arch/powerpc/platforms/cell/celleb_pci.c

   1 /*
   2  * Support for PCI on Celleb platform.
   3  *
   4  * (C) Copyright 2006-2007 TOSHIBA CORPORATION
   5  *
   6  * This code is based on arch/powerpc/kernel/rtas_pci.c:
   7  *  Copyright (C) 2001 Dave Engebretsen, IBM Corporation
   8  *  Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 #undef DEBUG
  26
  27 #include <linux/kernel.h>
  28 #include <linux/threads.h>
  29 #include <linux/pci.h>
  30 #include <linux/string.h>
  31 #include <linux/init.h>
  32 #include <linux/bootmem.h>
  33 #include <linux/pci_regs.h>
  34 #include <linux/of.h>
  35 #include <linux/of_device.h>
  36 #include <linux/slab.h>
  37
  38 #include <asm/io.h>
  39 #include <asm/irq.h>
  40 #include <asm/prom.h>
  41 #include <asm/pci-bridge.h>
  42 #include <asm/ppc-pci.h>
  43
  44 #include "io-workarounds.h"
  45 #include "celleb_pci.h"
  46
  47 #define MAX_PCI_DEVICES    32
  48 #define MAX_PCI_FUNCTIONS   8
  49 #define MAX_PCI_BASE_ADDRS  3 /* use 64 bit address */
  50
  51 /* definition for fake pci configuration area for GbE, .... ,and etc. */
  52
  53 struct celleb_pci_resource {
  54         struct resource r[MAX_PCI_BASE_ADDRS];
  55 };
  56
  57 struct celleb_pci_private {
  58         unsigned char *fake_config[MAX_PCI_DEVICES][MAX_PCI_FUNCTIONS];
  59         struct celleb_pci_resource *res[MAX_PCI_DEVICES][MAX_PCI_FUNCTIONS];
  60 };
  61
  62 static inline u8 celleb_fake_config_readb(void *addr)
  63 {
  64         u8 *p = addr;
  65         return *p;
  66 }
  67
  68 static inline u16 celleb_fake_config_readw(void *addr)
  69 {
  70         __le16 *p = addr;
  71         return le16_to_cpu(*p);
  72 }
  73
  74 static inline u32 celleb_fake_config_readl(void *addr)
  75 {
  76         __le32 *p = addr;
  77         return le32_to_cpu(*p);
  78 }
  79
  80 static inline void celleb_fake_config_writeb(u32 val, void *addr)
  81 {
  82         u8 *p = addr;
  83         *p = val;
  84 }
  85
  86 static inline void celleb_fake_config_writew(u32 val, void *addr)
  87 {
  88         __le16 val16;
  89         __le16 *p = addr;
  90         val16 = cpu_to_le16(val);
  91         *p = val16;
  92 }
  93
  94 static inline void celleb_fake_config_writel(u32 val, void *addr)
  95 {
  96         __le32 val32;
  97         __le32 *p = addr;
  98         val32 = cpu_to_le32(val);
  99         *p = val32;
 100 }
 101
 102 static unsigned char *get_fake_config_start(struct pci_controller *hose,
 103                                             int devno, int fn)
 104 {
 105         struct celleb_pci_private *private = hose->private_data;
 106
 107         if (private == NULL)
 108                 return NULL;
 109
 110         return private->fake_config[devno][fn];
 111 }
 112
 113 static struct celleb_pci_resource *get_resource_start(
 114                                 struct pci_controller *hose,
 115                                 int devno, int fn)
 116 {
 117         struct celleb_pci_private *private = hose->private_data;
 118
 119         if (private == NULL)
 120                 return NULL;
 121
 122         return private->res[devno][fn];
 123 }
 124
 125
 126 static void celleb_config_read_fake(unsigned char *config, int where,
 127                                     int size, u32 *val)
 128 {
 129         char *p = config + where;
 130
 131         switch (size) {
 132         case 1:
 133                 *val = celleb_fake_config_readb(p);
 134                 break;
 135         case 2:
 136                 *val = celleb_fake_config_readw(p);
 137                 break;
 138         case 4:
 139                 *val = celleb_fake_config_readl(p);
 140                 break;
 141         }
 142 }
 143
 144 static void celleb_config_write_fake(unsigned char *config, int where,
 145                                      int size, u32 val)
 146 {
 147         char *p = config + where;
 148
 149         switch (size) {
 150         case 1:
 151                 celleb_fake_config_writeb(val, p);
 152                 break;
 153         case 2:
 154                 celleb_fake_config_writew(val, p);
 155                 break;
 156         case 4:
 157                 celleb_fake_config_writel(val, p);
 158                 break;
 159         }
 160 }
 161
 162 static int celleb_fake_pci_read_config(struct pci_bus *bus,
 163                 unsigned int devfn, int where, int size, u32 *val)
