arch/powerpc/sysdev/fsl_msi.c

   1 /*
   2  * Copyright (C) 2007-2011 Freescale Semiconductor, Inc.
   3  *
   4  * Author: Tony Li <tony.li@freescale.com>
   5  *         Jason Jin <Jason.jin@freescale.com>
   6  *
   7  * The hwirq alloc and free code reuse from sysdev/mpic_msi.c
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; version 2 of the
  12  * License.
  13  *
  14  */
  15 #include <linux/irq.h>
  16 #include <linux/msi.h>
  17 #include <linux/pci.h>
  18 #include <linux/slab.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/seq_file.h>
  22 #include <sysdev/fsl_soc.h>
  23 #include <asm/prom.h>
  24 #include <asm/hw_irq.h>
  25 #include <asm/ppc-pci.h>
  26 #include <asm/mpic.h>
  27 #include <asm/fsl_hcalls.h>
  28
  29 #include "fsl_msi.h"
  30 #include "fsl_pci.h"
  31
  32 #define MSIIR_OFFSET_MASK       0xfffff
  33 #define MSIIR_IBS_SHIFT         0
  34 #define MSIIR_SRS_SHIFT         5
  35 #define MSIIR1_IBS_SHIFT        4
  36 #define MSIIR1_SRS_SHIFT        0
  37 #define MSI_SRS_MASK            0xf
  38 #define MSI_IBS_MASK            0x1f
  39
  40 #define msi_hwirq(msi, msir_index, intr_index) \
  41                 ((msir_index) << (msi)->srs_shift | \
  42                  ((intr_index) << (msi)->ibs_shift))
  43
  44 static LIST_HEAD(msi_head);
  45
  46 struct fsl_msi_feature {
  47         u32 fsl_pic_ip;
  48         u32 msiir_offset; /* Offset of MSIIR, relative to start of MSIR bank */
  49 };
  50
  51 struct fsl_msi_cascade_data {
  52         struct fsl_msi *msi_data;
  53         int index;
  54         int virq;
  55 };
  56
  57 static inline u32 fsl_msi_read(u32 __iomem *base, unsigned int reg)
  58 {
  59         return in_be32(base + (reg >> 2));
  60 }
  61
  62 /*
  63  * We do not need this actually. The MSIR register has been read once
  64  * in the cascade interrupt. So, this MSI interrupt has been acked
  65 */
  66 static void fsl_msi_end_irq(struct irq_data *d)
  67 {
  68 }
  69
  70 static void fsl_msi_print_chip(struct irq_data *irqd, struct seq_file *p)
  71 {
  72         struct fsl_msi *msi_data = irqd->domain->host_data;
  73         irq_hw_number_t hwirq = irqd_to_hwirq(irqd);
  74         int cascade_virq, srs;
  75
  76         srs = (hwirq >> msi_data->srs_shift) & MSI_SRS_MASK;
  77         cascade_virq = msi_data->cascade_array[srs]->virq;
  78
  79         seq_printf(p, " fsl-msi-%d", cascade_virq);
  80 }
  81
  82
  83 static struct irq_chip fsl_msi_chip = {
  84         .irq_mask       = pci_msi_mask_irq,
  85         .irq_unmask     = pci_msi_unmask_irq,
  86         .irq_ack        = fsl_msi_end_irq,
  87         .irq_print_chip = fsl_msi_print_chip,
  88 };
  89
  90 static int fsl_msi_host_map(struct irq_domain *h, unsigned int virq,
  91                                 irq_hw_number_t hw)
  92 {
  93         struct fsl_msi *msi_data = h->host_data;
  94         struct irq_chip *chip = &fsl_msi_chip;
  95
  96         irq_set_status_flags(virq, IRQ_TYPE_EDGE_FALLING);
  97
  98         irq_set_chip_data(virq, msi_data);
  99         irq_set_chip_and_handler(virq, chip, handle_edge_irq);
 100
 101         return 0;
 102 }
 103
 104 static const struct irq_domain_ops fsl_msi_host_ops = {
 105         .map = fsl_msi_host_map,
 106 };
 107
 108 static int fsl_msi_init_allocator(struct fsl_msi *msi_data)
 109 {
 110         int rc, hwirq;
 111
 112         rc = msi_bitmap_alloc(&msi_data->bitmap, NR_MSI_IRQS_MAX,
 113                               irq_domain_get_of_node(msi_data->irqhost));
 114         if (rc)
 115                 return rc;
 116
 117         /*
 118          * Reserve all the hwirqs
