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, 871 deletions

diff --git a/drivers/mtd/nand/cafe_nand.c b/drivers/mtd/nand/cafe_nand.c
deleted file mode 100644
index 567ff972d5fc..000000000000
--- a/drivers/mtd/nand/cafe_nand.c
+++ /dev/null
@@ -1,871 +0,0 @@
-/*
- * Driver for One Laptop Per Child ‘CAFÉ’ controller, aka Marvell 88ALP01
- *
- * The data sheet for this device can be found at:
- *    http://wiki.laptop.org/go/Datasheets 
- *
- * Copyright © 2006 Red Hat, Inc.
- * Copyright © 2006 David Woodhouse <dwmw2@infradead.org>
- */
-
-#define DEBUG
-
-#include <linux/device.h>
-#undef DEBUG
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/rawnand.h>
-#include <linux/mtd/partitions.h>
-#include <linux/rslib.h>
-#include <linux/pci.h>
-#include <linux/delay.h>
-#include <linux/interrupt.h>
-#include <linux/dma-mapping.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <asm/io.h>
-
-#define CAFE_NAND_CTRL1		0x00
-#define CAFE_NAND_CTRL2		0x04
-#define CAFE_NAND_CTRL3		0x08
-#define CAFE_NAND_STATUS	0x0c
-#define CAFE_NAND_IRQ		0x10
-#define CAFE_NAND_IRQ_MASK	0x14
-#define CAFE_NAND_DATA_LEN	0x18
-#define CAFE_NAND_ADDR1		0x1c
-#define CAFE_NAND_ADDR2		0x20
-#define CAFE_NAND_TIMING1	0x24
-#define CAFE_NAND_TIMING2	0x28
-#define CAFE_NAND_TIMING3	0x2c
-#define CAFE_NAND_NONMEM	0x30
-#define CAFE_NAND_ECC_RESULT	0x3C
-#define CAFE_NAND_DMA_CTRL	0x40
-#define CAFE_NAND_DMA_ADDR0	0x44
-#define CAFE_NAND_DMA_ADDR1	0x48
-#define CAFE_NAND_ECC_SYN01	0x50
-#define CAFE_NAND_ECC_SYN23	0x54
-#define CAFE_NAND_ECC_SYN45	0x58
-#define CAFE_NAND_ECC_SYN67	0x5c
-#define CAFE_NAND_READ_DATA	0x1000
-#define CAFE_NAND_WRITE_DATA	0x2000
-
-#define CAFE_GLOBAL_CTRL	0x3004
-#define CAFE_GLOBAL_IRQ		0x3008
-#define CAFE_GLOBAL_IRQ_MASK	0x300c
-#define CAFE_NAND_RESET		0x3034
-
-/* Missing from the datasheet: bit 19 of CTRL1 sets CE0 vs. CE1 */
-#define CTRL1_CHIPSELECT	(1<<19)
-
-struct cafe_priv {
-	struct nand_chip nand;
-	struct pci_dev *pdev;
-	void __iomem *mmio;
-	struct rs_control *rs;
-	uint32_t ctl1;
-	uint32_t ctl2;
-	int datalen;
-	int nr_data;
-	int data_pos;
-	int page_addr;
-	dma_addr_t dmaaddr;
-	unsigned char *dmabuf;
-};
-
-static int usedma = 1;
-module_param(usedma, int, 0644);
-
-static int skipbbt = 0;
-module_param(skipbbt, int, 0644);
-
-static int debug = 0;
-module_param(debug, int, 0644);
-
-static int regdebug = 0;
-module_param(regdebug, int, 0644);
-
-static int checkecc = 1;
-module_param(checkecc, int, 0644);
-
-static unsigned int numtimings;
-static int timing[3];
-module_param_array(timing, int, &numtimings, 0644);
-
-static const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL };
-
-/* Hrm. Why isn't this already conditional on something in the struct device? */
-#define cafe_dev_dbg(dev, args...) do { if (debug) dev_dbg(dev, ##args); } while(0)
-
-/* Make it easier to switch to PIO if we need to */
-#define cafe_readl(cafe, addr)			readl((cafe)->mmio + CAFE_##addr)
-#define cafe_writel(cafe, datum, addr)		writel(datum, (cafe)->mmio + CAFE_##addr)
-
-static int cafe_device_ready(struct mtd_info *mtd)
-{
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	struct cafe_priv *cafe = nand_get_controller_data(chip);
