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 #include <linux/log2.h>
  18 #include <linux/slab.h>
  19
  20 #include <asm/acpi-ext.h>
  21
  22 #include "agp.h"
  23
  24 #define HP_ZX1_IOC_OFFSET       0x1000  /* ACPI reports SBA, we want IOC */
  25
  26 /* HP ZX1 IOC registers */
  27 #define HP_ZX1_IBASE            0x300
  28 #define HP_ZX1_IMASK            0x308
  29 #define HP_ZX1_PCOM             0x310
  30 #define HP_ZX1_TCNFG            0x318
  31 #define HP_ZX1_PDIR_BASE        0x320
  32
  33 #define HP_ZX1_IOVA_BASE        GB(1UL)
  34 #define HP_ZX1_IOVA_SIZE        GB(1UL)
  35 #define HP_ZX1_GART_SIZE        (HP_ZX1_IOVA_SIZE / 2)
  36 #define HP_ZX1_SBA_IOMMU_COOKIE 0x0000badbadc0ffeeUL
  37
  38 #define HP_ZX1_PDIR_VALID_BIT   0x8000000000000000UL
  39 #define HP_ZX1_IOVA_TO_PDIR(va) ((va - hp_private.iova_base) >> hp_private.io_tlb_shift)
  40
  41 #define AGP8X_MODE_BIT          3
  42 #define AGP8X_MODE              (1 << AGP8X_MODE_BIT)
  43
  44 /* AGP bridge need not be PCI device, but DRM thinks it is. */
  45 static struct pci_dev fake_bridge_dev;
  46
  47 static int hp_zx1_gart_found;
  48
  49 static struct aper_size_info_fixed hp_zx1_sizes[] =
  50 {
  51         {0, 0, 0},              /* filled in by hp_zx1_fetch_size() */
  52 };
  53
  54 static struct gatt_mask hp_zx1_masks[] =
  55 {
  56         {.mask = HP_ZX1_PDIR_VALID_BIT, .type = 0}
  57 };
  58
  59 static struct _hp_private {
  60         volatile u8 __iomem *ioc_regs;
  61         volatile u8 __iomem *lba_regs;
  62         int lba_cap_offset;
  63         u64 *io_pdir;           // PDIR for entire IOVA
  64         u64 *gatt;              // PDIR just for GART (subset of above)
  65         u64 gatt_entries;
  66         u64 iova_base;
  67         u64 gart_base;
  68         u64 gart_size;
  69         u64 io_pdir_size;
  70         int io_pdir_owner;      // do we own it, or share it with sba_iommu?
  71         int io_page_size;
  72         int io_tlb_shift;
  73         int io_tlb_ps;          // IOC ps config
  74         int io_pages_per_kpage;
  75 } hp_private;
  76
  77 static int __init hp_zx1_ioc_shared(void)
  78 {
  79         struct _hp_private *hp = &hp_private;
  80
  81         printk(KERN_INFO PFX "HP ZX1 IOC: IOPDIR shared with sba_iommu\n");
  82
  83         /*
  84          * IOC already configured by sba_iommu module; just use
  85          * its setup.  We assume:
  86          *      - IOVA space is 1Gb in size
  87          *      - first 512Mb is IOMMU, second 512Mb is GART
  88          */
  89         hp->io_tlb_ps = readq(hp->ioc_regs+HP_ZX1_TCNFG);
  90         switch (hp->io_tlb_ps) {
  91                 case 0: hp->io_tlb_shift = 12; break;
  92                 case 1: hp->io_tlb_shift = 13; break;
  93                 case 2: hp->io_tlb_shift = 14; break;
  94                 case 3: hp->io_tlb_shift = 16; break;
  95                 default:
  96                         printk(KERN_ERR PFX "Invalid IOTLB page size "
  97                                "configuration 0x%x\n", hp->io_tlb_ps);
  98                         hp->gatt = NULL;
  99                         hp->gatt_entries = 0;
 100                         return -ENODEV;
 101         }
 102         hp->io_page_size = 1 << hp->io_tlb_shift;
 103         hp->io_pages_per_kpage = PAGE_SIZE / hp->io_page_size;
 104
 105         hp->iova_base = readq(hp->ioc_regs+HP_ZX1_IBASE) & ~0x1;
 106         hp->gart_base = hp->iova_base + HP_ZX1_IOVA_SIZE - HP_ZX1_GART_SIZE;
 107
 108         hp->gart_size = HP_ZX1_GART_SIZE;
 109         hp->gatt_entries = hp->gart_size / hp->io_page_size;
 110
 111         hp->io_pdir = phys_to_virt(readq(hp->ioc_regs+HP_ZX1_PDIR_BASE));
 112         hp->gatt = &hp->io_pdir[HP_ZX1_IOVA_TO_PDIR(hp->gart_base)];
 113
 114         if (hp->gatt[0] != HP_ZX1_SBA_IOMMU_COOKIE) {
 115                 /* Normal case when no AGP device in system */
 116                 hp->gatt = NULL;
 117                 hp->gatt_entries = 0;
 118                 printk(KERN_ERR PFX "No reserved IO PDIR entry found; "
 119                        "GART disabled\n");
 120                 return -ENODEV;
 121         }
 122
 123         return 0;
 124 }
 125
 126 static int __init
 127 hp_zx1_ioc_owner (void)
 128 {
 129         struct _hp_private *hp = &hp_private;
 130
 131         printk(KERN_INFO PFX "HP ZX1 IOC: IOPDIR dedicated to GART\n");
 132
 133         /*
 134          * Select an IOV page size no larger than system page size.
