1 files changed, 843 insertions, 0 deletions

diff --git a/drivers/mtd/devices/pmc551.c b/drivers/mtd/devices/pmc551.c
new file mode 100644
index 000000000000..5b3defadf884
--- /dev/null
+++ b/drivers/mtd/devices/pmc551.c
@@ -0,0 +1,843 @@
+/*
+ * $Id: pmc551.c,v 1.30 2005/01/05 18:05:13 dwmw2 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/version.h>
+#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 <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>
+
+static struct mtd_info *pmc551list;
+
+static int pmc551_erase (struct mtd_info *mtd, struct erase_info *instr)
+{
+        struct mypriv *priv = 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
+
+        mtd_erase_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 = 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, loff_t from, size_t len)
+{
+#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 = 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 = 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-":"",
+               (dev->resource[0].start)&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
+ */
+
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mark Ferrell <mferrell@mvista.com>");
+MODULE_DESCRIPTION(PMC551_VERSION);
+
+/*
+ * 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
+
+module_param(msize, int, 0);
+MODULE_PARM_DESC(msize, "memory size in Megabytes [1 - 1024]");
+module_param(asize, int, 0);
+MODULE_PARM_DESC(asize, "aperture size, must be <= memsize [1-1024]");
+
+/*
+ * PMC551 Card Initialization
+ */
+static 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);
+
+        /*
+         * 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_Device->resource[0].start);
+
+                /*
+                 * 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 until 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_Device->resource[0].start)
+                                       & 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->type       = MTD_RAM;
+                mtd->name       = "PMC551 RAM board";
+                mtd->erasesize  = 0x10000;
+                mtd->owner = THIS_MODULE;
+
+                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 = 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);