drivers/mtd/devices/pmc551.c

   1 /*
   2  * $Id: pmc551.c,v 1.32 2005/11/07 11:14:25 gleixner Exp $
   3  *
   4  * PMC551 PCI Mezzanine Ram Device
   5  *
   6  * Author:
   7  *      Mark Ferrell <mferrell@mvista.com>
   8  *      Copyright 1999,2000 Nortel Networks
   9  *
  10  * License:
  11  *      As part of this driver was derived from the slram.c driver it
  12  *      falls under the same license, which is GNU General Public
  13  *      License v2
  14  *
  15  * Description:
  16  *      This driver is intended to support the PMC551 PCI Ram device
  17  *      from Ramix Inc.  The PMC551 is a PMC Mezzanine module for
  18  *      cPCI embedded systems.  The device contains a single SROM
  19  *      that initially programs the V370PDC chipset onboard the
  20  *      device, and various banks of DRAM/SDRAM onboard.  This driver
  21  *      implements this PCI Ram device as an MTD (Memory Technology
  22  *      Device) so that it can be used to hold a file system, or for
  23  *      added swap space in embedded systems.  Since the memory on
  24  *      this board isn't as fast as main memory we do not try to hook
  25  *      it into main memory as that would simply reduce performance
  26  *      on the system.  Using it as a block device allows us to use
  27  *      it as high speed swap or for a high speed disk device of some
  28  *      sort.  Which becomes very useful on diskless systems in the
  29  *      embedded market I might add.
  30  *
  31  * Notes:
  32  *      Due to what I assume is more buggy SROM, the 64M PMC551 I
  33  *      have available claims that all 4 of it's DRAM banks have 64M
  34  *      of ram configured (making a grand total of 256M onboard).
  35  *      This is slightly annoying since the BAR0 size reflects the
  36  *      aperture size, not the dram size, and the V370PDC supplies no
  37  *      other method for memory size discovery.  This problem is
  38  *      mostly only relevant when compiled as a module, as the
  39  *      unloading of the module with an aperture size smaller then
  40  *      the ram will cause the driver to detect the onboard memory
  41  *      size to be equal to the aperture size when the module is
  42  *      reloaded.  Soooo, to help, the module supports an msize
  43  *      option to allow the specification of the onboard memory, and
  44  *      an asize option, to allow the specification of the aperture
  45  *      size.  The aperture must be equal to or less then the memory
  46  *      size, the driver will correct this if you screw it up.  This
  47  *      problem is not relevant for compiled in drivers as compiled
  48  *      in drivers only init once.
  49  *
  50  * Credits:
  51  *      Saeed Karamooz <saeed@ramix.com> of Ramix INC. for the
  52  *      initial example code of how to initialize this device and for
  53  *      help with questions I had concerning operation of the device.
  54  *
  55  *      Most of the MTD code for this driver was originally written
  56  *      for the slram.o module in the MTD drivers package which
  57  *      allows the mapping of system memory into an MTD device.
  58  *      Since the PMC551 memory module is accessed in the same
  59  *      fashion as system memory, the slram.c code became a very nice
  60  *      fit to the needs of this driver.  All we added was PCI
  61  *      detection/initialization to the driver and automatically figure
  62  *      out the size via the PCI detection.o, later changes by Corey
  63  *      Minyard set up the card to utilize a 1M sliding apature.
  64  *
  65  *      Corey Minyard <minyard@nortelnetworks.com>
  66  *      * Modified driver to utilize a sliding aperture instead of
  67  *       mapping all memory into kernel space which turned out to
  68  *       be very wasteful.
  69  *      * Located a bug in the SROM's initialization sequence that
  70  *       made the memory unusable, added a fix to code to touch up
  71  *       the DRAM some.
  72  *
  73  * Bugs/FIXME's:
  74  *      * MUST fix the init function to not spin on a register
  75  *      waiting for it to set .. this does not safely handle busted
  76  *      devices that never reset the register correctly which will
  77  *      cause the system to hang w/ a reboot being the only chance at
  78  *      recover. [sort of fixed, could be better]
  79  *      * Add I2C handling of the SROM so we can read the SROM's information
  80  *      about the aperture size.  This should always accurately reflect the
  81  *      onboard memory size.
  82  *      * Comb the init routine.  It's still a bit cludgy on a few things.
