arch/ppc64/kernel/pSeries_pci.c

   1 /*
   2  * pSeries_pci.c
   3  *
   4  * Copyright (C) 2001 Dave Engebretsen, IBM Corporation
   5  * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
   6  *
   7  * pSeries specific routines for PCI.
   8  *
   9  * Based on code from pci.c and chrp_pci.c
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/threads.h>
  28 #include <linux/pci.h>
  29 #include <linux/string.h>
  30 #include <linux/init.h>
  31 #include <linux/bootmem.h>
  32
  33 #include <asm/io.h>
  34 #include <asm/pgtable.h>
  35 #include <asm/irq.h>
  36 #include <asm/prom.h>
  37 #include <asm/machdep.h>
  38 #include <asm/pci-bridge.h>
  39 #include <asm/iommu.h>
  40 #include <asm/rtas.h>
  41
  42 #include "mpic.h"
  43 #include "pci.h"
  44
  45 /* RTAS tokens */
  46 static int read_pci_config;
  47 static int write_pci_config;
  48 static int ibm_read_pci_config;
  49 static int ibm_write_pci_config;
  50
  51 static int s7a_workaround;
  52
  53 extern struct mpic *pSeries_mpic;
  54
  55 static int config_access_valid(struct device_node *dn, int where)
  56 {
  57         if (where < 256)
  58                 return 1;
  59         if (where < 4096 && dn->pci_ext_config_space)
  60                 return 1;
  61
  62         return 0;
  63 }
  64
  65 static int rtas_read_config(struct device_node *dn, int where, int size, u32 *val)
  66 {
  67         int returnval = -1;
  68         unsigned long buid, addr;
  69         int ret;
  70
  71         if (!dn)
  72                 return PCIBIOS_DEVICE_NOT_FOUND;
  73         if (!config_access_valid(dn, where))
  74                 return PCIBIOS_BAD_REGISTER_NUMBER;
  75
  76         addr = ((where & 0xf00) << 20) | (dn->busno << 16) |
  77                 (dn->devfn << 8) | (where & 0xff);
  78         buid = dn->phb->buid;
  79         if (buid) {
  80                 ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
  81                                 addr, buid >> 32, buid & 0xffffffff, size);
  82         } else {
  83                 ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
  84         }
  85         *val = returnval;
  86
  87         if (ret)
  88                 return PCIBIOS_DEVICE_NOT_FOUND;
  89
  90         if (returnval == EEH_IO_ERROR_VALUE(size)
  91             && eeh_dn_check_failure (dn, NULL))
  92                 return PCIBIOS_DEVICE_NOT_FOUND;
  93
  94         return PCIBIOS_SUCCESSFUL;
  95 }
  96
  97 static int rtas_pci_read_config(struct pci_bus *bus,
  98                                 unsigned int devfn,
  99                                 int where, int size, u32 *val)
 100 {
 101         struct device_node *busdn, *dn;
 102
 103         if (bus->self)
 104                 busdn = pci_device_to_OF_node(bus->self);
 105         else
 106                 busdn = bus->sysdata;   /* must be a phb */
 107
 108         /* Search only direct children of the bus */
 109         for (dn = busdn->child; dn; dn = dn->sibling)
 110                 if (dn->devfn == devfn)
 111                         return rtas_read_config(dn, where, size, val);
 112         return PCIBIOS_DEVICE_NOT_FOUND;
 113 }
 114
 115 static int rtas_write_config(struct device_node *dn, int where, int size, u32 val)
 116 {
 117         unsigned long buid, addr;
 118         int ret;
 119
 120         if (!dn)
 121                 return PCIBIOS_DEVICE_NOT_FOUND;
 122         if (!config_access_valid(dn, where))
 123                 return PCIBIOS_BAD_REGISTER_NUMBER;
 124
 125         addr = ((where & 0xf00) << 20) | (dn->busno << 16) |
 126                 (dn->devfn << 8) | (where & 0xff);
 127         buid = dn->phb->buid;
 128         if (buid) {
 129                 ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr, buid >> 32, buid & 0xffffffff, size, (ulong) val);
 130         } else {
 131                 ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
 132         }
 133
 134         if (ret)
 135                 return PCIBIOS_DEVICE_NOT_FOUND;
 136
 137         return PCIBIOS_SUCCESSFUL;
 138 }
 139
