target/linux/generic-2.6/files/drivers/ssb/driver_pcicore.c

   1 /*
   2  * Sonics Silicon Backplane
   3  * Broadcom PCI-core driver
   4  *
   5  * Copyright 2005, Broadcom Corporation
   6  * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
   7  *
   8  * Licensed under the GNU/GPL. See COPYING for details.
   9  */
  10
  11 #include <linux/ssb/ssb.h>
  12 #include <linux/pci.h>
  13 #include <linux/delay.h>
  14
  15 #include "ssb_private.h"
  16
  17
  18 static inline
  19 u32 pcicore_read32(struct ssb_pcicore *pc, u16 offset)
  20 {
  21         return ssb_read32(pc->dev, offset);
  22 }
  23
  24 static inline
  25 void pcicore_write32(struct ssb_pcicore *pc, u16 offset, u32 value)
  26 {
  27         ssb_write32(pc->dev, offset, value);
  28 }
  29
  30 /**************************************************
  31  * Code for hostmode operation.
  32  **************************************************/
  33
  34 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
  35
  36 #include <asm/paccess.h>
  37 /* Probe a 32bit value on the bus and catch bus exceptions.
  38  * Returns nonzero on a bus exception.
  39  * This is MIPS specific */
  40 #define mips_busprobe32(val, addr)      get_dbe((val), ((u32 *)(addr)))
  41
  42 /* Assume one-hot slot wiring */
  43 #define SSB_PCI_SLOT_MAX        16
  44
  45 /* Global lock is OK, as we won't have more than one extpci anyway. */
  46 static DEFINE_SPINLOCK(cfgspace_lock);
  47 /* Core to access the external PCI config space. Can only have one. */
  48 static struct ssb_pcicore *extpci_core;
  49
  50 static u32 ssb_pcicore_pcibus_iobase = 0x100;
  51 static u32 ssb_pcicore_pcibus_membase = SSB_PCI_DMA;
  52
  53 int pcibios_plat_dev_init(struct pci_dev *d)
  54 {
  55         struct resource *res;
  56         int pos, size;
  57         u32 *base;
  58
  59         ssb_printk(KERN_INFO "PCI: Fixing up device %s\n",
  60                    pci_name(d));
  61
  62         /* Fix up resource bases */
  63         for (pos = 0; pos < 6; pos++) {
  64                 res = &d->resource[pos];
  65                 if (res->flags & IORESOURCE_IO)
  66                         base = &ssb_pcicore_pcibus_iobase;
  67                 else
  68                         base = &ssb_pcicore_pcibus_membase;
  69                 if (res->end) {
  70                         size = res->end - res->start + 1;
  71                         if (*base & (size - 1))
  72                                 *base = (*base + size) & ~(size - 1);
  73                         res->start = *base;
  74                         res->end = res->start + size - 1;
  75                         *base += size;
  76                         pci_write_config_dword(d, PCI_BASE_ADDRESS_0 + (pos << 2), res->start);
  77                 }
  78                 /* Fix up PCI bridge BAR0 only */
  79                 if (d->bus->number == 0 && PCI_SLOT(d->devfn) == 0)
  80                         break;
  81         }
  82         /* Fix up interrupt lines */
  83         d->irq = ssb_mips_irq(extpci_core->dev) + 2;
  84         pci_write_config_byte(d, PCI_INTERRUPT_LINE, d->irq);
  85
  86         return 0;
  87 }
  88
  89 static void __init ssb_fixup_pcibridge(struct pci_dev *dev)
  90 {
  91         if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) != 0)
  92                 return;
  93
  94         ssb_printk(KERN_INFO "PCI: fixing up bridge\n");
  95
  96         /* Enable PCI bridge bus mastering and memory space */
  97         pci_set_master(dev);
  98         pcibios_enable_device(dev, ~0);
  99
 100         /* Enable PCI bridge BAR1 prefetch and burst */