  83  */
  84
  85 #include <linux/kernel.h>
  86 #include <linux/module.h>
  87 #include <asm/uaccess.h>
  88 #include <linux/types.h>
  89 #include <linux/sched.h>
  90 #include <linux/init.h>
  91 #include <linux/ptrace.h>
  92 #include <linux/slab.h>
  93 #include <linux/string.h>
  94 #include <linux/timer.h>
  95 #include <linux/major.h>
  96 #include <linux/fs.h>
  97 #include <linux/ioctl.h>
  98 #include <asm/io.h>
  99 #include <asm/system.h>
 100 #include <linux/pci.h>
 101
 102 #include <linux/mtd/mtd.h>
 103 #include <linux/mtd/pmc551.h>
 104 #include <linux/mtd/compatmac.h>
 105
 106 static struct mtd_info *pmc551list;
 107
 108 static int pmc551_erase(struct mtd_info *mtd, struct erase_info *instr)
 109 {
 110         struct mypriv *priv = mtd->priv;
 111         u32 soff_hi, soff_lo;   /* start address offset hi/lo */
 112         u32 eoff_hi, eoff_lo;   /* end address offset hi/lo */
 113         unsigned long end;
 114         u_char *ptr;
 115         size_t retlen;
 116
 117 #ifdef CONFIG_MTD_PMC551_DEBUG
 118         printk(KERN_DEBUG "pmc551_erase(pos:%ld, len:%ld)\n", (long)instr->addr,
 119                 (long)instr->len);
 120 #endif
 121
 122         end = instr->addr + instr->len - 1;
 123
 124         /* Is it past the end? */
 125         if (end > mtd->size) {
 126 #ifdef CONFIG_MTD_PMC551_DEBUG
 127                 printk(KERN_DEBUG "pmc551_erase() out of bounds (%ld > %ld)\n",
 128                         (long)end, (long)mtd->size);
 129 #endif
 130                 return -EINVAL;
 131         }
 132
 133         eoff_hi = end & ~(priv->asize - 1);
 134         soff_hi = instr->addr & ~(priv->asize - 1);
 135         eoff_lo = end & (priv->asize - 1);
 136         soff_lo = instr->addr & (priv->asize - 1);
 137
 138         pmc551_point(mtd, instr->addr, instr->len, &retlen, &ptr);
 139
 140         if (soff_hi == eoff_hi || mtd->size == priv->asize) {
 141                 /* The whole thing fits within one access, so just one shot
 142                    will do it. */
 143                 memset(ptr, 0xff, instr->len);
 144         } else {
 145                 /* We have to do multiple writes to get all the data
 146                    written. */
 147                 while (soff_hi != eoff_hi) {
 148 #ifdef CONFIG_MTD_PMC551_DEBUG
 149                         printk(KERN_DEBUG "pmc551_erase() soff_hi: %ld, "
 150                                 "eoff_hi: %ld\n", (long)soff_hi, (long)eoff_hi);
 151 #endif
 152                         memset(ptr, 0xff, priv->asize);
 153                         if (soff_hi + priv->asize >= mtd->size) {
 154                                 goto out;
 155                         }
 156                         soff_hi += priv->asize;
 157                         pmc551_point(mtd, (priv->base_map0 | soff_hi),
 158                                      priv->asize, &retlen, &ptr);
 159                 }
 160                 memset(ptr, 0xff, eoff_lo);
 161         }
 162
 163       out:
 164         instr->state = MTD_ERASE_DONE;
 165 #ifdef CONFIG_MTD_PMC551_DEBUG
 166         printk(KERN_DEBUG "pmc551_erase() done\n");
 167 #endif
 168
 169         mtd_erase_callback(instr);
 170         return 0;
 171 }
 172
 173 static int pmc551_point(struct mtd_info *mtd, loff_t from, size_t len,
 174                         size_t * retlen, u_char ** mtdbuf)
 175 {
 176         struct mypriv *priv = mtd->priv;
 177         u32 soff_hi;
 178         u32 soff_lo;
 179
 180 #ifdef CONFIG_MTD_PMC551_DEBUG
 181         printk(KERN_DEBUG "pmc551_point(%ld, %ld)\n", (long)from, (long)len);
 182 #endif
 183
 184         if (from + len > mtd->size) {
 185 #ifdef CONFIG_MTD_PMC551_DEBUG
 186                 printk(KERN_DEBUG "pmc551_point() out of bounds (%ld > %ld)\n",
 187                         (long)from + len, (long)mtd->size);
 188 #endif
 189                 return -EINVAL;
 190         }
 191
 192         soff_hi = from & ~(priv->asize - 1);
 193         soff_lo = from & (priv->asize - 1);
 194
 195         /* Cheap hack optimization */
 196         if (priv->curr_map0 != from) {
 197                 pci_write_config_dword(priv->dev, PMC551_PCI_MEM_MAP0,
 198                                         (priv->base_map0 | soff_hi));
 199                 priv->curr_map0 = soff_hi;
 200         }
 201
 202         *mtdbuf = priv->start + soff_lo;
 203         *retlen = len;
 204         return 0;
 205 }
 206
 207 static void pmc551_unpoint(struct mtd_info *mtd, u_char * addr, loff_t from,
 208                            size_t len)
 209 {
 210 #ifdef CONFIG_MTD_PMC551_DEBUG
 211         printk(KERN_DEBUG "pmc551_unpoint()\n");
 212 #endif
 213 }
 214
 215 static int pmc551_read(struct mtd_info *mtd, loff_t from, size_t len,
 216                         size_t * retlen, u_char * buf)
 217 {
 218         struct mypriv *priv = mtd->priv;
 219         u32 soff_hi, soff_lo;   /* start address offset hi/lo */
 220         u32 eoff_hi, eoff_lo;   /* end address offset hi/lo */
 221         unsigned long end;
 222         u_char *ptr;
 223         u_char *copyto = buf;
 224
 225 #ifdef CONFIG_MTD_PMC551_DEBUG
 226         printk(KERN_DEBUG "pmc551_read(pos:%ld, len:%ld) asize: %ld\n",
 227                 (long)from, (long)len, (long)priv->asize);
