/*
 * Intel AGPGART routines.
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/pagemap.h>
#include <linux/agp_backend.h>
#include "agp.h"

#define PCI_DEVICE_ID_INTEL_E7221_HB    0x2588
#define PCI_DEVICE_ID_INTEL_E7221_IG    0x258a
#define PCI_DEVICE_ID_INTEL_82946GZ_HB      0x2970
#define PCI_DEVICE_ID_INTEL_82946GZ_IG      0x2972
#define PCI_DEVICE_ID_INTEL_82G35_HB     0x2980
#define PCI_DEVICE_ID_INTEL_82G35_IG     0x2982
#define PCI_DEVICE_ID_INTEL_82965Q_HB       0x2990
#define PCI_DEVICE_ID_INTEL_82965Q_IG       0x2992
#define PCI_DEVICE_ID_INTEL_82965G_HB       0x29A0
#define PCI_DEVICE_ID_INTEL_82965G_IG       0x29A2
#define PCI_DEVICE_ID_INTEL_82965GM_HB      0x2A00
#define PCI_DEVICE_ID_INTEL_82965GM_IG      0x2A02
#define PCI_DEVICE_ID_INTEL_82965GME_HB     0x2A10
#define PCI_DEVICE_ID_INTEL_82965GME_IG     0x2A12
#define PCI_DEVICE_ID_INTEL_82945GME_HB     0x27AC
#define PCI_DEVICE_ID_INTEL_82945GME_IG     0x27AE
#define PCI_DEVICE_ID_INTEL_IGDGM_HB        0xA010
#define PCI_DEVICE_ID_INTEL_IGDGM_IG        0xA011
#define PCI_DEVICE_ID_INTEL_IGDG_HB         0xA000
#define PCI_DEVICE_ID_INTEL_IGDG_IG         0xA001
#define PCI_DEVICE_ID_INTEL_G33_HB          0x29C0
#define PCI_DEVICE_ID_INTEL_G33_IG          0x29C2
#define PCI_DEVICE_ID_INTEL_Q35_HB          0x29B0
#define PCI_DEVICE_ID_INTEL_Q35_IG          0x29B2
#define PCI_DEVICE_ID_INTEL_Q33_HB          0x29D0
#define PCI_DEVICE_ID_INTEL_Q33_IG          0x29D2
#define PCI_DEVICE_ID_INTEL_GM45_HB         0x2A40
#define PCI_DEVICE_ID_INTEL_GM45_IG         0x2A42
#define PCI_DEVICE_ID_INTEL_IGD_E_HB        0x2E00
#define PCI_DEVICE_ID_INTEL_IGD_E_IG        0x2E02
#define PCI_DEVICE_ID_INTEL_Q45_HB          0x2E10
#define PCI_DEVICE_ID_INTEL_Q45_IG          0x2E12
#define PCI_DEVICE_ID_INTEL_G45_HB          0x2E20
#define PCI_DEVICE_ID_INTEL_G45_IG          0x2E22
#define PCI_DEVICE_ID_INTEL_G41_HB          0x2E30
#define PCI_DEVICE_ID_INTEL_G41_IG          0x2E32

/* cover 915 and 945 variants */
#define IS_I915 (agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_E7221_HB || \
                 agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82915G_HB || \
                 agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82915GM_HB || \
                 agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82945G_HB || \
                 agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82945GM_HB || \
                 agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82945GME_HB)

#define IS_I965 (agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82946GZ_HB || \
                 agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82G35_HB || \
                 agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82965Q_HB || \
                 agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82965G_HB || \
                 agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82965GM_HB || \
                 agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82965GME_HB)

#define IS_G33 (agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_G33_HB || \
                agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_Q35_HB || \
                agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_Q33_HB || \
                agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_IGDGM_HB || \
                agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_IGDG_HB)

#define IS_IGD (agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_IGDGM_HB || \
                agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_IGDG_HB)

#define IS_G4X (agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_IGD_E_HB || \
                agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_Q45_HB || \
                agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_G45_HB || \
                agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_GM45_HB || \
                agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_G41_HB)

extern int agp_memory_reserved;


/* Intel 815 register */
#define INTEL_815_APCONT        0x51
#define INTEL_815_ATTBASE_MASK  ~0x1FFFFFFF

/* Intel i820 registers */
#define INTEL_I820_RDCR         0x51
#define INTEL_I820_ERRSTS       0xc8

/* Intel i840 registers */
#define INTEL_I840_MCHCFG       0x50
#define INTEL_I840_ERRSTS       0xc8

/* Intel i850 registers */
#define INTEL_I850_MCHCFG       0x50
#define INTEL_I850_ERRSTS       0xc8

/* intel 915G registers */
#define I915_GMADDR     0x18
#define I915_MMADDR     0x10
#define I915_PTEADDR    0x1C
#define I915_GMCH_GMS_STOLEN_48M        (0x6 << 4)
#define I915_GMCH_GMS_STOLEN_64M        (0x7 << 4)
#define G33_GMCH_GMS_STOLEN_128M        (0x8 << 4)
#define G33_GMCH_GMS_STOLEN_256M        (0x9 << 4)
#define INTEL_GMCH_GMS_STOLEN_96M       (0xa << 4)
#define INTEL_GMCH_GMS_STOLEN_160M      (0xb << 4)
#define INTEL_GMCH_GMS_STOLEN_224M      (0xc << 4)
#define INTEL_GMCH_GMS_STOLEN_352M      (0xd << 4)

#define I915_IFPADDR    0x60

/* Intel 965G registers */
#define I965_MSAC 0x62
#define I965_IFPADDR    0x70

/* Intel 7505 registers */
#define INTEL_I7505_APSIZE      0x74
#define INTEL_I7505_NCAPID      0x60
#define INTEL_I7505_NISTAT      0x6c
#define INTEL_I7505_ATTBASE     0x78
#define INTEL_I7505_ERRSTS      0x42
#define INTEL_I7505_AGPCTRL     0x70
#define INTEL_I7505_MCHCFG      0x50

static const struct aper_size_info_fixed intel_i810_sizes[] =
{
        {64, 16384, 4},
        /* The 32M mode still requires a 64k gatt */
        {32, 8192, 4}
};

#define AGP_DCACHE_MEMORY       1
#define AGP_PHYS_MEMORY         2
#define INTEL_AGP_CACHED_MEMORY 3

static struct gatt_mask intel_i810_masks[] =
{
        {.mask = I810_PTE_VALID, .type = 0},
        {.mask = (I810_PTE_VALID | I810_PTE_LOCAL), .type = AGP_DCACHE_MEMORY},
        {.mask = I810_PTE_VALID, .type = 0},
        {.mask = I810_PTE_VALID | I830_PTE_SYSTEM_CACHED,
         .type = INTEL_AGP_CACHED_MEMORY}
};

static struct _intel_private {
        struct pci_dev *pcidev; /* device one */
        u8 __iomem *registers;
        u32 __iomem *gtt;               /* I915G */
        int num_dcache_entries;
        /* gtt_entries is the number of gtt entries that are already mapped
         * to stolen memory.  Stolen memory is larger than the memory mapped
         * through gtt_entries, as it includes some reserved space for the BIOS
         * popup and for the GTT.
         */
        int gtt_entries;                        /* i830+ */
        union {
                void __iomem *i9xx_flush_page;
                void *i8xx_flush_page;
        };
        struct page *i8xx_page;
        struct resource ifp_resource;
        int resource_valid;
} intel_private;

static int intel_i810_fetch_size(void)
{
        u32 smram_miscc;
        struct aper_size_info_fixed *values;

        pci_read_config_dword(agp_bridge->dev, I810_SMRAM_MISCC, &smram_miscc);
        values = A_SIZE_FIX(agp_bridge->driver->aperture_sizes);

