/*
 * $Id: pmc551.c,v 1.18 2001/06/12 16:19:38 major Exp $
 *
 * PMC551 PCI Mezzanine Ram Device
 *
 * Author:
 *       Mark Ferrell <mferrell@mvista.com>
 *       Copyright 1999,2000 Nortel Networks
 *
 * License:
 *	 As part of this driver was derived from the slram.c driver it
 *	 falls under the same license, which is GNU General Public
 *	 License v2
 *
 * Description:
 *	 This driver is intended to support the PMC551 PCI Ram device
 *	 from Ramix Inc.  The PMC551 is a PMC Mezzanine module for
 *	 cPCI embedded systems.  The device contains a single SROM
 *	 that initially programs the V370PDC chipset onboard the
 *	 device, and various banks of DRAM/SDRAM onboard.  This driver
 *	 implements this PCI Ram device as an MTD (Memory Technology
 *	 Device) so that it can be used to hold a file system, or for
 *	 added swap space in embedded systems.  Since the memory on
 *	 this board isn't as fast as main memory we do not try to hook
 *	 it into main memory as that would simply reduce performance
 *	 on the system.  Using it as a block device allows us to use
 *	 it as high speed swap or for a high speed disk device of some
 *	 sort.  Which becomes very useful on diskless systems in the
 *	 embedded market I might add.
 *	 
 * Notes:
 *	 Due to what I assume is more buggy SROM, the 64M PMC551 I
 *	 have available claims that all 4 of it's DRAM banks have 64M
 *	 of ram configured (making a grand total of 256M onboard).
 *	 This is slightly annoying since the BAR0 size reflects the
 *	 aperture size, not the dram size, and the V370PDC supplies no
 *	 other method for memory size discovery.  This problem is
 *	 mostly only relevant when compiled as a module, as the
 *	 unloading of the module with an aperture size smaller then
 *	 the ram will cause the driver to detect the onboard memory
 *	 size to be equal to the aperture size when the module is
 *	 reloaded.  Soooo, to help, the module supports an msize
 *	 option to allow the specification of the onboard memory, and
 *	 an asize option, to allow the specification of the aperture
 *	 size.  The aperture must be equal to or less then the memory
 *	 size, the driver will correct this if you screw it up.  This
 *	 problem is not relevant for compiled in drivers as compiled
 *	 in drivers only init once.
 *
 * Credits:
 *       Saeed Karamooz <saeed@ramix.com> of Ramix INC. for the
 *       initial example code of how to initialize this device and for
 *       help with questions I had concerning operation of the device.
 *
 *       Most of the MTD code for this driver was originally written
 *       for the slram.o module in the MTD drivers package which
 *       allows the mapping of system memory into an MTD device.
 *       Since the PMC551 memory module is accessed in the same
 *       fashion as system memory, the slram.c code became a very nice
 *       fit to the needs of this driver.  All we added was PCI
 *       detection/initialization to the driver and automatically figure
 *       out the size via the PCI detection.o, later changes by Corey
 *       Minyard set up the card to utilize a 1M sliding apature.
 *
 *	 Corey Minyard <minyard@nortelnetworks.com>
 *       * Modified driver to utilize a sliding aperture instead of 
 *         mapping all memory into kernel space which turned out to
 *         be very wasteful.
 *       * Located a bug in the SROM's initialization sequence that 
 *         made the memory unusable, added a fix to code to touch up
 *         the DRAM some.
 *
 * Bugs/FIXME's:
 *       * MUST fix the init function to not spin on a register
 *       waiting for it to set .. this does not safely handle busted
 *       devices that never reset the register correctly which will
 *       cause the system to hang w/ a reboot being the only chance at
 *       recover. [sort of fixed, could be better]
 *       * Add I2C handling of the SROM so we can read the SROM's information
 *       about the aperture size.  This should always accurately reflect the
 *       onboard memory size.
 *       * Comb the init routine.  It's still a bit cludgy on a few things.
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/uaccess.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/major.h>
#include <linux/fs.h>
#include <linux/ioctl.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/segment.h>
#include <stdarg.h>
#include <linux/pci.h>

#ifndef CONFIG_PCI
#error Enable PCI in your kernel config
#endif

#include <linux/mtd/mtd.h>
#include <linux/mtd/pmc551.h>
#include <linux/mtd/compatmac.h>