 101         pci_write_config_dword(dev, SSB_BAR1_CONTROL, 3);
 102
 103         /* Make sure our latency is high enough to handle the devices behind us */
 104         pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xa8);
 105 }
 106 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_fixup_pcibridge);
 107
 108 int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 109 {
 110         return ssb_mips_irq(extpci_core->dev) + 2;
 111 }
 112
 113 static u32 get_cfgspace_addr(struct ssb_pcicore *pc,
 114                              unsigned int bus, unsigned int dev,
 115                              unsigned int func, unsigned int off)
 116 {
 117         u32 addr = 0;
 118         u32 tmp;
 119
 120         if (unlikely(pc->cardbusmode && dev > 1))
 121                 goto out;
 122         if (bus == 0) {
 123                 /* Type 0 transaction */
 124                 if (unlikely(dev >= SSB_PCI_SLOT_MAX))
 125                         goto out;
 126                 /* Slide the window */
 127                 tmp = SSB_PCICORE_SBTOPCI_CFG0;
 128                 tmp |= ((1 << (dev + 16)) & SSB_PCICORE_SBTOPCI1_MASK);
 129                 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1, tmp);
 130                 /* Calculate the address */
 131                 addr = SSB_PCI_CFG;
 132                 addr |= ((1 << (dev + 16)) & ~SSB_PCICORE_SBTOPCI1_MASK);
 133                 addr |= (func << 8);
 134                 addr |= (off & ~3);
 135         } else {
 136                 /* Type 1 transaction */
 137                 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
 138                                 SSB_PCICORE_SBTOPCI_CFG1);
 139                 /* Calculate the address */
 140                 addr = SSB_PCI_CFG;
 141                 addr |= (bus << 16);
 142                 addr |= (dev << 11);
 143                 addr |= (func << 8);
 144                 addr |= (off & ~3);
 145         }
 146 out:
 147         return addr;
 148 }
 149
 150 static int ssb_extpci_read_config(struct ssb_pcicore *pc,
 151                                   unsigned int bus, unsigned int dev,
 152                                   unsigned int func, unsigned int off,
 153                                   void *buf, int len)
 154 {
 155         int err = -EINVAL;
 156         u32 addr, val;
 157         void __iomem *mmio;
 158
 159         SSB_WARN_ON(!pc->hostmode);
 160         if (unlikely(len != 1 && len != 2 && len != 4))
 161                 goto out;
 162         addr = get_cfgspace_addr(pc, bus, dev, func, off);
 163         if (unlikely(!addr))
 164                 goto out;
 165         err = -ENOMEM;
 166         mmio = ioremap_nocache(addr, len);
 167         if (!mmio)
 168                 goto out;
 169
 170         if (mips_busprobe32(val, mmio)) {
 171                 val = 0xffffffff;
 172                 goto unmap;
 173         }
 174
 175         val = readl(mmio);
 176         val >>= (8 * (off & 3));
 177
 178         switch (len) {
 179         case 1:
 180                 *((u8 *)buf) = (u8)val;
 181                 break;
 182         case 2:
 183                 *((u16 *)buf) = (u16)val;
 184                 break;
 185         case 4:
 186                 *((u32 *)buf) = (u32)val;
 187                 break;
 188         }
 189         err = 0;
 190 unmap:
 191         iounmap(mmio);
 192 out:
 193         return err;
 194 }
 195
 196 static int ssb_extpci_write_config(struct ssb_pcicore *pc,
 197                                    unsigned int bus, unsigned int dev,
 198                                    unsigned int func, unsigned int off,
