root/drivers/mtd/devices/pmc551.c

DEFINITIONS

1. pmc551_erase
2. pmc551_point
3. pmc551_unpoint
4. pmc551_read
5. pmc551_write
6. fixup_pmc551
7. init_pmc551
8. cleanup_pmc551

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * PMC551 PCI Mezzanine Ram Device
   4  *
   5  * Author:
   6  *      Mark Ferrell <mferrell@mvista.com>
   7  *      Copyright 1999,2000 Nortel Networks
   8  *
   9  * Description:
  10  *      This driver is intended to support the PMC551 PCI Ram device
  11  *      from Ramix Inc.  The PMC551 is a PMC Mezzanine module for
  12  *      cPCI embedded systems.  The device contains a single SROM
  13  *      that initially programs the V370PDC chipset onboard the
  14  *      device, and various banks of DRAM/SDRAM onboard.  This driver
  15  *      implements this PCI Ram device as an MTD (Memory Technology
  16  *      Device) so that it can be used to hold a file system, or for
  17  *      added swap space in embedded systems.  Since the memory on
  18  *      this board isn't as fast as main memory we do not try to hook
  19  *      it into main memory as that would simply reduce performance
  20  *      on the system.  Using it as a block device allows us to use
  21  *      it as high speed swap or for a high speed disk device of some
  22  *      sort.  Which becomes very useful on diskless systems in the
  23  *      embedded market I might add.
  24  *
  25  * Notes:
  26  *      Due to what I assume is more buggy SROM, the 64M PMC551 I
  27  *      have available claims that all 4 of its DRAM banks have 64MiB
  28  *      of ram configured (making a grand total of 256MiB onboard).
  29  *      This is slightly annoying since the BAR0 size reflects the
  30  *      aperture size, not the dram size, and the V370PDC supplies no
  31  *      other method for memory size discovery.  This problem is
  32  *      mostly only relevant when compiled as a module, as the
  33  *      unloading of the module with an aperture size smaller than
  34  *      the ram will cause the driver to detect the onboard memory
  35  *      size to be equal to the aperture size when the module is
  36  *      reloaded.  Soooo, to help, the module supports an msize
  37  *      option to allow the specification of the onboard memory, and
  38  *      an asize option, to allow the specification of the aperture
  39  *      size.  The aperture must be equal to or less then the memory
  40  *      size, the driver will correct this if you screw it up.  This
  41  *      problem is not relevant for compiled in drivers as compiled
  42  *      in drivers only init once.
  43  *
  44  * Credits:
  45  *      Saeed Karamooz <saeed@ramix.com> of Ramix INC. for the
  46  *      initial example code of how to initialize this device and for
  47  *      help with questions I had concerning operation of the device.
  48  *
  49  *      Most of the MTD code for this driver was originally written
  50  *      for the slram.o module in the MTD drivers package which
  51  *      allows the mapping of system memory into an MTD device.
  52  *      Since the PMC551 memory module is accessed in the same
  53  *      fashion as system memory, the slram.c code became a very nice
  54  *      fit to the needs of this driver.  All we added was PCI
  55  *      detection/initialization to the driver and automatically figure
  56  *      out the size via the PCI detection.o, later changes by Corey
  57  *      Minyard set up the card to utilize a 1M sliding apature.
  58  *
  59  *      Corey Minyard <minyard@nortelnetworks.com>
  60  *      * Modified driver to utilize a sliding aperture instead of
  61  *       mapping all memory into kernel space which turned out to
  62  *       be very wasteful.
  63  *      * Located a bug in the SROM's initialization sequence that
  64  *       made the memory unusable, added a fix to code to touch up
  65  *       the DRAM some.
  66  *
  67  * Bugs/FIXMEs:
  68  *      * MUST fix the init function to not spin on a register
  69  *      waiting for it to set .. this does not safely handle busted
  70  *      devices that never reset the register correctly which will
  71  *      cause the system to hang w/ a reboot being the only chance at
  72  *      recover. [sort of fixed, could be better]
  73  *      * Add I2C handling of the SROM so we can read the SROM's information
  74  *      about the aperture size.  This should always accurately reflect the
  75  *      onboard memory size.
  76  *      * Comb the init routine.  It's still a bit cludgy on a few things.