#if LINUX_VERSION_CODE > 0x20300
#define PCI_BASE_ADDRESS(dev) (dev->resource[0].start)
#else
#define PCI_BASE_ADDRESS(dev) (dev->base_address[0])
#endif

static struct mtd_info *pmc551list;

static int pmc551_erase (struct mtd_info *mtd, struct erase_info *instr)
{
        struct mypriv *priv = (struct mypriv *)mtd->priv;
        u32 soff_hi, soff_lo; /* start address offset hi/lo */
        u32 eoff_hi, eoff_lo; /* end address offset hi/lo */
        unsigned long end;
	u_char *ptr;
	size_t retlen;

#ifdef CONFIG_MTD_PMC551_DEBUG
	printk(KERN_DEBUG "pmc551_erase(pos:%ld, len:%ld)\n", (long)instr->addr, (long)instr->len);
#endif

        end = instr->addr + instr->len - 1;

        /* Is it past the end? */
        if ( end > mtd->size ) {
#ifdef CONFIG_MTD_PMC551_DEBUG
	printk(KERN_DEBUG "pmc551_erase() out of bounds (%ld > %ld)\n", (long)end, (long)mtd->size);
#endif
                return -EINVAL;
        }

        eoff_hi = end & ~(priv->asize - 1);
        soff_hi = instr->addr & ~(priv->asize - 1);
        eoff_lo = end & (priv->asize - 1);
        soff_lo = instr->addr & (priv->asize - 1);

	pmc551_point (mtd, instr->addr, instr->len, &retlen, &ptr);

        if ( soff_hi == eoff_hi || mtd->size == priv->asize) {
                /* The whole thing fits within one access, so just one shot
                   will do it. */
                memset(ptr, 0xff, instr->len);
        } else {
                /* We have to do multiple writes to get all the data
                   written. */
                while (soff_hi != eoff_hi) {
#ifdef CONFIG_MTD_PMC551_DEBUG
			printk( KERN_DEBUG "pmc551_erase() soff_hi: %ld, eoff_hi: %ld\n", (long)soff_hi, (long)eoff_hi);
#endif
                        memset(ptr, 0xff, priv->asize);
                        if (soff_hi + priv->asize >= mtd->size) {
                                goto out;
                        }
                        soff_hi += priv->asize;
			pmc551_point (mtd,(priv->base_map0|soff_hi),
				      priv->asize, &retlen, &ptr);
                }
                memset (ptr, 0xff, eoff_lo);
        }

out:
	instr->state = MTD_ERASE_DONE;
#ifdef CONFIG_MTD_PMC551_DEBUG
	printk(KERN_DEBUG "pmc551_erase() done\n");
#endif

        if (instr->callback) {
                (*(instr->callback))(instr);
	}
        return 0;
}


static int pmc551_point (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf)
{
        struct mypriv *priv = (struct mypriv *)mtd->priv;
        u32 soff_hi;
        u32 soff_lo;

#ifdef CONFIG_MTD_PMC551_DEBUG
	printk(KERN_DEBUG "pmc551_point(%ld, %ld)\n", (long)from, (long)len);
#endif

	if (from + len > mtd->size) {
#ifdef CONFIG_MTD_PMC551_DEBUG
		printk(KERN_DEBUG "pmc551_point() out of bounds (%ld > %ld)\n", (long)from+len, (long)mtd->size);
#endif
		return -EINVAL;
	}

        soff_hi = from & ~(priv->asize - 1);
        soff_lo = from & (priv->asize - 1);

	/* Cheap hack optimization */
	if( priv->curr_map0 != from ) {
        	pci_write_config_dword ( priv->dev, PMC551_PCI_MEM_MAP0,
                                 	(priv->base_map0 | soff_hi) );
		priv->curr_map0 = soff_hi;
	}

	*mtdbuf = priv->start + soff_lo;
	*retlen = len;
	return 0;
}


static void pmc551_unpoint (struct mtd_info *mtd, u_char *addr)
{
#ifdef CONFIG_MTD_PMC551_DEBUG
	printk(KERN_DEBUG "pmc551_unpoint()\n");
#endif
}


static int pmc551_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
{
        struct mypriv *priv = (struct mypriv *)mtd->priv;
        u32 soff_hi, soff_lo; /* start address offset hi/lo */
        u32 eoff_hi, eoff_lo; /* end address offset hi/lo */
        unsigned long end;
	u_char *ptr;
        u_char *copyto = buf;