        if ((smram_miscc & I810_GMS) == I810_GMS_DISABLE) {
                dev_warn(&agp_bridge->dev->dev, "i810 is disabled\n");
                return 0;
        }
        if ((smram_miscc & I810_GFX_MEM_WIN_SIZE) == I810_GFX_MEM_WIN_32M) {
                agp_bridge->previous_size =
                        agp_bridge->current_size = (void *) (values + 1);
                agp_bridge->aperture_size_idx = 1;
                return values[1].size;
        } else {
                agp_bridge->previous_size =
                        agp_bridge->current_size = (void *) (values);
                agp_bridge->aperture_size_idx = 0;
                return values[0].size;
        }

        return 0;
}

static int intel_i810_configure(void)
{
        struct aper_size_info_fixed *current_size;
        u32 temp;
        int i;

        current_size = A_SIZE_FIX(agp_bridge->current_size);

        if (!intel_private.registers) {
                pci_read_config_dword(intel_private.pcidev, I810_MMADDR, &temp);
                temp &= 0xfff80000;

                intel_private.registers = ioremap(temp, 128 * 4096);
                if (!intel_private.registers) {
                        dev_err(&intel_private.pcidev->dev,
                                "can't remap memory\n");
                        return -ENOMEM;
                }
        }

        if ((readl(intel_private.registers+I810_DRAM_CTL)
                & I810_DRAM_ROW_0) == I810_DRAM_ROW_0_SDRAM) {
                /* This will need to be dynamically assigned */
                dev_info(&intel_private.pcidev->dev,
                         "detected 4MB dedicated video ram\n");
                intel_private.num_dcache_entries = 1024;
        }
        pci_read_config_dword(intel_private.pcidev, I810_GMADDR, &temp);
        agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
        writel(agp_bridge->gatt_bus_addr | I810_PGETBL_ENABLED, intel_private.registers+I810_PGETBL_CTL);
        readl(intel_private.registers+I810_PGETBL_CTL); /* PCI Posting. */

        if (agp_bridge->driver->needs_scratch_page) {
                for (i = 0; i < current_size->num_entries; i++) {
                        writel(agp_bridge->scratch_page, intel_private.registers+I810_PTE_BASE+(i*4));
                }
                readl(intel_private.registers+I810_PTE_BASE+((i-1)*4)); /* PCI posting. */
        }
        global_cache_flush();
        return 0;
}

static void intel_i810_cleanup(void)
{
        writel(0, intel_private.registers+I810_PGETBL_CTL);
        readl(intel_private.registers); /* PCI Posting. */
        iounmap(intel_private.registers);
}

static void intel_i810_tlbflush(struct agp_memory *mem)
{
        return;
}

static void intel_i810_agp_enable(struct agp_bridge_data *bridge, u32 mode)
{
        return;
}

/* Exists to support ARGB cursors */
static void *i8xx_alloc_pages(void)
{
        struct page *page;

        page = alloc_pages(GFP_KERNEL | GFP_DMA32, 2);
        if (page == NULL)
                return NULL;

        if (set_pages_uc(page, 4) < 0) {
                set_pages_wb(page, 4);
                __free_pages(page, 2);
                return NULL;
        }
        get_page(page);
        atomic_inc(&agp_bridge->current_memory_agp);
        return page_address(page);
}

static void i8xx_destroy_pages(void *addr)
{
        struct page *page;

        if (addr == NULL)
                return;

        page = virt_to_page(addr);
        set_pages_wb(page, 4);
        put_page(page);
        __free_pages(page, 2);
        atomic_dec(&agp_bridge->current_memory_agp);
}

static int intel_i830_type_to_mask_type(struct agp_bridge_data *bridge,
                                        int type)
{
        if (type < AGP_USER_TYPES)
                return type;
        else if (type == AGP_USER_CACHED_MEMORY)
                return INTEL_AGP_CACHED_MEMORY;
        else
                return 0;
}

static int intel_i810_insert_entries(struct agp_memory *mem, off_t pg_start,
                                int type)
{
        int i, j, num_entries;
        void *temp;
        int ret = -EINVAL;
        int mask_type;

        if (mem->page_count == 0)
                goto out;

        temp = agp_bridge->current_size;
        num_entries = A_SIZE_FIX(temp)->num_entries;

        if ((pg_start + mem->page_count) > num_entries)
                goto out_err;


        for (j = pg_start; j < (pg_start + mem->page_count); j++) {
                if (!PGE_EMPTY(agp_bridge, readl(agp_bridge->gatt_table+j))) {
                        ret = -EBUSY;
                        goto out_err;
                }
        }

        if (type != mem->type)
                goto out_err;

        mask_type = agp_bridge->driver->agp_type_to_mask_type(agp_bridge, type);

        switch (mask_type) {
        case AGP_DCACHE_MEMORY:
                if (!mem->is_flushed)
                        global_cache_flush();
                for (i = pg_start; i < (pg_start + mem->page_count); i++) {
                        writel((i*4096)|I810_PTE_LOCAL|I810_PTE_VALID,
                               intel_private.registers+I810_PTE_BASE+(i*4));
                }
                readl(intel_private.registers+I810_PTE_BASE+((i-1)*4));
                break;
        case AGP_PHYS_MEMORY:
        case AGP_NORMAL_MEMORY:
                if (!mem->is_flushed)
                        global_cache_flush();
                for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
                        writel(agp_bridge->driver->mask_memory(agp_bridge,
                                                               mem->memory[i],
                                                               mask_type),
                               intel_private.registers+I810_PTE_BASE+(j*4));
                }
                readl(intel_private.registers+I810_PTE_BASE+((j-1)*4));
                break;
        default:
                goto out_err;
        }

        agp_bridge->driver->tlb_flush(mem);
out:
        ret = 0;
out_err:
        mem->is_flushed = true;
        return ret;
}

static int intel_i810_remove_entries(struct agp_memory *mem, off_t pg_start,
                                int type)
{
        int i;

        if (mem->page_count == 0)
                return 0;

        for (i = pg_start; i < (mem->page_count + pg_start); i++) {
                writel(agp_bridge->scratch_page, intel_private.registers+I810_PTE_BASE+(i*4));
        }
        readl(intel_private.registers+I810_PTE_BASE+((i-1)*4));

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

/*
 * The i810/i830 requires a physical address to program its mouse
 * pointer into hardware.
 * However the Xserver still writes to it through the agp aperture.
 */
static struct agp_memory *alloc_agpphysmem_i8xx(size_t pg_count, int type)
{
        struct agp_memory *new;
        void *addr;

        switch (pg_count) {
        case 1: addr = agp_bridge->driver->agp_alloc_page(agp_bridge);
                break;
        case 4:
                /* kludge to get 4 physical pages for ARGB cursor */
                addr = i8xx_alloc_pages();
                break;
        default:
                return NULL;
        }

        if (addr == NULL)
                return NULL;

        new = agp_create_memory(pg_count);
        if (new == NULL)
                return NULL;

        new->memory[0] = virt_to_gart(addr);
        if (pg_count == 4) {
                /* kludge to get 4 physical pages for ARGB cursor */
                new->memory[1] = new->memory[0] + PAGE_SIZE;
                new->memory[2] = new->memory[1] + PAGE_SIZE;
                new->memory[3] = new->memory[2] + PAGE_SIZE;
        }
        new->page_count = pg_count;
        new->num_scratch_pages = pg_count;
        new->type = AGP_PHYS_MEMORY;
        new->physical = new->memory[0];
        return new;
}

static struct agp_memory *intel_i810_alloc_by_type(size_t pg_count, int type)
{
        struct agp_memory *new;

        if (type == AGP_DCACHE_MEMORY) {
                if (pg_count != intel_private.num_dcache_entries)
                        return NULL;

                new = agp_create_memory(1);
                if (new == NULL)
                        return NULL;

                new->type = AGP_DCACHE_MEMORY;
                new->page_count = pg_count;
                new->num_scratch_pages = 0;
                agp_free_page_array(new);
                return new;
        }
        if (type == AGP_PHYS_MEMORY)
                return alloc_agpphysmem_i8xx(pg_count, type);
        return NULL;
}

static void intel_i810_free_by_type(struct agp_memory *curr)
{
        agp_free_key(curr->key);
        if (curr->type == AGP_PHYS_MEMORY) {
                if (curr->page_count == 4)
                        i8xx_destroy_pages(gart_to_virt(curr->memory[0]));
                else {
                        void *va = gart_to_virt(curr->memory[0]);