  77  */
  78 
  79 #include <linux/kernel.h>
  80 #include <linux/module.h>
  81 #include <linux/uaccess.h>
  82 #include <linux/types.h>
  83 #include <linux/init.h>
  84 #include <linux/ptrace.h>
  85 #include <linux/slab.h>
  86 #include <linux/string.h>
  87 #include <linux/timer.h>
  88 #include <linux/major.h>
  89 #include <linux/fs.h>
  90 #include <linux/ioctl.h>
  91 #include <asm/io.h>
  92 #include <linux/pci.h>
  93 #include <linux/mtd/mtd.h>
  94 
  95 #define PMC551_VERSION \
  96         "Ramix PMC551 PCI Mezzanine Ram Driver. (C) 1999,2000 Nortel Networks.\n"
  97 
  98 #define PCI_VENDOR_ID_V3_SEMI 0x11b0
  99 #define PCI_DEVICE_ID_V3_SEMI_V370PDC 0x0200
 100 
 101 #define PMC551_PCI_MEM_MAP0 0x50
 102 #define PMC551_PCI_MEM_MAP1 0x54
 103 #define PMC551_PCI_MEM_MAP_MAP_ADDR_MASK 0x3ff00000
 104 #define PMC551_PCI_MEM_MAP_APERTURE_MASK 0x000000f0
 105 #define PMC551_PCI_MEM_MAP_REG_EN 0x00000002
 106 #define PMC551_PCI_MEM_MAP_ENABLE 0x00000001
 107 
 108 #define PMC551_SDRAM_MA  0x60
 109 #define PMC551_SDRAM_CMD 0x62
 110 #define PMC551_DRAM_CFG  0x64
 111 #define PMC551_SYS_CTRL_REG 0x78
 112 
 113 #define PMC551_DRAM_BLK0 0x68
 114 #define PMC551_DRAM_BLK1 0x6c
 115 #define PMC551_DRAM_BLK2 0x70
 116 #define PMC551_DRAM_BLK3 0x74
 117 #define PMC551_DRAM_BLK_GET_SIZE(x) (524288 << ((x >> 4) & 0x0f))
 118 #define PMC551_DRAM_BLK_SET_COL_MUX(x, v) (((x) & ~0x00007000) | (((v) & 0x7) << 12))
 119 #define PMC551_DRAM_BLK_SET_ROW_MUX(x, v) (((x) & ~0x00000f00) | (((v) & 0xf) << 8))
 120 
 121 struct mypriv {
 122         struct pci_dev *dev;
 123         u_char *start;
 124         u32 base_map0;
 125         u32 curr_map0;
 126         u32 asize;
 127         struct mtd_info *nextpmc551;
 128 };
 129 
 130 static struct mtd_info *pmc551list;
 131 
 132 static int pmc551_point(struct mtd_info *mtd, loff_t from, size_t len,
 133                         size_t *retlen, void **virt, resource_size_t *phys);
 134 
 135 static int pmc551_erase(struct mtd_info *mtd, struct erase_info *instr)
 136 {
 137         struct mypriv *priv = mtd->priv;
 138         u32 soff_hi;            /* start address offset hi */
 139         u32 eoff_hi, eoff_lo;   /* end address offset hi/lo */
 140         unsigned long end;
 141         u_char *ptr;
 142         size_t retlen;
 143 
 144 #ifdef CONFIG_MTD_PMC551_DEBUG
 145         printk(KERN_DEBUG "pmc551_erase(pos:%ld, len:%ld)\n", (long)instr->addr,
 146                 (long)instr->len);
 147 #endif
 148 
 149         end = instr->addr + instr->len - 1;
 150         eoff_hi = end & ~(priv->asize - 1);
 151         soff_hi = instr->addr & ~(priv->asize - 1);
 152         eoff_lo = end & (priv->asize - 1);
 153 
 154         pmc551_point(mtd, instr->addr, instr->len, &retlen,
 155                      (void **)&ptr, NULL);
 156 
 157         if (soff_hi == eoff_hi || mtd->size == priv->asize) {
 158                 /* The whole thing fits within one access, so just one shot
 159                    will do it. */
 160                 memset(ptr, 0xff, instr->len);
 161         } else {
 162                 /* We have to do multiple writes to get all the data
 163                    written. */
 164                 while (soff_hi != eoff_hi) {
 165 #ifdef CONFIG_MTD_PMC551_DEBUG
 166                         printk(KERN_DEBUG "pmc551_erase() soff_hi: %ld, "
 167                                 "eoff_hi: %ld\n", (long)soff_hi, (long)eoff_hi);
 168 #endif
 169                         memset(ptr, 0xff, priv->asize);
 170                         if (soff_hi + priv->asize >= mtd->size) {
 171                                 goto out;
 172                         }
 173                         soff_hi += priv->asize;
 174                         pmc551_point(mtd, (priv->base_map0 | soff_hi),
 175                                      priv->asize, &retlen,
 176                                      (void **)&ptr, NULL);
 177                 }
 178                 memset(ptr, 0xff, eoff_lo);
 179         }
 180 
 181       out:
 182 #ifdef CONFIG_MTD_PMC551_DEBUG
 183         printk(KERN_DEBUG "pmc551_erase() done\n");
 184 #endif
 185 
 186         return 0;
 187 }
 188 
 189 static int pmc551_point(struct mtd_info *mtd, loff_t from, size_t len,
 190                         size_t *retlen, void **virt, resource_size_t *phys)
 191 {
 192         struct mypriv *priv = mtd->priv;
 193         u32 soff_hi;
 194         u32 soff_lo;
 195 
 196 #ifdef CONFIG_MTD_PMC551_DEBUG
 197         printk(KERN_DEBUG "pmc551_point(%ld, %ld)\n", (long)from, (long)len);
 198 #endif
 199 
 200         soff_hi = from & ~(priv->asize - 1);
