git.oblomov.eu Git - 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 #include "core.h"
  34
  35 #define OSM_DESCRIPTION "I2O-subsystem"
  36
  37 /* PCI device id table for all I2O controllers */
  38 static struct pci_device_id __devinitdata i2o_pci_ids[] = {
  39         {PCI_DEVICE_CLASS(PCI_CLASS_INTELLIGENT_I2O << 8, 0xffff00)},
  40         {PCI_DEVICE(PCI_VENDOR_ID_DPT, 0xa511)},
  41         {.vendor = PCI_VENDOR_ID_INTEL,.device = 0x1962,
  42          .subvendor = PCI_VENDOR_ID_PROMISE,.subdevice = PCI_ANY_ID},
  43         {0}
  44 };
  45
  46 /**
  47  *      i2o_pci_free - Frees the DMA memory for the I2O controller
  48  *      @c: I2O controller to free
  49  *
  50  *      Remove all allocated DMA memory and unmap memory IO regions. If MTRR
  51  *      is enabled, also remove it again.
  52  */
  53 static void i2o_pci_free(struct i2o_controller *c)
  54 {
  55         struct device *dev;
  56
  57         dev = &c->pdev->dev;
  58
  59         i2o_dma_free(dev, &c->out_queue);
  60         i2o_dma_free(dev, &c->status_block);
  61         kfree(c->lct);
  62         i2o_dma_free(dev, &c->dlct);
  63         i2o_dma_free(dev, &c->hrt);
  64         i2o_dma_free(dev, &c->status);
  65
  66         if (c->raptor && c->in_queue.virt)
  67                 iounmap(c->in_queue.virt);
  68
  69         if (c->base.virt)
  70                 iounmap(c->base.virt);
  71
  72         pci_release_regions(c->pdev);
  73 }
  74
  75 /**
  76  *      i2o_pci_alloc - Allocate DMA memory, map IO memory for I2O controller
  77  *      @c: I2O controller
  78  *
  79  *      Allocate DMA memory for a PCI (or in theory AGP) I2O controller. All
  80  *      IO mappings are also done here. If MTRR is enabled, also do add memory
  81  *      regions here.
  82  *
  83  *      Returns 0 on success or negative error code on failure.
  84  */
  85 static int __devinit i2o_pci_alloc(struct i2o_controller *c)
  86 {
  87         struct pci_dev *pdev = c->pdev;
  88         struct device *dev = &pdev->dev;
  89         int i;
  90
  91         for (i = 0; i < 6; i++) {
  92                 /* Skip I/O spaces */
  93                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
  94                         if (!c->base.phys) {
  95                                 c->base.phys = pci_resource_start(pdev, i);
  96                                 c->base.len = pci_resource_len(pdev, i);
  97
  98                                 /*
  99                                  * If we know what card it is, set the size
 100                                  * correctly. Code is taken from dpt_i2o.c
 101                                  */
 102                                 if (pdev->device == 0xa501) {
 103                                         if (pdev->subsystem_device >= 0xc032 &&
 104                                             pdev->subsystem_device <= 0xc03b) {
 105                                                 if (c->base.len > 0x400000)
 106                                                         c->base.len = 0x400000;
 107                                         } else {
 108                                                 if (c->base.len > 0x100000)
 109                                                         c->base.len = 0x100000;
 110                                         }
 111                                 }
 112                                 if (!c->raptor)
 113                                         break;
 114                         } else {
 115                                 c->in_queue.phys = pci_resource_start(pdev, i);
 116                                 c->in_queue.len = pci_resource_len(pdev, i);
 117                                 break;
 118                         }
 119                 }
 120         }
 121
 122         if (i == 6) {
 123                 printk(KERN_ERR "%s: I2O controller has no memory regions"
 124                        " defined.\n", c->name);
 125                 i2o_pci_free(c);
 126                 return -EINVAL;
 127         }
 128
 129         /* Map the I2O controller */
 130         if (c->raptor) {
 131                 printk(KERN_INFO "%s: PCI I2O controller\n", c->name);
 132                 printk(KERN_INFO "     BAR0 at 0x%08lX size=%ld\n",
 133                        (unsigned long)c->base.phys, (unsigned long)c->base.len);
 134                 printk(KERN_INFO "     BAR1 at 0x%08lX size=%ld\n",
 135                        (unsigned long)c->in_queue.phys,
 136                        (unsigned long)c->in_queue.len);
 137         } else
 138                 printk(KERN_INFO "%s: PCI I2O controller at %08lX size=%ld\n",
 139                        c->name, (unsigned long)c->base.phys,
 140                        (unsigned long)c->base.len);
 141
 142         c->base.virt = ioremap_nocache(c->base.phys, c->base.len);
 143         if (!c->base.virt) {
 144                 printk(KERN_ERR "%s: Unable to map controller.\n", c->name);
