mtd: nand: move raw NAND related code to the raw/ subdir

As part of the process of sharing more code between different NAND
based devices, we need to move all raw NAND related code to the raw/
subdirectory.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>

1 files changed, 0 insertions, 515 deletions

diff --git a/drivers/mtd/nand/au1550nd.c b/drivers/mtd/nand/au1550nd.c
deleted file mode 100644
index df0ef1f1e2f5..000000000000
--- a/drivers/mtd/nand/au1550nd.c
+++ /dev/null
@@ -1,515 +0,0 @@
-/*
- *  Copyright (C) 2004 Embedded Edge, LLC
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
-
-#include <linux/slab.h>
-#include <linux/gpio.h>
-#include <linux/module.h>
-#include <linux/interrupt.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/rawnand.h>
-#include <linux/mtd/partitions.h>
-#include <linux/platform_device.h>
-#include <asm/io.h>
-#include <asm/mach-au1x00/au1000.h>
-#include <asm/mach-au1x00/au1550nd.h>
-
-
-struct au1550nd_ctx {
-	struct nand_chip chip;
-
-	int cs;
-	void __iomem *base;
-	void (*write_byte)(struct mtd_info *, u_char);
-};
-
-/**
- * au_read_byte -  read one byte from the chip
- * @mtd:	MTD device structure
- *
- * read function for 8bit buswidth
- */
-static u_char au_read_byte(struct mtd_info *mtd)
-{
-	struct nand_chip *this = mtd_to_nand(mtd);
-	u_char ret = readb(this->IO_ADDR_R);
-	wmb(); /* drain writebuffer */
-	return ret;
-}
-
-/**
- * au_write_byte -  write one byte to the chip
- * @mtd:	MTD device structure
- * @byte:	pointer to data byte to write
- *
- * write function for 8it buswidth
- */
-static void au_write_byte(struct mtd_info *mtd, u_char byte)
-{
-	struct nand_chip *this = mtd_to_nand(mtd);
-	writeb(byte, this->IO_ADDR_W);
-	wmb(); /* drain writebuffer */
-}
-
-/**
- * au_read_byte16 -  read one byte endianness aware from the chip
- * @mtd:	MTD device structure
- *
- * read function for 16bit buswidth with endianness conversion
- */
-static u_char au_read_byte16(struct mtd_info *mtd)
-{
-	struct nand_chip *this = mtd_to_nand(mtd);
-	u_char ret = (u_char) cpu_to_le16(readw(this->IO_ADDR_R));
-	wmb(); /* drain writebuffer */
-	return ret;
-}
-
-/**
- * au_write_byte16 -  write one byte endianness aware to the chip
- * @mtd:	MTD device structure
- * @byte:	pointer to data byte to write
- *
- * write function for 16bit buswidth with endianness conversion
- */
-static void au_write_byte16(struct mtd_info *mtd, u_char byte)
-{
-	struct nand_chip *this = mtd_to_nand(mtd);
-	writew(le16_to_cpu((u16) byte), this->IO_ADDR_W);
-	wmb(); /* drain writebuffer */
-}
-
-/**
- * au_read_word -  read one word from the chip
- * @mtd:	MTD device structure
- *
- * read function for 16bit buswidth without endianness conversion
- */
-static u16 au_read_word(struct mtd_info *mtd)
-{
-	struct nand_chip *this = mtd_to_nand(mtd);
-	u16 ret = readw(this->IO_ADDR_R);
-	wmb(); /* drain writebuffer */
-	return ret;
-}
-
-/**
- * au_write_buf -  write buffer to chip
- * @mtd:	MTD device structure
- * @buf:	data buffer
- * @len:	number of bytes to write
- *
- * write function for 8bit buswidth
- */
-static void au_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
-{
-	int i;
-	struct nand_chip *this = mtd_to_nand(mtd);
-
-	for (i = 0; i < len; i++) {
-		writeb(buf[i], this->IO_ADDR_W);
-		wmb(); /* drain writebuffer */
-	}
-}
-
-/**
- * au_read_buf -  read chip data into buffer
