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         /* Motorola/Freescale chip does not follow spec */
 172         if (pdev->vendor == PCI_VENDOR_ID_MOTOROLA && pdev->device == 0x18c0) {
 173                 /* Check if CPU is enabled */
 174                 if (be32_to_cpu(readl(c->base.virt + 0x10000)) & 0x10000000) {
 175                         printk(KERN_INFO "%s: MPC82XX needs CPU running to "
 176                                "service I2O.\n", c->name);
 177                         i2o_pci_free(c);
 178                         return -ENODEV;
 179                 } else {
 180                         c->irq_status += I2O_MOTOROLA_PORT_OFFSET;
 181                         c->irq_mask += I2O_MOTOROLA_PORT_OFFSET;
 182                         c->in_port += I2O_MOTOROLA_PORT_OFFSET;
 183                         c->out_port += I2O_MOTOROLA_PORT_OFFSET;
 184                         printk(KERN_INFO "%s: MPC82XX workarounds activated.\n",
 185                                c->name);
 186                 }
 187         }
 188
 189         if (i2o_dma_alloc(dev, &c->status, 8, GFP_KERNEL)) {
 190                 i2o_pci_free(c);
 191                 return -ENOMEM;
 192         }
 193
 194         if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt), GFP_KERNEL)) {
 195                 i2o_pci_free(c);
 196                 return -ENOMEM;
 197         }
 198
 199         if (i2o_dma_alloc(dev, &c->dlct, 8192, GFP_KERNEL)) {
 200                 i2o_pci_free(c);
 201                 return -ENOMEM;
 202         }
 203
 204         if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block),
 205                           GFP_KERNEL)) {
 206                 i2o_pci_free(c);
 207                 return -ENOMEM;
 208         }
 209
 210         if (i2o_dma_alloc
 211             (dev, &c->out_queue,
 212              I2O_MAX_OUTBOUND_MSG_FRAMES * I2O_OUTBOUND_MSG_FRAME_SIZE *
 213              sizeof(u32), GFP_KERNEL)) {
 214                 i2o_pci_free(c);
 215                 return -ENOMEM;
 216         }
 217
 218         pci_set_drvdata(pdev, c);
 219
 220         return 0;
 221 }
 222
 223 /**
 224  *      i2o_pci_interrupt - Interrupt handler for I2O controller
 225  *      @irq: interrupt line
 226  *      @dev_id: pointer to the I2O controller
 227  *      @r: pointer to registers
 228  *
 229  *      Handle an interrupt from a PCI based I2O controller. This turns out
 230  *      to be rather simple. We keep the controller pointer in the cookie.
 231  */
 232 static irqreturn_t i2o_pci_interrupt(int irq, void *dev_id, struct pt_regs *r)
 233 {
 234         struct i2o_controller *c = dev_id;
 235         u32 m;
 236         irqreturn_t rc = IRQ_NONE;
 237
 238         while (readl(c->irq_status) & I2O_IRQ_OUTBOUND_POST) {
 239                 m = readl(c->out_port);
 240                 if (m == I2O_QUEUE_EMPTY) {
 241                         /*
 242                          * Old 960 steppings had a bug in the I2O unit that
 243                          * caused the queue to appear empty when it wasn't.
 244                          */
 245                         m = readl(c->out_port);
 246                         if (unlikely(m == I2O_QUEUE_EMPTY))
 247                                 break;
 248                 }
 249
 250                 /* dispatch it */
 251                 if (i2o_driver_dispatch(c, m))
 252                         /* flush it if result != 0 */
 253                         i2o_flush_reply(c, m);
 254
 255                 rc = IRQ_HANDLED;
 256         }
 257
 258         return rc;
 259 }
 260
 261 /**
 262  *      i2o_pci_irq_enable - Allocate interrupt for I2O controller
 263  *
 264  *      Allocate an interrupt for the I2O controller, and activate interrupts
 265  *      on the I2O controller.
 266  *
 267  *      Returns 0 on success or negative error code on failure.