                        agp_bridge->driver->agp_destroy_page(va,
                                                             AGP_PAGE_DESTROY_UNMAP);
                        agp_bridge->driver->agp_destroy_page(va,
                                                             AGP_PAGE_DESTROY_FREE);
                }
                agp_free_page_array(curr);
        }
        kfree(curr);
}

static unsigned long intel_i810_mask_memory(struct agp_bridge_data *bridge,
        unsigned long addr, int type)
{
        /* Type checking must be done elsewhere */
        return addr | bridge->driver->masks[type].mask;
}

static struct aper_size_info_fixed intel_i830_sizes[] =
{
        {128, 32768, 5},
        /* The 64M mode still requires a 128k gatt */
        {64, 16384, 5},
        {256, 65536, 6},
        {512, 131072, 7},
};

static void intel_i830_init_gtt_entries(void)
{
        u16 gmch_ctrl;
        int gtt_entries;
        u8 rdct;
        int local = 0;
        static const int ddt[4] = { 0, 16, 32, 64 };
        int size; /* reserved space (in kb) at the top of stolen memory */

        pci_read_config_word(agp_bridge->dev, I830_GMCH_CTRL, &gmch_ctrl);

        if (IS_I965) {
                u32 pgetbl_ctl;
                pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);

                /* The 965 has a field telling us the size of the GTT,
                 * which may be larger than what is necessary to map the
                 * aperture.
                 */
                switch (pgetbl_ctl & I965_PGETBL_SIZE_MASK) {
                case I965_PGETBL_SIZE_128KB:
                        size = 128;
                        break;
                case I965_PGETBL_SIZE_256KB:
                        size = 256;
                        break;
                case I965_PGETBL_SIZE_512KB:
                        size = 512;
                        break;
                case I965_PGETBL_SIZE_1MB:
                        size = 1024;
                        break;
                case I965_PGETBL_SIZE_2MB:
                        size = 2048;
                        break;
                case I965_PGETBL_SIZE_1_5MB:
                        size = 1024 + 512;
                        break;
                default:
                        dev_info(&intel_private.pcidev->dev,
                                 "unknown page table size, assuming 512KB\n");
                        size = 512;
                }
                size += 4; /* add in BIOS popup space */
        } else if (IS_G33 && !IS_IGD) {
        /* G33's GTT size defined in gmch_ctrl */
                switch (gmch_ctrl & G33_PGETBL_SIZE_MASK) {
                case G33_PGETBL_SIZE_1M:
                        size = 1024;
                        break;
                case G33_PGETBL_SIZE_2M:
                        size = 2048;
                        break;
                default:
                        dev_info(&agp_bridge->dev->dev,
                                 "unknown page table size 0x%x, assuming 512KB\n",
                                (gmch_ctrl & G33_PGETBL_SIZE_MASK));
                        size = 512;
                }
                size += 4;
        } else if (IS_G4X || IS_IGD) {
                /* On 4 series hardware, GTT stolen is separate from graphics
                 * stolen, ignore it in stolen gtt entries counting.  However,
                 * 4KB of the stolen memory doesn't get mapped to the GTT.
                 */
                size = 4;
        } else {
                /* On previous hardware, the GTT size was just what was
                 * required to map the aperture.
                 */
                size = agp_bridge->driver->fetch_size() + 4;
        }

        if (agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82830_HB ||
            agp_bridge->dev->device == PCI_DEVICE_ID_INTEL_82845G_HB) {
                switch (gmch_ctrl & I830_GMCH_GMS_MASK) {
                case I830_GMCH_GMS_STOLEN_512:
                        gtt_entries = KB(512) - KB(size);
                        break;
                case I830_GMCH_GMS_STOLEN_1024:
                        gtt_entries = MB(1) - KB(size);
                        break;
                case I830_GMCH_GMS_STOLEN_8192:
                        gtt_entries = MB(8) - KB(size);
                        break;
                case I830_GMCH_GMS_LOCAL:
                        rdct = readb(intel_private.registers+I830_RDRAM_CHANNEL_TYPE);
                        gtt_entries = (I830_RDRAM_ND(rdct) + 1) *
                                        MB(ddt[I830_RDRAM_DDT(rdct)]);
                        local = 1;
                        break;
                default:
                        gtt_entries = 0;
                        break;
                }
        } else {
                switch (gmch_ctrl & I855_GMCH_GMS_MASK) {
                case I855_GMCH_GMS_STOLEN_1M:
                        gtt_entries = MB(1) - KB(size);
                        break;
                case I855_GMCH_GMS_STOLEN_4M:
                        gtt_entries = MB(4) - KB(size);
                        break;
                case I855_GMCH_GMS_STOLEN_8M:
                        gtt_entries = MB(8) - KB(size);
                        break;
                case I855_GMCH_GMS_STOLEN_16M:
                        gtt_entries = MB(16) - KB(size);
                        break;
                case I855_GMCH_GMS_STOLEN_32M:
                        gtt_entries = MB(32) - KB(size);
                        break;
                case I915_GMCH_GMS_STOLEN_48M:
                        /* Check it's really I915G */
                        if (IS_I915 || IS_I965 || IS_G33 || IS_G4X)
                                gtt_entries = MB(48) - KB(size);
                        else
                                gtt_entries = 0;
                        break;
                case I915_GMCH_GMS_STOLEN_64M:
                        /* Check it's really I915G */
                        if (IS_I915 || IS_I965 || IS_G33 || IS_G4X)
                                gtt_entries = MB(64) - KB(size);
                        else
                                gtt_entries = 0;
                        break;
                case G33_GMCH_GMS_STOLEN_128M:
                        if (IS_G33 || IS_I965 || IS_G4X)
                                gtt_entries = MB(128) - KB(size);
                        else
                                gtt_entries = 0;
                        break;
                case G33_GMCH_GMS_STOLEN_256M:
                        if (IS_G33 || IS_I965 || IS_G4X)
                                gtt_entries = MB(256) - KB(size);
                        else
                                gtt_entries = 0;
                        break;
                case INTEL_GMCH_GMS_STOLEN_96M:
                        if (IS_I965 || IS_G4X)
                                gtt_entries = MB(96) - KB(size);
                        else
                                gtt_entries = 0;
                        break;
                case INTEL_GMCH_GMS_STOLEN_160M:
                        if (IS_I965 || IS_G4X)
                                gtt_entries = MB(160) - KB(size);
                        else
                                gtt_entries = 0;
                        break;
                case INTEL_GMCH_GMS_STOLEN_224M:
                        if (IS_I965 || IS_G4X)
                                gtt_entries = MB(224) - KB(size);
                        else
                                gtt_entries = 0;
                        break;
                case INTEL_GMCH_GMS_STOLEN_352M:
                        if (IS_I965 || IS_G4X)
                                gtt_entries = MB(352) - KB(size);
                        else
                                gtt_entries = 0;
                        break;
                default:
                        gtt_entries = 0;
                        break;
                }
        }
        if (gtt_entries > 0) {
                dev_info(&agp_bridge->dev->dev, "detected %dK %s memory\n",
                       gtt_entries / KB(1), local ? "local" : "stolen");
                gtt_entries /= KB(4);
        } else {
                dev_info(&agp_bridge->dev->dev,
                       "no pre-allocated video memory detected\n");
                gtt_entries = 0;
        }

        intel_private.gtt_entries = gtt_entries;
}

static void intel_i830_fini_flush(void)
{
        kunmap(intel_private.i8xx_page);
        intel_private.i8xx_flush_page = NULL;
        unmap_page_from_agp(intel_private.i8xx_page);