- * @mtd:	MTD device structure
- * @buf:	buffer to store date
- * @len:	number of bytes to read
- *
- * read function for 8bit buswidth
- */
-static void au_read_buf(struct mtd_info *mtd, u_char *buf, int len)
-{
-	int i;
-	struct nand_chip *this = mtd_to_nand(mtd);
-
-	for (i = 0; i < len; i++) {
-		buf[i] = readb(this->IO_ADDR_R);
-		wmb(); /* drain writebuffer */
-	}
-}
-
-/**
- * au_write_buf16 -  write buffer to chip
- * @mtd:	MTD device structure
- * @buf:	data buffer
- * @len:	number of bytes to write
- *
- * write function for 16bit buswidth
- */
-static void au_write_buf16(struct mtd_info *mtd, const u_char *buf, int len)
-{
-	int i;
-	struct nand_chip *this = mtd_to_nand(mtd);
-	u16 *p = (u16 *) buf;
-	len >>= 1;
-
-	for (i = 0; i < len; i++) {
-		writew(p[i], this->IO_ADDR_W);
-		wmb(); /* drain writebuffer */
-	}
-
-}
-
-/**
- * au_read_buf16 -  read chip data into buffer
- * @mtd:	MTD device structure
- * @buf:	buffer to store date
- * @len:	number of bytes to read
- *
- * read function for 16bit buswidth
- */
-static void au_read_buf16(struct mtd_info *mtd, u_char *buf, int len)
-{
-	int i;
-	struct nand_chip *this = mtd_to_nand(mtd);
-	u16 *p = (u16 *) buf;
-	len >>= 1;
-
-	for (i = 0; i < len; i++) {
-		p[i] = readw(this->IO_ADDR_R);
-		wmb(); /* drain writebuffer */
-	}
-}
-
-/* Select the chip by setting nCE to low */
-#define NAND_CTL_SETNCE		1
-/* Deselect the chip by setting nCE to high */
-#define NAND_CTL_CLRNCE		2
-/* Select the command latch by setting CLE to high */
-#define NAND_CTL_SETCLE		3
-/* Deselect the command latch by setting CLE to low */
-#define NAND_CTL_CLRCLE		4
-/* Select the address latch by setting ALE to high */
-#define NAND_CTL_SETALE		5
-/* Deselect the address latch by setting ALE to low */
-#define NAND_CTL_CLRALE		6
-
-static void au1550_hwcontrol(struct mtd_info *mtd, int cmd)
-{
-	struct nand_chip *this = mtd_to_nand(mtd);
-	struct au1550nd_ctx *ctx = container_of(this, struct au1550nd_ctx,
-						chip);
-
-	switch (cmd) {
-
-	case NAND_CTL_SETCLE:
-		this->IO_ADDR_W = ctx->base + MEM_STNAND_CMD;
-		break;
-
-	case NAND_CTL_CLRCLE:
-		this->IO_ADDR_W = ctx->base + MEM_STNAND_DATA;
-		break;
-
-	case NAND_CTL_SETALE:
-		this->IO_ADDR_W = ctx->base + MEM_STNAND_ADDR;
-		break;
-
-	case NAND_CTL_CLRALE:
-		this->IO_ADDR_W = ctx->base + MEM_STNAND_DATA;
-		/* FIXME: Nobody knows why this is necessary,
-		 * but it works only that way */
-		udelay(1);
-		break;
-
-	case NAND_CTL_SETNCE:
-		/* assert (force assert) chip enable */
-		alchemy_wrsmem((1 << (4 + ctx->cs)), AU1000_MEM_STNDCTL);
-		break;
-
-	case NAND_CTL_CLRNCE:
-		/* deassert chip enable */
-		alchemy_wrsmem(0, AU1000_MEM_STNDCTL);
-		break;
-	}
-
-	this->IO_ADDR_R = this->IO_ADDR_W;
-
-	wmb(); /* Drain the writebuffer */
-}
-
-int au1550_device_ready(struct mtd_info *mtd)
-{
-	return (alchemy_rdsmem(AU1000_MEM_STSTAT) & 0x1) ? 1 : 0;
-}
-
-/**
- * au1550_select_chip - control -CE line
- *	Forbid driving -CE manually permitting the NAND controller to do this.
- *	Keeping -CE asserted during the whole sector reads interferes with the
- *	NOR flash and PCMCIA drivers as it causes contention on the static bus.
- *	We only have to hold -CE low for the NAND read commands since the flash
- *	chip needs it to be asserted during chip not ready time but the NAND
- *	controller keeps it released.
