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, 1079 deletions

diff --git a/drivers/mtd/nand/r852.c b/drivers/mtd/nand/r852.c
deleted file mode 100644
index 595635b9e9de..000000000000
--- a/drivers/mtd/nand/r852.c
+++ /dev/null
@@ -1,1079 +0,0 @@
-/*
- * Copyright © 2009 - Maxim Levitsky
- * driver for Ricoh xD readers
- *
- * 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/kernel.h>
-#include <linux/module.h>
-#include <linux/jiffies.h>
-#include <linux/workqueue.h>
-#include <linux/interrupt.h>
-#include <linux/pci.h>
-#include <linux/pci_ids.h>
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <asm/byteorder.h>
-#include <linux/sched.h>
-#include "sm_common.h"
-#include "r852.h"
-
-
-static bool r852_enable_dma = 1;
-module_param(r852_enable_dma, bool, S_IRUGO);
-MODULE_PARM_DESC(r852_enable_dma, "Enable usage of the DMA (default)");
-
-static int debug;
-module_param(debug, int, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(debug, "Debug level (0-2)");
-
-/* read register */
-static inline uint8_t r852_read_reg(struct r852_device *dev, int address)
-{
-	uint8_t reg = readb(dev->mmio + address);
-	return reg;
-}
-
-/* write register */
-static inline void r852_write_reg(struct r852_device *dev,
-						int address, uint8_t value)
-{
-	writeb(value, dev->mmio + address);
-	mmiowb();
-}
-
-
-/* read dword sized register */
-static inline uint32_t r852_read_reg_dword(struct r852_device *dev, int address)
-{
-	uint32_t reg = le32_to_cpu(readl(dev->mmio + address));
-	return reg;
-}
-
-/* write dword sized register */
-static inline void r852_write_reg_dword(struct r852_device *dev,
-							int address, uint32_t value)
-{
-	writel(cpu_to_le32(value), dev->mmio + address);
-	mmiowb();
-}
-
-/* returns pointer to our private structure */
-static inline struct r852_device *r852_get_dev(struct mtd_info *mtd)
-{
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	return nand_get_controller_data(chip);
-}
-
-
-/* check if controller supports dma */
-static void r852_dma_test(struct r852_device *dev)
-{
-	dev->dma_usable = (r852_read_reg(dev, R852_DMA_CAP) &
-		(R852_DMA1 | R852_DMA2)) == (R852_DMA1 | R852_DMA2);
-
-	if (!dev->dma_usable)
-		message("Non dma capable device detected, dma disabled");
-
-	if (!r852_enable_dma) {
-		message("disabling dma on user request");
-		dev->dma_usable = 0;
-	}
-}
-
-/*
- * Enable dma. Enables ether first or second stage of the DMA,
- * Expects dev->dma_dir and dev->dma_state be set
- */
-static void r852_dma_enable(struct r852_device *dev)
-{
-	uint8_t dma_reg, dma_irq_reg;
-
-	/* Set up dma settings */
-	dma_reg = r852_read_reg_dword(dev, R852_DMA_SETTINGS);
-	dma_reg &= ~(R852_DMA_READ | R852_DMA_INTERNAL | R852_DMA_MEMORY);
-
-	if (dev->dma_dir)
-		dma_reg |= R852_DMA_READ;
-
-	if (dev->dma_state == DMA_INTERNAL) {
-		dma_reg |= R852_DMA_INTERNAL;
-		/* Precaution to make sure HW doesn't write */
-			/* to random kernel memory */
-		r852_write_reg_dword(dev, R852_DMA_ADDR,
-			cpu_to_le32(dev->phys_bounce_buffer));
-	} else {
-		dma_reg |= R852_DMA_MEMORY;
-		r852_write_reg_dword(dev, R852_DMA_ADDR,
-			cpu_to_le32(dev->phys_dma_addr));
-	}
-
-	/* Precaution: make sure write reached the device */
