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         if (pci_request_regions(pdev, OSM_DESCRIPTION)) {
  92                 printk(KERN_ERR "%s: device already claimed\n", c->name);
  93                 return -ENODEV;
  94         }
  95
  96         for (i = 0; i < 6; i++) {
  97                 /* Skip I/O spaces */
  98                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
  99                         if (!c->base.phys) {
 100                                 c->base.phys = pci_resource_start(pdev, i);
 101                                 c->base.len = pci_resource_len(pdev, i);
 102
 103                                 /*
 104                                  * If we know what card it is, set the size
 105                                  * correctly. Code is taken from dpt_i2o.c
 106                                  */
 107                                 if (pdev->device == 0xa501) {
 108                                         if (pdev->subsystem_device >= 0xc032 &&
 109                                             pdev->subsystem_device <= 0xc03b) {
 110                                                 if (c->base.len > 0x400000)
 111                                                         c->base.len = 0x400000;
 112                                         } else {
 113                                                 if (c->base.len > 0x100000)
 114                                                         c->base.len = 0x100000;
 115                                         }
 116                                 }
 117                                 if (!c->raptor)
 118                                         break;
 119                         } else {
 120                                 c->in_queue.phys = pci_resource_start(pdev, i);
 121                                 c->in_queue.len = pci_resource_len(pdev, i);
 122                                 break;
 123                         }
 124                 }
 125         }
 126
 127         if (i == 6) {
 128                 printk(KERN_ERR "%s: I2O controller has no memory regions"
 129                        " defined.\n", c->name);
 130                 i2o_pci_free(c);
 131                 return -EINVAL;
 132         }
 133
 134         /* Map the I2O controller */
 135         if (c->raptor) {
 136                 printk(KERN_INFO "%s: PCI I2O controller\n", c->name);
 137                 printk(KERN_INFO "     BAR0 at 0x%08lX size=%ld\n",
 138                        (unsigned long)c->base.phys, (unsigned long)c->base.len);
 139                 printk(KERN_INFO "     BAR1 at 0x%08lX size=%ld\n",
 140                        (unsigned long)c->in_queue.phys,
 141                        (unsigned long)c->in_queue.len);
 142         } else
 143                 printk(KERN_INFO "%s: PCI I2O controller at %08lX size=%ld\n",
 144                        c->name, (unsigned long)c->base.phys,
 145                        (unsigned long)c->base.len);
 146
 147         c->base.virt = ioremap_nocache(c->base.phys, c->base.len);
 148         if (!c->base.virt) {
 149                 printk(KERN_ERR "%s: Unable to map controller.\n", c->name);
 150                 i2o_pci_free(c);
 151                 return -ENOMEM;
 152         }
 153
 154         if (c->raptor) {
 155                 c->in_queue.virt =
 156                     ioremap_nocache(c->in_queue.phys, c->in_queue.len);
 157                 if (!c->in_queue.virt) {
 158                         printk(KERN_ERR "%s: Unable to map controller.\n",
 159                                c->name);
 160                         i2o_pci_free(c);
 161                         return -ENOMEM;
 162                 }
 163         } else
 164                 c->in_queue = c->base;
 165
 166         c->irq_status = c->base.virt + I2O_IRQ_STATUS;
 167         c->irq_mask = c->base.virt + I2O_IRQ_MASK;
 168         c->in_port = c->base.virt + I2O_IN_PORT;
 169         c->out_port = c->base.virt + I2O_OUT_PORT;
 170
 171         if (i2o_dma_alloc(dev, &c->status, 8, GFP_KERNEL)) {
 172                 i2o_pci_free(c);
 173                 return -ENOMEM;
 174         }
 175
 176         if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt), GFP_KERNEL)) {
 177                 i2o_pci_free(c);
 178                 return -ENOMEM;
 179         }
 180
 181         if (i2o_dma_alloc(dev, &c->dlct, 8192, GFP_KERNEL)) {
 182                 i2o_pci_free(c);
 183                 return -ENOMEM;
 184         }
 185
 186         if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block),
 187                           GFP_KERNEL)) {
 188                 i2o_pci_free(c);
 189                 return -ENOMEM;
 190         }
 191
 192         if (i2o_dma_alloc
 193             (dev, &c->out_queue,
 194              I2O_MAX_OUTBOUND_MSG_FRAMES * I2O_OUTBOUND_MSG_FRAME_SIZE *
 195              sizeof(u32), GFP_KERNEL)) {
 196                 i2o_pci_free(c);
 197                 return -ENOMEM;
 198         }
 199
 200         pci_set_drvdata(pdev, c);
 201
 202         return 0;
 203 }
 204
 205 /**
 206  *      i2o_pci_interrupt - Interrupt handler for I2O controller
 207  *      @irq: interrupt line
 208  *      @dev_id: pointer to the I2O controller
 209  *      @r: pointer to registers
 210  *
 211  *      Handle an interrupt from a PCI based I2O controller. This turns out
 212  *      to be rather simple. We keep the controller pointer in the cookie.
 213  */
 214 static irqreturn_t i2o_pci_interrupt(int irq, void *dev_id, struct pt_regs *r)
 215 {
 216         struct i2o_controller *c = dev_id;
 217         u32 m;
 218         irqreturn_t rc = IRQ_NONE;
 219
 220         while (readl(c->irq_status) & I2O_IRQ_OUTBOUND_POST) {
 221                 m = readl(c->out_port);
 222                 if (m == I2O_QUEUE_EMPTY) {
 223                         /*
 224                          * Old 960 steppings had a bug in the I2O unit that
 225                          * caused the queue to appear empty when it wasn't.
