SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/message/i2o/pci.c

   1 /*
   2  *      PCI handling of I2O controller
   3  *
   4  *      Copyright (C) 1999-2002 Red Hat Software
   5  *
   6  *      Written by Alan Cox, Building Number Three Ltd
   7  *
   8  *      This program is free software; you can redistribute it and/or modify it
   9  *      under the terms of the GNU General Public License as published by the
  10  *      Free Software Foundation; either version 2 of the License, or (at your
  11  *      option) any later version.
  12  *
  13  *      A lot of the I2O message side code from this is taken from the Red
  14  *      Creek RCPCI45 adapter driver by Red Creek Communications
  15  *
  16  *      Fixes/additions:
  17  *              Philipp Rumpf
  18  *              Juha Sievänen <Juha.Sievanen@cs.Helsinki.FI>
  19  *              Auvo Häkkinen <Auvo.Hakkinen@cs.Helsinki.FI>
  20  *              Deepak Saxena <deepak@plexity.net>
  21  *              Boji T Kannanthanam <boji.t.kannanthanam@intel.com>
  22  *              Alan Cox <alan@redhat.com>:
  23  *                      Ported to Linux 2.5.
  24  *              Markus Lidel <Markus.Lidel@shadowconnect.com>:
  25  *                      Minor fixes for 2.6.
  26  *              Markus Lidel <Markus.Lidel@shadowconnect.com>:
  27  *                      Support for sysfs included.
  28  */
  29
  30 #include <linux/pci.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/i2o.h>
  33
  34 /* Module internal functions from other sources */
  35 extern struct i2o_controller *i2o_iop_alloc(void);
  36 extern void i2o_iop_free(struct i2o_controller *);
  37
  38 extern int i2o_iop_add(struct i2o_controller *);
  39 extern void i2o_iop_remove(struct i2o_controller *);
  40
  41 extern int i2o_driver_dispatch(struct i2o_controller *, u32);
  42
  43 /* PCI device id table for all I2O controllers */
  44 static struct pci_device_id __devinitdata i2o_pci_ids[] = {
  45         {PCI_DEVICE_CLASS(PCI_CLASS_INTELLIGENT_I2O << 8, 0xffff00)},
  46         {PCI_DEVICE(PCI_VENDOR_ID_DPT, 0xa511)},
  47         {.vendor = PCI_VENDOR_ID_INTEL,.device = 0x1962,
  48          .subvendor = PCI_VENDOR_ID_PROMISE,.subdevice = PCI_ANY_ID},
  49         {0}
  50 };
  51
  52 /**
  53  *      i2o_pci_free - Frees the DMA memory for the I2O controller
  54  *      @c: I2O controller to free
  55  *
  56  *      Remove all allocated DMA memory and unmap memory IO regions. If MTRR
  57  *      is enabled, also remove it again.
  58  */
  59 static void i2o_pci_free(struct i2o_controller *c)
  60 {
  61         struct device *dev;
  62
  63         dev = &c->pdev->dev;
  64
  65         i2o_dma_free(dev, &c->out_queue);
  66         i2o_dma_free(dev, &c->status_block);
  67         kfree(c->lct);
  68         i2o_dma_free(dev, &c->dlct);
  69         i2o_dma_free(dev, &c->hrt);
  70         i2o_dma_free(dev, &c->status);
  71
  72         if (c->raptor && c->in_queue.virt)
  73                 iounmap(c->in_queue.virt);
  74
  75         if (c->base.virt)
  76                 iounmap(c->base.virt);
  77 }
  78
  79 /**
  80  *      i2o_pci_alloc - Allocate DMA memory, map IO memory for I2O controller
  81  *      @c: I2O controller
  82  *
  83  *      Allocate DMA memory for a PCI (or in theory AGP) I2O controller. All
  84  *      IO mappings are also done here. If MTRR is enabled, also do add memory
  85  *      regions here.
  86  *
  87  *      Returns 0 on success or negative error code on failure.