 228 #endif
 229
 230         end = from + len - 1;
 231
 232         /* Is it past the end? */
 233         if (end > mtd->size) {
 234 #ifdef CONFIG_MTD_PMC551_DEBUG
 235                 printk(KERN_DEBUG "pmc551_read() out of bounds (%ld > %ld)\n",
 236                         (long)end, (long)mtd->size);
 237 #endif
 238                 return -EINVAL;
 239         }
 240
 241         soff_hi = from & ~(priv->asize - 1);
 242         eoff_hi = end & ~(priv->asize - 1);
 243         soff_lo = from & (priv->asize - 1);
 244         eoff_lo = end & (priv->asize - 1);
 245
 246         pmc551_point(mtd, from, len, retlen, &ptr);
 247
 248         if (soff_hi == eoff_hi) {
 249                 /* The whole thing fits within one access, so just one shot
 250                    will do it. */
 251                 memcpy(copyto, ptr, len);
 252                 copyto += len;
 253         } else {
 254                 /* We have to do multiple writes to get all the data
 255                    written. */
 256                 while (soff_hi != eoff_hi) {
 257 #ifdef CONFIG_MTD_PMC551_DEBUG
 258                         printk(KERN_DEBUG "pmc551_read() soff_hi: %ld, "
 259                                 "eoff_hi: %ld\n", (long)soff_hi, (long)eoff_hi);
 260 #endif
 261                         memcpy(copyto, ptr, priv->asize);
 262                         copyto += priv->asize;
 263                         if (soff_hi + priv->asize >= mtd->size) {
 264                                 goto out;
 265                         }
 266                         soff_hi += priv->asize;
 267                         pmc551_point(mtd, soff_hi, priv->asize, retlen, &ptr);
 268                 }
 269                 memcpy(copyto, ptr, eoff_lo);
 270                 copyto += eoff_lo;
 271         }
 272
 273       out:
 274 #ifdef CONFIG_MTD_PMC551_DEBUG
 275         printk(KERN_DEBUG "pmc551_read() done\n");
 276 #endif
 277         *retlen = copyto - buf;
 278         return 0;
 279 }
 280
 281 static int pmc551_write(struct mtd_info *mtd, loff_t to, size_t len,
 282                         size_t * retlen, const u_char * buf)
 283 {
 284         struct mypriv *priv = mtd->priv;
 285         u32 soff_hi, soff_lo;   /* start address offset hi/lo */
 286         u32 eoff_hi, eoff_lo;   /* end address offset hi/lo */
 287         unsigned long end;
 288         u_char *ptr;
 289         const u_char *copyfrom = buf;
 290
 291 #ifdef CONFIG_MTD_PMC551_DEBUG
 292         printk(KERN_DEBUG "pmc551_write(pos:%ld, len:%ld) asize:%ld\n",
 293                 (long)to, (long)len, (long)priv->asize);
 294 #endif
 295
 296         end = to + len - 1;
 297         /* Is it past the end?  or did the u32 wrap? */
 298         if (end > mtd->size) {
 299 #ifdef CONFIG_MTD_PMC551_DEBUG
 300                 printk(KERN_DEBUG "pmc551_write() out of bounds (end: %ld, "
 301                         "size: %ld, to: %ld)\n", (long)end, (long)mtd->size,
 302                         (long)to);
 303 #endif
 304                 return -EINVAL;
 305         }
 306
 307         soff_hi = to & ~(priv->asize - 1);
 308         eoff_hi = end & ~(priv->asize - 1);
 309         soff_lo = to & (priv->asize - 1);
 310         eoff_lo = end & (priv->asize - 1);
 311
 312         pmc551_point(mtd, to, len, retlen, &ptr);
 313
 314         if (soff_hi == eoff_hi) {
 315                 /* The whole thing fits within one access, so just one shot
 316                    will do it. */
 317                 memcpy(ptr, copyfrom, len);
 318                 copyfrom += len;
 319         } else {
 320                 /* We have to do multiple writes to get all the data
 321                    written. */
 322                 while (soff_hi != eoff_hi) {
 323 #ifdef CONFIG_MTD_PMC551_DEBUG
 324                         printk(KERN_DEBUG "pmc551_write() soff_hi: %ld, "
 325                                 "eoff_hi: %ld\n", (long)soff_hi, (long)eoff_hi);
 326 #endif
 327                         memcpy(ptr, copyfrom, priv->asize);
 328                         copyfrom += priv->asize;
 329                         if (soff_hi >= mtd->size) {
 330                                 goto out;
 331                         }
 332                         soff_hi += priv->asize;
 333                         pmc551_point(mtd, soff_hi, priv->asize, retlen, &ptr);
 334                 }
 335                 memcpy(ptr, copyfrom, eoff_lo);
 336                 copyfrom += eoff_lo;
 337         }
 338
 339       out:
 340 #ifdef CONFIG_MTD_PMC551_DEBUG
 341         printk(KERN_DEBUG "pmc551_write() done\n");
 342 #endif
 343         *retlen = copyfrom - buf;
 344         return 0;
 345 }
 346
 347 /*
 348  * Fixup routines for the V370PDC
 349  * PCI device ID 0x020011b0
 350  *
 351  * This function basicly kick starts the DRAM oboard the card and gets it
 352  * ready to be used.  Before this is done the device reads VERY erratic, so
 353  * much that it can crash the Linux 2.2.x series kernels when a user cat's
 354  * /proc/pci .. though that is mainly a kernel bug in handling the PCI DEVSEL
 355  * register.  FIXME: stop spinning on registers .. must implement a timeout
 356  * mechanism
 357  * returns the size of the memory region found.
