arch/sparc/kernel/leon_pci_grpci2.c

   1 /*
   2  * leon_pci_grpci2.c: GRPCI2 Host PCI driver
   3  *
   4  * Copyright (C) 2011 Aeroflex Gaisler AB, Daniel Hellstrom
   5  *
   6  */
   7
   8 #include <linux/of_device.h>
   9 #include <linux/kernel.h>
  10 #include <linux/pci.h>
  11 #include <linux/slab.h>
  12 #include <linux/delay.h>
  13 #include <linux/export.h>
  14 #include <asm/io.h>
  15 #include <asm/leon.h>
  16 #include <asm/vaddrs.h>
  17 #include <asm/sections.h>
  18 #include <asm/leon_pci.h>
  19
  20 #include "irq.h"
  21
  22 struct grpci2_barcfg {
  23         unsigned long pciadr;   /* PCI Space Address */
  24         unsigned long ahbadr;   /* PCI Base address mapped to this AHB addr */
  25 };
  26
  27 /* Device Node Configuration options:
  28  *  - barcfgs    : Custom Configuration of Host's 6 target BARs
  29  *  - irq_mask   : Limit which PCI interrupts are enabled
  30  *  - do_reset   : Force PCI Reset on startup
  31  *
  32  * barcfgs
  33  * =======
  34  *
  35  * Optional custom Target BAR configuration (see struct grpci2_barcfg). All
  36  * addresses are physical. Array always contains 6 elements (len=2*4*6 bytes)
  37  *
  38  * -1 means not configured (let host driver do default setup).
  39  *
  40  * [i*2+0] = PCI Address of BAR[i] on target interface
  41  * [i*2+1] = Accessing PCI address of BAR[i] result in this AMBA address
  42  *
  43  *
  44  * irq_mask
  45  * ========
  46  *
  47  * Limit which PCI interrupts are enabled. 0=Disable, 1=Enable. By default
  48  * all are enabled. Use this when PCI interrupt pins are floating on PCB.
  49  * int, len=4.
  50  *  bit0 = PCI INTA#
  51  *  bit1 = PCI INTB#
  52  *  bit2 = PCI INTC#
  53  *  bit3 = PCI INTD#
  54  *
  55  *
  56  * reset
  57  * =====
  58  *
  59  * Force PCI reset on startup. int, len=4
  60  */
  61
  62 /* Enable Debugging Configuration Space Access */
  63 #undef GRPCI2_DEBUG_CFGACCESS
  64
  65 /*
  66  * GRPCI2 APB Register MAP
  67  */
  68 struct grpci2_regs {
  69         unsigned int ctrl;              /* 0x00 Control */
  70         unsigned int sts_cap;           /* 0x04 Status / Capabilities */
  71         int res1;                       /* 0x08 */
  72         unsigned int io_map;            /* 0x0C I/O Map address */
  73         unsigned int dma_ctrl;          /* 0x10 DMA */
  74         unsigned int dma_bdbase;        /* 0x14 DMA */
  75         int res2[2];                    /* 0x18 */
  76         unsigned int bars[6];           /* 0x20 read-only PCI BARs */
  77         int res3[2];                    /* 0x38 */
  78         unsigned int ahbmst_map[16];    /* 0x40 AHB->PCI Map per AHB Master */
  79
  80         /* PCI Trace Buffer Registers (OPTIONAL) */
  81         unsigned int t_ctrl;            /* 0x80 */
  82         unsigned int t_cnt;             /* 0x84 */
  83         unsigned int t_adpat;           /* 0x88 */
  84         unsigned int t_admask;          /* 0x8C */
  85         unsigned int t_sigpat;          /* 0x90 */
  86         unsigned int t_sigmask;         /* 0x94 */
  87         unsigned int t_adstate;         /* 0x98 */
  88         unsigned int t_sigstate;        /* 0x9C */
  89 };
  90
  91 #define REGLOAD(a)      (be32_to_cpu(__raw_readl(&(a))))
  92 #define REGSTORE(a, v)  (__raw_writel(cpu_to_be32(v), &(a)))
  93
  94 #define CTRL_BUS_BIT 16
  95
  96 #define CTRL_RESET (1<<31)
  97 #define CTRL_SI (1<<27)
  98 #define CTRL_PE (1<<26)
  99 #define CTRL_EI (1<<25)
 100 #define CTRL_ER (1<<24)
 101 #define CTRL_BUS (0xff<<CTRL_BUS_BIT)
 102 #define CTRL_HOSTINT 0xf
 103
 104 #define STS_HOST_BIT    31
 105 #define STS_MST_BIT     30
 106 #define STS_TAR_BIT     29
 107 #define STS_DMA_BIT     28
 108 #define STS_DI_BIT      27
 109 #define STS_HI_BIT      26
 110 #define STS_IRQMODE_BIT 24
 111 #define STS_TRACE_BIT   23
 112 #define STS_CFGERRVALID_BIT 20
 113 #define STS_CFGERR_BIT  19
 114 #define STS_INTTYPE_BIT 12
 115 #define STS_INTSTS_BIT  8
 116 #define STS_FDEPTH_BIT  2
 117 #define STS_FNUM_BIT    0
 118
 119 #define STS_HOST        (1<<STS_HOST_BIT)
 120 #define STS_MST         (1<<STS_MST_BIT)