        __free_page(intel_private.i8xx_page);
        intel_private.i8xx_page = NULL;
}

static void intel_i830_setup_flush(void)
{
        /* return if we've already set the flush mechanism up */
        if (intel_private.i8xx_page)
                return;

        intel_private.i8xx_page = alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA32);
        if (!intel_private.i8xx_page)
                return;

        /* make page uncached */
        map_page_into_agp(intel_private.i8xx_page);

        intel_private.i8xx_flush_page = kmap(intel_private.i8xx_page);
        if (!intel_private.i8xx_flush_page)
                intel_i830_fini_flush();
}

static void intel_i830_chipset_flush(struct agp_bridge_data *bridge)
{
        unsigned int *pg = intel_private.i8xx_flush_page;
        int i;

        for (i = 0; i < 256; i += 2)
                *(pg + i) = i;

        wmb();
}

/* The intel i830 automatically initializes the agp aperture during POST.
 * Use the memory already set aside for in the GTT.
 */
static int intel_i830_create_gatt_table(struct agp_bridge_data *bridge)
{
        int page_order;
        struct aper_size_info_fixed *size;
        int num_entries;
        u32 temp;

        size = agp_bridge->current_size;
        page_order = size->page_order;
        num_entries = size->num_entries;
        agp_bridge->gatt_table_real = NULL;

        pci_read_config_dword(intel_private.pcidev, I810_MMADDR, &temp);
        temp &= 0xfff80000;

        intel_private.registers = ioremap(temp, 128 * 4096);
        if (!intel_private.registers)
                return -ENOMEM;

        temp = readl(intel_private.registers+I810_PGETBL_CTL) & 0xfffff000;
        global_cache_flush();   /* FIXME: ?? */

        /* we have to call this as early as possible after the MMIO base address is known */
        intel_i830_init_gtt_entries();

        agp_bridge->gatt_table = NULL;

        agp_bridge->gatt_bus_addr = temp;

        return 0;
}

/* Return the gatt table to a sane state. Use the top of stolen
 * memory for the GTT.
 */
static int intel_i830_free_gatt_table(struct agp_bridge_data *bridge)
{
        return 0;
}

static int intel_i830_fetch_size(void)
{
        u16 gmch_ctrl;
        struct aper_size_info_fixed *values;

        values = A_SIZE_FIX(agp_bridge->driver->aperture_sizes);

        if (agp_bridge->dev->device != PCI_DEVICE_ID_INTEL_82830_HB &&
            agp_bridge->dev->device != PCI_DEVICE_ID_INTEL_82845G_HB) {
                /* 855GM/852GM/865G has 128MB aperture size */
                agp_bridge->previous_size = agp_bridge->current_size = (void *) values;
                agp_bridge->aperture_size_idx = 0;
                return values[0].size;
        }

        pci_read_config_word(agp_bridge->dev, I830_GMCH_CTRL, &gmch_ctrl);

        if ((gmch_ctrl & I830_GMCH_MEM_MASK) == I830_GMCH_MEM_128M) {
                agp_bridge->previous_size = agp_bridge->current_size = (void *) values;
                agp_bridge->aperture_size_idx = 0;
                return values[0].size;
        } else {
                agp_bridge->previous_size = agp_bridge->current_size = (void *) (values + 1);
                agp_bridge->aperture_size_idx = 1;
                return values[1].size;
        }

        return 0;
}

static int intel_i830_configure(void)
{
        struct aper_size_info_fixed *current_size;
        u32 temp;
        u16 gmch_ctrl;
        int i;

        current_size = A_SIZE_FIX(agp_bridge->current_size);

        pci_read_config_dword(intel_private.pcidev, I810_GMADDR, &temp);
        agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);

        pci_read_config_word(agp_bridge->dev, I830_GMCH_CTRL, &gmch_ctrl);
        gmch_ctrl |= I830_GMCH_ENABLED;
        pci_write_config_word(agp_bridge->dev, I830_GMCH_CTRL, gmch_ctrl);

        writel(agp_bridge->gatt_bus_addr|I810_PGETBL_ENABLED, intel_private.registers+I810_PGETBL_CTL);
        readl(intel_private.registers+I810_PGETBL_CTL); /* PCI Posting. */

        if (agp_bridge->driver->needs_scratch_page) {
                for (i = intel_private.gtt_entries; i < current_size->num_entries; i++) {
                        writel(agp_bridge->scratch_page, intel_private.registers+I810_PTE_BASE+(i*4));
                }
                readl(intel_private.registers+I810_PTE_BASE+((i-1)*4)); /* PCI Posting. */
        }

        global_cache_flush();

        intel_i830_setup_flush();
        return 0;
}

static void intel_i830_cleanup(void)
{
        iounmap(intel_private.registers);
}

static int intel_i830_insert_entries(struct agp_memory *mem, off_t pg_start,
                                     int type)
{
        int i, j, num_entries;
        void *temp;
        int ret = -EINVAL;
        int mask_type;

        if (mem->page_count == 0)
                goto out;

        temp = agp_bridge->current_size;
        num_entries = A_SIZE_FIX(temp)->num_entries;

        if (pg_start < intel_private.gtt_entries) {
                dev_printk(KERN_DEBUG, &intel_private.pcidev->dev,
                           "pg_start == 0x%.8lx, intel_private.gtt_entries == 0x%.8x\n",
                           pg_start, intel_private.gtt_entries);

                dev_info(&intel_private.pcidev->dev,
                         "trying to insert into local/stolen memory\n");
                goto out_err;
        }

        if ((pg_start + mem->page_count) > num_entries)
                goto out_err;

        /* The i830 can't check the GTT for entries since its read only,
         * depend on the caller to make the correct offset decisions.
         */

        if (type != mem->type)
                goto out_err;

        mask_type = agp_bridge->driver->agp_type_to_mask_type(agp_bridge, type);

        if (mask_type != 0 && mask_type != AGP_PHYS_MEMORY &&
            mask_type != INTEL_AGP_CACHED_MEMORY)
                goto out_err;

        if (!mem->is_flushed)
                global_cache_flush();

        for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
                writel(agp_bridge->driver->mask_memory(agp_bridge,
                                                       mem->memory[i], mask_type),
                       intel_private.registers+I810_PTE_BASE+(j*4));
        }
        readl(intel_private.registers+I810_PTE_BASE+((j-1)*4));
        agp_bridge->driver->tlb_flush(mem);

out:
        ret = 0;
out_err:
        mem->is_flushed = true;
        return ret;
}

static int intel_i830_remove_entries(struct agp_memory *mem, off_t pg_start,
                                     int type)
{
        int i;

        if (mem->page_count == 0)
                return 0;

        if (pg_start < intel_private.gtt_entries) {
                dev_info(&intel_private.pcidev->dev,
                         "trying to disable local/stolen memory\n");
                return -EINVAL;
        }

        for (i = pg_start; i < (mem->page_count + pg_start); i++) {
                writel(agp_bridge->scratch_page, intel_private.registers+I810_PTE_BASE+(i*4));
        }
        readl(intel_private.registers+I810_PTE_BASE+((i-1)*4));