 201         soff_lo = from & (priv->asize - 1);
 202 
 203         /* Cheap hack optimization */
 204         if (priv->curr_map0 != from) {
 205                 pci_write_config_dword(priv->dev, PMC551_PCI_MEM_MAP0,
 206                                         (priv->base_map0 | soff_hi));
 207                 priv->curr_map0 = soff_hi;
 208         }
 209 
 210         *virt = priv->start + soff_lo;
 211         *retlen = len;
 212         return 0;
 213 }
 214 
 215 static int pmc551_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
 216 {
 217 #ifdef CONFIG_MTD_PMC551_DEBUG
 218         printk(KERN_DEBUG "pmc551_unpoint()\n");
 219 #endif
 220         return 0;
 221 }
 222 
 223 static int pmc551_read(struct mtd_info *mtd, loff_t from, size_t len,
 224                         size_t * retlen, u_char * buf)
 225 {
 226         struct mypriv *priv = mtd->priv;
 227         u32 soff_hi;            /* start address offset hi */
 228         u32 eoff_hi, eoff_lo;   /* end address offset hi/lo */
 229         unsigned long end;
 230         u_char *ptr;
 231         u_char *copyto = buf;
 232 
 233 #ifdef CONFIG_MTD_PMC551_DEBUG
 234         printk(KERN_DEBUG "pmc551_read(pos:%ld, len:%ld) asize: %ld\n",
 235                 (long)from, (long)len, (long)priv->asize);
 236 #endif
 237 
 238         end = from + len - 1;
 239         soff_hi = from & ~(priv->asize - 1);
 240         eoff_hi = end & ~(priv->asize - 1);
 241         eoff_lo = end & (priv->asize - 1);
 242 
 243         pmc551_point(mtd, from, len, retlen, (void **)&ptr, NULL);
 244 
 245         if (soff_hi == eoff_hi) {
 246                 /* The whole thing fits within one access, so just one shot
 247                    will do it. */
 248                 memcpy(copyto, ptr, len);
 249                 copyto += len;
 250         } else {
 251                 /* We have to do multiple writes to get all the data
 252                    written. */
 253                 while (soff_hi != eoff_hi) {
 254 #ifdef CONFIG_MTD_PMC551_DEBUG
 255                         printk(KERN_DEBUG "pmc551_read() soff_hi: %ld, "
 256                                 "eoff_hi: %ld\n", (long)soff_hi, (long)eoff_hi);
 257 #endif
 258                         memcpy(copyto, ptr, priv->asize);
 259                         copyto += priv->asize;
 260                         if (soff_hi + priv->asize >= mtd->size) {
 261                                 goto out;
 262                         }
 263                         soff_hi += priv->asize;
 264                         pmc551_point(mtd, soff_hi, priv->asize, retlen,
 265                                      (void **)&ptr, NULL);
 266                 }
 267                 memcpy(copyto, ptr, eoff_lo);
 268                 copyto += eoff_lo;
 269         }
 270 
 271       out:
 272 #ifdef CONFIG_MTD_PMC551_DEBUG
 273         printk(KERN_DEBUG "pmc551_read() done\n");
 274 #endif
 275         *retlen = copyto - buf;
 276         return 0;
 277 }
 278 
 279 static int pmc551_write(struct mtd_info *mtd, loff_t to, size_t len,
 280                         size_t * retlen, const u_char * buf)
 281 {
 282         struct mypriv *priv = mtd->priv;
 283         u32 soff_hi;            /* start address offset hi */
 284         u32 eoff_hi, eoff_lo;   /* end address offset hi/lo */
 285         unsigned long end;
 286         u_char *ptr;
 287         const u_char *copyfrom = buf;
 288 
 289 #ifdef CONFIG_MTD_PMC551_DEBUG
 290         printk(KERN_DEBUG "pmc551_write(pos:%ld, len:%ld) asize:%ld\n",
 291                 (long)to, (long)len, (long)priv->asize);
 292 #endif
 293 
 294         end = to + len - 1;
 295         soff_hi = to & ~(priv->asize - 1);
 296         eoff_hi = end & ~(priv->asize - 1);
 297         eoff_lo = end & (priv->asize - 1);
 298 
 299         pmc551_point(mtd, to, len, retlen, (void **)&ptr, NULL);
 300 
 301         if (soff_hi == eoff_hi) {
 302                 /* The whole thing fits within one access, so just one shot
 303                    will do it. */
 304                 memcpy(ptr, copyfrom, len);
 305                 copyfrom += len;
 306         } else {
 307                 /* We have to do multiple writes to get all the data
 308                    written. */
 309                 while (soff_hi != eoff_hi) {
 310 #ifdef CONFIG_MTD_PMC551_DEBUG
 311                         printk(KERN_DEBUG "pmc551_write() soff_hi: %ld, "
 312                                 "eoff_hi: %ld\n", (long)soff_hi, (long)eoff_hi);
 313 #endif
 314                         memcpy(ptr, copyfrom, priv->asize);
 315                         copyfrom += priv->asize;