 140 static int rtas_pci_write_config(struct pci_bus *bus,
 141                                  unsigned int devfn,
 142                                  int where, int size, u32 val)
 143 {
 144         struct device_node *busdn, *dn;
 145
 146         if (bus->self)
 147                 busdn = pci_device_to_OF_node(bus->self);
 148         else
 149                 busdn = bus->sysdata;   /* must be a phb */
 150
 151         /* Search only direct children of the bus */
 152         for (dn = busdn->child; dn; dn = dn->sibling)
 153                 if (dn->devfn == devfn)
 154                         return rtas_write_config(dn, where, size, val);
 155         return PCIBIOS_DEVICE_NOT_FOUND;
 156 }
 157
 158 struct pci_ops rtas_pci_ops = {
 159         rtas_pci_read_config,
 160         rtas_pci_write_config
 161 };
 162
 163 int is_python(struct device_node *dev)
 164 {
 165         char *model = (char *)get_property(dev, "model", NULL);
 166
 167         if (model && strstr(model, "Python"))
 168                 return 1;
 169
 170         return 0;
 171 }
 172
 173 static int get_phb_reg_prop(struct device_node *dev,
 174                             unsigned int addr_size_words,
 175                             struct reg_property64 *reg)
 176 {
 177         unsigned int *ui_ptr = NULL, len;
 178
 179         /* Found a PHB, now figure out where his registers are mapped. */
 180         ui_ptr = (unsigned int *)get_property(dev, "reg", &len);
 181         if (ui_ptr == NULL)
 182                 return 1;
 183
 184         if (addr_size_words == 1) {
 185                 reg->address = ((struct reg_property32 *)ui_ptr)->address;
 186                 reg->size    = ((struct reg_property32 *)ui_ptr)->size;
 187         } else {
 188                 *reg = *((struct reg_property64 *)ui_ptr);
 189         }
 190
 191         return 0;
 192 }
 193
 194 static void python_countermeasures(struct device_node *dev,
 195                                    unsigned int addr_size_words)
 196 {
 197         struct reg_property64 reg_struct;
 198         void __iomem *chip_regs;
 199         volatile u32 val;
 200
 201         if (get_phb_reg_prop(dev, addr_size_words, &reg_struct))
 202                 return;
 203
 204         /* Python's register file is 1 MB in size. */
 205         chip_regs = ioremap(reg_struct.address & ~(0xfffffUL), 0x100000);
 206
 207         /*
 208          * Firmware doesn't always clear this bit which is critical
 209          * for good performance - Anton
 210          */
 211
 212 #define PRG_CL_RESET_VALID 0x00010000
 213
 214         val = in_be32(chip_regs + 0xf6030);
 215         if (val & PRG_CL_RESET_VALID) {
 216                 printk(KERN_INFO "Python workaround: ");
 217                 val &= ~PRG_CL_RESET_VALID;
 218                 out_be32(chip_regs + 0xf6030, val);
 219                 /*
 220                  * We must read it back for changes to
 221                  * take effect
 222                  */
 223                 val = in_be32(chip_regs + 0xf6030);
 224                 printk("reg0: %x\n", val);
 225         }
 226
 227         iounmap(chip_regs);
 228 }
 229
 230 void __init init_pci_config_tokens (void)
 231 {
 232         read_pci_config = rtas_token("read-pci-config");
 233         write_pci_config = rtas_token("write-pci-config");
 234         ibm_read_pci_config = rtas_token("ibm,read-pci-config");
 235         ibm_write_pci_config = rtas_token("ibm,write-pci-config");
 236 }
 237
 238 unsigned long __devinit get_phb_buid (struct device_node *phb)
 239 {
 240         int addr_cells;
 241         unsigned int *buid_vals;
 242         unsigned int len;
 243         unsigned long buid;
 244
 245         if (ibm_read_pci_config == -1) return 0;
 246
 247         /* PHB's will always be children of the root node,
 248          * or so it is promised by the current firmware. */
 249         if (phb->parent == NULL)
 250                 return 0;
 251         if (phb->parent->parent)
 252                 return 0;
 253
 254         buid_vals = (unsigned int *) get_property(phb, "reg", &len);
