, oobsize);
}

-static int tegra_nand_chips_init(struct device *dev,
- struct tegra_nand_controller *ctrl)
+static int tegra_nand_attach_chip(struct nand_chip *chip)
{
- struct device_node *np = dev->of_node;
- struct device_node *np_nand;
- int nsels, nchips = of_get_child_count(np);
- struct tegra_nand_chip *nand;
- struct mtd_info *mtd;
- struct nand_chip *chip;
+ struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
+ struct tegra_nand_chip *nand = to_tegra_chip(chip);
+ struct mtd_info *mtd = nand_to_mtd(chip);
int bits_per_step;
int ret;
- u32 cs;
-
- if (nchips != 1) {
- dev_err(dev, "Currently only one NAND chip supported\n");
- return -EINVAL;
- }
-
- np_nand = of_get_next_child(np, NULL);
-
- nsels = of_property_count_elems_of_size(np_nand, "reg", sizeof(u32));
- if (nsels != 1) {
- dev_err(dev, "Missing/invalid reg property\n");
- return -EINVAL;
- }
-
- /* Retrieve CS id, currently only single die NAND supported */
- ret = of_property_read_u32(np_nand, "reg", &cs);
- if (ret) {
- dev_err(dev, "could not retrieve reg property: %d\n", ret);
- return ret;
- }
-
- nand = devm_kzalloc(dev, sizeof(*nand), GFP_KERNEL);
- if (!nand)
- return -ENOMEM;
-
- nand->cs[0] = cs;
-
- nand->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_LOW);
-
- if (IS_ERR(nand->wp_gpio)) {
- ret = PTR_ERR(nand->wp_gpio);
- dev_err(dev, "Failed to request WP GPIO: %d\n", ret);
- return ret;
- }
-
- chip = &nand->chip;
- chip->controller = &ctrl->controller;
-
- mtd = nand_to_mtd(chip);
-
- mtd->dev.parent = dev;
- mtd->owner = THIS_MODULE;
-
- nand_set_flash_node(chip, np_nand);
-
- if (!mtd->name)
- mtd->name = "tegra_nand";
-
- chip->options = NAND_NO_SUBPAGE_WRITE | NAND_USE_BOUNCE_BUFFER;
- chip->exec_op = tegra_nand_exec_op;
- chip->select_chip = tegra_nand_select_chip;
- chip->setup_data_interface = tegra_nand_setup_data_interface;
-
- ret = nand_scan_ident(mtd, 1, NULL);
- if (ret)
- return ret;

if (chip->bbt_options & NAND_BBT_USE_FLASH)
chip->bbt_options |= NAND_BBT_NO_OOB;
@@ -982,7 +921,8 @@ static int tegra_nand_chips_init(struct device *dev,
chip->ecc.size = 512;
chip->ecc.steps = mtd->writesize / chip->ecc.size;
if (chip->ecc_step_ds != 512) {
- dev_err(dev, "Unsupported step size %d\n", chip->ecc_step_ds);
+ dev_err(ctrl->dev, "Unsupported step size %d\n",
+ chip->ecc_step_ds);
return -EINVAL;
}

@@ -1004,14 +944,15 @@ static int tegra_nand_chips_init(struct device *dev,
}

if (chip->ecc.algo == NAND_ECC_BCH && mtd->writesize < 2048) {
- dev_err(dev, "BCH supports 2K or 4K page size only\n");
+ dev_err(ctrl->dev, "BCH supports 2K or 4K page size only\n");
return -EINVAL;
}

if (!chip->ecc.strength) {
ret = tegra_nand_select_strength(chip, mtd->oobsize);
if (ret < 0) {
- dev_err(dev, "No valid strength found, minimum %d\n",
+ dev_err(ctrl->dev,
+ "No valid strength found, minimum %d\n",
chip->ecc_strength_ds);
return ret;
}
@@ -1039,7 +980,7 @@ static int tegra_nand_chips_init(struct device *dev,
nand->config_ecc |= CONFIG_TVAL_8;
break;
default:
- dev_err(dev, "ECC strength %d not supported\n",
+ dev_err(ctrl->dev, "ECC strength %d not supported\n",
chip->ecc.strength);
return -EINVAL;
}
@@ -1062,17 +1003,17 @@ static int tegra_nand_chips_init(struct device *dev,
nand->bch_config |= BCH_TVAL_16;
break;
default:
- dev_err(dev, "ECC strength %d not supported\n",
+ dev_err(ctrl->dev, "ECC strength %d not supported\n",
chip->ecc.strength);
return -EINVAL;
}
break;
default:
- dev_err(dev, "ECC algorithm not supported\n");
+ dev_err(ctrl->dev, "ECC algorithm not supported\n");
return -EINVAL;
}