-	r852_read_reg_dword(dev, R852_DMA_ADDR);
-
-	r852_write_reg_dword(dev, R852_DMA_SETTINGS, dma_reg);
-
-	/* Set dma irq */
-	dma_irq_reg = r852_read_reg_dword(dev, R852_DMA_IRQ_ENABLE);
-	r852_write_reg_dword(dev, R852_DMA_IRQ_ENABLE,
-		dma_irq_reg |
-		R852_DMA_IRQ_INTERNAL |
-		R852_DMA_IRQ_ERROR |
-		R852_DMA_IRQ_MEMORY);
-}
-
-/*
- * Disable dma, called from the interrupt handler, which specifies
- * success of the operation via 'error' argument
- */
-static void r852_dma_done(struct r852_device *dev, int error)
-{
-	WARN_ON(dev->dma_stage == 0);
-
-	r852_write_reg_dword(dev, R852_DMA_IRQ_STA,
-			r852_read_reg_dword(dev, R852_DMA_IRQ_STA));
-
-	r852_write_reg_dword(dev, R852_DMA_SETTINGS, 0);
-	r852_write_reg_dword(dev, R852_DMA_IRQ_ENABLE, 0);
-
-	/* Precaution to make sure HW doesn't write to random kernel memory */
-	r852_write_reg_dword(dev, R852_DMA_ADDR,
-		cpu_to_le32(dev->phys_bounce_buffer));
-	r852_read_reg_dword(dev, R852_DMA_ADDR);
-
-	dev->dma_error = error;
-	dev->dma_stage = 0;
-
-	if (dev->phys_dma_addr && dev->phys_dma_addr != dev->phys_bounce_buffer)
-		pci_unmap_single(dev->pci_dev, dev->phys_dma_addr, R852_DMA_LEN,
-			dev->dma_dir ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE);
-}
-
-/*
- * Wait, till dma is done, which includes both phases of it
- */
-static int r852_dma_wait(struct r852_device *dev)
-{
-	long timeout = wait_for_completion_timeout(&dev->dma_done,
-				msecs_to_jiffies(1000));
-	if (!timeout) {
-		dbg("timeout waiting for DMA interrupt");
-		return -ETIMEDOUT;
-	}
-
-	return 0;
-}
-
-/*
- * Read/Write one page using dma. Only pages can be read (512 bytes)
-*/
-static void r852_do_dma(struct r852_device *dev, uint8_t *buf, int do_read)
-{
-	int bounce = 0;
-	unsigned long flags;
-	int error;
-
-	dev->dma_error = 0;
-
-	/* Set dma direction */
-	dev->dma_dir = do_read;
-	dev->dma_stage = 1;
-	reinit_completion(&dev->dma_done);
-
-	dbg_verbose("doing dma %s ", do_read ? "read" : "write");
-
-	/* Set initial dma state: for reading first fill on board buffer,
-	  from device, for writes first fill the buffer  from memory*/
-	dev->dma_state = do_read ? DMA_INTERNAL : DMA_MEMORY;
-
-	/* if incoming buffer is not page aligned, we should do bounce */
-	if ((unsigned long)buf & (R852_DMA_LEN-1))
-		bounce = 1;
-
-	if (!bounce) {
-		dev->phys_dma_addr = pci_map_single(dev->pci_dev, (void *)buf,
-			R852_DMA_LEN,
-			(do_read ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE));
-
-		if (pci_dma_mapping_error(dev->pci_dev, dev->phys_dma_addr))
-			bounce = 1;
-	}
-
-	if (bounce) {
-		dbg_verbose("dma: using bounce buffer");
-		dev->phys_dma_addr = dev->phys_bounce_buffer;
-		if (!do_read)
-			memcpy(dev->bounce_buffer, buf, R852_DMA_LEN);
-	}
-
-	/* Enable DMA */
-	spin_lock_irqsave(&dev->irqlock, flags);
-	r852_dma_enable(dev);
-	spin_unlock_irqrestore(&dev->irqlock, flags);
-
-	/* Wait till complete */
-	error = r852_dma_wait(dev);
-
-	if (error) {
-		r852_dma_done(dev, error);
-		return;
-	}
-
-	if (do_read && bounce)
-		memcpy((void *)buf, dev->bounce_buffer, R852_DMA_LEN);
-}
-
-/*
- * Program data lines of the nand chip to send data to it
- */
-static void r852_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