  88  */
  89 static int __devinit i2o_pci_alloc(struct i2o_controller *c)
  90 {
  91         struct pci_dev *pdev = c->pdev;
  92         struct device *dev = &pdev->dev;
  93         int i;
  94
  95         for (i = 0; i < 6; i++) {
  96                 /* Skip I/O spaces */
  97                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
  98                         if (!c->base.phys) {
  99                                 c->base.phys = pci_resource_start(pdev, i);
 100                                 c->base.len = pci_resource_len(pdev, i);
 101
 102                                 /*
 103                                  * If we know what card it is, set the size
 104                                  * correctly. Code is taken from dpt_i2o.c
 105                                  */
 106                                 if (pdev->device == 0xa501) {
 107                                         if (pdev->subsystem_device >= 0xc032 &&
 108                                             pdev->subsystem_device <= 0xc03b) {
 109                                                 if (c->base.len > 0x400000)
 110                                                         c->base.len = 0x400000;
 111                                         } else {
 112                                                 if (c->base.len > 0x100000)
 113                                                         c->base.len = 0x100000;
 114                                         }
 115                                 }
 116                                 if (!c->raptor)
 117                                         break;
 118                         } else {
 119                                 c->in_queue.phys = pci_resource_start(pdev, i);
 120                                 c->in_queue.len = pci_resource_len(pdev, i);
 121                                 break;
 122                         }
 123                 }
 124         }
 125
 126         if (i == 6) {
 127                 printk(KERN_ERR "%s: I2O controller has no memory regions"
 128                        " defined.\n", c->name);
 129                 i2o_pci_free(c);
 130                 return -EINVAL;
 131         }
 132
 133         /* Map the I2O controller */
 134         if (c->raptor) {
 135                 printk(KERN_INFO "%s: PCI I2O controller\n", c->name);
 136                 printk(KERN_INFO "     BAR0 at 0x%08lX size=%ld\n",
 137                        (unsigned long)c->base.phys, (unsigned long)c->base.len);
 138                 printk(KERN_INFO "     BAR1 at 0x%08lX size=%ld\n",
 139                        (unsigned long)c->in_queue.phys,
 140                        (unsigned long)c->in_queue.len);
 141         } else
 142                 printk(KERN_INFO "%s: PCI I2O controller at %08lX size=%ld\n",
 143                        c->name, (unsigned long)c->base.phys,
 144                        (unsigned long)c->base.len);
 145
 146         c->base.virt = ioremap_nocache(c->base.phys, c->base.len);
 147         if (!c->base.virt) {
 148                 printk(KERN_ERR "%s: Unable to map controller.\n", c->name);
 149                 return -ENOMEM;
 150         }
 151
 152         if (c->raptor) {
 153                 c->in_queue.virt =
 154                     ioremap_nocache(c->in_queue.phys, c->in_queue.len);
 155                 if (!c->in_queue.virt) {
 156                         printk(KERN_ERR "%s: Unable to map controller.\n",
 157                                c->name);
 158                         i2o_pci_free(c);
 159                         return -ENOMEM;
 160                 }
 161         } else
 162                 c->in_queue = c->base;
 163
 164         c->irq_status = c->base.virt + I2O_IRQ_STATUS;
 165         c->irq_mask = c->base.virt + I2O_IRQ_MASK;
 166         c->in_port = c->base.virt + I2O_IN_PORT;
 167         c->out_port = c->base.virt + I2O_OUT_PORT;
 168
 169         if (i2o_dma_alloc(dev, &c->status, 8, GFP_KERNEL)) {
 170                 i2o_pci_free(c);
 171                 return -ENOMEM;
 172         }
 173
 174         if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt), GFP_KERNEL)) {
 175                 i2o_pci_free(c);
 176                 return -ENOMEM;
 177         }
 178
 179         if (i2o_dma_alloc(dev, &c->dlct, 8192, GFP_KERNEL)) {
 180                 i2o_pci_free(c);
 181                 return -ENOMEM;
 182         }
 183
 184         if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block),
 185                           GFP_KERNEL)) {
 186                 i2o_pci_free(c);
 187                 return -ENOMEM;
 188         }
 189
 190         if (i2o_dma_alloc(dev, &c->out_queue, MSG_POOL_SIZE, GFP_KERNEL)) {
 191                 i2o_pci_free(c);
 192                 return -ENOMEM;
 193         }
 194
 195         pci_set_drvdata(pdev, c);
 196
 197         return 0;
 198 }
 199
 200 /**
 201  *      i2o_pci_interrupt - Interrupt handler for I2O controller
 202  *      @irq: interrupt line
 203  *      @dev_id: pointer to the I2O controller
 204  *      @r: pointer to registers
 205  *
 206  *      Handle an interrupt from a PCI based I2O controller. This turns out
 207  *      to be rather simple. We keep the controller pointer in the cookie.
 208  */
 209 static irqreturn_t i2o_pci_interrupt(int irq, void *dev_id, struct pt_regs *r)
 210 {
 211         struct i2o_controller *c = dev_id;
 212         u32 m;
 213         irqreturn_t rc = IRQ_NONE;
 214
 215         while (readl(c->irq_status) & I2O_IRQ_OUTBOUND_POST) {
 216                 m = readl(c->out_port);
 217                 if (m == I2O_QUEUE_EMPTY) {
 218                         /*
 219                          * Old 960 steppings had a bug in the I2O unit that
 220                          * caused the queue to appear empty when it wasn't.
