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@lxorguk.ukuu.org.uk>:
  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/slab.h>
  33 #include <linux/i2o.h>
  34 #include "core.h"
  35
  36 #define OSM_DESCRIPTION "I2O-subsystem"
  37
  38 /* PCI device id table for all I2O controllers */
  39 static struct pci_device_id __devinitdata i2o_pci_ids[] = {
  40         {PCI_DEVICE_CLASS(PCI_CLASS_INTELLIGENT_I2O << 8, 0xffff00)},
  41         {PCI_DEVICE(PCI_VENDOR_ID_DPT, 0xa511)},
  42         {.vendor = PCI_VENDOR_ID_INTEL,.device = 0x1962,
  43          .subvendor = PCI_VENDOR_ID_PROMISE,.subdevice = PCI_ANY_ID},
  44         {0}
  45 };
  46
  47 /**
  48  *      i2o_pci_free - Frees the DMA memory for the I2O controller
  49  *      @c: I2O controller to free
  50  *
  51  *      Remove all allocated DMA memory and unmap memory IO regions. If MTRR
  52  *      is enabled, also remove it again.
  53  */
  54 static void i2o_pci_free(struct i2o_controller *c)
  55 {
  56         struct device *dev;
  57
  58         dev = &c->pdev->dev;
  59
  60         i2o_dma_free(dev, &c->out_queue);
  61         i2o_dma_free(dev, &c->status_block);
  62         kfree(c->lct);
  63         i2o_dma_free(dev, &c->dlct);
  64         i2o_dma_free(dev, &c->hrt);
  65         i2o_dma_free(dev, &c->status);
  66
  67         if (c->raptor && c->in_queue.virt)
  68                 iounmap(c->in_queue.virt);
  69
  70         if (c->base.virt)
  71                 iounmap(c->base.virt);
  72
  73         pci_release_regions(c->pdev);
  74 }
  75
  76 /**
  77  *      i2o_pci_alloc - Allocate DMA memory, map IO memory for I2O controller
  78  *      @c: I2O controller
  79  *
  80  *      Allocate DMA memory for a PCI (or in theory AGP) I2O controller. All
  81  *      IO mappings are also done here. If MTRR is enabled, also do add memory
  82  *      regions here.
  83  *
  84  *      Returns 0 on success or negative error code on failure.
  85  */
  86 static int __devinit i2o_pci_alloc(struct i2o_controller *c)
  87 {
  88         struct pci_dev *pdev = c->pdev;
  89         struct device *dev = &pdev->dev;
  90         int i;
  91
  92         if (pci_request_regions(pdev, OSM_DESCRIPTION)) {
  93                 printk(KERN_ERR "%s: device already claimed\n", c->name);
  94                 return -ENODEV;
  95         }
  96
  97         for (i = 0; i < 6; i++) {
  98                 /* Skip I/O spaces */
  99                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
 100                         if (!c->base.phys) {
 101                                 c->base.phys = pci_resource_start(pdev, i);
 102                                 c->base.len = pci_resource_len(pdev, i);
 103
 104                                 /*
 105                                  * If we know what card it is, set the size
 106                                  * correctly. Code is taken from dpt_i2o.c
 107                                  */
 108                                 if (pdev->device == 0xa501) {
 109                                         if (pdev->subsystem_device >= 0xc032 &&
 110                                             pdev->subsystem_device <= 0xc03b) {
 111                                                 if (c->base.len > 0x400000)
 112                                                         c->base.len = 0x400000;
 113                                         } else {
 114                                                 if (c->base.len > 0x100000)
 115                                                         c->base.len = 0x100000;
 116                                         }
 117                                 }
 118                                 if (!c->raptor)
 119                                         break;
 120                         } else {
 121                                 c->in_queue.phys = pci_resource_start(pdev, i);
 122                                 c->in_queue.len = pci_resource_len(pdev, i);
 123                                 break;
 124                         }
 125                 }
 126         }
 127
 128         if (i == 6) {
 129                 printk(KERN_ERR "%s: I2O controller has no memory regions"
 130                        " defined.\n", c->name);
 131                 i2o_pci_free(c);
 132                 return -EINVAL;
 133         }
 134
 135         /* Map the I2O controller */
 136         if (c->raptor) {
 137                 printk(KERN_INFO "%s: PCI I2O controller\n", c->name);