-	int result = !!(cafe_readl(cafe, NAND_STATUS) & 0x40000000);
-	uint32_t irqs = cafe_readl(cafe, NAND_IRQ);
-
-	cafe_writel(cafe, irqs, NAND_IRQ);
-
-	cafe_dev_dbg(&cafe->pdev->dev, "NAND device is%s ready, IRQ %x (%x) (%x,%x)\n",
-		result?"":" not", irqs, cafe_readl(cafe, NAND_IRQ),
-		cafe_readl(cafe, GLOBAL_IRQ), cafe_readl(cafe, GLOBAL_IRQ_MASK));
-
-	return result;
-}
-
-
-static void cafe_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
-{
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	struct cafe_priv *cafe = nand_get_controller_data(chip);
-
-	if (usedma)
-		memcpy(cafe->dmabuf + cafe->datalen, buf, len);
-	else
-		memcpy_toio(cafe->mmio + CAFE_NAND_WRITE_DATA + cafe->datalen, buf, len);
-
-	cafe->datalen += len;
-
-	cafe_dev_dbg(&cafe->pdev->dev, "Copy 0x%x bytes to write buffer. datalen 0x%x\n",
-		len, cafe->datalen);
-}
-
-static void cafe_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
-{
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	struct cafe_priv *cafe = nand_get_controller_data(chip);
-
-	if (usedma)
-		memcpy(buf, cafe->dmabuf + cafe->datalen, len);
-	else
-		memcpy_fromio(buf, cafe->mmio + CAFE_NAND_READ_DATA + cafe->datalen, len);
-
-	cafe_dev_dbg(&cafe->pdev->dev, "Copy 0x%x bytes from position 0x%x in read buffer.\n",
-		  len, cafe->datalen);
-	cafe->datalen += len;
-}
-
-static uint8_t cafe_read_byte(struct mtd_info *mtd)
-{
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	struct cafe_priv *cafe = nand_get_controller_data(chip);
-	uint8_t d;
-
-	cafe_read_buf(mtd, &d, 1);
-	cafe_dev_dbg(&cafe->pdev->dev, "Read %02x\n", d);
-
-	return d;
-}
-
-static void cafe_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
-			      int column, int page_addr)
-{
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	struct cafe_priv *cafe = nand_get_controller_data(chip);
-	int adrbytes = 0;
-	uint32_t ctl1;
-	uint32_t doneint = 0x80000000;
-
-	cafe_dev_dbg(&cafe->pdev->dev, "cmdfunc %02x, 0x%x, 0x%x\n",
-		command, column, page_addr);
-
-	if (command == NAND_CMD_ERASE2 || command == NAND_CMD_PAGEPROG) {
-		/* Second half of a command we already calculated */
-		cafe_writel(cafe, cafe->ctl2 | 0x100 | command, NAND_CTRL2);
-		ctl1 = cafe->ctl1;
-		cafe->ctl2 &= ~(1<<30);
-		cafe_dev_dbg(&cafe->pdev->dev, "Continue command, ctl1 %08x, #data %d\n",
-			  cafe->ctl1, cafe->nr_data);
-		goto do_command;
-	}
-	/* Reset ECC engine */
-	cafe_writel(cafe, 0, NAND_CTRL2);
-
-	/* Emulate NAND_CMD_READOOB on large-page chips */
-	if (mtd->writesize > 512 &&
-	    command == NAND_CMD_READOOB) {
-		column += mtd->writesize;
-		command = NAND_CMD_READ0;
-	}
-
-	/* FIXME: Do we need to send read command before sending data
-	   for small-page chips, to position the buffer correctly? */
-
-	if (column != -1) {
-		cafe_writel(cafe, column, NAND_ADDR1);
-		adrbytes = 2;
-		if (page_addr != -1)
-			goto write_adr2;
-	} else if (page_addr != -1) {
-		cafe_writel(cafe, page_addr & 0xffff, NAND_ADDR1);
-		page_addr >>= 16;
-	write_adr2:
-		cafe_writel(cafe, page_addr, NAND_ADDR2);
-		adrbytes += 2;
-		if (mtd->size > mtd->writesize << 16)
