arch/frv/mb93090-mb00/pci-vdk.c

   1 /* pci-vdk.c: MB93090-MB00 (VDK) PCI support
   2  *
   3  * Copyright (C) 2003, 2004 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/types.h>
  13 #include <linux/kernel.h>
  14 #include <linux/sched.h>
  15 #include <linux/pci.h>
  16 #include <linux/init.h>
  17 #include <linux/ioport.h>
  18 #include <linux/delay.h>
  19 #include <linux/slab.h>
  20
  21 #include <asm/segment.h>
  22 #include <asm/io.h>
  23 #include <asm/mb-regs.h>
  24 #include <asm/mb86943a.h>
  25 #include "pci-frv.h"
  26
  27 unsigned int __nongpreldata pci_probe = 1;
  28
  29 int  __nongpreldata pcibios_last_bus = -1;
  30 struct pci_bus *__nongpreldata pci_root_bus;
  31 struct pci_ops *__nongpreldata pci_root_ops;
  32
  33 /*
  34  * Functions for accessing PCI configuration space
  35  */
  36
  37 #define CONFIG_CMD(bus, dev, where) \
  38         (0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
  39
  40 #define __set_PciCfgAddr(A) writel((A), (volatile void __iomem *) __region_CS1 + 0x80)
  41
  42 #define __get_PciCfgDataB(A) readb((volatile void __iomem *) __region_CS1 + 0x88 + ((A) & 3))
  43 #define __get_PciCfgDataW(A) readw((volatile void __iomem *) __region_CS1 + 0x88 + ((A) & 2))
  44 #define __get_PciCfgDataL(A) readl((volatile void __iomem *) __region_CS1 + 0x88)
  45
  46 #define __set_PciCfgDataB(A,V) \
  47         writeb((V), (volatile void __iomem *) __region_CS1 + 0x88 + (3 - ((A) & 3)))
  48
  49 #define __set_PciCfgDataW(A,V) \
  50         writew((V), (volatile void __iomem *) __region_CS1 + 0x88 + (2 - ((A) & 2)))
  51
  52 #define __set_PciCfgDataL(A,V) \
  53         writel((V), (volatile void __iomem *) __region_CS1 + 0x88)
  54
  55 #define __get_PciBridgeDataB(A) readb((volatile void __iomem *) __region_CS1 + 0x800 + (A))
  56 #define __get_PciBridgeDataW(A) readw((volatile void __iomem *) __region_CS1 + 0x800 + (A))
  57 #define __get_PciBridgeDataL(A) readl((volatile void __iomem *) __region_CS1 + 0x800 + (A))
  58
  59 #define __set_PciBridgeDataB(A,V) writeb((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A))
  60 #define __set_PciBridgeDataW(A,V) writew((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A))
  61 #define __set_PciBridgeDataL(A,V) writel((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A))
  62
  63 static inline int __query(const struct pci_dev *dev)
  64 {
  65 //      return dev->bus->number==0 && (dev->devfn==PCI_DEVFN(0,0));
  66 //      return dev->bus->number==1;
  67 //      return dev->bus->number==0 &&
  68 //              (dev->devfn==PCI_DEVFN(2,0) || dev->devfn==PCI_DEVFN(3,0));
  69         return 0;
  70 }
  71
  72 /*****************************************************************************/
  73 /*
  74  *
  75  */
  76 static int pci_frv_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size,
  77                                u32 *val)
  78 {
  79         u32 _value;
  80
  81         if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
  82                 _value = __get_PciBridgeDataL(where & ~3);
  83         }
  84         else {
  85                 __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
  86                 _value = __get_PciCfgDataL(where & ~3);
  87         }
  88
  89         switch (size) {
  90         case 1:
  91                 _value = _value >> ((where & 3) * 8);
  92                 break;
  93
  94         case 2:
  95                 _value = _value >> ((where & 2) * 8);
  96                 break;
  97
  98         case 4:
  99                 break;
 100
 101         default:
 102                 BUG();
 103         }
 104
 105         *val = _value;
 106         return PCIBIOS_SUCCESSFUL;
 107 }
 108
 109 static int pci_frv_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size,
 110                                 u32 value)
 111 {
 112         switch (size) {
 113         case 1:
 114                 if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
 115                         __set_PciBridgeDataB(where, value);
 116                 }
 117                 else {
 118                         __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
 119                         __set_PciCfgDataB(where, value);
 120                 }
 121                 break;
 122
 123         case 2:
 124                 if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
 125                         __set_PciBridgeDataW(where, value);
 126                 }
 127                 else {
 128                         __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
 129                         __set_PciCfgDataW(where, value);
 130                 }
 131                 break;
 132
 133         case 4:
 134                 if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
 135                         __set_PciBridgeDataL(where, value);
 136                 }
 137                 else {
 138                         __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
 139                         __set_PciCfgDataL(where, value);
 140                 }
 141                 break;
 142
 143         default:
 144                 BUG();
 145         }
 146
 147         return PCIBIOS_SUCCESSFUL;
 148 }
 149
 150 static struct pci_ops pci_direct_frv = {
 151         pci_frv_read_config,
 152         pci_frv_write_config,
 153 };
 154
 155 /*
 156  * Before we decide to use direct hardware access mechanisms, we try to do some
 157  * trivial checks to ensure it at least _seems_ to be working -- we just test
 158  * whether bus 00 contains a host bridge (this is similar to checking
 159  * techniques used in XFree86, but ours should be more reliable since we
 160  * attempt to make use of direct access hints provided by the PCI BIOS).
