drivers/char/agp/hp-agp.c

   1 /*
   2  * HP zx1 AGPGART routines.
   3  *
   4  * (c) Copyright 2002, 2003 Hewlett-Packard Development Company, L.P.
   5  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/acpi.h>
  13 #include <linux/module.h>
  14 #include <linux/pci.h>
  15 #include <linux/init.h>
  16 #include <linux/agp_backend.h>
  17
  18 #include <asm/acpi-ext.h>
  19
  20 #include "agp.h"
  21
  22 #ifndef log2
  23 #define log2(x)         ffz(~(x))
  24 #endif
  25
  26 #define HP_ZX1_IOC_OFFSET       0x1000  /* ACPI reports SBA, we want IOC */
  27
  28 /* HP ZX1 IOC registers */
  29 #define HP_ZX1_IBASE            0x300
  30 #define HP_ZX1_IMASK            0x308
  31 #define HP_ZX1_PCOM             0x310
  32 #define HP_ZX1_TCNFG            0x318
  33 #define HP_ZX1_PDIR_BASE        0x320
  34
  35 #define HP_ZX1_IOVA_BASE        GB(1UL)
  36 #define HP_ZX1_IOVA_SIZE        GB(1UL)
  37 #define HP_ZX1_GART_SIZE        (HP_ZX1_IOVA_SIZE / 2)
  38 #define HP_ZX1_SBA_IOMMU_COOKIE 0x0000badbadc0ffeeUL
  39
  40 #define HP_ZX1_PDIR_VALID_BIT   0x8000000000000000UL
  41 #define HP_ZX1_IOVA_TO_PDIR(va) ((va - hp_private.iova_base) >> hp_private.io_tlb_shift)
  42
  43 #define AGP8X_MODE_BIT          3
  44 #define AGP8X_MODE              (1 << AGP8X_MODE_BIT)
  45
  46 /* AGP bridge need not be PCI device, but DRM thinks it is. */
  47 static struct pci_dev fake_bridge_dev;
  48
  49 static int hp_zx1_gart_found;
  50
  51 static struct aper_size_info_fixed hp_zx1_sizes[] =
  52 {
  53         {0, 0, 0},              /* filled in by hp_zx1_fetch_size() */
  54 };
  55
  56 static struct gatt_mask hp_zx1_masks[] =
  57 {
  58         {.mask = HP_ZX1_PDIR_VALID_BIT, .type = 0}
  59 };
  60
  61 static struct _hp_private {
  62         volatile u8 __iomem *ioc_regs;
  63         volatile u8 __iomem *lba_regs;
  64         int lba_cap_offset;
  65         u64 *io_pdir;           // PDIR for entire IOVA
  66         u64 *gatt;              // PDIR just for GART (subset of above)
  67         u64 gatt_entries;
  68         u64 iova_base;
  69         u64 gart_base;
  70         u64 gart_size;
  71         u64 io_pdir_size;
  72         int io_pdir_owner;      // do we own it, or share it with sba_iommu?
  73         int io_page_size;
  74         int io_tlb_shift;
  75         int io_tlb_ps;          // IOC ps config
  76         int io_pages_per_kpage;
  77 } hp_private;
  78
  79 static int __init hp_zx1_ioc_shared(void)
  80 {
  81         struct _hp_private *hp = &hp_private;
  82
  83         printk(KERN_INFO PFX "HP ZX1 IOC: IOPDIR shared with sba_iommu\n");
  84
  85         /*
  86          * IOC already configured by sba_iommu module; just use
  87          * its setup.  We assume:
  88          *      - IOVA space is 1Gb in size
  89          *      - first 512Mb is IOMMU, second 512Mb is GART
  90          */
  91         hp->io_tlb_ps = readq(hp->ioc_regs+HP_ZX1_TCNFG);
  92         switch (hp->io_tlb_ps) {
  93                 case 0: hp->io_tlb_shift = 12; break;
  94                 case 1: hp->io_tlb_shift = 13; break;
  95                 case 2: hp->io_tlb_shift = 14; break;
  96                 case 3: hp->io_tlb_shift = 16; break;
  97                 default:
  98                         printk(KERN_ERR PFX "Invalid IOTLB page size "
  99                                "configuration 0x%x\n", hp->io_tlb_ps);
 100                         hp->gatt = NULL;
 101                         hp->gatt_entries = 0;
 102                         return -ENODEV;
 103         }
 104         hp->io_page_size = 1 << hp->io_tlb_shift;
 105         hp->io_pages_per_kpage = PAGE_SIZE / hp->io_page_size;
 106
 107         hp->iova_base = readq(hp->ioc_regs+HP_ZX1_IBASE) & ~0x1;
 108         hp->gart_base = hp->iova_base + HP_ZX1_IOVA_SIZE - HP_ZX1_GART_SIZE;
 109
 110         hp->gart_size = HP_ZX1_GART_SIZE;
 111         hp->gatt_entries = hp->gart_size / hp->io_page_size;