#ifdef CONFIG_MTD_PMC551_DEBUG
	printk(KERN_DEBUG "pmc551_read(pos:%ld, len:%ld) asize: %ld\n", (long)from, (long)len, (long)priv->asize);
#endif

        end = from + len - 1;

        /* Is it past the end? */
        if (end > mtd->size) {
#ifdef CONFIG_MTD_PMC551_DEBUG
	printk(KERN_DEBUG "pmc551_read() out of bounds (%ld > %ld)\n", (long) end, (long)mtd->size);
#endif
                return -EINVAL;
        }

        soff_hi = from & ~(priv->asize - 1);
        eoff_hi = end & ~(priv->asize - 1);
        soff_lo = from & (priv->asize - 1);
        eoff_lo = end & (priv->asize - 1);

	pmc551_point (mtd, from, len, retlen, &ptr);

        if (soff_hi == eoff_hi) {
                /* The whole thing fits within one access, so just one shot
                   will do it. */
                memcpy(copyto, ptr, len);
                copyto += len;
        } else {
                /* We have to do multiple writes to get all the data
                   written. */
                while (soff_hi != eoff_hi) {
#ifdef CONFIG_MTD_PMC551_DEBUG
			printk( KERN_DEBUG "pmc551_read() soff_hi: %ld, eoff_hi: %ld\n", (long)soff_hi, (long)eoff_hi);
#endif
                        memcpy(copyto, ptr, priv->asize);
                        copyto += priv->asize;
                        if (soff_hi + priv->asize >= mtd->size) {
                                goto out;
                        }
                        soff_hi += priv->asize;
			pmc551_point (mtd, soff_hi, priv->asize, retlen, &ptr);
                }
                memcpy(copyto, ptr, eoff_lo);
                copyto += eoff_lo;
        }

out:
#ifdef CONFIG_MTD_PMC551_DEBUG
	printk(KERN_DEBUG "pmc551_read() done\n");
#endif
        *retlen = copyto - buf;
        return 0;
}

static int pmc551_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
{
        struct mypriv *priv = (struct mypriv *)mtd->priv;
        u32 soff_hi, soff_lo; /* start address offset hi/lo */
        u32 eoff_hi, eoff_lo; /* end address offset hi/lo */
        unsigned long end;
	u_char *ptr;
        const u_char *copyfrom = buf;


#ifdef CONFIG_MTD_PMC551_DEBUG
	printk(KERN_DEBUG "pmc551_write(pos:%ld, len:%ld) asize:%ld\n", (long)to, (long)len, (long)priv->asize);
#endif

        end = to + len - 1;
        /* Is it past the end?  or did the u32 wrap? */
        if (end > mtd->size ) {
#ifdef CONFIG_MTD_PMC551_DEBUG
	printk(KERN_DEBUG "pmc551_write() out of bounds (end: %ld, size: %ld, to: %ld)\n", (long) end, (long)mtd->size, (long)to);
#endif
                return -EINVAL;
        }

        soff_hi = to & ~(priv->asize - 1);
        eoff_hi = end & ~(priv->asize - 1);
        soff_lo = to & (priv->asize - 1);
        eoff_lo = end & (priv->asize - 1);

	pmc551_point (mtd, to, len, retlen, &ptr);

        if (soff_hi == eoff_hi) {
                /* The whole thing fits within one access, so just one shot
                   will do it. */
                memcpy(ptr, copyfrom, len);
                copyfrom += len;
        } else {
                /* We have to do multiple writes to get all the data
                   written. */
                while (soff_hi != eoff_hi) {
#ifdef CONFIG_MTD_PMC551_DEBUG
			printk( KERN_DEBUG "pmc551_write() soff_hi: %ld, eoff_hi: %ld\n", (long)soff_hi, (long)eoff_hi);
#endif
                	memcpy(ptr, copyfrom, priv->asize);
                	copyfrom += priv->asize;
                        if (soff_hi >= mtd->size) {
                                goto out;
                        }
                        soff_hi += priv->asize;
			pmc551_point (mtd, soff_hi, priv->asize, retlen, &ptr);
                }
                memcpy(ptr, copyfrom, eoff_lo);
                copyfrom += eoff_lo;
        }

out:
#ifdef CONFIG_MTD_PMC551_DEBUG
	printk(KERN_DEBUG "pmc551_write() done\n");
#endif
        *retlen = copyfrom - buf;
        return 0;
}