 199                                    const void *buf, int len)
 200 {
 201         int err = -EINVAL;
 202         u32 addr, val = 0;
 203         void __iomem *mmio;
 204
 205         SSB_WARN_ON(!pc->hostmode);
 206         if (unlikely(len != 1 && len != 2 && len != 4))
 207                 goto out;
 208         addr = get_cfgspace_addr(pc, bus, dev, func, off);
 209         if (unlikely(!addr))
 210                 goto out;
 211         err = -ENOMEM;
 212         mmio = ioremap_nocache(addr, len);
 213         if (!mmio)
 214                 goto out;
 215
 216         if (mips_busprobe32(val, mmio)) {
 217                 val = 0xffffffff;
 218                 goto unmap;
 219         }
 220
 221         switch (len) {
 222         case 1:
 223                 val = readl(mmio);
 224                 val &= ~(0xFF << (8 * (off & 3)));
 225                 val |= *((const u8 *)buf) << (8 * (off & 3));
 226                 break;
 227         case 2:
 228                 val = readl(mmio);
 229                 val &= ~(0xFFFF << (8 * (off & 3)));
 230                 val |= *((const u16 *)buf) << (8 * (off & 3));
 231                 break;
 232         case 4:
 233                 val = *((const u32 *)buf);
 234                 break;
 235         }
 236         writel(val, mmio);
 237
 238         err = 0;
 239 unmap:
 240         iounmap(mmio);
 241 out:
 242         return err;
 243 }
 244
 245 static int ssb_pcicore_read_config(struct pci_bus *bus, unsigned int devfn,
 246                                    int reg, int size, u32 *val)
 247 {
 248         unsigned long flags;
 249         int err;
 250
 251         spin_lock_irqsave(&cfgspace_lock, flags);
 252         err = ssb_extpci_read_config(extpci_core, bus->number, PCI_SLOT(devfn),
 253                                      PCI_FUNC(devfn), reg, val, size);
 254         spin_unlock_irqrestore(&cfgspace_lock, flags);
 255
 256         return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
 257 }
 258
 259 static int ssb_pcicore_write_config(struct pci_bus *bus, unsigned int devfn,
 260                                     int reg, int size, u32 val)
 261 {
 262         unsigned long flags;
 263         int err;
 264
 265         spin_lock_irqsave(&cfgspace_lock, flags);
 266         err = ssb_extpci_write_config(extpci_core, bus->number, PCI_SLOT(devfn),
 267                                       PCI_FUNC(devfn), reg, &val, size);
 268         spin_unlock_irqrestore(&cfgspace_lock, flags);
 269
 270         return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
 271 }
 272
 273 static struct pci_ops ssb_pcicore_pciops = {
 274         .read   = ssb_pcicore_read_config,
 275         .write  = ssb_pcicore_write_config,
 276 };
 277
 278 static struct resource ssb_pcicore_mem_resource = {
 279         .name   = "SSB PCIcore external memory",
 280         .start  = SSB_PCI_DMA,
 281         .end    = SSB_PCI_DMA + SSB_PCI_DMA_SZ - 1,
 282         .flags  = IORESOURCE_MEM,
 283 };
 284
 285 static struct resource ssb_pcicore_io_resource = {
 286         .name   = "SSB PCIcore external I/O",
 287         .start  = 0x100,
 288         .end    = 0x7FF,
 289         .flags  = IORESOURCE_IO,
 290 };
 291
 292 static struct pci_controller ssb_pcicore_controller = {
 293         .pci_ops        = &ssb_pcicore_pciops,
 294         .io_resource    = &ssb_pcicore_io_resource,
 295         .mem_resource   = &ssb_pcicore_mem_resource,
 296         .mem_offset     = 0x24000000,
 297 };
 298
 299 static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc)
 300 {
 301         u32 val;
 302