 121 #define STS_TAR         (1<<STS_TAR_BIT)
 122 #define STS_DMA         (1<<STS_DMA_BIT)
 123 #define STS_DI          (1<<STS_DI_BIT)
 124 #define STS_HI          (1<<STS_HI_BIT)
 125 #define STS_IRQMODE     (0x3<<STS_IRQMODE_BIT)
 126 #define STS_TRACE       (1<<STS_TRACE_BIT)
 127 #define STS_CFGERRVALID (1<<STS_CFGERRVALID_BIT)
 128 #define STS_CFGERR      (1<<STS_CFGERR_BIT)
 129 #define STS_INTTYPE     (0x3f<<STS_INTTYPE_BIT)
 130 #define STS_INTSTS      (0xf<<STS_INTSTS_BIT)
 131 #define STS_FDEPTH      (0x7<<STS_FDEPTH_BIT)
 132 #define STS_FNUM        (0x3<<STS_FNUM_BIT)
 133
 134 #define STS_ISYSERR     (1<<17)
 135 #define STS_IDMA        (1<<16)
 136 #define STS_IDMAERR     (1<<15)
 137 #define STS_IMSTABRT    (1<<14)
 138 #define STS_ITGTABRT    (1<<13)
 139 #define STS_IPARERR     (1<<12)
 140
 141 #define STS_ERR_IRQ (STS_ISYSERR | STS_IMSTABRT | STS_ITGTABRT | STS_IPARERR)
 142
 143 struct grpci2_bd_chan {
 144         unsigned int ctrl;      /* 0x00 DMA Control */
 145         unsigned int nchan;     /* 0x04 Next DMA Channel Address */
 146         unsigned int nbd;       /* 0x08 Next Data Descriptor in chan */
 147         unsigned int res;       /* 0x0C Reserved */
 148 };
 149
 150 #define BD_CHAN_EN              0x80000000
 151 #define BD_CHAN_TYPE            0x00300000
 152 #define BD_CHAN_BDCNT           0x0000ffff
 153 #define BD_CHAN_EN_BIT          31
 154 #define BD_CHAN_TYPE_BIT        20
 155 #define BD_CHAN_BDCNT_BIT       0
 156
 157 struct grpci2_bd_data {
 158         unsigned int ctrl;      /* 0x00 DMA Data Control */
 159         unsigned int pci_adr;   /* 0x04 PCI Start Address */
 160         unsigned int ahb_adr;   /* 0x08 AHB Start address */
 161         unsigned int next;      /* 0x0C Next Data Descriptor in chan */
 162 };
 163
 164 #define BD_DATA_EN              0x80000000
 165 #define BD_DATA_IE              0x40000000
 166 #define BD_DATA_DR              0x20000000
 167 #define BD_DATA_TYPE            0x00300000
 168 #define BD_DATA_ER              0x00080000
 169 #define BD_DATA_LEN             0x0000ffff
 170 #define BD_DATA_EN_BIT          31
 171 #define BD_DATA_IE_BIT          30
 172 #define BD_DATA_DR_BIT          29
 173 #define BD_DATA_TYPE_BIT        20
 174 #define BD_DATA_ER_BIT          19
 175 #define BD_DATA_LEN_BIT         0
 176
 177 /* GRPCI2 Capability */
 178 struct grpci2_cap_first {
 179         unsigned int ctrl;
 180         unsigned int pci2ahb_map[6];
 181         unsigned int ext2ahb_map;
 182         unsigned int io_map;
 183         unsigned int pcibar_size[6];
 184 };
 185 #define CAP9_CTRL_OFS 0
 186 #define CAP9_BAR_OFS 0x4
 187 #define CAP9_IOMAP_OFS 0x20
 188 #define CAP9_BARSIZE_OFS 0x24
 189
 190 #define TGT 256
 191
 192 struct grpci2_priv {
 193         struct leon_pci_info    info; /* must be on top of this structure */
 194         struct grpci2_regs __iomem *regs;
 195         char                    irq;
 196         char                    irq_mode; /* IRQ Mode from CAPSTS REG */
 197         char                    bt_enabled;
 198         char                    do_reset;
 199         char                    irq_mask;
 200         u32                     pciid; /* PCI ID of Host */
 201         unsigned char           irq_map[4];
 202
 203         /* Virtual IRQ numbers */
 204         unsigned int            virq_err;
 205         unsigned int            virq_dma;
 206
 207         /* AHB PCI Windows */
 208         unsigned long           pci_area;       /* MEMORY */
 209         unsigned long           pci_area_end;
 210         unsigned long           pci_io;         /* I/O */
 211         unsigned long           pci_conf;       /* CONFIGURATION */
 212         unsigned long           pci_conf_end;
 213         unsigned long           pci_io_va;
 214
 215         struct grpci2_barcfg    tgtbars[6];
 216 };
 217
 218 static DEFINE_SPINLOCK(grpci2_dev_lock);
 219 static struct grpci2_priv *grpci2priv;
 220
 221 static int grpci2_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 222 {
 223         struct grpci2_priv *priv = dev->bus->sysdata;
 224         int irq_group;
 225