/*
 * Fixup routines for the V370PDC
 * PCI device ID 0x020011b0
 *
 * This function basicly kick starts the DRAM oboard the card and gets it
 * ready to be used.  Before this is done the device reads VERY erratic, so
 * much that it can crash the Linux 2.2.x series kernels when a user cat's
 * /proc/pci .. though that is mainly a kernel bug in handling the PCI DEVSEL
 * register.  FIXME: stop spinning on registers .. must implement a timeout
 * mechanism
 * returns the size of the memory region found.
 */
static u32 fixup_pmc551 (struct pci_dev *dev)
{
#ifdef CONFIG_MTD_PMC551_BUGFIX
        u32 dram_data;
#endif
        u32 size, dcmd, cfg, dtmp;
        u16 cmd, tmp, i;
	u8 bcmd, counter;

        /* Sanity Check */
        if(!dev) {
                return -ENODEV;
        }

	/*
	 * Attempt to reset the card
	 * FIXME: Stop Spinning registers
	 */
	counter=0;
	/* unlock registers */
	pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, 0xA5 );
	/* read in old data */
	pci_read_config_byte(dev, PMC551_SYS_CTRL_REG, &bcmd );
	/* bang the reset line up and down for a few */
	for(i=0;i<10;i++) {
		counter=0;
		bcmd &= ~0x80;
		while(counter++ < 100) {
			pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, bcmd);
		}
		counter=0;
		bcmd |= 0x80;
		while(counter++ < 100) {
			pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, bcmd);
		}
	}
	bcmd |= (0x40|0x20);
	pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, bcmd);

        /* 
	 * Take care and turn off the memory on the device while we
	 * tweak the configurations
	 */
        pci_read_config_word(dev, PCI_COMMAND, &cmd);
        tmp = cmd & ~(PCI_COMMAND_IO|PCI_COMMAND_MEMORY);
        pci_write_config_word(dev, PCI_COMMAND, tmp);

	/*
	 * Disable existing aperture before probing memory size
	 */
	pci_read_config_dword(dev, PMC551_PCI_MEM_MAP0, &dcmd);
        dtmp=(dcmd|PMC551_PCI_MEM_MAP_ENABLE|PMC551_PCI_MEM_MAP_REG_EN);
	pci_write_config_dword(dev, PMC551_PCI_MEM_MAP0, dtmp);
	/*
	 * Grab old BAR0 config so that we can figure out memory size
	 * This is another bit of kludge going on.  The reason for the
	 * redundancy is I am hoping to retain the original configuration
	 * previously assigned to the card by the BIOS or some previous 
	 * fixup routine in the kernel.  So we read the old config into cfg,
	 * then write all 1's to the memory space, read back the result into
	 * "size", and then write back all the old config.
	 */
	pci_read_config_dword( dev, PCI_BASE_ADDRESS_0, &cfg );
#ifndef CONFIG_MTD_PMC551_BUGFIX
	pci_write_config_dword( dev, PCI_BASE_ADDRESS_0, ~0 );
	pci_read_config_dword( dev, PCI_BASE_ADDRESS_0, &size );
	size = (size&PCI_BASE_ADDRESS_MEM_MASK);
	size &= ~(size-1);
	pci_write_config_dword( dev, PCI_BASE_ADDRESS_0, cfg );
#else
        /*
         * Get the size of the memory by reading all the DRAM size values
         * and adding them up.
         *
         * KLUDGE ALERT: the boards we are using have invalid column and
         * row mux values.  We fix them here, but this will break other
         * memory configurations.
         */
        pci_read_config_dword(dev, PMC551_DRAM_BLK0, &dram_data);
        size = PMC551_DRAM_BLK_GET_SIZE(dram_data);
        dram_data = PMC551_DRAM_BLK_SET_COL_MUX(dram_data, 0x5);
        dram_data = PMC551_DRAM_BLK_SET_ROW_MUX(dram_data, 0x9);
        pci_write_config_dword(dev, PMC551_DRAM_BLK0, dram_data);

        pci_read_config_dword(dev, PMC551_DRAM_BLK1, &dram_data);
        size += PMC551_DRAM_BLK_GET_SIZE(dram_data);
        dram_data = PMC551_DRAM_BLK_SET_COL_MUX(dram_data, 0x5);
        dram_data = PMC551_DRAM_BLK_SET_ROW_MUX(dram_data, 0x9);
        pci_write_config_dword(dev, PMC551_DRAM_BLK1, dram_data);