 303         if (WARN_ON(extpci_core))
 304                 return;
 305         extpci_core = pc;
 306
 307         ssb_dprintk(KERN_INFO PFX "PCIcore in host mode found\n");
 308         /* Reset devices on the external PCI bus */
 309         val = SSB_PCICORE_CTL_RST_OE;
 310         val |= SSB_PCICORE_CTL_CLK_OE;
 311         pcicore_write32(pc, SSB_PCICORE_CTL, val);
 312         val |= SSB_PCICORE_CTL_CLK; /* Clock on */
 313         pcicore_write32(pc, SSB_PCICORE_CTL, val);
 314         udelay(150); /* Assertion time demanded by the PCI standard */
 315         val |= SSB_PCICORE_CTL_RST; /* Deassert RST# */
 316         pcicore_write32(pc, SSB_PCICORE_CTL, val);
 317         val = SSB_PCICORE_ARBCTL_INTERN;
 318         pcicore_write32(pc, SSB_PCICORE_ARBCTL, val);
 319         udelay(1); /* Assertion time demanded by the PCI standard */
 320
 321         /*TODO cardbus mode */
 322
 323         /* 64MB I/O window */
 324         pcicore_write32(pc, SSB_PCICORE_SBTOPCI0,
 325                         SSB_PCICORE_SBTOPCI_IO);
 326         /* 64MB config space */
 327         pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
 328                         SSB_PCICORE_SBTOPCI_CFG0);
 329         /* 1GB memory window */
 330         pcicore_write32(pc, SSB_PCICORE_SBTOPCI2,
 331                         SSB_PCICORE_SBTOPCI_MEM | SSB_PCI_DMA);
 332
 333         /* Enable PCI bridge BAR0 prefetch and burst */
 334         val = PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
 335         ssb_extpci_write_config(pc, 0, 0, 0, PCI_COMMAND, &val, 2);
 336         /* Clear error conditions */
 337         val = 0;
 338         ssb_extpci_write_config(pc, 0, 0, 0, PCI_STATUS, &val, 2);
 339
 340         /* Enable PCI interrupts */
 341         pcicore_write32(pc, SSB_PCICORE_IMASK,
 342                         SSB_PCICORE_IMASK_INTA);
 343
 344         /* Ok, ready to run, register it to the system.
 345          * The following needs change, if we want to port hostmode
 346          * to non-MIPS platform. */
 347         set_io_port_base((unsigned long)ioremap_nocache(SSB_PCI_MEM, 0x04000000));
 348         /* Give some time to the PCI controller to configure itself with the new
 349          * values. Not waiting at this point causes crashes of the machine. */
 350         mdelay(10);
 351         register_pci_controller(&ssb_pcicore_controller);
 352 }
 353
 354 static int pcicore_is_in_hostmode(struct ssb_pcicore *pc)
 355 {
 356         struct ssb_bus *bus = pc->dev->bus;
 357         u16 chipid_top;
 358         u32 tmp;
 359
 360         chipid_top = (bus->chip_id & 0xFF00);
 361         if (chipid_top != 0x4700 &&
 362             chipid_top != 0x5300)
 363                 return 0;
 364
 365         if (bus->sprom.r1.boardflags_lo & SSB_PCICORE_BFL_NOPCI)
 366                 return 0;
 367
 368         /* The 200-pin BCM4712 package does not bond out PCI. Even when
 369          * PCI is bonded out, some boards may leave the pins floating. */
 370         if (bus->chip_id == 0x4712) {
 371                 if (bus->chip_package == SSB_CHIPPACK_BCM4712S)
 372                         return 0;
 373                 if (bus->chip_package == SSB_CHIPPACK_BCM4712M)
 374                         return 0;
 375         }
 376         if (bus->chip_id == 0x5350)
 377                 return 0;
 378
 379         return !mips_busprobe32(tmp, (bus->mmio + (pc->dev->core_index * SSB_CORE_SIZE)));
 380 }
 381 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
 382
 383
 384 /**************************************************
 385  * Generic and Clientmode operation code.