 135          */
 136         if (PAGE_SIZE >= KB(64)) {
 137                 hp->io_tlb_shift = 16;
 138                 hp->io_tlb_ps = 3;
 139         } else if (PAGE_SIZE >= KB(16)) {
 140                 hp->io_tlb_shift = 14;
 141                 hp->io_tlb_ps = 2;
 142         } else if (PAGE_SIZE >= KB(8)) {
 143                 hp->io_tlb_shift = 13;
 144                 hp->io_tlb_ps = 1;
 145         } else {
 146                 hp->io_tlb_shift = 12;
 147                 hp->io_tlb_ps = 0;
 148         }
 149         hp->io_page_size = 1 << hp->io_tlb_shift;
 150         hp->io_pages_per_kpage = PAGE_SIZE / hp->io_page_size;
 151
 152         hp->iova_base = HP_ZX1_IOVA_BASE;
 153         hp->gart_size = HP_ZX1_GART_SIZE;
 154         hp->gart_base = hp->iova_base + HP_ZX1_IOVA_SIZE - hp->gart_size;
 155
 156         hp->gatt_entries = hp->gart_size / hp->io_page_size;
 157         hp->io_pdir_size = (HP_ZX1_IOVA_SIZE / hp->io_page_size) * sizeof(u64);
 158
 159         return 0;
 160 }
 161
 162 static int __init
 163 hp_zx1_ioc_init (u64 hpa)
 164 {
 165         struct _hp_private *hp = &hp_private;
 166
 167         hp->ioc_regs = ioremap(hpa, 1024);
 168         if (!hp->ioc_regs)
 169                 return -ENOMEM;
 170
 171         /*
 172          * If the IOTLB is currently disabled, we can take it over.
 173          * Otherwise, we have to share with sba_iommu.
 174          */
 175         hp->io_pdir_owner = (readq(hp->ioc_regs+HP_ZX1_IBASE) & 0x1) == 0;
 176
 177         if (hp->io_pdir_owner)
 178                 return hp_zx1_ioc_owner();
 179
 180         return hp_zx1_ioc_shared();
 181 }
 182
 183 static int
 184 hp_zx1_lba_find_capability (volatile u8 __iomem *hpa, int cap)
 185 {
 186         u16 status;
 187         u8 pos, id;
 188         int ttl = 48;
 189
 190         status = readw(hpa+PCI_STATUS);
 191         if (!(status & PCI_STATUS_CAP_LIST))
 192                 return 0;
 193         pos = readb(hpa+PCI_CAPABILITY_LIST);
 194         while (ttl-- && pos >= 0x40) {
 195                 pos &= ~3;
 196                 id = readb(hpa+pos+PCI_CAP_LIST_ID);
 197                 if (id == 0xff)
 198                         break;
 199                 if (id == cap)
 200                         return pos;
 201                 pos = readb(hpa+pos+PCI_CAP_LIST_NEXT);
 202         }
 203         return 0;
 204 }
 205
 206 static int __init
 207 hp_zx1_lba_init (u64 hpa)
 208 {
 209         struct _hp_private *hp = &hp_private;
 210         int cap;
 211
 212         hp->lba_regs = ioremap(hpa, 256);
 213         if (!hp->lba_regs)
 214                 return -ENOMEM;
 215
 216         hp->lba_cap_offset = hp_zx1_lba_find_capability(hp->lba_regs, PCI_CAP_ID_AGP);
 217
 218         cap = readl(hp->lba_regs+hp->lba_cap_offset) & 0xff;
 219         if (cap != PCI_CAP_ID_AGP) {
 220                 printk(KERN_ERR PFX "Invalid capability ID 0x%02x at 0x%x\n",
 221                        cap, hp->lba_cap_offset);
 222                 iounmap(hp->lba_regs);
 223                 return -ENODEV;
 224         }
 225
 226         return 0;
 227 }
 228
 229 static int
 230 hp_zx1_fetch_size(void)
 231 {
 232         int size;
 233
 234         size = hp_private.gart_size / MB(1);
 235         hp_zx1_sizes[0].size = size;
 236         agp_bridge->current_size = (void *) &hp_zx1_sizes[0];
 237         return size;
 238 }
 239
 240 static int
 241 hp_zx1_configure (void)
 242 {
 243         struct _hp_private *hp = &hp_private;
 244
 245         agp_bridge->gart_bus_addr = hp->gart_base;
 246         agp_bridge->capndx = hp->lba_cap_offset;
 247         agp_bridge->mode = readl(hp->lba_regs+hp->lba_cap_offset+PCI_AGP_STATUS);
