arch/sparc/kernel/pci_fire.c

   1 /* pci_fire.c: Sun4u platform PCI-E controller support.
   2  *
   3  * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
   4  */
   5 #include <linux/kernel.h>
   6 #include <linux/pci.h>
   7 #include <linux/slab.h>
   8 #include <linux/init.h>
   9 #include <linux/msi.h>
  10 #include <linux/irq.h>
  11 #include <linux/of_device.h>
  12
  13 #include <asm/prom.h>
  14 #include <asm/irq.h>
  15 #include <asm/upa.h>
  16
  17 #include "pci_impl.h"
  18
  19 #define DRIVER_NAME     "fire"
  20 #define PFX             DRIVER_NAME ": "
  21
  22 #define FIRE_IOMMU_CONTROL      0x40000UL
  23 #define FIRE_IOMMU_TSBBASE      0x40008UL
  24 #define FIRE_IOMMU_FLUSH        0x40100UL
  25 #define FIRE_IOMMU_FLUSHINV     0x40108UL
  26
  27 static int pci_fire_pbm_iommu_init(struct pci_pbm_info *pbm)
  28 {
  29         struct iommu *iommu = pbm->iommu;
  30         u32 vdma[2], dma_mask;
  31         u64 control;
  32         int tsbsize, err;
  33
  34         /* No virtual-dma property on these guys, use largest size.  */
  35         vdma[0] = 0xc0000000; /* base */
  36         vdma[1] = 0x40000000; /* size */
  37         dma_mask = 0xffffffff;
  38         tsbsize = 128;
  39
  40         /* Register addresses. */
  41         iommu->iommu_control  = pbm->pbm_regs + FIRE_IOMMU_CONTROL;
  42         iommu->iommu_tsbbase  = pbm->pbm_regs + FIRE_IOMMU_TSBBASE;
  43         iommu->iommu_flush    = pbm->pbm_regs + FIRE_IOMMU_FLUSH;
  44         iommu->iommu_flushinv = pbm->pbm_regs + FIRE_IOMMU_FLUSHINV;
  45
  46         /* We use the main control/status register of FIRE as the write
  47          * completion register.
  48          */
  49         iommu->write_complete_reg = pbm->controller_regs + 0x410000UL;
  50
  51         /*
  52          * Invalidate TLB Entries.
  53          */
  54         upa_writeq(~(u64)0, iommu->iommu_flushinv);
  55
  56         err = iommu_table_init(iommu, tsbsize * 8 * 1024, vdma[0], dma_mask,
  57                                pbm->numa_node);
  58         if (err)
  59                 return err;
  60
  61         upa_writeq(__pa(iommu->page_table) | 0x7UL, iommu->iommu_tsbbase);
  62
  63         control = upa_readq(iommu->iommu_control);
  64         control |= (0x00000400 /* TSB cache snoop enable */     |
  65                     0x00000300 /* Cache mode */                 |
  66                     0x00000002 /* Bypass enable */              |
  67                     0x00000001 /* Translation enable */);
  68         upa_writeq(control, iommu->iommu_control);
  69
  70         return 0;
  71 }
  72
  73 #ifdef CONFIG_PCI_MSI
  74 struct pci_msiq_entry {
  75         u64             word0;
  76 #define MSIQ_WORD0_RESV                 0x8000000000000000UL
  77 #define MSIQ_WORD0_FMT_TYPE             0x7f00000000000000UL
  78 #define MSIQ_WORD0_FMT_TYPE_SHIFT       56
  79 #define MSIQ_WORD0_LEN                  0x00ffc00000000000UL
  80 #define MSIQ_WORD0_LEN_SHIFT            46
  81 #define MSIQ_WORD0_ADDR0                0x00003fff00000000UL
  82 #define MSIQ_WORD0_ADDR0_SHIFT          32
  83 #define MSIQ_WORD0_RID                  0x00000000ffff0000UL
  84 #define MSIQ_WORD0_RID_SHIFT            16
  85 #define MSIQ_WORD0_DATA0                0x000000000000ffffUL