 386  **************************************************/
 387
 388 static void ssb_pcicore_init_clientmode(struct ssb_pcicore *pc)
 389 {
 390         /* Disable PCI interrupts. */
 391         ssb_write32(pc->dev, SSB_INTVEC, 0);
 392 }
 393
 394 void ssb_pcicore_init(struct ssb_pcicore *pc)
 395 {
 396         struct ssb_device *dev = pc->dev;
 397         struct ssb_bus *bus;
 398
 399         if (!dev)
 400                 return;
 401         bus = dev->bus;
 402         if (!ssb_device_is_enabled(dev))
 403                 ssb_device_enable(dev, 0);
 404
 405 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
 406         pc->hostmode = pcicore_is_in_hostmode(pc);
 407         if (pc->hostmode)
 408                 ssb_pcicore_init_hostmode(pc);
 409 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
 410         if (!pc->hostmode)
 411                 ssb_pcicore_init_clientmode(pc);
 412 }
 413
 414 static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address)
 415 {
 416         pcicore_write32(pc, 0x130, address);
 417         return pcicore_read32(pc, 0x134);
 418 }
 419
 420 static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data)
 421 {
 422         pcicore_write32(pc, 0x130, address);
 423         pcicore_write32(pc, 0x134, data);
 424 }
 425
 426 static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
 427                                 u8 address, u16 data)
 428 {
 429         const u16 mdio_control = 0x128;
 430         const u16 mdio_data = 0x12C;
 431         u32 v;
 432         int i;
 433
 434         v = 0x80; /* Enable Preamble Sequence */
 435         v |= 0x2; /* MDIO Clock Divisor */
 436         pcicore_write32(pc, mdio_control, v);
 437
 438         v = (1 << 30); /* Start of Transaction */
 439         v |= (1 << 28); /* Write Transaction */
 440         v |= (1 << 17); /* Turnaround */
 441         v |= (u32)device << 22;
 442         v |= (u32)address << 18;
 443         v |= data;
 444         pcicore_write32(pc, mdio_data, v);
 445         /* Wait for the device to complete the transaction */
 446         udelay(10);
 447         for (i = 0; i < 10; i++) {
 448                 v = pcicore_read32(pc, mdio_control);
 449                 if (v & 0x100 /* Trans complete */)
 450                         break;
 451                 msleep(1);
 452         }
 453         pcicore_write32(pc, mdio_control, 0);
 454 }
 455
 456 static void ssb_broadcast_value(struct ssb_device *dev,
 457                                 u32 address, u32 data)
 458 {
 459         /* This is used for both, PCI and ChipCommon core, so be careful. */
 460         BUILD_BUG_ON(SSB_PCICORE_BCAST_ADDR != SSB_CHIPCO_BCAST_ADDR);
 461         BUILD_BUG_ON(SSB_PCICORE_BCAST_DATA != SSB_CHIPCO_BCAST_DATA);
 462
 463         ssb_write32(dev, SSB_PCICORE_BCAST_ADDR, address);
 464         ssb_read32(dev, SSB_PCICORE_BCAST_ADDR); /* flush */
 465         ssb_write32(dev, SSB_PCICORE_BCAST_DATA, data);
 466         ssb_read32(dev, SSB_PCICORE_BCAST_DATA); /* flush */
 467 }
 468
 469 static void ssb_commit_settings(struct ssb_bus *bus)
 470 {
 471         struct ssb_device *dev;
 472
 473         dev = bus->chipco.dev ? bus->chipco.dev : bus->pcicore.dev;
 474         if (WARN_ON(!dev))
 475                 return;
 476         /* This forces an update of the cached registers. */
 477         ssb_broadcast_value(dev, 0xFD8, 0);
 478 }
 479
 480 int ssb_pcicore_dev_irqvecs_enable(struct ssb_pcicore *pc,
 481                                    struct ssb_device *dev)
 482 {
 483         struct ssb_device *pdev = pc->dev;
 484         struct ssb_bus *bus;
 485         int err = 0;
 486         u32 tmp;
 487
 488         might_sleep();
 489
 490         if (!pdev)
 491                 goto out;
 492         bus = pdev->bus;
 493
 494         /* Enable interrupts for this device. */
 495         if (bus->host_pci &&