 119          * The available hwirqs will be released in fsl_msi_setup_hwirq()
 120          */
 121         for (hwirq = 0; hwirq < NR_MSI_IRQS_MAX; hwirq++)
 122                 msi_bitmap_reserve_hwirq(&msi_data->bitmap, hwirq);
 123
 124         return 0;
 125 }
 126
 127 static void fsl_teardown_msi_irqs(struct pci_dev *pdev)
 128 {
 129         struct msi_desc *entry;
 130         struct fsl_msi *msi_data;
 131         irq_hw_number_t hwirq;
 132
 133         for_each_pci_msi_entry(entry, pdev) {
 134                 if (!entry->irq)
 135                         continue;
 136                 hwirq = virq_to_hw(entry->irq);
 137                 msi_data = irq_get_chip_data(entry->irq);
 138                 irq_set_msi_desc(entry->irq, NULL);
 139                 irq_dispose_mapping(entry->irq);
 140                 msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1);
 141         }
 142
 143         return;
 144 }
 145
 146 static void fsl_compose_msi_msg(struct pci_dev *pdev, int hwirq,
 147                                 struct msi_msg *msg,
 148                                 struct fsl_msi *fsl_msi_data)
 149 {
 150         struct fsl_msi *msi_data = fsl_msi_data;
 151         struct pci_controller *hose = pci_bus_to_host(pdev->bus);
 152         u64 address; /* Physical address of the MSIIR */
 153         int len;
 154         const __be64 *reg;
 155
 156         /* If the msi-address-64 property exists, then use it */
 157         reg = of_get_property(hose->dn, "msi-address-64", &len);
 158         if (reg && (len == sizeof(u64)))
 159                 address = be64_to_cpup(reg);
 160         else
 161                 address = fsl_pci_immrbar_base(hose) + msi_data->msiir_offset;
 162
 163         msg->address_lo = lower_32_bits(address);
 164         msg->address_hi = upper_32_bits(address);
 165
 166         /*
 167          * MPIC version 2.0 has erratum PIC1. It causes
 168          * that neither MSI nor MSI-X can work fine.
 169          * This is a workaround to allow MSI-X to function
 170          * properly. It only works for MSI-X, we prevent
 171          * MSI on buggy chips in fsl_setup_msi_irqs().
 172          */
 173         if (msi_data->feature & MSI_HW_ERRATA_ENDIAN)
 174                 msg->data = __swab32(hwirq);
 175         else
 176                 msg->data = hwirq;
 177
 178         pr_debug("%s: allocated srs: %d, ibs: %d\n", __func__,
 179                  (hwirq >> msi_data->srs_shift) & MSI_SRS_MASK,
 180                  (hwirq >> msi_data->ibs_shift) & MSI_IBS_MASK);
 181 }
 182
 183 static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
 184 {
 185         struct pci_controller *hose = pci_bus_to_host(pdev->bus);
 186         struct device_node *np;
 187         phandle phandle = 0;
 188         int rc, hwirq = -ENOMEM;
 189         unsigned int virq;
 190         struct msi_desc *entry;
 191         struct msi_msg msg;
 192         struct fsl_msi *msi_data;
 193
 194         if (type == PCI_CAP_ID_MSI) {
 195                 /*
 196                  * MPIC version 2.0 has erratum PIC1. For now MSI
 197                  * could not work. So check to prevent MSI from
 198                  * being used on the board with this erratum.
 199                  */
 200                 list_for_each_entry(msi_data, &msi_head, list)
 201                         if (msi_data->feature & MSI_HW_ERRATA_ENDIAN)
 202                                 return -EINVAL;
 203         }
 204
 205         /*
 206          * If the PCI node has an fsl,msi property, then we need to use it
 207          * to find the specific MSI.