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

static struct agp_memory *intel_i830_alloc_by_type(size_t pg_count, int type)
{
        if (type == AGP_PHYS_MEMORY)
                return alloc_agpphysmem_i8xx(pg_count, type);
        /* always return NULL for other allocation types for now */
        return NULL;
}

static int intel_alloc_chipset_flush_resource(void)
{
        int ret;
        ret = pci_bus_alloc_resource(agp_bridge->dev->bus, &intel_private.ifp_resource, PAGE_SIZE,
                                     PAGE_SIZE, PCIBIOS_MIN_MEM, 0,
                                     pcibios_align_resource, agp_bridge->dev);

        return ret;
}

static void intel_i915_setup_chipset_flush(void)
{
        int ret;
        u32 temp;

        pci_read_config_dword(agp_bridge->dev, I915_IFPADDR, &temp);
        if (!(temp & 0x1)) {
                intel_alloc_chipset_flush_resource();
                intel_private.resource_valid = 1;
                pci_write_config_dword(agp_bridge->dev, I915_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
        } else {
                temp &= ~1;

                intel_private.resource_valid = 1;
                intel_private.ifp_resource.start = temp;
                intel_private.ifp_resource.end = temp + PAGE_SIZE;
                ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
                /* some BIOSes reserve this area in a pnp some don't */
                if (ret)
                        intel_private.resource_valid = 0;
        }
}

static void intel_i965_g33_setup_chipset_flush(void)
{
        u32 temp_hi, temp_lo;
        int ret;

        pci_read_config_dword(agp_bridge->dev, I965_IFPADDR + 4, &temp_hi);
        pci_read_config_dword(agp_bridge->dev, I965_IFPADDR, &temp_lo);

        if (!(temp_lo & 0x1)) {

                intel_alloc_chipset_flush_resource();

                intel_private.resource_valid = 1;
                pci_write_config_dword(agp_bridge->dev, I965_IFPADDR + 4,
                        upper_32_bits(intel_private.ifp_resource.start));
                pci_write_config_dword(agp_bridge->dev, I965_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
        } else {
                u64 l64;

                temp_lo &= ~0x1;
                l64 = ((u64)temp_hi << 32) | temp_lo;

                intel_private.resource_valid = 1;
                intel_private.ifp_resource.start = l64;
                intel_private.ifp_resource.end = l64 + PAGE_SIZE;
                ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
                /* some BIOSes reserve this area in a pnp some don't */
                if (ret)
                        intel_private.resource_valid = 0;
        }
}

static void intel_i9xx_setup_flush(void)
{
        /* return if already configured */
        if (intel_private.ifp_resource.start)
                return;

        /* setup a resource for this object */
        intel_private.ifp_resource.name = "Intel Flush Page";
        intel_private.ifp_resource.flags = IORESOURCE_MEM;

        /* Setup chipset flush for 915 */
        if (IS_I965 || IS_G33 || IS_G4X) {
                intel_i965_g33_setup_chipset_flush();
        } else {
                intel_i915_setup_chipset_flush();
        }

        if (intel_private.ifp_resource.start) {
                intel_private.i9xx_flush_page = ioremap_nocache(intel_private.ifp_resource.start, PAGE_SIZE);
                if (!intel_private.i9xx_flush_page)
                        dev_info(&intel_private.pcidev->dev, "can't ioremap flush page - no chipset flushing");
        }
}

static int intel_i915_configure(void)
{
        struct aper_size_info_fixed *current_size;
        u32 temp;
        u16 gmch_ctrl;
        int i;

        current_size = A_SIZE_FIX(agp_bridge->current_size);

        pci_read_config_dword(intel_private.pcidev, I915_GMADDR, &temp);

        agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);

        pci_read_config_word(agp_bridge->dev, I830_GMCH_CTRL, &gmch_ctrl);
        gmch_ctrl |= I830_GMCH_ENABLED;
        pci_write_config_word(agp_bridge->dev, I830_GMCH_CTRL, gmch_ctrl);

        writel(agp_bridge->gatt_bus_addr|I810_PGETBL_ENABLED, intel_private.registers+I810_PGETBL_CTL);
        readl(intel_private.registers+I810_PGETBL_CTL); /* PCI Posting. */

        if (agp_bridge->driver->needs_scratch_page) {
                for (i = intel_private.gtt_entries; i < current_size->num_entries; i++) {
                        writel(agp_bridge->scratch_page, intel_private.gtt+i);
                }
                readl(intel_private.gtt+i-1);   /* PCI Posting. */
        }

        global_cache_flush();

        intel_i9xx_setup_flush();

        return 0;
}

static void intel_i915_cleanup(void)
{
        if (intel_private.i9xx_flush_page)
                iounmap(intel_private.i9xx_flush_page);
        if (intel_private.resource_valid)
                release_resource(&intel_private.ifp_resource);
        intel_private.ifp_resource.start = 0;
        intel_private.resource_valid = 0;
        iounmap(intel_private.gtt);
        iounmap(intel_private.registers);
}

static void intel_i915_chipset_flush(struct agp_bridge_data *bridge)
{
        if (intel_private.i9xx_flush_page)
                writel(1, intel_private.i9xx_flush_page);
}

static int intel_i915_insert_entries(struct agp_memory *mem, off_t pg_start,
                                     int type)
{
        int i, j, num_entries;
        void *temp;
        int ret = -EINVAL;
        int mask_type;

        if (mem->page_count == 0)
                goto out;

        temp = agp_bridge->current_size;
        num_entries = A_SIZE_FIX(temp)->num_entries;

        if (pg_start < intel_private.gtt_entries) {
                dev_printk(KERN_DEBUG, &intel_private.pcidev->dev,
                           "pg_start == 0x%.8lx, intel_private.gtt_entries == 0x%.8x\n",
                           pg_start, intel_private.gtt_entries);

                dev_info(&intel_private.pcidev->dev,
                         "trying to insert into local/stolen memory\n");
                goto out_err;
        }

        if ((pg_start + mem->page_count) > num_entries)
                goto out_err;

        /* The i915 can't check the GTT for entries since its read only,
         * depend on the caller to make the correct offset decisions.
         */

        if (type != mem->type)
                goto out_err;

        mask_type = agp_bridge->driver->agp_type_to_mask_type(agp_bridge, type);

        if (mask_type != 0 && mask_type != AGP_PHYS_MEMORY &&
            mask_type != INTEL_AGP_CACHED_MEMORY)
                goto out_err;

        if (!mem->is_flushed)
                global_cache_flush();

        for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
                writel(agp_bridge->driver->mask_memory(agp_bridge,
                        mem->memory[i], mask_type), intel_private.gtt+j);
        }

        readl(intel_private.gtt+j-1);
        agp_bridge->driver->tlb_flush(mem);

 out:
        ret = 0;
 out_err:
        mem->is_flushed = true;
        return ret;
}

static int intel_i915_remove_entries(struct agp_memory *mem, off_t pg_start,
                                     int type)
{
        int i;

        if (mem->page_count == 0)
                return 0;

        if (pg_start < intel_private.gtt_entries) {
                dev_info(&intel_private.pcidev->dev,
                         "trying to disable local/stolen memory\n");
                return -EINVAL;
        }

        for (i = pg_start; i < (mem->page_count + pg_start); i++)
                writel(agp_bridge->scratch_page, intel_private.gtt+i);

        readl(intel_private.gtt+i-1);