-{
-	struct r852_device *dev = r852_get_dev(mtd);
-	uint32_t reg;
-
-	/* Don't allow any access to hardware if we suspect card removal */
-	if (dev->card_unstable)
-		return;
-
-	/* Special case for whole sector read */
-	if (len == R852_DMA_LEN && dev->dma_usable) {
-		r852_do_dma(dev, (uint8_t *)buf, 0);
-		return;
-	}
-
-	/* write DWORD chinks - faster */
-	while (len >= 4) {
-		reg = buf[0] | buf[1] << 8 | buf[2] << 16 | buf[3] << 24;
-		r852_write_reg_dword(dev, R852_DATALINE, reg);
-		buf += 4;
-		len -= 4;
-
-	}
-
-	/* write rest */
-	while (len > 0) {
-		r852_write_reg(dev, R852_DATALINE, *buf++);
-		len--;
-	}
-}
-
-/*
- * Read data lines of the nand chip to retrieve data
- */
-static void r852_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
-{
-	struct r852_device *dev = r852_get_dev(mtd);
-	uint32_t reg;
-
-	if (dev->card_unstable) {
-		/* since we can't signal error here, at least, return
-			predictable buffer */
-		memset(buf, 0, len);
-		return;
-	}
-
-	/* special case for whole sector read */
-	if (len == R852_DMA_LEN && dev->dma_usable) {
-		r852_do_dma(dev, buf, 1);
-		return;
-	}
-
-	/* read in dword sized chunks */
-	while (len >= 4) {
-
-		reg = r852_read_reg_dword(dev, R852_DATALINE);
-		*buf++ = reg & 0xFF;
-		*buf++ = (reg >> 8) & 0xFF;
-		*buf++ = (reg >> 16) & 0xFF;
-		*buf++ = (reg >> 24) & 0xFF;
-		len -= 4;
-	}
-
-	/* read the reset by bytes */
-	while (len--)
-		*buf++ = r852_read_reg(dev, R852_DATALINE);
-}
-
-/*
- * Read one byte from nand chip
- */
-static uint8_t r852_read_byte(struct mtd_info *mtd)
-{
-	struct r852_device *dev = r852_get_dev(mtd);
-
-	/* Same problem as in r852_read_buf.... */
-	if (dev->card_unstable)
-		return 0;
-
-	return r852_read_reg(dev, R852_DATALINE);
-}
-
-/*
- * Control several chip lines & send commands
- */
-static void r852_cmdctl(struct mtd_info *mtd, int dat, unsigned int ctrl)
-{
-	struct r852_device *dev = r852_get_dev(mtd);
-
-	if (dev->card_unstable)
-		return;
-
-	if (ctrl & NAND_CTRL_CHANGE) {
-
-		dev->ctlreg &= ~(R852_CTL_DATA | R852_CTL_COMMAND |
-				 R852_CTL_ON | R852_CTL_CARDENABLE);
-
-		if (ctrl & NAND_ALE)
-			dev->ctlreg |= R852_CTL_DATA;
-
-		if (ctrl & NAND_CLE)
-			dev->ctlreg |= R852_CTL_COMMAND;
-
-		if (ctrl & NAND_NCE)
-			dev->ctlreg |= (R852_CTL_CARDENABLE | R852_CTL_ON);
-		else
-			dev->ctlreg &= ~R852_CTL_WRITE;
-
-		/* when write is stareted, enable write access */
-		if (dat == NAND_CMD_ERASE1)
-			dev->ctlreg |= R852_CTL_WRITE;
-
-		r852_write_reg(dev, R852_CTL, dev->ctlreg);
-	}
-
-	 /* HACK: NAND_CMD_SEQIN is called without NAND_CTRL_CHANGE, but we need
-		to set write mode */
-	if (dat == NAND_CMD_SEQIN && (dev->ctlreg & R852_CTL_COMMAND)) {
-		dev->ctlreg |= R852_CTL_WRITE;
-		r852_write_reg(dev, R852_CTL, dev->ctlreg);
-	}
-
-	if (dat != NAND_CMD_NONE)
-		r852_write_reg(dev, R852_DATALINE, dat);
-}
-
-/*
- * Wait till card is ready.
- * based on nand_wait, but returns errors on DMA error
- */
-static int r852_wait(struct mtd_info *mtd, struct nand_chip *chip)
-{
-	struct r852_device *dev = nand_get_controller_data(chip);
-
-	unsigned long timeout;
-	u8 status;
-
-	timeout = jiffies + (chip->state == FL_ERASING ?
