arch/powerpc/platforms/iseries/pci.c

   1 /*
   2  * Copyright (C) 2001 Allan Trautman, IBM Corporation
   3  * Copyright (C) 2005,2007  Stephen Rothwell, IBM Corp
   4  *
   5  * iSeries specific routines for PCI.
   6  *
   7  * Based on code from pci.c and iSeries_pci.c 32bit
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  22  */
  23
  24 #undef DEBUG
  25
  26 #include <linux/jiffies.h>
  27 #include <linux/kernel.h>
  28 #include <linux/list.h>
  29 #include <linux/string.h>
  30 #include <linux/slab.h>
  31 #include <linux/init.h>
  32 #include <linux/pci.h>
  33 #include <linux/of.h>
  34 #include <linux/ratelimit.h>
  35
  36 #include <asm/types.h>
  37 #include <asm/io.h>
  38 #include <asm/irq.h>
  39 #include <asm/prom.h>
  40 #include <asm/machdep.h>
  41 #include <asm/pci-bridge.h>
  42 #include <asm/iommu.h>
  43 #include <asm/abs_addr.h>
  44 #include <asm/firmware.h>
  45
  46 #include <asm/iseries/hv_types.h>
  47 #include <asm/iseries/hv_call_xm.h>
  48 #include <asm/iseries/mf.h>
  49 #include <asm/iseries/iommu.h>
  50
  51 #include <asm/ppc-pci.h>
  52
  53 #include "irq.h"
  54 #include "pci.h"
  55 #include "call_pci.h"
  56
  57 #define PCI_RETRY_MAX   3
  58 static int limit_pci_retries = 1;       /* Set Retry Error on. */
  59
  60 /*
  61  * Table defines
  62  * Each Entry size is 4 MB * 1024 Entries = 4GB I/O address space.
  63  */
  64 #define IOMM_TABLE_MAX_ENTRIES  1024
  65 #define IOMM_TABLE_ENTRY_SIZE   0x0000000000400000UL
  66 #define BASE_IO_MEMORY          0xE000000000000000UL
  67 #define END_IO_MEMORY           0xEFFFFFFFFFFFFFFFUL
  68
  69 static unsigned long max_io_memory = BASE_IO_MEMORY;
  70 static long current_iomm_table_entry;
  71
  72 /*
  73  * Lookup Tables.
  74  */
  75 static struct device_node *iomm_table[IOMM_TABLE_MAX_ENTRIES];
  76 static u64 ds_addr_table[IOMM_TABLE_MAX_ENTRIES];
  77
  78 static DEFINE_SPINLOCK(iomm_table_lock);
  79
  80 /*
  81  * Generate a Direct Select Address for the Hypervisor
  82  */
  83 static inline u64 iseries_ds_addr(struct device_node *node)
  84 {
  85         struct pci_dn *pdn = PCI_DN(node);
  86         const u32 *sbp = of_get_property(node, "linux,subbus", NULL);
  87
  88         return ((u64)pdn->busno << 48) + ((u64)(sbp ? *sbp : 0) << 40)
  89                         + ((u64)0x10 << 32);
  90 }
  91
  92 /*
  93  * Size of Bus VPD data
  94  */
  95 #define BUS_VPDSIZE      1024
  96
  97 /*
  98  * Bus Vpd Tags
  99  */
 100 #define VPD_END_OF_AREA         0x79
 101 #define VPD_ID_STRING           0x82
 102 #define VPD_VENDOR_AREA         0x84
 103
 104 /*
 105  * Mfg Area Tags
 106  */
 107 #define VPD_FRU_FRAME_ID        0x4649  /* "FI" */
 108 #define VPD_SLOT_MAP_FORMAT     0x4D46  /* "MF" */
 109 #define VPD_SLOT_MAP            0x534D  /* "SM" */
 110
 111 /*
 112  * Structures of the areas
 113  */
 114 struct mfg_vpd_area {
 115         u16     tag;
 116         u8      length;
 117         u8      data1;
 118         u8      data2;
 119 };
 120 #define MFG_ENTRY_SIZE   3
 121
 122 struct slot_map {
 123         u8      agent;
 124         u8      secondary_agent;
 125         u8      phb;
 126         char    card_location[3];
 127         char    parms[8];
 128         char    reserved[2];
 129 };
 130 #define SLOT_ENTRY_SIZE   16
 131
 132 /*
 133  * Parse the Slot Area
 134  */
 135 static void __init iseries_parse_slot_area(struct slot_map *map, int len,
 136                 HvAgentId agent, u8 *phb, char card[4])
 137 {
 138         /*
 139          * Parse Slot label until we find the one requested
 140          */
 141         while (len > 0) {
 142                 if (map->agent == agent) {
 143                         /*
 144                          * If Phb wasn't found, grab the entry first one found.