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

/* Return the aperture size by just checking the resource length.  The effect
 * described in the spec of the MSAC registers is just changing of the
 * resource size.
 */
static int intel_i9xx_fetch_size(void)
{
        int num_sizes = ARRAY_SIZE(intel_i830_sizes);
        int aper_size; /* size in megabytes */
        int i;

        aper_size = pci_resource_len(intel_private.pcidev, 2) / MB(1);

        for (i = 0; i < num_sizes; i++) {
                if (aper_size == intel_i830_sizes[i].size) {
                        agp_bridge->current_size = intel_i830_sizes + i;
                        agp_bridge->previous_size = agp_bridge->current_size;
                        return aper_size;
                }
        }

        return 0;
}

/* The intel i915 automatically initializes the agp aperture during POST.
 * Use the memory already set aside for in the GTT.
 */
static int intel_i915_create_gatt_table(struct agp_bridge_data *bridge)
{
        int page_order;
        struct aper_size_info_fixed *size;
        int num_entries;
        u32 temp, temp2;
        int gtt_map_size = 256 * 1024;

        size = agp_bridge->current_size;
        page_order = size->page_order;
        num_entries = size->num_entries;
        agp_bridge->gatt_table_real = NULL;

        pci_read_config_dword(intel_private.pcidev, I915_MMADDR, &temp);
        pci_read_config_dword(intel_private.pcidev, I915_PTEADDR, &temp2);

        if (IS_G33)
            gtt_map_size = 1024 * 1024; /* 1M on G33 */
        intel_private.gtt = ioremap(temp2, gtt_map_size);
        if (!intel_private.gtt)
                return -ENOMEM;

        temp &= 0xfff80000;

        intel_private.registers = ioremap(temp, 128 * 4096);
        if (!intel_private.registers) {
                iounmap(intel_private.gtt);
                return -ENOMEM;
        }

        temp = readl(intel_private.registers+I810_PGETBL_CTL) & 0xfffff000;
        global_cache_flush();   /* FIXME: ? */

        /* we have to call this as early as possible after the MMIO base address is known */
        intel_i830_init_gtt_entries();

        agp_bridge->gatt_table = NULL;

        agp_bridge->gatt_bus_addr = temp;

        return 0;
}

/*
 * The i965 supports 36-bit physical addresses, but to keep
 * the format of the GTT the same, the bits that don't fit
 * in a 32-bit word are shifted down to bits 4..7.
 *
 * Gcc is smart enough to notice that "(addr >> 28) & 0xf0"
 * is always zero on 32-bit architectures, so no need to make
 * this conditional.
 */
static unsigned long intel_i965_mask_memory(struct agp_bridge_data *bridge,
        unsigned long addr, int type)
{
        /* Shift high bits down */
        addr |= (addr >> 28) & 0xf0;

        /* Type checking must be done elsewhere */
        return addr | bridge->driver->masks[type].mask;
}

static void intel_i965_get_gtt_range(int *gtt_offset, int *gtt_size)
{
        switch (agp_bridge->dev->device) {
        case PCI_DEVICE_ID_INTEL_GM45_HB:
        case PCI_DEVICE_ID_INTEL_IGD_E_HB:
        case PCI_DEVICE_ID_INTEL_Q45_HB:
        case PCI_DEVICE_ID_INTEL_G45_HB:
        case PCI_DEVICE_ID_INTEL_G41_HB:
                *gtt_offset = *gtt_size = MB(2);
                break;
        default:
                *gtt_offset = *gtt_size = KB(512);
        }
}

/* The intel i965 automatically initializes the agp aperture during POST.
 * Use the memory already set aside for in the GTT.
 */
static int intel_i965_create_gatt_table(struct agp_bridge_data *bridge)
{
        int page_order;
        struct aper_size_info_fixed *size;
        int num_entries;
        u32 temp;
        int gtt_offset, gtt_size;

        size = agp_bridge->current_size;
        page_order = size->page_order;
        num_entries = size->num_entries;
        agp_bridge->gatt_table_real = NULL;

        pci_read_config_dword(intel_private.pcidev, I915_MMADDR, &temp);

        temp &= 0xfff00000;

        intel_i965_get_gtt_range(&gtt_offset, &gtt_size);

        intel_private.gtt = ioremap((temp + gtt_offset) , gtt_size);

        if (!intel_private.gtt)
                return -ENOMEM;

        intel_private.registers = ioremap(temp, 128 * 4096);
        if (!intel_private.registers) {
                iounmap(intel_private.gtt);
                return -ENOMEM;
        }

        temp = readl(intel_private.registers+I810_PGETBL_CTL) & 0xfffff000;
        global_cache_flush();   /* FIXME: ? */

        /* we have to call this as early as possible after the MMIO base address is known */
        intel_i830_init_gtt_entries();

        agp_bridge->gatt_table = NULL;

        agp_bridge->gatt_bus_addr = temp;

        return 0;
}


static int intel_fetch_size(void)
{
        int i;
        u16 temp;
        struct aper_size_info_16 *values;

        pci_read_config_word(agp_bridge->dev, INTEL_APSIZE, &temp);
        values = A_SIZE_16(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 int __intel_8xx_fetch_size(u8 temp)
{
        int i;
        struct aper_size_info_8 *values;

        values = A_SIZE_8(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 int intel_8xx_fetch_size(void)
{
        u8 temp;

        pci_read_config_byte(agp_bridge->dev, INTEL_APSIZE, &temp);
        return __intel_8xx_fetch_size(temp);
}

static int intel_815_fetch_size(void)
{
        u8 temp;

        /* Intel 815 chipsets have a _weird_ APSIZE register with only
         * one non-reserved bit, so mask the others out ... */
        pci_read_config_byte(agp_bridge->dev, INTEL_APSIZE, &temp);
        temp &= (1 << 3);

        return __intel_8xx_fetch_size(temp);
}

static void intel_tlbflush(struct agp_memory *mem)
{
        pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2200);
        pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2280);
}


static void intel_8xx_tlbflush(struct agp_memory *mem)
{
        u32 temp;
        pci_read_config_dword(agp_bridge->dev, INTEL_AGPCTRL, &temp);
        pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, temp & ~(1 << 7));
        pci_read_config_dword(agp_bridge->dev, INTEL_AGPCTRL, &temp);
        pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, temp | (1 << 7));
}


static void intel_cleanup(void)
{
        u16 temp;
        struct aper_size_info_16 *previous_size;

        previous_size = A_SIZE_16(agp_bridge->previous_size);
        pci_read_config_word(agp_bridge->dev, INTEL_NBXCFG, &temp);
        pci_write_config_word(agp_bridge->dev, INTEL_NBXCFG, temp & ~(1 << 9));
        pci_write_config_word(agp_bridge->dev, INTEL_APSIZE, previous_size->size_value);
}


static void intel_8xx_cleanup(void)
{
        u16 temp;
        struct aper_size_info_8 *previous_size;

        previous_size = A_SIZE_8(agp_bridge->previous_size);
        pci_read_config_word(agp_bridge->dev, INTEL_NBXCFG, &temp);
        pci_write_config_word(agp_bridge->dev, INTEL_NBXCFG, temp & ~(1 << 9));
        pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, previous_size->size_value);
}


static int intel_configure(void)
{
        u32 temp;
        u16 temp2;
        struct aper_size_info_16 *current_size;

        current_size = A_SIZE_16(agp_bridge->current_size);

        /* aperture size */
        pci_write_config_word(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);

        /* 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);

        /* attbase - aperture base */
        pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);

        /* agpctrl */
        pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2280);

        /* paccfg/nbxcfg */
        pci_read_config_word(agp_bridge->dev, INTEL_NBXCFG, &temp2);
        pci_write_config_word(agp_bridge->dev, INTEL_NBXCFG,
                        (temp2 & ~(1 << 10)) | (1 << 9));
        /* clear any possible error conditions */
        pci_write_config_byte(agp_bridge->dev, INTEL_ERRSTS + 1, 7);
        return 0;
}

static int intel_815_configure(void)
{
        u32 temp, addr;
        u8 temp2;
        struct aper_size_info_8 *current_size;

        /* attbase - aperture base */
        /* the Intel 815 chipset spec. says that bits 29-31 in the
        * ATTBASE register are reserved -> try not to write them */
        if (agp_bridge->gatt_bus_addr & INTEL_815_ATTBASE_MASK) {
                dev_emerg(&agp_bridge->dev->dev, "gatt bus addr too high");
                return -EINVAL;
        }

        current_size = A_SIZE_8(agp_bridge->current_size);

        /* aperture size */
        pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE,
                        current_size->size_value);