-		msecs_to_jiffies(400) : msecs_to_jiffies(20));
-
-	while (time_before(jiffies, timeout))
-		if (chip->dev_ready(mtd))
-			break;
-
-	nand_status_op(chip, &status);
-
-	/* Unfortunelly, no way to send detailed error status... */
-	if (dev->dma_error) {
-		status |= NAND_STATUS_FAIL;
-		dev->dma_error = 0;
-	}
-	return status;
-}
-
-/*
- * Check if card is ready
- */
-
-static int r852_ready(struct mtd_info *mtd)
-{
-	struct r852_device *dev = r852_get_dev(mtd);
-	return !(r852_read_reg(dev, R852_CARD_STA) & R852_CARD_STA_BUSY);
-}
-
-
-/*
- * Set ECC engine mode
-*/
-
-static void r852_ecc_hwctl(struct mtd_info *mtd, int mode)
-{
-	struct r852_device *dev = r852_get_dev(mtd);
-
-	if (dev->card_unstable)
-		return;
-
-	switch (mode) {
-	case NAND_ECC_READ:
-	case NAND_ECC_WRITE:
-		/* enable ecc generation/check*/
-		dev->ctlreg |= R852_CTL_ECC_ENABLE;
-
-		/* flush ecc buffer */
-		r852_write_reg(dev, R852_CTL,
-			dev->ctlreg | R852_CTL_ECC_ACCESS);
-
-		r852_read_reg_dword(dev, R852_DATALINE);
-		r852_write_reg(dev, R852_CTL, dev->ctlreg);
-		return;
-
-	case NAND_ECC_READSYN:
-		/* disable ecc generation */
-		dev->ctlreg &= ~R852_CTL_ECC_ENABLE;
-		r852_write_reg(dev, R852_CTL, dev->ctlreg);
-	}
-}
-
-/*
- * Calculate ECC, only used for writes
- */
-
-static int r852_ecc_calculate(struct mtd_info *mtd, const uint8_t *dat,
-							uint8_t *ecc_code)
-{
-	struct r852_device *dev = r852_get_dev(mtd);
-	struct sm_oob *oob = (struct sm_oob *)ecc_code;
-	uint32_t ecc1, ecc2;
-
-	if (dev->card_unstable)
-		return 0;
-
-	dev->ctlreg &= ~R852_CTL_ECC_ENABLE;
-	r852_write_reg(dev, R852_CTL, dev->ctlreg | R852_CTL_ECC_ACCESS);
-
-	ecc1 = r852_read_reg_dword(dev, R852_DATALINE);
-	ecc2 = r852_read_reg_dword(dev, R852_DATALINE);
-
-	oob->ecc1[0] = (ecc1) & 0xFF;
-	oob->ecc1[1] = (ecc1 >> 8) & 0xFF;
-	oob->ecc1[2] = (ecc1 >> 16) & 0xFF;
-
-	oob->ecc2[0] = (ecc2) & 0xFF;
-	oob->ecc2[1] = (ecc2 >> 8) & 0xFF;
-	oob->ecc2[2] = (ecc2 >> 16) & 0xFF;
-
-	r852_write_reg(dev, R852_CTL, dev->ctlreg);
-	return 0;
-}
-
-/*
- * Correct the data using ECC, hw did almost everything for us
- */
-
-static int r852_ecc_correct(struct mtd_info *mtd, uint8_t *dat,
-				uint8_t *read_ecc, uint8_t *calc_ecc)
-{
-	uint32_t ecc_reg;
-	uint8_t ecc_status, err_byte;
-	int i, error = 0;
-
-	struct r852_device *dev = r852_get_dev(mtd);
-
-	if (dev->card_unstable)
-		return 0;
-
-	if (dev->dma_error) {
-		dev->dma_error = 0;
-		return -EIO;
-	}
-
-	r852_write_reg(dev, R852_CTL, dev->ctlreg | R852_CTL_ECC_ACCESS);
-	ecc_reg = r852_read_reg_dword(dev, R852_DATALINE);
-	r852_write_reg(dev, R852_CTL, dev->ctlreg);
-
-	for (i = 0 ; i <= 1 ; i++) {
-
-		ecc_status = (ecc_reg >> 8) & 0xFF;
-
-		/* ecc uncorrectable error */
-		if (ecc_status & R852_ECC_FAIL) {
-			dbg("ecc: unrecoverable error, in half %d", i);
-			error = -EBADMSG;
-			goto exit;
-		}
-
-		/* correctable error */
-		if (ecc_status & R852_ECC_CORRECTABLE) {
-
-			err_byte = ecc_reg & 0xFF;
-			dbg("ecc: recoverable error, "
-				"in half %d, byte %d, bit %d", i,
-				err_byte, ecc_status & R852_ECC_ERR_BIT_MSK);
-
-			dat[err_byte] ^=
-				1 << (ecc_status & R852_ECC_ERR_BIT_MSK);
-			error++;
-		}
-
-		dat += 256;
-		ecc_reg >>= 16;
-	}
-exit:
-	return error;
-}
-
-/*
- * This is copy of nand_read_oob_std
- * nand_read_oob_syndrome assumes we can send column address - we can't