 226         /* Use default IRQ decoding on PCI BUS0 according slot numbering */
 227         irq_group = slot & 0x3;
 228         pin = ((pin - 1) + irq_group) & 0x3;
 229
 230         return priv->irq_map[pin];
 231 }
 232
 233 static int grpci2_cfg_r32(struct grpci2_priv *priv, unsigned int bus,
 234                                 unsigned int devfn, int where, u32 *val)
 235 {
 236         unsigned int *pci_conf;
 237         unsigned long flags;
 238         u32 tmp;
 239
 240         if (where & 0x3)
 241                 return -EINVAL;
 242
 243         if (bus == 0) {
 244                 devfn += (0x8 * 6); /* start at AD16=Device0 */
 245         } else if (bus == TGT) {
 246                 bus = 0;
 247                 devfn = 0; /* special case: bridge controller itself */
 248         }
 249
 250         /* Select bus */
 251         spin_lock_irqsave(&grpci2_dev_lock, flags);
 252         REGSTORE(priv->regs->ctrl, (REGLOAD(priv->regs->ctrl) & ~(0xff << 16)) |
 253                                    (bus << 16));
 254         spin_unlock_irqrestore(&grpci2_dev_lock, flags);
 255
 256         /* clear old status */
 257         REGSTORE(priv->regs->sts_cap, (STS_CFGERR | STS_CFGERRVALID));
 258
 259         pci_conf = (unsigned int *) (priv->pci_conf |
 260                                                 (devfn << 8) | (where & 0xfc));
 261         tmp = LEON3_BYPASS_LOAD_PA(pci_conf);
 262
 263         /* Wait until GRPCI2 signals that CFG access is done, it should be
 264          * done instantaneously unless a DMA operation is ongoing...
 265          */
 266         while ((REGLOAD(priv->regs->sts_cap) & STS_CFGERRVALID) == 0)
 267                 ;
 268
 269         if (REGLOAD(priv->regs->sts_cap) & STS_CFGERR) {
 270                 *val = 0xffffffff;
 271         } else {
 272                 /* Bus always little endian (unaffected by byte-swapping) */
 273                 *val = swab32(tmp);
 274         }
 275
 276         return 0;
 277 }
 278
 279 static int grpci2_cfg_r16(struct grpci2_priv *priv, unsigned int bus,
 280                                 unsigned int devfn, int where, u32 *val)
 281 {
 282         u32 v;
 283         int ret;
 284
 285         if (where & 0x1)
 286                 return -EINVAL;
 287         ret = grpci2_cfg_r32(priv, bus, devfn, where & ~0x3, &v);
 288         *val = 0xffff & (v >> (8 * (where & 0x3)));
 289         return ret;
 290 }
 291
 292 static int grpci2_cfg_r8(struct grpci2_priv *priv, unsigned int bus,
 293                                 unsigned int devfn, int where, u32 *val)
 294 {
 295         u32 v;
 296         int ret;
 297
 298         ret = grpci2_cfg_r32(priv, bus, devfn, where & ~0x3, &v);
 299         *val = 0xff & (v >> (8 * (where & 3)));
 300
 301         return ret;
 302 }
 303
 304 static int grpci2_cfg_w32(struct grpci2_priv *priv, unsigned int bus,
 305                                 unsigned int devfn, int where, u32 val)
 306 {
 307         unsigned int *pci_conf;
 308         unsigned long flags;
 309
 310         if (where & 0x3)
 311                 return -EINVAL;
 312
 313         if (bus == 0) {
 314                 devfn += (0x8 * 6); /* start at AD16=Device0 */
 315         } else if (bus == TGT) {
 316                 bus = 0;
 317                 devfn = 0; /* special case: bridge controller itself */
 318         }
 319
 320         /* Select bus */
 321         spin_lock_irqsave(&grpci2_dev_lock, flags);
 322         REGSTORE(priv->regs->ctrl, (REGLOAD(priv->regs->ctrl) & ~(0xff << 16)) |
 323                                    (bus << 16));
 324         spin_unlock_irqrestore(&grpci2_dev_lock, flags);
 325
 326         /* clear old status */
 327         REGSTORE(priv->regs->sts_cap, (STS_CFGERR | STS_CFGERRVALID));
 328
 329         pci_conf = (unsigned int *) (priv->pci_conf |
 330                                                 (devfn << 8) | (where & 0xfc));
 331         LEON3_BYPASS_STORE_PA(pci_conf, swab32(val));
 332
 333         /* Wait until GRPCI2 signals that CFG access is done, it should be
 334          * done instantaneously unless a DMA operation is ongoing...