 358  */
 359 static u32 fixup_pmc551(struct pci_dev *dev)
 360 {
 361 #ifdef CONFIG_MTD_PMC551_BUGFIX
 362         u32 dram_data;
 363 #endif
 364         u32 size, dcmd, cfg, dtmp;
 365         u16 cmd, tmp, i;
 366         u8 bcmd, counter;
 367
 368         /* Sanity Check */
 369         if (!dev) {
 370                 return -ENODEV;
 371         }
 372
 373         /*
 374          * Attempt to reset the card
 375          * FIXME: Stop Spinning registers
 376          */
 377         counter = 0;
 378         /* unlock registers */
 379         pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, 0xA5);
 380         /* read in old data */
 381         pci_read_config_byte(dev, PMC551_SYS_CTRL_REG, &bcmd);
 382         /* bang the reset line up and down for a few */
 383         for (i = 0; i < 10; i++) {
 384                 counter = 0;
 385                 bcmd &= ~0x80;
 386                 while (counter++ < 100) {
 387                         pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, bcmd);
 388                 }
 389                 counter = 0;
 390                 bcmd |= 0x80;
 391                 while (counter++ < 100) {
 392                         pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, bcmd);
 393                 }
 394         }
 395         bcmd |= (0x40 | 0x20);
 396         pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, bcmd);
 397
 398         /*
 399          * Take care and turn off the memory on the device while we
 400          * tweak the configurations
 401          */
 402         pci_read_config_word(dev, PCI_COMMAND, &cmd);
 403         tmp = cmd & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
 404         pci_write_config_word(dev, PCI_COMMAND, tmp);
 405
 406         /*
 407          * Disable existing aperture before probing memory size
 408          */
 409         pci_read_config_dword(dev, PMC551_PCI_MEM_MAP0, &dcmd);
 410         dtmp = (dcmd | PMC551_PCI_MEM_MAP_ENABLE | PMC551_PCI_MEM_MAP_REG_EN);
 411         pci_write_config_dword(dev, PMC551_PCI_MEM_MAP0, dtmp);
 412         /*
 413          * Grab old BAR0 config so that we can figure out memory size
 414          * This is another bit of kludge going on.  The reason for the
 415          * redundancy is I am hoping to retain the original configuration
 416          * previously assigned to the card by the BIOS or some previous
 417          * fixup routine in the kernel.  So we read the old config into cfg,
 418          * then write all 1's to the memory space, read back the result into
 419          * "size", and then write back all the old config.
 420          */
 421         pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &cfg);
 422 #ifndef CONFIG_MTD_PMC551_BUGFIX
 423         pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, ~0);
 424         pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &size);
 425         size = (size & PCI_BASE_ADDRESS_MEM_MASK);
 426         size &= ~(size - 1);
 427         pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, cfg);
 428 #else
 429         /*
 430          * Get the size of the memory by reading all the DRAM size values
 431          * and adding them up.
 432          *
 433          * KLUDGE ALERT: the boards we are using have invalid column and
 434          * row mux values.  We fix them here, but this will break other
 435          * memory configurations.
