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ali-agp.c

/*
 * ALi AGPGART routines.
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/agp_backend.h>
#include <asm/page.h>         /* PAGE_SIZE */
#include "agp.h"

#define ALI_AGPCTRL     0xb8
#define ALI_ATTBASE     0xbc
#define ALI_TLBCTRL     0xc0
#define ALI_TAGCTRL     0xc4
#define ALI_CACHE_FLUSH_CTRL  0xD0
#define ALI_CACHE_FLUSH_ADDR_MASK   0xFFFFF000
#define ALI_CACHE_FLUSH_EN    0x100

static int ali_fetch_size(void)
{
      int i;
      u32 temp;
      struct aper_size_info_32 *values;

      pci_read_config_dword(agp_bridge->dev, ALI_ATTBASE, &temp);
      temp &= ~(0xfffffff0);
      values = A_SIZE_32(agp_bridge->driver->aperture_sizes);

      for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
            if (temp == values[i].size_value) {
                  agp_bridge->previous_size =
                      agp_bridge->current_size = (void *) (values + i);
                  agp_bridge->aperture_size_idx = i;
                  return values[i].size;
            }
      }

      return 0;
}

static void ali_tlbflush(struct agp_memory *mem)
{
      u32 temp;

      pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
      temp &= 0xfffffff0;
      temp |= (1<<0 | 1<<1);
      pci_write_config_dword(agp_bridge->dev, ALI_TAGCTRL, temp);
}

static void ali_cleanup(void)
{
      struct aper_size_info_32 *previous_size;
      u32 temp;

      previous_size = A_SIZE_32(agp_bridge->previous_size);

      pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
// clear tag
      pci_write_config_dword(agp_bridge->dev, ALI_TAGCTRL,
                  ((temp & 0xffffff00) | 0x00000001|0x00000002));

      pci_read_config_dword(agp_bridge->dev,  ALI_ATTBASE, &temp);
      pci_write_config_dword(agp_bridge->dev, ALI_ATTBASE,
                  ((temp & 0x00000ff0) | previous_size->size_value));
}

static int ali_configure(void)
{
      u32 temp;
      struct aper_size_info_32 *current_size;

      current_size = A_SIZE_32(agp_bridge->current_size);

      /* aperture size and gatt addr */
      pci_read_config_dword(agp_bridge->dev, ALI_ATTBASE, &temp);
      temp = (((temp & 0x00000ff0) | (agp_bridge->gatt_bus_addr & 0xfffff000))
                  | (current_size->size_value & 0xf));
      pci_write_config_dword(agp_bridge->dev, ALI_ATTBASE, temp);

      /* tlb control */
      pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
      pci_write_config_dword(agp_bridge->dev, ALI_TLBCTRL, ((temp & 0xffffff00) | 0x00000010));

      /* address to map to */
      pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
      agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);

#if 0
      if (agp_bridge->type == ALI_M1541) {
            u32 nlvm_addr = 0;

            switch (current_size->size_value) {
                  case 0:  break;
                  case 1:  nlvm_addr = 0x100000;break;
                  case 2:  nlvm_addr = 0x200000;break;
                  case 3:  nlvm_addr = 0x400000;break;
                  case 4:  nlvm_addr = 0x800000;break;
                  case 6:  nlvm_addr = 0x1000000;break;
                  case 7:  nlvm_addr = 0x2000000;break;
                  case 8:  nlvm_addr = 0x4000000;break;
                  case 9:  nlvm_addr = 0x8000000;break;
                  case 10: nlvm_addr = 0x10000000;break;
                  default: break;
            }
            nlvm_addr--;
            nlvm_addr&=0xfff00000;

            nlvm_addr+= agp_bridge->gart_bus_addr;
            nlvm_addr|=(agp_bridge->gart_bus_addr>>12);
            printk(KERN_INFO PFX "nlvm top &base = %8x\n",nlvm_addr);
      }
#endif

      pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
      temp &= 0xffffff7f;           //enable TLB
      pci_write_config_dword(agp_bridge->dev, ALI_TLBCTRL, temp);

      return 0;
}


static void m1541_cache_flush(void)
{
      int i, page_count;
      u32 temp;

      global_cache_flush();

      page_count = 1 << A_SIZE_32(agp_bridge->current_size)->page_order;
      for (i = 0; i < PAGE_SIZE * page_count; i += PAGE_SIZE) {
            pci_read_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
                        &temp);
            pci_write_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
                        (((temp & ALI_CACHE_FLUSH_ADDR_MASK) |
                          (agp_bridge->gatt_bus_addr + i)) |
                         ALI_CACHE_FLUSH_EN));
      }
}