 335          */
 336         while ((REGLOAD(priv->regs->sts_cap) & STS_CFGERRVALID) == 0)
 337                 ;
 338
 339         return 0;
 340 }
 341
 342 static int grpci2_cfg_w16(struct grpci2_priv *priv, unsigned int bus,
 343                                 unsigned int devfn, int where, u32 val)
 344 {
 345         int ret;
 346         u32 v;
 347
 348         if (where & 0x1)
 349                 return -EINVAL;
 350         ret = grpci2_cfg_r32(priv, bus, devfn, where&~3, &v);
 351         if (ret)
 352                 return ret;
 353         v = (v & ~(0xffff << (8 * (where & 0x3)))) |
 354             ((0xffff & val) << (8 * (where & 0x3)));
 355         return grpci2_cfg_w32(priv, bus, devfn, where & ~0x3, v);
 356 }
 357
 358 static int grpci2_cfg_w8(struct grpci2_priv *priv, unsigned int bus,
 359                                 unsigned int devfn, int where, u32 val)
 360 {
 361         int ret;
 362         u32 v;
 363
 364         ret = grpci2_cfg_r32(priv, bus, devfn, where & ~0x3, &v);
 365         if (ret != 0)
 366                 return ret;
 367         v = (v & ~(0xff << (8 * (where & 0x3)))) |
 368             ((0xff & val) << (8 * (where & 0x3)));
 369         return grpci2_cfg_w32(priv, bus, devfn, where & ~0x3, v);
 370 }
 371
 372 /* Read from Configuration Space. When entering here the PCI layer has taken
 373  * the pci_lock spinlock and IRQ is off.
 374  */
 375 static int grpci2_read_config(struct pci_bus *bus, unsigned int devfn,
 376                               int where, int size, u32 *val)
 377 {
 378         struct grpci2_priv *priv = grpci2priv;
 379         unsigned int busno = bus->number;
 380         int ret;
 381
 382         if (PCI_SLOT(devfn) > 15 || busno > 255) {
 383                 *val = ~0;
 384                 return 0;
 385         }
 386
 387         switch (size) {
 388         case 1:
 389                 ret = grpci2_cfg_r8(priv, busno, devfn, where, val);
 390                 break;
 391         case 2:
 392                 ret = grpci2_cfg_r16(priv, busno, devfn, where, val);
 393                 break;
 394         case 4:
 395                 ret = grpci2_cfg_r32(priv, busno, devfn, where, val);
 396                 break;
 397         default:
 398                 ret = -EINVAL;
 399                 break;
 400         }
 401
 402 #ifdef GRPCI2_DEBUG_CFGACCESS
 403         printk(KERN_INFO "grpci2_read_config: [%02x:%02x:%x] ofs=%d val=%x "
 404                 "size=%d\n", busno, PCI_SLOT(devfn), PCI_FUNC(devfn), where,
 405                 *val, size);
 406 #endif
 407
 408         return ret;
 409 }
 410
 411 /* Write to Configuration Space. When entering here the PCI layer has taken
 412  * the pci_lock spinlock and IRQ is off.
 413  */
 414 static int grpci2_write_config(struct pci_bus *bus, unsigned int devfn,
 415                                int where, int size, u32 val)
 416 {
 417         struct grpci2_priv *priv = grpci2priv;
 418         unsigned int busno = bus->number;
 419
 420         if (PCI_SLOT(devfn) > 15 || busno > 255)
 421                 return 0;
 422
 423 #ifdef GRPCI2_DEBUG_CFGACCESS
 424         printk(KERN_INFO "grpci2_write_config: [%02x:%02x:%x] ofs=%d size=%d "
 425                 "val=%x\n", busno, PCI_SLOT(devfn), PCI_FUNC(devfn),
 426                 where, size, val);
 427 #endif
 428
 429         switch (size) {
 430         default:
 431                 return -EINVAL;
 432         case 1:
 433                 return grpci2_cfg_w8(priv, busno, devfn, where, val);
 434         case 2:
 435                 return grpci2_cfg_w16(priv, busno, devfn, where, val);
 436         case 4:
 437                 return grpci2_cfg_w32(priv, busno, devfn, where, val);
 438         }
 439 }
 440
 441 static struct pci_ops grpci2_ops = {
 442         .read =         grpci2_read_config,
 443         .write =        grpci2_write_config,
 444 };
 445
 446 /* GENIRQ IRQ chip implementation for GRPCI2 irqmode=0..2. In configuration
 447  * 3 where all PCI Interrupts has a separate IRQ on the system IRQ controller
 448  * this is not needed and the standard IRQ controller can be used.