 436          */
 437         pci_read_config_dword(dev, PMC551_DRAM_BLK0, &dram_data);
 438         size = PMC551_DRAM_BLK_GET_SIZE(dram_data);
 439         dram_data = PMC551_DRAM_BLK_SET_COL_MUX(dram_data, 0x5);
 440         dram_data = PMC551_DRAM_BLK_SET_ROW_MUX(dram_data, 0x9);
 441         pci_write_config_dword(dev, PMC551_DRAM_BLK0, dram_data);
 442
 443         pci_read_config_dword(dev, PMC551_DRAM_BLK1, &dram_data);
 444         size += PMC551_DRAM_BLK_GET_SIZE(dram_data);
 445         dram_data = PMC551_DRAM_BLK_SET_COL_MUX(dram_data, 0x5);
 446         dram_data = PMC551_DRAM_BLK_SET_ROW_MUX(dram_data, 0x9);
 447         pci_write_config_dword(dev, PMC551_DRAM_BLK1, dram_data);
 448
 449         pci_read_config_dword(dev, PMC551_DRAM_BLK2, &dram_data);
 450         size += PMC551_DRAM_BLK_GET_SIZE(dram_data);
 451         dram_data = PMC551_DRAM_BLK_SET_COL_MUX(dram_data, 0x5);
 452         dram_data = PMC551_DRAM_BLK_SET_ROW_MUX(dram_data, 0x9);
 453         pci_write_config_dword(dev, PMC551_DRAM_BLK2, dram_data);
 454
 455         pci_read_config_dword(dev, PMC551_DRAM_BLK3, &dram_data);
 456         size += PMC551_DRAM_BLK_GET_SIZE(dram_data);
 457         dram_data = PMC551_DRAM_BLK_SET_COL_MUX(dram_data, 0x5);
 458         dram_data = PMC551_DRAM_BLK_SET_ROW_MUX(dram_data, 0x9);
 459         pci_write_config_dword(dev, PMC551_DRAM_BLK3, dram_data);
 460
 461         /*
 462          * Oops .. something went wrong
 463          */
 464         if ((size &= PCI_BASE_ADDRESS_MEM_MASK) == 0) {
 465                 return -ENODEV;
 466         }
 467 #endif                          /* CONFIG_MTD_PMC551_BUGFIX */
 468
 469         if ((cfg & PCI_BASE_ADDRESS_SPACE) != PCI_BASE_ADDRESS_SPACE_MEMORY) {
 470                 return -ENODEV;
 471         }
 472
 473         /*
 474          * Precharge Dram
 475          */
 476         pci_write_config_word(dev, PMC551_SDRAM_MA, 0x0400);
 477         pci_write_config_word(dev, PMC551_SDRAM_CMD, 0x00bf);
 478
 479         /*
 480          * Wait until command has gone through
 481          * FIXME: register spinning issue
 482          */
 483         do {
 484                 pci_read_config_word(dev, PMC551_SDRAM_CMD, &cmd);
 485                 if (counter++ > 100)
 486                         break;
 487         } while ((PCI_COMMAND_IO) & cmd);
 488
 489         /*
 490          * Turn on auto refresh
 491          * The loop is taken directly from Ramix's example code.  I assume that
 492          * this must be held high for some duration of time, but I can find no
 493          * documentation refrencing the reasons why.
 494          */
 495         for (i = 1; i <= 8; i++) {
 496                 pci_write_config_word(dev, PMC551_SDRAM_CMD, 0x0df);
 497
 498                 /*
 499                  * Make certain command has gone through
 500                  * FIXME: register spinning issue
 501                  */
 502                 counter = 0;
 503                 do {
 504                         pci_read_config_word(dev, PMC551_SDRAM_CMD, &cmd);
 505                         if (counter++ > 100)
 506                                 break;
 507                 } while ((PCI_COMMAND_IO) & cmd);
 508         }
 509
 510         pci_write_config_word(dev, PMC551_SDRAM_MA, 0x0020);
 511         pci_write_config_word(dev, PMC551_SDRAM_CMD, 0x0ff);
 512
 513         /*
 514          * Wait until command completes
 515          * FIXME: register spinning issue
 516          */
 517         counter = 0;
 518         do {
 519                 pci_read_config_word(dev, PMC551_SDRAM_CMD, &cmd);
 520                 if (counter++ > 100)
 521                         break;
 522         } while ((PCI_COMMAND_IO) & cmd);
 523
 524         pci_read_config_dword(dev, PMC551_DRAM_CFG, &dcmd);
 525         dcmd |= 0x02000000;
 526         pci_write_config_dword(dev, PMC551_DRAM_CFG, dcmd);
 527
 528         /*
 529          * Check to make certain fast back-to-back, if not
 530          * then set it so
 531          */
 532         pci_read_config_word(dev, PCI_STATUS, &cmd);
 533         if ((cmd & PCI_COMMAND_FAST_BACK) == 0) {
 534                 cmd |= PCI_COMMAND_FAST_BACK;
 535                 pci_write_config_word(dev, PCI_STATUS, cmd);
 536         }
 537
 538         /*
 539          * Check to make certain the DEVSEL is set correctly, this device
 540          * has a tendancy to assert DEVSEL and TRDY when a write is performed
 541          * to the memory when memory is read-only
 542          */
 543         if ((cmd & PCI_STATUS_DEVSEL_MASK) != 0x0) {
 544                 cmd &= ~PCI_STATUS_DEVSEL_MASK;
 545                 pci_write_config_word(dev, PCI_STATUS, cmd);
 546         }
 547         /*
 548          * Set to be prefetchable and put everything back based on old cfg.