 316                         if (soff_hi >= mtd->size) {
 317                                 goto out;
 318                         }
 319                         soff_hi += priv->asize;
 320                         pmc551_point(mtd, soff_hi, priv->asize, retlen,
 321                                      (void **)&ptr, NULL);
 322                 }
 323                 memcpy(ptr, copyfrom, eoff_lo);
 324                 copyfrom += eoff_lo;
 325         }
 326 
 327       out:
 328 #ifdef CONFIG_MTD_PMC551_DEBUG
 329         printk(KERN_DEBUG "pmc551_write() done\n");
 330 #endif
 331         *retlen = copyfrom - buf;
 332         return 0;
 333 }
 334 
 335 /*
 336  * Fixup routines for the V370PDC
 337  * PCI device ID 0x020011b0
 338  *
 339  * This function basically kick starts the DRAM oboard the card and gets it
 340  * ready to be used.  Before this is done the device reads VERY erratic, so
 341  * much that it can crash the Linux 2.2.x series kernels when a user cat's
 342  * /proc/pci .. though that is mainly a kernel bug in handling the PCI DEVSEL
 343  * register.  FIXME: stop spinning on registers .. must implement a timeout
 344  * mechanism
 345  * returns the size of the memory region found.
 346  */
 347 static int __init fixup_pmc551(struct pci_dev *dev)
 348 {
 349 #ifdef CONFIG_MTD_PMC551_BUGFIX
 350         u32 dram_data;
 351 #endif
 352         u32 size, dcmd, cfg, dtmp;
 353         u16 cmd, tmp, i;
 354         u8 bcmd, counter;
 355 
 356         /* Sanity Check */
 357         if (!dev) {
 358                 return -ENODEV;
 359         }
 360 
 361         /*
 362          * Attempt to reset the card
 363          * FIXME: Stop Spinning registers
 364          */
 365         counter = 0;
 366         /* unlock registers */
 367         pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, 0xA5);
 368         /* read in old data */
 369         pci_read_config_byte(dev, PMC551_SYS_CTRL_REG, &bcmd);
 370         /* bang the reset line up and down for a few */
 371         for (i = 0; i < 10; i++) {
 372                 counter = 0;
 373                 bcmd &= ~0x80;
 374                 while (counter++ < 100) {
 375                         pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, bcmd);
 376                 }
 377                 counter = 0;
 378                 bcmd |= 0x80;
 379                 while (counter++ < 100) {
 380                         pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, bcmd);
 381                 }
 382         }
 383         bcmd |= (0x40 | 0x20);
 384         pci_write_config_byte(dev, PMC551_SYS_CTRL_REG, bcmd);
 385 
 386         /*
 387          * Take care and turn off the memory on the device while we
 388          * tweak the configurations
 389          */
 390         pci_read_config_word(dev, PCI_COMMAND, &cmd);
 391         tmp = cmd & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
 392         pci_write_config_word(dev, PCI_COMMAND, tmp);
 393 
 394         /*
 395          * Disable existing aperture before probing memory size
 396          */
 397         pci_read_config_dword(dev, PMC551_PCI_MEM_MAP0, &dcmd);
 398         dtmp = (dcmd | PMC551_PCI_MEM_MAP_ENABLE | PMC551_PCI_MEM_MAP_REG_EN);
 399         pci_write_config_dword(dev, PMC551_PCI_MEM_MAP0, dtmp);
 400         /*
 401          * Grab old BAR0 config so that we can figure out memory size
 402          * This is another bit of kludge going on.  The reason for the
 403          * redundancy is I am hoping to retain the original configuration
 404          * previously assigned to the card by the BIOS or some previous
 405          * fixup routine in the kernel.  So we read the old config into cfg,
 406          * then write all 1's to the memory space, read back the result into
 407          * "size", and then write back all the old config.
 408          */
 409         pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &cfg);
 410 #ifndef CONFIG_MTD_PMC551_BUGFIX
 411         pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, ~0);
 412         pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &size);
 413         size = (size & PCI_BASE_ADDRESS_MEM_MASK);
 414         size &= ~(size - 1);
 415         pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, cfg);
 416 #else
 417         /*
 418          * Get the size of the memory by reading all the DRAM size values
 419          * and adding them up.
 420          *
 421          * KLUDGE ALERT: the boards we are using have invalid column and
 422          * row mux values.  We fix them here, but this will break other
 423          * memory configurations.