 161  *
 162  * This should be close to trivial, but it isn't, because there are buggy
 163  * chipsets (yes, you guessed it, by Intel and Compaq) that have no class ID.
 164  */
 165 static int __init pci_sanity_check(struct pci_ops *o)
 166 {
 167         struct pci_bus bus;             /* Fake bus and device */
 168         u32 id;
 169
 170         bus.number      = 0;
 171
 172         if (o->read(&bus, 0, PCI_VENDOR_ID, 4, &id) == PCIBIOS_SUCCESSFUL) {
 173                 printk("PCI: VDK Bridge device:vendor: %08x\n", id);
 174                 if (id == 0x200e10cf)
 175                         return 1;
 176         }
 177
 178         printk("PCI: VDK Bridge: Sanity check failed\n");
 179         return 0;
 180 }
 181
 182 static struct pci_ops * __init pci_check_direct(void)
 183 {
 184         unsigned long flags;
 185
 186         local_irq_save(flags);
 187
 188         /* check if access works */
 189         if (pci_sanity_check(&pci_direct_frv)) {
 190                 local_irq_restore(flags);
 191                 printk("PCI: Using configuration frv\n");
 192 //              request_mem_region(0xBE040000, 256, "FRV bridge");
 193 //              request_mem_region(0xBFFFFFF4, 12, "PCI frv");
 194                 return &pci_direct_frv;
 195         }
 196
 197         local_irq_restore(flags);
 198         return NULL;
 199 }
 200
 201 /*
 202  * Several buggy motherboards address only 16 devices and mirror
 203  * them to next 16 IDs. We try to detect this `feature' on all
 204  * primary buses (those containing host bridges as they are
 205  * expected to be unique) and remove the ghost devices.
 206  */
 207
 208 static void __init pcibios_fixup_ghosts(struct pci_bus *b)
 209 {
 210         struct list_head *ln, *mn;
 211         struct pci_dev *d, *e;
 212         int mirror = PCI_DEVFN(16,0);
 213         int seen_host_bridge = 0;
 214         int i;
 215
 216         for (ln=b->devices.next; ln != &b->devices; ln=ln->next) {
 217                 d = pci_dev_b(ln);
 218                 if ((d->class >> 8) == PCI_CLASS_BRIDGE_HOST)
 219                         seen_host_bridge++;
 220                 for (mn=ln->next; mn != &b->devices; mn=mn->next) {
 221                         e = pci_dev_b(mn);
 222                         if (e->devfn != d->devfn + mirror ||
 223                             e->vendor != d->vendor ||
 224                             e->device != d->device ||
 225                             e->class != d->class)
 226                                 continue;
 227                         for(i=0; i<PCI_NUM_RESOURCES; i++)
 228                                 if (e->resource[i].start != d->resource[i].start ||
 229                                     e->resource[i].end != d->resource[i].end ||
 230                                     e->resource[i].flags != d->resource[i].flags)
 231                                         continue;
 232                         break;
 233                 }
 234                 if (mn == &b->devices)
 235                         return;
 236         }
 237         if (!seen_host_bridge)
 238                 return;
 239         printk("PCI: Ignoring ghost devices on bus %02x\n", b->number);
 240
 241         ln = &b->devices;
 242         while (ln->next != &b->devices) {
 243                 d = pci_dev_b(ln->next);
 244                 if (d->devfn >= mirror) {
 245                         list_del(&d->global_list);
 246                         list_del(&d->bus_list);
 247                         kfree(d);
 248                 } else
 249                         ln = ln->next;
 250         }
 251 }
 252
 253 /*
 254  * Discover remaining PCI buses in case there are peer host bridges.
