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 <m@bues.ch>
   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/export.h>
  14 #include <linux/delay.h>
  15 #include <linux/ssb/ssb_embedded.h>
  16
  17 #include "ssb_private.h"
  18
  19 static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address);
  20 static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data);
  21 static u16 ssb_pcie_mdio_read(struct ssb_pcicore *pc, u8 device, u8 address);
  22 static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
  23                                 u8 address, u16 data);
  24
  25 static inline
  26 u32 pcicore_read32(struct ssb_pcicore *pc, u16 offset)
  27 {
  28         return ssb_read32(pc->dev, offset);
  29 }
  30
  31 static inline
  32 void pcicore_write32(struct ssb_pcicore *pc, u16 offset, u32 value)
  33 {
  34         ssb_write32(pc->dev, offset, value);
  35 }
  36
  37 static inline
  38 u16 pcicore_read16(struct ssb_pcicore *pc, u16 offset)
  39 {
  40         return ssb_read16(pc->dev, offset);
  41 }
  42
  43 static inline
  44 void pcicore_write16(struct ssb_pcicore *pc, u16 offset, u16 value)
  45 {
  46         ssb_write16(pc->dev, offset, value);
  47 }
  48
  49 /**************************************************
  50  * Code for hostmode operation.
  51  **************************************************/
  52
  53 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
  54
  55 #include <asm/paccess.h>
  56 /* Probe a 32bit value on the bus and catch bus exceptions.
  57  * Returns nonzero on a bus exception.
  58  * This is MIPS specific */
  59 #define mips_busprobe32(val, addr)      get_dbe((val), ((u32 *)(addr)))
  60
  61 /* Assume one-hot slot wiring */
  62 #define SSB_PCI_SLOT_MAX        16
  63
  64 /* Global lock is OK, as we won't have more than one extpci anyway. */
  65 static DEFINE_SPINLOCK(cfgspace_lock);
  66 /* Core to access the external PCI config space. Can only have one. */
  67 static struct ssb_pcicore *extpci_core;
  68
  69
  70 static u32 get_cfgspace_addr(struct ssb_pcicore *pc,
  71                              unsigned int bus, unsigned int dev,
  72                              unsigned int func, unsigned int off)
  73 {
  74         u32 addr = 0;
  75         u32 tmp;
  76
  77         /* We do only have one cardbus device behind the bridge. */
  78         if (pc->cardbusmode && (dev > 1))
  79                 goto out;
  80
  81         if (bus == 0) {
  82                 /* Type 0 transaction */
  83                 if (unlikely(dev >= SSB_PCI_SLOT_MAX))
  84                         goto out;
  85                 /* Slide the window */
  86                 tmp = SSB_PCICORE_SBTOPCI_CFG0;
  87                 tmp |= ((1 << (dev + 16)) & SSB_PCICORE_SBTOPCI1_MASK);
  88                 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1, tmp);
  89                 /* Calculate the address */
  90                 addr = SSB_PCI_CFG;
  91                 addr |= ((1 << (dev + 16)) & ~SSB_PCICORE_SBTOPCI1_MASK);
  92                 addr |= (func << 8);
  93                 addr |= (off & ~3);
  94         } else {
  95                 /* Type 1 transaction */
  96                 pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
  97                                 SSB_PCICORE_SBTOPCI_CFG1);
  98                 /* Calculate the address */
  99                 addr = SSB_PCI_CFG;
 100                 addr |= (bus << 16);
 101                 addr |= (dev << 11);
 102                 addr |= (func << 8);
 103                 addr |= (off & ~3);
 104         }
 105 out:
 106         return addr;
 107 }
 108
 109 static int ssb_extpci_read_config(struct ssb_pcicore *pc,
 110                                   unsigned int bus, unsigned int dev,
 111                                   unsigned int func, unsigned int off,
 112                                   void *buf, int len)
 113 {
 114         int err = -EINVAL;
 115         u32 addr, val;
 116         void __iomem *mmio;
 117
 118         SSB_WARN_ON(!pc->hostmode);
 119         if (unlikely(len != 1 && len != 2 && len != 4))
 120                 goto out;
 121         addr = get_cfgspace_addr(pc, bus, dev, func, off);
 122         if (unlikely(!addr))
 123                 goto out;
 124         err = -ENOMEM;
 125         mmio = ioremap_nocache(addr, len);
 126         if (!mmio)
 127                 goto out;
 128
