kernel/drivers/staging/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 "i2o.h"
  34 #include <linux/module.h>
  35 #include "core.h"
  36
  37 #define OSM_DESCRIPTION "I2O-subsystem"
  38
  39 /* PCI device id table for all I2O controllers */
  40 static struct pci_device_id i2o_pci_ids[] = {
  41         {PCI_DEVICE_CLASS(PCI_CLASS_INTELLIGENT_I2O << 8, 0xffff00)},
  42         {PCI_DEVICE(PCI_VENDOR_ID_DPT, 0xa511)},
  43         {.vendor = PCI_VENDOR_ID_INTEL,.device = 0x1962,
  44          .subvendor = PCI_VENDOR_ID_PROMISE,.subdevice = PCI_ANY_ID},
  45         {0}
  46 };
  47
  48 /**
  49  *      i2o_pci_free - Frees the DMA memory for the I2O controller
  50  *      @c: I2O controller to free
  51  *
  52  *      Remove all allocated DMA memory and unmap memory IO regions. If MTRR
  53  *      is enabled, also remove it again.
  54  */
  55 static void i2o_pci_free(struct i2o_controller *c)
  56 {
  57         struct device *dev;
  58
  59         dev = &c->pdev->dev;
  60
  61         i2o_dma_free(dev, &c->out_queue);
  62         i2o_dma_free(dev, &c->status_block);
  63         kfree(c->lct);
  64         i2o_dma_free(dev, &c->dlct);
  65         i2o_dma_free(dev, &c->hrt);
  66         i2o_dma_free(dev, &c->status);
  67
  68         if (c->raptor && c->in_queue.virt)
  69                 iounmap(c->in_queue.virt);
  70
  71         if (c->base.virt)
  72                 iounmap(c->base.virt);
  73
  74         pci_release_regions(c->pdev);
  75 }
  76
  77 /**
  78  *      i2o_pci_alloc - Allocate DMA memory, map IO memory for I2O controller
  79  *      @c: I2O controller
  80  *
  81  *      Allocate DMA memory for a PCI (or in theory AGP) I2O controller. All
  82  *      IO mappings are also done here. If MTRR is enabled, also do add memory
  83  *      regions here.
  84  *
  85  *      Returns 0 on success or negative error code on failure.
  86  */
  87 static int i2o_pci_alloc(struct i2o_controller *c)
  88 {
  89         struct pci_dev *pdev = c->pdev;
  90         struct device *dev = &pdev->dev;
  91         int i;
  92
  93         if (pci_request_regions(pdev, OSM_DESCRIPTION)) {
  94                 printk(KERN_ERR "%s: device already claimed\n", c->name);
  95                 return -ENODEV;
  96         }
  97
  98         for (i = 0; i < 6; i++) {
  99                 /* Skip I/O spaces */
 100                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
 101                         if (!c->base.phys) {
 102                                 c->base.phys = pci_resource_start(pdev, i);
 103                                 c->base.len = pci_resource_len(pdev, i);
 104
 105                                 /*
 106                                  * If we know what card it is, set the size
 107                                  * correctly. Code is taken from dpt_i2o.c
 108                                  */
 109                                 if (pdev->device == 0xa501) {
 110                                         if (pdev->subsystem_device >= 0xc032 &&
 111                                             pdev->subsystem_device <= 0xc03b) {
 112                                                 if (c->base.len > 0x400000)
 113                                                         c->base.len = 0x400000;
 114                                         } else {
 115                                                 if (c->base.len > 0x100000)
 116                                                         c->base.len = 0x100000;
 117                                         }
 118                                 }
 119                                 if (!c->raptor)
 120                                         break;
 121                         } else {
 122                                 c->in_queue.phys = pci_resource_start(pdev, i);
 123                                 c->in_queue.len = pci_resource_len(pdev, i);
 124                                 break;
 125                         }
 126                 }
 127         }
 128
 129         if (i == 6) {
 130                 printk(KERN_ERR "%s: I2O controller has no memory regions"
 131                        " defined.\n", c->name);
 132                 i2o_pci_free(c);
 133                 return -EINVAL;
 134         }
 135
 136         /* Map the I2O controller */