 255         if (buid_vals == NULL)
 256                 return 0;
 257
 258         addr_cells = prom_n_addr_cells(phb);
 259         if (addr_cells == 1) {
 260                 buid = (unsigned long) buid_vals[0];
 261         } else {
 262                 buid = (((unsigned long)buid_vals[0]) << 32UL) |
 263                         (((unsigned long)buid_vals[1]) & 0xffffffff);
 264         }
 265         return buid;
 266 }
 267
 268 static int phb_set_bus_ranges(struct device_node *dev,
 269                               struct pci_controller *phb)
 270 {
 271         int *bus_range;
 272         unsigned int len;
 273
 274         bus_range = (int *) get_property(dev, "bus-range", &len);
 275         if (bus_range == NULL || len < 2 * sizeof(int)) {
 276                 return 1;
 277         }
 278
 279         phb->first_busno =  bus_range[0];
 280         phb->last_busno  =  bus_range[1];
 281
 282         return 0;
 283 }
 284
 285 static int __devinit setup_phb(struct device_node *dev,
 286                                struct pci_controller *phb,
 287                                unsigned int addr_size_words)
 288 {
 289         pci_setup_pci_controller(phb);
 290
 291         if (is_python(dev))
 292                 python_countermeasures(dev, addr_size_words);
 293
 294         if (phb_set_bus_ranges(dev, phb))
 295                 return 1;
 296
 297         phb->arch_data = dev;
 298         phb->ops = &rtas_pci_ops;
 299         phb->buid = get_phb_buid(dev);
 300
 301         return 0;
 302 }
 303
 304 static void __devinit add_linux_pci_domain(struct device_node *dev,
 305                                            struct pci_controller *phb,
 306                                            struct property *of_prop)
 307 {
 308         memset(of_prop, 0, sizeof(struct property));
 309         of_prop->name = "linux,pci-domain";
 310         of_prop->length = sizeof(phb->global_number);
 311         of_prop->value = (unsigned char *)&of_prop[1];
 312         memcpy(of_prop->value, &phb->global_number, sizeof(phb->global_number));
 313         prom_add_property(dev, of_prop);
 314 }
 315
 316 static struct pci_controller * __init alloc_phb(struct device_node *dev,
 317                                                 unsigned int addr_size_words)
 318 {
 319         struct pci_controller *phb;
 320         struct property *of_prop;
 321
 322         phb = alloc_bootmem(sizeof(struct pci_controller));
 323         if (phb == NULL)
 324                 return NULL;
 325
 326         of_prop = alloc_bootmem(sizeof(struct property) +
 327                                 sizeof(phb->global_number));
 328         if (!of_prop)
 329                 return NULL;
 330
 331         if (setup_phb(dev, phb, addr_size_words))
 332                 return NULL;
 333
 334         add_linux_pci_domain(dev, phb, of_prop);
 335
 336         return phb;
 337 }
 338
 339 static struct pci_controller * __devinit alloc_phb_dynamic(struct device_node *dev, unsigned int addr_size_words)
 340 {
 341         struct pci_controller *phb;
 342
 343         phb = (struct pci_controller *)kmalloc(sizeof(struct pci_controller),
 344                                                GFP_KERNEL);
 345         if (phb == NULL)
 346                 return NULL;
 347
 348         if (setup_phb(dev, phb, addr_size_words))
 349                 return NULL;
 350
 351         phb->is_dynamic = 1;
 352
 353         /* TODO: linux,pci-domain? */
 354
 355         return phb;
 356 }
 357
 358 unsigned long __init find_and_init_phbs(void)
 359 {
 360         struct device_node *node;
 361         struct pci_controller *phb;
 362         unsigned int root_size_cells = 0;
 363         unsigned int index;
 364         unsigned int *opprop = NULL;
 365         struct device_node *root = of_find_node_by_path("/");
 366
 367         if (ppc64_interrupt_controller == IC_OPEN_PIC) {
 368                 opprop = (unsigned int *)get_property(root,
 369                                 "platform-open-pic", NULL);
 370         }
 371
 372         root_size_cells = prom_n_size_cells(root);