 129         if (mips_busprobe32(val, mmio)) {
 130                 val = 0xffffffff;
 131                 goto unmap;
 132         }
 133
 134         val = readl(mmio);
 135         val >>= (8 * (off & 3));
 136
 137         switch (len) {
 138         case 1:
 139                 *((u8 *)buf) = (u8)val;
 140                 break;
 141         case 2:
 142                 *((u16 *)buf) = (u16)val;
 143                 break;
 144         case 4:
 145                 *((u32 *)buf) = (u32)val;
 146                 break;
 147         }
 148         err = 0;
 149 unmap:
 150         iounmap(mmio);
 151 out:
 152         return err;
 153 }
 154
 155 static int ssb_extpci_write_config(struct ssb_pcicore *pc,
 156                                    unsigned int bus, unsigned int dev,
 157                                    unsigned int func, unsigned int off,
 158                                    const void *buf, int len)
 159 {
 160         int err = -EINVAL;
 161         u32 addr, val = 0;
 162         void __iomem *mmio;
 163
 164         SSB_WARN_ON(!pc->hostmode);
 165         if (unlikely(len != 1 && len != 2 && len != 4))
 166                 goto out;
 167         addr = get_cfgspace_addr(pc, bus, dev, func, off);
 168         if (unlikely(!addr))
 169                 goto out;
 170         err = -ENOMEM;
 171         mmio = ioremap_nocache(addr, len);
 172         if (!mmio)
 173                 goto out;
 174
 175         if (mips_busprobe32(val, mmio)) {
 176                 val = 0xffffffff;
 177                 goto unmap;
 178         }
 179
 180         switch (len) {
 181         case 1:
 182                 val = readl(mmio);
 183                 val &= ~(0xFF << (8 * (off & 3)));
 184                 val |= *((const u8 *)buf) << (8 * (off & 3));
 185                 break;
 186         case 2:
 187                 val = readl(mmio);
 188                 val &= ~(0xFFFF << (8 * (off & 3)));
 189                 val |= *((const u16 *)buf) << (8 * (off & 3));
 190                 break;
 191         case 4:
 192                 val = *((const u32 *)buf);
 193                 break;
 194         }
 195         writel(val, mmio);
 196
 197         err = 0;
 198 unmap:
 199         iounmap(mmio);
 200 out:
 201         return err;
 202 }
 203
 204 static int ssb_pcicore_read_config(struct pci_bus *bus, unsigned int devfn,
 205                                    int reg, int size, u32 *val)
 206 {
 207         unsigned long flags;
 208         int err;
 209
 210         spin_lock_irqsave(&cfgspace_lock, flags);
 211         err = ssb_extpci_read_config(extpci_core, bus->number, PCI_SLOT(devfn),
 212                                      PCI_FUNC(devfn), reg, val, size);
 213         spin_unlock_irqrestore(&cfgspace_lock, flags);
 214
 215         return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
 216 }
 217
 218 static int ssb_pcicore_write_config(struct pci_bus *bus, unsigned int devfn,
 219                                     int reg, int size, u32 val)
 220 {
 221         unsigned long flags;
 222         int err;
 223
 224         spin_lock_irqsave(&cfgspace_lock, flags);
 225         err = ssb_extpci_write_config(extpci_core, bus->number, PCI_SLOT(devfn),
 226                                       PCI_FUNC(devfn), reg, &val, size);
 227         spin_unlock_irqrestore(&cfgspace_lock, flags);
 228
 229         return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
 230 }
 231
 232 static struct pci_ops ssb_pcicore_pciops = {
 233         .read   = ssb_pcicore_read_config,
 234         .write  = ssb_pcicore_write_config,
 235 };
 236
 237 static struct resource ssb_pcicore_mem_resource = {
 238         .name   = "SSB PCIcore external memory",
 239         .start  = SSB_PCI_DMA,
 240         .end    = SSB_PCI_DMA + SSB_PCI_DMA_SZ - 1,
 241         .flags  = IORESOURCE_MEM | IORESOURCE_PCI_FIXED,
 242 };
 243
 244 static struct resource ssb_pcicore_io_resource = {
 245         .name   = "SSB PCIcore external I/O",
 246         .start  = 0x100,
 247         .end    = 0x7FF,
 248         .flags  = IORESOURCE_IO | IORESOURCE_PCI_FIXED,
 249 };
 250
 251 static struct pci_controller ssb_pcicore_controller = {
 252         .pci_ops        = &ssb_pcicore_pciops,
 253         .io_resource    = &ssb_pcicore_io_resource,
 254         .mem_resource   = &ssb_pcicore_mem_resource,
 255 };
 256
 257 /* This function is called when doing a pci_enable_device().
