mtd: rawnand: remove w90x900 driver

The ARM w90x900 platform is getting removed, so this driver is obsolete.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

drivers/mtd/nand/raw/Kconfig

@@ -351,14 +351,6 @@ config MTD_NAND_SOCRATES
 	help
 	  Enables support for NAND Flash chips wired onto Socrates board.
 
-config MTD_NAND_NUC900
-	tristate "Nuvoton NUC9xx/w90p910 NAND controller"
-	depends on ARCH_W90X900 || COMPILE_TEST
-	depends on HAS_IOMEM
-	help
-	  This enables the driver for the NAND Flash on evaluation board based
-	  on w90p910 / NUC9xx.
-
 source "drivers/mtd/nand/raw/ingenic/Kconfig"
 
 config MTD_NAND_FSMC

drivers/mtd/nand/raw/Makefile

@@ -41,7 +41,6 @@ obj-$(CONFIG_MTD_NAND_SH_FLCTL)		+= sh_flctl.o
 obj-$(CONFIG_MTD_NAND_MXC)		+= mxc_nand.o
 obj-$(CONFIG_MTD_NAND_SOCRATES)		+= socrates_nand.o
 obj-$(CONFIG_MTD_NAND_TXX9NDFMC)	+= txx9ndfmc.o
-obj-$(CONFIG_MTD_NAND_NUC900)		+= nuc900_nand.o
 obj-$(CONFIG_MTD_NAND_MPC5121_NFC)	+= mpc5121_nfc.o
 obj-$(CONFIG_MTD_NAND_VF610_NFC)	+= vf610_nfc.o
 obj-$(CONFIG_MTD_NAND_RICOH)		+= r852.o