 449  */
 450
 451 static void grpci2_mask_irq(struct irq_data *data)
 452 {
 453         unsigned long flags;
 454         unsigned int irqidx;
 455         struct grpci2_priv *priv = grpci2priv;
 456
 457         irqidx = (unsigned int)data->chip_data - 1;
 458         if (irqidx > 3) /* only mask PCI interrupts here */
 459                 return;
 460
 461         spin_lock_irqsave(&grpci2_dev_lock, flags);
 462         REGSTORE(priv->regs->ctrl, REGLOAD(priv->regs->ctrl) & ~(1 << irqidx));
 463         spin_unlock_irqrestore(&grpci2_dev_lock, flags);
 464 }
 465
 466 static void grpci2_unmask_irq(struct irq_data *data)
 467 {
 468         unsigned long flags;
 469         unsigned int irqidx;
 470         struct grpci2_priv *priv = grpci2priv;
 471
 472         irqidx = (unsigned int)data->chip_data - 1;
 473         if (irqidx > 3) /* only unmask PCI interrupts here */
 474                 return;
 475
 476         spin_lock_irqsave(&grpci2_dev_lock, flags);
 477         REGSTORE(priv->regs->ctrl, REGLOAD(priv->regs->ctrl) | (1 << irqidx));
 478         spin_unlock_irqrestore(&grpci2_dev_lock, flags);
 479 }
 480
 481 static unsigned int grpci2_startup_irq(struct irq_data *data)
 482 {
 483         grpci2_unmask_irq(data);
 484         return 0;
 485 }
 486
 487 static void grpci2_shutdown_irq(struct irq_data *data)
 488 {
 489         grpci2_mask_irq(data);
 490 }
 491
 492 static struct irq_chip grpci2_irq = {
 493         .name           = "grpci2",
 494         .irq_startup    = grpci2_startup_irq,
 495         .irq_shutdown   = grpci2_shutdown_irq,
 496         .irq_mask       = grpci2_mask_irq,
 497         .irq_unmask     = grpci2_unmask_irq,
 498 };
 499
 500 /* Handle one or multiple IRQs from the PCI core */
 501 static void grpci2_pci_flow_irq(unsigned int irq, struct irq_desc *desc)
 502 {
 503         struct grpci2_priv *priv = grpci2priv;
 504         int i, ack = 0;
 505         unsigned int ctrl, sts_cap, pci_ints;
 506
 507         ctrl = REGLOAD(priv->regs->ctrl);
 508         sts_cap = REGLOAD(priv->regs->sts_cap);
 509
 510         /* Error Interrupt? */
 511         if (sts_cap & STS_ERR_IRQ) {
 512                 generic_handle_irq(priv->virq_err);
 513                 ack = 1;
 514         }
 515
 516         /* PCI Interrupt? */
 517         pci_ints = ((~sts_cap) >> STS_INTSTS_BIT) & ctrl & CTRL_HOSTINT;
 518         if (pci_ints) {
 519                 /* Call respective PCI Interrupt handler */
 520                 for (i = 0; i < 4; i++) {
 521                         if (pci_ints & (1 << i))
 522                                 generic_handle_irq(priv->irq_map[i]);
 523                 }
 524                 ack = 1;
 525         }
 526
 527         /*
 528          * Decode DMA Interrupt only when shared with Err and PCI INTX#, when
 529          * the DMA is a unique IRQ the DMA interrupts doesn't end up here, they
 530          * goes directly to DMA ISR.
 531          */
 532         if ((priv->irq_mode == 0) && (sts_cap & (STS_IDMA | STS_IDMAERR))) {
 533                 generic_handle_irq(priv->virq_dma);
 534                 ack = 1;
 535         }
 536
 537         /*
 538          * Call "first level" IRQ chip end-of-irq handler. It will ACK LEON IRQ
 539          * Controller, this must be done after IRQ sources have been handled to
 540          * avoid double IRQ generation
 541          */
 542         if (ack)
 543                 desc->irq_data.chip->irq_eoi(&desc->irq_data);
 544 }
 545
 546 /* Create a virtual IRQ */
 547 static unsigned int grpci2_build_device_irq(unsigned int irq)
 548 {
 549         unsigned int virq = 0, pil;
 550
 551         pil = 1 << 8;
 552         virq = irq_alloc(irq, pil);
 553         if (virq == 0)
 554                 goto out;
 555
 556         irq_set_chip_and_handler_name(virq, &grpci2_irq, handle_simple_irq,
 557                                       "pcilvl");
 558         irq_set_chip_data(virq, (void *)irq);
 559
 560 out:
 561         return virq;
 562 }
 563
 564 static void grpci2_hw_init(struct grpci2_priv *priv)
 565 {
 566         u32 ahbadr, pciadr, bar_sz, capptr, io_map, data;
 567         struct grpci2_regs __iomem *regs = priv->regs;
 568         int i;
 569         struct grpci2_barcfg *barcfg = priv->tgtbars;
 570
 571         /* Reset any earlier setup */
 572         if (priv->do_reset) {
 573                 printk(KERN_INFO "GRPCI2: Resetting PCI bus\n");
 574                 REGSTORE(regs->ctrl, CTRL_RESET);
 575                 ssleep(1); /* Wait for boards to settle */
 576         }
 577         REGSTORE(regs->ctrl, 0);
 578         REGSTORE(regs->sts_cap, ~0); /* Clear Status */
 579         REGSTORE(regs->dma_ctrl, 0);
 580         REGSTORE(regs->dma_bdbase, 0);
 581
 582         /* Translate I/O accesses to 0, I/O Space always @ PCI low 64Kbytes */
 583         REGSTORE(regs->io_map, REGLOAD(regs->io_map) & 0x0000ffff);
 584
 585         /* set 1:1 mapping between AHB -> PCI memory space, for all Masters
 586          * Each AHB master has it's own mapping registers. Max 16 AHB masters.
