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