 145                          */
 146                         if (*phb == 0xff)
 147                                 *phb = map->phb;
 148                         /* Found it, extract the data. */
 149                         if (map->phb == *phb) {
 150                                 memcpy(card, &map->card_location, 3);
 151                                 card[3]  = 0;
 152                                 break;
 153                         }
 154                 }
 155                 /* Point to the next Slot */
 156                 map = (struct slot_map *)((char *)map + SLOT_ENTRY_SIZE);
 157                 len -= SLOT_ENTRY_SIZE;
 158         }
 159 }
 160
 161 /*
 162  * Parse the Mfg Area
 163  */
 164 static void __init iseries_parse_mfg_area(struct mfg_vpd_area *area, int len,
 165                 HvAgentId agent, u8 *phb, u8 *frame, char card[4])
 166 {
 167         u16 slot_map_fmt = 0;
 168
 169         /* Parse Mfg Data */
 170         while (len > 0) {
 171                 int mfg_tag_len = area->length;
 172                 /* Frame ID         (FI 4649020310 ) */
 173                 if (area->tag == VPD_FRU_FRAME_ID)
 174                         *frame = area->data1;
 175                 /* Slot Map Format  (MF 4D46020004 ) */
 176                 else if (area->tag == VPD_SLOT_MAP_FORMAT)
 177                         slot_map_fmt = (area->data1 * 256)
 178                                 + area->data2;
 179                 /* Slot Map         (SM 534D90 */
 180                 else if (area->tag == VPD_SLOT_MAP) {
 181                         struct slot_map *slot_map;
 182
 183                         if (slot_map_fmt == 0x1004)
 184                                 slot_map = (struct slot_map *)((char *)area
 185                                                 + MFG_ENTRY_SIZE + 1);
 186                         else
 187                                 slot_map = (struct slot_map *)((char *)area
 188                                                 + MFG_ENTRY_SIZE);
 189                         iseries_parse_slot_area(slot_map, mfg_tag_len,
 190                                         agent, phb, card);
 191                 }
 192                 /*
 193                  * Point to the next Mfg Area
 194                  * Use defined size, sizeof give wrong answer
 195                  */
 196                 area = (struct mfg_vpd_area *)((char *)area + mfg_tag_len
 197                                 + MFG_ENTRY_SIZE);
 198                 len -= (mfg_tag_len + MFG_ENTRY_SIZE);
 199         }
 200 }
 201
 202 /*
 203  * Look for "BUS".. Data is not Null terminated.
 204  * PHBID of 0xFF indicates PHB was not found in VPD Data.
 205  */
 206 static u8 __init iseries_parse_phbid(u8 *area, int len)
 207 {
 208         while (len > 0) {
 209                 if ((*area == 'B') && (*(area + 1) == 'U')
 210                                 && (*(area + 2) == 'S')) {
 211                         area += 3;
 212                         while (*area == ' ')
 213                                 area++;
 214                         return *area & 0x0F;
 215                 }
 216                 area++;
 217                 len--;
 218         }
 219         return 0xff;
 220 }
 221
 222 /*
 223  * Parse out the VPD Areas
 224  */
 225 static void __init iseries_parse_vpd(u8 *data, int data_len,
 226                 HvAgentId agent, u8 *frame, char card[4])
 227 {
 228         u8 phb = 0xff;
 229
 230         while (data_len > 0) {
 231                 int len;
 232                 u8 tag = *data;
 233
 234                 if (tag == VPD_END_OF_AREA)
 235                         break;
 236                 len = *(data + 1) + (*(data + 2) * 256);
 237                 data += 3;
 238                 data_len -= 3;
 239                 if (tag == VPD_ID_STRING)
 240                         phb = iseries_parse_phbid(data, len);
 241                 else if (tag == VPD_VENDOR_AREA)
 242                         iseries_parse_mfg_area((struct mfg_vpd_area *)data, len,
 243                                         agent, &phb, frame, card);
 244                 /* Point to next Area. */
 245                 data += len;
 246                 data_len -= len;
 247         }
 248 }
 249
 250 static int __init iseries_get_location_code(u16 bus, HvAgentId agent,