 373
 374         index = 0;
 375
 376         for (node = of_get_next_child(root, NULL);
 377              node != NULL;
 378              node = of_get_next_child(root, node)) {
 379                 if (node->type == NULL || strcmp(node->type, "pci") != 0)
 380                         continue;
 381
 382                 phb = alloc_phb(node, root_size_cells);
 383                 if (!phb)
 384                         continue;
 385
 386                 pci_process_bridge_OF_ranges(phb, node);
 387                 pci_setup_phb_io(phb, index == 0);
 388
 389                 if (ppc64_interrupt_controller == IC_OPEN_PIC && pSeries_mpic) {
 390                         int addr = root_size_cells * (index + 2) - 1;
 391                         mpic_assign_isu(pSeries_mpic, index, opprop[addr]);
 392                 }
 393
 394                 index++;
 395         }
 396
 397         of_node_put(root);
 398         pci_devs_phb_init();
 399
 400         /*
 401          * pci_probe_only and pci_assign_all_buses can be set via properties
 402          * in chosen.
 403          */
 404         if (of_chosen) {
 405                 int *prop;
 406
 407                 prop = (int *)get_property(of_chosen, "linux,pci-probe-only",
 408                                            NULL);
 409                 if (prop)
 410                         pci_probe_only = *prop;
 411
 412                 prop = (int *)get_property(of_chosen,
 413                                            "linux,pci-assign-all-buses", NULL);
 414                 if (prop)
 415                         pci_assign_all_buses = *prop;
 416         }
 417
 418         return 0;
 419 }
 420
 421 struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
 422 {
 423         struct device_node *root = of_find_node_by_path("/");
 424         unsigned int root_size_cells = 0;
 425         struct pci_controller *phb;
 426         struct pci_bus *bus;
 427         int primary;
 428
 429         root_size_cells = prom_n_size_cells(root);
 430
 431         primary = list_empty(&hose_list);
 432         phb = alloc_phb_dynamic(dn, root_size_cells);
 433         if (!phb)
 434                 return NULL;
 435
 436         pci_process_bridge_OF_ranges(phb, dn);
 437
 438         pci_setup_phb_io_dynamic(phb, primary);
 439         of_node_put(root);
 440
 441         pci_devs_phb_init_dynamic(phb);
 442         phb->last_busno = 0xff;
 443         bus = pci_scan_bus(phb->first_busno, phb->ops, phb->arch_data);
 444         phb->bus = bus;
 445         phb->last_busno = bus->subordinate;
 446
 447         return phb;
 448 }
 449 EXPORT_SYMBOL(init_phb_dynamic);
 450
 451 #if 0
 452 void pcibios_name_device(struct pci_dev *dev)
 453 {
 454         struct device_node *dn;
 455
 456         /*
 457          * Add IBM loc code (slot) as a prefix to the device names for service
 458          */
 459         dn = pci_device_to_OF_node(dev);
 460         if (dn) {
 461                 char *loc_code = get_property(dn, "ibm,loc-code", 0);
 462                 if (loc_code) {
 463                         int loc_len = strlen(loc_code);
 464                         if (loc_len < sizeof(dev->dev.name)) {
 465                                 memmove(dev->dev.name+loc_len+1, dev->dev.name,
 466                                         sizeof(dev->dev.name)-loc_len-1);
 467                                 memcpy(dev->dev.name, loc_code, loc_len);
 468                                 dev->dev.name[loc_len] = ' ';
 469                                 dev->dev.name[sizeof(dev->dev.name)-1] = '\0';
 470                         }
 471                 }
 472         }
 473 }
 474 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_name_device);
 475 #endif
 476
 477 static void check_s7a(void)
 478 {
 479         struct device_node *root;
 480         char *model;
 481
 482         root = of_find_node_by_path("/");
 483         if (root) {
 484                 model = get_property(root, "model", NULL);
 485                 if (model && !strcmp(model, "IBM,7013-S7A"))