-			adrbytes++;
-	}
-
-	cafe->data_pos = cafe->datalen = 0;
-
-	/* Set command valid bit, mask in the chip select bit  */
-	ctl1 = 0x80000000 | command | (cafe->ctl1 & CTRL1_CHIPSELECT);
-
-	/* Set RD or WR bits as appropriate */
-	if (command == NAND_CMD_READID || command == NAND_CMD_STATUS) {
-		ctl1 |= (1<<26); /* rd */
-		/* Always 5 bytes, for now */
-		cafe->datalen = 4;
-		/* And one address cycle -- even for STATUS, since the controller doesn't work without */
-		adrbytes = 1;
-	} else if (command == NAND_CMD_READ0 || command == NAND_CMD_READ1 ||
-		   command == NAND_CMD_READOOB || command == NAND_CMD_RNDOUT) {
-		ctl1 |= 1<<26; /* rd */
-		/* For now, assume just read to end of page */
-		cafe->datalen = mtd->writesize + mtd->oobsize - column;
-	} else if (command == NAND_CMD_SEQIN)
-		ctl1 |= 1<<25; /* wr */
-
-	/* Set number of address bytes */
-	if (adrbytes)
-		ctl1 |= ((adrbytes-1)|8) << 27;
-
-	if (command == NAND_CMD_SEQIN || command == NAND_CMD_ERASE1) {
-		/* Ignore the first command of a pair; the hardware
-		   deals with them both at once, later */
-		cafe->ctl1 = ctl1;
-		cafe_dev_dbg(&cafe->pdev->dev, "Setup for delayed command, ctl1 %08x, dlen %x\n",
-			  cafe->ctl1, cafe->datalen);
-		return;
-	}
-	/* RNDOUT and READ0 commands need a following byte */
-	if (command == NAND_CMD_RNDOUT)
-		cafe_writel(cafe, cafe->ctl2 | 0x100 | NAND_CMD_RNDOUTSTART, NAND_CTRL2);
-	else if (command == NAND_CMD_READ0 && mtd->writesize > 512)
-		cafe_writel(cafe, cafe->ctl2 | 0x100 | NAND_CMD_READSTART, NAND_CTRL2);
-
- do_command:
-	cafe_dev_dbg(&cafe->pdev->dev, "dlen %x, ctl1 %x, ctl2 %x\n",
-		cafe->datalen, ctl1, cafe_readl(cafe, NAND_CTRL2));
-
-	/* NB: The datasheet lies -- we really should be subtracting 1 here */
-	cafe_writel(cafe, cafe->datalen, NAND_DATA_LEN);
-	cafe_writel(cafe, 0x90000000, NAND_IRQ);
-	if (usedma && (ctl1 & (3<<25))) {
-		uint32_t dmactl = 0xc0000000 + cafe->datalen;
-		/* If WR or RD bits set, set up DMA */
-		if (ctl1 & (1<<26)) {
-			/* It's a read */
-			dmactl |= (1<<29);
-			/* ... so it's done when the DMA is done, not just
-			   the command. */
-			doneint = 0x10000000;
-		}
-		cafe_writel(cafe, dmactl, NAND_DMA_CTRL);
-	}
-	cafe->datalen = 0;
-
-	if (unlikely(regdebug)) {
-		int i;
-		printk("About to write command %08x to register 0\n", ctl1);
-		for (i=4; i< 0x5c; i+=4)
-			printk("Register %x: %08x\n", i, readl(cafe->mmio + i));
-	}
-
-	cafe_writel(cafe, ctl1, NAND_CTRL1);
-	/* Apply this short delay always to ensure that we do wait tWB in
-	 * any case on any machine. */
-	ndelay(100);
-
-	if (1) {
-		int c;
-		uint32_t irqs;
-
-		for (c = 500000; c != 0; c--) {
-			irqs = cafe_readl(cafe, NAND_IRQ);
-			if (irqs & doneint)
-				break;
-			udelay(1);
-			if (!(c % 100000))
-				cafe_dev_dbg(&cafe->pdev->dev, "Wait for ready, IRQ %x\n", irqs);
-			cpu_relax();
-		}
-		cafe_writel(cafe, doneint, NAND_IRQ);
-		cafe_dev_dbg(&cafe->pdev->dev, "Command %x completed after %d usec, irqs %x (%x)\n",
-			     command, 500000-c, irqs, cafe_readl(cafe, NAND_IRQ));
-	}
-
-	WARN_ON(cafe->ctl2 & (1<<30));
-
-	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:
-	case NAND_CMD_RNDOUT:
-		cafe_writel(cafe, cafe->ctl2, NAND_CTRL2);
-		return;
-	}
-	nand_wait_ready(mtd);
-	cafe_writel(cafe, cafe->ctl2, NAND_CTRL2);
-}
-
-static void cafe_select_chip(struct mtd_info *mtd, int chipnr)
-{
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	struct cafe_priv *cafe = nand_get_controller_data(chip);
-
-	cafe_dev_dbg(&cafe->pdev->dev, "select_chip %d\n", chipnr);
-
-	/* Mask the appropriate bit into the stored value of ctl1
-	   which will be used by cafe_nand_cmdfunc() */
-	if (chipnr)
-		cafe->ctl1 |= CTRL1_CHIPSELECT;
-	else
-		cafe->ctl1 &= ~CTRL1_CHIPSELECT;
-}
-
-static irqreturn_t cafe_nand_interrupt(int irq, void *id)
-{
-	struct mtd_info *mtd = id;
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	struct cafe_priv *cafe = nand_get_controller_data(chip);
-	uint32_t irqs = cafe_readl(cafe, NAND_IRQ);
-	cafe_writel(cafe, irqs & ~0x90000000, NAND_IRQ);
-	if (!irqs)
-		return IRQ_NONE;
-
-	cafe_dev_dbg(&cafe->pdev->dev, "irq, bits %x (%x)\n", irqs, cafe_readl(cafe, NAND_IRQ));
-	return IRQ_HANDLED;
-}
-
-static void cafe_nand_bug(struct mtd_info *mtd)
-{
-	BUG();
-}
-
-static int cafe_nand_write_oob(struct mtd_info *mtd,
-			       struct nand_chip *chip, int page)
-{
-	return nand_prog_page_op(chip, page, mtd->writesize, chip->oob_poi,
-				 mtd->oobsize);
-}
-
-/* Don't use -- use nand_read_oob_std for now */
-static int cafe_nand_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
-			      int page)
-{
-	return nand_read_oob_op(chip, page, 0, chip->oob_poi, mtd->oobsize);
-}
-/**
- * cafe_nand_read_page_syndrome - [REPLACEABLE] hardware ecc syndrome based page read
- * @mtd:	mtd info structure
- * @chip:	nand chip info structure
- * @buf:	buffer to store read data
- * @oob_required:	caller expects OOB data read to chip->oob_poi
- *
- * The hw generator calculates the error syndrome automatically. Therefore
- * we need a special oob layout and handling.
- */
-static int cafe_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
-			       uint8_t *buf, int oob_required, int page)
-{
-	struct cafe_priv *cafe = nand_get_controller_data(chip);
-	unsigned int max_bitflips = 0;
-
-	cafe_dev_dbg(&cafe->pdev->dev, "ECC result %08x SYN1,2 %08x\n",
-		     cafe_readl(cafe, NAND_ECC_RESULT),
-		     cafe_readl(cafe, NAND_ECC_SYN01));
-
-	nand_read_page_op(chip, page, 0, buf, mtd->writesize);
-	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
-
-	if (checkecc && cafe_readl(cafe, NAND_ECC_RESULT) & (1<<18)) {
-		unsigned short syn[8], pat[4];
-		int pos[4];
-		u8 *oob = chip->oob_poi;
-		int i, n;
-
-		for (i=0; i<8; i+=2) {
-			uint32_t tmp = cafe_readl(cafe, NAND_ECC_SYN01 + (i*2));
-			syn[i] = cafe->rs->index_of[tmp & 0xfff];
-			syn[i+1] = cafe->rs->index_of[(tmp >> 16) & 0xfff];
-		}
-
-		n = decode_rs16(cafe->rs, NULL, NULL, 1367, syn, 0, pos, 0,
-		                pat);
-
-		for (i = 0; i < n; i++) {
-			int p = pos[i];
-
-			/* The 12-bit symbols are mapped to bytes here */
-
-			if (p > 1374) {
-				/* out of range */
-				n = -1374;
-			} else if (p == 0) {
-				/* high four bits do not correspond to data */
-				if (pat[i] > 0xff)
-					n = -2048;
-				else