 258  * We must first check if the device is a device on the PCI-core bridge. */
 259 int ssb_pcicore_plat_dev_init(struct pci_dev *d)
 260 {
 261         if (d->bus->ops != &ssb_pcicore_pciops) {
 262                 /* This is not a device on the PCI-core bridge. */
 263                 return -ENODEV;
 264         }
 265
 266         ssb_info("PCI: Fixing up device %s\n", pci_name(d));
 267
 268         /* Fix up interrupt lines */
 269         d->irq = ssb_mips_irq(extpci_core->dev) + 2;
 270         pci_write_config_byte(d, PCI_INTERRUPT_LINE, d->irq);
 271
 272         return 0;
 273 }
 274
 275 /* Early PCI fixup for a device on the PCI-core bridge. */
 276 static void ssb_pcicore_fixup_pcibridge(struct pci_dev *dev)
 277 {
 278         u8 lat;
 279
 280         if (dev->bus->ops != &ssb_pcicore_pciops) {
 281                 /* This is not a device on the PCI-core bridge. */
 282                 return;
 283         }
 284         if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) != 0)
 285                 return;
 286
 287         ssb_info("PCI: Fixing up bridge %s\n", pci_name(dev));
 288
 289         /* Enable PCI bridge bus mastering and memory space */
 290         pci_set_master(dev);
 291         if (pcibios_enable_device(dev, ~0) < 0) {
 292                 ssb_err("PCI: SSB bridge enable failed\n");
 293                 return;
 294         }
 295
 296         /* Enable PCI bridge BAR1 prefetch and burst */
 297         pci_write_config_dword(dev, SSB_BAR1_CONTROL, 3);
 298
 299         /* Make sure our latency is high enough to handle the devices behind us */
 300         lat = 168;
 301         ssb_info("PCI: Fixing latency timer of device %s to %u\n",
 302                  pci_name(dev), lat);
 303         pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
 304 }
 305 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_pcicore_fixup_pcibridge);
 306
 307 /* PCI device IRQ mapping. */
 308 int ssb_pcicore_pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 309 {
 310         if (dev->bus->ops != &ssb_pcicore_pciops) {
 311                 /* This is not a device on the PCI-core bridge. */
 312                 return -ENODEV;
 313         }
 314         return ssb_mips_irq(extpci_core->dev) + 2;
 315 }
 316
 317 static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc)
 318 {
 319         u32 val;
 320
 321         if (WARN_ON(extpci_core))
 322                 return;
 323         extpci_core = pc;
 324
 325         ssb_dbg("PCIcore in host mode found\n");
 326         /* Reset devices on the external PCI bus */
 327         val = SSB_PCICORE_CTL_RST_OE;
 328         val |= SSB_PCICORE_CTL_CLK_OE;
 329         pcicore_write32(pc, SSB_PCICORE_CTL, val);
 330         val |= SSB_PCICORE_CTL_CLK; /* Clock on */
 331         pcicore_write32(pc, SSB_PCICORE_CTL, val);
 332         udelay(150); /* Assertion time demanded by the PCI standard */
 333         val |= SSB_PCICORE_CTL_RST; /* Deassert RST# */
 334         pcicore_write32(pc, SSB_PCICORE_CTL, val);
 335         val = SSB_PCICORE_ARBCTL_INTERN;
 336         pcicore_write32(pc, SSB_PCICORE_ARBCTL, val);
 337         udelay(1); /* Assertion time demanded by the PCI standard */
 338
 339         if (pc->dev->bus->has_cardbus_slot) {
 340                 ssb_dbg("CardBus slot detected\n");
 341                 pc->cardbusmode = 1;
 342                 /* GPIO 1 resets the bridge */
 343                 ssb_gpio_out(pc->dev->bus, 1, 1);
 344                 ssb_gpio_outen(pc->dev->bus, 1, 1);
 345                 pcicore_write16(pc, SSB_PCICORE_SPROM(0),
 346                                 pcicore_read16(pc, SSB_PCICORE_SPROM(0))
 347                                 | 0x0400);
 348         }
 349
 350         /* 64MB I/O window */
 351         pcicore_write32(pc, SSB_PCICORE_SBTOPCI0,
 352                         SSB_PCICORE_SBTOPCI_IO);
 353         /* 64MB config space */
 354         pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
 355                         SSB_PCICORE_SBTOPCI_CFG0);
 356         /* 1GB memory window */
 357         pcicore_write32(pc, SSB_PCICORE_SBTOPCI2,
 358                         SSB_PCICORE_SBTOPCI_MEM | SSB_PCI_DMA);
 359
 360         /*
 361          * Accessing PCI config without a proper delay after devices reset (not
 362          * GPIO reset) was causing reboots on WRT300N v1.0 (BCM4704).