        pci_read_config_dword(dev, PMC551_DRAM_BLK2, &dram_data);
        size += PMC551_DRAM_BLK_GET_SIZE(dram_data);
        dram_data = PMC551_DRAM_BLK_SET_COL_MUX(dram_data, 0x5);
        dram_data = PMC551_DRAM_BLK_SET_ROW_MUX(dram_data, 0x9);
        pci_write_config_dword(dev, PMC551_DRAM_BLK2, dram_data);

        pci_read_config_dword(dev, PMC551_DRAM_BLK3, &dram_data);
        size += PMC551_DRAM_BLK_GET_SIZE(dram_data);
        dram_data = PMC551_DRAM_BLK_SET_COL_MUX(dram_data, 0x5);
        dram_data = PMC551_DRAM_BLK_SET_ROW_MUX(dram_data, 0x9);
        pci_write_config_dword(dev, PMC551_DRAM_BLK3, dram_data);

        /*
         * Oops .. something went wrong
         */
        if( (size &= PCI_BASE_ADDRESS_MEM_MASK) == 0) {
                return -ENODEV;
        }
#endif /* CONFIG_MTD_PMC551_BUGFIX */

	if ((cfg&PCI_BASE_ADDRESS_SPACE) != PCI_BASE_ADDRESS_SPACE_MEMORY) {
                return -ENODEV;
	}

        /*
         * Precharge Dram
         */
        pci_write_config_word( dev, PMC551_SDRAM_MA, 0x0400 );
        pci_write_config_word( dev, PMC551_SDRAM_CMD, 0x00bf );

        /*
         * Wait until command has gone through
         * FIXME: register spinning issue
         */
        do {	pci_read_config_word( dev, PMC551_SDRAM_CMD, &cmd );
		if(counter++ > 100)break;
        } while ( (PCI_COMMAND_IO) & cmd );

        /*
	 * Turn on auto refresh 
	 * The loop is taken directly from Ramix's example code.  I assume that
	 * this must be held high for some duration of time, but I can find no
	 * documentation refrencing the reasons why.
         */
        for ( i = 1; i<=8 ; i++) {
                pci_write_config_word (dev, PMC551_SDRAM_CMD, 0x0df);

                /*
                 * Make certain command has gone through
                 * FIXME: register spinning issue
                 */
		counter=0;
                do {	pci_read_config_word(dev, PMC551_SDRAM_CMD, &cmd);
			if(counter++ > 100)break;
                } while ( (PCI_COMMAND_IO) & cmd );
        }

        pci_write_config_word ( dev, PMC551_SDRAM_MA, 0x0020);
        pci_write_config_word ( dev, PMC551_SDRAM_CMD, 0x0ff);

        /*
         * Wait until command completes
         * FIXME: register spinning issue
         */
	counter=0;
        do {	pci_read_config_word ( dev, PMC551_SDRAM_CMD, &cmd);
		if(counter++ > 100)break;
        } while ( (PCI_COMMAND_IO) & cmd );

        pci_read_config_dword ( dev, PMC551_DRAM_CFG, &dcmd);
        dcmd |= 0x02000000;
        pci_write_config_dword ( dev, PMC551_DRAM_CFG, dcmd);

        /*
         * Check to make certain fast back-to-back, if not
         * then set it so
         */
        pci_read_config_word( dev, PCI_STATUS, &cmd);
        if((cmd&PCI_COMMAND_FAST_BACK) == 0) {
                cmd |= PCI_COMMAND_FAST_BACK;
                pci_write_config_word( dev, PCI_STATUS, cmd);
        }

        /*
         * Check to make certain the DEVSEL is set correctly, this device
         * has a tendancy to assert DEVSEL and TRDY when a write is performed
         * to the memory when memory is read-only
         */
        if((cmd&PCI_STATUS_DEVSEL_MASK) != 0x0) {
                cmd &= ~PCI_STATUS_DEVSEL_MASK;
                pci_write_config_word( dev, PCI_STATUS, cmd );
        }
        /*
         * Set to be prefetchable and put everything back based on old cfg.
	 * it's possible that the reset of the V370PDC nuked the original
	 * setup
         */
	/*
        cfg |= PCI_BASE_ADDRESS_MEM_PREFETCH;
	pci_write_config_dword( dev, PCI_BASE_ADDRESS_0, cfg );
	*/