 251                 u8 *frame, char card[4])
 252 {
 253         int status = 0;
 254         int bus_vpd_len = 0;
 255         u8 *bus_vpd = kmalloc(BUS_VPDSIZE, GFP_KERNEL);
 256
 257         if (bus_vpd == NULL) {
 258                 printk("PCI: Bus VPD Buffer allocation failure.\n");
 259                 return 0;
 260         }
 261         bus_vpd_len = HvCallPci_getBusVpd(bus, iseries_hv_addr(bus_vpd),
 262                                         BUS_VPDSIZE);
 263         if (bus_vpd_len == 0) {
 264                 printk("PCI: Bus VPD Buffer zero length.\n");
 265                 goto out_free;
 266         }
 267         /* printk("PCI: bus_vpd: %p, %d\n",bus_vpd, bus_vpd_len); */
 268         /* Make sure this is what I think it is */
 269         if (*bus_vpd != VPD_ID_STRING) {
 270                 printk("PCI: Bus VPD Buffer missing starting tag.\n");
 271                 goto out_free;
 272         }
 273         iseries_parse_vpd(bus_vpd, bus_vpd_len, agent, frame, card);
 274         status = 1;
 275 out_free:
 276         kfree(bus_vpd);
 277         return status;
 278 }
 279
 280 /*
 281  * Prints the device information.
 282  * - Pass in pci_dev* pointer to the device.
 283  * - Pass in the device count
 284  *
 285  * Format:
 286  * PCI: Bus  0, Device 26, Vendor 0x12AE  Frame  1, Card  C10  Ethernet
 287  * controller
 288  */
 289 static void __init iseries_device_information(struct pci_dev *pdev,
 290                                               u16 bus, HvSubBusNumber subbus)
 291 {
 292         u8 frame = 0;
 293         char card[4];
 294         HvAgentId agent;
 295
 296         agent = ISERIES_PCI_AGENTID(ISERIES_GET_DEVICE_FROM_SUBBUS(subbus),
 297                         ISERIES_GET_FUNCTION_FROM_SUBBUS(subbus));
 298
 299         if (iseries_get_location_code(bus, agent, &frame, card)) {
 300                 printk(KERN_INFO "PCI: %s, Vendor %04X Frame%3d, "
 301                        "Card %4s  0x%04X\n", pci_name(pdev), pdev->vendor,
 302                        frame, card, (int)(pdev->class >> 8));
 303         }
 304 }
 305
 306 /*
 307  * iomm_table_allocate_entry
 308  *
 309  * Adds pci_dev entry in address translation table
 310  *
 311  * - Allocates the number of entries required in table base on BAR
 312  *   size.
 313  * - Allocates starting at BASE_IO_MEMORY and increases.
 314  * - The size is round up to be a multiple of entry size.
 315  * - CurrentIndex is incremented to keep track of the last entry.
 316  * - Builds the resource entry for allocated BARs.
 317  */
 318 static void __init iomm_table_allocate_entry(struct pci_dev *dev, int bar_num)
 319 {
 320         struct resource *bar_res = &dev->resource[bar_num];
 321         long bar_size = pci_resource_len(dev, bar_num);
 322         struct device_node *dn = pci_device_to_OF_node(dev);
 323
 324         /*
 325          * No space to allocate, quick exit, skip Allocation.
 326          */
 327         if (bar_size == 0)
 328                 return;
 329         /*
 330          * Set Resource values.
 331          */
 332         spin_lock(&iomm_table_lock);
 333         bar_res->start = BASE_IO_MEMORY +
 334                 IOMM_TABLE_ENTRY_SIZE * current_iomm_table_entry;
 335         bar_res->end = bar_res->start + bar_size - 1;
 336         /*
 337          * Allocate the number of table entries needed for BAR.
 338          */
 339         while (bar_size > 0 ) {
 340                 iomm_table[current_iomm_table_entry] = dn;
 341                 ds_addr_table[current_iomm_table_entry] =
 342                         iseries_ds_addr(dn) | (bar_num << 24);
 343                 bar_size -= IOMM_TABLE_ENTRY_SIZE;
 344                 ++current_iomm_table_entry;
 345         }
 346         max_io_memory = BASE_IO_MEMORY +
 347                 IOMM_TABLE_ENTRY_SIZE * current_iomm_table_entry;
 348         spin_unlock(&iomm_table_lock);
 349 }
 350
 351 /*
 352  * allocate_device_bars
 353  *
 354  * - Allocates ALL pci_dev BAR's and updates the resources with the
 355  *   BAR value.  BARS with zero length will have the resources
 356  *   The HvCallPci_getBarParms is used to get the size of the BAR
 357  *   space.  It calls iomm_table_allocate_entry to allocate
 358  *   each entry.