 424          */
 425         pci_read_config_dword(dev, PMC551_DRAM_BLK0, &dram_data);
 426         size = PMC551_DRAM_BLK_GET_SIZE(dram_data);
 427         dram_data = PMC551_DRAM_BLK_SET_COL_MUX(dram_data, 0x5);
 428         dram_data = PMC551_DRAM_BLK_SET_ROW_MUX(dram_data, 0x9);
 429         pci_write_config_dword(dev, PMC551_DRAM_BLK0, dram_data);
 430 
 431         pci_read_config_dword(dev, PMC551_DRAM_BLK1, &dram_data);
 432         size += PMC551_DRAM_BLK_GET_SIZE(dram_data);
 433         dram_data = PMC551_DRAM_BLK_SET_COL_MUX(dram_data, 0x5);
 434         dram_data = PMC551_DRAM_BLK_SET_ROW_MUX(dram_data, 0x9);
 435         pci_write_config_dword(dev, PMC551_DRAM_BLK1, dram_data);
 436 
 437         pci_read_config_dword(dev, PMC551_DRAM_BLK2, &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_BLK2, dram_data);
 442 
 443         pci_read_config_dword(dev, PMC551_DRAM_BLK3, &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_BLK3, dram_data);
 448 
 449         /*
 450          * Oops .. something went wrong
 451          */
 452         if ((size &= PCI_BASE_ADDRESS_MEM_MASK) == 0) {
 453                 return -ENODEV;
 454         }
 455 #endif                          /* CONFIG_MTD_PMC551_BUGFIX */
 456 
 457         if ((cfg & PCI_BASE_ADDRESS_SPACE) != PCI_BASE_ADDRESS_SPACE_MEMORY) {
 458                 return -ENODEV;
 459         }
 460 
 461         /*
 462          * Precharge Dram
 463          */
 464         pci_write_config_word(dev, PMC551_SDRAM_MA, 0x0400);
 465         pci_write_config_word(dev, PMC551_SDRAM_CMD, 0x00bf);
 466 
 467         /*
 468          * Wait until command has gone through
 469          * FIXME: register spinning issue
 470          */
 471         do {
 472                 pci_read_config_word(dev, PMC551_SDRAM_CMD, &cmd);
 473                 if (counter++ > 100)
 474                         break;
 475         } while ((PCI_COMMAND_IO) & cmd);
 476 
 477         /*
 478          * Turn on auto refresh
 479          * The loop is taken directly from Ramix's example code.  I assume that
 480          * this must be held high for some duration of time, but I can find no
 481          * documentation refrencing the reasons why.
 482          */
 483         for (i = 1; i <= 8; i++) {
 484                 pci_write_config_word(dev, PMC551_SDRAM_CMD, 0x0df);
 485 
 486                 /*
 487                  * Make certain command has gone through
 488                  * FIXME: register spinning issue
 489                  */
 490                 counter = 0;
 491                 do {
 492                         pci_read_config_word(dev, PMC551_SDRAM_CMD, &cmd);
 493                         if (counter++ > 100)
 494                                 break;
 495                 } while ((PCI_COMMAND_IO) & cmd);
 496         }
 497 
 498         pci_write_config_word(dev, PMC551_SDRAM_MA, 0x0020);
 499         pci_write_config_word(dev, PMC551_SDRAM_CMD, 0x0ff);
 500 
 501         /*
 502          * Wait until command completes
 503          * FIXME: register spinning issue
 504          */
 505         counter = 0;
 506         do {
 507                 pci_read_config_word(dev, PMC551_SDRAM_CMD, &cmd);
 508                 if (counter++ > 100)
 509                         break;
 510         } while ((PCI_COMMAND_IO) & cmd);
 511 
 512         pci_read_config_dword(dev, PMC551_DRAM_CFG, &dcmd);
 513         dcmd |= 0x02000000;
 514         pci_write_config_dword(dev, PMC551_DRAM_CFG, dcmd);
 515 
 516         /*
 517          * Check to make certain fast back-to-back, if not
 518          * then set it so
 519          */
 520         pci_read_config_word(dev, PCI_STATUS, &cmd);
 521         if ((cmd & PCI_COMMAND_FAST_BACK) == 0) {
 522                 cmd |= PCI_COMMAND_FAST_BACK;
 523                 pci_write_config_word(dev, PCI_STATUS, cmd);
 524         }
 525 
 526         /*
 527          * Check to make certain the DEVSEL is set correctly, this device
 528          * has a tendency to assert DEVSEL and TRDY when a write is performed
 529          * to the memory when memory is read-only
 530          */
 531         if ((cmd & PCI_STATUS_DEVSEL_MASK) != 0x0) {
 532                 cmd &= ~PCI_STATUS_DEVSEL_MASK;
 533                 pci_write_config_word(dev, PCI_STATUS, cmd);
 534         }
 535         /*
 536          * Set to be prefetchable and put everything back based on old cfg.