 549          * it's possible that the reset of the V370PDC nuked the original
 550          * setup
 551          */
 552         /*
 553            cfg |= PCI_BASE_ADDRESS_MEM_PREFETCH;
 554            pci_write_config_dword( dev, PCI_BASE_ADDRESS_0, cfg );
 555          */
 556
 557         /*
 558          * Turn PCI memory and I/O bus access back on
 559          */
 560         pci_write_config_word(dev, PCI_COMMAND,
 561                               PCI_COMMAND_MEMORY | PCI_COMMAND_IO);
 562 #ifdef CONFIG_MTD_PMC551_DEBUG
 563         /*
 564          * Some screen fun
 565          */
 566         printk(KERN_DEBUG "pmc551: %d%c (0x%x) of %sprefetchable memory at "
 567                 "0x%llx\n", (size < 1024) ? size : (size < 1048576) ?
 568                 size >> 10 : size >> 20,
 569                 (size < 1024) ? 'B' : (size < 1048576) ? 'K' : 'M', size,
 570                 ((dcmd & (0x1 << 3)) == 0) ? "non-" : "",
 571                 (unsigned long long)pci_resource_start(dev, 0));
 572
 573         /*
 574          * Check to see the state of the memory
 575          */
 576         pci_read_config_dword(dev, PMC551_DRAM_BLK0, &dcmd);
 577         printk(KERN_DEBUG "pmc551: DRAM_BLK0 Flags: %s,%s\n"
 578                 "pmc551: DRAM_BLK0 Size: %d at %d\n"
 579                 "pmc551: DRAM_BLK0 Row MUX: %d, Col MUX: %d\n",
 580                 (((0x1 << 1) & dcmd) == 0) ? "RW" : "RO",
 581                 (((0x1 << 0) & dcmd) == 0) ? "Off" : "On",
 582                 PMC551_DRAM_BLK_GET_SIZE(dcmd),
 583                 ((dcmd >> 20) & 0x7FF), ((dcmd >> 13) & 0x7),
 584                 ((dcmd >> 9) & 0xF));
 585
 586         pci_read_config_dword(dev, PMC551_DRAM_BLK1, &dcmd);
 587         printk(KERN_DEBUG "pmc551: DRAM_BLK1 Flags: %s,%s\n"
 588                 "pmc551: DRAM_BLK1 Size: %d at %d\n"
 589                 "pmc551: DRAM_BLK1 Row MUX: %d, Col MUX: %d\n",
 590                 (((0x1 << 1) & dcmd) == 0) ? "RW" : "RO",
 591                 (((0x1 << 0) & dcmd) == 0) ? "Off" : "On",
 592                 PMC551_DRAM_BLK_GET_SIZE(dcmd),
 593                 ((dcmd >> 20) & 0x7FF), ((dcmd >> 13) & 0x7),
 594                 ((dcmd >> 9) & 0xF));
 595
 596         pci_read_config_dword(dev, PMC551_DRAM_BLK2, &dcmd);
 597         printk(KERN_DEBUG "pmc551: DRAM_BLK2 Flags: %s,%s\n"
 598                 "pmc551: DRAM_BLK2 Size: %d at %d\n"
 599                 "pmc551: DRAM_BLK2 Row MUX: %d, Col MUX: %d\n",
 600                 (((0x1 << 1) & dcmd) == 0) ? "RW" : "RO",
 601                 (((0x1 << 0) & dcmd) == 0) ? "Off" : "On",
 602                 PMC551_DRAM_BLK_GET_SIZE(dcmd),
 603                 ((dcmd >> 20) & 0x7FF), ((dcmd >> 13) & 0x7),
 604                 ((dcmd >> 9) & 0xF));
 605
 606         pci_read_config_dword(dev, PMC551_DRAM_BLK3, &dcmd);
 607         printk(KERN_DEBUG "pmc551: DRAM_BLK3 Flags: %s,%s\n"
 608                 "pmc551: DRAM_BLK3 Size: %d at %d\n"
 609                 "pmc551: DRAM_BLK3 Row MUX: %d, Col MUX: %d\n",
 610                 (((0x1 << 1) & dcmd) == 0) ? "RW" : "RO",
 611                 (((0x1 << 0) & dcmd) == 0) ? "Off" : "On",
 612                 PMC551_DRAM_BLK_GET_SIZE(dcmd),
 613                 ((dcmd >> 20) & 0x7FF), ((dcmd >> 13) & 0x7),
 614                 ((dcmd >> 9) & 0xF));
 615
 616         pci_read_config_word(dev, PCI_COMMAND, &cmd);
 617         printk(KERN_DEBUG "pmc551: Memory Access %s\n",
 618                 (((0x1 << 1) & cmd) == 0) ? "off" : "on");
 619         printk(KERN_DEBUG "pmc551: I/O Access %s\n",
 620                 (((0x1 << 0) & cmd) == 0) ? "off" : "on");
 621
 622         pci_read_config_word(dev, PCI_STATUS, &cmd);
 623         printk(KERN_DEBUG "pmc551: Devsel %s\n",
 624                 ((PCI_STATUS_DEVSEL_MASK & cmd) == 0x000) ? "Fast" :
 625                 ((PCI_STATUS_DEVSEL_MASK & cmd) == 0x200) ? "Medium" :