 248
 249         if (hp->io_pdir_owner) {
 250                 writel(virt_to_phys(hp->io_pdir), hp->ioc_regs+HP_ZX1_PDIR_BASE);
 251                 readl(hp->ioc_regs+HP_ZX1_PDIR_BASE);
 252                 writel(hp->io_tlb_ps, hp->ioc_regs+HP_ZX1_TCNFG);
 253                 readl(hp->ioc_regs+HP_ZX1_TCNFG);
 254                 writel((unsigned int)(~(HP_ZX1_IOVA_SIZE-1)), hp->ioc_regs+HP_ZX1_IMASK);
 255                 readl(hp->ioc_regs+HP_ZX1_IMASK);
 256                 writel(hp->iova_base|1, hp->ioc_regs+HP_ZX1_IBASE);
 257                 readl(hp->ioc_regs+HP_ZX1_IBASE);
 258                 writel(hp->iova_base|ilog2(HP_ZX1_IOVA_SIZE), hp->ioc_regs+HP_ZX1_PCOM);
 259                 readl(hp->ioc_regs+HP_ZX1_PCOM);
 260         }
 261
 262         return 0;
 263 }
 264
 265 static void
 266 hp_zx1_cleanup (void)
 267 {
 268         struct _hp_private *hp = &hp_private;
 269
 270         if (hp->ioc_regs) {
 271                 if (hp->io_pdir_owner) {
 272                         writeq(0, hp->ioc_regs+HP_ZX1_IBASE);
 273                         readq(hp->ioc_regs+HP_ZX1_IBASE);
 274                 }
 275                 iounmap(hp->ioc_regs);
 276         }
 277         if (hp->lba_regs)
 278                 iounmap(hp->lba_regs);
 279 }
 280
 281 static void
 282 hp_zx1_tlbflush (struct agp_memory *mem)
 283 {
 284         struct _hp_private *hp = &hp_private;
 285
 286         writeq(hp->gart_base | ilog2(hp->gart_size), hp->ioc_regs+HP_ZX1_PCOM);
 287         readq(hp->ioc_regs+HP_ZX1_PCOM);
 288 }
 289
 290 static int
 291 hp_zx1_create_gatt_table (struct agp_bridge_data *bridge)
 292 {
 293         struct _hp_private *hp = &hp_private;
 294         int i;
 295
 296         if (hp->io_pdir_owner) {
 297                 hp->io_pdir = (u64 *) __get_free_pages(GFP_KERNEL,
 298                                                 get_order(hp->io_pdir_size));
 299                 if (!hp->io_pdir) {
 300                         printk(KERN_ERR PFX "Couldn't allocate contiguous "
 301                                 "memory for I/O PDIR\n");
 302                         hp->gatt = NULL;
 303                         hp->gatt_entries = 0;
 304                         return -ENOMEM;
 305                 }
 306                 memset(hp->io_pdir, 0, hp->io_pdir_size);
 307
 308                 hp->gatt = &hp->io_pdir[HP_ZX1_IOVA_TO_PDIR(hp->gart_base)];
 309         }
 310
 311         for (i = 0; i < hp->gatt_entries; i++) {
 312                 hp->gatt[i] = (unsigned long) agp_bridge->scratch_page;
 313         }
 314
 315         return 0;
 316 }
 317
 318 static int
 319 hp_zx1_free_gatt_table (struct agp_bridge_data *bridge)
 320 {
 321         struct _hp_private *hp = &hp_private;
 322
 323         if (hp->io_pdir_owner)
 324                 free_pages((unsigned long) hp->io_pdir,
 325                             get_order(hp->io_pdir_size));
 326         else
 327                 hp->gatt[0] = HP_ZX1_SBA_IOMMU_COOKIE;
 328         return 0;
 329 }
 330
 331 static int
 332 hp_zx1_insert_memory (struct agp_memory *mem, off_t pg_start, int type)
 333 {
 334         struct _hp_private *hp = &hp_private;
 335         int i, k;
 336         off_t j, io_pg_start;
 337         int io_pg_count;
 338
 339         if (type != 0 || mem->type != 0) {
 340                 return -EINVAL;
 341         }
 342
 343         io_pg_start = hp->io_pages_per_kpage * pg_start;
 344         io_pg_count = hp->io_pages_per_kpage * mem->page_count;
 345         if ((io_pg_start + io_pg_count) > hp->gatt_entries) {
 346                 return -EINVAL;
 347         }
 348
 349         j = io_pg_start;
 350         while (j < (io_pg_start + io_pg_count)) {