 137         if (c->raptor) {
 138                 printk(KERN_INFO "%s: PCI I2O controller\n", c->name);
 139                 printk(KERN_INFO "     BAR0 at 0x%08lX size=%ld\n",
 140                        (unsigned long)c->base.phys, (unsigned long)c->base.len);
 141                 printk(KERN_INFO "     BAR1 at 0x%08lX size=%ld\n",
 142                        (unsigned long)c->in_queue.phys,
 143                        (unsigned long)c->in_queue.len);
 144         } else
 145                 printk(KERN_INFO "%s: PCI I2O controller at %08lX size=%ld\n",
 146                        c->name, (unsigned long)c->base.phys,
 147                        (unsigned long)c->base.len);
 148
 149         c->base.virt = ioremap_nocache(c->base.phys, c->base.len);
 150         if (!c->base.virt) {
 151                 printk(KERN_ERR "%s: Unable to map controller.\n", c->name);
 152                 i2o_pci_free(c);
 153                 return -ENOMEM;
 154         }
 155
 156         if (c->raptor) {
 157                 c->in_queue.virt =
 158                     ioremap_nocache(c->in_queue.phys, c->in_queue.len);
 159                 if (!c->in_queue.virt) {
 160                         printk(KERN_ERR "%s: Unable to map controller.\n",
 161                                c->name);
 162                         i2o_pci_free(c);
 163                         return -ENOMEM;
 164                 }
 165         } else
 166                 c->in_queue = c->base;
 167
 168         c->irq_status = c->base.virt + I2O_IRQ_STATUS;
 169         c->irq_mask = c->base.virt + I2O_IRQ_MASK;
 170         c->in_port = c->base.virt + I2O_IN_PORT;
 171         c->out_port = c->base.virt + I2O_OUT_PORT;
 172
 173         /* Motorola/Freescale chip does not follow spec */
 174         if (pdev->vendor == PCI_VENDOR_ID_MOTOROLA && pdev->device == 0x18c0) {
 175                 /* Check if CPU is enabled */
 176                 if (be32_to_cpu(readl(c->base.virt + 0x10000)) & 0x10000000) {
 177                         printk(KERN_INFO "%s: MPC82XX needs CPU running to "
 178                                "service I2O.\n", c->name);
 179                         i2o_pci_free(c);
 180                         return -ENODEV;
 181                 } else {
 182                         c->irq_status += I2O_MOTOROLA_PORT_OFFSET;
 183                         c->irq_mask += I2O_MOTOROLA_PORT_OFFSET;
 184                         c->in_port += I2O_MOTOROLA_PORT_OFFSET;
 185                         c->out_port += I2O_MOTOROLA_PORT_OFFSET;
 186                         printk(KERN_INFO "%s: MPC82XX workarounds activated.\n",
 187                                c->name);
 188                 }
 189         }
 190
 191         if (i2o_dma_alloc(dev, &c->status, 8)) {
 192                 i2o_pci_free(c);
 193                 return -ENOMEM;
 194         }
 195
 196         if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt))) {
 197                 i2o_pci_free(c);
 198                 return -ENOMEM;
 199         }
 200
 201         if (i2o_dma_alloc(dev, &c->dlct, 8192)) {
 202                 i2o_pci_free(c);
 203                 return -ENOMEM;
 204         }
 205
 206         if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block))) {
 207                 i2o_pci_free(c);
 208                 return -ENOMEM;
 209         }
 210
 211         if (i2o_dma_alloc(dev, &c->out_queue,
 212                 I2O_MAX_OUTBOUND_MSG_FRAMES * I2O_OUTBOUND_MSG_FRAME_SIZE *
 213                                 sizeof(u32))) {
 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  *
 228  *      Handle an interrupt from a PCI based I2O controller. This turns out
 229  *      to be rather simple. We keep the controller pointer in the cookie.
 230  */
 231 static irqreturn_t i2o_pci_interrupt(int irq, void *dev_id)
 232 {
 233         struct i2o_controller *c = dev_id;
 234         u32 m;
 235         irqreturn_t rc = IRQ_NONE;
 236
 237         while (readl(c->irq_status) & I2O_IRQ_OUTBOUND_POST) {
 238                 m = readl(c->out_port);
 239                 if (m == I2O_QUEUE_EMPTY) {
 240                         /*
 241                          * Old 960 steppings had a bug in the I2O unit that
 242                          * caused the queue to appear empty when it wasn't.