 145                 i2o_pci_free(c);
 146                 return -ENOMEM;
 147         }
 148
 149         if (c->raptor) {
 150                 c->in_queue.virt =
 151                     ioremap_nocache(c->in_queue.phys, c->in_queue.len);
 152                 if (!c->in_queue.virt) {
 153                         printk(KERN_ERR "%s: Unable to map controller.\n",
 154                                c->name);
 155                         i2o_pci_free(c);
 156                         return -ENOMEM;
 157                 }
 158         } else
 159                 c->in_queue = c->base;
 160
 161         c->irq_status = c->base.virt + I2O_IRQ_STATUS;
 162         c->irq_mask = c->base.virt + I2O_IRQ_MASK;
 163         c->in_port = c->base.virt + I2O_IN_PORT;
 164         c->out_port = c->base.virt + I2O_OUT_PORT;
 165
 166         if (i2o_dma_alloc(dev, &c->status, 8, GFP_KERNEL)) {
 167                 i2o_pci_free(c);
 168                 return -ENOMEM;
 169         }
 170
 171         if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt), GFP_KERNEL)) {
 172                 i2o_pci_free(c);
 173                 return -ENOMEM;
 174         }
 175
 176         if (i2o_dma_alloc(dev, &c->dlct, 8192, GFP_KERNEL)) {
 177                 i2o_pci_free(c);
 178                 return -ENOMEM;
 179         }
 180
 181         if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block),
 182                           GFP_KERNEL)) {
 183                 i2o_pci_free(c);
 184                 return -ENOMEM;
 185         }
 186
 187         if (i2o_dma_alloc
 188             (dev, &c->out_queue,
 189              I2O_MAX_OUTBOUND_MSG_FRAMES * I2O_OUTBOUND_MSG_FRAME_SIZE *
 190              sizeof(u32), 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         writel(0xffffffff, c->irq_mask);
 252
 253         if (pdev->irq) {
 254                 rc = request_irq(pdev->irq, i2o_pci_interrupt, SA_SHIRQ,
 255                                  c->name, c);
 256                 if (rc < 0) {
 257                         printk(KERN_ERR "%s: unable to allocate interrupt %d."
 258                                "\n", c->name, pdev->irq);
 259                         return rc;
 260                 }
 261         }
 262
 263         writel(0x00000000, c->irq_mask);
 264
 265         printk(KERN_INFO "%s: Installed at IRQ %d\n", c->name, pdev->irq);
 266
 267         return 0;
 268 }
 269
 270 /**
 271  *      i2o_pci_irq_disable - Free interrupt for I2O controller
 272  *      @c: I2O controller
 273  *
 274  *      Disable interrupts in I2O controller and then free interrupt.
 275  */
 276 static void i2o_pci_irq_disable(struct i2o_controller *c)
 277 {
 278         writel(0xffffffff, c->irq_mask);
 279
 280         if (c->pdev->irq > 0)
 281                 free_irq(c->pdev->irq, c);
 282 }
 283
 284 /**
 285  *      i2o_pci_probe - Probe the PCI device for an I2O controller
 286  *      @dev: PCI device to test
 287  *      @id: id which matched with the PCI device id table
 288  *
 289  *      Probe the PCI device for any device which is a memory of the
 290  *      Intelligent, I2O class or an Adaptec Zero Channel Controller. We
 291  *      attempt to set up each such device and register it with the core.
 292  *
 293  *      Returns 0 on success or negative error code on failure.
 294  */
 295 static int __devinit i2o_pci_probe(struct pci_dev *pdev,
 296                                    const struct pci_device_id *id)
 297 {
 298         struct i2o_controller *c;
 299         int rc;
 300         struct pci_dev *i960 = NULL;
 301         int pci_dev_busy = 0;
 302
 303         printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n");
 304
 305         if ((pdev->class & 0xff) > 1) {
 306                 printk(KERN_WARNING "i2o: %s does not support I2O 1.5 "
 307                        "(skipping).\n", pci_name(pdev));
 308                 return -ENODEV;
 309         }
 310
 311         if ((rc = pci_enable_device(pdev))) {
 312                 printk(KERN_WARNING "i2o: couldn't enable device %s\n",
 313                        pci_name(pdev));
 314                 return rc;
 315         }
 316
 317         if (pci_request_regions(pdev, OSM_DESCRIPTION)) {
 318                 printk(KERN_ERR "i2o: device already claimed\n");
 319                 return -ENODEV;
 320         }
 321
 322         if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
 323                 printk(KERN_WARNING "i2o: no suitable DMA found for %s\n",
 324                        pci_name(pdev));
 325                 rc = -ENODEV;
 326                 goto disable;
 327         }
 328
 329         pci_set_master(pdev);
 330
 331         c = i2o_iop_alloc();
 332         if (IS_ERR(c)) {
 333                 printk(KERN_ERR "i2o: couldn't allocate memory for %s\n",
 334                        pci_name(pdev));
 335                 rc = PTR_ERR(c);
 336                 goto disable;
 337         } else
 338                 printk(KERN_INFO "%s: controller found (%s)\n", c->name,