 164 {
 165         char *config;
 166         struct pci_controller *hose = pci_bus_to_host(bus);
 167         unsigned int devno = devfn >> 3;
 168         unsigned int fn = devfn & 0x7;
 169
 170         /* allignment check */
 171         BUG_ON(where % size);
 172
 173         pr_debug("    fake read: bus=0x%x, ", bus->number);
 174         config = get_fake_config_start(hose, devno, fn);
 175
 176         pr_debug("devno=0x%x, where=0x%x, size=0x%x, ", devno, where, size);
 177         if (!config) {
 178                 pr_debug("failed\n");
 179                 return PCIBIOS_DEVICE_NOT_FOUND;
 180         }
 181
 182         celleb_config_read_fake(config, where, size, val);
 183         pr_debug("val=0x%x\n", *val);
 184
 185         return PCIBIOS_SUCCESSFUL;
 186 }
 187
 188
 189 static int celleb_fake_pci_write_config(struct pci_bus *bus,
 190                 unsigned int devfn, int where, int size, u32 val)
 191 {
 192         char *config;
 193         struct pci_controller *hose = pci_bus_to_host(bus);
 194         struct celleb_pci_resource *res;
 195         unsigned int devno = devfn >> 3;
 196         unsigned int fn = devfn & 0x7;
 197
 198         /* allignment check */
 199         BUG_ON(where % size);
 200
 201         config = get_fake_config_start(hose, devno, fn);
 202
 203         if (!config)
 204                 return PCIBIOS_DEVICE_NOT_FOUND;
 205
 206         if (val == ~0) {
 207                 int i = (where - PCI_BASE_ADDRESS_0) >> 3;
 208
 209                 switch (where) {
 210                 case PCI_BASE_ADDRESS_0:
 211                 case PCI_BASE_ADDRESS_2:
 212                         if (size != 4)
 213                                 return PCIBIOS_DEVICE_NOT_FOUND;
 214                         res = get_resource_start(hose, devno, fn);
 215                         if (!res)
 216                                 return PCIBIOS_DEVICE_NOT_FOUND;
 217                         celleb_config_write_fake(config, where, size,
 218                                         (res->r[i].end - res->r[i].start));
 219                         return PCIBIOS_SUCCESSFUL;
 220                 case PCI_BASE_ADDRESS_1:
 221                 case PCI_BASE_ADDRESS_3:
 222                 case PCI_BASE_ADDRESS_4:
 223                 case PCI_BASE_ADDRESS_5:
 224                         break;
 225                 default:
 226                         break;
 227                 }
 228         }
 229
 230         celleb_config_write_fake(config, where, size, val);
 231         pr_debug("    fake write: where=%x, size=%d, val=%x\n",
 232                  where, size, val);
 233
 234         return PCIBIOS_SUCCESSFUL;
 235 }
 236
 237 static struct pci_ops celleb_fake_pci_ops = {
 238         .read = celleb_fake_pci_read_config,
 239         .write = celleb_fake_pci_write_config,
 240 };
 241
 242 static inline void celleb_setup_pci_base_addrs(struct pci_controller *hose,
 243                                         unsigned int devno, unsigned int fn,
 244                                         unsigned int num_base_addr)
 245 {
 246         u32 val;
 247         unsigned char *config;
 248         struct celleb_pci_resource *res;
 249
 250         config = get_fake_config_start(hose, devno, fn);
 251         res = get_resource_start(hose, devno, fn);
 252
 253         if (!config || !res)
 254                 return;
 255
 256         switch (num_base_addr) {
 257         case 3:
 258                 val = (res->r[2].start & 0xfffffff0)
 259                     | PCI_BASE_ADDRESS_MEM_TYPE_64;
 260                 celleb_config_write_fake(config, PCI_BASE_ADDRESS_4, 4, val);
 261                 val = res->r[2].start >> 32;
 262                 celleb_config_write_fake(config, PCI_BASE_ADDRESS_5, 4, val);
 263                 /* FALLTHROUGH */
 264         case 2:
 265                 val = (res->r[1].start & 0xfffffff0)
 266                     | PCI_BASE_ADDRESS_MEM_TYPE_64;
 267                 celleb_config_write_fake(config, PCI_BASE_ADDRESS_2, 4, val);
 268                 val = res->r[1].start >> 32;
 269                 celleb_config_write_fake(config, PCI_BASE_ADDRESS_3, 4, val);
 270                 /* FALLTHROUGH */
 271         case 1:
 272                 val = (res->r[0].start & 0xfffffff0)
 273                     | PCI_BASE_ADDRESS_MEM_TYPE_64;
