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pmc551.c

/*
 * $Id: pmc551.c,v 1.32 2005/11/07 11:14:25 gleixner 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 its DRAM banks have 64MiB
 *    of ram configured (making a grand total of 256MiB 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/FIXMEs:
 *    * 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/kernel.h>
#include <linux/module.h>
#include <asm/uaccess.h>
#include <linux/types.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>

#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%sB (0x%x) of %sprefetchable memory at "
            "0x%llx\n", (size < 1024) ? size : (size < 1048576) ?
            size >> 10 : size >> 20,
            (size < 1024) ? "" : (size < 1048576) ? "Ki" : "Mi", size,
            ((dcmd & (0x1 << 3)) == 0) ? "non-" : "",
            (unsigned long long)pci_resource_start(dev, 0));

      /*
       * 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;
static int asize = 0;

module_param(msize, int, 0);
MODULE_PARM_DESC(msize, "memory size in MiB [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_get_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%llx\n",
                  (unsigned long long)pci_resource_start(PCI_Device, 0));

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

            priv = kzalloc(sizeof(struct mypriv), GFP_KERNEL);
            if (!priv) {
                  printk(KERN_NOTICE "pmc551: Cannot allocate new MTD "
                        "device.\n");
                  kfree(mtd);
                  break;
            }
            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 = pci_iomap(PCI_Device, 0, 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->writesize = 1;
            mtd->owner = THIS_MODULE;

            if (add_mtd_device(mtd)) {
                  printk(KERN_NOTICE "pmc551: Failed to register new device\n");
                  pci_iounmap(PCI_Device, priv->start);
                  kfree(mtd->priv);
                  kfree(mtd);
                  break;
            }

            /* Keep a reference as the add_mtd_device worked */
            pci_dev_get(PCI_Device);

            printk(KERN_NOTICE "Registered pmc551 memory device.\n");
            printk(KERN_NOTICE "Mapped %dMiB 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%sB\n",
                  (length < 1024) ? length :
                  (length < 1048576) ? length >> 10 : length >> 20,
                  (length < 1024) ? "" : (length < 1048576) ? "Ki" : "Mi");
            priv->nextpmc551 = pmc551list;
            pmc551list = mtd;
            found++;
      }

      /* Exited early, reference left over */
      if (PCI_Device)
            pci_dev_put(PCI_Device);

      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 %dMiB starting at "
                        "0x%p\n", priv->asize >> 20, priv->start);
                  pci_iounmap(priv->dev, priv->start);
            }
            pci_dev_put(priv->dev);

            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);

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