 112
 113         hp->io_pdir = gart_to_virt(readq(hp->ioc_regs+HP_ZX1_PDIR_BASE));
 114         hp->gatt = &hp->io_pdir[HP_ZX1_IOVA_TO_PDIR(hp->gart_base)];
 115
 116         if (hp->gatt[0] != HP_ZX1_SBA_IOMMU_COOKIE) {
 117                 /* Normal case when no AGP device in system */
 118                 hp->gatt = NULL;
 119                 hp->gatt_entries = 0;
 120                 printk(KERN_ERR PFX "No reserved IO PDIR entry found; "
 121                        "GART disabled\n");
 122                 return -ENODEV;
 123         }
 124
 125         return 0;
 126 }
 127
 128 static int __init
 129 hp_zx1_ioc_owner (void)
 130 {
 131         struct _hp_private *hp = &hp_private;
 132
 133         printk(KERN_INFO PFX "HP ZX1 IOC: IOPDIR dedicated to GART\n");
 134
 135         /*
 136          * Select an IOV page size no larger than system page size.
 137          */
 138         if (PAGE_SIZE >= KB(64)) {
 139                 hp->io_tlb_shift = 16;
 140                 hp->io_tlb_ps = 3;
 141         } else if (PAGE_SIZE >= KB(16)) {
 142                 hp->io_tlb_shift = 14;
 143                 hp->io_tlb_ps = 2;
 144         } else if (PAGE_SIZE >= KB(8)) {
 145                 hp->io_tlb_shift = 13;
 146                 hp->io_tlb_ps = 1;
 147         } else {
 148                 hp->io_tlb_shift = 12;
 149                 hp->io_tlb_ps = 0;
 150         }
 151         hp->io_page_size = 1 << hp->io_tlb_shift;
 152         hp->io_pages_per_kpage = PAGE_SIZE / hp->io_page_size;
 153
 154         hp->iova_base = HP_ZX1_IOVA_BASE;
 155         hp->gart_size = HP_ZX1_GART_SIZE;
 156         hp->gart_base = hp->iova_base + HP_ZX1_IOVA_SIZE - hp->gart_size;
 157
 158         hp->gatt_entries = hp->gart_size / hp->io_page_size;
 159         hp->io_pdir_size = (HP_ZX1_IOVA_SIZE / hp->io_page_size) * sizeof(u64);
 160
 161         return 0;
 162 }
 163
 164 static int __init
 165 hp_zx1_ioc_init (u64 hpa)
 166 {
 167         struct _hp_private *hp = &hp_private;
 168
 169         hp->ioc_regs = ioremap(hpa, 1024);
 170         if (!hp->ioc_regs)
 171                 return -ENOMEM;
 172
 173         /*
 174          * If the IOTLB is currently disabled, we can take it over.
 175          * Otherwise, we have to share with sba_iommu.
 176          */
 177         hp->io_pdir_owner = (readq(hp->ioc_regs+HP_ZX1_IBASE) & 0x1) == 0;
 178
 179         if (hp->io_pdir_owner)
 180                 return hp_zx1_ioc_owner();
 181
 182         return hp_zx1_ioc_shared();
 183 }
 184
 185 static int
 186 hp_zx1_lba_find_capability (volatile u8 __iomem *hpa, int cap)
 187 {
 188         u16 status;
 189         u8 pos, id;
 190         int ttl = 48;
 191
 192         status = readw(hpa+PCI_STATUS);
 193         if (!(status & PCI_STATUS_CAP_LIST))
 194                 return 0;
 195         pos = readb(hpa+PCI_CAPABILITY_LIST);
 196         while (ttl-- && pos >= 0x40) {
 197                 pos &= ~3;
 198                 id = readb(hpa+pos+PCI_CAP_LIST_ID);
 199                 if (id == 0xff)
 200                         break;
 201                 if (id == cap)
 202                         return pos;
 203                 pos = readb(hpa+pos+PCI_CAP_LIST_NEXT);
 204         }
 205         return 0;
 206 }
 207
 208 static int __init
 209 hp_zx1_lba_init (u64 hpa)
 210 {
 211         struct _hp_private *hp = &hp_private;
 212         int cap;
 213
 214         hp->lba_regs = ioremap(hpa, 256);
 215         if (!hp->lba_regs)
 216                 return -ENOMEM;
 217
 218         hp->lba_cap_offset = hp_zx1_lba_find_capability(hp->lba_regs, PCI_CAP_ID_AGP);
 219
 220         cap = readl(hp->lba_regs+hp->lba_cap_offset) & 0xff;
 221         if (cap != PCI_CAP_ID_AGP) {
 222                 printk(KERN_ERR PFX "Invalid capability ID 0x%02x at 0x%x\n",
 223                        cap, hp->lba_cap_offset);