 274                 celleb_config_write_fake(config, PCI_BASE_ADDRESS_0, 4, val);
 275                 val = res->r[0].start >> 32;
 276                 celleb_config_write_fake(config, PCI_BASE_ADDRESS_1, 4, val);
 277                 break;
 278         }
 279
 280         val = PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
 281         celleb_config_write_fake(config, PCI_COMMAND, 2, val);
 282 }
 283
 284 static int __init celleb_setup_fake_pci_device(struct device_node *node,
 285                                                struct pci_controller *hose)
 286 {
 287         unsigned int rlen;
 288         int num_base_addr = 0;
 289         u32 val;
 290         const u32 *wi0, *wi1, *wi2, *wi3, *wi4;
 291         unsigned int devno, fn;
 292         struct celleb_pci_private *private = hose->private_data;
 293         unsigned char **config = NULL;
 294         struct celleb_pci_resource **res = NULL;
 295         const char *name;
 296         const unsigned long *li;
 297         int size, result;
 298
 299         if (private == NULL) {
 300                 printk(KERN_ERR "PCI: "
 301                        "memory space for pci controller is not assigned\n");
 302                 goto error;
 303         }
 304
 305         name = of_get_property(node, "model", &rlen);
 306         if (!name) {
 307                 printk(KERN_ERR "PCI: model property not found.\n");
 308                 goto error;
 309         }
 310
 311         wi4 = of_get_property(node, "reg", &rlen);
 312         if (wi4 == NULL)
 313                 goto error;
 314
 315         devno = ((wi4[0] >> 8) & 0xff) >> 3;
 316         fn = (wi4[0] >> 8) & 0x7;
 317
 318         pr_debug("PCI: celleb_setup_fake_pci() %s devno=%x fn=%x\n", name,
 319                  devno, fn);
 320
 321         size = 256;
 322         config = &private->fake_config[devno][fn];
 323         *config = alloc_maybe_bootmem(size, GFP_KERNEL);
 324         if (*config == NULL) {
 325                 printk(KERN_ERR "PCI: "
 326                        "not enough memory for fake configuration space\n");
 327                 goto error;
 328         }
 329         pr_debug("PCI: fake config area assigned 0x%016lx\n",
 330                  (unsigned long)*config);
 331
 332         size = sizeof(struct celleb_pci_resource);
 333         res = &private->res[devno][fn];
 334         *res = alloc_maybe_bootmem(size, GFP_KERNEL);
 335         if (*res == NULL) {
 336                 printk(KERN_ERR
 337                        "PCI: not enough memory for resource data space\n");
 338                 goto error;
 339         }
 340         pr_debug("PCI: res assigned 0x%016lx\n", (unsigned long)*res);
 341
 342         wi0 = of_get_property(node, "device-id", NULL);
 343         wi1 = of_get_property(node, "vendor-id", NULL);
 344         wi2 = of_get_property(node, "class-code", NULL);
 345         wi3 = of_get_property(node, "revision-id", NULL);
 346         if (!wi0 || !wi1 || !wi2 || !wi3) {
 347                 printk(KERN_ERR "PCI: Missing device tree properties.\n");
 348                 goto error;
 349         }
 350
 351         celleb_config_write_fake(*config, PCI_DEVICE_ID, 2, wi0[0] & 0xffff);
 352         celleb_config_write_fake(*config, PCI_VENDOR_ID, 2, wi1[0] & 0xffff);
 353         pr_debug("class-code = 0x%08x\n", wi2[0]);
 354
 355         celleb_config_write_fake(*config, PCI_CLASS_PROG, 1, wi2[0] & 0xff);
 356         celleb_config_write_fake(*config, PCI_CLASS_DEVICE, 2,
 357                                  (wi2[0] >> 8) & 0xffff);
 358         celleb_config_write_fake(*config, PCI_REVISION_ID, 1, wi3[0]);
 359
 360         while (num_base_addr < MAX_PCI_BASE_ADDRS) {
 361                 result = of_address_to_resource(node,
 362                                 num_base_addr, &(*res)->r[num_base_addr]);
 363                 if (result)
 364                         break;
 365                 num_base_addr++;
 366         }
 367
 368         celleb_setup_pci_base_addrs(hose, devno, fn, num_base_addr);
 369
 370         li = of_get_property(node, "interrupts", &rlen);
 371         if (!li) {
 372                 printk(KERN_ERR "PCI: interrupts not found.\n");
 373                 goto error;
 374         }
 375         val = li[0];
 376         celleb_config_write_fake(*config, PCI_INTERRUPT_PIN, 1, 1);