 208          */
 209         np = of_parse_phandle(hose->dn, "fsl,msi", 0);
 210         if (np) {
 211                 if (of_device_is_compatible(np, "fsl,mpic-msi") ||
 212                     of_device_is_compatible(np, "fsl,vmpic-msi") ||
 213                     of_device_is_compatible(np, "fsl,vmpic-msi-v4.3"))
 214                         phandle = np->phandle;
 215                 else {
 216                         dev_err(&pdev->dev,
 217                                 "node %pOF has an invalid fsl,msi phandle %u\n",
 218                                 hose->dn, np->phandle);
 219                         return -EINVAL;
 220                 }
 221         }
 222
 223         for_each_pci_msi_entry(entry, pdev) {
 224                 /*
 225                  * Loop over all the MSI devices until we find one that has an
 226                  * available interrupt.
 227                  */
 228                 list_for_each_entry(msi_data, &msi_head, list) {
 229                         /*
 230                          * If the PCI node has an fsl,msi property, then we
 231                          * restrict our search to the corresponding MSI node.
 232                          * The simplest way is to skip over MSI nodes with the
 233                          * wrong phandle. Under the Freescale hypervisor, this
 234                          * has the additional benefit of skipping over MSI
 235                          * nodes that are not mapped in the PAMU.
 236                          */
 237                         if (phandle && (phandle != msi_data->phandle))
 238                                 continue;
 239
 240                         hwirq = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);
 241                         if (hwirq >= 0)
 242                                 break;
 243                 }
 244
 245                 if (hwirq < 0) {
 246                         rc = hwirq;
 247                         dev_err(&pdev->dev, "could not allocate MSI interrupt\n");
 248                         goto out_free;
 249                 }
 250
 251                 virq = irq_create_mapping(msi_data->irqhost, hwirq);
 252
 253                 if (!virq) {
 254                         dev_err(&pdev->dev, "fail mapping hwirq %i\n", hwirq);
 255                         msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1);
 256                         rc = -ENOSPC;
 257                         goto out_free;
 258                 }
 259                 /* chip_data is msi_data via host->hostdata in host->map() */
 260                 irq_set_msi_desc(virq, entry);
 261
 262                 fsl_compose_msi_msg(pdev, hwirq, &msg, msi_data);
 263                 pci_write_msi_msg(virq, &msg);
 264         }
 265         return 0;
 266
 267 out_free:
 268         /* free by the caller of this function */
 269         return rc;
 270 }
 271
 272 static irqreturn_t fsl_msi_cascade(int irq, void *data)
 273 {
 274         unsigned int cascade_irq;
 275         struct fsl_msi *msi_data;
 276         int msir_index = -1;
 277         u32 msir_value = 0;
 278         u32 intr_index;
 279         u32 have_shift = 0;
 280         struct fsl_msi_cascade_data *cascade_data = data;
 281         irqreturn_t ret = IRQ_NONE;
 282
 283         msi_data = cascade_data->msi_data;
 284
 285         msir_index = cascade_data->index;
 286
 287         if (msir_index >= NR_MSI_REG_MAX)
 288                 cascade_irq = 0;
 289
 290         switch (msi_data->feature & FSL_PIC_IP_MASK) {
 291         case FSL_PIC_IP_MPIC:
 292                 msir_value = fsl_msi_read(msi_data->msi_regs,
 293                         msir_index * 0x10);
 294                 break;
 295         case FSL_PIC_IP_IPIC:
 296                 msir_value = fsl_msi_read(msi_data->msi_regs, msir_index * 0x4);
 297                 break;
 298 #ifdef CONFIG_EPAPR_PARAVIRT
 299         case FSL_PIC_IP_VMPIC: {
 300                 unsigned int ret;
 301                 ret = fh_vmpic_get_msir(virq_to_hw(irq), &msir_value);
 302                 if (ret) {
 303                         pr_err("fsl-msi: fh_vmpic_get_msir() failed for "
 304                                "irq %u (ret=%u)\n", irq, ret);
 305                         msir_value = 0;
 306                 }
 307                 break;
 308         }
 309 #endif
 310         }
 311
 312         while (msir_value) {
 313                 intr_index = ffs(msir_value) - 1;
 314
 315                 cascade_irq = irq_linear_revmap(msi_data->irqhost,
 316                                 msi_hwirq(msi_data, msir_index,