 486                         s7a_workaround = 1;
 487                 of_node_put(root);
 488         }
 489 }
 490
 491 /* RPA-specific bits for removing PHBs */
 492 int pcibios_remove_root_bus(struct pci_controller *phb)
 493 {
 494         struct pci_bus *b = phb->bus;
 495         struct resource *res;
 496         int rc, i;
 497
 498         res = b->resource[0];
 499         if (!res->flags) {
 500                 printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__,
 501                                 b->name);
 502                 return 1;
 503         }
 504
 505         rc = unmap_bus_range(b);
 506         if (rc) {
 507                 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
 508                         __FUNCTION__, b->name);
 509                 return 1;
 510         }
 511
 512         if (release_resource(res)) {
 513                 printk(KERN_ERR "%s: failed to release IO on bus %s\n",
 514                                 __FUNCTION__, b->name);
 515                 return 1;
 516         }
 517
 518         for (i = 1; i < 3; ++i) {
 519                 res = b->resource[i];
 520                 if (!res->flags && i == 0) {
 521                         printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
 522                                 __FUNCTION__, b->name);
 523                         return 1;
 524                 }
 525                 if (res->flags && release_resource(res)) {
 526                         printk(KERN_ERR
 527                                "%s: failed to release IO %d on bus %s\n",
 528                                 __FUNCTION__, i, b->name);
 529                         return 1;
 530                 }
 531         }
 532
 533         list_del(&phb->list_node);
 534         if (phb->is_dynamic)
 535                 kfree(phb);
 536
 537         return 0;
 538 }
 539 EXPORT_SYMBOL(pcibios_remove_root_bus);
 540
 541 static void __init pSeries_request_regions(void)
 542 {
 543         if (!isa_io_base)
 544                 return;
 545
 546         request_region(0x20,0x20,"pic1");
 547         request_region(0xa0,0x20,"pic2");
 548         request_region(0x00,0x20,"dma1");
 549         request_region(0x40,0x20,"timer");
 550         request_region(0x80,0x10,"dma page reg");
 551         request_region(0xc0,0x20,"dma2");
 552 }
 553
 554 void __init pSeries_final_fixup(void)
 555 {
 556         struct pci_dev *dev = NULL;
 557
 558         check_s7a();
 559
 560         for_each_pci_dev(dev) {
 561                 pci_read_irq_line(dev);
 562                 if (s7a_workaround) {
 563                         if (dev->irq > 16) {
 564                                 dev->irq -= 3;
 565                                 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
 566                         }
 567                 }
 568         }
 569
 570         phbs_remap_io();
 571         pSeries_request_regions();
 572
 573         pci_addr_cache_build();
 574 }
 575
 576 /*
 577  * Assume the winbond 82c105 is the IDE controller on a
 578  * p610.  We should probably be more careful in case
 579  * someone tries to plug in a similar adapter.
 580  */
 581 static void fixup_winbond_82c105(struct pci_dev* dev)
 582 {
 583         int i;
 584         unsigned int reg;
 585
 586         if (!(systemcfg->platform & PLATFORM_PSERIES))
 587                 return;
 588
 589         printk("Using INTC for W82c105 IDE controller.\n");
 590         pci_read_config_dword(dev, 0x40, &reg);
 591         /* Enable LEGIRQ to use INTC instead of ISA interrupts */
 592         pci_write_config_dword(dev, 0x40, reg | (1<<11));
 593
 594         for (i = 0; i < DEVICE_COUNT_RESOURCE; ++i) {
 595                 /* zap the 2nd function of the winbond chip */
 596                 if (dev->resource[i].flags & IORESOURCE_IO
 597                     && dev->bus->number == 0 && dev->devfn == 0x81)
 598                         dev->resource[i].flags &= ~IORESOURCE_IO;
 599         }
 600 }
 601 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
 602                          fixup_winbond_82c105);