 359  * - Loops through The Bar resources(0 - 5) including the ROM
 360  *   is resource(6).
 361  */
 362 static void __init allocate_device_bars(struct pci_dev *dev)
 363 {
 364         int bar_num;
 365
 366         for (bar_num = 0; bar_num <= PCI_ROM_RESOURCE; ++bar_num)
 367                 iomm_table_allocate_entry(dev, bar_num);
 368 }
 369
 370 /*
 371  * Log error information to system console.
 372  * Filter out the device not there errors.
 373  * PCI: EADs Connect Failed 0x18.58.10 Rc: 0x00xx
 374  * PCI: Read Vendor Failed 0x18.58.10 Rc: 0x00xx
 375  * PCI: Connect Bus Unit Failed 0x18.58.10 Rc: 0x00xx
 376  */
 377 static void pci_log_error(char *error, int bus, int subbus,
 378                 int agent, int hv_res)
 379 {
 380         if (hv_res == 0x0302)
 381                 return;
 382         printk(KERN_ERR "PCI: %s Failed: 0x%02X.%02X.%02X Rc: 0x%04X",
 383                error, bus, subbus, agent, hv_res);
 384 }
 385
 386 /*
 387  * Look down the chain to find the matching Device Device
 388  */
 389 static struct device_node *find_device_node(int bus, int devfn)
 390 {
 391         struct device_node *node;
 392
 393         for (node = NULL; (node = of_find_all_nodes(node)); ) {
 394                 struct pci_dn *pdn = PCI_DN(node);
 395
 396                 if (pdn && (bus == pdn->busno) && (devfn == pdn->devfn))
 397                         return node;
 398         }
 399         return NULL;
 400 }
 401
 402 /*
 403  * iSeries_pcibios_fixup_resources
 404  *
 405  * Fixes up all resources for devices
 406  */
 407 void __init iSeries_pcibios_fixup_resources(struct pci_dev *pdev)
 408 {
 409         const u32 *agent;
 410         const u32 *sub_bus;
 411         unsigned char bus = pdev->bus->number;
 412         struct device_node *node;
 413         int i;
 414
 415         node = pci_device_to_OF_node(pdev);
 416         pr_debug("PCI: iSeries %s, pdev %p, node %p\n",
 417                  pci_name(pdev), pdev, node);
 418         if (!node) {
 419                 printk("PCI: %s disabled, device tree entry not found !\n",
 420                        pci_name(pdev));
 421                 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
 422                         pdev->resource[i].flags = 0;
 423                 return;
 424         }
 425         sub_bus = of_get_property(node, "linux,subbus", NULL);
 426         agent = of_get_property(node, "linux,agent-id", NULL);
 427         if (agent && sub_bus) {
 428                 u8 irq = iSeries_allocate_IRQ(bus, 0, *sub_bus);
 429                 int err;
 430
 431                 err = HvCallXm_connectBusUnit(bus, *sub_bus, *agent, irq);
 432                 if (err)
 433                         pci_log_error("Connect Bus Unit",
 434                                       bus, *sub_bus, *agent, err);
 435                 else {
 436                         err = HvCallPci_configStore8(bus, *sub_bus,
 437                                         *agent, PCI_INTERRUPT_LINE, irq);
 438                         if (err)
 439                                 pci_log_error("PciCfgStore Irq Failed!",
 440                                                 bus, *sub_bus, *agent, err);
 441                         else
 442                                 pdev->irq = irq;
 443                 }
 444         }
 445
 446         allocate_device_bars(pdev);
 447         if (likely(sub_bus))
 448                 iseries_device_information(pdev, bus, *sub_bus);
 449         else
 450                 printk(KERN_ERR "PCI: Device node %s has missing or invalid "
 451                                 "linux,subbus property\n", node->full_name);
 452 }
 453
 454 /*
 455  * iSeries_pci_final_fixup(void)
 456  */
 457 void __init iSeries_pci_final_fixup(void)
 458 {
 459         /* Fix up at the device node and pci_dev relationship */
 460         mf_display_src(0xC9000100);
 461         iSeries_activate_IRQs();
 462         mf_display_src(0xC9000200);
 463 }
 464
 465 /*
 466  * Config space read and write functions.