- *
- * @mtd:	MTD device structure
- * @chip:	chipnumber to select, -1 for deselect
- */
-static void au1550_select_chip(struct mtd_info *mtd, int chip)
-{
-}
-
-/**
- * au1550_command - Send command to NAND device
- * @mtd:	MTD device structure
- * @command:	the command to be sent
- * @column:	the column address for this command, -1 if none
- * @page_addr:	the page address for this command, -1 if none
- */
-static void au1550_command(struct mtd_info *mtd, unsigned command, int column, int page_addr)
-{
-	struct nand_chip *this = mtd_to_nand(mtd);
-	struct au1550nd_ctx *ctx = container_of(this, struct au1550nd_ctx,
-						chip);
-	int ce_override = 0, i;
-	unsigned long flags = 0;
-
-	/* Begin command latch cycle */
-	au1550_hwcontrol(mtd, NAND_CTL_SETCLE);
-	/*
-	 * Write out the command to the device.
-	 */
-	if (command == NAND_CMD_SEQIN) {
-		int readcmd;
-
-		if (column >= mtd->writesize) {
-			/* OOB area */
-			column -= mtd->writesize;
-			readcmd = NAND_CMD_READOOB;
-		} else if (column < 256) {
-			/* First 256 bytes --> READ0 */
-			readcmd = NAND_CMD_READ0;
-		} else {
-			column -= 256;
-			readcmd = NAND_CMD_READ1;
-		}
-		ctx->write_byte(mtd, readcmd);
-	}
-	ctx->write_byte(mtd, command);
-
-	/* Set ALE and clear CLE to start address cycle */
-	au1550_hwcontrol(mtd, NAND_CTL_CLRCLE);
-
-	if (column != -1 || page_addr != -1) {
-		au1550_hwcontrol(mtd, NAND_CTL_SETALE);
-
-		/* Serially input address */
-		if (column != -1) {
-			/* Adjust columns for 16 bit buswidth */
-			if (this->options & NAND_BUSWIDTH_16 &&
-					!nand_opcode_8bits(command))
-				column >>= 1;
-			ctx->write_byte(mtd, column);
-		}
-		if (page_addr != -1) {
-			ctx->write_byte(mtd, (u8)(page_addr & 0xff));
-
-			if (command == NAND_CMD_READ0 ||
-			    command == NAND_CMD_READ1 ||
-			    command == NAND_CMD_READOOB) {
-				/*
-				 * NAND controller will release -CE after
-				 * the last address byte is written, so we'll
-				 * have to forcibly assert it. No interrupts
-				 * are allowed while we do this as we don't
-				 * want the NOR flash or PCMCIA drivers to
-				 * steal our precious bytes of data...
-				 */
-				ce_override = 1;
-				local_irq_save(flags);
-				au1550_hwcontrol(mtd, NAND_CTL_SETNCE);
-			}
-
-			ctx->write_byte(mtd, (u8)(page_addr >> 8));
-
-			if (this->options & NAND_ROW_ADDR_3)
-				ctx->write_byte(mtd,
-						((page_addr >> 16) & 0x0f));
-		}
-		/* Latch in address */
-		au1550_hwcontrol(mtd, NAND_CTL_CLRALE);
-	}
-
-	/*
-	 * Program and erase have their own busy handlers.
-	 * Status and sequential in need no delay.