 268  */
 269 static int i2o_pci_irq_enable(struct i2o_controller *c)
 270 {
 271         struct pci_dev *pdev = c->pdev;
 272         int rc;
 273
 274         writel(0xffffffff, c->irq_mask);
 275
 276         if (pdev->irq) {
 277                 rc = request_irq(pdev->irq, i2o_pci_interrupt, IRQF_SHARED,
 278                                  c->name, c);
 279                 if (rc < 0) {
 280                         printk(KERN_ERR "%s: unable to allocate interrupt %d."
 281                                "\n", c->name, pdev->irq);
 282                         return rc;
 283                 }
 284         }
 285
 286         writel(0x00000000, c->irq_mask);
 287
 288         printk(KERN_INFO "%s: Installed at IRQ %d\n", c->name, pdev->irq);
 289
 290         return 0;
 291 }
 292
 293 /**
 294  *      i2o_pci_irq_disable - Free interrupt for I2O controller
 295  *      @c: I2O controller
 296  *
 297  *      Disable interrupts in I2O controller and then free interrupt.
 298  */
 299 static void i2o_pci_irq_disable(struct i2o_controller *c)
 300 {
 301         writel(0xffffffff, c->irq_mask);
 302
 303         if (c->pdev->irq > 0)
 304                 free_irq(c->pdev->irq, c);
 305 }
 306
 307 /**
 308  *      i2o_pci_probe - Probe the PCI device for an I2O controller
 309  *      @dev: PCI device to test
 310  *      @id: id which matched with the PCI device id table
 311  *
 312  *      Probe the PCI device for any device which is a memory of the
 313  *      Intelligent, I2O class or an Adaptec Zero Channel Controller. We
 314  *      attempt to set up each such device and register it with the core.
 315  *
 316  *      Returns 0 on success or negative error code on failure.
 317  */
 318 static int __devinit i2o_pci_probe(struct pci_dev *pdev,
 319                                    const struct pci_device_id *id)
 320 {
 321         struct i2o_controller *c;
 322         int rc;
 323         struct pci_dev *i960 = NULL;
 324         int enabled = pdev->is_enabled;
 325
 326         printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n");
 327
 328         if ((pdev->class & 0xff) > 1) {
 329                 printk(KERN_WARNING "i2o: %s does not support I2O 1.5 "
 330                        "(skipping).\n", pci_name(pdev));
 331                 return -ENODEV;
 332         }
 333
 334         if (!enabled)
 335                 if ((rc = pci_enable_device(pdev))) {
 336                         printk(KERN_WARNING "i2o: couldn't enable device %s\n",
 337                                pci_name(pdev));
 338                         return rc;
 339                 }
 340
 341         if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
 342                 printk(KERN_WARNING "i2o: no suitable DMA found for %s\n",
 343                        pci_name(pdev));
 344                 rc = -ENODEV;
 345                 goto disable;
 346         }
 347
 348         pci_set_master(pdev);
 349
 350         c = i2o_iop_alloc();
 351         if (IS_ERR(c)) {
 352                 printk(KERN_ERR "i2o: couldn't allocate memory for %s\n",
 353                        pci_name(pdev));
 354                 rc = PTR_ERR(c);
 355                 goto disable;
 356         } else
 357                 printk(KERN_INFO "%s: controller found (%s)\n", c->name,
 358                        pci_name(pdev));
 359
 360         c->pdev = pdev;
 361         c->device.parent = &pdev->dev;
 362
 363         /* Cards that fall apart if you hit them with large I/O loads... */
 364         if (pdev->vendor == PCI_VENDOR_ID_NCR && pdev->device == 0x0630) {
 365                 c->short_req = 1;
 366                 printk(KERN_INFO "%s: Symbios FC920 workarounds activated.\n",
 367                        c->name);
 368         }
 369
 370         if (pdev->subsystem_vendor == PCI_VENDOR_ID_PROMISE) {
 371                 /*
 372                  * Expose the ship behind i960 for initialization, or it will
 373                  * failed
 374                  */
 375                 i960 =
 376                     pci_find_slot(c->pdev->bus->number,