-					buf[0] ^= pat[i];
-			} else if (p == 1365) {
-				buf[2047] ^= pat[i] >> 4;
-				oob[0] ^= pat[i] << 4;
-			} else if (p > 1365) {
-				if ((p & 1) == 1) {
-					oob[3*p/2 - 2048] ^= pat[i] >> 4;
-					oob[3*p/2 - 2047] ^= pat[i] << 4;
-				} else {
-					oob[3*p/2 - 2049] ^= pat[i] >> 8;
-					oob[3*p/2 - 2048] ^= pat[i];
-				}
-			} else if ((p & 1) == 1) {
-				buf[3*p/2] ^= pat[i] >> 4;
-				buf[3*p/2 + 1] ^= pat[i] << 4;
-			} else {
-				buf[3*p/2 - 1] ^= pat[i] >> 8;
-				buf[3*p/2] ^= pat[i];
-			}
-		}
-
-		if (n < 0) {
-			dev_dbg(&cafe->pdev->dev, "Failed to correct ECC at %08x\n",
-				cafe_readl(cafe, NAND_ADDR2) * 2048);
-			for (i = 0; i < 0x5c; i += 4)
-				printk("Register %x: %08x\n", i, readl(cafe->mmio + i));
-			mtd->ecc_stats.failed++;
-		} else {
-			dev_dbg(&cafe->pdev->dev, "Corrected %d symbol errors\n", n);
-			mtd->ecc_stats.corrected += n;
-			max_bitflips = max_t(unsigned int, max_bitflips, n);
-		}
-	}
-
-	return max_bitflips;
-}
-
-static int cafe_ooblayout_ecc(struct mtd_info *mtd, int section,
-			      struct mtd_oob_region *oobregion)
-{
-	struct nand_chip *chip = mtd_to_nand(mtd);
-
-	if (section)
-		return -ERANGE;
-
-	oobregion->offset = 0;
-	oobregion->length = chip->ecc.total;
-
-	return 0;
-}
-
-static int cafe_ooblayout_free(struct mtd_info *mtd, int section,
-			       struct mtd_oob_region *oobregion)
-{
-	struct nand_chip *chip = mtd_to_nand(mtd);
-
-	if (section)
-		return -ERANGE;
-
-	oobregion->offset = chip->ecc.total;
-	oobregion->length = mtd->oobsize - chip->ecc.total;
-
-	return 0;
-}
-
-static const struct mtd_ooblayout_ops cafe_ooblayout_ops = {
-	.ecc = cafe_ooblayout_ecc,
-	.free = cafe_ooblayout_free,
-};
-
-/* Ick. The BBT code really ought to be able to work this bit out
-   for itself from the above, at least for the 2KiB case */
-static uint8_t cafe_bbt_pattern_2048[] = { 'B', 'b', 't', '0' };
-static uint8_t cafe_mirror_pattern_2048[] = { '1', 't', 'b', 'B' };
-
-static uint8_t cafe_bbt_pattern_512[] = { 0xBB };
-static uint8_t cafe_mirror_pattern_512[] = { 0xBC };
-
-
-static struct nand_bbt_descr cafe_bbt_main_descr_2048 = {
-	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
-		| NAND_BBT_2BIT | NAND_BBT_VERSION,
-	.offs =	14,
-	.len = 4,
-	.veroffs = 18,
-	.maxblocks = 4,
-	.pattern = cafe_bbt_pattern_2048
-};
-
-static struct nand_bbt_descr cafe_bbt_mirror_descr_2048 = {
-	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
-		| NAND_BBT_2BIT | NAND_BBT_VERSION,
-	.offs =	14,
-	.len = 4,
-	.veroffs = 18,
-	.maxblocks = 4,
-	.pattern = cafe_mirror_pattern_2048
-};
-
-static struct nand_bbt_descr cafe_bbt_main_descr_512 = {
-	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
-		| NAND_BBT_2BIT | NAND_BBT_VERSION,
-	.offs =	14,
-	.len = 1,
-	.veroffs = 15,
-	.maxblocks = 4,
-	.pattern = cafe_bbt_pattern_512
-};
-
-static struct nand_bbt_descr cafe_bbt_mirror_descr_512 = {
-	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
-		| NAND_BBT_2BIT | NAND_BBT_VERSION,
-	.offs =	14,
-	.len = 1,
-	.veroffs = 15,
-	.maxblocks = 4,
-	.pattern = cafe_mirror_pattern_512
-};
-
-
-static int cafe_nand_write_page_lowlevel(struct mtd_info *mtd,