 587          */
 588         for (i = 0; i < 16; i++)
 589                 REGSTORE(regs->ahbmst_map[i], priv->pci_area);
 590
 591         /* Get the GRPCI2 Host PCI ID */
 592         grpci2_cfg_r32(priv, TGT, 0, PCI_VENDOR_ID, &priv->pciid);
 593
 594         /* Get address to first (always defined) capability structure */
 595         grpci2_cfg_r8(priv, TGT, 0, PCI_CAPABILITY_LIST, &capptr);
 596
 597         /* Enable/Disable Byte twisting */
 598         grpci2_cfg_r32(priv, TGT, 0, capptr+CAP9_IOMAP_OFS, &io_map);
 599         io_map = (io_map & ~0x1) | (priv->bt_enabled ? 1 : 0);
 600         grpci2_cfg_w32(priv, TGT, 0, capptr+CAP9_IOMAP_OFS, io_map);
 601
 602         /* Setup the Host's PCI Target BARs for other peripherals to access,
 603          * and do DMA to the host's memory. The target BARs can be sized and
 604          * enabled individually.
 605          *
 606          * User may set custom target BARs, but default is:
 607          * The first BARs is used to map kernel low (DMA is part of normal
 608          * region on sparc which is SRMMU_MAXMEM big) main memory 1:1 to the
 609          * PCI bus, the other BARs are disabled. We assume that the first BAR
 610          * is always available.
 611          */
 612         for (i = 0; i < 6; i++) {
 613                 if (barcfg[i].pciadr != ~0 && barcfg[i].ahbadr != ~0) {
 614                         /* Target BARs must have the proper alignment */
 615                         ahbadr = barcfg[i].ahbadr;
 616                         pciadr = barcfg[i].pciadr;
 617                         bar_sz = ((pciadr - 1) & ~pciadr) + 1;
 618                 } else {
 619                         if (i == 0) {
 620                                 /* Map main memory */
 621                                 bar_sz = 0xf0000008; /* 256MB prefetchable */
 622                                 ahbadr = 0xf0000000 & (u32)__pa(PAGE_ALIGN(
 623                                         (unsigned long) &_end));
 624                                 pciadr = ahbadr;
 625                         } else {
 626                                 bar_sz = 0;
 627                                 ahbadr = 0;
 628                                 pciadr = 0;
 629                         }
 630                 }
 631                 grpci2_cfg_w32(priv, TGT, 0, capptr+CAP9_BARSIZE_OFS+i*4,
 632                                 bar_sz);
 633                 grpci2_cfg_w32(priv, TGT, 0, PCI_BASE_ADDRESS_0+i*4, pciadr);
 634                 grpci2_cfg_w32(priv, TGT, 0, capptr+CAP9_BAR_OFS+i*4, ahbadr);
 635                 printk(KERN_INFO "        TGT BAR[%d]: 0x%08x (PCI)-> 0x%08x\n",
 636                         i, pciadr, ahbadr);
 637         }
 638
 639         /* set as bus master and enable pci memory responses */
 640         grpci2_cfg_r32(priv, TGT, 0, PCI_COMMAND, &data);
 641         data |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
 642         grpci2_cfg_w32(priv, TGT, 0, PCI_COMMAND, data);
 643
 644         /* Enable Error respone (CPU-TRAP) on illegal memory access. */
 645         REGSTORE(regs->ctrl, CTRL_ER | CTRL_PE);
 646 }
 647
 648 static irqreturn_t grpci2_jump_interrupt(int irq, void *arg)
 649 {
 650         printk(KERN_ERR "GRPCI2: Jump IRQ happened\n");
 651         return IRQ_NONE;
 652 }
 653
 654 /* Handle GRPCI2 Error Interrupt */
 655 static irqreturn_t grpci2_err_interrupt(int irq, void *arg)
 656 {
 657         struct grpci2_priv *priv = arg;
 658         struct grpci2_regs __iomem *regs = priv->regs;
 659         unsigned int status;
 660
 661         status = REGLOAD(regs->sts_cap);
 662         if ((status & STS_ERR_IRQ) == 0)
 663                 return IRQ_NONE;
 664
 665         if (status & STS_IPARERR)
 666                 printk(KERN_ERR "GRPCI2: Parity Error\n");
 667
 668         if (status & STS_ITGTABRT)
 669                 printk(KERN_ERR "GRPCI2: Target Abort\n");
 670
 671         if (status & STS_IMSTABRT)
 672                 printk(KERN_ERR "GRPCI2: Master Abort\n");
 673
 674         if (status & STS_ISYSERR)
 675                 printk(KERN_ERR "GRPCI2: System Error\n");
 676
 677         /* Clear handled INT TYPE IRQs */
 678         REGSTORE(regs->sts_cap, status & STS_ERR_IRQ);
 679
 680         return IRQ_HANDLED;
 681 }
 682
 683 static int grpci2_of_probe(struct platform_device *ofdev)
 684 {
 685         struct grpci2_regs __iomem *regs;
 686         struct grpci2_priv *priv;
 687         int err, i, len;
 688         const int *tmp;
 689         unsigned int capability;
 690
 691         if (grpci2priv) {
 692                 printk(KERN_ERR "GRPCI2: only one GRPCI2 core supported\n");
 693                 return -ENODEV;
 694         }
 695
 696         if (ofdev->num_resources < 3) {
 697                 printk(KERN_ERR "GRPCI2: not enough APB/AHB resources\n");
 698                 return -EIO;
 699         }
 700
 701         /* Find Device Address */
 702         regs = of_ioremap(&ofdev->resource[0], 0,
 703                           resource_size(&ofdev->resource[0]),
 704                           "grlib-grpci2 regs");
 705         if (regs == NULL) {
 706                 printk(KERN_ERR "GRPCI2: ioremap failed\n");
 707                 return -EIO;
 708         }
 709
 710         /*
 711          * Check that we're in Host Slot and that we can act as a Host Bridge
 712          * and not only as target.