 221                          */
 222                         m = readl(c->out_port);
 223                         if (unlikely(m == I2O_QUEUE_EMPTY))
 224                                 break;
 225                 }
 226
 227                 /* dispatch it */
 228                 if (i2o_driver_dispatch(c, m))
 229                         /* flush it if result != 0 */
 230                         i2o_flush_reply(c, m);
 231
 232                 rc = IRQ_HANDLED;
 233         }
 234
 235         return rc;
 236 }
 237
 238 /**
 239  *      i2o_pci_irq_enable - Allocate interrupt for I2O controller
 240  *
 241  *      Allocate an interrupt for the I2O controller, and activate interrupts
 242  *      on the I2O controller.
 243  *
 244  *      Returns 0 on success or negative error code on failure.
 245  */
 246 static int i2o_pci_irq_enable(struct i2o_controller *c)
 247 {
 248         struct pci_dev *pdev = c->pdev;
 249         int rc;
 250
 251         wmb();
 252         writel(0xffffffff, c->irq_mask);
 253         wmb();
 254
 255         if (pdev->irq) {
 256                 rc = request_irq(pdev->irq, i2o_pci_interrupt, SA_SHIRQ,
 257                                  c->name, c);
 258                 if (rc < 0) {
 259                         printk(KERN_ERR "%s: unable to allocate interrupt %d."
 260                                "\n", c->name, pdev->irq);
 261                         return rc;
 262                 }
 263         }
 264
 265         writel(0x00000000, c->irq_mask);
 266         wmb();
 267
 268         printk(KERN_INFO "%s: Installed at IRQ %d\n", c->name, pdev->irq);
 269
 270         return 0;
 271 }
 272
 273 /**
 274  *      i2o_pci_irq_disable - Free interrupt for I2O controller
 275  *      @c: I2O controller
 276  *
 277  *      Disable interrupts in I2O controller and then free interrupt.
 278  */
 279 static void i2o_pci_irq_disable(struct i2o_controller *c)
 280 {
 281         wmb();
 282         writel(0xffffffff, c->irq_mask);
 283         wmb();
 284
 285         if (c->pdev->irq > 0)
 286                 free_irq(c->pdev->irq, c);
 287 }
 288
 289 /**
 290  *      i2o_pci_probe - Probe the PCI device for an I2O controller
 291  *      @dev: PCI device to test
 292  *      @id: id which matched with the PCI device id table
 293  *
 294  *      Probe the PCI device for any device which is a memory of the
 295  *      Intelligent, I2O class or an Adaptec Zero Channel Controller. We
 296  *      attempt to set up each such device and register it with the core.
 297  *
 298  *      Returns 0 on success or negative error code on failure.
 299  */
 300 static int __devinit i2o_pci_probe(struct pci_dev *pdev,
 301                                    const struct pci_device_id *id)
 302 {
 303         struct i2o_controller *c;
 304         int rc;
 305         struct pci_dev *i960 = NULL;
 306
 307         printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n");
 308
 309         if ((pdev->class & 0xff) > 1) {
 310                 printk(KERN_WARNING "i2o: %s does not support I2O 1.5 "
 311                        "(skipping).\n", pci_name(pdev));
 312                 return -ENODEV;
 313         }
 314
 315         if ((rc = pci_enable_device(pdev))) {
 316                 printk(KERN_WARNING "i2o: couldn't enable device %s\n",
 317                        pci_name(pdev));
 318                 return rc;
 319         }
 320
 321         if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
 322                 printk(KERN_WARNING "i2o: no suitable DMA found for %s\n",
 323                        pci_name(pdev));
 324                 rc = -ENODEV;
 325                 goto disable;
 326         }
 327
 328         pci_set_master(pdev);
 329
 330         c = i2o_iop_alloc();
 331         if (IS_ERR(c)) {
 332                 printk(KERN_ERR "i2o: couldn't allocate memory for %s\n",
 333                        pci_name(pdev));
 334                 rc = PTR_ERR(c);
 335                 goto disable;
 336         } else
 337                 printk(KERN_INFO "%s: controller found (%s)\n", c->name,
 338                        pci_name(pdev));
 339
 340         c->pdev = pdev;
 341         c->device.parent = get_device(&pdev->dev);
 342
 343         /* Cards that fall apart if you hit them with large I/O loads... */
 344         if (pdev->vendor == PCI_VENDOR_ID_NCR && pdev->device == 0x0630) {
 345                 c->short_req = 1;
 346                 printk(KERN_INFO "%s: Symbios FC920 workarounds activated.\n",