 537          * it's possible that the reset of the V370PDC nuked the original
 538          * setup
 539          */
 540         /*
 541            cfg |= PCI_BASE_ADDRESS_MEM_PREFETCH;
 542            pci_write_config_dword( dev, PCI_BASE_ADDRESS_0, cfg );
 543          */
 544 
 545         /*
 546          * Turn PCI memory and I/O bus access back on
 547          */
 548         pci_write_config_word(dev, PCI_COMMAND,
 549                               PCI_COMMAND_MEMORY | PCI_COMMAND_IO);
 550 #ifdef CONFIG_MTD_PMC551_DEBUG
 551         /*
 552          * Some screen fun
 553          */
 554         printk(KERN_DEBUG "pmc551: %d%sB (0x%x) of %sprefetchable memory at "
 555                 "0x%llx\n", (size < 1024) ? size : (size < 1048576) ?
 556                 size >> 10 : size >> 20,
 557                 (size < 1024) ? "" : (size < 1048576) ? "Ki" : "Mi", size,
 558                 ((dcmd & (0x1 << 3)) == 0) ? "non-" : "",
 559                 (unsigned long long)pci_resource_start(dev, 0));
 560 
 561         /*
 562          * Check to see the state of the memory
 563          */
 564         pci_read_config_dword(dev, PMC551_DRAM_BLK0, &dcmd);
 565         printk(KERN_DEBUG "pmc551: DRAM_BLK0 Flags: %s,%s\n"
 566                 "pmc551: DRAM_BLK0 Size: %d at %d\n"
 567                 "pmc551: DRAM_BLK0 Row MUX: %d, Col MUX: %d\n",
 568                 (((0x1 << 1) & dcmd) == 0) ? "RW" : "RO",
 569                 (((0x1 << 0) & dcmd) == 0) ? "Off" : "On",
 570                 PMC551_DRAM_BLK_GET_SIZE(dcmd),
 571                 ((dcmd >> 20) & 0x7FF), ((dcmd >> 13) & 0x7),
 572                 ((dcmd >> 9) & 0xF));
 573 
 574         pci_read_config_dword(dev, PMC551_DRAM_BLK1, &dcmd);
 575         printk(KERN_DEBUG "pmc551: DRAM_BLK1 Flags: %s,%s\n"
 576                 "pmc551: DRAM_BLK1 Size: %d at %d\n"
 577                 "pmc551: DRAM_BLK1 Row MUX: %d, Col MUX: %d\n",
 578                 (((0x1 << 1) & dcmd) == 0) ? "RW" : "RO",
 579                 (((0x1 << 0) & dcmd) == 0) ? "Off" : "On",
 580                 PMC551_DRAM_BLK_GET_SIZE(dcmd),
 581                 ((dcmd >> 20) & 0x7FF), ((dcmd >> 13) & 0x7),
 582                 ((dcmd >> 9) & 0xF));
 583 
 584         pci_read_config_dword(dev, PMC551_DRAM_BLK2, &dcmd);
 585         printk(KERN_DEBUG "pmc551: DRAM_BLK2 Flags: %s,%s\n"
 586                 "pmc551: DRAM_BLK2 Size: %d at %d\n"
 587                 "pmc551: DRAM_BLK2 Row MUX: %d, Col MUX: %d\n",
 588                 (((0x1 << 1) & dcmd) == 0) ? "RW" : "RO",
 589                 (((0x1 << 0) & dcmd) == 0) ? "Off" : "On",
 590                 PMC551_DRAM_BLK_GET_SIZE(dcmd),
 591                 ((dcmd >> 20) & 0x7FF), ((dcmd >> 13) & 0x7),
 592                 ((dcmd >> 9) & 0xF));
 593 
 594         pci_read_config_dword(dev, PMC551_DRAM_BLK3, &dcmd);
 595         printk(KERN_DEBUG "pmc551: DRAM_BLK3 Flags: %s,%s\n"
 596                 "pmc551: DRAM_BLK3 Size: %d at %d\n"
 597                 "pmc551: DRAM_BLK3 Row MUX: %d, Col MUX: %d\n",
 598                 (((0x1 << 1) & dcmd) == 0) ? "RW" : "RO",
 599                 (((0x1 << 0) & dcmd) == 0) ? "Off" : "On",
 600                 PMC551_DRAM_BLK_GET_SIZE(dcmd),
 601                 ((dcmd >> 20) & 0x7FF), ((dcmd >> 13) & 0x7),
 602                 ((dcmd >> 9) & 0xF));
 603 
 604         pci_read_config_word(dev, PCI_COMMAND, &cmd);
 605         printk(KERN_DEBUG "pmc551: Memory Access %s\n",
 606                 (((0x1 << 1) & cmd) == 0) ? "off" : "on");
 607         printk(KERN_DEBUG "pmc551: I/O Access %s\n",
 608                 (((0x1 << 0) & cmd) == 0) ? "off" : "on");
 609 
 610         pci_read_config_word(dev, PCI_STATUS, &cmd);
 611         printk(KERN_DEBUG "pmc551: Devsel %s\n",
 612                 ((PCI_STATUS_DEVSEL_MASK & cmd) == 0x000) ? "Fast" :