-					  struct nand_chip *chip,
-					  const uint8_t *buf, int oob_required,
-					  int page)
-{
-	struct cafe_priv *cafe = nand_get_controller_data(chip);
-
-	nand_prog_page_begin_op(chip, page, 0, buf, mtd->writesize);
-	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
-
-	/* Set up ECC autogeneration */
-	cafe->ctl2 |= (1<<30);
-
-	return nand_prog_page_end_op(chip);
-}
-
-static int cafe_nand_block_bad(struct mtd_info *mtd, loff_t ofs)
-{
-	return 0;
-}
-
-/* F_2[X]/(X**6+X+1)  */
-static unsigned short gf64_mul(u8 a, u8 b)
-{
-	u8 c;
-	unsigned int i;
-
-	c = 0;
-	for (i = 0; i < 6; i++) {
-		if (a & 1)
-			c ^= b;
-		a >>= 1;
-		b <<= 1;
-		if ((b & 0x40) != 0)
-			b ^= 0x43;
-	}
-
-	return c;
-}
-
-/* F_64[X]/(X**2+X+A**-1) with A the generator of F_64[X]  */
-static u16 gf4096_mul(u16 a, u16 b)
-{
-	u8 ah, al, bh, bl, ch, cl;
-
-	ah = a >> 6;
-	al = a & 0x3f;
-	bh = b >> 6;
-	bl = b & 0x3f;
-
-	ch = gf64_mul(ah ^ al, bh ^ bl) ^ gf64_mul(al, bl);
-	cl = gf64_mul(gf64_mul(ah, bh), 0x21) ^ gf64_mul(al, bl);
-
-	return (ch << 6) ^ cl;
-}
-
-static int cafe_mul(int x)
-{
-	if (x == 0)
-		return 1;
-	return gf4096_mul(x, 0xe01);
-}
-
-static int cafe_nand_probe(struct pci_dev *pdev,
-				     const struct pci_device_id *ent)
-{
-	struct mtd_info *mtd;
-	struct cafe_priv *cafe;
-	uint32_t ctrl;
-	int err = 0;
-	int old_dma;
-
-	/* Very old versions shared the same PCI ident for all three
-	   functions on the chip. Verify the class too... */
-	if ((pdev->class >> 8) != PCI_CLASS_MEMORY_FLASH)
-		return -ENODEV;
-
-	err = pci_enable_device(pdev);
-	if (err)
-		return err;
-
-	pci_set_master(pdev);
-
-	cafe = kzalloc(sizeof(*cafe), GFP_KERNEL);
-	if (!cafe)
-		return  -ENOMEM;
-
-	mtd = nand_to_mtd(&cafe->nand);
-	mtd->dev.parent = &pdev->dev;
-	nand_set_controller_data(&cafe->nand, cafe);
-
-	cafe->pdev = pdev;
-	cafe->mmio = pci_iomap(pdev, 0, 0);
-	if (!cafe->mmio) {
-		dev_warn(&pdev->dev, "failed to iomap\n");
-		err = -ENOMEM;
-		goto out_free_mtd;
-	}
-
-	cafe->rs = init_rs_non_canonical(12, &cafe_mul, 0, 1, 8);
-	if (!cafe->rs) {
-		err = -ENOMEM;
-		goto out_ior;
-	}
-
-	cafe->nand.cmdfunc = cafe_nand_cmdfunc;
-	cafe->nand.dev_ready = cafe_device_ready;
-	cafe->nand.read_byte = cafe_read_byte;
-	cafe->nand.read_buf = cafe_read_buf;
-	cafe->nand.write_buf = cafe_write_buf;
-	cafe->nand.select_chip = cafe_select_chip;
-	cafe->nand.onfi_set_features = nand_onfi_get_set_features_notsupp;
-	cafe->nand.onfi_get_features = nand_onfi_get_set_features_notsupp;
-
-	cafe->nand.chip_delay = 0;
-
-	/* Enable the following for a flash based bad block table */
-	cafe->nand.bbt_options = NAND_BBT_USE_FLASH;
-
-	if (skipbbt) {
-		cafe->nand.options |= NAND_SKIP_BBTSCAN;
-		cafe->nand.block_bad = cafe_nand_block_bad;
-	}
-
-	if (numtimings && numtimings != 3) {
-		dev_warn(&cafe->pdev->dev, "%d timing register values ignored; precisely three are required\n", numtimings);
-	}
-
-	if (numtimings == 3) {
-		cafe_dev_dbg(&cafe->pdev->dev, "Using provided timings (%08x %08x %08x)\n",
-			     timing[0], timing[1], timing[2]);
-	} else {
-		timing[0] = cafe_readl(cafe, NAND_TIMING1);
-		timing[1] = cafe_readl(cafe, NAND_TIMING2);
