arch/ppc64/kernel/rtas_pci.c

   1 /*
   2  * arch/ppc64/kernel/rtas_pci.c
   3  *
   4  * Copyright (C) 2001 Dave Engebretsen, IBM Corporation
   5  * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
   6  *
   7  * RTAS specific routines for PCI.
   8  *
   9  * Based on code from pci.c, chrp_pci.c and pSeries_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 config_access_valid(struct pci_dn *dn, int where)
  52 {
  53         if (where < 256)
  54                 return 1;
  55         if (where < 4096 && dn->pci_ext_config_space)
  56                 return 1;
  57
  58         return 0;
  59 }
  60
  61 static int of_device_available(struct device_node * dn)
  62 {
  63         char * status;
  64
  65         status = get_property(dn, "status", NULL);
  66
  67         if (!status)
  68                 return 1;
  69
  70         if (!strcmp(status, "okay"))
  71                 return 1;
  72
  73         return 0;
  74 }
  75
  76 static int rtas_read_config(struct device_node *dn, int where, int size, u32 *val)
  77 {
  78         int returnval = -1;
  79         unsigned long buid, addr;
  80         int ret;
  81         struct pci_dn *pdn;
  82
  83         if (!dn || !dn->data)
  84                 return PCIBIOS_DEVICE_NOT_FOUND;
  85         pdn = dn->data;
  86         if (!config_access_valid(pdn, where))
  87                 return PCIBIOS_BAD_REGISTER_NUMBER;
  88
  89         addr = ((where & 0xf00) << 20) | (pdn->busno << 16) |
  90                 (pdn->devfn << 8) | (where & 0xff);
  91         buid = pdn->phb->buid;
  92         if (buid) {
  93                 ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
  94                                 addr, buid >> 32, buid & 0xffffffff, size);
  95         } else {
  96                 ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
  97         }
  98         *val = returnval;
  99
 100         if (ret)
 101                 return PCIBIOS_DEVICE_NOT_FOUND;
 102
 103         if (returnval == EEH_IO_ERROR_VALUE(size) &&
 104             eeh_dn_check_failure (dn, NULL))
 105                 return PCIBIOS_DEVICE_NOT_FOUND;
 106
 107         return PCIBIOS_SUCCESSFUL;
 108 }
 109
 110 static int rtas_pci_read_config(struct pci_bus *bus,
 111                                 unsigned int devfn,
 112                                 int where, int size, u32 *val)
 113 {
 114         struct device_node *busdn, *dn;
 115
 116         if (bus->self)
 117                 busdn = pci_device_to_OF_node(bus->self);
 118         else
 119                 busdn = bus->sysdata;   /* must be a phb */
 120
 121         /* Search only direct children of the bus */
 122         for (dn = busdn->child; dn; dn = dn->sibling)
 123                 if (dn->data && PCI_DN(dn)->devfn == devfn
 124                     && of_device_available(dn))
 125                         return rtas_read_config(dn, where, size, val);
 126
 127         return PCIBIOS_DEVICE_NOT_FOUND;
 128 }
 129
 130 int rtas_write_config(struct device_node *dn, int where, int size, u32 val)
 131 {
 132         unsigned long buid, addr;
 133         int ret;
 134         struct pci_dn *pdn;
 135
 136         if (!dn || !dn->data)
 137                 return PCIBIOS_DEVICE_NOT_FOUND;
 138         pdn = dn->data;
 139         if (!config_access_valid(pdn, where))
 140                 return PCIBIOS_BAD_REGISTER_NUMBER;
 141
 142         addr = ((where & 0xf00) << 20) | (pdn->busno << 16) |
 143                 (pdn->devfn << 8) | (where & 0xff);
 144         buid = pdn->phb->buid;
 145         if (buid) {
 146                 ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr, buid >> 32, buid & 0xffffffff, size, (ulong) val);
 147         } else {
 148                 ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
 149         }
 150
 151         if (ret)
 152                 return PCIBIOS_DEVICE_NOT_FOUND;
 153
 154         return PCIBIOS_SUCCESSFUL;
 155 }
 156
 157 static int rtas_pci_write_config(struct pci_bus *bus,
 158                                  unsigned int devfn,
 159                                  int where, int size, u32 val)
 160 {
 161         struct device_node *busdn, *dn;
 162
 163         if (bus->self)
 164                 busdn = pci_device_to_OF_node(bus->self);
 165         else
 166                 busdn = bus->sysdata;   /* must be a phb */
 167
 168         /* Search only direct children of the bus */