        /*
         * Turn PCI memory and I/O bus access back on
         */
        pci_write_config_word( dev, PCI_COMMAND,
                               PCI_COMMAND_MEMORY | PCI_COMMAND_IO );
#ifdef CONFIG_MTD_PMC551_DEBUG
        /*
         * Some screen fun
         */
        printk(KERN_DEBUG "pmc551: %d%c (0x%x) of %sprefetchable memory at 0x%lx\n",
	       (size<1024)?size:(size<1048576)?size>>10:size>>20,
               (size<1024)?'B':(size<1048576)?'K':'M',
	       size, ((dcmd&(0x1<<3)) == 0)?"non-":"",
               PCI_BASE_ADDRESS(dev)&PCI_BASE_ADDRESS_MEM_MASK );

        /*
         * Check to see the state of the memory
         */
        pci_read_config_dword( dev, PMC551_DRAM_BLK0, &dcmd );
        printk(KERN_DEBUG "pmc551: DRAM_BLK0 Flags: %s,%s\n"
			  "pmc551: DRAM_BLK0 Size: %d at %d\n"
			  "pmc551: DRAM_BLK0 Row MUX: %d, Col MUX: %d\n",
               (((0x1<<1)&dcmd) == 0)?"RW":"RO",
               (((0x1<<0)&dcmd) == 0)?"Off":"On",
	       PMC551_DRAM_BLK_GET_SIZE(dcmd),
	       ((dcmd>>20)&0x7FF), ((dcmd>>13)&0x7), ((dcmd>>9)&0xF) );

        pci_read_config_dword( dev, PMC551_DRAM_BLK1, &dcmd );
        printk(KERN_DEBUG "pmc551: DRAM_BLK1 Flags: %s,%s\n"
			  "pmc551: DRAM_BLK1 Size: %d at %d\n"
			  "pmc551: DRAM_BLK1 Row MUX: %d, Col MUX: %d\n",
               (((0x1<<1)&dcmd) == 0)?"RW":"RO",
               (((0x1<<0)&dcmd) == 0)?"Off":"On",
	       PMC551_DRAM_BLK_GET_SIZE(dcmd),
	       ((dcmd>>20)&0x7FF), ((dcmd>>13)&0x7), ((dcmd>>9)&0xF) );

        pci_read_config_dword( dev, PMC551_DRAM_BLK2, &dcmd );
        printk(KERN_DEBUG "pmc551: DRAM_BLK2 Flags: %s,%s\n"
			  "pmc551: DRAM_BLK2 Size: %d at %d\n"
			  "pmc551: DRAM_BLK2 Row MUX: %d, Col MUX: %d\n",
               (((0x1<<1)&dcmd) == 0)?"RW":"RO",
               (((0x1<<0)&dcmd) == 0)?"Off":"On",
	       PMC551_DRAM_BLK_GET_SIZE(dcmd),
	       ((dcmd>>20)&0x7FF), ((dcmd>>13)&0x7), ((dcmd>>9)&0xF) );

        pci_read_config_dword( dev, PMC551_DRAM_BLK3, &dcmd );
        printk(KERN_DEBUG "pmc551: DRAM_BLK3 Flags: %s,%s\n"
			  "pmc551: DRAM_BLK3 Size: %d at %d\n"
			  "pmc551: DRAM_BLK3 Row MUX: %d, Col MUX: %d\n",
               (((0x1<<1)&dcmd) == 0)?"RW":"RO",
               (((0x1<<0)&dcmd) == 0)?"Off":"On",
	       PMC551_DRAM_BLK_GET_SIZE(dcmd),
	       ((dcmd>>20)&0x7FF), ((dcmd>>13)&0x7), ((dcmd>>9)&0xF) );

        pci_read_config_word( dev, PCI_COMMAND, &cmd );
        printk( KERN_DEBUG "pmc551: Memory Access %s\n",
                (((0x1<<1)&cmd) == 0)?"off":"on" );
        printk( KERN_DEBUG "pmc551: I/O Access %s\n",
                (((0x1<<0)&cmd) == 0)?"off":"on" );

        pci_read_config_word( dev, PCI_STATUS, &cmd );
        printk( KERN_DEBUG "pmc551: Devsel %s\n",
                ((PCI_STATUS_DEVSEL_MASK&cmd)==0x000)?"Fast":
                ((PCI_STATUS_DEVSEL_MASK&cmd)==0x200)?"Medium":
                ((PCI_STATUS_DEVSEL_MASK&cmd)==0x400)?"Slow":"Invalid" );