- dev_info(dev, "Using %s with strength %d per 512 byte step\n",
+ dev_info(ctrl->dev, "Using %s with strength %d per 512 byte step\n",
chip->ecc.algo == NAND_ECC_BCH ? "BCH" : "RS",
chip->ecc.strength);

@@ -1095,7 +1036,8 @@ static int tegra_nand_chips_init(struct device *dev,
nand->config |= CONFIG_PS_4096;
break;
default:
- dev_err(dev, "Unsupported writesize %d\n", mtd->writesize);
+ dev_err(ctrl->dev, "Unsupported writesize %d\n",
+ mtd->writesize);
return -ENODEV;
}

@@ -1106,7 +1048,79 @@ static int tegra_nand_chips_init(struct device *dev,
nand->config |= CONFIG_TAG_BYTE_SIZE(mtd->oobsize - 1);
writel_relaxed(nand->config, ctrl->regs + CONFIG);

- ret = nand_scan_tail(mtd);
+ return 0;
+}
+
+static const struct nand_controller_ops tegra_nand_controller_ops = {
+ .attach_chip = &tegra_nand_attach_chip,
+};
+
+static int tegra_nand_chips_init(struct device *dev,
+ struct tegra_nand_controller *ctrl)
+{
+ struct device_node *np = dev->of_node;
+ struct device_node *np_nand;
+ int nsels, nchips = of_get_child_count(np);
+ struct tegra_nand_chip *nand;
+ struct mtd_info *mtd;
+ struct nand_chip *chip;
+ int ret;
+ u32 cs;
+
+ if (nchips != 1) {
+ dev_err(dev, "Currently only one NAND chip supported\n");
+ return -EINVAL;
+ }
+
+ np_nand = of_get_next_child(np, NULL);
+
+ nsels = of_property_count_elems_of_size(np_nand, "reg", sizeof(u32));
+ if (nsels != 1) {
+ dev_err(dev, "Missing/invalid reg property\n");
+ return -EINVAL;
+ }
+
+ /* Retrieve CS id, currently only single die NAND supported */
+ ret = of_property_read_u32(np_nand, "reg", &cs);
+ if (ret) {
+ dev_err(dev, "could not retrieve reg property: %d\n", ret);
+ return ret;
+ }
+
+ nand = devm_kzalloc(dev, sizeof(*nand), GFP_KERNEL);
+ if (!nand)
+ return -ENOMEM;
+
+ nand->cs[0] = cs;
+
+ nand->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_LOW);
+
+ if (IS_ERR(nand->wp_gpio)) {
+ ret = PTR_ERR(nand->wp_gpio);
+ dev_err(dev, "Failed to request WP GPIO: %d\n", ret);
+ return ret;
+ }
+
+ chip = &nand->chip;
+ chip->controller = &ctrl->controller;
+ chip->controller->ops = &tegra_nand_controller_ops;
+
+ mtd = nand_to_mtd(chip);
+
+ mtd->dev.parent = dev;
+ mtd->owner = THIS_MODULE;
+
+ nand_set_flash_node(chip, np_nand);
+
+ if (!mtd->name)
+ mtd->name = "tegra_nand";
+
+ chip->options = NAND_NO_SUBPAGE_WRITE | NAND_USE_BOUNCE_BUFFER;
+ chip->exec_op = tegra_nand_exec_op;
+ chip->select_chip = tegra_nand_select_chip;
+ chip->setup_data_interface = tegra_nand_setup_data_interface;
+
+ ret = nand_scan(mtd, 1);
if (ret)
return ret;

--
2.14.1
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