 613                 ((PCI_STATUS_DEVSEL_MASK & cmd) == 0x200) ? "Medium" :
 614                 ((PCI_STATUS_DEVSEL_MASK & cmd) == 0x400) ? "Slow" : "Invalid");
 615 
 616         printk(KERN_DEBUG "pmc551: %sFast Back-to-Back\n",
 617                 ((PCI_COMMAND_FAST_BACK & cmd) == 0) ? "Not " : "");
 618 
 619         pci_read_config_byte(dev, PMC551_SYS_CTRL_REG, &bcmd);
 620         printk(KERN_DEBUG "pmc551: EEPROM is under %s control\n"
 621                 "pmc551: System Control Register is %slocked to PCI access\n"
 622                 "pmc551: System Control Register is %slocked to EEPROM access\n",
 623                 (bcmd & 0x1) ? "software" : "hardware",
 624                 (bcmd & 0x20) ? "" : "un", (bcmd & 0x40) ? "" : "un");
 625 #endif
 626         return size;
 627 }
 628 
 629 /*
 630  * Kernel version specific module stuffages
 631  */
 632 
 633 MODULE_LICENSE("GPL");
 634 MODULE_AUTHOR("Mark Ferrell <mferrell@mvista.com>");
 635 MODULE_DESCRIPTION(PMC551_VERSION);
 636 
 637 /*
 638  * Stuff these outside the ifdef so as to not bust compiled in driver support
 639  */
 640 static int msize = 0;
 641 static int asize = 0;
 642 
 643 module_param(msize, int, 0);
 644 MODULE_PARM_DESC(msize, "memory size in MiB [1 - 1024]");
 645 module_param(asize, int, 0);
 646 MODULE_PARM_DESC(asize, "aperture size, must be <= memsize [1-1024]");
 647 
 648 /*
 649  * PMC551 Card Initialization
 650  */
 651 static int __init init_pmc551(void)
 652 {
 653         struct pci_dev *PCI_Device = NULL;
 654         struct mypriv *priv;
 655         int found = 0;
 656         struct mtd_info *mtd;
 657         int length = 0;
 658 
 659         if (msize) {
 660                 msize = (1 << (ffs(msize) - 1)) << 20;
 661                 if (msize > (1 << 30)) {
 662                         printk(KERN_NOTICE "pmc551: Invalid memory size [%d]\n",
 663                                 msize);
 664                         return -EINVAL;
 665                 }
 666         }
 667 
 668         if (asize) {
 669                 asize = (1 << (ffs(asize) - 1)) << 20;
 670                 if (asize > (1 << 30)) {
 671                         printk(KERN_NOTICE "pmc551: Invalid aperture size "
 672                                 "[%d]\n", asize);
 673                         return -EINVAL;
 674                 }
 675         }
 676 
 677         printk(KERN_INFO PMC551_VERSION);
 678 
 679         /*
 680          * PCU-bus chipset probe.
 681          */
 682         for (;;) {
 683 
 684                 if ((PCI_Device = pci_get_device(PCI_VENDOR_ID_V3_SEMI,
 685                                                   PCI_DEVICE_ID_V3_SEMI_V370PDC,
 686                                                   PCI_Device)) == NULL) {
 687                         break;
 688                 }
 689 
 690                 printk(KERN_NOTICE "pmc551: Found PCI V370PDC at 0x%llx\n",
 691                         (unsigned long long)pci_resource_start(PCI_Device, 0));
 692 
 693                 /*
 694                  * The PMC551 device acts VERY weird if you don't init it
 695                  * first.  i.e. it will not correctly report devsel.  If for
 696                  * some reason the sdram is in a wrote-protected state the
 697                  * device will DEVSEL when it is written to causing problems
 698                  * with the oldproc.c driver in
 699                  * some kernels (2.2.*)
 700                  */
 701                 if ((length = fixup_pmc551(PCI_Device)) <= 0) {
 702                         printk(KERN_NOTICE "pmc551: Cannot init SDRAM\n");
 703                         break;
 704                 }
 705 
 706                 /*
 707                  * This is needed until the driver is capable of reading the
 708                  * onboard I2C SROM to discover the "real" memory size.