 467  * For now at least, we look for the device node for the bus and devfn
 468  * that we are asked to access.  It may be possible to translate the devfn
 469  * to a subbus and deviceid more directly.
 470  */
 471 static u64 hv_cfg_read_func[4]  = {
 472         HvCallPciConfigLoad8, HvCallPciConfigLoad16,
 473         HvCallPciConfigLoad32, HvCallPciConfigLoad32
 474 };
 475
 476 static u64 hv_cfg_write_func[4] = {
 477         HvCallPciConfigStore8, HvCallPciConfigStore16,
 478         HvCallPciConfigStore32, HvCallPciConfigStore32
 479 };
 480
 481 /*
 482  * Read PCI config space
 483  */
 484 static int iSeries_pci_read_config(struct pci_bus *bus, unsigned int devfn,
 485                 int offset, int size, u32 *val)
 486 {
 487         struct device_node *node = find_device_node(bus->number, devfn);
 488         u64 fn;
 489         struct HvCallPci_LoadReturn ret;
 490
 491         if (node == NULL)
 492                 return PCIBIOS_DEVICE_NOT_FOUND;
 493         if (offset > 255) {
 494                 *val = ~0;
 495                 return PCIBIOS_BAD_REGISTER_NUMBER;
 496         }
 497
 498         fn = hv_cfg_read_func[(size - 1) & 3];
 499         HvCall3Ret16(fn, &ret, iseries_ds_addr(node), offset, 0);
 500
 501         if (ret.rc != 0) {
 502                 *val = ~0;
 503                 return PCIBIOS_DEVICE_NOT_FOUND;        /* or something */
 504         }
 505
 506         *val = ret.value;
 507         return 0;
 508 }
 509
 510 /*
 511  * Write PCI config space
 512  */
 513
 514 static int iSeries_pci_write_config(struct pci_bus *bus, unsigned int devfn,
 515                 int offset, int size, u32 val)
 516 {
 517         struct device_node *node = find_device_node(bus->number, devfn);
 518         u64 fn;
 519         u64 ret;
 520
 521         if (node == NULL)
 522                 return PCIBIOS_DEVICE_NOT_FOUND;
 523         if (offset > 255)
 524                 return PCIBIOS_BAD_REGISTER_NUMBER;
 525
 526         fn = hv_cfg_write_func[(size - 1) & 3];
 527         ret = HvCall4(fn, iseries_ds_addr(node), offset, val, 0);
 528
 529         if (ret != 0)
 530                 return PCIBIOS_DEVICE_NOT_FOUND;
 531
 532         return 0;
 533 }
 534
 535 static struct pci_ops iSeries_pci_ops = {
 536         .read = iSeries_pci_read_config,
 537         .write = iSeries_pci_write_config
 538 };
 539
 540 /*
 541  * Check Return Code
 542  * -> On Failure, print and log information.
 543  *    Increment Retry Count, if exceeds max, panic partition.
 544  *
 545  * PCI: Device 23.90 ReadL I/O Error( 0): 0x1234
 546  * PCI: Device 23.90 ReadL Retry( 1)
 547  * PCI: Device 23.90 ReadL Retry Successful(1)
 548  */
 549 static int check_return_code(char *type, struct device_node *dn,
 550                 int *retry, u64 ret)
 551 {
 552         if (ret != 0)  {
 553                 struct pci_dn *pdn = PCI_DN(dn);
 554
 555                 (*retry)++;
 556                 printk("PCI: %s: Device 0x%04X:%02X  I/O Error(%2d): 0x%04X\n",
 557                                 type, pdn->busno, pdn->devfn,
 558                                 *retry, (int)ret);
 559                 /*
 560                  * Bump the retry and check for retry count exceeded.
 561                  * If, Exceeded, panic the system.
 562                  */
 563                 if (((*retry) > PCI_RETRY_MAX) &&
 564                                 (limit_pci_retries > 0)) {
 565                         mf_display_src(0xB6000103);
 566                         panic_timeout = 0;
 567                         panic("PCI: Hardware I/O Error, SRC B6000103, "
 568                                         "Automatic Reboot Disabled.\n");
 569                 }
 570                 return -1;      /* Retry Try */
 571         }
 572         return 0;
 573 }
 574
 575 /*
 576  * Translate the I/O Address into a device node, bar, and bar offset.