 713          */
 714         capability = REGLOAD(regs->sts_cap);
 715         if ((capability & STS_HOST) || !(capability & STS_MST)) {
 716                 printk(KERN_INFO "GRPCI2: not in host system slot\n");
 717                 err = -EIO;
 718                 goto err1;
 719         }
 720
 721         priv = grpci2priv = kzalloc(sizeof(struct grpci2_priv), GFP_KERNEL);
 722         if (grpci2priv == NULL) {
 723                 err = -ENOMEM;
 724                 goto err1;
 725         }
 726         memset(grpci2priv, 0, sizeof(*grpci2priv));
 727         priv->regs = regs;
 728         priv->irq = ofdev->archdata.irqs[0]; /* BASE IRQ */
 729         priv->irq_mode = (capability & STS_IRQMODE) >> STS_IRQMODE_BIT;
 730
 731         printk(KERN_INFO "GRPCI2: host found at %p, irq%d\n", regs, priv->irq);
 732
 733         /* Byte twisting should be made configurable from kernel command line */
 734         priv->bt_enabled = 1;
 735
 736         /* Let user do custom Target BAR assignment */
 737         tmp = of_get_property(ofdev->dev.of_node, "barcfg", &len);
 738         if (tmp && (len == 2*4*6))
 739                 memcpy(priv->tgtbars, tmp, 2*4*6);
 740         else
 741                 memset(priv->tgtbars, -1, 2*4*6);
 742
 743         /* Limit IRQ unmasking in irq_mode 2 and 3 */
 744         tmp = of_get_property(ofdev->dev.of_node, "irq_mask", &len);
 745         if (tmp && (len == 4))
 746                 priv->do_reset = *tmp;
 747         else
 748                 priv->irq_mask = 0xf;
 749
 750         /* Optional PCI reset. Force PCI reset on startup */
 751         tmp = of_get_property(ofdev->dev.of_node, "reset", &len);
 752         if (tmp && (len == 4))
 753                 priv->do_reset = *tmp;
 754         else
 755                 priv->do_reset = 0;
 756
 757         /* Find PCI Memory, I/O and Configuration Space Windows */
 758         priv->pci_area = ofdev->resource[1].start;
 759         priv->pci_area_end = ofdev->resource[1].end+1;
 760         priv->pci_io = ofdev->resource[2].start;
 761         priv->pci_conf = ofdev->resource[2].start + 0x10000;
 762         priv->pci_conf_end = priv->pci_conf + 0x10000;
 763         priv->pci_io_va = (unsigned long)ioremap(priv->pci_io, 0x10000);
 764         if (!priv->pci_io_va) {
 765                 err = -EIO;
 766                 goto err2;
 767         }
 768
 769         printk(KERN_INFO
 770                 "GRPCI2: MEMORY SPACE [0x%08lx - 0x%08lx]\n"
 771                 "        I/O    SPACE [0x%08lx - 0x%08lx]\n"
 772                 "        CONFIG SPACE [0x%08lx - 0x%08lx]\n",
 773                 priv->pci_area, priv->pci_area_end-1,
 774                 priv->pci_io, priv->pci_conf-1,
 775                 priv->pci_conf, priv->pci_conf_end-1);
 776
 777         /*
 778          * I/O Space resources in I/O Window mapped into Virtual Adr Space
 779          * We never use low 4KB because some devices seem have problems using
 780          * address 0.