 224                 return -ENODEV;
 225         }
 226
 227         return 0;
 228 }
 229
 230 static int
 231 hp_zx1_fetch_size(void)
 232 {
 233         int size;
 234
 235         size = hp_private.gart_size / MB(1);
 236         hp_zx1_sizes[0].size = size;
 237         agp_bridge->current_size = (void *) &hp_zx1_sizes[0];
 238         return size;
 239 }
 240
 241 static int
 242 hp_zx1_configure (void)
 243 {
 244         struct _hp_private *hp = &hp_private;
 245
 246         agp_bridge->gart_bus_addr = hp->gart_base;
 247         agp_bridge->capndx = hp->lba_cap_offset;
 248         agp_bridge->mode = readl(hp->lba_regs+hp->lba_cap_offset+PCI_AGP_STATUS);
 249
 250         if (hp->io_pdir_owner) {
 251                 writel(virt_to_gart(hp->io_pdir), hp->ioc_regs+HP_ZX1_PDIR_BASE);
 252                 readl(hp->ioc_regs+HP_ZX1_PDIR_BASE);
 253                 writel(hp->io_tlb_ps, hp->ioc_regs+HP_ZX1_TCNFG);
 254                 readl(hp->ioc_regs+HP_ZX1_TCNFG);
 255                 writel((unsigned int)(~(HP_ZX1_IOVA_SIZE-1)), hp->ioc_regs+HP_ZX1_IMASK);
 256                 readl(hp->ioc_regs+HP_ZX1_IMASK);
 257                 writel(hp->iova_base|1, hp->ioc_regs+HP_ZX1_IBASE);
 258                 readl(hp->ioc_regs+HP_ZX1_IBASE);
 259                 writel(hp->iova_base|log2(HP_ZX1_IOVA_SIZE), hp->ioc_regs+HP_ZX1_PCOM);
 260                 readl(hp->ioc_regs+HP_ZX1_PCOM);
 261         }
 262
 263         return 0;
 264 }
 265
 266 static void
 267 hp_zx1_cleanup (void)
 268 {
 269         struct _hp_private *hp = &hp_private;
 270
 271         if (hp->ioc_regs) {
 272                 if (hp->io_pdir_owner) {
 273                         writeq(0, hp->ioc_regs+HP_ZX1_IBASE);
 274                         readq(hp->ioc_regs+HP_ZX1_IBASE);
 275                 }
 276                 iounmap(hp->ioc_regs);
 277         }
 278         if (hp->lba_regs)
 279                 iounmap(hp->lba_regs);
 280 }
 281
 282 static void
 283 hp_zx1_tlbflush (struct agp_memory *mem)
 284 {
 285         struct _hp_private *hp = &hp_private;
 286
 287         writeq(hp->gart_base | log2(hp->gart_size), hp->ioc_regs+HP_ZX1_PCOM);
 288         readq(hp->ioc_regs+HP_ZX1_PCOM);
 289 }
 290
 291 static int
 292 hp_zx1_create_gatt_table (struct agp_bridge_data *bridge)
 293 {
 294         struct _hp_private *hp = &hp_private;
 295         int i;
 296
 297         if (hp->io_pdir_owner) {
 298                 hp->io_pdir = (u64 *) __get_free_pages(GFP_KERNEL,
 299                                                 get_order(hp->io_pdir_size));
 300                 if (!hp->io_pdir) {
 301                         printk(KERN_ERR PFX "Couldn't allocate contiguous "
 302                                 "memory for I/O PDIR\n");
 303                         hp->gatt = NULL;
 304                         hp->gatt_entries = 0;
 305                         return -ENOMEM;
 306                 }
 307                 memset(hp->io_pdir, 0, hp->io_pdir_size);
 308
 309                 hp->gatt = &hp->io_pdir[HP_ZX1_IOVA_TO_PDIR(hp->gart_base)];
 310         }
 311
 312         for (i = 0; i < hp->gatt_entries; i++) {
 313                 hp->gatt[i] = (unsigned long) agp_bridge->scratch_page;
 314         }
 315
 316         return 0;
 317 }
 318
 319 static int
 320 hp_zx1_free_gatt_table (struct agp_bridge_data *bridge)
 321 {
 322         struct _hp_private *hp = &hp_private;
 323
 324         if (hp->io_pdir_owner)
 325                 free_pages((unsigned long) hp->io_pdir,
 326                             get_order(hp->io_pdir_size));
 327         else
 328                 hp->gatt[0] = HP_ZX1_SBA_IOMMU_COOKIE;
 329         return 0;
 330 }
 331
 332 static int
 333 hp_zx1_insert_memory (struct agp_memory *mem, off_t pg_start, int type)
 334 {
 335         struct _hp_private *hp = &hp_private;
 336         int i, k;
 337         off_t j, io_pg_start;
 338         int io_pg_count;
 339