  86 #define MSIQ_WORD0_DATA0_SHIFT          0
  87
  88 #define MSIQ_TYPE_MSG                   0x6
  89 #define MSIQ_TYPE_MSI32                 0xb
  90 #define MSIQ_TYPE_MSI64                 0xf
  91
  92         u64             word1;
  93 #define MSIQ_WORD1_ADDR1                0xffffffffffff0000UL
  94 #define MSIQ_WORD1_ADDR1_SHIFT          16
  95 #define MSIQ_WORD1_DATA1                0x000000000000ffffUL
  96 #define MSIQ_WORD1_DATA1_SHIFT          0
  97
  98         u64             resv[6];
  99 };
 100
 101 /* All MSI registers are offset from pbm->pbm_regs */
 102 #define EVENT_QUEUE_BASE_ADDR_REG       0x010000UL
 103 #define  EVENT_QUEUE_BASE_ADDR_ALL_ONES 0xfffc000000000000UL
 104
 105 #define EVENT_QUEUE_CONTROL_SET(EQ)     (0x011000UL + (EQ) * 0x8UL)
 106 #define  EVENT_QUEUE_CONTROL_SET_OFLOW  0x0200000000000000UL
 107 #define  EVENT_QUEUE_CONTROL_SET_EN     0x0000100000000000UL
 108
 109 #define EVENT_QUEUE_CONTROL_CLEAR(EQ)   (0x011200UL + (EQ) * 0x8UL)
 110 #define  EVENT_QUEUE_CONTROL_CLEAR_OF   0x0200000000000000UL
 111 #define  EVENT_QUEUE_CONTROL_CLEAR_E2I  0x0000800000000000UL
 112 #define  EVENT_QUEUE_CONTROL_CLEAR_DIS  0x0000100000000000UL
 113
 114 #define EVENT_QUEUE_STATE(EQ)           (0x011400UL + (EQ) * 0x8UL)
 115 #define  EVENT_QUEUE_STATE_MASK         0x0000000000000007UL
 116 #define  EVENT_QUEUE_STATE_IDLE         0x0000000000000001UL
 117 #define  EVENT_QUEUE_STATE_ACTIVE       0x0000000000000002UL
 118 #define  EVENT_QUEUE_STATE_ERROR        0x0000000000000004UL
 119
 120 #define EVENT_QUEUE_TAIL(EQ)            (0x011600UL + (EQ) * 0x8UL)
 121 #define  EVENT_QUEUE_TAIL_OFLOW         0x0200000000000000UL
 122 #define  EVENT_QUEUE_TAIL_VAL           0x000000000000007fUL
 123
 124 #define EVENT_QUEUE_HEAD(EQ)            (0x011800UL + (EQ) * 0x8UL)
 125 #define  EVENT_QUEUE_HEAD_VAL           0x000000000000007fUL
 126
 127 #define MSI_MAP(MSI)                    (0x020000UL + (MSI) * 0x8UL)
 128 #define  MSI_MAP_VALID                  0x8000000000000000UL
 129 #define  MSI_MAP_EQWR_N                 0x4000000000000000UL
 130 #define  MSI_MAP_EQNUM                  0x000000000000003fUL
 131
 132 #define MSI_CLEAR(MSI)                  (0x028000UL + (MSI) * 0x8UL)
 133 #define  MSI_CLEAR_EQWR_N               0x4000000000000000UL
 134
 135 #define IMONDO_DATA0                    0x02C000UL
 136 #define  IMONDO_DATA0_DATA              0xffffffffffffffc0UL
 137
 138 #define IMONDO_DATA1                    0x02C008UL
 139 #define  IMONDO_DATA1_DATA              0xffffffffffffffffUL
 140
 141 #define MSI_32BIT_ADDR                  0x034000UL
 142 #define  MSI_32BIT_ADDR_VAL             0x00000000ffff0000UL
 143
 144 #define MSI_64BIT_ADDR                  0x034008UL
 145 #define  MSI_64BIT_ADDR_VAL             0xffffffffffff0000UL
 146
 147 static int pci_fire_get_head(struct pci_pbm_info *pbm, unsigned long msiqid,
 148                              unsigned long *head)
 149 {
 150         *head = upa_readq(pbm->pbm_regs + EVENT_QUEUE_HEAD(msiqid));
 151         return 0;
 152 }
 153
 154 static int pci_fire_dequeue_msi(struct pci_pbm_info *pbm, unsigned long msiqid,
 155                                 unsigned long *head, unsigned long *msi)
 156 {