 377                                   PCI_DEVFN(PCI_SLOT(c->pdev->devfn), 0));
 378
 379                 if (i960)
 380                         pci_write_config_word(i960, 0x42, 0);
 381
 382                 c->promise = 1;
 383                 c->limit_sectors = 1;
 384         }
 385
 386         if (pdev->subsystem_vendor == PCI_VENDOR_ID_DPT)
 387                 c->adaptec = 1;
 388
 389         /* Cards that go bananas if you quiesce them before you reset them. */
 390         if (pdev->vendor == PCI_VENDOR_ID_DPT) {
 391                 c->no_quiesce = 1;
 392                 if (pdev->device == 0xa511)
 393                         c->raptor = 1;
 394
 395                 if (pdev->subsystem_device == 0xc05a) {
 396                         c->limit_sectors = 1;
 397                         printk(KERN_INFO
 398                                "%s: limit sectors per request to %d\n", c->name,
 399                                I2O_MAX_SECTORS_LIMITED);
 400                 }
 401 #ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
 402                 if (sizeof(dma_addr_t) > 4) {
 403                         if (pci_set_dma_mask(pdev, DMA_64BIT_MASK))
 404                                 printk(KERN_INFO "%s: 64-bit DMA unavailable\n",
 405                                        c->name);
 406                         else {
 407                                 c->pae_support = 1;
 408                                 printk(KERN_INFO "%s: using 64-bit DMA\n",
 409                                        c->name);
 410                         }
 411                 }
 412 #endif
 413         }
 414
 415         if ((rc = i2o_pci_alloc(c))) {
 416                 printk(KERN_ERR "%s: DMA / IO allocation for I2O controller "
 417                        "failed\n", c->name);
 418                 goto free_controller;
 419         }
 420
 421         if (i2o_pci_irq_enable(c)) {
 422                 printk(KERN_ERR "%s: unable to enable interrupts for I2O "
 423                        "controller\n", c->name);
 424                 goto free_pci;
 425         }
 426
 427         if ((rc = i2o_iop_add(c)))
 428                 goto uninstall;
 429
 430         if (i960)
 431                 pci_write_config_word(i960, 0x42, 0x03ff);
 432
 433         return 0;
 434
 435       uninstall:
 436         i2o_pci_irq_disable(c);
 437
 438       free_pci:
 439         i2o_pci_free(c);
 440
 441       free_controller:
 442         i2o_iop_free(c);
 443
 444       disable:
 445         if (!enabled)
 446                 pci_disable_device(pdev);
 447
 448         return rc;
 449 }
 450
 451 /**
 452  *      i2o_pci_remove - Removes a I2O controller from the system
 453  *      pdev: I2O controller which should be removed
 454  *
 455  *      Reset the I2O controller, disable interrupts and remove all allocated
 456  *      resources.
 457  */
 458 static void __devexit i2o_pci_remove(struct pci_dev *pdev)
 459 {
 460         struct i2o_controller *c;
 461         c = pci_get_drvdata(pdev);
 462
 463         i2o_iop_remove(c);
 464         i2o_pci_irq_disable(c);
 465         i2o_pci_free(c);
 466
 467         pci_disable_device(pdev);
 468
 469         printk(KERN_INFO "%s: Controller removed.\n", c->name);
 470
 471         put_device(&c->device);
 472 };
 473
 474 /* PCI driver for I2O controller */
 475 static struct pci_driver i2o_pci_driver = {
 476         .name = "PCI_I2O",
 477         .id_table = i2o_pci_ids,
 478         .probe = i2o_pci_probe,
 479         .remove = __devexit_p(i2o_pci_remove),
 480 };
 481
 482 /**
 483  *      i2o_pci_init - registers I2O PCI driver in PCI subsystem
 484  *
 485  *      Returns > 0 on success or negative error code on failure.
 486  */
 487 int __init i2o_pci_init(void)
 488 {
 489         return pci_register_driver(&i2o_pci_driver);
 490 };
 491
 492 /**
 493  *      i2o_pci_exit - unregisters I2O PCI driver from PCI subsystem
 494  */
 495 void __exit i2o_pci_exit(void)
 496 {
 497         pci_unregister_driver(&i2o_pci_driver);
 498 };
 499
 500 MODULE_DEVICE_TABLE(pci, i2o_pci_ids);