 339                        pci_name(pdev));
 340
 341         c->pdev = pdev;
 342         c->device.parent = &pdev->dev;
 343
 344         /* Cards that fall apart if you hit them with large I/O loads... */
 345         if (pdev->vendor == PCI_VENDOR_ID_NCR && pdev->device == 0x0630) {
 346                 c->short_req = 1;
 347                 printk(KERN_INFO "%s: Symbios FC920 workarounds activated.\n",
 348                        c->name);
 349         }
 350
 351         if (pdev->subsystem_vendor == PCI_VENDOR_ID_PROMISE) {
 352                 /*
 353                  * Expose the ship behind i960 for initialization, or it will
 354                  * failed
 355                  */
 356                 i960 =
 357                     pci_find_slot(c->pdev->bus->number,
 358                                   PCI_DEVFN(PCI_SLOT(c->pdev->devfn), 0));
 359
 360                 if (i960)
 361                         pci_write_config_word(i960, 0x42, 0);
 362
 363                 c->promise = 1;
 364                 c->limit_sectors = 1;
 365         }
 366
 367         if (pdev->subsystem_vendor == PCI_VENDOR_ID_DPT)
 368                 c->adaptec = 1;
 369
 370         /* Cards that go bananas if you quiesce them before you reset them. */
 371         if (pdev->vendor == PCI_VENDOR_ID_DPT) {
 372                 c->no_quiesce = 1;
 373                 if (pdev->device == 0xa511)
 374                         c->raptor = 1;
 375
 376                 if (pdev->subsystem_device == 0xc05a) {
 377                         c->limit_sectors = 1;
 378                         printk(KERN_INFO
 379                                "%s: limit sectors per request to %d\n", c->name,
 380                                I2O_MAX_SECTORS_LIMITED);
 381                 }
 382 #ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
 383                 if (sizeof(dma_addr_t) > 4) {
 384                         if (pci_set_dma_mask(pdev, DMA_64BIT_MASK))
 385                                 printk(KERN_INFO "%s: 64-bit DMA unavailable\n",
 386                                        c->name);
 387                         else {
 388                                 c->pae_support = 1;
 389                                 printk(KERN_INFO "%s: using 64-bit DMA\n",
 390                                        c->name);
 391                         }
 392                 }
 393 #endif
 394         }
 395
 396         if ((rc = i2o_pci_alloc(c))) {
 397                 printk(KERN_ERR "%s: DMA / IO allocation for I2O controller "
 398                        " failed\n", c->name);
 399                 if (rc == -ENODEV)
 400                         pci_dev_busy = 1;
 401                 goto free_controller;
 402         }
 403
 404         if (i2o_pci_irq_enable(c)) {
 405                 printk(KERN_ERR "%s: unable to enable interrupts for I2O "
 406                        "controller\n", c->name);
 407                 goto free_pci;
 408         }
 409
 410         if ((rc = i2o_iop_add(c)))
 411                 goto uninstall;
 412
 413         if (i960)
 414                 pci_write_config_word(i960, 0x42, 0x03ff);
 415
 416         return 0;
 417
 418       uninstall:
 419         i2o_pci_irq_disable(c);
 420
 421       free_pci:
 422         i2o_pci_free(c);
 423
 424       free_controller:
 425         i2o_iop_free(c);
 426
 427       disable:
 428         if (!pci_dev_busy)
 429                 pci_disable_device(pdev);
 430
 431         return rc;
 432 }
 433
 434 /**
 435  *      i2o_pci_remove - Removes a I2O controller from the system
 436  *      pdev: I2O controller which should be removed
 437  *
 438  *      Reset the I2O controller, disable interrupts and remove all allocated
 439  *      resources.
 440  */
 441 static void __devexit i2o_pci_remove(struct pci_dev *pdev)
 442 {
 443         struct i2o_controller *c;
 444         c = pci_get_drvdata(pdev);
 445
 446         i2o_iop_remove(c);
 447         i2o_pci_irq_disable(c);
 448         i2o_pci_free(c);
 449
 450         pci_disable_device(pdev);
 451
 452         printk(KERN_INFO "%s: Controller removed.\n", c->name);
 453
 454         put_device(&c->device);
 455 };
 456
 457 /* PCI driver for I2O controller */
 458 static struct pci_driver i2o_pci_driver = {
 459         .name = "PCI_I2O",
 460         .id_table = i2o_pci_ids,
 461         .probe = i2o_pci_probe,
 462         .remove = __devexit_p(i2o_pci_remove),
 463 };
 464
 465 /**
 466  *      i2o_pci_init - registers I2O PCI driver in PCI subsystem
 467  *
 468  *      Returns > 0 on success or negative error code on failure.
 469  */
 470 int __init i2o_pci_init(void)
 471 {
 472         return pci_register_driver(&i2o_pci_driver);
 473 };
 474
 475 /**
 476  *      i2o_pci_exit - unregisters I2O PCI driver from PCI subsystem
 477  */
 478 void __exit i2o_pci_exit(void)
 479 {
 480         pci_unregister_driver(&i2o_pci_driver);
 481 };
 482
 483 MODULE_DEVICE_TABLE(pci, i2o_pci_ids);