 157         unsigned long type_fmt, type, msi_num;
 158         struct pci_msiq_entry *base, *ep;
 159
 160         base = (pbm->msi_queues + ((msiqid - pbm->msiq_first) * 8192));
 161         ep = &base[*head];
 162
 163         if ((ep->word0 & MSIQ_WORD0_FMT_TYPE) == 0)
 164                 return 0;
 165
 166         type_fmt = ((ep->word0 & MSIQ_WORD0_FMT_TYPE) >>
 167                     MSIQ_WORD0_FMT_TYPE_SHIFT);
 168         type = (type_fmt >> 3);
 169         if (unlikely(type != MSIQ_TYPE_MSI32 &&
 170                      type != MSIQ_TYPE_MSI64))
 171                 return -EINVAL;
 172
 173         *msi = msi_num = ((ep->word0 & MSIQ_WORD0_DATA0) >>
 174                           MSIQ_WORD0_DATA0_SHIFT);
 175
 176         upa_writeq(MSI_CLEAR_EQWR_N, pbm->pbm_regs + MSI_CLEAR(msi_num));
 177
 178         /* Clear the entry.  */
 179         ep->word0 &= ~MSIQ_WORD0_FMT_TYPE;
 180
 181         /* Go to next entry in ring.  */
 182         (*head)++;
 183         if (*head >= pbm->msiq_ent_count)
 184                 *head = 0;
 185
 186         return 1;
 187 }
 188
 189 static int pci_fire_set_head(struct pci_pbm_info *pbm, unsigned long msiqid,
 190                              unsigned long head)
 191 {
 192         upa_writeq(head, pbm->pbm_regs + EVENT_QUEUE_HEAD(msiqid));
 193         return 0;
 194 }
 195
 196 static int pci_fire_msi_setup(struct pci_pbm_info *pbm, unsigned long msiqid,
 197                               unsigned long msi, int is_msi64)
 198 {
 199         u64 val;
 200
 201         val = upa_readq(pbm->pbm_regs + MSI_MAP(msi));
 202         val &= ~(MSI_MAP_EQNUM);
 203         val |= msiqid;
 204         upa_writeq(val, pbm->pbm_regs + MSI_MAP(msi));
 205
 206         upa_writeq(MSI_CLEAR_EQWR_N, pbm->pbm_regs + MSI_CLEAR(msi));
 207
 208         val = upa_readq(pbm->pbm_regs + MSI_MAP(msi));
 209         val |= MSI_MAP_VALID;
 210         upa_writeq(val, pbm->pbm_regs + MSI_MAP(msi));
 211
 212         return 0;
 213 }
 214
 215 static int pci_fire_msi_teardown(struct pci_pbm_info *pbm, unsigned long msi)
 216 {
 217         unsigned long msiqid;
 218         u64 val;
 219
 220         val = upa_readq(pbm->pbm_regs + MSI_MAP(msi));
 221         msiqid = (val & MSI_MAP_EQNUM);
 222
 223         val &= ~MSI_MAP_VALID;
 224
 225         upa_writeq(val, pbm->pbm_regs + MSI_MAP(msi));
 226
 227         return 0;
 228 }
 229
 230 static int pci_fire_msiq_alloc(struct pci_pbm_info *pbm)
 231 {
 232         unsigned long pages, order, i;
 233
 234         order = get_order(512 * 1024);
 235         pages = __get_free_pages(GFP_KERNEL | __GFP_COMP, order);
 236         if (pages == 0UL) {
 237                 printk(KERN_ERR "MSI: Cannot allocate MSI queues (o=%lu).\n",
 238                        order);
 239                 return -ENOMEM;
 240         }
 241         memset((char *)pages, 0, PAGE_SIZE << order);
 242         pbm->msi_queues = (void *) pages;
 243
 244         upa_writeq((EVENT_QUEUE_BASE_ADDR_ALL_ONES |
 245                     __pa(pbm->msi_queues)),
 246                    pbm->pbm_regs + EVENT_QUEUE_BASE_ADDR_REG);
 247
 248         upa_writeq(pbm->portid << 6, pbm->pbm_regs + IMONDO_DATA0);
 249         upa_writeq(0, pbm->pbm_regs + IMONDO_DATA1);
 250
 251         upa_writeq(pbm->msi32_start, pbm->pbm_regs + MSI_32BIT_ADDR);