 255  * We use the number of last PCI bus provided by the PCI BIOS.
 256  */
 257 static void __init pcibios_fixup_peer_bridges(void)
 258 {
 259         struct pci_bus bus;
 260         struct pci_dev dev;
 261         int n;
 262         u16 l;
 263
 264         if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff)
 265                 return;
 266         printk("PCI: Peer bridge fixup\n");
 267         for (n=0; n <= pcibios_last_bus; n++) {
 268                 if (pci_find_bus(0, n))
 269                         continue;
 270                 bus.number = n;
 271                 bus.ops = pci_root_ops;
 272                 dev.bus = &bus;
 273                 for(dev.devfn=0; dev.devfn<256; dev.devfn += 8)
 274                         if (!pci_read_config_word(&dev, PCI_VENDOR_ID, &l) &&
 275                             l != 0x0000 && l != 0xffff) {
 276                                 printk("Found device at %02x:%02x [%04x]\n", n, dev.devfn, l);
 277                                 printk("PCI: Discovered peer bus %02x\n", n);
 278                                 pci_scan_bus(n, pci_root_ops, NULL);
 279                                 break;
 280                         }
 281         }
 282 }
 283
 284 /*
 285  * Exceptions for specific devices. Usually work-arounds for fatal design flaws.
 286  */
 287
 288 static void __init pci_fixup_umc_ide(struct pci_dev *d)
 289 {
 290         /*
 291          * UM8886BF IDE controller sets region type bits incorrectly,
 292          * therefore they look like memory despite of them being I/O.
 293          */
 294         int i;
 295
 296         printk("PCI: Fixing base address flags for device %s\n", pci_name(d));
 297         for(i=0; i<4; i++)
 298                 d->resource[i].flags |= PCI_BASE_ADDRESS_SPACE_IO;
 299 }
 300
 301 static void __init pci_fixup_ide_bases(struct pci_dev *d)
 302 {
 303         int i;
 304
 305         /*
 306          * PCI IDE controllers use non-standard I/O port decoding, respect it.
 307          */
 308         if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
 309                 return;
 310         printk("PCI: IDE base address fixup for %s\n", pci_name(d));
 311         for(i=0; i<4; i++) {
 312                 struct resource *r = &d->resource[i];
 313                 if ((r->start & ~0x80) == 0x374) {
 314                         r->start |= 2;
 315                         r->end = r->start;
 316                 }
 317         }
 318 }
 319
 320 static void __init pci_fixup_ide_trash(struct pci_dev *d)
 321 {
 322         int i;
 323
 324         /*
 325          * There exist PCI IDE controllers which have utter garbage
 326          * in first four base registers. Ignore that.
 327          */
 328         printk("PCI: IDE base address trash cleared for %s\n", pci_name(d));
 329         for(i=0; i<4; i++)
 330                 d->resource[i].start = d->resource[i].end = d->resource[i].flags = 0;
 331 }
 332
 333 static void __devinit  pci_fixup_latency(struct pci_dev *d)
 334 {
 335         /*
 336          *  SiS 5597 and 5598 chipsets require latency timer set to
 337          *  at most 32 to avoid lockups.
 338          */
 339         DBG("PCI: Setting max latency to 32\n");
 340         pcibios_max_latency = 32;
 341 }
 342
 343 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886BF, pci_fixup_umc_ide);
 344 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5513, pci_fixup_ide_trash);
 345 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5597, pci_fixup_latency);
 346 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5598, pci_fixup_latency);
 347 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
 348
 349 /*
 350  *  Called after each bus is probed, but before its children
 351  *  are examined.
 352  */
 353
 354 void __init pcibios_fixup_bus(struct pci_bus *bus)
 355 {
 356 #if 0
 357         printk("### PCIBIOS_FIXUP_BUS(%d)\n",bus->number);
 358 #endif
 359         pcibios_fixup_ghosts(bus);
 360         pci_read_bridge_bases(bus);
 361
 362         if (bus->number == 0) {
 363                 struct list_head *ln;
 364                 struct pci_dev *dev;
 365                 for (ln=bus->devices.next; ln != &bus->devices; ln=ln->next) {
 366                         dev = pci_dev_b(ln);
 367                         if (dev->devfn == 0) {
 368                                 dev->resource[0].start = 0;
 369                                 dev->resource[0].end = 0;
 370                         }
 371                 }
 372         }
 373 }
 374
 375 /*
 376  * Initialization. Try all known PCI access methods. Note that we support
 377  * using both PCI BIOS and direct access: in such cases, we use I/O ports
 378  * to access config space, but we still keep BIOS order of cards to be
 379  * compatible with 2.0.X. This should go away some day.
