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ati-agp.c

/*
 * ATi AGPGART routines.
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/agp_backend.h>
#include <asm/agp.h>
#include "agp.h"

#define ATI_GART_MMBASE_ADDR  0x14
#define ATI_RS100_APSIZE      0xac
#define ATI_RS100_IG_AGPMODE  0xb0
#define ATI_RS300_APSIZE      0xf8
#define ATI_RS300_IG_AGPMODE  0xfc
#define ATI_GART_FEATURE_ID         0x00
#define ATI_GART_BASE               0x04
#define ATI_GART_CACHE_SZBASE       0x08
#define ATI_GART_CACHE_CNTRL        0x0c
#define ATI_GART_CACHE_ENTRY_CNTRL  0x10


static const struct aper_size_info_lvl2 ati_generic_sizes[7] =
{
      {2048, 524288, 0x0000000c},
      {1024, 262144, 0x0000000a},
      {512, 131072, 0x00000008},
      {256, 65536, 0x00000006},
      {128, 32768, 0x00000004},
      {64, 16384, 0x00000002},
      {32, 8192, 0x00000000}
};

static struct gatt_mask ati_generic_masks[] =
{
      { .mask = 1, .type = 0}
};


struct ati_page_map {
      unsigned long *real;
      unsigned long __iomem *remapped;
};

static struct _ati_generic_private {
      volatile u8 __iomem *registers;
      struct ati_page_map **gatt_pages;
      int num_tables;
} ati_generic_private;

static int ati_create_page_map(struct ati_page_map *page_map)
{
      int i, err = 0;

      page_map->real = (unsigned long *) __get_free_page(GFP_KERNEL);
      if (page_map->real == NULL)
            return -ENOMEM;

      SetPageReserved(virt_to_page(page_map->real));
      err = map_page_into_agp(virt_to_page(page_map->real));
      page_map->remapped = ioremap_nocache(virt_to_gart(page_map->real),
                                  PAGE_SIZE);
      if (page_map->remapped == NULL || err) {
            ClearPageReserved(virt_to_page(page_map->real));
            free_page((unsigned long) page_map->real);
            page_map->real = NULL;
            return -ENOMEM;
      }
      /*CACHE_FLUSH();*/
      global_cache_flush();

      for (i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++) {
            writel(agp_bridge->scratch_page, page_map->remapped+i);
            readl(page_map->remapped+i);  /* PCI Posting. */
      }

      return 0;
}


static void ati_free_page_map(struct ati_page_map *page_map)
{
      unmap_page_from_agp(virt_to_page(page_map->real));
      iounmap(page_map->remapped);
      ClearPageReserved(virt_to_page(page_map->real));
      free_page((unsigned long) page_map->real);
}


static void ati_free_gatt_pages(void)
{
      int i;
      struct ati_page_map **tables;
      struct ati_page_map *entry;

      tables = ati_generic_private.gatt_pages;
      for (i = 0; i < ati_generic_private.num_tables; i++) {
            entry = tables[i];
            if (entry != NULL) {
                  if (entry->real != NULL)
                        ati_free_page_map(entry);
                  kfree(entry);
            }
      }
      kfree(tables);
}


static int ati_create_gatt_pages(int nr_tables)
{
      struct ati_page_map **tables;
      struct ati_page_map *entry;
      int retval = 0;
      int i;

      tables = kzalloc((nr_tables + 1) * sizeof(struct ati_page_map *),GFP_KERNEL);
      if (tables == NULL)
            return -ENOMEM;

      for (i = 0; i < nr_tables; i++) {
            entry = kzalloc(sizeof(struct ati_page_map), GFP_KERNEL);
            tables[i] = entry;
            if (entry == NULL) {
                  retval = -ENOMEM;
                  break;
            }
            retval = ati_create_page_map(entry);
            if (retval != 0)
                  break;
      }
      ati_generic_private.num_tables = i;
      ati_generic_private.gatt_pages = tables;

      if (retval != 0)
            ati_free_gatt_pages();

      return retval;
}

static int is_r200(void)
{
      if ((agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS100) ||
          (agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS200) ||
          (agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS200_B) ||
          (agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS250))
            return 1;
      return 0;
}

static int ati_fetch_size(void)
{
      int i;
      u32 temp;
      struct aper_size_info_lvl2 *values;

      if (is_r200())
            pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
      else
            pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);

      temp = (temp & 0x0000000e);
      values = A_SIZE_LVL2(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 ati_tlbflush(struct agp_memory * mem)
{
      writel(1, ati_generic_private.registers+ATI_GART_CACHE_CNTRL);
      readl(ati_generic_private.registers+ATI_GART_CACHE_CNTRL);  /* PCI Posting. */
}

static void ati_cleanup(void)
{
      struct aper_size_info_lvl2 *previous_size;
      u32 temp;

      previous_size = A_SIZE_LVL2(agp_bridge->previous_size);

      /* Write back the previous size and disable gart translation */
      if (is_r200()) {
            pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
            temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
            pci_write_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, temp);
      } else {
            pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
            temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
            pci_write_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, temp);
      }
      iounmap((volatile u8 __iomem *)ati_generic_private.registers);
}


static int ati_configure(void)
{
      u32 temp;