 363          * Tested delay 850 us lowered reboot chance to 50-80%, 1000 us fixed it
 364          * completely. Flushing all writes was also tested but with no luck.
 365          * The same problem was reported for WRT350N v1 (BCM4705), so we just
 366          * sleep here unconditionally.
 367          */
 368         usleep_range(1000, 2000);
 369
 370         /* Enable PCI bridge BAR0 prefetch and burst */
 371         val = PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
 372         ssb_extpci_write_config(pc, 0, 0, 0, PCI_COMMAND, &val, 2);
 373         /* Clear error conditions */
 374         val = 0;
 375         ssb_extpci_write_config(pc, 0, 0, 0, PCI_STATUS, &val, 2);
 376
 377         /* Enable PCI interrupts */
 378         pcicore_write32(pc, SSB_PCICORE_IMASK,
 379                         SSB_PCICORE_IMASK_INTA);
 380
 381         /* Ok, ready to run, register it to the system.
 382          * The following needs change, if we want to port hostmode
 383          * to non-MIPS platform. */
 384         ssb_pcicore_controller.io_map_base = (unsigned long)ioremap_nocache(SSB_PCI_MEM, 0x04000000);
 385         set_io_port_base(ssb_pcicore_controller.io_map_base);
 386         /* Give some time to the PCI controller to configure itself with the new
 387          * values. Not waiting at this point causes crashes of the machine. */
 388         mdelay(10);
 389         register_pci_controller(&ssb_pcicore_controller);
 390 }
 391
 392 static int pcicore_is_in_hostmode(struct ssb_pcicore *pc)
 393 {
 394         struct ssb_bus *bus = pc->dev->bus;
 395         u16 chipid_top;
 396         u32 tmp;
 397
 398         chipid_top = (bus->chip_id & 0xFF00);
 399         if (chipid_top != 0x4700 &&
 400             chipid_top != 0x5300)
 401                 return 0;
 402
 403         if (bus->sprom.boardflags_lo & SSB_PCICORE_BFL_NOPCI)
 404                 return 0;
 405
 406         /* The 200-pin BCM4712 package does not bond out PCI. Even when
 407          * PCI is bonded out, some boards may leave the pins floating. */
 408         if (bus->chip_id == 0x4712) {
 409                 if (bus->chip_package == SSB_CHIPPACK_BCM4712S)
 410                         return 0;
 411                 if (bus->chip_package == SSB_CHIPPACK_BCM4712M)
 412                         return 0;
 413         }
 414         if (bus->chip_id == 0x5350)
 415                 return 0;
 416
 417         return !mips_busprobe32(tmp, (bus->mmio + (pc->dev->core_index * SSB_CORE_SIZE)));
 418 }
 419 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
 420
 421 /**************************************************
 422  * Workarounds.