 709                  */
 710                 if (msize) {
 711                         length = msize;
 712                         printk(KERN_NOTICE "pmc551: Using specified memory "
 713                                 "size 0x%x\n", length);
 714                 } else {
 715                         msize = length;
 716                 }
 717 
 718                 mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
 719                 if (!mtd)
 720                         break;
 721 
 722                 priv = kzalloc(sizeof(struct mypriv), GFP_KERNEL);
 723                 if (!priv) {
 724                         kfree(mtd);
 725                         break;
 726                 }
 727                 mtd->priv = priv;
 728                 priv->dev = PCI_Device;
 729 
 730                 if (asize > length) {
 731                         printk(KERN_NOTICE "pmc551: reducing aperture size to "
 732                                 "fit %dM\n", length >> 20);
 733                         priv->asize = asize = length;
 734                 } else if (asize == 0 || asize == length) {
 735                         printk(KERN_NOTICE "pmc551: Using existing aperture "
 736                                 "size %dM\n", length >> 20);
 737                         priv->asize = asize = length;
 738                 } else {
 739                         printk(KERN_NOTICE "pmc551: Using specified aperture "
 740                                 "size %dM\n", asize >> 20);
 741                         priv->asize = asize;
 742                 }
 743                 priv->start = pci_iomap(PCI_Device, 0, priv->asize);
 744 
 745                 if (!priv->start) {
 746                         printk(KERN_NOTICE "pmc551: Unable to map IO space\n");
 747                         kfree(mtd->priv);
 748                         kfree(mtd);
 749                         break;
 750                 }
 751 #ifdef CONFIG_MTD_PMC551_DEBUG
 752                 printk(KERN_DEBUG "pmc551: setting aperture to %d\n",
 753                         ffs(priv->asize >> 20) - 1);
 754 #endif
 755 
 756                 priv->base_map0 = (PMC551_PCI_MEM_MAP_REG_EN
 757                                    | PMC551_PCI_MEM_MAP_ENABLE
 758                                    | (ffs(priv->asize >> 20) - 1) << 4);
 759                 priv->curr_map0 = priv->base_map0;
 760                 pci_write_config_dword(priv->dev, PMC551_PCI_MEM_MAP0,
 761                                         priv->curr_map0);
 762 
 763 #ifdef CONFIG_MTD_PMC551_DEBUG
 764                 printk(KERN_DEBUG "pmc551: aperture set to %d\n",
 765                         (priv->base_map0 & 0xF0) >> 4);
 766 #endif
 767 
 768                 mtd->size = msize;
 769                 mtd->flags = MTD_CAP_RAM;
 770                 mtd->_erase = pmc551_erase;
 771                 mtd->_read = pmc551_read;
 772                 mtd->_write = pmc551_write;
 773                 mtd->_point = pmc551_point;
 774                 mtd->_unpoint = pmc551_unpoint;
 775                 mtd->type = MTD_RAM;
 776                 mtd->name = "PMC551 RAM board";
 777                 mtd->erasesize = 0x10000;
 778                 mtd->writesize = 1;
 779                 mtd->owner = THIS_MODULE;
 780 
 781                 if (mtd_device_register(mtd, NULL, 0)) {
 782                         printk(KERN_NOTICE "pmc551: Failed to register new device\n");
 783                         pci_iounmap(PCI_Device, priv->start);
 784                         kfree(mtd->priv);
 785                         kfree(mtd);
 786                         break;
 787                 }
 788 
 789                 /* Keep a reference as the mtd_device_register worked */
 790                 pci_dev_get(PCI_Device);
 791 
 792                 printk(KERN_NOTICE "Registered pmc551 memory device.\n");
 793                 printk(KERN_NOTICE "Mapped %dMiB of memory from 0x%p to 0x%p\n",
 794                         priv->asize >> 20,
 795                         priv->start, priv->start + priv->asize);
 796                 printk(KERN_NOTICE "Total memory is %d%sB\n",
 797                         (length < 1024) ? length :
 798                         (length < 1048576) ? length >> 10 : length >> 20,
 799                         (length < 1024) ? "" : (length < 1048576) ? "Ki" : "Mi");
 800                 priv->nextpmc551 = pmc551list;
 801                 pmc551list = mtd;
 802                 found++;
 803         }
 804 
 805         /* Exited early, reference left over */
 806         pci_dev_put(PCI_Device);
 807 
 808         if (!pmc551list) {
 809                 printk(KERN_NOTICE "pmc551: not detected\n");
 810                 return -ENODEV;
 811         } else {
 812                 printk(KERN_NOTICE "pmc551: %d pmc551 devices loaded\n", found);
 813                 return 0;
 814         }
 815 }
 816 
 817 /*
 818  * PMC551 Card Cleanup
 819  */
 820 static void __exit cleanup_pmc551(void)
 821 {
 822         int found = 0;
 823         struct mtd_info *mtd;
 824         struct mypriv *priv;
 825 
 826         while ((mtd = pmc551list)) {
 827                 priv = mtd->priv;
 828                 pmc551list = priv->nextpmc551;
 829 
 830                 if (priv->start) {
 831                         printk(KERN_DEBUG "pmc551: unmapping %dMiB starting at "
 832                                 "0x%p\n", priv->asize >> 20, priv->start);
 833                         pci_iounmap(priv->dev, priv->start);
 834                 }
 835                 pci_dev_put(priv->dev);
 836 
 837                 kfree(mtd->priv);
 838                 mtd_device_unregister(mtd);
 839                 kfree(mtd);
 840                 found++;
 841         }
 842 
 843         printk(KERN_NOTICE "pmc551: %d pmc551 devices unloaded\n", found);
 844 }
 845 
 846 module_init(init_pmc551);
 847 module_exit(cleanup_pmc551);