 577  * Note: Make sure the passed variable end up on the stack to avoid
 578  * the exposure of being device global.
 579  */
 580 static inline struct device_node *xlate_iomm_address(
 581                 const volatile void __iomem *addr,
 582                 u64 *dsaptr, u64 *bar_offset, const char *func)
 583 {
 584         unsigned long orig_addr;
 585         unsigned long base_addr;
 586         unsigned long ind;
 587         struct device_node *dn;
 588
 589         orig_addr = (unsigned long __force)addr;
 590         if ((orig_addr < BASE_IO_MEMORY) || (orig_addr >= max_io_memory)) {
 591                 static DEFINE_RATELIMIT_STATE(ratelimit, 60 * HZ, 10);
 592
 593                 if (__ratelimit(&ratelimit))
 594                         printk(KERN_ERR
 595                                 "iSeries_%s: invalid access at IO address %p\n",
 596                                 func, addr);
 597                 return NULL;
 598         }
 599         base_addr = orig_addr - BASE_IO_MEMORY;
 600         ind = base_addr / IOMM_TABLE_ENTRY_SIZE;
 601         dn = iomm_table[ind];
 602
 603         if (dn != NULL) {
 604                 *dsaptr = ds_addr_table[ind];
 605                 *bar_offset = base_addr % IOMM_TABLE_ENTRY_SIZE;
 606         } else
 607                 panic("PCI: Invalid PCI IO address detected!\n");
 608         return dn;
 609 }
 610
 611 /*
 612  * Read MM I/O Instructions for the iSeries
 613  * On MM I/O error, all ones are returned and iSeries_pci_IoError is cal
 614  * else, data is returned in Big Endian format.
 615  */
 616 static u8 iseries_readb(const volatile void __iomem *addr)
 617 {
 618         u64 bar_offset;
 619         u64 dsa;
 620         int retry = 0;
 621         struct HvCallPci_LoadReturn ret;
 622         struct device_node *dn =
 623                 xlate_iomm_address(addr, &dsa, &bar_offset, "read_byte");
 624
 625         if (dn == NULL)
 626                 return 0xff;
 627         do {
 628                 HvCall3Ret16(HvCallPciBarLoad8, &ret, dsa, bar_offset, 0);
 629         } while (check_return_code("RDB", dn, &retry, ret.rc) != 0);
 630
 631         return ret.value;
 632 }
 633
 634 static u16 iseries_readw_be(const volatile void __iomem *addr)
 635 {
 636         u64 bar_offset;
 637         u64 dsa;
 638         int retry = 0;
 639         struct HvCallPci_LoadReturn ret;
 640         struct device_node *dn =
 641                 xlate_iomm_address(addr, &dsa, &bar_offset, "read_word");
 642
 643         if (dn == NULL)
 644                 return 0xffff;
 645         do {
 646                 HvCall3Ret16(HvCallPciBarLoad16, &ret, dsa,
 647                                 bar_offset, 0);
 648         } while (check_return_code("RDW", dn, &retry, ret.rc) != 0);
 649
 650         return ret.value;
 651 }
 652
 653 static u32 iseries_readl_be(const volatile void __iomem *addr)
 654 {
 655         u64 bar_offset;
 656         u64 dsa;
 657         int retry = 0;
 658         struct HvCallPci_LoadReturn ret;
 659         struct device_node *dn =
 660                 xlate_iomm_address(addr, &dsa, &bar_offset, "read_long");
 661
 662         if (dn == NULL)
 663                 return 0xffffffff;
 664         do {
 665                 HvCall3Ret16(HvCallPciBarLoad32, &ret, dsa,
 666                                 bar_offset, 0);
 667         } while (check_return_code("RDL", dn, &retry, ret.rc) != 0);
 668
 669         return ret.value;
 670 }
 671
 672 /*
 673  * Write MM I/O Instructions for the iSeries
 674  *
 675  */
 676 static void iseries_writeb(u8 data, volatile void __iomem *addr)
 677 {
 678         u64 bar_offset;
 679         u64 dsa;
 680         int retry = 0;
 681         u64 rc;
 682         struct device_node *dn =
 683                 xlate_iomm_address(addr, &dsa, &bar_offset, "write_byte");
 684
 685         if (dn == NULL)
 686                 return;
 687         do {
 688                 rc = HvCall4(HvCallPciBarStore8, dsa, bar_offset, data, 0);
 689         } while (check_return_code("WWB", dn, &retry, rc) != 0);
 690 }
 691
 692 static void iseries_writew_be(u16 data, volatile void __iomem *addr)
 693 {
 694         u64 bar_offset;
 695         u64 dsa;