 226                          */
 227                         m = readl(c->out_port);
 228                         if (unlikely(m == I2O_QUEUE_EMPTY))
 229                                 break;
 230                 }
 231
 232                 /* dispatch it */
 233                 if (i2o_driver_dispatch(c, m))
 234                         /* flush it if result != 0 */
 235                         i2o_flush_reply(c, m);
 236
 237                 rc = IRQ_HANDLED;
 238         }
 239
 240         return rc;
 241 }
 242
 243 /**
 244  *      i2o_pci_irq_enable - Allocate interrupt for I2O controller
 245  *
 246  *      Allocate an interrupt for the I2O controller, and activate interrupts
 247  *      on the I2O controller.
 248  *
 249  *      Returns 0 on success or negative error code on failure.
 250  */
 251 static int i2o_pci_irq_enable(struct i2o_controller *c)
 252 {
 253         struct pci_dev *pdev = c->pdev;
 254         int rc;
 255
 256         writel(0xffffffff, c->irq_mask);
 257
 258         if (pdev->irq) {
 259                 rc = request_irq(pdev->irq, i2o_pci_interrupt, SA_SHIRQ,
 260                                  c->name, c);
 261                 if (rc < 0) {
 262                         printk(KERN_ERR "%s: unable to allocate interrupt %d."
 263                                "\n", c->name, pdev->irq);
 264                         return rc;
 265                 }
 266         }
 267
 268         writel(0x00000000, c->irq_mask);
 269
 270         printk(KERN_INFO "%s: Installed at IRQ %d\n", c->name, pdev->irq);
 271
 272         return 0;
 273 }
 274
 275 /**
 276  *      i2o_pci_irq_disable - Free interrupt for I2O controller
 277  *      @c: I2O controller
 278  *
 279  *      Disable interrupts in I2O controller and then free interrupt.
 280  */
 281 static void i2o_pci_irq_disable(struct i2o_controller *c)
 282 {
 283         writel(0xffffffff, c->irq_mask);
 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                 c->limit_sectors = 1;
 364         }
 365
 366         if (pdev->subsystem_vendor == PCI_VENDOR_ID_DPT)
 367                 c->adaptec = 1;
 368
 369         /* Cards that go bananas if you quiesce them before you reset them. */
 370         if (pdev->vendor == PCI_VENDOR_ID_DPT) {
 371                 c->no_quiesce = 1;
 372                 if (pdev->device == 0xa511)
 373                         c->raptor = 1;
 374
 375                 if (pdev->subsystem_device == 0xc05a) {
 376                         c->limit_sectors = 1;
 377                         printk(KERN_INFO
 378                                "%s: limit sectors per request to %d\n", c->name,
 379                                I2O_MAX_SECTORS_LIMITED);
 380                 }
 381 #ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
 382                 if (sizeof(dma_addr_t) > 4) {
 383                         if (pci_set_dma_mask(pdev, DMA_64BIT_MASK))
 384                                 printk(KERN_INFO "%s: 64-bit DMA unavailable\n",
 385                                        c->name);
 386                         else {
 387                                 c->pae_support = 1;
 388                                 printk(KERN_INFO "%s: using 64-bit DMA\n",
 389                                        c->name);
 390                         }
 391                 }
 392 #endif
 393         }
 394
 395         if ((rc = i2o_pci_alloc(c))) {
 396                 printk(KERN_ERR "%s: DMA / IO allocation for I2O controller "
 397                        " failed\n", c->name);
 398                 goto free_controller;
 399         }
 400
 401         if (i2o_pci_irq_enable(c)) {
 402                 printk(KERN_ERR "%s: unable to enable interrupts for I2O "
 403                        "controller\n", c->name);
 404                 goto free_pci;
 405         }
 406
 407         if ((rc = i2o_iop_add(c)))
 408                 goto uninstall;
 409
 410         get_device(&c->device);
 411
 412         if (i960)
 413                 pci_write_config_word(i960, 0x42, 0x03ff);
 414
 415         return 0;
 416
 417       uninstall:
 418         i2o_pci_irq_disable(c);
 419
 420       free_pci:
 421         i2o_pci_free(c);
 422
 423       free_controller:
 424         i2o_iop_free(c);
 425         put_device(c->device.parent);
 426
 427       disable:
 428         pci_disable_device(pdev);
 429
 430         return rc;
 431 }
 432
 433 /**
 434  *      i2o_pci_remove - Removes a I2O controller from the system
 435  *      pdev: I2O controller which should be removed
 436  *
 437  *      Reset the I2O controller, disable interrupts and remove all allocated
 438  *      resources.
 439  */
 440 static void __devexit i2o_pci_remove(struct pci_dev *pdev)
 441 {
 442         struct i2o_controller *c;
 443         c = pci_get_drvdata(pdev);
 444
 445         i2o_iop_remove(c);
 446         i2o_pci_irq_disable(c);
 447         i2o_pci_free(c);
 448
 449         pci_disable_device(pdev);
 450
 451         printk(KERN_INFO "%s: Controller removed.\n", c->name);
 452
 453         put_device(c->device.parent);
 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 MODULE_DEVICE_TABLE(pci, i2o_pci_ids);