 317                                           intr_index + have_shift));
 318                 if (cascade_irq) {
 319                         generic_handle_irq(cascade_irq);
 320                         ret = IRQ_HANDLED;
 321                 }
 322                 have_shift += intr_index + 1;
 323                 msir_value = msir_value >> (intr_index + 1);
 324         }
 325
 326         return ret;
 327 }
 328
 329 static int fsl_of_msi_remove(struct platform_device *ofdev)
 330 {
 331         struct fsl_msi *msi = platform_get_drvdata(ofdev);
 332         int virq, i;
 333
 334         if (msi->list.prev != NULL)
 335                 list_del(&msi->list);
 336         for (i = 0; i < NR_MSI_REG_MAX; i++) {
 337                 if (msi->cascade_array[i]) {
 338                         virq = msi->cascade_array[i]->virq;
 339
 340                         BUG_ON(!virq);
 341
 342                         free_irq(virq, msi->cascade_array[i]);
 343                         kfree(msi->cascade_array[i]);
 344                         irq_dispose_mapping(virq);
 345                 }
 346         }
 347         if (msi->bitmap.bitmap)
 348                 msi_bitmap_free(&msi->bitmap);
 349         if ((msi->feature & FSL_PIC_IP_MASK) != FSL_PIC_IP_VMPIC)
 350                 iounmap(msi->msi_regs);
 351         kfree(msi);
 352
 353         return 0;
 354 }
 355
 356 static struct lock_class_key fsl_msi_irq_class;
 357
 358 static int fsl_msi_setup_hwirq(struct fsl_msi *msi, struct platform_device *dev,
 359                                int offset, int irq_index)
 360 {
 361         struct fsl_msi_cascade_data *cascade_data = NULL;
 362         int virt_msir, i, ret;
 363
 364         virt_msir = irq_of_parse_and_map(dev->dev.of_node, irq_index);
 365         if (!virt_msir) {
 366                 dev_err(&dev->dev, "%s: Cannot translate IRQ index %d\n",
 367                         __func__, irq_index);
 368                 return 0;
 369         }
 370
 371         cascade_data = kzalloc(sizeof(struct fsl_msi_cascade_data), GFP_KERNEL);
 372         if (!cascade_data) {
 373                 dev_err(&dev->dev, "No memory for MSI cascade data\n");
 374                 return -ENOMEM;
 375         }
 376         irq_set_lockdep_class(virt_msir, &fsl_msi_irq_class);
 377         cascade_data->index = offset;
 378         cascade_data->msi_data = msi;
 379         cascade_data->virq = virt_msir;
 380         msi->cascade_array[irq_index] = cascade_data;
 381
 382         ret = request_irq(virt_msir, fsl_msi_cascade, IRQF_NO_THREAD,
 383                           "fsl-msi-cascade", cascade_data);
 384         if (ret) {
 385                 dev_err(&dev->dev, "failed to request_irq(%d), ret = %d\n",
 386                         virt_msir, ret);
 387                 return ret;
 388         }
 389
 390         /* Release the hwirqs corresponding to this MSI register */
 391         for (i = 0; i < IRQS_PER_MSI_REG; i++)
 392                 msi_bitmap_free_hwirqs(&msi->bitmap,
 393                                        msi_hwirq(msi, offset, i), 1);
 394
 395         return 0;
 396 }
 397
 398 static const struct of_device_id fsl_of_msi_ids[];
 399 static int fsl_of_msi_probe(struct platform_device *dev)
 400 {
 401         const struct of_device_id *match;
 402         struct fsl_msi *msi;
 403         struct resource res, msiir;
 404         int err, i, j, irq_index, count;
 405         const u32 *p;
 406         const struct fsl_msi_feature *features;
 407         int len;
 408         u32 offset;
 409         struct pci_controller *phb;
 410
 411         match = of_match_device(fsl_of_msi_ids, &dev->dev);
 412         if (!match)
 413                 return -EINVAL;
 414         features = match->data;
 415
 416         printk(KERN_DEBUG "Setting up Freescale MSI support\n");
 417
 418         msi = kzalloc(sizeof(struct fsl_msi), GFP_KERNEL);
 419         if (!msi) {
 420                 dev_err(&dev->dev, "No memory for MSI structure\n");
 421                 return -ENOMEM;
 422         }
 423         platform_set_drvdata(dev, msi);
 424
 425         msi->irqhost = irq_domain_add_linear(dev->dev.of_node,
 426                                       NR_MSI_IRQS_MAX, &fsl_msi_host_ops, msi);
 427
 428         if (msi->irqhost == NULL) {
 429                 dev_err(&dev->dev, "No memory for MSI irqhost\n");
 430                 err = -ENOMEM;
 431                 goto error_out;
 432         }
 433
 434         /*
 435          * Under the Freescale hypervisor, the msi nodes don't have a 'reg'
 436          * property.  Instead, we use hypercalls to access the MSI.