 138                 printk(KERN_INFO "     BAR0 at 0x%08lX size=%ld\n",
 139                        (unsigned long)c->base.phys, (unsigned long)c->base.len);
 140                 printk(KERN_INFO "     BAR1 at 0x%08lX size=%ld\n",
 141                        (unsigned long)c->in_queue.phys,
 142                        (unsigned long)c->in_queue.len);
 143         } else
 144                 printk(KERN_INFO "%s: PCI I2O controller at %08lX size=%ld\n",
 145                        c->name, (unsigned long)c->base.phys,
 146                        (unsigned long)c->base.len);
 147
 148         c->base.virt = ioremap_nocache(c->base.phys, c->base.len);
 149         if (!c->base.virt) {
 150                 printk(KERN_ERR "%s: Unable to map controller.\n", c->name);
 151                 i2o_pci_free(c);
 152                 return -ENOMEM;
 153         }
 154
 155         if (c->raptor) {
 156                 c->in_queue.virt =
 157                     ioremap_nocache(c->in_queue.phys, c->in_queue.len);
 158                 if (!c->in_queue.virt) {
 159                         printk(KERN_ERR "%s: Unable to map controller.\n",
 160                                c->name);
 161                         i2o_pci_free(c);
 162                         return -ENOMEM;
 163                 }
 164         } else
 165                 c->in_queue = c->base;
 166
 167         c->irq_status = c->base.virt + I2O_IRQ_STATUS;
 168         c->irq_mask = c->base.virt + I2O_IRQ_MASK;
 169         c->in_port = c->base.virt + I2O_IN_PORT;
 170         c->out_port = c->base.virt + I2O_OUT_PORT;
 171
 172         /* Motorola/Freescale chip does not follow spec */
 173         if (pdev->vendor == PCI_VENDOR_ID_MOTOROLA && pdev->device == 0x18c0) {
 174                 /* Check if CPU is enabled */
 175                 if (be32_to_cpu(readl(c->base.virt + 0x10000)) & 0x10000000) {
 176                         printk(KERN_INFO "%s: MPC82XX needs CPU running to "
 177                                "service I2O.\n", c->name);
 178                         i2o_pci_free(c);
 179                         return -ENODEV;
 180                 } else {
 181                         c->irq_status += I2O_MOTOROLA_PORT_OFFSET;
 182                         c->irq_mask += I2O_MOTOROLA_PORT_OFFSET;
 183                         c->in_port += I2O_MOTOROLA_PORT_OFFSET;
 184                         c->out_port += I2O_MOTOROLA_PORT_OFFSET;
 185                         printk(KERN_INFO "%s: MPC82XX workarounds activated.\n",
 186                                c->name);
 187                 }
 188         }
 189
 190         if (i2o_dma_alloc(dev, &c->status, 8)) {
 191                 i2o_pci_free(c);
 192                 return -ENOMEM;
 193         }
 194
 195         if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt))) {
 196                 i2o_pci_free(c);
 197                 return -ENOMEM;
 198         }
 199
 200         if (i2o_dma_alloc(dev, &c->dlct, 8192)) {
 201                 i2o_pci_free(c);
 202                 return -ENOMEM;
 203         }
 204
 205         if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block))) {
 206                 i2o_pci_free(c);
 207                 return -ENOMEM;
 208         }
 209
 210         if (i2o_dma_alloc(dev, &c->out_queue,
 211                 I2O_MAX_OUTBOUND_MSG_FRAMES * I2O_OUTBOUND_MSG_FRAME_SIZE *
 212                                 sizeof(u32))) {
 213                 i2o_pci_free(c);
 214                 return -ENOMEM;
 215         }
 216
 217         pci_set_drvdata(pdev, c);
 218
 219         return 0;
 220 }
 221
 222 /**
 223  *      i2o_pci_interrupt - Interrupt handler for I2O controller
 224  *      @irq: interrupt line
 225  *      @dev_id: pointer to the I2O controller
 226  *
 227  *      Handle an interrupt from a PCI based I2O controller. This turns out
 228  *      to be rather simple. We keep the controller pointer in the cookie.
 229  */
 230 static irqreturn_t i2o_pci_interrupt(int irq, void *dev_id)
 231 {
 232         struct i2o_controller *c = dev_id;
 233         u32 m;
 234         irqreturn_t rc = IRQ_NONE;
 235
 236         while (readl(c->irq_status) & I2O_IRQ_OUTBOUND_POST) {
 237                 m = readl(c->out_port);
 238                 if (m == I2O_QUEUE_EMPTY) {
 239                         /*
 240                          * Old 960 steppings had a bug in the I2O unit that
 241                          * caused the queue to appear empty when it wasn't.