 243                          */
 244                         m = readl(c->out_port);
 245                         if (unlikely(m == I2O_QUEUE_EMPTY))
 246                                 break;
 247                 }
 248
 249                 /* dispatch it */
 250                 if (i2o_driver_dispatch(c, m))
 251                         /* flush it if result != 0 */
 252                         i2o_flush_reply(c, m);
 253
 254                 rc = IRQ_HANDLED;
 255         }
 256
 257         return rc;
 258 }
 259
 260 /**
 261  *      i2o_pci_irq_enable - Allocate interrupt for I2O controller
 262  *      @c: i2o_controller that the request is for
 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  *      @pdev: 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 i2o_pci_probe(struct pci_dev *pdev, 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         rc = pci_enable_device(pdev);
 333         if (rc) {
 334                 printk(KERN_WARNING "i2o: couldn't enable device %s\n",
 335                        pci_name(pdev));
 336                 return rc;
 337         }
 338
 339         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
 340                 printk(KERN_WARNING "i2o: no suitable DMA found for %s\n",
 341                        pci_name(pdev));
 342                 rc = -ENODEV;
 343                 goto disable;
 344         }
 345
 346         pci_set_master(pdev);
 347
 348         c = i2o_iop_alloc();
 349         if (IS_ERR(c)) {
 350                 printk(KERN_ERR "i2o: couldn't allocate memory for %s\n",
 351                        pci_name(pdev));
 352                 rc = PTR_ERR(c);
 353                 goto disable;
 354         } else
 355                 printk(KERN_INFO "%s: controller found (%s)\n", c->name,
 356                        pci_name(pdev));
 357
 358         c->pdev = pdev;
 359         c->device.parent = &pdev->dev;
 360
 361         /* Cards that fall apart if you hit them with large I/O loads... */
 362         if (pdev->vendor == PCI_VENDOR_ID_NCR && pdev->device == 0x0630) {
 363                 c->short_req = 1;
 364                 printk(KERN_INFO "%s: Symbios FC920 workarounds activated.\n",
 365                        c->name);
 366         }
 367
 368         if (pdev->subsystem_vendor == PCI_VENDOR_ID_PROMISE) {
 369                 /*
 370                  * Expose the ship behind i960 for initialization, or it will
 371                  * failed
 372                  */
 373                 i960 = pci_get_slot(c->pdev->bus,
 374                                   PCI_DEVFN(PCI_SLOT(c->pdev->devfn), 0));
 375
 376                 if (i960) {
 377                         pci_write_config_word(i960, 0x42, 0);
 378                         pci_dev_put(i960);
 379                 }
 380
 381                 c->promise = 1;
 382                 c->limit_sectors = 1;
 383         }
 384
 385         if (pdev->subsystem_vendor == PCI_VENDOR_ID_DPT)
 386                 c->adaptec = 1;
 387
 388         /* Cards that go bananas if you quiesce them before you reset them. */
 389         if (pdev->vendor == PCI_VENDOR_ID_DPT) {
 390                 c->no_quiesce = 1;
 391                 if (pdev->device == 0xa511)
 392                         c->raptor = 1;
 393
 394                 if (pdev->subsystem_device == 0xc05a) {
 395                         c->limit_sectors = 1;
 396                         printk(KERN_INFO
 397                                "%s: limit sectors per request to %d\n", c->name,
 398                                I2O_MAX_SECTORS_LIMITED);
 399                 }
 400 #ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
 401                 if (sizeof(dma_addr_t) > 4) {
 402                         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
 403                                 printk(KERN_INFO "%s: 64-bit DMA unavailable\n",
 404                                        c->name);
 405                         else {
 406                                 c->pae_support = 1;
 407                                 printk(KERN_INFO "%s: using 64-bit DMA\n",
 408                                        c->name);
 409                         }
 410                 }
 411 #endif
 412         }
 413
 414         rc = i2o_pci_alloc(c);
 415         if (rc) {
 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         rc = i2o_iop_add(c);
 428         if (rc)
 429                 goto uninstall;
 430
 431         if (i960)
 432                 pci_write_config_word(i960, 0x42, 0x03ff);
 433
 434         return 0;
 435
 436       uninstall:
 437         i2o_pci_irq_disable(c);
 438
 439       free_pci:
 440         i2o_pci_free(c);
 441
 442       free_controller:
 443         i2o_iop_free(c);
 444
 445       disable:
 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 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 = 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);