 377         celleb_config_write_fake(*config, PCI_INTERRUPT_LINE, 1, val);
 378
 379 #ifdef DEBUG
 380         pr_debug("PCI: %s irq=%ld\n", name, li[0]);
 381         for (i = 0; i < 6; i++) {
 382                 celleb_config_read_fake(*config,
 383                                         PCI_BASE_ADDRESS_0 + 0x4 * i, 4,
 384                                         &val);
 385                 pr_debug("PCI: %s fn=%d base_address_%d=0x%x\n",
 386                          name, fn, i, val);
 387         }
 388 #endif
 389
 390         celleb_config_write_fake(*config, PCI_HEADER_TYPE, 1,
 391                                  PCI_HEADER_TYPE_NORMAL);
 392
 393         return 0;
 394
 395 error:
 396         if (mem_init_done) {
 397                 if (config && *config)
 398                         kfree(*config);
 399                 if (res && *res)
 400                         kfree(*res);
 401
 402         } else {
 403                 if (config && *config) {
 404                         size = 256;
 405                         free_bootmem((unsigned long)(*config), size);
 406                 }
 407                 if (res && *res) {
 408                         size = sizeof(struct celleb_pci_resource);
 409                         free_bootmem((unsigned long)(*res), size);
 410                 }
 411         }
 412
 413         return 1;
 414 }
 415
 416 static int __init phb_set_bus_ranges(struct device_node *dev,
 417                                      struct pci_controller *phb)
 418 {
 419         const int *bus_range;
 420         unsigned int len;
 421
 422         bus_range = of_get_property(dev, "bus-range", &len);
 423         if (bus_range == NULL || len < 2 * sizeof(int))
 424                 return 1;
 425
 426         phb->first_busno = bus_range[0];
 427         phb->last_busno = bus_range[1];
 428
 429         return 0;
 430 }
 431
 432 static void __init celleb_alloc_private_mem(struct pci_controller *hose)
 433 {
 434         hose->private_data =
 435                 alloc_maybe_bootmem(sizeof(struct celleb_pci_private),
 436                         GFP_KERNEL);
 437 }
 438
 439 static int __init celleb_setup_fake_pci(struct device_node *dev,
 440                                         struct pci_controller *phb)
 441 {
 442         struct device_node *node;
 443
 444         phb->ops = &celleb_fake_pci_ops;
 445         celleb_alloc_private_mem(phb);
 446
 447         for (node = of_get_next_child(dev, NULL);
 448              node != NULL; node = of_get_next_child(dev, node))
 449                 celleb_setup_fake_pci_device(node, phb);
 450
 451         return 0;
 452 }
 453
 454 static struct celleb_phb_spec celleb_fake_pci_spec __initdata = {
 455         .setup = celleb_setup_fake_pci,
 456 };
 457
 458 static struct of_device_id celleb_phb_match[] __initdata = {
 459         {
 460                 .name = "pci-pseudo",
 461                 .data = &celleb_fake_pci_spec,
 462         }, {
 463                 .name = "epci",
 464                 .data = &celleb_epci_spec,
 465         }, {
 466                 .name = "pcie",
 467                 .data = &celleb_pciex_spec,
 468         }, {
 469         },
 470 };
 471
 472 static int __init celleb_io_workaround_init(struct pci_controller *phb,
 473                                             struct celleb_phb_spec *phb_spec)
 474 {
 475         if (phb_spec->ops) {
 476                 iowa_register_bus(phb, phb_spec->ops, phb_spec->iowa_init,
 477                                   phb_spec->iowa_data);
 478                 io_workaround_init();
 479         }
 480
 481         return 0;
 482 }
 483
 484 int __init celleb_setup_phb(struct pci_controller *phb)
 485 {
 486         struct device_node *dev = phb->dn;
 487         const struct of_device_id *match;
 488         struct celleb_phb_spec *phb_spec;
 489         int rc;
 490
 491         match = of_match_node(celleb_phb_match, dev);
 492         if (!match)
 493                 return 1;
 494
 495         phb_set_bus_ranges(dev, phb);
 496         phb->buid = 1;
 497
 498         phb_spec = match->data;
 499         rc = (*phb_spec->setup)(dev, phb);
 500         if (rc)
 501                 return 1;
 502
 503         return celleb_io_workaround_init(phb, phb_spec);
 504 }
 505
 506 int celleb_pci_probe_mode(struct pci_bus *bus)
 507 {
 508         return PCI_PROBE_DEVTREE;
 509 }