 437          */
 438         if ((features->fsl_pic_ip & FSL_PIC_IP_MASK) != FSL_PIC_IP_VMPIC) {
 439                 err = of_address_to_resource(dev->dev.of_node, 0, &res);
 440                 if (err) {
 441                         dev_err(&dev->dev, "invalid resource for node %pOF\n",
 442                                 dev->dev.of_node);
 443                         goto error_out;
 444                 }
 445
 446                 msi->msi_regs = ioremap(res.start, resource_size(&res));
 447                 if (!msi->msi_regs) {
 448                         err = -ENOMEM;
 449                         dev_err(&dev->dev, "could not map node %pOF\n",
 450                                 dev->dev.of_node);
 451                         goto error_out;
 452                 }
 453                 msi->msiir_offset =
 454                         features->msiir_offset + (res.start & 0xfffff);
 455
 456                 /*
 457                  * First read the MSIIR/MSIIR1 offset from dts
 458                  * On failure use the hardcode MSIIR offset
 459                  */
 460                 if (of_address_to_resource(dev->dev.of_node, 1, &msiir))
 461                         msi->msiir_offset = features->msiir_offset +
 462                                             (res.start & MSIIR_OFFSET_MASK);
 463                 else
 464                         msi->msiir_offset = msiir.start & MSIIR_OFFSET_MASK;
 465         }
 466
 467         msi->feature = features->fsl_pic_ip;
 468
 469         /* For erratum PIC1 on MPIC version 2.0*/
 470         if ((features->fsl_pic_ip & FSL_PIC_IP_MASK) == FSL_PIC_IP_MPIC
 471                         && (fsl_mpic_primary_get_version() == 0x0200))
 472                 msi->feature |= MSI_HW_ERRATA_ENDIAN;
 473
 474         /*
 475          * Remember the phandle, so that we can match with any PCI nodes
 476          * that have an "fsl,msi" property.
 477          */
 478         msi->phandle = dev->dev.of_node->phandle;
 479
 480         err = fsl_msi_init_allocator(msi);
 481         if (err) {
 482                 dev_err(&dev->dev, "Error allocating MSI bitmap\n");
 483                 goto error_out;
 484         }
 485
 486         p = of_get_property(dev->dev.of_node, "msi-available-ranges", &len);
 487
 488         if (of_device_is_compatible(dev->dev.of_node, "fsl,mpic-msi-v4.3") ||
 489             of_device_is_compatible(dev->dev.of_node, "fsl,vmpic-msi-v4.3")) {
 490                 msi->srs_shift = MSIIR1_SRS_SHIFT;
 491                 msi->ibs_shift = MSIIR1_IBS_SHIFT;
 492                 if (p)
 493                         dev_warn(&dev->dev, "%s: dose not support msi-available-ranges property\n",
 494                                 __func__);
 495
 496                 for (irq_index = 0; irq_index < NR_MSI_REG_MSIIR1;
 497                      irq_index++) {
 498                         err = fsl_msi_setup_hwirq(msi, dev,
 499                                                   irq_index, irq_index);
 500                         if (err)
 501                                 goto error_out;
 502                 }
 503         } else {
 504                 static const u32 all_avail[] =
 505                         { 0, NR_MSI_REG_MSIIR * IRQS_PER_MSI_REG };
 506
 507                 msi->srs_shift = MSIIR_SRS_SHIFT;
 508                 msi->ibs_shift = MSIIR_IBS_SHIFT;
 509
 510                 if (p && len % (2 * sizeof(u32)) != 0) {
 511                         dev_err(&dev->dev, "%s: Malformed msi-available-ranges property\n",
 512                                 __func__);
 513                         err = -EINVAL;
 514                         goto error_out;
 515                 }
 516
 517                 if (!p) {
 518                         p = all_avail;
 519                         len = sizeof(all_avail);
 520                 }
 521