 626                 ((PCI_STATUS_DEVSEL_MASK & cmd) == 0x400) ? "Slow" : "Invalid");
 627
 628         printk(KERN_DEBUG "pmc551: %sFast Back-to-Back\n",
 629                 ((PCI_COMMAND_FAST_BACK & cmd) == 0) ? "Not " : "");
 630
 631         pci_read_config_byte(dev, PMC551_SYS_CTRL_REG, &bcmd);
 632         printk(KERN_DEBUG "pmc551: EEPROM is under %s control\n"
 633                 "pmc551: System Control Register is %slocked to PCI access\n"
 634                 "pmc551: System Control Register is %slocked to EEPROM access\n",
 635                 (bcmd & 0x1) ? "software" : "hardware",
 636                 (bcmd & 0x20) ? "" : "un", (bcmd & 0x40) ? "" : "un");
 637 #endif
 638         return size;
 639 }
 640
 641 /*
 642  * Kernel version specific module stuffages
 643  */
 644
 645 MODULE_LICENSE("GPL");
 646 MODULE_AUTHOR("Mark Ferrell <mferrell@mvista.com>");
 647 MODULE_DESCRIPTION(PMC551_VERSION);
 648
 649 /*
 650  * Stuff these outside the ifdef so as to not bust compiled in driver support
 651  */
 652 static int msize = 0;
 653 #if defined(CONFIG_MTD_PMC551_APERTURE_SIZE)
 654 static int asize = CONFIG_MTD_PMC551_APERTURE_SIZE
 655 #else
 656 static int asize = 0;
 657 #endif
 658
 659 module_param(msize, int, 0);
 660 MODULE_PARM_DESC(msize, "memory size in Megabytes [1 - 1024]");
 661 module_param(asize, int, 0);
 662 MODULE_PARM_DESC(asize, "aperture size, must be <= memsize [1-1024]");
 663
 664 /*
 665  * PMC551 Card Initialization
 666  */
 667 static int __init init_pmc551(void)
 668 {
 669         struct pci_dev *PCI_Device = NULL;
 670         struct mypriv *priv;
 671         int count, found = 0;
 672         struct mtd_info *mtd;
 673         u32 length = 0;
 674
 675         if (msize) {
 676                 msize = (1 << (ffs(msize) - 1)) << 20;
 677                 if (msize > (1 << 30)) {
 678                         printk(KERN_NOTICE "pmc551: Invalid memory size [%d]\n",
 679                                 msize);
 680                         return -EINVAL;
 681                 }
 682         }
 683
 684         if (asize) {
 685                 asize = (1 << (ffs(asize) - 1)) << 20;
 686                 if (asize > (1 << 30)) {
 687                         printk(KERN_NOTICE "pmc551: Invalid aperture size "
 688                                 "[%d]\n", asize);
 689                         return -EINVAL;
 690                 }
 691         }
 692
 693         printk(KERN_INFO PMC551_VERSION);
 694
 695         /*
 696          * PCU-bus chipset probe.
 697          */
 698         for (count = 0; count < MAX_MTD_DEVICES; count++) {
 699
 700                 if ((PCI_Device = pci_get_device(PCI_VENDOR_ID_V3_SEMI,
 701                                                   PCI_DEVICE_ID_V3_SEMI_V370PDC,
 702                                                   PCI_Device)) == NULL) {
 703                         break;
 704                 }
 705
 706                 printk(KERN_NOTICE "pmc551: Found PCI V370PDC at 0x%llx\n",
 707                         (unsigned long long)pci_resource_start(PCI_Device, 0));
 708
 709                 /*
 710                  * The PMC551 device acts VERY weird if you don't init it
 711                  * first.  i.e. it will not correctly report devsel.  If for
 712                  * some reason the sdram is in a wrote-protected state the
 713                  * device will DEVSEL when it is written to causing problems
 714                  * with the oldproc.c driver in
 715                  * some kernels (2.2.*)
 716                  */
 717                 if ((length = fixup_pmc551(PCI_Device)) <= 0) {
 718                         printk(KERN_NOTICE "pmc551: Cannot init SDRAM\n");
 719                         break;
 720                 }
 721
 722                 /*
 723                  * This is needed until the driver is capable of reading the
 724                  * onboard I2C SROM to discover the "real" memory size.
