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