 496             ((pdev->id.revision >= 6) || (pdev->id.coreid == SSB_DEV_PCIE))) {
 497                 u32 coremask;
 498
 499                 /* Calculate the "coremask" for the device. */
 500                 coremask = (1 << dev->core_index);
 501
 502                 err = pci_read_config_dword(bus->host_pci, SSB_PCI_IRQMASK, &tmp);
 503                 if (err)
 504                         goto out;
 505                 tmp |= coremask << 8;
 506                 err = pci_write_config_dword(bus->host_pci, SSB_PCI_IRQMASK, tmp);
 507                 if (err)
 508                         goto out;
 509         } else {
 510                 u32 intvec;
 511
 512                 intvec = ssb_read32(pdev, SSB_INTVEC);
 513                 if ((bus->chip_id & 0xFF00) == 0x4400) {
 514                         /* Workaround: On the BCM44XX the BPFLAG routing
 515                          * bit is wrong. Use a hardcoded constant. */
 516                         intvec |= 0x00000002;
 517                 } else {
 518                         tmp = ssb_read32(dev, SSB_TPSFLAG);
 519                         tmp &= SSB_TPSFLAG_BPFLAG;
 520                         intvec |= tmp;
 521                 }
 522                 ssb_write32(pdev, SSB_INTVEC, intvec);
 523         }
 524
 525         /* Setup PCIcore operation. */
 526         if (pc->setup_done)
 527                 goto out;
 528         if (pdev->id.coreid == SSB_DEV_PCI) {
 529                 tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
 530                 tmp |= SSB_PCICORE_SBTOPCI_PREF;
 531                 tmp |= SSB_PCICORE_SBTOPCI_BURST;
 532                 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
 533
 534                 if (pdev->id.revision < 5) {
 535                         tmp = ssb_read32(pdev, SSB_IMCFGLO);
 536                         tmp &= ~SSB_IMCFGLO_SERTO;
 537                         tmp |= 2;
 538                         tmp &= ~SSB_IMCFGLO_REQTO;
 539                         tmp |= 3 << SSB_IMCFGLO_REQTO_SHIFT;
 540                         ssb_write32(pdev, SSB_IMCFGLO, tmp);
 541                         ssb_commit_settings(bus);
 542                 } else if (pdev->id.revision >= 11) {
 543                         tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
 544                         tmp |= SSB_PCICORE_SBTOPCI_MRM;
 545                         pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
 546                 }
 547         } else {
 548                 WARN_ON(pdev->id.coreid != SSB_DEV_PCIE);
 549                 //TODO: Better make defines for all these magic PCIE values.
 550                 if ((pdev->id.revision == 0) || (pdev->id.revision == 1)) {
 551                         /* TLP Workaround register. */
 552                         tmp = ssb_pcie_read(pc, 0x4);
 553                         tmp |= 0x8;
 554                         ssb_pcie_write(pc, 0x4, tmp);
 555                 }
 556                 if (pdev->id.revision == 0) {
 557                         const u8 serdes_rx_device = 0x1F;
 558
 559                         ssb_pcie_mdio_write(pc, serdes_rx_device,
 560                                             2 /* Timer */, 0x8128);
 561                         ssb_pcie_mdio_write(pc, serdes_rx_device,
 562                                             6 /* CDR */, 0x0100);
 563                         ssb_pcie_mdio_write(pc, serdes_rx_device,
 564                                             7 /* CDR BW */, 0x1466);
 565                 } else if (pdev->id.revision == 1) {
 566                         /* DLLP Link Control register. */
 567                         tmp = ssb_pcie_read(pc, 0x100);
 568                         tmp |= 0x40;
 569                         ssb_pcie_write(pc, 0x100, tmp);
 570                 }
 571         }
 572         pc->setup_done = 1;
 573 out:
 574         return err;
 575 }
 576 EXPORT_SYMBOL(ssb_pcicore_dev_irqvecs_enable);