-	 */
-	switch (command) {
-
-	case NAND_CMD_PAGEPROG:
-	case NAND_CMD_ERASE1:
-	case NAND_CMD_ERASE2:
-	case NAND_CMD_SEQIN:
-	case NAND_CMD_STATUS:
-		return;
-
-	case NAND_CMD_RESET:
-		break;
-
-	case NAND_CMD_READ0:
-	case NAND_CMD_READ1:
-	case NAND_CMD_READOOB:
-		/* Check if we're really driving -CE low (just in case) */
-		if (unlikely(!ce_override))
-			break;
-
-		/* Apply a short delay always to ensure that we do wait tWB. */
-		ndelay(100);
-		/* Wait for a chip to become ready... */
-		for (i = this->chip_delay; !this->dev_ready(mtd) && i > 0; --i)
-			udelay(1);
-
-		/* Release -CE and re-enable interrupts. */
-		au1550_hwcontrol(mtd, NAND_CTL_CLRNCE);
-		local_irq_restore(flags);
-		return;
-	}
-	/* Apply this short delay always to ensure that we do wait tWB. */
-	ndelay(100);
-
-	while(!this->dev_ready(mtd));
-}
-
-static int find_nand_cs(unsigned long nand_base)
-{
-	void __iomem *base =
-			(void __iomem *)KSEG1ADDR(AU1000_STATIC_MEM_PHYS_ADDR);
-	unsigned long addr, staddr, start, mask, end;
-	int i;
-
-	for (i = 0; i < 4; i++) {
-		addr = 0x1000 + (i * 0x10);			/* CSx */
-		staddr = __raw_readl(base + addr + 0x08);	/* STADDRx */
-		/* figure out the decoded range of this CS */
-		start = (staddr << 4) & 0xfffc0000;
-		mask = (staddr << 18) & 0xfffc0000;
-		end = (start | (start - 1)) & ~(start ^ mask);
-		if ((nand_base >= start) && (nand_base < end))
-			return i;
-	}
-
-	return -ENODEV;
-}
-
-static int au1550nd_probe(struct platform_device *pdev)
-{
-	struct au1550nd_platdata *pd;
-	struct au1550nd_ctx *ctx;
-	struct nand_chip *this;
-	struct mtd_info *mtd;
-	struct resource *r;
-	int ret, cs;
-
-	pd = dev_get_platdata(&pdev->dev);
-	if (!pd) {
-		dev_err(&pdev->dev, "missing platform data\n");
-		return -ENODEV;
-	}
-
-	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
-	if (!ctx)
-		return -ENOMEM;
-
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!r) {
-		dev_err(&pdev->dev, "no NAND memory resource\n");
-		ret = -ENODEV;
-		goto out1;
-	}
-	if (request_mem_region(r->start, resource_size(r), "au1550-nand")) {
-		dev_err(&pdev->dev, "cannot claim NAND memory area\n");
-		ret = -ENOMEM;
-		goto out1;
-	}
-
-	ctx->base = ioremap_nocache(r->start, 0x1000);
-	if (!ctx->base) {
-		dev_err(&pdev->dev, "cannot remap NAND memory area\n");
-		ret = -ENODEV;
-		goto out2;
-	}
-
-	this = &ctx->chip;
-	mtd = nand_to_mtd(this);
-	mtd->dev.parent = &pdev->dev;
-
-	/* figure out which CS# r->start belongs to */
-	cs = find_nand_cs(r->start);
-	if (cs < 0) {
-		dev_err(&pdev->dev, "cannot detect NAND chipselect\n");
-		ret = -ENODEV;
-		goto out3;
-	}
-	ctx->cs = cs;
-
-	this->dev_ready = au1550_device_ready;
-	this->select_chip = au1550_select_chip;
-	this->cmdfunc = au1550_command;
-
-	/* 30 us command delay time */
-	this->chip_delay = 30;
-	this->ecc.mode = NAND_ECC_SOFT;
-	this->ecc.algo = NAND_ECC_HAMMING;
-
-	if (pd->devwidth)
-		this->options |= NAND_BUSWIDTH_16;
-
-	this->read_byte = (pd->devwidth) ? au_read_byte16 : au_read_byte;
-	ctx->write_byte = (pd->devwidth) ? au_write_byte16 : au_write_byte;
-	this->read_word = au_read_word;
-	this->write_buf = (pd->devwidth) ? au_write_buf16 : au_write_buf;
-	this->read_buf = (pd->devwidth) ? au_read_buf16 : au_read_buf;
-
-	ret = nand_scan(mtd, 1);
-	if (ret) {
-		dev_err(&pdev->dev, "NAND scan failed with %d\n", ret);
-		goto out3;
-	}
-
-	mtd_device_register(mtd, pd->parts, pd->num_parts);
-
-	platform_set_drvdata(pdev, ctx);
-
-	return 0;
-
-out3:
-	iounmap(ctx->base);
-out2:
-	release_mem_region(r->start, resource_size(r));
-out1:
-	kfree(ctx);
-	return ret;
-}
-
-static int au1550nd_remove(struct platform_device *pdev)
-{
-	struct au1550nd_ctx *ctx = platform_get_drvdata(pdev);
-	struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-
-	nand_release(nand_to_mtd(&ctx->chip));
-	iounmap(ctx->base);
-	release_mem_region(r->start, 0x1000);
-	kfree(ctx);
-	return 0;
-}
-
-static struct platform_driver au1550nd_driver = {
-	.driver = {
-		.name	= "au1550-nand",
-	},
-	.probe		= au1550nd_probe,
-	.remove		= au1550nd_remove,
-};
-
-module_platform_driver(au1550nd_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Embedded Edge, LLC");
-MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on Pb1550 board");