 781          */
 782         memset(&priv->info.io_space, 0, sizeof(struct resource));
 783         priv->info.io_space.name = "GRPCI2 PCI I/O Space";
 784         priv->info.io_space.start = priv->pci_io_va + 0x1000;
 785         priv->info.io_space.end = priv->pci_io_va + 0x10000 - 1;
 786         priv->info.io_space.flags = IORESOURCE_IO;
 787
 788         /*
 789          * GRPCI2 has no prefetchable memory, map everything as
 790          * non-prefetchable memory
 791          */
 792         memset(&priv->info.mem_space, 0, sizeof(struct resource));
 793         priv->info.mem_space.name = "GRPCI2 PCI MEM Space";
 794         priv->info.mem_space.start = priv->pci_area;
 795         priv->info.mem_space.end = priv->pci_area_end - 1;
 796         priv->info.mem_space.flags = IORESOURCE_MEM;
 797
 798         if (request_resource(&iomem_resource, &priv->info.mem_space) < 0)
 799                 goto err3;
 800         if (request_resource(&ioport_resource, &priv->info.io_space) < 0)
 801                 goto err4;
 802
 803         /* setup maximum supported PCI buses */
 804         priv->info.busn.name = "GRPCI2 busn";
 805         priv->info.busn.start = 0;
 806         priv->info.busn.end = 255;
 807
 808         grpci2_hw_init(priv);
 809
 810         /*
 811          * Get PCI Interrupt to System IRQ mapping and setup IRQ handling
 812          * Error IRQ always on PCI INTA.
 813          */
 814         if (priv->irq_mode < 2) {
 815                 /* All PCI interrupts are shared using the same system IRQ */
 816                 leon_update_virq_handling(priv->irq, grpci2_pci_flow_irq,
 817                                          "pcilvl", 0);
 818
 819                 priv->irq_map[0] = grpci2_build_device_irq(1);
 820                 priv->irq_map[1] = grpci2_build_device_irq(2);
 821                 priv->irq_map[2] = grpci2_build_device_irq(3);
 822                 priv->irq_map[3] = grpci2_build_device_irq(4);
 823
 824                 priv->virq_err = grpci2_build_device_irq(5);
 825                 if (priv->irq_mode & 1)
 826                         priv->virq_dma = ofdev->archdata.irqs[1];
 827                 else
 828                         priv->virq_dma = grpci2_build_device_irq(6);
 829
 830                 /* Enable IRQs on LEON IRQ controller */
 831                 err = request_irq(priv->irq, grpci2_jump_interrupt, 0,
 832                                         "GRPCI2_JUMP", priv);
 833                 if (err)
 834                         printk(KERN_ERR "GRPCI2: ERR IRQ request failed\n");
 835         } else {
 836                 /* All PCI interrupts have an unique IRQ interrupt */
 837                 for (i = 0; i < 4; i++) {
 838                         /* Make LEON IRQ layer handle level IRQ by acking */
 839                         leon_update_virq_handling(ofdev->archdata.irqs[i],
 840                                                  handle_fasteoi_irq, "pcilvl",
 841                                                  1);
 842                         priv->irq_map[i] = ofdev->archdata.irqs[i];
 843                 }
 844                 priv->virq_err = priv->irq_map[0];
 845                 if (priv->irq_mode & 1)
 846                         priv->virq_dma = ofdev->archdata.irqs[4];
 847                 else
 848                         priv->virq_dma = priv->irq_map[0];
 849
 850                 /* Unmask all PCI interrupts, request_irq will not do that */
 851                 REGSTORE(regs->ctrl, REGLOAD(regs->ctrl)|(priv->irq_mask&0xf));
 852         }
 853
 854         /* Setup IRQ handler for non-configuration space access errors */
 855         err = request_irq(priv->virq_err, grpci2_err_interrupt, IRQF_SHARED,
 856                                 "GRPCI2_ERR", priv);
 857         if (err) {
 858                 printk(KERN_DEBUG "GRPCI2: ERR VIRQ request failed: %d\n", err);
 859                 goto err5;
 860         }
 861
 862         /*
 863          * Enable Error Interrupts. PCI interrupts are unmasked once request_irq
 864          * is called by the PCI Device drivers
 865          */
 866         REGSTORE(regs->ctrl, REGLOAD(regs->ctrl) | CTRL_EI | CTRL_SI);
 867
 868         /* Init common layer and scan buses */
 869         priv->info.ops = &grpci2_ops;
 870         priv->info.map_irq = grpci2_map_irq;
 871         leon_pci_init(ofdev, &priv->info);
 872
 873         return 0;
 874
 875 err5:
 876         release_resource(&priv->info.io_space);
 877 err4:
 878         release_resource(&priv->info.mem_space);
 879 err3:
 880         err = -ENOMEM;
 881         iounmap((void __iomem *)priv->pci_io_va);
 882 err2:
 883         kfree(priv);
 884 err1:
 885         of_iounmap(&ofdev->resource[0], regs,
 886                 resource_size(&ofdev->resource[0]));
 887         return err;
 888 }
 889
 890 static struct of_device_id grpci2_of_match[] = {
 891         {
 892          .name = "GAISLER_GRPCI2",
 893          },
 894         {
 895          .name = "01_07c",
 896          },
 897         {},
 898 };
 899
 900 static struct platform_driver grpci2_of_driver = {
 901         .driver = {
 902                 .name = "grpci2",
 903                 .owner = THIS_MODULE,
 904                 .of_match_table = grpci2_of_match,
 905         },
 906         .probe = grpci2_of_probe,
 907 };
 908
 909 static int __init grpci2_init(void)
 910 {
 911         return platform_driver_register(&grpci2_of_driver);
 912 }
 913
 914 subsys_initcall(grpci2_init);