- */
-static int r852_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);
-}
-
-/*
- * Start the nand engine
- */
-
-static void r852_engine_enable(struct r852_device *dev)
-{
-	if (r852_read_reg_dword(dev, R852_HW) & R852_HW_UNKNOWN) {
-		r852_write_reg(dev, R852_CTL, R852_CTL_RESET | R852_CTL_ON);
-		r852_write_reg_dword(dev, R852_HW, R852_HW_ENABLED);
-	} else {
-		r852_write_reg_dword(dev, R852_HW, R852_HW_ENABLED);
-		r852_write_reg(dev, R852_CTL, R852_CTL_RESET | R852_CTL_ON);
-	}
-	msleep(300);
-	r852_write_reg(dev, R852_CTL, 0);
-}
-
-
-/*
- * Stop the nand engine
- */
-
-static void r852_engine_disable(struct r852_device *dev)
-{
-	r852_write_reg_dword(dev, R852_HW, 0);
-	r852_write_reg(dev, R852_CTL, R852_CTL_RESET);
-}
-
-/*
- * Test if card is present
- */
-
-static void r852_card_update_present(struct r852_device *dev)
-{
-	unsigned long flags;
-	uint8_t reg;
-
-	spin_lock_irqsave(&dev->irqlock, flags);
-	reg = r852_read_reg(dev, R852_CARD_STA);
-	dev->card_detected = !!(reg & R852_CARD_STA_PRESENT);
-	spin_unlock_irqrestore(&dev->irqlock, flags);
-}
-
-/*
- * Update card detection IRQ state according to current card state
- * which is read in r852_card_update_present
- */
-static void r852_update_card_detect(struct r852_device *dev)
-{
-	int card_detect_reg = r852_read_reg(dev, R852_CARD_IRQ_ENABLE);
-	dev->card_unstable = 0;
-
-	card_detect_reg &= ~(R852_CARD_IRQ_REMOVE | R852_CARD_IRQ_INSERT);
-	card_detect_reg |= R852_CARD_IRQ_GENABLE;
-
-	card_detect_reg |= dev->card_detected ?
-		R852_CARD_IRQ_REMOVE : R852_CARD_IRQ_INSERT;
-
-	r852_write_reg(dev, R852_CARD_IRQ_ENABLE, card_detect_reg);
-}
-
-static ssize_t r852_media_type_show(struct device *sys_dev,
-			struct device_attribute *attr, char *buf)
-{
-	struct mtd_info *mtd = container_of(sys_dev, struct mtd_info, dev);
-	struct r852_device *dev = r852_get_dev(mtd);
-	char *data = dev->sm ? "smartmedia" : "xd";
-
-	strcpy(buf, data);
-	return strlen(data);
-}
-
-static DEVICE_ATTR(media_type, S_IRUGO, r852_media_type_show, NULL);
-
-
-/* Detect properties of card in slot */
-static void r852_update_media_status(struct r852_device *dev)
-{
-	uint8_t reg;
-	unsigned long flags;
-	int readonly;
-
-	spin_lock_irqsave(&dev->irqlock, flags);
-	if (!dev->card_detected) {
-		message("card removed");
-		spin_unlock_irqrestore(&dev->irqlock, flags);
-		return ;
-	}
-
-	readonly  = r852_read_reg(dev, R852_CARD_STA) & R852_CARD_STA_RO;
-	reg = r852_read_reg(dev, R852_DMA_CAP);
-	dev->sm = (reg & (R852_DMA1 | R852_DMA2)) && (reg & R852_SMBIT);
-
-	message("detected %s %s card in slot",
-		dev->sm ? "SmartMedia" : "xD",
-		readonly ? "readonly" : "writeable");
-
-	dev->readonly = readonly;
-	spin_unlock_irqrestore(&dev->irqlock, flags);
-}
-
-/*
- * Register the nand device
- * Called when the card is detected
- */
-static int r852_register_nand_device(struct r852_device *dev)
-{
-	struct mtd_info *mtd = nand_to_mtd(dev->chip);
-
-	WARN_ON(dev->card_registred);
-
-	mtd->dev.parent = &dev->pci_dev->dev;
-
-	if (dev->readonly)
-		dev->chip->options |= NAND_ROM;
-
-	r852_engine_enable(dev);
-
-	if (sm_register_device(mtd, dev->sm))
-		goto error1;
-
-	if (device_create_file(&mtd->dev, &dev_attr_media_type)) {
-		message("can't create media type sysfs attribute");
-		goto error3;
-	}
-
-	dev->card_registred = 1;
-	return 0;