 252         upa_writeq(pbm->msi64_start, pbm->pbm_regs + MSI_64BIT_ADDR);
 253
 254         for (i = 0; i < pbm->msiq_num; i++) {
 255                 upa_writeq(0, pbm->pbm_regs + EVENT_QUEUE_HEAD(i));
 256                 upa_writeq(0, pbm->pbm_regs + EVENT_QUEUE_TAIL(i));
 257         }
 258
 259         return 0;
 260 }
 261
 262 static void pci_fire_msiq_free(struct pci_pbm_info *pbm)
 263 {
 264         unsigned long pages, order;
 265
 266         order = get_order(512 * 1024);
 267         pages = (unsigned long) pbm->msi_queues;
 268
 269         free_pages(pages, order);
 270
 271         pbm->msi_queues = NULL;
 272 }
 273
 274 static int pci_fire_msiq_build_irq(struct pci_pbm_info *pbm,
 275                                    unsigned long msiqid,
 276                                    unsigned long devino)
 277 {
 278         unsigned long cregs = (unsigned long) pbm->pbm_regs;
 279         unsigned long imap_reg, iclr_reg, int_ctrlr;
 280         unsigned int virt_irq;
 281         int fixup;
 282         u64 val;
 283
 284         imap_reg = cregs + (0x001000UL + (devino * 0x08UL));
 285         iclr_reg = cregs + (0x001400UL + (devino * 0x08UL));
 286
 287         /* XXX iterate amongst the 4 IRQ controllers XXX */
 288         int_ctrlr = (1UL << 6);
 289
 290         val = upa_readq(imap_reg);
 291         val |= (1UL << 63) | int_ctrlr;
 292         upa_writeq(val, imap_reg);
 293
 294         fixup = ((pbm->portid << 6) | devino) - int_ctrlr;
 295
 296         virt_irq = build_irq(fixup, iclr_reg, imap_reg);
 297         if (!virt_irq)
 298                 return -ENOMEM;
 299
 300         upa_writeq(EVENT_QUEUE_CONTROL_SET_EN,
 301                    pbm->pbm_regs + EVENT_QUEUE_CONTROL_SET(msiqid));
 302
 303         return virt_irq;
 304 }
 305
 306 static const struct sparc64_msiq_ops pci_fire_msiq_ops = {
 307         .get_head       =       pci_fire_get_head,
 308         .dequeue_msi    =       pci_fire_dequeue_msi,
 309         .set_head       =       pci_fire_set_head,
 310         .msi_setup      =       pci_fire_msi_setup,
 311         .msi_teardown   =       pci_fire_msi_teardown,
 312         .msiq_alloc     =       pci_fire_msiq_alloc,
 313         .msiq_free      =       pci_fire_msiq_free,
 314         .msiq_build_irq =       pci_fire_msiq_build_irq,
 315 };
 316
 317 static void pci_fire_msi_init(struct pci_pbm_info *pbm)
 318 {
 319         sparc64_pbm_msi_init(pbm, &pci_fire_msiq_ops);
 320 }
 321 #else /* CONFIG_PCI_MSI */
 322 static void pci_fire_msi_init(struct pci_pbm_info *pbm)
 323 {
 324 }
 325 #endif /* !(CONFIG_PCI_MSI) */
 326
 327 /* Based at pbm->controller_regs */
 328 #define FIRE_PARITY_CONTROL     0x470010UL
 329 #define  FIRE_PARITY_ENAB       0x8000000000000000UL
 330 #define FIRE_FATAL_RESET_CTL    0x471028UL
 331 #define  FIRE_FATAL_RESET_SPARE 0x0000000004000000UL
 332 #define  FIRE_FATAL_RESET_MB    0x0000000002000000UL
 333 #define  FIRE_FATAL_RESET_CPE   0x0000000000008000UL
 334 #define  FIRE_FATAL_RESET_APE   0x0000000000004000UL
 335 #define  FIRE_FATAL_RESET_PIO   0x0000000000000040UL
 336 #define  FIRE_FATAL_RESET_JW    0x0000000000000004UL
 337 #define  FIRE_FATAL_RESET_JI    0x0000000000000002UL