 242                          */
 243                         m = readl(c->out_port);
 244                         if (unlikely(m == I2O_QUEUE_EMPTY))
 245                                 break;
 246                 }
 247
 248                 /* dispatch it */
 249                 if (i2o_driver_dispatch(c, m))
 250                         /* flush it if result != 0 */
 251                         i2o_flush_reply(c, m);
 252
 253                 rc = IRQ_HANDLED;
 254         }
 255
 256         return rc;
 257 }
 258
 259 /**
 260  *      i2o_pci_irq_enable - Allocate interrupt for I2O controller
 261  *      @c: i2o_controller that the request is for
 262  *
 263  *      Allocate an interrupt for the I2O controller, and activate interrupts
 264  *      on the I2O controller.
 265  *
 266  *      Returns 0 on success or negative error code on failure.
 267  */
 268 static int i2o_pci_irq_enable(struct i2o_controller *c)
 269 {
 270         struct pci_dev *pdev = c->pdev;
 271         int rc;
 272
 273         writel(0xffffffff, c->irq_mask);
 274
 275         if (pdev->irq) {
 276                 rc = request_irq(pdev->irq, i2o_pci_interrupt, IRQF_SHARED,
 277                                  c->name, c);
 278                 if (rc < 0) {
 279                         printk(KERN_ERR "%s: unable to allocate interrupt %d."
 280                                "\n", c->name, pdev->irq);
 281                         return rc;
 282                 }
 283         }
 284
 285         writel(0x00000000, c->irq_mask);
 286
 287         printk(KERN_INFO "%s: Installed at IRQ %d\n", c->name, pdev->irq);
 288
 289         return 0;
 290 }
 291
 292 /**
 293  *      i2o_pci_irq_disable - Free interrupt for I2O controller
 294  *      @c: I2O controller
 295  *
 296  *      Disable interrupts in I2O controller and then free interrupt.
 297  */
 298 static void i2o_pci_irq_disable(struct i2o_controller *c)
 299 {
 300         writel(0xffffffff, c->irq_mask);
 301
 302         if (c->pdev->irq > 0)
 303                 free_irq(c->pdev->irq, c);
 304 }
 305
 306 /**
 307  *      i2o_pci_probe - Probe the PCI device for an I2O controller
 308  *      @pdev: PCI device to test
 309  *      @id: id which matched with the PCI device id table
 310  *
 311  *      Probe the PCI device for any device which is a memory of the
 312  *      Intelligent, I2O class or an Adaptec Zero Channel Controller. We
 313  *      attempt to set up each such device and register it with the core.
 314  *
 315  *      Returns 0 on success or negative error code on failure.
 316  */
 317 static int __devinit i2o_pci_probe(struct pci_dev *pdev,
 318                                    const struct pci_device_id *id)
 319 {
 320         struct i2o_controller *c;
 321         int rc;
 322         struct pci_dev *i960 = NULL;
 323
 324         printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n");
 325
 326         if ((pdev->class & 0xff) > 1) {
 327                 printk(KERN_WARNING "i2o: %s does not support I2O 1.5 "
 328                        "(skipping).\n", pci_name(pdev));
 329                 return -ENODEV;
 330         }
 331
 332         if ((rc = pci_enable_device(pdev))) {
 333                 printk(KERN_WARNING "i2o: couldn't enable device %s\n",
 334                        pci_name(pdev));
 335                 return rc;
 336         }
 337
 338         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
 339                 printk(KERN_WARNING "i2o: no suitable DMA found for %s\n",
 340                        pci_name(pdev));
 341                 rc = -ENODEV;
 342                 goto disable;
 343         }
 344
 345         pci_set_master(pdev);
 346
 347         c = i2o_iop_alloc();
 348         if (IS_ERR(c)) {
 349                 printk(KERN_ERR "i2o: couldn't allocate memory for %s\n",
 350                        pci_name(pdev));
 351                 rc = PTR_ERR(c);
 352                 goto disable;
 353         } else
 354                 printk(KERN_INFO "%s: controller found (%s)\n", c->name,
 355                        pci_name(pdev));
 356
 357         c->pdev = pdev;
 358         c->device.parent = &pdev->dev;
 359
 360         /* Cards that fall apart if you hit them with large I/O loads... */
 361         if (pdev->vendor == PCI_VENDOR_ID_NCR && pdev->device == 0x0630) {
 362                 c->short_req = 1;
 363                 printk(KERN_INFO "%s: Symbios FC920 workarounds activated.\n",