 696         int retry = 0;
 697         u64 rc;
 698         struct device_node *dn =
 699                 xlate_iomm_address(addr, &dsa, &bar_offset, "write_word");
 700
 701         if (dn == NULL)
 702                 return;
 703         do {
 704                 rc = HvCall4(HvCallPciBarStore16, dsa, bar_offset, data, 0);
 705         } while (check_return_code("WWW", dn, &retry, rc) != 0);
 706 }
 707
 708 static void iseries_writel_be(u32 data, volatile void __iomem *addr)
 709 {
 710         u64 bar_offset;
 711         u64 dsa;
 712         int retry = 0;
 713         u64 rc;
 714         struct device_node *dn =
 715                 xlate_iomm_address(addr, &dsa, &bar_offset, "write_long");
 716
 717         if (dn == NULL)
 718                 return;
 719         do {
 720                 rc = HvCall4(HvCallPciBarStore32, dsa, bar_offset, data, 0);
 721         } while (check_return_code("WWL", dn, &retry, rc) != 0);
 722 }
 723
 724 static u16 iseries_readw(const volatile void __iomem *addr)
 725 {
 726         return le16_to_cpu(iseries_readw_be(addr));
 727 }
 728
 729 static u32 iseries_readl(const volatile void __iomem *addr)
 730 {
 731         return le32_to_cpu(iseries_readl_be(addr));
 732 }
 733
 734 static void iseries_writew(u16 data, volatile void __iomem *addr)
 735 {
 736         iseries_writew_be(cpu_to_le16(data), addr);
 737 }
 738
 739 static void iseries_writel(u32 data, volatile void __iomem *addr)
 740 {
 741         iseries_writel(cpu_to_le32(data), addr);
 742 }
 743
 744 static void iseries_readsb(const volatile void __iomem *addr, void *buf,
 745                            unsigned long count)
 746 {
 747         u8 *dst = buf;
 748         while(count-- > 0)
 749                 *(dst++) = iseries_readb(addr);
 750 }
 751
 752 static void iseries_readsw(const volatile void __iomem *addr, void *buf,
 753                            unsigned long count)
 754 {
 755         u16 *dst = buf;
 756         while(count-- > 0)
 757                 *(dst++) = iseries_readw_be(addr);
 758 }
 759
 760 static void iseries_readsl(const volatile void __iomem *addr, void *buf,
 761                            unsigned long count)
 762 {
 763         u32 *dst = buf;
 764         while(count-- > 0)
 765                 *(dst++) = iseries_readl_be(addr);
 766 }
 767
 768 static void iseries_writesb(volatile void __iomem *addr, const void *buf,
 769                             unsigned long count)
 770 {
 771         const u8 *src = buf;
 772         while(count-- > 0)
 773                 iseries_writeb(*(src++), addr);
 774 }
 775
 776 static void iseries_writesw(volatile void __iomem *addr, const void *buf,
 777                             unsigned long count)
 778 {
 779         const u16 *src = buf;
 780         while(count-- > 0)
 781                 iseries_writew_be(*(src++), addr);
 782 }
 783
 784 static void iseries_writesl(volatile void __iomem *addr, const void *buf,
 785                             unsigned long count)
 786 {
 787         const u32 *src = buf;
 788         while(count-- > 0)
 789                 iseries_writel_be(*(src++), addr);
 790 }
 791
 792 static void iseries_memset_io(volatile void __iomem *addr, int c,
 793                               unsigned long n)
 794 {
 795         volatile char __iomem *d = addr;
 796
 797         while (n-- > 0)
 798                 iseries_writeb(c, d++);
 799 }
 800
 801 static void iseries_memcpy_fromio(void *dest, const volatile void __iomem *src,
 802                                   unsigned long n)
 803 {
 804         char *d = dest;
 805         const volatile char __iomem *s = src;
 806
 807         while (n-- > 0)
 808                 *d++ = iseries_readb(s++);
 809 }
 810
 811 static void iseries_memcpy_toio(volatile void __iomem *dest, const void *src,
 812                                 unsigned long n)
 813 {
 814         const char *s = src;
 815         volatile char __iomem *d = dest;
 816
 817         while (n-- > 0)
 818                 iseries_writeb(*s++, d++);
 819 }
 820
 821 /* We only set MMIO ops. The default PIO ops will be default
 822  * to the MMIO ops + pci_io_base which is 0 on iSeries as
 823  * expected so both should work.