 351                 if (hp->gatt[j]) {
 352                         return -EBUSY;
 353                 }
 354                 j++;
 355         }
 356
 357         if (!mem->is_flushed) {
 358                 global_cache_flush();
 359                 mem->is_flushed = true;
 360         }
 361
 362         for (i = 0, j = io_pg_start; i < mem->page_count; i++) {
 363                 unsigned long paddr;
 364
 365                 paddr = page_to_phys(mem->pages[i]);
 366                 for (k = 0;
 367                      k < hp->io_pages_per_kpage;
 368                      k++, j++, paddr += hp->io_page_size) {
 369                         hp->gatt[j] = HP_ZX1_PDIR_VALID_BIT | paddr;
 370                 }
 371         }
 372
 373         agp_bridge->driver->tlb_flush(mem);
 374         return 0;
 375 }
 376
 377 static int
 378 hp_zx1_remove_memory (struct agp_memory *mem, off_t pg_start, int type)
 379 {
 380         struct _hp_private *hp = &hp_private;
 381         int i, io_pg_start, io_pg_count;
 382
 383         if (type != 0 || mem->type != 0) {
 384                 return -EINVAL;
 385         }
 386
 387         io_pg_start = hp->io_pages_per_kpage * pg_start;
 388         io_pg_count = hp->io_pages_per_kpage * mem->page_count;
 389         for (i = io_pg_start; i < io_pg_count + io_pg_start; i++) {
 390                 hp->gatt[i] = agp_bridge->scratch_page;
 391         }
 392
 393         agp_bridge->driver->tlb_flush(mem);
 394         return 0;
 395 }
 396
 397 static unsigned long
 398 hp_zx1_mask_memory (struct agp_bridge_data *bridge, dma_addr_t addr, int type)
 399 {
 400         return HP_ZX1_PDIR_VALID_BIT | addr;
 401 }
 402
 403 static void
 404 hp_zx1_enable (struct agp_bridge_data *bridge, u32 mode)
 405 {
 406         struct _hp_private *hp = &hp_private;
 407         u32 command;
 408
 409         command = readl(hp->lba_regs+hp->lba_cap_offset+PCI_AGP_STATUS);
 410         command = agp_collect_device_status(bridge, mode, command);
 411         command |= 0x00000100;
 412
 413         writel(command, hp->lba_regs+hp->lba_cap_offset+PCI_AGP_COMMAND);
 414
 415         agp_device_command(command, (mode & AGP8X_MODE) != 0);
 416 }
 417
 418 const struct agp_bridge_driver hp_zx1_driver = {
 419         .owner                  = THIS_MODULE,
 420         .size_type              = FIXED_APER_SIZE,
 421         .configure              = hp_zx1_configure,
 422         .fetch_size             = hp_zx1_fetch_size,
 423         .cleanup                = hp_zx1_cleanup,
 424         .tlb_flush              = hp_zx1_tlbflush,
 425         .mask_memory            = hp_zx1_mask_memory,
 426         .masks                  = hp_zx1_masks,
 427         .agp_enable             = hp_zx1_enable,
 428         .cache_flush            = global_cache_flush,
 429         .create_gatt_table      = hp_zx1_create_gatt_table,
 430         .free_gatt_table        = hp_zx1_free_gatt_table,
 431         .insert_memory          = hp_zx1_insert_memory,
 432         .remove_memory          = hp_zx1_remove_memory,
 433         .alloc_by_type          = agp_generic_alloc_by_type,
 434         .free_by_type           = agp_generic_free_by_type,
 435         .agp_alloc_page         = agp_generic_alloc_page,
 436         .agp_alloc_pages        = agp_generic_alloc_pages,
 437         .agp_destroy_page       = agp_generic_destroy_page,
 438         .agp_destroy_pages      = agp_generic_destroy_pages,
 439         .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
 440         .cant_use_aperture      = true,
 441 };
 442
 443 static int __init
 444 hp_zx1_setup (u64 ioc_hpa, u64 lba_hpa)
 445 {
 446         struct agp_bridge_data *bridge;