-error3:
-	nand_release(mtd);
-error1:
-	/* Force card redetect */
-	dev->card_detected = 0;
-	return -1;
-}
-
-/*
- * Unregister the card
- */
-
-static void r852_unregister_nand_device(struct r852_device *dev)
-{
-	struct mtd_info *mtd = nand_to_mtd(dev->chip);
-
-	if (!dev->card_registred)
-		return;
-
-	device_remove_file(&mtd->dev, &dev_attr_media_type);
-	nand_release(mtd);
-	r852_engine_disable(dev);
-	dev->card_registred = 0;
-}
-
-/* Card state updater */
-static void r852_card_detect_work(struct work_struct *work)
-{
-	struct r852_device *dev =
-		container_of(work, struct r852_device, card_detect_work.work);
-
-	r852_card_update_present(dev);
-	r852_update_card_detect(dev);
-	dev->card_unstable = 0;
-
-	/* False alarm */
-	if (dev->card_detected == dev->card_registred)
-		goto exit;
-
-	/* Read media properties */
-	r852_update_media_status(dev);
-
-	/* Register the card */
-	if (dev->card_detected)
-		r852_register_nand_device(dev);
-	else
-		r852_unregister_nand_device(dev);
-exit:
-	r852_update_card_detect(dev);
-}
-
-/* Ack + disable IRQ generation */
-static void r852_disable_irqs(struct r852_device *dev)
-{
-	uint8_t reg;
-	reg = r852_read_reg(dev, R852_CARD_IRQ_ENABLE);
-	r852_write_reg(dev, R852_CARD_IRQ_ENABLE, reg & ~R852_CARD_IRQ_MASK);
-
-	reg = r852_read_reg_dword(dev, R852_DMA_IRQ_ENABLE);
-	r852_write_reg_dword(dev, R852_DMA_IRQ_ENABLE,
-					reg & ~R852_DMA_IRQ_MASK);
-
-	r852_write_reg(dev, R852_CARD_IRQ_STA, R852_CARD_IRQ_MASK);
-	r852_write_reg_dword(dev, R852_DMA_IRQ_STA, R852_DMA_IRQ_MASK);
-}
-
-/* Interrupt handler */
-static irqreturn_t r852_irq(int irq, void *data)
-{
-	struct r852_device *dev = (struct r852_device *)data;
-
-	uint8_t card_status, dma_status;
-	unsigned long flags;
-	irqreturn_t ret = IRQ_NONE;
-
-	spin_lock_irqsave(&dev->irqlock, flags);
-
-	/* handle card detection interrupts first */
-	card_status = r852_read_reg(dev, R852_CARD_IRQ_STA);
-	r852_write_reg(dev, R852_CARD_IRQ_STA, card_status);
-
-	if (card_status & (R852_CARD_IRQ_INSERT|R852_CARD_IRQ_REMOVE)) {
-
-		ret = IRQ_HANDLED;
-		dev->card_detected = !!(card_status & R852_CARD_IRQ_INSERT);
-
-		/* we shouldn't receive any interrupts if we wait for card
-			to settle */
-		WARN_ON(dev->card_unstable);
-
-		/* disable irqs while card is unstable */
-		/* this will timeout DMA if active, but better that garbage */
-		r852_disable_irqs(dev);
-
-		if (dev->card_unstable)
-			goto out;
-
-		/* let, card state to settle a bit, and then do the work */
-		dev->card_unstable = 1;
-		queue_delayed_work(dev->card_workqueue,
-			&dev->card_detect_work, msecs_to_jiffies(100));
-		goto out;
-	}
-
-
-	/* Handle dma interrupts */
-	dma_status = r852_read_reg_dword(dev, R852_DMA_IRQ_STA);
-	r852_write_reg_dword(dev, R852_DMA_IRQ_STA, dma_status);
-
-	if (dma_status & R852_DMA_IRQ_MASK) {
-
-		ret = IRQ_HANDLED;
-
-		if (dma_status & R852_DMA_IRQ_ERROR) {
-			dbg("received dma error IRQ");
-			r852_dma_done(dev, -EIO);
-			complete(&dev->dma_done);
-			goto out;
-		}
-
-		/* received DMA interrupt out of nowhere? */
-		WARN_ON_ONCE(dev->dma_stage == 0);
-
-		if (dev->dma_stage == 0)
-			goto out;
-
-		/* done device access */
-		if (dev->dma_state == DMA_INTERNAL &&
-				(dma_status & R852_DMA_IRQ_INTERNAL)) {
-
-			dev->dma_state = DMA_MEMORY;
-			dev->dma_stage++;
-		}
-
-		/* done memory DMA */