        printk( KERN_DEBUG "pmc551: %sFast Back-to-Back\n",
                ((PCI_COMMAND_FAST_BACK&cmd) == 0)?"Not ":"" );

	pci_read_config_byte(dev, PMC551_SYS_CTRL_REG, &bcmd );
	printk( KERN_DEBUG "pmc551: EEPROM is under %s control\n"
			   "pmc551: System Control Register is %slocked to PCI access\n"
			   "pmc551: System Control Register is %slocked to EEPROM access\n", 
		(bcmd&0x1)?"software":"hardware",
		(bcmd&0x20)?"":"un", (bcmd&0x40)?"":"un");
#endif
        return size;
}

/*
 * Kernel version specific module stuffages
 */

#if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
#define init_pmc551 init_module
#define cleanup_pmc551 cleanup_module
#endif

#if defined(MODULE)
MODULE_AUTHOR("Mark Ferrell <mferrell@mvista.com>");
MODULE_DESCRIPTION(PMC551_VERSION);
MODULE_PARM(msize, "i");
MODULE_PARM_DESC(msize, "memory size in Megabytes [1 - 1024]");
MODULE_PARM(asize, "i");
MODULE_PARM_DESC(asize, "aperture size, must be <= memsize [1-1024]");
#endif
/*
 * Stuff these outside the ifdef so as to not bust compiled in driver support
 */
static int msize=0;
#if defined(CONFIG_MTD_PMC551_APERTURE_SIZE)
static int asize=CONFIG_MTD_PMC551_APERTURE_SIZE
#else
static int asize=0;
#endif

/*
 * PMC551 Card Initialization
 */
int __init init_pmc551(void)
{
        struct pci_dev *PCI_Device = NULL;
        struct mypriv *priv;
        int count, found=0;
        struct mtd_info *mtd;
        u32 length = 0;

	if(msize) {
		msize = (1 << (ffs(msize) - 1))<<20;
		if (msize > (1<<30)) {
			printk(KERN_NOTICE "pmc551: Invalid memory size [%d]\n", msize);
			return -EINVAL;
		}
	}

	if(asize) {
		asize = (1 << (ffs(asize) - 1))<<20;
		if (asize > (1<<30) ) {
			printk(KERN_NOTICE "pmc551: Invalid aperture size [%d]\n", asize);
			return -EINVAL;
		}
	}

        printk(KERN_INFO PMC551_VERSION);

        if(!pci_present()) {
                printk(KERN_NOTICE "pmc551: PCI not enabled.\n");
                return -ENODEV;
        }

        /*
         * PCU-bus chipset probe.
         */
        for( count = 0; count < MAX_MTD_DEVICES; count++ ) {

                if ((PCI_Device = pci_find_device(PCI_VENDOR_ID_V3_SEMI,
                                                  PCI_DEVICE_ID_V3_SEMI_V370PDC,
						  PCI_Device ) ) == NULL) {
                        break;
                }

                printk(KERN_NOTICE "pmc551: Found PCI V370PDC at 0x%lX\n",
				    PCI_BASE_ADDRESS(PCI_Device));

                /*
                 * The PMC551 device acts VERY weird if you don't init it
                 * first.  i.e. it will not correctly report devsel.  If for
                 * some reason the sdram is in a wrote-protected state the
                 * device will DEVSEL when it is written to causing problems
                 * with the oldproc.c driver in
                 * some kernels (2.2.*)
                 */
                if((length = fixup_pmc551(PCI_Device)) <= 0) {
                        printk(KERN_NOTICE "pmc551: Cannot init SDRAM\n");
                        break;
                }