 447         int error = 0;
 448
 449         error = hp_zx1_ioc_init(ioc_hpa);
 450         if (error)
 451                 goto fail;
 452
 453         error = hp_zx1_lba_init(lba_hpa);
 454         if (error)
 455                 goto fail;
 456
 457         bridge = agp_alloc_bridge();
 458         if (!bridge) {
 459                 error = -ENOMEM;
 460                 goto fail;
 461         }
 462         bridge->driver = &hp_zx1_driver;
 463
 464         fake_bridge_dev.vendor = PCI_VENDOR_ID_HP;
 465         fake_bridge_dev.device = PCI_DEVICE_ID_HP_PCIX_LBA;
 466         bridge->dev = &fake_bridge_dev;
 467
 468         error = agp_add_bridge(bridge);
 469   fail:
 470         if (error)
 471                 hp_zx1_cleanup();
 472         return error;
 473 }
 474
 475 static acpi_status __init
 476 zx1_gart_probe (acpi_handle obj, u32 depth, void *context, void **ret)
 477 {
 478         acpi_handle handle, parent;
 479         acpi_status status;
 480         struct acpi_device_info *info;
 481         u64 lba_hpa, sba_hpa, length;
 482         int match;
 483
 484         status = hp_acpi_csr_space(obj, &lba_hpa, &length);
 485         if (ACPI_FAILURE(status))
 486                 return AE_OK; /* keep looking for another bridge */
 487
 488         /* Look for an enclosing IOC scope and find its CSR space */
 489         handle = obj;
 490         do {
 491                 status = acpi_get_object_info(handle, &info);
 492                 if (ACPI_SUCCESS(status) && (info->valid & ACPI_VALID_HID)) {
 493                         /* TBD check _CID also */
 494                         match = (strcmp(info->hardware_id.string, "HWP0001") == 0);
 495                         kfree(info);
 496                         if (match) {
 497                                 status = hp_acpi_csr_space(handle, &sba_hpa, &length);
 498                                 if (ACPI_SUCCESS(status))
 499                                         break;
 500                                 else {
 501                                         printk(KERN_ERR PFX "Detected HP ZX1 "
 502                                                "AGP LBA but no IOC.\n");
 503                                         return AE_OK;
 504                                 }
 505                         }
 506                 }
 507
 508                 status = acpi_get_parent(handle, &parent);
 509                 handle = parent;
 510         } while (ACPI_SUCCESS(status));
 511
 512         if (ACPI_FAILURE(status))
 513                 return AE_OK;   /* found no enclosing IOC */
 514
 515         if (hp_zx1_setup(sba_hpa + HP_ZX1_IOC_OFFSET, lba_hpa))
 516                 return AE_OK;
 517
 518         printk(KERN_INFO PFX "Detected HP ZX1 %s AGP chipset "
 519                 "(ioc=%llx, lba=%llx)\n", (char *)context,
 520                 sba_hpa + HP_ZX1_IOC_OFFSET, lba_hpa);
 521
 522         hp_zx1_gart_found = 1;
 523         return AE_CTRL_TERMINATE; /* we only support one bridge; quit looking */
 524 }
 525
 526 static int __init
 527 agp_hp_init (void)
 528 {
 529         if (agp_off)
 530                 return -EINVAL;
 531
 532         acpi_get_devices("HWP0003", zx1_gart_probe, "HWP0003", NULL);
 533         if (hp_zx1_gart_found)
 534                 return 0;
 535
 536         acpi_get_devices("HWP0007", zx1_gart_probe, "HWP0007", NULL);
 537         if (hp_zx1_gart_found)
 538                 return 0;
 539
 540         return -ENODEV;
 541 }
 542
 543 static void __exit
 544 agp_hp_cleanup (void)
 545 {
 546 }
 547
 548 module_init(agp_hp_init);
 549 module_exit(agp_hp_cleanup);
 550
 551 MODULE_LICENSE("GPL and additional rights");