 380  */
 381
 382 int __init pcibios_init(void)
 383 {
 384         struct pci_ops *dir = NULL;
 385
 386         if (!mb93090_mb00_detected)
 387                 return -ENXIO;
 388
 389         __reg_MB86943_sl_ctl |= MB86943_SL_CTL_DRCT_MASTER_SWAP | MB86943_SL_CTL_DRCT_SLAVE_SWAP;
 390
 391         __reg_MB86943_ecs_base(1)       = ((__region_CS2 + 0x01000000) >> 9) | 0x08000000;
 392         __reg_MB86943_ecs_base(2)       = ((__region_CS2 + 0x00000000) >> 9) | 0x08000000;
 393
 394         *(volatile uint32_t *) (__region_CS1 + 0x848) = 0xe0000000;
 395         *(volatile uint32_t *) (__region_CS1 + 0x8b8) = 0x00000000;
 396
 397         __reg_MB86943_sl_pci_io_base    = (__region_CS2 + 0x04000000) >> 9;
 398         __reg_MB86943_sl_pci_mem_base   = (__region_CS2 + 0x08000000) >> 9;
 399         __reg_MB86943_pci_sl_io_base    = __region_CS2 + 0x04000000;
 400         __reg_MB86943_pci_sl_mem_base   = __region_CS2 + 0x08000000;
 401         mb();
 402
 403         /* enable PCI arbitration */
 404         __reg_MB86943_pci_arbiter       = MB86943_PCIARB_EN;
 405
 406         ioport_resource.start   = (__reg_MB86943_sl_pci_io_base << 9) & 0xfffffc00;
 407         ioport_resource.end     = (__reg_MB86943_sl_pci_io_range << 9) | 0x3ff;
 408         ioport_resource.end     += ioport_resource.start;
 409
 410         printk("PCI IO window:  %08llx-%08llx\n",
 411                (unsigned long long) ioport_resource.start,
 412                (unsigned long long) ioport_resource.end);
 413
 414         iomem_resource.start    = (__reg_MB86943_sl_pci_mem_base << 9) & 0xfffffc00;
 415
 416         /* Reserve somewhere to write to flush posted writes. */
 417         iomem_resource.start += 0x400;
 418
 419         iomem_resource.end      = (__reg_MB86943_sl_pci_mem_range << 9) | 0x3ff;
 420         iomem_resource.end      += iomem_resource.start;
 421
 422         printk("PCI MEM window: %08llx-%08llx\n",
 423                (unsigned long long) iomem_resource.start,
 424                (unsigned long long) iomem_resource.end);
 425         printk("PCI DMA memory: %08lx-%08lx\n",
 426                dma_coherent_mem_start, dma_coherent_mem_end);
 427
 428         if (!pci_probe)
 429                 return -ENXIO;
 430
 431         dir = pci_check_direct();
 432         if (dir)
 433                 pci_root_ops = dir;
 434         else {
 435                 printk("PCI: No PCI bus detected\n");
 436                 return -ENXIO;
 437         }
 438
 439         printk("PCI: Probing PCI hardware\n");
 440         pci_root_bus = pci_scan_bus(0, pci_root_ops, NULL);
 441
 442         pcibios_irq_init();
 443         pcibios_fixup_peer_bridges();
 444         pcibios_fixup_irqs();
 445         pcibios_resource_survey();
 446
 447         return 0;
 448 }
 449
 450 arch_initcall(pcibios_init);
 451
 452 char * __init pcibios_setup(char *str)
 453 {
 454         if (!strcmp(str, "off")) {
 455                 pci_probe = 0;
 456                 return NULL;
 457         } else if (!strncmp(str, "lastbus=", 8)) {
 458                 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
 459                 return NULL;
 460         }
 461         return str;
 462 }
 463
 464 int pcibios_enable_device(struct pci_dev *dev, int mask)
 465 {
 466         int err;
 467
 468         if ((err = pcibios_enable_resources(dev, mask)) < 0)
 469                 return err;
 470         if (!dev->msi_enabled)
 471                 pcibios_enable_irq(dev);
 472         return 0;
 473 }