 725                  */
 726                 if (msize) {
 727                         length = msize;
 728                         printk(KERN_NOTICE "pmc551: Using specified memory "
 729                                 "size 0x%x\n", length);
 730                 } else {
 731                         msize = length;
 732                 }
 733
 734                 mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
 735                 if (!mtd) {
 736                         printk(KERN_NOTICE "pmc551: Cannot allocate new MTD "
 737                                 "device.\n");
 738                         break;
 739                 }
 740
 741                 priv = kzalloc(sizeof(struct mypriv), GFP_KERNEL);
 742                 if (!priv) {
 743                         printk(KERN_NOTICE "pmc551: Cannot allocate new MTD "
 744                                 "device.\n");
 745                         kfree(mtd);
 746                         break;
 747                 }
 748                 mtd->priv = priv;
 749                 priv->dev = PCI_Device;
 750
 751                 if (asize > length) {
 752                         printk(KERN_NOTICE "pmc551: reducing aperture size to "
 753                                 "fit %dM\n", length >> 20);
 754                         priv->asize = asize = length;
 755                 } else if (asize == 0 || asize == length) {
 756                         printk(KERN_NOTICE "pmc551: Using existing aperture "
 757                                 "size %dM\n", length >> 20);
 758                         priv->asize = asize = length;
 759                 } else {
 760                         printk(KERN_NOTICE "pmc551: Using specified aperture "
 761                                 "size %dM\n", asize >> 20);
 762                         priv->asize = asize;
 763                 }
 764                 priv->start = pci_iomap(PCI_Device, 0, priv->asize);
 765
 766                 if (!priv->start) {
 767                         printk(KERN_NOTICE "pmc551: Unable to map IO space\n");
 768                         kfree(mtd->priv);
 769                         kfree(mtd);
 770                         break;
 771                 }
 772 #ifdef CONFIG_MTD_PMC551_DEBUG
 773                 printk(KERN_DEBUG "pmc551: setting aperture to %d\n",
 774                         ffs(priv->asize >> 20) - 1);
 775 #endif
 776
 777                 priv->base_map0 = (PMC551_PCI_MEM_MAP_REG_EN
 778                                    | PMC551_PCI_MEM_MAP_ENABLE
 779                                    | (ffs(priv->asize >> 20) - 1) << 4);
 780                 priv->curr_map0 = priv->base_map0;
 781                 pci_write_config_dword(priv->dev, PMC551_PCI_MEM_MAP0,
 782                                         priv->curr_map0);
 783
 784 #ifdef CONFIG_MTD_PMC551_DEBUG
 785                 printk(KERN_DEBUG "pmc551: aperture set to %d\n",
 786                         (priv->base_map0 & 0xF0) >> 4);
 787 #endif
 788
 789                 mtd->size = msize;
 790                 mtd->flags = MTD_CAP_RAM;
 791                 mtd->erase = pmc551_erase;
 792                 mtd->read = pmc551_read;
 793                 mtd->write = pmc551_write;
 794                 mtd->point = pmc551_point;
 795                 mtd->unpoint = pmc551_unpoint;
 796                 mtd->type = MTD_RAM;
 797                 mtd->name = "PMC551 RAM board";
 798                 mtd->erasesize = 0x10000;
 799                 mtd->writesize = 1;
 800                 mtd->owner = THIS_MODULE;
 801
 802                 if (add_mtd_device(mtd)) {
 803                         printk(KERN_NOTICE "pmc551: Failed to register new "
 804                                 "device\n");
 805                         pci_iounmap(PCI_Device, priv->start);
 806                         kfree(mtd->priv);
 807                         kfree(mtd);
 808                         break;
 809                 }
 810
 811                 /* Keep a reference as the add_mtd_device worked */
 812                 pci_dev_get(PCI_Device);
 813
 814                 printk(KERN_NOTICE "Registered pmc551 memory device.\n");
 815                 printk(KERN_NOTICE "Mapped %dM of memory from 0x%p to 0x%p\n",
 816                         priv->asize >> 20,
 817                         priv->start, priv->start + priv->asize);
 818                 printk(KERN_NOTICE "Total memory is %d%c\n",
 819                         (length < 1024) ? length :
 820                         (length < 1048576) ? length >> 10 : length >> 20,
 821                         (length < 1024) ? 'B' : (length < 1048576) ? 'K' : 'M');
 822                 priv->nextpmc551 = pmc551list;
 823                 pmc551list = mtd;
 824                 found++;
 825         }
 826
 827         /* Exited early, reference left over */
 828         if (PCI_Device)
 829                 pci_dev_put(PCI_Device);
 830
 831         if (!pmc551list) {
 832                 printk(KERN_NOTICE "pmc551: not detected\n");
 833                 return -ENODEV;
 834         } else {
 835                 printk(KERN_NOTICE "pmc551: %d pmc551 devices loaded\n", found);
 836                 return 0;
 837         }
 838 }
 839
 840 /*
 841  * PMC551 Card Cleanup
 842  */
 843 static void __exit cleanup_pmc551(void)
 844 {
 845         int found = 0;
 846         struct mtd_info *mtd;
 847         struct mypriv *priv;
 848
 849         while ((mtd = pmc551list)) {
 850                 priv = mtd->priv;
 851                 pmc551list = priv->nextpmc551;
 852
 853                 if (priv->start) {
 854                         printk(KERN_DEBUG "pmc551: unmapping %dM starting at "
 855                                 "0x%p\n", priv->asize >> 20, priv->start);
 856                         pci_iounmap(priv->dev, priv->start);
 857                 }
 858                 pci_dev_put(priv->dev);
 859
 860                 kfree(mtd->priv);
 861                 del_mtd_device(mtd);
 862                 kfree(mtd);
 863                 found++;
 864         }
 865
 866         printk(KERN_NOTICE "pmc551: %d pmc551 devices unloaded\n", found);
 867 }
 868
 869 module_init(init_pmc551);
 870 module_exit(cleanup_pmc551);