		/*
		 * This is needed untill the driver is capable of reading the
		 * onboard I2C SROM to discover the "real" memory size.
		 */
		if(msize) {
			length = msize;
			printk(KERN_NOTICE "pmc551: Using specified memory size 0x%x\n", length);
		} else {
			msize = length;
		}

                mtd = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
                if (!mtd) {
                        printk(KERN_NOTICE "pmc551: Cannot allocate new MTD device.\n");
                        break;
                }

                memset(mtd, 0, sizeof(struct mtd_info));

                priv = kmalloc (sizeof(struct mypriv), GFP_KERNEL);
                if (!priv) {
                        printk(KERN_NOTICE "pmc551: Cannot allocate new MTD device.\n");
                        kfree(mtd);
                        break;
                }
                memset(priv, 0, sizeof(*priv));
                mtd->priv = priv;
                priv->dev = PCI_Device;

		if(asize > length) {
			printk(KERN_NOTICE "pmc551: reducing aperture size to fit %dM\n",length>>20);
			priv->asize = asize = length;
		} else if (asize == 0 || asize == length) {
			printk(KERN_NOTICE "pmc551: Using existing aperture size %dM\n", length>>20);
			priv->asize = asize = length;
		} else {
			printk(KERN_NOTICE "pmc551: Using specified aperture size %dM\n", asize>>20);
			priv->asize = asize;
		}
                priv->start = ioremap((PCI_BASE_ADDRESS(PCI_Device)
                                       & PCI_BASE_ADDRESS_MEM_MASK),
                                      priv->asize);
		
		if (!priv->start) {
			printk(KERN_NOTICE "pmc551: Unable to map IO space\n");
                        kfree(mtd->priv);
                        kfree(mtd);
			break;
		}

#ifdef CONFIG_MTD_PMC551_DEBUG
		printk( KERN_DEBUG "pmc551: setting aperture to %d\n",
			ffs(priv->asize>>20)-1);
#endif

                priv->base_map0 = ( PMC551_PCI_MEM_MAP_REG_EN
				  | PMC551_PCI_MEM_MAP_ENABLE
				  | (ffs(priv->asize>>20)-1)<<4 );
                priv->curr_map0 = priv->base_map0;
                pci_write_config_dword ( priv->dev, PMC551_PCI_MEM_MAP0,
                                         priv->curr_map0 );

#ifdef CONFIG_MTD_PMC551_DEBUG
		printk( KERN_DEBUG "pmc551: aperture set to %d\n", 
			(priv->base_map0 & 0xF0)>>4 );
#endif

                mtd->size 	= msize;
                mtd->flags 	= MTD_CAP_RAM;
                mtd->erase 	= pmc551_erase;
                mtd->read 	= pmc551_read;
                mtd->write 	= pmc551_write;
                mtd->point 	= pmc551_point;
                mtd->unpoint 	= pmc551_unpoint;
                mtd->module 	= THIS_MODULE;
                mtd->type 	= MTD_RAM;
                mtd->name 	= "PMC551 RAM board";
                mtd->erasesize 	= 0x10000;

                if (add_mtd_device(mtd)) {
                        printk(KERN_NOTICE "pmc551: Failed to register new device\n");
			iounmap(priv->start);
                        kfree(mtd->priv);
                        kfree(mtd);
                        break;
                }
                printk(KERN_NOTICE "Registered pmc551 memory device.\n");
                printk(KERN_NOTICE "Mapped %dM of memory from 0x%p to 0x%p\n",
                       priv->asize>>20,
                       priv->start,
                       priv->start + priv->asize);
                printk(KERN_NOTICE "Total memory is %d%c\n",
	       		(length<1024)?length:
				(length<1048576)?length>>10:length>>20,
               		(length<1024)?'B':(length<1048576)?'K':'M');
		priv->nextpmc551 = pmc551list;
		pmc551list = mtd;
		found++;
        }

        if( !pmc551list ) {
                printk(KERN_NOTICE "pmc551: not detected\n");
                return -ENODEV;
        } else {
		printk(KERN_NOTICE "pmc551: %d pmc551 devices loaded\n", found);
                return 0;
	}
}

/*
 * PMC551 Card Cleanup
 */
static void __exit cleanup_pmc551(void)
{
        int found=0;
        struct mtd_info *mtd;
	struct mypriv *priv;

	while((mtd=pmc551list)) {
		priv = (struct mypriv *)mtd->priv;
		pmc551list = priv->nextpmc551;
		
		if(priv->start) {
			printk (KERN_DEBUG "pmc551: unmapping %dM starting at 0x%p\n",
				priv->asize>>20, priv->start);
			iounmap (priv->start);
		}
		
		kfree (mtd->priv);
		del_mtd_device (mtd);
		kfree (mtd);
		found++;
	}

	printk(KERN_NOTICE "pmc551: %d pmc551 devices unloaded\n", found);
}

module_init(init_pmc551);
module_exit(cleanup_pmc551);