 423  **************************************************/
 424
 425 static void ssb_pcicore_fix_sprom_core_index(struct ssb_pcicore *pc)
 426 {
 427         u16 tmp = pcicore_read16(pc, SSB_PCICORE_SPROM(0));
 428         if (((tmp & 0xF000) >> 12) != pc->dev->core_index) {
 429                 tmp &= ~0xF000;
 430                 tmp |= (pc->dev->core_index << 12);
 431                 pcicore_write16(pc, SSB_PCICORE_SPROM(0), tmp);
 432         }
 433 }
 434
 435 static u8 ssb_pcicore_polarity_workaround(struct ssb_pcicore *pc)
 436 {
 437         return (ssb_pcie_read(pc, 0x204) & 0x10) ? 0xC0 : 0x80;
 438 }
 439
 440 static void ssb_pcicore_serdes_workaround(struct ssb_pcicore *pc)
 441 {
 442         const u8 serdes_pll_device = 0x1D;
 443         const u8 serdes_rx_device = 0x1F;
 444         u16 tmp;
 445
 446         ssb_pcie_mdio_write(pc, serdes_rx_device, 1 /* Control */,
 447                             ssb_pcicore_polarity_workaround(pc));
 448         tmp = ssb_pcie_mdio_read(pc, serdes_pll_device, 1 /* Control */);
 449         if (tmp & 0x4000)
 450                 ssb_pcie_mdio_write(pc, serdes_pll_device, 1, tmp & ~0x4000);
 451 }
 452
 453 static void ssb_pcicore_pci_setup_workarounds(struct ssb_pcicore *pc)
 454 {
 455         struct ssb_device *pdev = pc->dev;
 456         struct ssb_bus *bus = pdev->bus;
 457         u32 tmp;
 458
 459         tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
 460         tmp |= SSB_PCICORE_SBTOPCI_PREF;
 461         tmp |= SSB_PCICORE_SBTOPCI_BURST;
 462         pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
 463
 464         if (pdev->id.revision < 5) {
 465                 tmp = ssb_read32(pdev, SSB_IMCFGLO);
 466                 tmp &= ~SSB_IMCFGLO_SERTO;
 467                 tmp |= 2;
 468                 tmp &= ~SSB_IMCFGLO_REQTO;
 469                 tmp |= 3 << SSB_IMCFGLO_REQTO_SHIFT;
 470                 ssb_write32(pdev, SSB_IMCFGLO, tmp);
 471                 ssb_commit_settings(bus);
 472         } else if (pdev->id.revision >= 11) {
 473                 tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
 474                 tmp |= SSB_PCICORE_SBTOPCI_MRM;
 475                 pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
 476         }
 477 }
 478
 479 static void ssb_pcicore_pcie_setup_workarounds(struct ssb_pcicore *pc)
 480 {
 481         u32 tmp;
 482         u8 rev = pc->dev->id.revision;
 483
 484         if (rev == 0 || rev == 1) {
 485                 /* TLP Workaround register. */
 486                 tmp = ssb_pcie_read(pc, 0x4);
 487                 tmp |= 0x8;
 488                 ssb_pcie_write(pc, 0x4, tmp);
 489         }
 490         if (rev == 1) {
 491                 /* DLLP Link Control register. */
 492                 tmp = ssb_pcie_read(pc, 0x100);
 493                 tmp |= 0x40;
 494                 ssb_pcie_write(pc, 0x100, tmp);
 495         }
 496
 497         if (rev == 0) {
 498                 const u8 serdes_rx_device = 0x1F;
 499
 500                 ssb_pcie_mdio_write(pc, serdes_rx_device,
 501                                         2 /* Timer */, 0x8128);
 502                 ssb_pcie_mdio_write(pc, serdes_rx_device,
 503                                         6 /* CDR */, 0x0100);
 504                 ssb_pcie_mdio_write(pc, serdes_rx_device,
 505                                         7 /* CDR BW */, 0x1466);
 506         } else if (rev == 3 || rev == 4 || rev == 5) {
 507                 /* TODO: DLLP Power Management Threshold */
 508                 ssb_pcicore_serdes_workaround(pc);
 509                 /* TODO: ASPM */
 510         } else if (rev == 7) {
 511                 /* TODO: No PLL down */
 512         }
 513
 514         if (rev >= 6) {
 515                 /* Miscellaneous Configuration Fixup */
 516                 tmp = pcicore_read16(pc, SSB_PCICORE_SPROM(5));
 517                 if (!(tmp & 0x8000))
 518                         pcicore_write16(pc, SSB_PCICORE_SPROM(5),
 519                                         tmp | 0x8000);
 520         }
 521 }
 522
 523 /**************************************************
 524  * Generic and Clientmode operation code.
