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