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Message-Id: <20180919225255.31175-3-jmkrzyszt@gmail.com>
Date: Thu, 20 Sep 2018 00:52:54 +0200
From: Janusz Krzysztofik <jmkrzyszt@...il.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: Boris Brezillon <boris.brezillon@...tlin.com>,
Richard Weinberger <richard@....at>,
David Woodhouse <dwmw2@...radead.org>,
Brian Norris <computersforpeace@...il.com>,
Marek Vasut <marek.vasut@...il.com>,
Janusz Krzysztofik <jmkrzyszt@...il.com>,
linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v5 2/3] mtd: rawnand: ams-delta: Use private structure
Introduce a driver private structure and allocate it on device probe.
Use it for storing nand_chip structure, GPIO descriptors prevoiusly
stored in static variables as well as io_base pointer previously passed
as nand controller data or platform driver data. Subsequent patches
may populate the structure with more members as needed.
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@...il.com>
Reviewed-by: Boris Brezillon <boris.brezillon@...tlin.com>
---
drivers/mtd/nand/raw/ams-delta.c | 122 +++++++++++++++++++++------------------
1 file changed, 66 insertions(+), 56 deletions(-)
diff --git a/drivers/mtd/nand/raw/ams-delta.c b/drivers/mtd/nand/raw/ams-delta.c
index efe12066dfbc..eb2aeadc3b65 100644
--- a/drivers/mtd/nand/raw/ams-delta.c
+++ b/drivers/mtd/nand/raw/ams-delta.c
@@ -34,14 +34,18 @@
/*
* MTD structure for E3 (Delta)
*/
-static struct mtd_info *ams_delta_mtd = NULL;
-static struct gpio_desc *gpiod_rdy;
-static struct gpio_desc *gpiod_nce;
-static struct gpio_desc *gpiod_nre;
-static struct gpio_desc *gpiod_nwp;
-static struct gpio_desc *gpiod_nwe;
-static struct gpio_desc *gpiod_ale;
-static struct gpio_desc *gpiod_cle;
+
+struct ams_delta_nand {
+ struct nand_chip nand_chip;
+ struct gpio_desc *gpiod_rdy;
+ struct gpio_desc *gpiod_nce;
+ struct gpio_desc *gpiod_nre;
+ struct gpio_desc *gpiod_nwp;
+ struct gpio_desc *gpiod_nwe;
+ struct gpio_desc *gpiod_ale;
+ struct gpio_desc *gpiod_cle;
+ void __iomem *io_base;
+};
/*
* Define partitions for flash devices
@@ -70,25 +74,27 @@ static const struct mtd_partition partition_info[] = {
static void ams_delta_write_byte(struct nand_chip *this, u_char byte)
{
- void __iomem *io_base = (void __iomem *)nand_get_controller_data(this);
+ struct ams_delta_nand *priv = nand_get_controller_data(this);
+ void __iomem *io_base = priv->io_base;
writew(0, io_base + OMAP_MPUIO_IO_CNTL);
writew(byte, this->legacy.IO_ADDR_W);
- gpiod_set_value(gpiod_nwe, 0);
+ gpiod_set_value(priv->gpiod_nwe, 0);
ndelay(40);
- gpiod_set_value(gpiod_nwe, 1);
+ gpiod_set_value(priv->gpiod_nwe, 1);
}
static u_char ams_delta_read_byte(struct nand_chip *this)
{
u_char res;
- void __iomem *io_base = (void __iomem *)nand_get_controller_data(this);
+ struct ams_delta_nand *priv = nand_get_controller_data(this);
+ void __iomem *io_base = priv->io_base;
- gpiod_set_value(gpiod_nre, 0);
+ gpiod_set_value(priv->gpiod_nre, 0);
ndelay(40);
writew(~0, io_base + OMAP_MPUIO_IO_CNTL);
res = readw(this->legacy.IO_ADDR_R);