 169         for (dn = busdn->child; dn; dn = dn->sibling)
 170                 if (dn->data && PCI_DN(dn)->devfn == devfn
 171                     && of_device_available(dn))
 172                         return rtas_write_config(dn, where, size, val);
 173         return PCIBIOS_DEVICE_NOT_FOUND;
 174 }
 175
 176 struct pci_ops rtas_pci_ops = {
 177         rtas_pci_read_config,
 178         rtas_pci_write_config
 179 };
 180
 181 int is_python(struct device_node *dev)
 182 {
 183         char *model = (char *)get_property(dev, "model", NULL);
 184
 185         if (model && strstr(model, "Python"))
 186                 return 1;
 187
 188         return 0;
 189 }
 190
 191 static int get_phb_reg_prop(struct device_node *dev,
 192                             unsigned int addr_size_words,
 193                             struct reg_property64 *reg)
 194 {
 195         unsigned int *ui_ptr = NULL, len;
 196
 197         /* Found a PHB, now figure out where his registers are mapped. */
 198         ui_ptr = (unsigned int *)get_property(dev, "reg", &len);
 199         if (ui_ptr == NULL)
 200                 return 1;
 201
 202         if (addr_size_words == 1) {
 203                 reg->address = ((struct reg_property32 *)ui_ptr)->address;
 204                 reg->size    = ((struct reg_property32 *)ui_ptr)->size;
 205         } else {
 206                 *reg = *((struct reg_property64 *)ui_ptr);
 207         }
 208
 209         return 0;
 210 }
 211
 212 static void python_countermeasures(struct device_node *dev,
 213                                    unsigned int addr_size_words)
 214 {
 215         struct reg_property64 reg_struct;
 216         void __iomem *chip_regs;
 217         volatile u32 val;
 218
 219         if (get_phb_reg_prop(dev, addr_size_words, &reg_struct))
 220                 return;
 221
 222         /* Python's register file is 1 MB in size. */
 223         chip_regs = ioremap(reg_struct.address & ~(0xfffffUL), 0x100000);
 224
 225         /*
 226          * Firmware doesn't always clear this bit which is critical
 227          * for good performance - Anton
 228          */
 229
 230 #define PRG_CL_RESET_VALID 0x00010000
 231
 232         val = in_be32(chip_regs + 0xf6030);
 233         if (val & PRG_CL_RESET_VALID) {
 234                 printk(KERN_INFO "Python workaround: ");
 235                 val &= ~PRG_CL_RESET_VALID;
 236                 out_be32(chip_regs + 0xf6030, val);
 237                 /*
 238                  * We must read it back for changes to
 239                  * take effect
 240                  */
 241                 val = in_be32(chip_regs + 0xf6030);
 242                 printk("reg0: %x\n", val);
 243         }
 244
 245         iounmap(chip_regs);
 246 }
 247
 248 void __init init_pci_config_tokens (void)
 249 {
 250         read_pci_config = rtas_token("read-pci-config");
 251         write_pci_config = rtas_token("write-pci-config");
 252         ibm_read_pci_config = rtas_token("ibm,read-pci-config");
 253         ibm_write_pci_config = rtas_token("ibm,write-pci-config");
 254 }
 255
 256 unsigned long __devinit get_phb_buid (struct device_node *phb)
 257 {
 258         int addr_cells;
 259         unsigned int *buid_vals;
 260         unsigned int len;
 261         unsigned long buid;
 262
 263         if (ibm_read_pci_config == -1) return 0;
 264
 265         /* PHB's will always be children of the root node,
 266          * or so it is promised by the current firmware. */
 267         if (phb->parent == NULL)
 268                 return 0;
 269         if (phb->parent->parent)
 270                 return 0;
 271
 272         buid_vals = (unsigned int *) get_property(phb, "reg", &len);
 273         if (buid_vals == NULL)
 274                 return 0;
 275
 276         addr_cells = prom_n_addr_cells(phb);
 277         if (addr_cells == 1) {
 278                 buid = (unsigned long) buid_vals[0];
 279         } else {
 280                 buid = (((unsigned long)buid_vals[0]) << 32UL) |
 281                         (((unsigned long)buid_vals[1]) & 0xffffffff);
 282         }
 283         return buid;
 284 }
 285
 286 static int phb_set_bus_ranges(struct device_node *dev,
 287                               struct pci_controller *phb)
 288 {
 289         int *bus_range;
 290         unsigned int len;
 291
 292         bus_range = (int *) get_property(dev, "bus-range", &len);
 293         if (bus_range == NULL || len < 2 * sizeof(int)) {