 522                 for (irq_index = 0, i = 0; i < len / (2 * sizeof(u32)); i++) {
 523                         if (p[i * 2] % IRQS_PER_MSI_REG ||
 524                             p[i * 2 + 1] % IRQS_PER_MSI_REG) {
 525                                 pr_warn("%s: %pOF: msi available range of %u at %u is not IRQ-aligned\n",
 526                                        __func__, dev->dev.of_node,
 527                                        p[i * 2 + 1], p[i * 2]);
 528                                 err = -EINVAL;
 529                                 goto error_out;
 530                         }
 531
 532                         offset = p[i * 2] / IRQS_PER_MSI_REG;
 533                         count = p[i * 2 + 1] / IRQS_PER_MSI_REG;
 534
 535                         for (j = 0; j < count; j++, irq_index++) {
 536                                 err = fsl_msi_setup_hwirq(msi, dev, offset + j,
 537                                                           irq_index);
 538                                 if (err)
 539                                         goto error_out;
 540                         }
 541                 }
 542         }
 543
 544         list_add_tail(&msi->list, &msi_head);
 545
 546         /*
 547          * Apply the MSI ops to all the controllers.
 548          * It doesn't hurt to reassign the same ops,
 549          * but bail out if we find another MSI driver.
 550          */
 551         list_for_each_entry(phb, &hose_list, list_node) {
 552                 if (!phb->controller_ops.setup_msi_irqs) {
 553                         phb->controller_ops.setup_msi_irqs = fsl_setup_msi_irqs;
 554                         phb->controller_ops.teardown_msi_irqs = fsl_teardown_msi_irqs;
 555                 } else if (phb->controller_ops.setup_msi_irqs != fsl_setup_msi_irqs) {
 556                         dev_err(&dev->dev, "Different MSI driver already installed!\n");
 557                         err = -ENODEV;
 558                         goto error_out;
 559                 }
 560         }
 561         return 0;
 562 error_out:
 563         fsl_of_msi_remove(dev);
 564         return err;
 565 }
 566
 567 static const struct fsl_msi_feature mpic_msi_feature = {
 568         .fsl_pic_ip = FSL_PIC_IP_MPIC,
 569         .msiir_offset = 0x140,
 570 };
 571
 572 static const struct fsl_msi_feature ipic_msi_feature = {
 573         .fsl_pic_ip = FSL_PIC_IP_IPIC,
 574         .msiir_offset = 0x38,
 575 };
 576
 577 static const struct fsl_msi_feature vmpic_msi_feature = {
 578         .fsl_pic_ip = FSL_PIC_IP_VMPIC,
 579         .msiir_offset = 0,
 580 };
 581
 582 static const struct of_device_id fsl_of_msi_ids[] = {
 583         {
 584                 .compatible = "fsl,mpic-msi",
 585                 .data = &mpic_msi_feature,
 586         },
 587         {
 588                 .compatible = "fsl,mpic-msi-v4.3",
 589                 .data = &mpic_msi_feature,
 590         },
 591         {
 592                 .compatible = "fsl,ipic-msi",
 593                 .data = &ipic_msi_feature,
 594         },
 595 #ifdef CONFIG_EPAPR_PARAVIRT
 596         {
 597                 .compatible = "fsl,vmpic-msi",
 598                 .data = &vmpic_msi_feature,
 599         },
 600         {
 601                 .compatible = "fsl,vmpic-msi-v4.3",
 602                 .data = &vmpic_msi_feature,
 603         },
 604 #endif
 605         {}
 606 };
 607
 608 static struct platform_driver fsl_of_msi_driver = {
 609         .driver = {
 610                 .name = "fsl-msi",
 611                 .of_match_table = fsl_of_msi_ids,
 612         },
 613         .probe = fsl_of_msi_probe,
 614         .remove = fsl_of_msi_remove,
 615 };
 616
 617 static __init int fsl_of_msi_init(void)
 618 {
 619         return platform_driver_register(&fsl_of_msi_driver);
 620 }
 621
 622 subsys_initcall(fsl_of_msi_init);