-		timing[2] = cafe_readl(cafe, NAND_TIMING3);
-
-		if (timing[0] | timing[1] | timing[2]) {
-			cafe_dev_dbg(&cafe->pdev->dev, "Timing registers already set (%08x %08x %08x)\n",
-				     timing[0], timing[1], timing[2]);
-		} else {
-			dev_warn(&cafe->pdev->dev, "Timing registers unset; using most conservative defaults\n");
-			timing[0] = timing[1] = timing[2] = 0xffffffff;
-		}
-	}
-
-	/* Start off by resetting the NAND controller completely */
-	cafe_writel(cafe, 1, NAND_RESET);
-	cafe_writel(cafe, 0, NAND_RESET);
-
-	cafe_writel(cafe, timing[0], NAND_TIMING1);
-	cafe_writel(cafe, timing[1], NAND_TIMING2);
-	cafe_writel(cafe, timing[2], NAND_TIMING3);
-
-	cafe_writel(cafe, 0xffffffff, NAND_IRQ_MASK);
-	err = request_irq(pdev->irq, &cafe_nand_interrupt, IRQF_SHARED,
-			  "CAFE NAND", mtd);
-	if (err) {
-		dev_warn(&pdev->dev, "Could not register IRQ %d\n", pdev->irq);
-		goto out_ior;
-	}
-
-	/* Disable master reset, enable NAND clock */
-	ctrl = cafe_readl(cafe, GLOBAL_CTRL);
-	ctrl &= 0xffffeff0;
-	ctrl |= 0x00007000;
-	cafe_writel(cafe, ctrl | 0x05, GLOBAL_CTRL);
-	cafe_writel(cafe, ctrl | 0x0a, GLOBAL_CTRL);
-	cafe_writel(cafe, 0, NAND_DMA_CTRL);
-
-	cafe_writel(cafe, 0x7006, GLOBAL_CTRL);
-	cafe_writel(cafe, 0x700a, GLOBAL_CTRL);
-
-	/* Enable NAND IRQ in global IRQ mask register */
-	cafe_writel(cafe, 0x80000007, GLOBAL_IRQ_MASK);
-	cafe_dev_dbg(&cafe->pdev->dev, "Control %x, IRQ mask %x\n",
-		cafe_readl(cafe, GLOBAL_CTRL),
-		cafe_readl(cafe, GLOBAL_IRQ_MASK));
-
-	/* Do not use the DMA for the nand_scan_ident() */
-	old_dma = usedma;
-	usedma = 0;
-
-	/* Scan to find existence of the device */
-	err = nand_scan_ident(mtd, 2, NULL);
-	if (err)
-		goto out_irq;
-
-	cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev, 2112,
-					  &cafe->dmaaddr, GFP_KERNEL);
-	if (!cafe->dmabuf) {
-		err = -ENOMEM;
-		goto out_irq;
-	}
-
-	/* Set up DMA address */
-	cafe_writel(cafe, lower_32_bits(cafe->dmaaddr), NAND_DMA_ADDR0);
-	cafe_writel(cafe, upper_32_bits(cafe->dmaaddr), NAND_DMA_ADDR1);
-
-	cafe_dev_dbg(&cafe->pdev->dev, "Set DMA address to %x (virt %p)\n",
-		cafe_readl(cafe, NAND_DMA_ADDR0), cafe->dmabuf);
-
-	/* Restore the DMA flag */
-	usedma = old_dma;
-
-	cafe->ctl2 = 1<<27; /* Reed-Solomon ECC */
-	if (mtd->writesize == 2048)
-		cafe->ctl2 |= 1<<29; /* 2KiB page size */
-
-	/* Set up ECC according to the type of chip we found */
-	mtd_set_ooblayout(mtd, &cafe_ooblayout_ops);
-	if (mtd->writesize == 2048) {
-		cafe->nand.bbt_td = &cafe_bbt_main_descr_2048;
-		cafe->nand.bbt_md = &cafe_bbt_mirror_descr_2048;
-	} else if (mtd->writesize == 512) {
-		cafe->nand.bbt_td = &cafe_bbt_main_descr_512;
-		cafe->nand.bbt_md = &cafe_bbt_mirror_descr_512;
-	} else {
-		printk(KERN_WARNING "Unexpected NAND flash writesize %d. Aborting\n",
-		       mtd->writesize);
-		goto out_free_dma;
-	}
-	cafe->nand.ecc.mode = NAND_ECC_HW_SYNDROME;
-	cafe->nand.ecc.size = mtd->writesize;
-	cafe->nand.ecc.bytes = 14;
-	cafe->nand.ecc.strength = 4;
-	cafe->nand.ecc.hwctl  = (void *)cafe_nand_bug;
-	cafe->nand.ecc.calculate = (void *)cafe_nand_bug;
-	cafe->nand.ecc.correct  = (void *)cafe_nand_bug;