 338 #define  FIRE_FATAL_RESET_JR    0x0000000000000001UL
 339 #define FIRE_CORE_INTR_ENABLE   0x471800UL
 340
 341 /* Based at pbm->pbm_regs */
 342 #define FIRE_TLU_CTRL           0x80000UL
 343 #define  FIRE_TLU_CTRL_TIM      0x00000000da000000UL
 344 #define  FIRE_TLU_CTRL_QDET     0x0000000000000100UL
 345 #define  FIRE_TLU_CTRL_CFG      0x0000000000000001UL
 346 #define FIRE_TLU_DEV_CTRL       0x90008UL
 347 #define FIRE_TLU_LINK_CTRL      0x90020UL
 348 #define FIRE_TLU_LINK_CTRL_CLK  0x0000000000000040UL
 349 #define FIRE_LPU_RESET          0xe2008UL
 350 #define FIRE_LPU_LLCFG          0xe2200UL
 351 #define  FIRE_LPU_LLCFG_VC0     0x0000000000000100UL
 352 #define FIRE_LPU_FCTRL_UCTRL    0xe2240UL
 353 #define  FIRE_LPU_FCTRL_UCTRL_N 0x0000000000000002UL
 354 #define  FIRE_LPU_FCTRL_UCTRL_P 0x0000000000000001UL
 355 #define FIRE_LPU_TXL_FIFOP      0xe2430UL
 356 #define FIRE_LPU_LTSSM_CFG2     0xe2788UL
 357 #define FIRE_LPU_LTSSM_CFG3     0xe2790UL
 358 #define FIRE_LPU_LTSSM_CFG4     0xe2798UL
 359 #define FIRE_LPU_LTSSM_CFG5     0xe27a0UL
 360 #define FIRE_DMC_IENAB          0x31800UL
 361 #define FIRE_DMC_DBG_SEL_A      0x53000UL
 362 #define FIRE_DMC_DBG_SEL_B      0x53008UL
 363 #define FIRE_PEC_IENAB          0x51800UL
 364
 365 static void pci_fire_hw_init(struct pci_pbm_info *pbm)
 366 {
 367         u64 val;
 368
 369         upa_writeq(FIRE_PARITY_ENAB,
 370                    pbm->controller_regs + FIRE_PARITY_CONTROL);
 371
 372         upa_writeq((FIRE_FATAL_RESET_SPARE |
 373                     FIRE_FATAL_RESET_MB |
 374                     FIRE_FATAL_RESET_CPE |
 375                     FIRE_FATAL_RESET_APE |
 376                     FIRE_FATAL_RESET_PIO |
 377                     FIRE_FATAL_RESET_JW |
 378                     FIRE_FATAL_RESET_JI |
 379                     FIRE_FATAL_RESET_JR),
 380                    pbm->controller_regs + FIRE_FATAL_RESET_CTL);
 381
 382         upa_writeq(~(u64)0, pbm->controller_regs + FIRE_CORE_INTR_ENABLE);
 383
 384         val = upa_readq(pbm->pbm_regs + FIRE_TLU_CTRL);
 385         val |= (FIRE_TLU_CTRL_TIM |
 386                 FIRE_TLU_CTRL_QDET |
 387                 FIRE_TLU_CTRL_CFG);
 388         upa_writeq(val, pbm->pbm_regs + FIRE_TLU_CTRL);
 389         upa_writeq(0, pbm->pbm_regs + FIRE_TLU_DEV_CTRL);
 390         upa_writeq(FIRE_TLU_LINK_CTRL_CLK,
 391                    pbm->pbm_regs + FIRE_TLU_LINK_CTRL);
 392
 393         upa_writeq(0, pbm->pbm_regs + FIRE_LPU_RESET);
 394         upa_writeq(FIRE_LPU_LLCFG_VC0, pbm->pbm_regs + FIRE_LPU_LLCFG);
 395         upa_writeq((FIRE_LPU_FCTRL_UCTRL_N | FIRE_LPU_FCTRL_UCTRL_P),
 396                    pbm->pbm_regs + FIRE_LPU_FCTRL_UCTRL);
 397         upa_writeq(((0xffff << 16) | (0x0000 << 0)),
 398                    pbm->pbm_regs + FIRE_LPU_TXL_FIFOP);
 399         upa_writeq(3000000, pbm->pbm_regs + FIRE_LPU_LTSSM_CFG2);
 400         upa_writeq(500000, pbm->pbm_regs + FIRE_LPU_LTSSM_CFG3);
 401         upa_writeq((2 << 16) | (140 << 8),
 402                    pbm->pbm_regs + FIRE_LPU_LTSSM_CFG4);
 403         upa_writeq(0, pbm->pbm_regs + FIRE_LPU_LTSSM_CFG5);
 404
 405         upa_writeq(~(u64)0, pbm->pbm_regs + FIRE_DMC_IENAB);
 406         upa_writeq(0, pbm->pbm_regs + FIRE_DMC_DBG_SEL_A);