      /* Get the memory mapped registers */
      pci_read_config_dword(agp_bridge->dev, ATI_GART_MMBASE_ADDR, &temp);
      temp = (temp & 0xfffff000);
      ati_generic_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);

      if (!ati_generic_private.registers)
            return -ENOMEM;

      if (is_r200())
            pci_write_config_dword(agp_bridge->dev, ATI_RS100_IG_AGPMODE, 0x20000);
      else
            pci_write_config_dword(agp_bridge->dev, ATI_RS300_IG_AGPMODE, 0x20000);

      /* address to map too */
      /*
      pci_read_config_dword(agp_bridge.dev, AGP_APBASE, &temp);
      agp_bridge.gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
      printk(KERN_INFO PFX "IGP320 gart_bus_addr: %x\n", agp_bridge.gart_bus_addr);
      */
      writel(0x60000, ati_generic_private.registers+ATI_GART_FEATURE_ID);
      readl(ati_generic_private.registers+ATI_GART_FEATURE_ID);   /* PCI Posting.*/

      /* SIGNALED_SYSTEM_ERROR @ NB_STATUS */
      pci_read_config_dword(agp_bridge->dev, 4, &temp);
      pci_write_config_dword(agp_bridge->dev, 4, temp | (1<<14));

      /* Write out the address of the gatt table */
      writel(agp_bridge->gatt_bus_addr, ati_generic_private.registers+ATI_GART_BASE);
      readl(ati_generic_private.registers+ATI_GART_BASE);   /* PCI Posting. */

      return 0;
}


#ifdef CONFIG_PM
static int agp_ati_suspend(struct pci_dev *dev, pm_message_t state)
{
      pci_save_state(dev);
      pci_set_power_state(dev, 3);

      return 0;
}

static int agp_ati_resume(struct pci_dev *dev)
{
      pci_set_power_state(dev, 0);
      pci_restore_state(dev);

      return ati_configure();
}
#endif

/*
 *Since we don't need contiguous memory we just try
 * to get the gatt table once
 */

#define GET_PAGE_DIR_OFF(addr) (addr >> 22)
#define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr) - \
      GET_PAGE_DIR_OFF(agp_bridge->gart_bus_addr))
#define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)
#undef  GET_GATT
#define GET_GATT(addr) (ati_generic_private.gatt_pages[\
      GET_PAGE_DIR_IDX(addr)]->remapped)

static int ati_insert_memory(struct agp_memory * mem,
                       off_t pg_start, int type)
{
      int i, j, num_entries;
      unsigned long __iomem *cur_gatt;
      unsigned long addr;

      num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;

      if (type != 0 || mem->type != 0)
            return -EINVAL;

      if ((pg_start + mem->page_count) > num_entries)
            return -EINVAL;

      j = pg_start;
      while (j < (pg_start + mem->page_count)) {
            addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
            cur_gatt = GET_GATT(addr);
            if (!PGE_EMPTY(agp_bridge,readl(cur_gatt+GET_GATT_OFF(addr))))
                  return -EBUSY;
            j++;
      }

      if (mem->is_flushed == FALSE) {
            /*CACHE_FLUSH(); */
            global_cache_flush();
            mem->is_flushed = TRUE;
      }

      for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
            addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
            cur_gatt = GET_GATT(addr);
            writel(agp_bridge->driver->mask_memory(agp_bridge,
                  mem->memory[i], mem->type), cur_gatt+GET_GATT_OFF(addr));
            readl(cur_gatt+GET_GATT_OFF(addr)); /* PCI Posting. */
      }
      agp_bridge->driver->tlb_flush(mem);
      return 0;
}

static int ati_remove_memory(struct agp_memory * mem, off_t pg_start,
                       int type)
{
      int i;
      unsigned long __iomem *cur_gatt;
      unsigned long addr;

      if (type != 0 || mem->type != 0)
            return -EINVAL;

      for (i = pg_start; i < (mem->page_count + pg_start); i++) {
            addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
            cur_gatt = GET_GATT(addr);
            writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
            readl(cur_gatt+GET_GATT_OFF(addr)); /* PCI Posting. */
      }

      agp_bridge->driver->tlb_flush(mem);
      return 0;
}

static int ati_create_gatt_table(struct agp_bridge_data *bridge)
{
      struct aper_size_info_lvl2 *value;
      struct ati_page_map page_dir;
      unsigned long addr;
      int retval;
      u32 temp;
      int i;
      struct aper_size_info_lvl2 *current_size;

      value = A_SIZE_LVL2(agp_bridge->current_size);
      retval = ati_create_page_map(&page_dir);
      if (retval != 0)
            return retval;

      retval = ati_create_gatt_pages(value->num_entries / 1024);
      if (retval != 0) {
            ati_free_page_map(&page_dir);
            return retval;
      }

      agp_bridge->gatt_table_real = (u32 *)page_dir.real;
      agp_bridge->gatt_table = (u32 __iomem *) page_dir.remapped;
      agp_bridge->gatt_bus_addr = virt_to_gart(page_dir.real);

