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  * Discover remaining PCI buses in case there are peer host bridges.
 203  * We use the number of last PCI bus provided by the PCI BIOS.
 204  */
 205 static void __init pcibios_fixup_peer_bridges(void)
 206 {
 207         struct pci_bus bus;
 208         struct pci_dev dev;
 209         int n;
 210         u16 l;
 211
 212         if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff)
 213                 return;
 214         printk("PCI: Peer bridge fixup\n");
 215         for (n=0; n <= pcibios_last_bus; n++) {
 216                 if (pci_find_bus(0, n))
 217                         continue;
 218                 bus.number = n;
 219                 bus.ops = pci_root_ops;
 220                 dev.bus = &bus;
 221                 for(dev.devfn=0; dev.devfn<256; dev.devfn += 8)
 222                         if (!pci_read_config_word(&dev, PCI_VENDOR_ID, &l) &&
 223                             l != 0x0000 && l != 0xffff) {
 224                                 printk("Found device at %02x:%02x [%04x]\n", n, dev.devfn, l);
 225                                 printk("PCI: Discovered peer bus %02x\n", n);
 226                                 pci_scan_bus(n, pci_root_ops, NULL);
 227                                 break;
 228                         }
 229         }
 230 }
 231
 232 /*
 233  * Exceptions for specific devices. Usually work-arounds for fatal design flaws.
 234  */
 235
 236 static void __init pci_fixup_umc_ide(struct pci_dev *d)
 237 {
 238         /*
 239          * UM8886BF IDE controller sets region type bits incorrectly,
 240          * therefore they look like memory despite of them being I/O.
 241          */
 242         int i;
 243
 244         printk("PCI: Fixing base address flags for device %s\n", pci_name(d));
 245         for(i=0; i<4; i++)
 246                 d->resource[i].flags |= PCI_BASE_ADDRESS_SPACE_IO;
 247 }
 248
 249 static void __init pci_fixup_ide_bases(struct pci_dev *d)
 250 {
 251         int i;
 252
 253         /*
 254          * PCI IDE controllers use non-standard I/O port decoding, respect it.
 255          */
 256         if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
 257                 return;
 258         printk("PCI: IDE base address fixup for %s\n", pci_name(d));
 259         for(i=0; i<4; i++) {
 260                 struct resource *r = &d->resource[i];
 261                 if ((r->start & ~0x80) == 0x374) {
 262                         r->start |= 2;
 263                         r->end = r->start;
 264                 }
 265         }
 266 }
 267
 268 static void __init pci_fixup_ide_trash(struct pci_dev *d)
 269 {
 270         int i;
 271
 272         /*
 273          * There exist PCI IDE controllers which have utter garbage
 274          * in first four base registers. Ignore that.
 275          */
 276         printk("PCI: IDE base address trash cleared for %s\n", pci_name(d));
 277         for(i=0; i<4; i++)
 278                 d->resource[i].start = d->resource[i].end = d->resource[i].flags = 0;
 279 }
 280
 281 static void __devinit  pci_fixup_latency(struct pci_dev *d)
 282 {
 283         /*
 284          *  SiS 5597 and 5598 chipsets require latency timer set to
 285          *  at most 32 to avoid lockups.
 286          */
 287         DBG("PCI: Setting max latency to 32\n");
 288         pcibios_max_latency = 32;
 289 }
 290
 291 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886BF, pci_fixup_umc_ide);
 292 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5513, pci_fixup_ide_trash);
 293 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5597, pci_fixup_latency);
 294 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5598, pci_fixup_latency);
 295 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
 296
 297 /*
 298  *  Called after each bus is probed, but before its children
 299  *  are examined.
 300  */
 301
 302 void __init pcibios_fixup_bus(struct pci_bus *bus)
 303 {
 304 #if 0
 305         printk("### PCIBIOS_FIXUP_BUS(%d)\n",bus->number);
 306 #endif
 307         pci_read_bridge_bases(bus);
 308
 309         if (bus->number == 0) {
 310                 struct list_head *ln;
 311                 struct pci_dev *dev;
 312                 for (ln=bus->devices.next; ln != &bus->devices; ln=ln->next) {
 313                         dev = pci_dev_b(ln);
 314                         if (dev->devfn == 0) {
 315                                 dev->resource[0].start = 0;
 316                                 dev->resource[0].end = 0;
 317                         }
 318                 }
 319         }
 320 }
 321
 322 /*
 323  * Initialization. Try all known PCI access methods. Note that we support
 324  * using both PCI BIOS and direct access: in such cases, we use I/O ports
 325  * to access config space, but we still keep BIOS order of cards to be
 326  * compatible with 2.0.X. This should go away some day.