- gpiod_set_value(gpiod_nre, 1);
+ gpiod_set_value(priv->gpiod_nre, 1);
return res;
}
@@ -121,11 +127,12 @@ static void ams_delta_read_buf(struct nand_chip *this, u_char *buf, int len)
static void ams_delta_hwcontrol(struct nand_chip *this, int cmd,
unsigned int ctrl)
{
+ struct ams_delta_nand *priv = nand_get_controller_data(this);
if (ctrl & NAND_CTRL_CHANGE) {
- gpiod_set_value(gpiod_nce, !(ctrl & NAND_NCE));
- gpiod_set_value(gpiod_cle, !!(ctrl & NAND_CLE));
- gpiod_set_value(gpiod_ale, !!(ctrl & NAND_ALE));
+ gpiod_set_value(priv->gpiod_nce, !(ctrl & NAND_NCE));
+ gpiod_set_value(priv->gpiod_cle, !!(ctrl & NAND_CLE));
+ gpiod_set_value(priv->gpiod_ale, !!(ctrl & NAND_ALE));
}
if (cmd != NAND_CMD_NONE)
@@ -134,7 +141,9 @@ static void ams_delta_hwcontrol(struct nand_chip *this, int cmd,
static int ams_delta_nand_ready(struct nand_chip *this)
{
- return gpiod_get_value(gpiod_rdy);
+ struct ams_delta_nand *priv = nand_get_controller_data(this);
+
+ return gpiod_get_value(priv->gpiod_rdy);
}
@@ -143,7 +152,9 @@ static int ams_delta_nand_ready(struct nand_chip *this)
*/
static int ams_delta_init(struct platform_device *pdev)
{
+ struct ams_delta_nand *priv;
struct nand_chip *this;
+ struct mtd_info *mtd;
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
void __iomem *io_base;
int err = 0;
@@ -152,15 +163,16 @@ static int ams_delta_init(struct platform_device *pdev)
return -ENXIO;
/* Allocate memory for MTD device structure and private data */
- this = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
- if (!this) {
+ priv = devm_kzalloc(&pdev->dev, sizeof(struct ams_delta_nand),
+ GFP_KERNEL);
+ if (!priv) {
pr_warn("Unable to allocate E3 NAND MTD device structure.\n");
- err = -ENOMEM;
- goto out;
+ return -ENOMEM;
}
+ this = &priv->nand_chip;
- ams_delta_mtd = nand_to_mtd(this);
- ams_delta_mtd->dev.parent = &pdev->dev;
+ mtd = nand_to_mtd(this);
+ mtd->dev.parent = &pdev->dev;
/*
* Don't try to request the memory region from here,
@@ -175,7 +187,8 @@ static int ams_delta_init(struct platform_device *pdev)
goto out_free;
}
- nand_set_controller_data(this, (void *)io_base);
+ priv->io_base = io_base;
+ nand_set_controller_data(this, priv);
/* Set address of NAND IO lines */
this->legacy.IO_ADDR_R = io_base + OMAP_MPUIO_INPUT_LATCH;
@@ -185,14 +198,14 @@ static int ams_delta_init(struct platform_device *pdev)
this->legacy.read_buf = ams_delta_read_buf;
this->legacy.cmd_ctrl = ams_delta_hwcontrol;
- gpiod_rdy = devm_gpiod_get_optional(&pdev->dev, "rdy", GPIOD_IN);
- if (IS_ERR(gpiod_rdy)) {
- err = PTR_ERR(gpiod_rdy);
+ priv->gpiod_rdy = devm_gpiod_get_optional(&pdev->dev, "rdy", GPIOD_IN);
+ if (IS_ERR(priv->gpiod_rdy)) {
+ err = PTR_ERR(priv->gpiod_rdy);
dev_warn(&pdev->dev, "RDY GPIO request failed (%d)\n", err);
goto out_mtd;
}
- if (gpiod_rdy)
+ if (priv->gpiod_rdy)
this->legacy.dev_ready = ams_delta_nand_ready;
/* 25 us command delay time */
@@ -200,47 +213,47 @@ static int ams_delta_init(struct platform_device *pdev)
this->ecc.mode = NAND_ECC_SOFT;
this->ecc.algo = NAND_ECC_HAMMING;
- platform_set_drvdata(pdev, io_base);