 340         if (type != 0 || mem->type != 0) {
 341                 return -EINVAL;
 342         }
 343
 344         io_pg_start = hp->io_pages_per_kpage * pg_start;
 345         io_pg_count = hp->io_pages_per_kpage * mem->page_count;
 346         if ((io_pg_start + io_pg_count) > hp->gatt_entries) {
 347                 return -EINVAL;
 348         }
 349
 350         j = io_pg_start;
 351         while (j < (io_pg_start + io_pg_count)) {
 352                 if (hp->gatt[j]) {
 353                         return -EBUSY;
 354                 }
 355                 j++;
 356         }
 357
 358         if (mem->is_flushed == FALSE) {
 359                 global_cache_flush();
 360                 mem->is_flushed = TRUE;
 361         }
 362
 363         for (i = 0, j = io_pg_start; i < mem->page_count; i++) {
 364                 unsigned long paddr;
 365
 366                 paddr = mem->memory[i];
 367                 for (k = 0;
 368                      k < hp->io_pages_per_kpage;
 369                      k++, j++, paddr += hp->io_page_size) {
 370                         hp->gatt[j] =
 371                                 agp_bridge->driver->mask_memory(agp_bridge,
 372                                         paddr, type);
 373                 }
 374         }
 375
 376         agp_bridge->driver->tlb_flush(mem);
 377         return 0;
 378 }
 379
 380 static int
 381 hp_zx1_remove_memory (struct agp_memory *mem, off_t pg_start, int type)
 382 {
 383         struct _hp_private *hp = &hp_private;
 384         int i, io_pg_start, io_pg_count;
 385
 386         if (type != 0 || mem->type != 0) {
 387                 return -EINVAL;
 388         }
 389
 390         io_pg_start = hp->io_pages_per_kpage * pg_start;
 391         io_pg_count = hp->io_pages_per_kpage * mem->page_count;
 392         for (i = io_pg_start; i < io_pg_count + io_pg_start; i++) {
 393                 hp->gatt[i] = agp_bridge->scratch_page;
 394         }
 395
 396         agp_bridge->driver->tlb_flush(mem);
 397         return 0;
 398 }
 399
 400 static unsigned long
 401 hp_zx1_mask_memory (struct agp_bridge_data *bridge,
 402         unsigned long addr, int type)
 403 {
 404         return HP_ZX1_PDIR_VALID_BIT | addr;
 405 }
 406
 407 static void
 408 hp_zx1_enable (struct agp_bridge_data *bridge, u32 mode)
 409 {
 410         struct _hp_private *hp = &hp_private;
 411         u32 command;
 412
 413         command = readl(hp->lba_regs+hp->lba_cap_offset+PCI_AGP_STATUS);
 414         command = agp_collect_device_status(bridge, mode, command);
 415         command |= 0x00000100;
 416
 417         writel(command, hp->lba_regs+hp->lba_cap_offset+PCI_AGP_COMMAND);
 418
 419         agp_device_command(command, (mode & AGP8X_MODE) != 0);
 420 }
 421
 422 struct agp_bridge_driver hp_zx1_driver = {
 423         .owner                  = THIS_MODULE,
 424         .size_type              = FIXED_APER_SIZE,
 425         .configure              = hp_zx1_configure,
 426         .fetch_size             = hp_zx1_fetch_size,
 427         .cleanup                = hp_zx1_cleanup,
 428         .tlb_flush              = hp_zx1_tlbflush,
 429         .mask_memory            = hp_zx1_mask_memory,
 430         .masks                  = hp_zx1_masks,
 431         .agp_enable             = hp_zx1_enable,
 432         .cache_flush            = global_cache_flush,
 433         .create_gatt_table      = hp_zx1_create_gatt_table,
 434         .free_gatt_table        = hp_zx1_free_gatt_table,
 435         .insert_memory          = hp_zx1_insert_memory,
 436         .remove_memory          = hp_zx1_remove_memory,
 437         .alloc_by_type          = agp_generic_alloc_by_type,
 438         .free_by_type           = agp_generic_free_by_type,
 439         .agp_alloc_page         = agp_generic_alloc_page,
 440         .agp_destroy_page       = agp_generic_destroy_page,
 441         .cant_use_aperture      = 1,