-	cafe->nand.ecc.write_page = cafe_nand_write_page_lowlevel;
-	cafe->nand.ecc.write_oob = cafe_nand_write_oob;
-	cafe->nand.ecc.read_page = cafe_nand_read_page;
-	cafe->nand.ecc.read_oob = cafe_nand_read_oob;
-
-	err = nand_scan_tail(mtd);
-	if (err)
-		goto out_free_dma;
-
-	pci_set_drvdata(pdev, mtd);
-
-	mtd->name = "cafe_nand";
-	mtd_device_parse_register(mtd, part_probes, NULL, NULL, 0);
-
-	goto out;
-
- out_free_dma:
-	dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
- out_irq:
-	/* Disable NAND IRQ in global IRQ mask register */
-	cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
-	free_irq(pdev->irq, mtd);
- out_ior:
-	pci_iounmap(pdev, cafe->mmio);
- out_free_mtd:
-	kfree(cafe);
- out:
-	return err;
-}
-
-static void cafe_nand_remove(struct pci_dev *pdev)
-{
-	struct mtd_info *mtd = pci_get_drvdata(pdev);
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	struct cafe_priv *cafe = nand_get_controller_data(chip);
-
-	/* Disable NAND IRQ in global IRQ mask register */
-	cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK);
-	free_irq(pdev->irq, mtd);
-	nand_release(mtd);
-	free_rs(cafe->rs);
-	pci_iounmap(pdev, cafe->mmio);
-	dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr);
-	kfree(cafe);
-}
-
-static const struct pci_device_id cafe_nand_tbl[] = {
-	{ PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_88ALP01_NAND,
-	  PCI_ANY_ID, PCI_ANY_ID },
-	{ }
-};
-
-MODULE_DEVICE_TABLE(pci, cafe_nand_tbl);
-
-static int cafe_nand_resume(struct pci_dev *pdev)
-{
-	uint32_t ctrl;
-	struct mtd_info *mtd = pci_get_drvdata(pdev);
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	struct cafe_priv *cafe = nand_get_controller_data(chip);
-
-       /* Start off by resetting the NAND controller completely */
-	cafe_writel(cafe, 1, NAND_RESET);
-	cafe_writel(cafe, 0, NAND_RESET);
-	cafe_writel(cafe, 0xffffffff, NAND_IRQ_MASK);
-
-	/* Restore timing configuration */
-	cafe_writel(cafe, timing[0], NAND_TIMING1);
-	cafe_writel(cafe, timing[1], NAND_TIMING2);
-	cafe_writel(cafe, timing[2], NAND_TIMING3);
-
-        /* Disable master reset, enable NAND clock */
-	ctrl = cafe_readl(cafe, GLOBAL_CTRL);
-	ctrl &= 0xffffeff0;
-	ctrl |= 0x00007000;
-	cafe_writel(cafe, ctrl | 0x05, GLOBAL_CTRL);
-	cafe_writel(cafe, ctrl | 0x0a, GLOBAL_CTRL);
-	cafe_writel(cafe, 0, NAND_DMA_CTRL);
-	cafe_writel(cafe, 0x7006, GLOBAL_CTRL);
-	cafe_writel(cafe, 0x700a, GLOBAL_CTRL);
-
-	/* Set up DMA address */
-	cafe_writel(cafe, cafe->dmaaddr & 0xffffffff, NAND_DMA_ADDR0);
-	if (sizeof(cafe->dmaaddr) > 4)
-	/* Shift in two parts to shut the compiler up */
-		cafe_writel(cafe, (cafe->dmaaddr >> 16) >> 16, NAND_DMA_ADDR1);
-	else
-		cafe_writel(cafe, 0, NAND_DMA_ADDR1);
-
-	/* Enable NAND IRQ in global IRQ mask register */
-	cafe_writel(cafe, 0x80000007, GLOBAL_IRQ_MASK);
-	return 0;
-}
-
-static struct pci_driver cafe_nand_pci_driver = {
-	.name = "CAFÉ NAND",
-	.id_table = cafe_nand_tbl,
-	.probe = cafe_nand_probe,
-	.remove = cafe_nand_remove,
-	.resume = cafe_nand_resume,
-};
-
-module_pci_driver(cafe_nand_pci_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
-MODULE_DESCRIPTION("NAND flash driver for OLPC CAFÉ chip");