 294                 return 1;
 295         }
 296
 297         phb->first_busno =  bus_range[0];
 298         phb->last_busno  =  bus_range[1];
 299
 300         return 0;
 301 }
 302
 303 static int __devinit setup_phb(struct device_node *dev,
 304                                struct pci_controller *phb,
 305                                unsigned int addr_size_words)
 306 {
 307         pci_setup_pci_controller(phb);
 308
 309         if (is_python(dev))
 310                 python_countermeasures(dev, addr_size_words);
 311
 312         if (phb_set_bus_ranges(dev, phb))
 313                 return 1;
 314
 315         phb->arch_data = dev;
 316         phb->ops = &rtas_pci_ops;
 317         phb->buid = get_phb_buid(dev);
 318
 319         return 0;
 320 }
 321
 322 static void __devinit add_linux_pci_domain(struct device_node *dev,
 323                                            struct pci_controller *phb,
 324                                            struct property *of_prop)
 325 {
 326         memset(of_prop, 0, sizeof(struct property));
 327         of_prop->name = "linux,pci-domain";
 328         of_prop->length = sizeof(phb->global_number);
 329         of_prop->value = (unsigned char *)&of_prop[1];
 330         memcpy(of_prop->value, &phb->global_number, sizeof(phb->global_number));
 331         prom_add_property(dev, of_prop);
 332 }
 333
 334 static struct pci_controller * __init alloc_phb(struct device_node *dev,
 335                                                 unsigned int addr_size_words)
 336 {
 337         struct pci_controller *phb;
 338         struct property *of_prop;
 339
 340         phb = alloc_bootmem(sizeof(struct pci_controller));
 341         if (phb == NULL)
 342                 return NULL;
 343
 344         of_prop = alloc_bootmem(sizeof(struct property) +
 345                                 sizeof(phb->global_number));
 346         if (!of_prop)
 347                 return NULL;
 348
 349         if (setup_phb(dev, phb, addr_size_words))
 350                 return NULL;
 351
 352         add_linux_pci_domain(dev, phb, of_prop);
 353
 354         return phb;
 355 }
 356
 357 static struct pci_controller * __devinit alloc_phb_dynamic(struct device_node *dev, unsigned int addr_size_words)
 358 {
 359         struct pci_controller *phb;
 360
 361         phb = (struct pci_controller *)kmalloc(sizeof(struct pci_controller),
 362                                                GFP_KERNEL);
 363         if (phb == NULL)
 364                 return NULL;
 365
 366         if (setup_phb(dev, phb, addr_size_words))
 367                 return NULL;
 368
 369         phb->is_dynamic = 1;
 370
 371         /* TODO: linux,pci-domain? */
 372
 373         return phb;
 374 }
 375
 376 unsigned long __init find_and_init_phbs(void)
 377 {
 378         struct device_node *node;
 379         struct pci_controller *phb;
 380         unsigned int root_size_cells = 0;
 381         unsigned int index;
 382         unsigned int *opprop = NULL;
 383         struct device_node *root = of_find_node_by_path("/");
 384
 385         if (ppc64_interrupt_controller == IC_OPEN_PIC) {
 386                 opprop = (unsigned int *)get_property(root,
 387                                 "platform-open-pic", NULL);
 388         }
 389
 390         root_size_cells = prom_n_size_cells(root);
 391
 392         index = 0;
 393
 394         for (node = of_get_next_child(root, NULL);
 395              node != NULL;
 396              node = of_get_next_child(root, node)) {
 397                 if (node->type == NULL || strcmp(node->type, "pci") != 0)
 398                         continue;
 399
 400                 phb = alloc_phb(node, root_size_cells);
 401                 if (!phb)
 402                         continue;
 403
 404                 pci_process_bridge_OF_ranges(phb, node);
 405                 pci_setup_phb_io(phb, index == 0);
 406 #ifdef CONFIG_PPC_PSERIES
 407                 if (ppc64_interrupt_controller == IC_OPEN_PIC && pSeries_mpic) {
 408                         int addr = root_size_cells * (index + 2) - 1;
 409                         mpic_assign_isu(pSeries_mpic, index, opprop[addr]);
 410                 }
 411 #endif
 412                 index++;
 413         }
 414
 415         of_node_put(root);
 416         pci_devs_phb_init();
 417
 418         /*
 419          * pci_probe_only and pci_assign_all_buses can be set via properties
 420          * in chosen.