static void *m1541_alloc_page(struct agp_bridge_data *bridge)
{
      void *addr = agp_generic_alloc_page(agp_bridge);
      u32 temp;

      global_flush_tlb();
      if (!addr)
            return NULL;

      pci_read_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL, &temp);
      pci_write_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
                  (((temp & ALI_CACHE_FLUSH_ADDR_MASK) |
                    virt_to_gart(addr)) | ALI_CACHE_FLUSH_EN ));
      return addr;
}

static void ali_destroy_page(void * addr, int flags)
{
      if (addr) {
            if (flags & AGP_PAGE_DESTROY_UNMAP) {
                  global_cache_flush();   /* is this really needed?  --hch */
                  agp_generic_destroy_page(addr, flags);
                  global_flush_tlb();
            } else
                  agp_generic_destroy_page(addr, flags);
      }
}

static void m1541_destroy_page(void * addr, int flags)
{
      u32 temp;

      if (addr == NULL)
            return;

      if (flags & AGP_PAGE_DESTROY_UNMAP) {
            global_cache_flush();

            pci_read_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL, &temp);
            pci_write_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
                               (((temp & ALI_CACHE_FLUSH_ADDR_MASK) |
                               virt_to_gart(addr)) | ALI_CACHE_FLUSH_EN));
      }
      agp_generic_destroy_page(addr, flags);
}


/* Setup function */

static const struct aper_size_info_32 ali_generic_sizes[7] =
{
      {256, 65536, 6, 10},
      {128, 32768, 5, 9},
      {64, 16384, 4, 8},
      {32, 8192, 3, 7},
      {16, 4096, 2, 6},
      {8, 2048, 1, 4},
      {4, 1024, 0, 3}
};

static const struct agp_bridge_driver ali_generic_bridge = {
      .owner                  = THIS_MODULE,
      .aperture_sizes         = ali_generic_sizes,
      .size_type        = U32_APER_SIZE,
      .num_aperture_sizes     = 7,
      .configure        = ali_configure,
      .fetch_size       = ali_fetch_size,
      .cleanup          = ali_cleanup,
      .tlb_flush        = ali_tlbflush,
      .mask_memory            = agp_generic_mask_memory,
      .masks                  = NULL,
      .agp_enable       = agp_generic_enable,
      .cache_flush            = global_cache_flush,
      .create_gatt_table      = agp_generic_create_gatt_table,
      .free_gatt_table  = agp_generic_free_gatt_table,
      .insert_memory          = agp_generic_insert_memory,
      .remove_memory          = agp_generic_remove_memory,
      .alloc_by_type          = agp_generic_alloc_by_type,
      .free_by_type           = agp_generic_free_by_type,
      .agp_alloc_page         = agp_generic_alloc_page,
      .agp_destroy_page = ali_destroy_page,
      .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
};

static const struct agp_bridge_driver ali_m1541_bridge = {
      .owner                  = THIS_MODULE,
      .aperture_sizes         = ali_generic_sizes,
      .size_type        = U32_APER_SIZE,
      .num_aperture_sizes     = 7,
      .configure        = ali_configure,
      .fetch_size       = ali_fetch_size,
      .cleanup          = ali_cleanup,
      .tlb_flush        = ali_tlbflush,
      .mask_memory            = agp_generic_mask_memory,
      .masks                  = NULL,
      .agp_enable       = agp_generic_enable,
      .cache_flush            = m1541_cache_flush,
      .create_gatt_table      = agp_generic_create_gatt_table,
      .free_gatt_table  = agp_generic_free_gatt_table,
      .insert_memory          = agp_generic_insert_memory,
      .remove_memory          = agp_generic_remove_memory,
      .alloc_by_type          = agp_generic_alloc_by_type,
      .free_by_type           = agp_generic_free_by_type,
      .agp_alloc_page         = m1541_alloc_page,
      .agp_destroy_page = m1541_destroy_page,
      .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
};