 442 };
 443
 444 static int __init
 445 hp_zx1_setup (u64 ioc_hpa, u64 lba_hpa)
 446 {
 447         struct agp_bridge_data *bridge;
 448         int error = 0;
 449
 450         error = hp_zx1_ioc_init(ioc_hpa);
 451         if (error)
 452                 goto fail;
 453
 454         error = hp_zx1_lba_init(lba_hpa);
 455         if (error)
 456                 goto fail;
 457
 458         bridge = agp_alloc_bridge();
 459         if (!bridge) {
 460                 error = -ENOMEM;
 461                 goto fail;
 462         }
 463         bridge->driver = &hp_zx1_driver;
 464
 465         fake_bridge_dev.vendor = PCI_VENDOR_ID_HP;
 466         fake_bridge_dev.device = PCI_DEVICE_ID_HP_PCIX_LBA;
 467         bridge->dev = &fake_bridge_dev;
 468
 469         error = agp_add_bridge(bridge);
 470   fail:
 471         if (error)
 472                 hp_zx1_cleanup();
 473         return error;
 474 }
 475
 476 static acpi_status __init
 477 zx1_gart_probe (acpi_handle obj, u32 depth, void *context, void **ret)
 478 {
 479         acpi_handle handle, parent;
 480         acpi_status status;
 481         struct acpi_buffer buffer;
 482         struct acpi_device_info *info;
 483         u64 lba_hpa, sba_hpa, length;
 484         int match;
 485
 486         status = hp_acpi_csr_space(obj, &lba_hpa, &length);
 487         if (ACPI_FAILURE(status))
 488                 return AE_OK; /* keep looking for another bridge */
 489
 490         /* Look for an enclosing IOC scope and find its CSR space */
 491         handle = obj;
 492         do {
 493                 buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
 494                 status = acpi_get_object_info(handle, &buffer);
 495                 if (ACPI_SUCCESS(status)) {
 496                         /* TBD check _CID also */
 497                         info = buffer.pointer;
 498                         info->hardware_id.value[sizeof(info->hardware_id)-1] = '\0';
 499                         match = (strcmp(info->hardware_id.value, "HWP0001") == 0);
 500                         kfree(info);
 501                         if (match) {
 502                                 status = hp_acpi_csr_space(handle, &sba_hpa, &length);
 503                                 if (ACPI_SUCCESS(status))
 504                                         break;
 505                                 else {
 506                                         printk(KERN_ERR PFX "Detected HP ZX1 "
 507                                                "AGP LBA but no IOC.\n");
 508                                         return AE_OK;
 509                                 }
 510                         }
 511                 }
 512
 513                 status = acpi_get_parent(handle, &parent);
 514                 handle = parent;
 515         } while (ACPI_SUCCESS(status));
 516
 517         if (hp_zx1_setup(sba_hpa + HP_ZX1_IOC_OFFSET, lba_hpa))
 518                 return AE_OK;
 519
 520         printk(KERN_INFO PFX "Detected HP ZX1 %s AGP chipset (ioc=%lx, lba=%lx)\n",
 521                 (char *) context, sba_hpa + HP_ZX1_IOC_OFFSET, lba_hpa);
 522
 523         hp_zx1_gart_found = 1;
 524         return AE_CTRL_TERMINATE; /* we only support one bridge; quit looking */
 525 }
 526
 527 static int __init
 528 agp_hp_init (void)
 529 {
 530         if (agp_off)
 531                 return -EINVAL;
 532
 533         acpi_get_devices("HWP0003", zx1_gart_probe, "HWP0003", NULL);
 534         if (hp_zx1_gart_found)
 535                 return 0;
 536
 537         acpi_get_devices("HWP0007", zx1_gart_probe, "HWP0007", NULL);
 538         if (hp_zx1_gart_found)
 539                 return 0;
 540
 541         return -ENODEV;
 542 }
 543
 544 static void __exit
 545 agp_hp_cleanup (void)
 546 {
 547 }
 548
 549 module_init(agp_hp_init);
 550 module_exit(agp_hp_cleanup);
 551
 552 MODULE_LICENSE("GPL and additional rights");