        /* 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);

        pci_read_config_dword(agp_bridge->dev, INTEL_ATTBASE, &addr);
        addr &= INTEL_815_ATTBASE_MASK;
        addr |= agp_bridge->gatt_bus_addr;
        pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, addr);

        /* agpctrl */
        pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);

        /* apcont */
        pci_read_config_byte(agp_bridge->dev, INTEL_815_APCONT, &temp2);
        pci_write_config_byte(agp_bridge->dev, INTEL_815_APCONT, temp2 | (1 << 1));

        /* clear any possible error conditions */
        /* Oddness : this chipset seems to have no ERRSTS register ! */
        return 0;
}

static void intel_820_tlbflush(struct agp_memory *mem)
{
        return;
}

static void intel_820_cleanup(void)
{
        u8 temp;
        struct aper_size_info_8 *previous_size;

        previous_size = A_SIZE_8(agp_bridge->previous_size);
        pci_read_config_byte(agp_bridge->dev, INTEL_I820_RDCR, &temp);
        pci_write_config_byte(agp_bridge->dev, INTEL_I820_RDCR,
                        temp & ~(1 << 1));
        pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE,
                        previous_size->size_value);
}


static int intel_820_configure(void)
{
        u32 temp;
        u8 temp2;
        struct aper_size_info_8 *current_size;

        current_size = A_SIZE_8(agp_bridge->current_size);

        /* aperture size */
        pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);

        /* 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);

        /* attbase - aperture base */
        pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);

        /* agpctrl */
        pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);

        /* global enable aperture access */
        /* This flag is not accessed through MCHCFG register as in */
        /* i850 chipset. */
        pci_read_config_byte(agp_bridge->dev, INTEL_I820_RDCR, &temp2);
        pci_write_config_byte(agp_bridge->dev, INTEL_I820_RDCR, temp2 | (1 << 1));
        /* clear any possible AGP-related error conditions */
        pci_write_config_word(agp_bridge->dev, INTEL_I820_ERRSTS, 0x001c);
        return 0;
}

static int intel_840_configure(void)
{
        u32 temp;
        u16 temp2;
        struct aper_size_info_8 *current_size;

        current_size = A_SIZE_8(agp_bridge->current_size);

        /* aperture size */
        pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);

        /* 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);

        /* attbase - aperture base */
        pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);

        /* agpctrl */
        pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);

        /* mcgcfg */
        pci_read_config_word(agp_bridge->dev, INTEL_I840_MCHCFG, &temp2);
        pci_write_config_word(agp_bridge->dev, INTEL_I840_MCHCFG, temp2 | (1 << 9));
        /* clear any possible error conditions */
        pci_write_config_word(agp_bridge->dev, INTEL_I840_ERRSTS, 0xc000);
        return 0;
}

static int intel_845_configure(void)
{
        u32 temp;
        u8 temp2;
        struct aper_size_info_8 *current_size;

        current_size = A_SIZE_8(agp_bridge->current_size);

        /* aperture size */
        pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);

        if (agp_bridge->apbase_config != 0) {
                pci_write_config_dword(agp_bridge->dev, AGP_APBASE,
                                       agp_bridge->apbase_config);
        } else {
                /* 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);
                agp_bridge->apbase_config = temp;
        }

        /* attbase - aperture base */
        pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);

        /* agpctrl */
        pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);

        /* agpm */
        pci_read_config_byte(agp_bridge->dev, INTEL_I845_AGPM, &temp2);
        pci_write_config_byte(agp_bridge->dev, INTEL_I845_AGPM, temp2 | (1 << 1));
        /* clear any possible error conditions */
        pci_write_config_word(agp_bridge->dev, INTEL_I845_ERRSTS, 0x001c);

        intel_i830_setup_flush();
        return 0;
}

static int intel_850_configure(void)
{
        u32 temp;
        u16 temp2;
        struct aper_size_info_8 *current_size;

        current_size = A_SIZE_8(agp_bridge->current_size);

        /* aperture size */
        pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);

        /* 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);

        /* attbase - aperture base */
        pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);

        /* agpctrl */
        pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);

        /* mcgcfg */
        pci_read_config_word(agp_bridge->dev, INTEL_I850_MCHCFG, &temp2);
        pci_write_config_word(agp_bridge->dev, INTEL_I850_MCHCFG, temp2 | (1 << 9));
        /* clear any possible AGP-related error conditions */
        pci_write_config_word(agp_bridge->dev, INTEL_I850_ERRSTS, 0x001c);
        return 0;
}

static int intel_860_configure(void)
{
        u32 temp;
        u16 temp2;
        struct aper_size_info_8 *current_size;

        current_size = A_SIZE_8(agp_bridge->current_size);

        /* aperture size */
        pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);

        /* 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);

        /* attbase - aperture base */
        pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);

        /* agpctrl */
        pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);

        /* mcgcfg */
        pci_read_config_word(agp_bridge->dev, INTEL_I860_MCHCFG, &temp2);
        pci_write_config_word(agp_bridge->dev, INTEL_I860_MCHCFG, temp2 | (1 << 9));
        /* clear any possible AGP-related error conditions */
        pci_write_config_word(agp_bridge->dev, INTEL_I860_ERRSTS, 0xf700);
        return 0;
}

static int intel_830mp_configure(void)
{
        u32 temp;
        u16 temp2;
        struct aper_size_info_8 *current_size;

        current_size = A_SIZE_8(agp_bridge->current_size);

        /* aperture size */
        pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);

        /* 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);

        /* attbase - aperture base */
        pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);

        /* agpctrl */
        pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);

        /* gmch */
        pci_read_config_word(agp_bridge->dev, INTEL_NBXCFG, &temp2);
        pci_write_config_word(agp_bridge->dev, INTEL_NBXCFG, temp2 | (1 << 9));
        /* clear any possible AGP-related error conditions */
        pci_write_config_word(agp_bridge->dev, INTEL_I830_ERRSTS, 0x1c);
        return 0;
}

static int intel_7505_configure(void)
{
        u32 temp;
        u16 temp2;
        struct aper_size_info_8 *current_size;

        current_size = A_SIZE_8(agp_bridge->current_size);

        /* aperture size */
        pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);

        /* 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);

        /* attbase - aperture base */
        pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);

        /* agpctrl */
        pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);

        /* mchcfg */
        pci_read_config_word(agp_bridge->dev, INTEL_I7505_MCHCFG, &temp2);
        pci_write_config_word(agp_bridge->dev, INTEL_I7505_MCHCFG, temp2 | (1 << 9));

        return 0;
}

/* Setup function */
static const struct gatt_mask intel_generic_masks[] =
{
        {.mask = 0x00000017, .type = 0}
};

static const struct aper_size_info_8 intel_815_sizes[2] =
{
        {64, 16384, 4, 0},
        {32, 8192, 3, 8},
};

static const struct aper_size_info_8 intel_8xx_sizes[7] =
{
        {256, 65536, 6, 0},
        {128, 32768, 5, 32},
        {64, 16384, 4, 48},
        {32, 8192, 3, 56},
        {16, 4096, 2, 60},
        {8, 2048, 1, 62},
        {4, 1024, 0, 63}
};

static const struct aper_size_info_16 intel_generic_sizes[7] =
{
        {256, 65536, 6, 0},
        {128, 32768, 5, 32},
        {64, 16384, 4, 48},
        {32, 8192, 3, 56},
        {16, 4096, 2, 60},
        {8, 2048, 1, 62},
        {4, 1024, 0, 63}
};

static const struct aper_size_info_8 intel_830mp_sizes[4] =
{
        {256, 65536, 6, 0},
        {128, 32768, 5, 32},
        {64, 16384, 4, 48},
        {32, 8192, 3, 56}
};