static struct agp_device_ids ali_agp_device_ids[] __devinitdata =
{
      {
            .device_id  = PCI_DEVICE_ID_AL_M1541,
            .chipset_name     = "M1541",
      },
      {
            .device_id  = PCI_DEVICE_ID_AL_M1621,
            .chipset_name     = "M1621",
      },
      {
            .device_id  = PCI_DEVICE_ID_AL_M1631,
            .chipset_name     = "M1631",
      },
      {
            .device_id  = PCI_DEVICE_ID_AL_M1632,
            .chipset_name     = "M1632",
      },
      {
            .device_id  = PCI_DEVICE_ID_AL_M1641,
            .chipset_name     = "M1641",
      },
      {
            .device_id  = PCI_DEVICE_ID_AL_M1644,
            .chipset_name     = "M1644",
      },
      {
            .device_id  = PCI_DEVICE_ID_AL_M1647,
            .chipset_name     = "M1647",
      },
      {
            .device_id  = PCI_DEVICE_ID_AL_M1651,
            .chipset_name     = "M1651",
      },
      {
            .device_id  = PCI_DEVICE_ID_AL_M1671,
            .chipset_name     = "M1671",
      },
      {
            .device_id  = PCI_DEVICE_ID_AL_M1681,
            .chipset_name     = "M1681",
      },
      {
            .device_id  = PCI_DEVICE_ID_AL_M1683,
            .chipset_name     = "M1683",
      },

      { }, /* dummy final entry, always present */
};

static int __devinit agp_ali_probe(struct pci_dev *pdev,
                        const struct pci_device_id *ent)
{
      struct agp_device_ids *devs = ali_agp_device_ids;
      struct agp_bridge_data *bridge;
      u8 hidden_1621_id, cap_ptr;
      int j;

      cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
      if (!cap_ptr)
            return -ENODEV;

      /* probe for known chipsets */
      for (j = 0; devs[j].chipset_name; j++) {
            if (pdev->device == devs[j].device_id)
                  goto found;
      }

      printk(KERN_ERR PFX "Unsupported ALi chipset (device id: %04x)\n",
           pdev->device);
      return -ENODEV;


found:
      bridge = agp_alloc_bridge();
      if (!bridge)
            return -ENOMEM;

      bridge->dev = pdev;
      bridge->capndx = cap_ptr;

      switch (pdev->device) {
      case PCI_DEVICE_ID_AL_M1541:
            bridge->driver = &ali_m1541_bridge;
            break;
      case PCI_DEVICE_ID_AL_M1621:
            pci_read_config_byte(pdev, 0xFB, &hidden_1621_id);
            switch (hidden_1621_id) {
            case 0x31:
                  devs[j].chipset_name = "M1631";
                  break;
            case 0x32:
                  devs[j].chipset_name = "M1632";
                  break;
            case 0x41:
                  devs[j].chipset_name = "M1641";
                  break;
            case 0x43:
                  devs[j].chipset_name = "M????";
                  break;
            case 0x47:
                  devs[j].chipset_name = "M1647";
                  break;
            case 0x51:
                  devs[j].chipset_name = "M1651";
                  break;
            default:
                  break;
            }
            /*FALLTHROUGH*/
      default:
            bridge->driver = &ali_generic_bridge;
      }

      printk(KERN_INFO PFX "Detected ALi %s chipset\n",
                  devs[j].chipset_name);

      /* Fill in the mode register */
      pci_read_config_dword(pdev,
                  bridge->capndx+PCI_AGP_STATUS,
                  &bridge->mode);

      pci_set_drvdata(pdev, bridge);
      return agp_add_bridge(bridge);
}

static void __devexit agp_ali_remove(struct pci_dev *pdev)
{
      struct agp_bridge_data *bridge = pci_get_drvdata(pdev);

      agp_remove_bridge(bridge);
      agp_put_bridge(bridge);
}

static struct pci_device_id agp_ali_pci_table[] = {
      {
      .class            = (PCI_CLASS_BRIDGE_HOST << 8),
      .class_mask = ~0,
      .vendor           = PCI_VENDOR_ID_AL,
      .device           = PCI_ANY_ID,
      .subvendor  = PCI_ANY_ID,
      .subdevice  = PCI_ANY_ID,
      },
      { }
};

MODULE_DEVICE_TABLE(pci, agp_ali_pci_table);

static struct pci_driver agp_ali_pci_driver = {
      .name       = "agpgart-ali",
      .id_table   = agp_ali_pci_table,
      .probe            = agp_ali_probe,
      .remove           = agp_ali_remove,
};

static int __init agp_ali_init(void)
{
      if (agp_off)
            return -EINVAL;
      return pci_register_driver(&agp_ali_pci_driver);
}

static void __exit agp_ali_cleanup(void)
{
      pci_unregister_driver(&agp_ali_pci_driver);
}

module_init(agp_ali_init);
module_exit(agp_ali_cleanup);

MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>");
MODULE_LICENSE("GPL and additional rights");


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