 525  **************************************************/
 526
 527 static void ssb_pcicore_init_clientmode(struct ssb_pcicore *pc)
 528 {
 529         struct ssb_device *pdev = pc->dev;
 530         struct ssb_bus *bus = pdev->bus;
 531
 532         if (bus->bustype == SSB_BUSTYPE_PCI)
 533                 ssb_pcicore_fix_sprom_core_index(pc);
 534
 535         /* Disable PCI interrupts. */
 536         ssb_write32(pdev, SSB_INTVEC, 0);
 537
 538         /* Additional PCIe always once-executed workarounds */
 539         if (pc->dev->id.coreid == SSB_DEV_PCIE) {
 540                 ssb_pcicore_serdes_workaround(pc);
 541                 /* TODO: ASPM */
 542                 /* TODO: Clock Request Update */
 543         }
 544 }
 545
 546 void ssb_pcicore_init(struct ssb_pcicore *pc)
 547 {
 548         struct ssb_device *dev = pc->dev;
 549
 550         if (!dev)
 551                 return;
 552         if (!ssb_device_is_enabled(dev))
 553                 ssb_device_enable(dev, 0);
 554
 555 #ifdef CONFIG_SSB_PCICORE_HOSTMODE
 556         pc->hostmode = pcicore_is_in_hostmode(pc);
 557         if (pc->hostmode)
 558                 ssb_pcicore_init_hostmode(pc);
 559 #endif /* CONFIG_SSB_PCICORE_HOSTMODE */
 560         if (!pc->hostmode)
 561                 ssb_pcicore_init_clientmode(pc);
 562 }
 563
 564 static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address)
 565 {
 566         pcicore_write32(pc, 0x130, address);
 567         return pcicore_read32(pc, 0x134);
 568 }
 569
 570 static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data)
 571 {
 572         pcicore_write32(pc, 0x130, address);
 573         pcicore_write32(pc, 0x134, data);
 574 }
 575
 576 static void ssb_pcie_mdio_set_phy(struct ssb_pcicore *pc, u8 phy)
 577 {
 578         const u16 mdio_control = 0x128;
 579         const u16 mdio_data = 0x12C;
 580         u32 v;
 581         int i;
 582
 583         v = (1 << 30); /* Start of Transaction */
 584         v |= (1 << 28); /* Write Transaction */
 585         v |= (1 << 17); /* Turnaround */
 586         v |= (0x1F << 18);
 587         v |= (phy << 4);
 588         pcicore_write32(pc, mdio_data, v);
 589
 590         udelay(10);
 591         for (i = 0; i < 200; i++) {
 592                 v = pcicore_read32(pc, mdio_control);
 593                 if (v & 0x100 /* Trans complete */)
 594                         break;
 595                 msleep(1);
 596         }
 597 }
 598
 599 static u16 ssb_pcie_mdio_read(struct ssb_pcicore *pc, u8 device, u8 address)
 600 {
 601         const u16 mdio_control = 0x128;
 602         const u16 mdio_data = 0x12C;
 603         int max_retries = 10;
 604         u16 ret = 0;
 605         u32 v;
 606         int i;
 607
 608         v = 0x80; /* Enable Preamble Sequence */
 609         v |= 0x2; /* MDIO Clock Divisor */
 610         pcicore_write32(pc, mdio_control, v);
 611
 612         if (pc->dev->id.revision >= 10) {
 613                 max_retries = 200;
 614                 ssb_pcie_mdio_set_phy(pc, device);
 615         }
 616
 617         v = (1 << 30); /* Start of Transaction */
 618         v |= (1 << 29); /* Read Transaction */
 619         v |= (1 << 17); /* Turnaround */
 620         if (pc->dev->id.revision < 10)
 621                 v |= (u32)device << 22;
 622         v |= (u32)address << 18;
 623         pcicore_write32(pc, mdio_data, v);
 624         /* Wait for the device to complete the transaction */
 625         udelay(10);
 626         for (i = 0; i < max_retries; i++) {
 627                 v = pcicore_read32(pc, mdio_control);
 628                 if (v & 0x100 /* Trans complete */) {
 629                         udelay(10);
 630                         ret = pcicore_read32(pc, mdio_data);
 631                         break;
 632                 }