 421          */
 422         if (of_chosen) {
 423                 int *prop;
 424
 425                 prop = (int *)get_property(of_chosen, "linux,pci-probe-only",
 426                                            NULL);
 427                 if (prop)
 428                         pci_probe_only = *prop;
 429
 430                 prop = (int *)get_property(of_chosen,
 431                                            "linux,pci-assign-all-buses", NULL);
 432                 if (prop)
 433                         pci_assign_all_buses = *prop;
 434         }
 435
 436         return 0;
 437 }
 438
 439 struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
 440 {
 441         struct device_node *root = of_find_node_by_path("/");
 442         unsigned int root_size_cells = 0;
 443         struct pci_controller *phb;
 444         struct pci_bus *bus;
 445         int primary;
 446
 447         root_size_cells = prom_n_size_cells(root);
 448
 449         primary = list_empty(&hose_list);
 450         phb = alloc_phb_dynamic(dn, root_size_cells);
 451         if (!phb)
 452                 return NULL;
 453
 454         pci_process_bridge_OF_ranges(phb, dn);
 455
 456         pci_setup_phb_io_dynamic(phb, primary);
 457         of_node_put(root);
 458
 459         pci_devs_phb_init_dynamic(phb);
 460         phb->last_busno = 0xff;
 461         bus = pci_scan_bus(phb->first_busno, phb->ops, phb->arch_data);
 462         phb->bus = bus;
 463         phb->last_busno = bus->subordinate;
 464
 465         return phb;
 466 }
 467 EXPORT_SYMBOL(init_phb_dynamic);
 468
 469 /* RPA-specific bits for removing PHBs */
 470 int pcibios_remove_root_bus(struct pci_controller *phb)
 471 {
 472         struct pci_bus *b = phb->bus;
 473         struct resource *res;
 474         int rc, i;
 475
 476         res = b->resource[0];
 477         if (!res->flags) {
 478                 printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__,
 479                                 b->name);
 480                 return 1;
 481         }
 482
 483         rc = unmap_bus_range(b);
 484         if (rc) {
 485                 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
 486                         __FUNCTION__, b->name);
 487                 return 1;
 488         }
 489
 490         if (release_resource(res)) {
 491                 printk(KERN_ERR "%s: failed to release IO on bus %s\n",
 492                                 __FUNCTION__, b->name);
 493                 return 1;
 494         }
 495
 496         for (i = 1; i < 3; ++i) {
 497                 res = b->resource[i];
 498                 if (!res->flags && i == 0) {
 499                         printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
 500                                 __FUNCTION__, b->name);
 501                         return 1;
 502                 }
 503                 if (res->flags && release_resource(res)) {
 504                         printk(KERN_ERR
 505                                "%s: failed to release IO %d on bus %s\n",
 506                                 __FUNCTION__, i, b->name);
 507                         return 1;
 508                 }
 509         }
 510
 511         list_del(&phb->list_node);
 512         if (phb->is_dynamic)
 513                 kfree(phb);
 514
 515         return 0;
 516 }
 517 EXPORT_SYMBOL(pcibios_remove_root_bus);