 824  *
 825  * Note that we don't implement the readq/writeq versions as
 826  * I don't know of an HV call for doing so. Thus, the default
 827  * operation will be used instead, which will fault a the value
 828  * return by iSeries for MMIO addresses always hits a non mapped
 829  * area. This is as good as the BUG() we used to have there.
 830  */
 831 static struct ppc_pci_io __initdata iseries_pci_io = {
 832         .readb = iseries_readb,
 833         .readw = iseries_readw,
 834         .readl = iseries_readl,
 835         .readw_be = iseries_readw_be,
 836         .readl_be = iseries_readl_be,
 837         .writeb = iseries_writeb,
 838         .writew = iseries_writew,
 839         .writel = iseries_writel,
 840         .writew_be = iseries_writew_be,
 841         .writel_be = iseries_writel_be,
 842         .readsb = iseries_readsb,
 843         .readsw = iseries_readsw,
 844         .readsl = iseries_readsl,
 845         .writesb = iseries_writesb,
 846         .writesw = iseries_writesw,
 847         .writesl = iseries_writesl,
 848         .memset_io = iseries_memset_io,
 849         .memcpy_fromio = iseries_memcpy_fromio,
 850         .memcpy_toio = iseries_memcpy_toio,
 851 };
 852
 853 /*
 854  * iSeries_pcibios_init
 855  *
 856  * Description:
 857  *   This function checks for all possible system PCI host bridges that connect
 858  *   PCI buses.  The system hypervisor is queried as to the guest partition
 859  *   ownership status.  A pci_controller is built for any bus which is partially
 860  *   owned or fully owned by this guest partition.
 861  */
 862 void __init iSeries_pcibios_init(void)
 863 {
 864         struct pci_controller *phb;
 865         struct device_node *root = of_find_node_by_path("/");
 866         struct device_node *node = NULL;
 867
 868         /* Install IO hooks */
 869         ppc_pci_io = iseries_pci_io;
 870
 871         pci_probe_only = 1;
 872
 873         /* iSeries has no IO space in the common sense, it needs to set
 874          * the IO base to 0
 875          */
 876         pci_io_base = 0;
 877
 878         if (root == NULL) {
 879                 printk(KERN_CRIT "iSeries_pcibios_init: can't find root "
 880                                 "of device tree\n");
 881                 return;
 882         }
 883         while ((node = of_get_next_child(root, node)) != NULL) {
 884                 HvBusNumber bus;
 885                 const u32 *busp;
 886
 887                 if ((node->type == NULL) || (strcmp(node->type, "pci") != 0))
 888                         continue;
 889
 890                 busp = of_get_property(node, "bus-range", NULL);
 891                 if (busp == NULL)
 892                         continue;
 893                 bus = *busp;
 894                 printk("bus %d appears to exist\n", bus);
 895                 phb = pcibios_alloc_controller(node);
 896                 if (phb == NULL)
 897                         continue;
 898                 /* All legacy iSeries PHBs are in domain zero */
 899                 phb->global_number = 0;
 900
 901                 phb->first_busno = bus;
 902                 phb->last_busno = bus;
 903                 phb->ops = &iSeries_pci_ops;
 904                 phb->io_base_virt = (void __iomem *)_IO_BASE;
 905                 phb->io_resource.flags = IORESOURCE_IO;
 906                 phb->io_resource.start = BASE_IO_MEMORY;
 907                 phb->io_resource.end = END_IO_MEMORY;
 908                 phb->io_resource.name = "iSeries PCI IO";
 909                 phb->mem_resources[0].flags = IORESOURCE_MEM;
 910                 phb->mem_resources[0].start = BASE_IO_MEMORY;
 911                 phb->mem_resources[0].end = END_IO_MEMORY;
 912                 phb->mem_resources[0].name = "Series PCI MEM";
 913         }
 914
 915         of_node_put(root);
 916
 917         pci_devs_phb_init();
 918 }
 919