      /* Write out the size register */
      current_size = A_SIZE_LVL2(agp_bridge->current_size);

      if (is_r200()) {
            pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
            temp = (((temp & ~(0x0000000e)) | current_size->size_value)
                  | 0x00000001);
            pci_write_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, temp);
            pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
      } else {
            pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
            temp = (((temp & ~(0x0000000e)) | current_size->size_value)
                  | 0x00000001);
            pci_write_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, temp);
            pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
      }

      /*
       * Get the address for the gart region.
       * This is a bus address even on the alpha, b/c its
       * used to program the agp master not the cpu
       */
      pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
      addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
      agp_bridge->gart_bus_addr = addr;

      /* Calculate the agp offset */
      for (i = 0; i < value->num_entries / 1024; i++, addr += 0x00400000) {
            writel(virt_to_gart(ati_generic_private.gatt_pages[i]->real) | 1,
                  page_dir.remapped+GET_PAGE_DIR_OFF(addr));
            readl(page_dir.remapped+GET_PAGE_DIR_OFF(addr));      /* PCI Posting. */
      }

      return 0;
}

static int ati_free_gatt_table(struct agp_bridge_data *bridge)
{
      struct ati_page_map page_dir;

      page_dir.real = (unsigned long *)agp_bridge->gatt_table_real;
      page_dir.remapped = (unsigned long __iomem *)agp_bridge->gatt_table;

      ati_free_gatt_pages();
      ati_free_page_map(&page_dir);
      return 0;
}

static const struct agp_bridge_driver ati_generic_bridge = {
      .owner                  = THIS_MODULE,
      .aperture_sizes         = ati_generic_sizes,
      .size_type        = LVL2_APER_SIZE,
      .num_aperture_sizes     = 7,
      .configure        = ati_configure,
      .fetch_size       = ati_fetch_size,
      .cleanup          = ati_cleanup,
      .tlb_flush        = ati_tlbflush,
      .mask_memory            = agp_generic_mask_memory,
      .masks                  = ati_generic_masks,
      .agp_enable       = agp_generic_enable,
      .cache_flush            = global_cache_flush,
      .create_gatt_table      = ati_create_gatt_table,
      .free_gatt_table  = ati_free_gatt_table,
      .insert_memory          = ati_insert_memory,
      .remove_memory          = ati_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 = agp_generic_destroy_page,
      .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
};


static struct agp_device_ids ati_agp_device_ids[] __devinitdata =
{
      {
            .device_id  = PCI_DEVICE_ID_ATI_RS100,
            .chipset_name     = "IGP320/M",
      },
      {
            .device_id  = PCI_DEVICE_ID_ATI_RS200,
            .chipset_name     = "IGP330/340/345/350/M",
      },
      {
            .device_id  = PCI_DEVICE_ID_ATI_RS200_B,
            .chipset_name     = "IGP345M",
      },
      {
            .device_id  = PCI_DEVICE_ID_ATI_RS250,
            .chipset_name     = "IGP7000/M",
      },
      {
            .device_id  = PCI_DEVICE_ID_ATI_RS300_100,
            .chipset_name     = "IGP9100/M",
      },
      {
            .device_id  = PCI_DEVICE_ID_ATI_RS300_133,
            .chipset_name     = "IGP9100/M",
      },
      {
            .device_id  = PCI_DEVICE_ID_ATI_RS300_166,
            .chipset_name     = "IGP9100/M",
      },
      {
            .device_id  = PCI_DEVICE_ID_ATI_RS300_200,
            .chipset_name     = "IGP9100/M",
      },
      {
            .device_id  = PCI_DEVICE_ID_ATI_RS350_200,
            .chipset_name     = "IGP9100/M",
      },
      { }, /* dummy final entry, always present */
};

static int __devinit agp_ati_probe(struct pci_dev *pdev,
                           const struct pci_device_id *ent)
{
      struct agp_device_ids *devs = ati_agp_device_ids;
      struct agp_bridge_data *bridge;
      u8 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 Ati 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;

      bridge->driver = &ati_generic_bridge;

      printk(KERN_INFO PFX "Detected Ati %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_ati_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_ati_pci_table[] = {
      {
      .class            = (PCI_CLASS_BRIDGE_HOST << 8),
      .class_mask = ~0,
      .vendor           = PCI_VENDOR_ID_ATI,
      .device           = PCI_ANY_ID,
      .subvendor  = PCI_ANY_ID,
      .subdevice  = PCI_ANY_ID,
      },
      { }
};

MODULE_DEVICE_TABLE(pci, agp_ati_pci_table);

static struct pci_driver agp_ati_pci_driver = {
      .name       = "agpgart-ati",
      .id_table   = agp_ati_pci_table,
      .probe            = agp_ati_probe,
      .remove           = agp_ati_remove,
#ifdef CONFIG_PM
      .suspend    = agp_ati_suspend,
      .resume           = agp_ati_resume,
#endif
};

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

static void __exit agp_ati_cleanup(void)
{
      pci_unregister_driver(&agp_ati_pci_driver);
}

module_init(agp_ati_init);
module_exit(agp_ati_cleanup);

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


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