+ platform_set_drvdata(pdev, priv);
/* Set chip enabled, but */
- gpiod_nwp = devm_gpiod_get(&pdev->dev, "nwp", GPIOD_OUT_HIGH);
- if (IS_ERR(gpiod_nwp)) {
- err = PTR_ERR(gpiod_nwp);
+ priv->gpiod_nwp = devm_gpiod_get(&pdev->dev, "nwp", GPIOD_OUT_HIGH);
+ if (IS_ERR(priv->gpiod_nwp)) {
+ err = PTR_ERR(priv->gpiod_nwp);
dev_err(&pdev->dev, "NWP GPIO request failed (%d)\n", err);
goto out_mtd;
}
- gpiod_nce = devm_gpiod_get(&pdev->dev, "nce", GPIOD_OUT_HIGH);
- if (IS_ERR(gpiod_nce)) {
- err = PTR_ERR(gpiod_nce);
+ priv->gpiod_nce = devm_gpiod_get(&pdev->dev, "nce", GPIOD_OUT_HIGH);
+ if (IS_ERR(priv->gpiod_nce)) {
+ err = PTR_ERR(priv->gpiod_nce);
dev_err(&pdev->dev, "NCE GPIO request failed (%d)\n", err);
goto out_mtd;
}
- gpiod_nre = devm_gpiod_get(&pdev->dev, "nre", GPIOD_OUT_HIGH);
- if (IS_ERR(gpiod_nre)) {
- err = PTR_ERR(gpiod_nre);
+ priv->gpiod_nre = devm_gpiod_get(&pdev->dev, "nre", GPIOD_OUT_HIGH);
+ if (IS_ERR(priv->gpiod_nre)) {
+ err = PTR_ERR(priv->gpiod_nre);
dev_err(&pdev->dev, "NRE GPIO request failed (%d)\n", err);
goto out_mtd;
}
- gpiod_nwe = devm_gpiod_get(&pdev->dev, "nwe", GPIOD_OUT_HIGH);
- if (IS_ERR(gpiod_nwe)) {
- err = PTR_ERR(gpiod_nwe);
+ priv->gpiod_nwe = devm_gpiod_get(&pdev->dev, "nwe", GPIOD_OUT_HIGH);
+ if (IS_ERR(priv->gpiod_nwe)) {
+ err = PTR_ERR(priv->gpiod_nwe);
dev_err(&pdev->dev, "NWE GPIO request failed (%d)\n", err);
goto out_mtd;
}
- gpiod_ale = devm_gpiod_get(&pdev->dev, "ale", GPIOD_OUT_LOW);
- if (IS_ERR(gpiod_ale)) {
- err = PTR_ERR(gpiod_ale);
+ priv->gpiod_ale = devm_gpiod_get(&pdev->dev, "ale", GPIOD_OUT_LOW);
+ if (IS_ERR(priv->gpiod_ale)) {
+ err = PTR_ERR(priv->gpiod_ale);
dev_err(&pdev->dev, "ALE GPIO request failed (%d)\n", err);
goto out_mtd;
}
- gpiod_cle = devm_gpiod_get(&pdev->dev, "cle", GPIOD_OUT_LOW);
- if (IS_ERR(gpiod_cle)) {
- err = PTR_ERR(gpiod_cle);
+ priv->gpiod_cle = devm_gpiod_get(&pdev->dev, "cle", GPIOD_OUT_LOW);
+ if (IS_ERR(priv->gpiod_cle)) {
+ err = PTR_ERR(priv->gpiod_cle);
dev_err(&pdev->dev, "CLE GPIO request failed (%d)\n", err);
goto out_mtd;
}
@@ -251,15 +264,13 @@ static int ams_delta_init(struct platform_device *pdev)
goto out_mtd;
/* Register the partitions */
- mtd_device_register(ams_delta_mtd, partition_info,
- ARRAY_SIZE(partition_info));
+ mtd_device_register(mtd, partition_info, ARRAY_SIZE(partition_info));
goto out;
out_mtd:
iounmap(io_base);
out_free:
- kfree(this);
out:
return err;
}
@@ -269,16 +280,15 @@ static int ams_delta_init(struct platform_device *pdev)
*/
static int ams_delta_cleanup(struct platform_device *pdev)
{
- void __iomem *io_base = platform_get_drvdata(pdev);
+ struct ams_delta_nand *priv = platform_get_drvdata(pdev);
+ struct mtd_info *mtd = nand_to_mtd(&priv->nand_chip);
+ void __iomem *io_base = priv->io_base;
/* Release resources, unregister device */
- nand_release(mtd_to_nand(ams_delta_mtd));
+ nand_release(mtd_to_nand(mtd));
iounmap(io_base);
- /* Free the MTD device structure */
- kfree(mtd_to_nand(ams_delta_mtd));
-
return 0;
}
--
2.16.4
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