 364                        c->name);
 365         }
 366
 367         if (pdev->subsystem_vendor == PCI_VENDOR_ID_PROMISE) {
 368                 /*
 369                  * Expose the ship behind i960 for initialization, or it will
 370                  * failed
 371                  */
 372                 i960 = pci_get_slot(c->pdev->bus,
 373                                   PCI_DEVFN(PCI_SLOT(c->pdev->devfn), 0));
 374
 375                 if (i960) {
 376                         pci_write_config_word(i960, 0x42, 0);
 377                         pci_dev_put(i960);
 378                 }
 379
 380                 c->promise = 1;
 381                 c->limit_sectors = 1;
 382         }
 383
 384         if (pdev->subsystem_vendor == PCI_VENDOR_ID_DPT)
 385                 c->adaptec = 1;
 386
 387         /* Cards that go bananas if you quiesce them before you reset them. */
 388         if (pdev->vendor == PCI_VENDOR_ID_DPT) {
 389                 c->no_quiesce = 1;
 390                 if (pdev->device == 0xa511)
 391                         c->raptor = 1;
 392
 393                 if (pdev->subsystem_device == 0xc05a) {
 394                         c->limit_sectors = 1;
 395                         printk(KERN_INFO
 396                                "%s: limit sectors per request to %d\n", c->name,
 397                                I2O_MAX_SECTORS_LIMITED);
 398                 }
 399 #ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
 400                 if (sizeof(dma_addr_t) > 4) {
 401                         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
 402                                 printk(KERN_INFO "%s: 64-bit DMA unavailable\n",
 403                                        c->name);
 404                         else {
 405                                 c->pae_support = 1;
 406                                 printk(KERN_INFO "%s: using 64-bit DMA\n",
 407                                        c->name);
 408                         }
 409                 }
 410 #endif
 411         }
 412
 413         if ((rc = i2o_pci_alloc(c))) {
 414                 printk(KERN_ERR "%s: DMA / IO allocation for I2O controller "
 415                        "failed\n", c->name);
 416                 goto free_controller;
 417         }
 418
 419         if (i2o_pci_irq_enable(c)) {
 420                 printk(KERN_ERR "%s: unable to enable interrupts for I2O "
 421                        "controller\n", c->name);
 422                 goto free_pci;
 423         }
 424
 425         if ((rc = i2o_iop_add(c)))
 426                 goto uninstall;
 427
 428         if (i960)
 429                 pci_write_config_word(i960, 0x42, 0x03ff);
 430
 431         return 0;
 432
 433       uninstall:
 434         i2o_pci_irq_disable(c);
 435
 436       free_pci:
 437         i2o_pci_free(c);
 438
 439       free_controller:
 440         i2o_iop_free(c);
 441
 442       disable:
 443         pci_disable_device(pdev);
 444
 445         return rc;
 446 }
 447
 448 /**
 449  *      i2o_pci_remove - Removes a I2O controller from the system
 450  *      @pdev: I2O controller which should be removed
 451  *
 452  *      Reset the I2O controller, disable interrupts and remove all allocated
 453  *      resources.
 454  */
 455 static void __devexit i2o_pci_remove(struct pci_dev *pdev)
 456 {
 457         struct i2o_controller *c;
 458         c = pci_get_drvdata(pdev);
 459
 460         i2o_iop_remove(c);
 461         i2o_pci_irq_disable(c);
 462         i2o_pci_free(c);
 463
 464         pci_disable_device(pdev);
 465
 466         printk(KERN_INFO "%s: Controller removed.\n", c->name);
 467
 468         put_device(&c->device);
 469 };
 470
 471 /* PCI driver for I2O controller */
 472 static struct pci_driver i2o_pci_driver = {
 473         .name = "PCI_I2O",
 474         .id_table = i2o_pci_ids,
 475         .probe = i2o_pci_probe,
 476         .remove = __devexit_p(i2o_pci_remove),
 477 };
 478
 479 /**
 480  *      i2o_pci_init - registers I2O PCI driver in PCI subsystem
 481  *
 482  *      Returns > 0 on success or negative error code on failure.
 483  */
 484 int __init i2o_pci_init(void)
 485 {
 486         return pci_register_driver(&i2o_pci_driver);
 487 };
 488
 489 /**
 490  *      i2o_pci_exit - unregisters I2O PCI driver from PCI subsystem
 491  */
 492 void __exit i2o_pci_exit(void)
 493 {
 494         pci_unregister_driver(&i2o_pci_driver);
 495 };
 496
 497 MODULE_DEVICE_TABLE(pci, i2o_pci_ids);