 633                 msleep(1);
 634         }
 635         pcicore_write32(pc, mdio_control, 0);
 636         return ret;
 637 }
 638
 639 static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
 640                                 u8 address, u16 data)
 641 {
 642         const u16 mdio_control = 0x128;
 643         const u16 mdio_data = 0x12C;
 644         int max_retries = 10;
 645         u32 v;
 646         int i;
 647
 648         v = 0x80; /* Enable Preamble Sequence */
 649         v |= 0x2; /* MDIO Clock Divisor */
 650         pcicore_write32(pc, mdio_control, v);
 651
 652         if (pc->dev->id.revision >= 10) {
 653                 max_retries = 200;
 654                 ssb_pcie_mdio_set_phy(pc, device);
 655         }
 656
 657         v = (1 << 30); /* Start of Transaction */
 658         v |= (1 << 28); /* Write Transaction */
 659         v |= (1 << 17); /* Turnaround */
 660         if (pc->dev->id.revision < 10)
 661                 v |= (u32)device << 22;
 662         v |= (u32)address << 18;
 663         v |= data;
 664         pcicore_write32(pc, mdio_data, v);
 665         /* Wait for the device to complete the transaction */
 666         udelay(10);
 667         for (i = 0; i < max_retries; i++) {
 668                 v = pcicore_read32(pc, mdio_control);
 669                 if (v & 0x100 /* Trans complete */)
 670                         break;
 671                 msleep(1);
 672         }
 673         pcicore_write32(pc, mdio_control, 0);
 674 }
 675
 676 int ssb_pcicore_dev_irqvecs_enable(struct ssb_pcicore *pc,
 677                                    struct ssb_device *dev)
 678 {
 679         struct ssb_device *pdev = pc->dev;
 680         struct ssb_bus *bus;
 681         int err = 0;
 682         u32 tmp;
 683
 684         if (dev->bus->bustype != SSB_BUSTYPE_PCI) {
 685                 /* This SSB device is not on a PCI host-bus. So the IRQs are
 686                  * not routed through the PCI core.
 687                  * So we must not enable routing through the PCI core. */
 688                 goto out;
 689         }
 690
 691         if (!pdev)
 692                 goto out;
 693         bus = pdev->bus;
 694
 695         might_sleep_if(pdev->id.coreid != SSB_DEV_PCI);
 696
 697         /* Enable interrupts for this device. */
 698         if ((pdev->id.revision >= 6) || (pdev->id.coreid == SSB_DEV_PCIE)) {
 699                 u32 coremask;
 700
 701                 /* Calculate the "coremask" for the device. */
 702                 coremask = (1 << dev->core_index);
 703
 704                 SSB_WARN_ON(bus->bustype != SSB_BUSTYPE_PCI);
 705                 err = pci_read_config_dword(bus->host_pci, SSB_PCI_IRQMASK, &tmp);
 706                 if (err)
 707                         goto out;
 708                 tmp |= coremask << 8;
 709                 err = pci_write_config_dword(bus->host_pci, SSB_PCI_IRQMASK, tmp);
 710                 if (err)
 711                         goto out;
 712         } else {
 713                 u32 intvec;
 714
 715                 intvec = ssb_read32(pdev, SSB_INTVEC);
 716                 tmp = ssb_read32(dev, SSB_TPSFLAG);
 717                 tmp &= SSB_TPSFLAG_BPFLAG;
 718                 intvec |= (1 << tmp);
 719                 ssb_write32(pdev, SSB_INTVEC, intvec);
 720         }
 721
 722         /* Setup PCIcore operation. */
 723         if (pc->setup_done)
 724                 goto out;
 725         if (pdev->id.coreid == SSB_DEV_PCI) {
 726                 ssb_pcicore_pci_setup_workarounds(pc);
 727         } else {
 728                 WARN_ON(pdev->id.coreid != SSB_DEV_PCIE);
 729                 ssb_pcicore_pcie_setup_workarounds(pc);
 730         }
 731         pc->setup_done = 1;
 732 out:
 733         return err;
 734 }
 735 EXPORT_SYMBOL(ssb_pcicore_dev_irqvecs_enable);