-		if (dev->dma_state == DMA_MEMORY &&
-				(dma_status & R852_DMA_IRQ_MEMORY)) {
-			dev->dma_state = DMA_INTERNAL;
-			dev->dma_stage++;
-		}
-
-		/* Enable 2nd half of dma dance */
-		if (dev->dma_stage == 2)
-			r852_dma_enable(dev);
-
-		/* Operation done */
-		if (dev->dma_stage == 3) {
-			r852_dma_done(dev, 0);
-			complete(&dev->dma_done);
-		}
-		goto out;
-	}
-
-	/* Handle unknown interrupts */
-	if (dma_status)
-		dbg("bad dma IRQ status = %x", dma_status);
-
-	if (card_status & ~R852_CARD_STA_CD)
-		dbg("strange card status = %x", card_status);
-
-out:
-	spin_unlock_irqrestore(&dev->irqlock, flags);
-	return ret;
-}
-
-static int  r852_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
-{
-	int error;
-	struct nand_chip *chip;
-	struct r852_device *dev;
-
-	/* pci initialization */
-	error = pci_enable_device(pci_dev);
-
-	if (error)
-		goto error1;
-
-	pci_set_master(pci_dev);
-
-	error = pci_set_dma_mask(pci_dev, DMA_BIT_MASK(32));
-	if (error)
-		goto error2;
-
-	error = pci_request_regions(pci_dev, DRV_NAME);
-
-	if (error)
-		goto error3;
-
-	error = -ENOMEM;
-
-	/* init nand chip, but register it only on card insert */
-	chip = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
-
-	if (!chip)
-		goto error4;
-
-	/* commands */
-	chip->cmd_ctrl = r852_cmdctl;
-	chip->waitfunc = r852_wait;
-	chip->dev_ready = r852_ready;
-
-	/* I/O */
-	chip->read_byte = r852_read_byte;
-	chip->read_buf = r852_read_buf;
-	chip->write_buf = r852_write_buf;
-
-	/* ecc */
-	chip->ecc.mode = NAND_ECC_HW_SYNDROME;
-	chip->ecc.size = R852_DMA_LEN;
-	chip->ecc.bytes = SM_OOB_SIZE;
-	chip->ecc.strength = 2;
-	chip->ecc.hwctl = r852_ecc_hwctl;
-	chip->ecc.calculate = r852_ecc_calculate;
-	chip->ecc.correct = r852_ecc_correct;
-
-	/* TODO: hack */
-	chip->ecc.read_oob = r852_read_oob;
-
-	/* init our device structure */
-	dev = kzalloc(sizeof(struct r852_device), GFP_KERNEL);
-
-	if (!dev)
-		goto error5;
-
-	nand_set_controller_data(chip, dev);
-	dev->chip = chip;
-	dev->pci_dev = pci_dev;
-	pci_set_drvdata(pci_dev, dev);
-
-	dev->bounce_buffer = pci_alloc_consistent(pci_dev, R852_DMA_LEN,
-		&dev->phys_bounce_buffer);
-
-	if (!dev->bounce_buffer)
-		goto error6;
-
-
-	error = -ENODEV;
-	dev->mmio = pci_ioremap_bar(pci_dev, 0);
-
-	if (!dev->mmio)
-		goto error7;
-
-	error = -ENOMEM;
-	dev->tmp_buffer = kzalloc(SM_SECTOR_SIZE, GFP_KERNEL);
-
-	if (!dev->tmp_buffer)
-		goto error8;
-
-	init_completion(&dev->dma_done);
-
-	dev->card_workqueue = create_freezable_workqueue(DRV_NAME);
-
-	if (!dev->card_workqueue)
-		goto error9;
-
-	INIT_DELAYED_WORK(&dev->card_detect_work, r852_card_detect_work);
-
-	/* shutdown everything - precation */
-	r852_engine_disable(dev);
-	r852_disable_irqs(dev);
-
-	r852_dma_test(dev);
-
-	dev->irq = pci_dev->irq;
-	spin_lock_init(&dev->irqlock);
-
-	dev->card_detected = 0;
-	r852_card_update_present(dev);
-
-	/*register irq handler*/
-	error = -ENODEV;
-	if (request_irq(pci_dev->irq, &r852_irq, IRQF_SHARED,
-			  DRV_NAME, dev))
-		goto error10;
-
-	/* kick initial present test */
-	queue_delayed_work(dev->card_workqueue,
-		&dev->card_detect_work, 0);
-
-
-	printk(KERN_NOTICE DRV_NAME ": driver loaded successfully\n");
-	return 0;
-
-error10:
-	destroy_workqueue(dev->card_workqueue);
-error9:
-	kfree(dev->tmp_buffer);
-error8:
-	pci_iounmap(pci_dev, dev->mmio);