 407         upa_writeq(0, pbm->pbm_regs + FIRE_DMC_DBG_SEL_B);
 408
 409         upa_writeq(~(u64)0, pbm->pbm_regs + FIRE_PEC_IENAB);
 410 }
 411
 412 static int __devinit pci_fire_pbm_init(struct pci_pbm_info *pbm,
 413                                        struct of_device *op, u32 portid)
 414 {
 415         const struct linux_prom64_registers *regs;
 416         struct device_node *dp = op->node;
 417         int err;
 418
 419         pbm->numa_node = -1;
 420
 421         pbm->pci_ops = &sun4u_pci_ops;
 422         pbm->config_space_reg_bits = 12;
 423
 424         pbm->index = pci_num_pbms++;
 425
 426         pbm->portid = portid;
 427         pbm->op = op;
 428         pbm->name = dp->full_name;
 429
 430         regs = of_get_property(dp, "reg", NULL);
 431         pbm->pbm_regs = regs[0].phys_addr;
 432         pbm->controller_regs = regs[1].phys_addr - 0x410000UL;
 433
 434         printk("%s: SUN4U PCIE Bus Module\n", pbm->name);
 435
 436         pci_determine_mem_io_space(pbm);
 437
 438         pci_get_pbm_props(pbm);
 439
 440         pci_fire_hw_init(pbm);
 441
 442         err = pci_fire_pbm_iommu_init(pbm);
 443         if (err)
 444                 return err;
 445
 446         pci_fire_msi_init(pbm);
 447
 448         pbm->pci_bus = pci_scan_one_pbm(pbm, &op->dev);
 449
 450         /* XXX register error interrupt handlers XXX */
 451
 452         pbm->next = pci_pbm_root;
 453         pci_pbm_root = pbm;
 454
 455         return 0;
 456 }
 457
 458 static int __devinit fire_probe(struct of_device *op,
 459                                 const struct of_device_id *match)
 460 {
 461         struct device_node *dp = op->node;
 462         struct pci_pbm_info *pbm;
 463         struct iommu *iommu;
 464         u32 portid;
 465         int err;
 466
 467         portid = of_getintprop_default(dp, "portid", 0xff);
 468
 469         err = -ENOMEM;
 470         pbm = kzalloc(sizeof(*pbm), GFP_KERNEL);
 471         if (!pbm) {
 472                 printk(KERN_ERR PFX "Cannot allocate pci_pbminfo.\n");
 473                 goto out_err;
 474         }
 475
 476         iommu = kzalloc(sizeof(struct iommu), GFP_KERNEL);
 477         if (!iommu) {
 478                 printk(KERN_ERR PFX "Cannot allocate PBM iommu.\n");
 479                 goto out_free_controller;
 480         }
 481
 482         pbm->iommu = iommu;
 483
 484         err = pci_fire_pbm_init(pbm, op, portid);
 485         if (err)
 486                 goto out_free_iommu;
 487
 488         dev_set_drvdata(&op->dev, pbm);
 489
 490         return 0;
 491
 492 out_free_iommu:
 493         kfree(pbm->iommu);
 494
 495 out_free_controller:
 496         kfree(pbm);
 497
 498 out_err:
 499         return err;
 500 }
 501
 502 static struct of_device_id __initdata fire_match[] = {
 503         {
 504                 .name = "pci",
 505                 .compatible = "pciex108e,80f0",
 506         },
 507         {},
 508 };
 509
 510 static struct of_platform_driver fire_driver = {
 511         .name           = DRIVER_NAME,
 512         .match_table    = fire_match,
 513         .probe          = fire_probe,
 514 };
 515
 516 static int __init fire_init(void)
 517 {
 518         return of_register_driver(&fire_driver, &of_bus_type);
 519 }
 520
 521 subsys_initcall(fire_init);