drivers/mtd/nand/raw/nuc900_nand.c

-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright © 2009 Nuvoton technology corporation.
- *
- * Wan ZongShun <mcuos.com@gmail.com>
- */
-
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/platform_device.h>
-#include <linux/delay.h>
-#include <linux/clk.h>
-#include <linux/err.h>
-
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/rawnand.h>
-#include <linux/mtd/partitions.h>
-
-#define REG_FMICSR   	0x00
-#define REG_SMCSR    	0xa0
-#define REG_SMISR    	0xac
-#define REG_SMCMD    	0xb0
-#define REG_SMADDR   	0xb4
-#define REG_SMDATA   	0xb8
-
-#define RESET_FMI	0x01
-#define NAND_EN		0x08
-#define READYBUSY	(0x01 << 18)
-
-#define SWRST		0x01
-#define PSIZE		(0x01 << 3)
-#define DMARWEN		(0x03 << 1)
-#define BUSWID		(0x01 << 4)
-#define ECC4EN		(0x01 << 5)
-#define WP		(0x01 << 24)
-#define NANDCS		(0x01 << 25)
-#define ENDADDR		(0x01 << 31)
-
-#define read_data_reg(dev)		\
-	__raw_readl((dev)->reg + REG_SMDATA)
-
-#define write_data_reg(dev, val)	\
-	__raw_writel((val), (dev)->reg + REG_SMDATA)
-
-#define write_cmd_reg(dev, val)		\
-	__raw_writel((val), (dev)->reg + REG_SMCMD)
-
-#define write_addr_reg(dev, val)	\
-	__raw_writel((val), (dev)->reg + REG_SMADDR)
-
-struct nuc900_nand {
-	struct nand_chip chip;
-	void __iomem *reg;
-	struct clk *clk;
-	spinlock_t lock;
-};
-
-static inline struct nuc900_nand *mtd_to_nuc900(struct mtd_info *mtd)
-{
-	return container_of(mtd_to_nand(mtd), struct nuc900_nand, chip);
-}
-
-static const struct mtd_partition partitions[] = {
-	{
-	 .name = "NAND FS 0",
-	 .offset = 0,
-	 .size = 8 * 1024 * 1024
-	},
-	{
-	 .name = "NAND FS 1",
-	 .offset = MTDPART_OFS_APPEND,
-	 .size = MTDPART_SIZ_FULL
-	}
-};
-
-static unsigned char nuc900_nand_read_byte(struct nand_chip *chip)
-{
-	unsigned char ret;
-	struct nuc900_nand *nand = mtd_to_nuc900(nand_to_mtd(chip));
-
-	ret = (unsigned char)read_data_reg(nand);
-
-	return ret;
-}
-
-static void nuc900_nand_read_buf(struct nand_chip *chip,
-				 unsigned char *buf, int len)
-{
-	int i;
-	struct nuc900_nand *nand = mtd_to_nuc900(nand_to_mtd(chip));
-
-	for (i = 0; i < len; i++)
-		buf[i] = (unsigned char)read_data_reg(nand);
-}
-
-static void nuc900_nand_write_buf(struct nand_chip *chip,
-				  const unsigned char *buf, int len)
-{
-	int i;
-	struct nuc900_nand *nand = mtd_to_nuc900(nand_to_mtd(chip));
-
-	for (i = 0; i < len; i++)
-		write_data_reg(nand, buf[i]);
-}
-
-static int nuc900_check_rb(struct nuc900_nand *nand)
-{
-	unsigned int val;
-	spin_lock(&nand->lock);
-	val = __raw_readl(nand->reg + REG_SMISR);
-	val &= READYBUSY;
-	spin_unlock(&nand->lock);
-
-	return val;
-}
-
-static int nuc900_nand_devready(struct nand_chip *chip)
-{
-	struct nuc900_nand *nand = mtd_to_nuc900(nand_to_mtd(chip));
-	int ready;
-
-	ready = (nuc900_check_rb(nand)) ? 1 : 0;
-	return ready;
-}
-
-static void nuc900_nand_command_lp(struct nand_chip *chip,
-				   unsigned int command,
-				   int column, int page_addr)
-{
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct nuc900_nand *nand = mtd_to_nuc900(mtd);
-
-	if (command == NAND_CMD_READOOB) {
-		column += mtd->writesize;
-		command = NAND_CMD_READ0;
-	}
-
-	write_cmd_reg(nand, command & 0xff);
-
-	if (column != -1 || page_addr != -1) {
-
-		if (column != -1) {
-			if (chip->options & NAND_BUSWIDTH_16 &&
-					!nand_opcode_8bits(command))
-				column >>= 1;
-			write_addr_reg(nand, column);
-			write_addr_reg(nand, column >> 8 | ENDADDR);
-		}
-		if (page_addr != -1) {
-			write_addr_reg(nand, page_addr);
-
-			if (chip->options & NAND_ROW_ADDR_3) {
-				write_addr_reg(nand, page_addr >> 8);
-				write_addr_reg(nand, page_addr >> 16 | ENDADDR);
-			} else {
-				write_addr_reg(nand, page_addr >> 8 | ENDADDR);
-			}
-		}
-	}
-
-	switch (command) {
-	case NAND_CMD_CACHEDPROG:
-	case NAND_CMD_PAGEPROG:
-	case NAND_CMD_ERASE1:
-	case NAND_CMD_ERASE2:
-	case NAND_CMD_SEQIN:
-	case NAND_CMD_RNDIN:
-	case NAND_CMD_STATUS:
-		return;
-
-	case NAND_CMD_RESET:
-		if (chip->legacy.dev_ready)
-			break;
-		udelay(chip->legacy.chip_delay);
-
-		write_cmd_reg(nand, NAND_CMD_STATUS);
-		write_cmd_reg(nand, command);
-
-		while (!nuc900_check_rb(nand))
-			;
-
-		return;
-
-	case NAND_CMD_RNDOUT:
-		write_cmd_reg(nand, NAND_CMD_RNDOUTSTART);
-		return;
-
-	case NAND_CMD_READ0:
-		write_cmd_reg(nand, NAND_CMD_READSTART);
-		/* fall through */
-
-	default:
-
-		if (!chip->legacy.dev_ready) {
-			udelay(chip->legacy.chip_delay);
-			return;
-		}
-	}
-
-	/* Apply this short delay always to ensure that we do wait tWB in
-	 * any case on any machine. */
-	ndelay(100);
-
-	while (!chip->legacy.dev_ready(chip))
-		;
-}
-
-
-static void nuc900_nand_enable(struct nuc900_nand *nand)
-{
-	unsigned int val;
-	spin_lock(&nand->lock);
-	__raw_writel(RESET_FMI, (nand->reg + REG_FMICSR));
-
-	val = __raw_readl(nand->reg + REG_FMICSR);
-
-	if (!(val & NAND_EN))
-		__raw_writel(val | NAND_EN, nand->reg + REG_FMICSR);
-
-	val = __raw_readl(nand->reg + REG_SMCSR);
-
-	val &= ~(SWRST|PSIZE|DMARWEN|BUSWID|ECC4EN|NANDCS);
-	val |= WP;
-
-	__raw_writel(val, nand->reg + REG_SMCSR);
-
-	spin_unlock(&nand->lock);
-}
-
-static int nuc900_nand_probe(struct platform_device *pdev)
-{
-	struct nuc900_nand *nuc900_nand;
-	struct nand_chip *chip;
-	struct mtd_info *mtd;
-	struct resource *res;
-
-	nuc900_nand = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_nand),
-				   GFP_KERNEL);
-	if (!nuc900_nand)
-		return -ENOMEM;
-	chip = &(nuc900_nand->chip);
-	mtd = nand_to_mtd(chip);
-
-	mtd->dev.parent		= &pdev->dev;
-	spin_lock_init(&nuc900_nand->lock);
-
-	nuc900_nand->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(nuc900_nand->clk))
-		return -ENOENT;
-	clk_enable(nuc900_nand->clk);
-
-	chip->legacy.cmdfunc	= nuc900_nand_command_lp;
-	chip->legacy.dev_ready	= nuc900_nand_devready;
-	chip->legacy.read_byte	= nuc900_nand_read_byte;
-	chip->legacy.write_buf	= nuc900_nand_write_buf;
-	chip->legacy.read_buf	= nuc900_nand_read_buf;
-	chip->legacy.chip_delay	= 50;
-	chip->options		= 0;
-	chip->ecc.mode		= NAND_ECC_SOFT;
-	chip->ecc.algo		= NAND_ECC_HAMMING;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	nuc900_nand->reg = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(nuc900_nand->reg))
-		return PTR_ERR(nuc900_nand->reg);
-
-	nuc900_nand_enable(nuc900_nand);
-
-	if (nand_scan(chip, 1))
-		return -ENXIO;
-
-	mtd_device_register(mtd, partitions, ARRAY_SIZE(partitions));
-
-	platform_set_drvdata(pdev, nuc900_nand);
-
-	return 0;
-}
-
-static int nuc900_nand_remove(struct platform_device *pdev)
-{
-	struct nuc900_nand *nuc900_nand = platform_get_drvdata(pdev);
-
-	nand_release(&nuc900_nand->chip);
-	clk_disable(nuc900_nand->clk);
-
-	return 0;
-}
-
-static struct platform_driver nuc900_nand_driver = {
-	.probe		= nuc900_nand_probe,
-	.remove		= nuc900_nand_remove,
-	.driver		= {
-		.name	= "nuc900-fmi",
-	},
-};
-
-module_platform_driver(nuc900_nand_driver);
-
-MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
-MODULE_DESCRIPTION("w90p910/NUC9xx nand driver!");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:nuc900-fmi");