 347                        c->name);
 348         }
 349
 350         if (pdev->subsystem_vendor == PCI_VENDOR_ID_PROMISE) {
 351                 /*
 352                  * Expose the ship behind i960 for initialization, or it will
 353                  * failed
 354                  */
 355                 i960 =
 356                     pci_find_slot(c->pdev->bus->number,
 357                                   PCI_DEVFN(PCI_SLOT(c->pdev->devfn), 0));
 358
 359                 if (i960)
 360                         pci_write_config_word(i960, 0x42, 0);
 361
 362                 c->promise = 1;
 363         }
 364
 365         if (pdev->subsystem_vendor == PCI_VENDOR_ID_DPT)
 366                 c->adaptec = 1;
 367
 368         /* Cards that go bananas if you quiesce them before you reset them. */
 369         if (pdev->vendor == PCI_VENDOR_ID_DPT) {
 370                 c->no_quiesce = 1;
 371                 if (pdev->device == 0xa511)
 372                         c->raptor = 1;
 373
 374                 if (pdev->subsystem_device == 0xc05a) {
 375                         c->limit_sectors = 1;
 376                         printk(KERN_INFO
 377                                "%s: limit sectors per request to %d\n", c->name,
 378                                I2O_MAX_SECTORS_LIMITED);
 379                 }
 380 #ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
 381                 if (sizeof(dma_addr_t) > 4) {
 382                         if (pci_set_dma_mask(pdev, DMA_64BIT_MASK))
 383                                 printk(KERN_INFO "%s: 64-bit DMA unavailable\n",
 384                                        c->name);
 385                         else {
 386                                 c->pae_support = 1;
 387                                 printk(KERN_INFO "%s: using 64-bit DMA\n",
 388                                        c->name);
 389                         }
 390                 }
 391 #endif
 392         }
 393
 394         if ((rc = i2o_pci_alloc(c))) {
 395                 printk(KERN_ERR "%s: DMA / IO allocation for I2O controller "
 396                        " failed\n", c->name);
 397                 goto free_controller;
 398         }
 399
 400         if (i2o_pci_irq_enable(c)) {
 401                 printk(KERN_ERR "%s: unable to enable interrupts for I2O "
 402                        "controller\n", c->name);
 403                 goto free_pci;
 404         }
 405
 406         if ((rc = i2o_iop_add(c)))
 407                 goto uninstall;
 408
 409         if (i960)
 410                 pci_write_config_word(i960, 0x42, 0x03ff);
 411
 412         get_device(&c->device);
 413
 414         return 0;
 415
 416       uninstall:
 417         i2o_pci_irq_disable(c);
 418
 419       free_pci:
 420         i2o_pci_free(c);
 421
 422       free_controller:
 423         i2o_iop_free(c);
 424         put_device(c->device.parent);
 425
 426       disable:
 427         pci_disable_device(pdev);
 428
 429         return rc;
 430 }
 431
 432 /**
 433  *      i2o_pci_remove - Removes a I2O controller from the system
 434  *      pdev: I2O controller which should be removed
 435  *
 436  *      Reset the I2O controller, disable interrupts and remove all allocated
 437  *      resources.
 438  */
 439 static void __devexit i2o_pci_remove(struct pci_dev *pdev)
 440 {
 441         struct i2o_controller *c;
 442         c = pci_get_drvdata(pdev);
 443
 444         i2o_iop_remove(c);
 445         i2o_pci_irq_disable(c);
 446         i2o_pci_free(c);
 447
 448         pci_disable_device(pdev);
 449
 450         printk(KERN_INFO "%s: Controller removed.\n", c->name);
 451
 452         put_device(c->device.parent);
 453         put_device(&c->device);
 454 };
 455
 456 /* PCI driver for I2O controller */
 457 static struct pci_driver i2o_pci_driver = {
 458         .name = "PCI_I2O",
 459         .id_table = i2o_pci_ids,
 460         .probe = i2o_pci_probe,
 461         .remove = __devexit_p(i2o_pci_remove),
 462 };
 463
 464 /**
 465  *      i2o_pci_init - registers I2O PCI driver in PCI subsystem
 466  *
 467  *      Returns > 0 on success or negative error code on failure.
 468  */
 469 int __init i2o_pci_init(void)
 470 {
 471         return pci_register_driver(&i2o_pci_driver);
 472 };
 473
 474 /**
 475  *      i2o_pci_exit - unregisters I2O PCI driver from PCI subsystem
 476  */
 477 void __exit i2o_pci_exit(void)
 478 {
 479         pci_unregister_driver(&i2o_pci_driver);
 480 };
 481
 482 EXPORT_SYMBOL(i2o_dma_realloc);
 483 MODULE_DEVICE_TABLE(pci, i2o_pci_ids);