 327  */
 328
 329 int __init pcibios_init(void)
 330 {
 331         struct pci_ops *dir = NULL;
 332
 333         if (!mb93090_mb00_detected)
 334                 return -ENXIO;
 335
 336         __reg_MB86943_sl_ctl |= MB86943_SL_CTL_DRCT_MASTER_SWAP | MB86943_SL_CTL_DRCT_SLAVE_SWAP;
 337
 338         __reg_MB86943_ecs_base(1)       = ((__region_CS2 + 0x01000000) >> 9) | 0x08000000;
 339         __reg_MB86943_ecs_base(2)       = ((__region_CS2 + 0x00000000) >> 9) | 0x08000000;
 340
 341         *(volatile uint32_t *) (__region_CS1 + 0x848) = 0xe0000000;
 342         *(volatile uint32_t *) (__region_CS1 + 0x8b8) = 0x00000000;
 343
 344         __reg_MB86943_sl_pci_io_base    = (__region_CS2 + 0x04000000) >> 9;
 345         __reg_MB86943_sl_pci_mem_base   = (__region_CS2 + 0x08000000) >> 9;
 346         __reg_MB86943_pci_sl_io_base    = __region_CS2 + 0x04000000;
 347         __reg_MB86943_pci_sl_mem_base   = __region_CS2 + 0x08000000;
 348         mb();
 349
 350         /* enable PCI arbitration */
 351         __reg_MB86943_pci_arbiter       = MB86943_PCIARB_EN;
 352
 353         ioport_resource.start   = (__reg_MB86943_sl_pci_io_base << 9) & 0xfffffc00;
 354         ioport_resource.end     = (__reg_MB86943_sl_pci_io_range << 9) | 0x3ff;
 355         ioport_resource.end     += ioport_resource.start;
 356
 357         printk("PCI IO window:  %08llx-%08llx\n",
 358                (unsigned long long) ioport_resource.start,
 359                (unsigned long long) ioport_resource.end);
 360
 361         iomem_resource.start    = (__reg_MB86943_sl_pci_mem_base << 9) & 0xfffffc00;
 362
 363         /* Reserve somewhere to write to flush posted writes. */
 364         iomem_resource.start += 0x400;
 365
 366         iomem_resource.end      = (__reg_MB86943_sl_pci_mem_range << 9) | 0x3ff;
 367         iomem_resource.end      += iomem_resource.start;
 368
 369         printk("PCI MEM window: %08llx-%08llx\n",
 370                (unsigned long long) iomem_resource.start,
 371                (unsigned long long) iomem_resource.end);
 372         printk("PCI DMA memory: %08lx-%08lx\n",
 373                dma_coherent_mem_start, dma_coherent_mem_end);
 374
 375         if (!pci_probe)
 376                 return -ENXIO;
 377
 378         dir = pci_check_direct();
 379         if (dir)
 380                 pci_root_ops = dir;
 381         else {
 382                 printk("PCI: No PCI bus detected\n");
 383                 return -ENXIO;
 384         }
 385
 386         printk("PCI: Probing PCI hardware\n");
 387         pci_root_bus = pci_scan_bus(0, pci_root_ops, NULL);
 388
 389         pcibios_irq_init();
 390         pcibios_fixup_peer_bridges();
 391         pcibios_fixup_irqs();
 392         pcibios_resource_survey();
 393
 394         return 0;
 395 }
 396
 397 arch_initcall(pcibios_init);
 398
 399 char * __init pcibios_setup(char *str)
 400 {
 401         if (!strcmp(str, "off")) {
 402                 pci_probe = 0;
 403                 return NULL;
 404         } else if (!strncmp(str, "lastbus=", 8)) {
 405                 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
 406                 return NULL;
 407         }
 408         return str;
 409 }
 410
 411 int pcibios_enable_device(struct pci_dev *dev, int mask)
 412 {
 413         int err;
 414
 415         if ((err = pcibios_enable_resources(dev, mask)) < 0)
 416                 return err;
 417         if (!dev->msi_enabled)
 418                 pcibios_enable_irq(dev);
 419         return 0;
 420 }