-error7:
-	pci_free_consistent(pci_dev, R852_DMA_LEN,
-		dev->bounce_buffer, dev->phys_bounce_buffer);
-error6:
-	kfree(dev);
-error5:
-	kfree(chip);
-error4:
-	pci_release_regions(pci_dev);
-error3:
-error2:
-	pci_disable_device(pci_dev);
-error1:
-	return error;
-}
-
-static void r852_remove(struct pci_dev *pci_dev)
-{
-	struct r852_device *dev = pci_get_drvdata(pci_dev);
-
-	/* Stop detect workqueue -
-		we are going to unregister the device anyway*/
-	cancel_delayed_work_sync(&dev->card_detect_work);
-	destroy_workqueue(dev->card_workqueue);
-
-	/* Unregister the device, this might make more IO */
-	r852_unregister_nand_device(dev);
-
-	/* Stop interrupts */
-	r852_disable_irqs(dev);
-	free_irq(dev->irq, dev);
-
-	/* Cleanup */
-	kfree(dev->tmp_buffer);
-	pci_iounmap(pci_dev, dev->mmio);
-	pci_free_consistent(pci_dev, R852_DMA_LEN,
-		dev->bounce_buffer, dev->phys_bounce_buffer);
-
-	kfree(dev->chip);
-	kfree(dev);
-
-	/* Shutdown the PCI device */
-	pci_release_regions(pci_dev);
-	pci_disable_device(pci_dev);
-}
-
-static void r852_shutdown(struct pci_dev *pci_dev)
-{
-	struct r852_device *dev = pci_get_drvdata(pci_dev);
-
-	cancel_delayed_work_sync(&dev->card_detect_work);
-	r852_disable_irqs(dev);
-	synchronize_irq(dev->irq);
-	pci_disable_device(pci_dev);
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int r852_suspend(struct device *device)
-{
-	struct r852_device *dev = pci_get_drvdata(to_pci_dev(device));
-
-	if (dev->ctlreg & R852_CTL_CARDENABLE)
-		return -EBUSY;
-
-	/* First make sure the detect work is gone */
-	cancel_delayed_work_sync(&dev->card_detect_work);
-
-	/* Turn off the interrupts and stop the device */
-	r852_disable_irqs(dev);
-	r852_engine_disable(dev);
-
-	/* If card was pulled off just during the suspend, which is very
-		unlikely, we will remove it on resume, it too late now
-		anyway... */
-	dev->card_unstable = 0;
-	return 0;
-}
-
-static int r852_resume(struct device *device)
-{
-	struct r852_device *dev = pci_get_drvdata(to_pci_dev(device));
-	struct mtd_info *mtd = nand_to_mtd(dev->chip);
-
-	r852_disable_irqs(dev);
-	r852_card_update_present(dev);
-	r852_engine_disable(dev);
-
-
-	/* If card status changed, just do the work */
-	if (dev->card_detected != dev->card_registred) {
-		dbg("card was %s during low power state",
-			dev->card_detected ? "added" : "removed");
-
-		queue_delayed_work(dev->card_workqueue,
-		&dev->card_detect_work, msecs_to_jiffies(1000));
-		return 0;
-	}
-
-	/* Otherwise, initialize the card */
-	if (dev->card_registred) {
-		r852_engine_enable(dev);
-		dev->chip->select_chip(mtd, 0);
-		nand_reset_op(dev->chip);
-		dev->chip->select_chip(mtd, -1);
-	}
-
-	/* Program card detection IRQ */
-	r852_update_card_detect(dev);
-	return 0;
-}
-#endif
-
-static const struct pci_device_id r852_pci_id_tbl[] = {
-
-	{ PCI_VDEVICE(RICOH, 0x0852), },
-	{ },
-};
-
-MODULE_DEVICE_TABLE(pci, r852_pci_id_tbl);
-
-static SIMPLE_DEV_PM_OPS(r852_pm_ops, r852_suspend, r852_resume);
-
-static struct pci_driver r852_pci_driver = {
-	.name		= DRV_NAME,
-	.id_table	= r852_pci_id_tbl,
-	.probe		= r852_probe,
-	.remove		= r852_remove,
-	.shutdown	= r852_shutdown,
-	.driver.pm	= &r852_pm_ops,
-};
-
-module_pci_driver(r852_pci_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
-MODULE_DESCRIPTION("Ricoh 85xx xD/smartmedia card reader driver");