static const struct agp_bridge_driver intel_generic_driver = {
        .owner                  = THIS_MODULE,
        .aperture_sizes         = intel_generic_sizes,
        .size_type              = U16_APER_SIZE,
        .num_aperture_sizes     = 7,
        .configure              = intel_configure,
        .fetch_size             = intel_fetch_size,
        .cleanup                = intel_cleanup,
        .tlb_flush              = intel_tlbflush,
        .mask_memory            = agp_generic_mask_memory,
        .masks                  = intel_generic_masks,
        .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_alloc_pages        = agp_generic_alloc_pages,
        .agp_destroy_page       = agp_generic_destroy_page,
        .agp_destroy_pages      = agp_generic_destroy_pages,
        .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
};

static const struct agp_bridge_driver intel_810_driver = {
        .owner                  = THIS_MODULE,
        .aperture_sizes         = intel_i810_sizes,
        .size_type              = FIXED_APER_SIZE,
        .num_aperture_sizes     = 2,
        .needs_scratch_page     = true,
        .configure              = intel_i810_configure,
        .fetch_size             = intel_i810_fetch_size,
        .cleanup                = intel_i810_cleanup,
        .tlb_flush              = intel_i810_tlbflush,
        .mask_memory            = intel_i810_mask_memory,
        .masks                  = intel_i810_masks,
        .agp_enable             = intel_i810_agp_enable,
        .cache_flush            = global_cache_flush,
        .create_gatt_table      = agp_generic_create_gatt_table,
        .free_gatt_table        = agp_generic_free_gatt_table,
        .insert_memory          = intel_i810_insert_entries,
        .remove_memory          = intel_i810_remove_entries,
        .alloc_by_type          = intel_i810_alloc_by_type,
        .free_by_type           = intel_i810_free_by_type,
        .agp_alloc_page         = agp_generic_alloc_page,
        .agp_alloc_pages        = agp_generic_alloc_pages,
        .agp_destroy_page       = agp_generic_destroy_page,
        .agp_destroy_pages      = agp_generic_destroy_pages,
        .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
};

static const struct agp_bridge_driver intel_815_driver = {
        .owner                  = THIS_MODULE,
        .aperture_sizes         = intel_815_sizes,
        .size_type              = U8_APER_SIZE,
        .num_aperture_sizes     = 2,
        .configure              = intel_815_configure,
        .fetch_size             = intel_815_fetch_size,
        .cleanup                = intel_8xx_cleanup,
        .tlb_flush              = intel_8xx_tlbflush,
        .mask_memory            = agp_generic_mask_memory,
        .masks                  = intel_generic_masks,
        .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_alloc_pages        = agp_generic_alloc_pages,
        .agp_destroy_page       = agp_generic_destroy_page,
        .agp_destroy_pages      = agp_generic_destroy_pages,
        .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
};

static const struct agp_bridge_driver intel_830_driver = {
        .owner                  = THIS_MODULE,
        .aperture_sizes         = intel_i830_sizes,
        .size_type              = FIXED_APER_SIZE,
        .num_aperture_sizes     = 4,
        .needs_scratch_page     = true,
        .configure              = intel_i830_configure,
        .fetch_size             = intel_i830_fetch_size,
        .cleanup                = intel_i830_cleanup,
        .tlb_flush              = intel_i810_tlbflush,
        .mask_memory            = intel_i810_mask_memory,
        .masks                  = intel_i810_masks,
        .agp_enable             = intel_i810_agp_enable,
        .cache_flush            = global_cache_flush,
        .create_gatt_table      = intel_i830_create_gatt_table,
        .free_gatt_table        = intel_i830_free_gatt_table,
        .insert_memory          = intel_i830_insert_entries,
        .remove_memory          = intel_i830_remove_entries,
        .alloc_by_type          = intel_i830_alloc_by_type,
        .free_by_type           = intel_i810_free_by_type,
        .agp_alloc_page         = agp_generic_alloc_page,
        .agp_alloc_pages        = agp_generic_alloc_pages,
        .agp_destroy_page       = agp_generic_destroy_page,
        .agp_destroy_pages      = agp_generic_destroy_pages,
        .agp_type_to_mask_type  = intel_i830_type_to_mask_type,
        .chipset_flush          = intel_i830_chipset_flush,
};

static const struct agp_bridge_driver intel_820_driver = {
        .owner                  = THIS_MODULE,
        .aperture_sizes         = intel_8xx_sizes,
        .size_type              = U8_APER_SIZE,
        .num_aperture_sizes     = 7,
        .configure              = intel_820_configure,
        .fetch_size             = intel_8xx_fetch_size,
        .cleanup                = intel_820_cleanup,
        .tlb_flush              = intel_820_tlbflush,
        .mask_memory            = agp_generic_mask_memory,
        .masks                  = intel_generic_masks,
        .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_alloc_pages        = agp_generic_alloc_pages,
        .agp_destroy_page       = agp_generic_destroy_page,
        .agp_destroy_pages      = agp_generic_destroy_pages,
        .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
};

static const struct agp_bridge_driver intel_830mp_driver = {
        .owner                  = THIS_MODULE,
        .aperture_sizes         = intel_830mp_sizes,
        .size_type              = U8_APER_SIZE,
        .num_aperture_sizes     = 4,
        .configure              = intel_830mp_configure,
        .fetch_size             = intel_8xx_fetch_size,
        .cleanup                = intel_8xx_cleanup,
        .tlb_flush              = intel_8xx_tlbflush,
        .mask_memory            = agp_generic_mask_memory,
        .masks                  = intel_generic_masks,
        .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_alloc_pages        = agp_generic_alloc_pages,
        .agp_destroy_page       = agp_generic_destroy_page,
        .agp_destroy_pages      = agp_generic_destroy_pages,
        .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
};

static const struct agp_bridge_driver intel_840_driver = {
        .owner                  = THIS_MODULE,
        .aperture_sizes         = intel_8xx_sizes,
        .size_type              = U8_APER_SIZE,
        .num_aperture_sizes     = 7,
        .configure              = intel_840_configure,
        .fetch_size             = intel_8xx_fetch_size,
        .cleanup                = intel_8xx_cleanup,
        .tlb_flush              = intel_8xx_tlbflush,
        .mask_memory            = agp_generic_mask_memory,
        .masks                  = intel_generic_masks,
        .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_alloc_pages        = agp_generic_alloc_pages,
        .agp_destroy_page       = agp_generic_destroy_page,
        .agp_destroy_pages      = agp_generic_destroy_pages,
        .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
};

static const struct agp_bridge_driver intel_845_driver = {
        .owner                  = THIS_MODULE,
        .aperture_sizes         = intel_8xx_sizes,
        .size_type              = U8_APER_SIZE,
        .num_aperture_sizes     = 7,
        .configure              = intel_845_configure,
        .fetch_size             = intel_8xx_fetch_size,
        .cleanup                = intel_8xx_cleanup,
        .tlb_flush              = intel_8xx_tlbflush,
        .mask_memory            = agp_generic_mask_memory,
        .masks                  = intel_generic_masks,
        .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_alloc_pages        = agp_generic_alloc_pages,
        .agp_destroy_page       = agp_generic_destroy_page,
        .agp_destroy_pages      = agp_generic_destroy_pages,
        .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
        .chipset_flush          = intel_i830_chipset_flush,
};

static const struct agp_bridge_driver intel_850_driver = {
        .owner                  = THIS_MODULE,
        .aperture_sizes         = intel_8xx_sizes,
        .size_type              = U8_APER_SIZE,
        .num_aperture_sizes     = 7,
        .configure              = intel_850_configure,
        .fetch_size             = intel_8xx_fetch_size,
        .cleanup                = intel_8xx_cleanup,
        .tlb_flush              = intel_8xx_tlbflush,
        .mask_memory            = agp_generic_mask_memory,
        .masks                  = intel_generic_masks,
        .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_alloc_pages        = agp_generic_alloc_pages,
        .agp_destroy_page       = agp_generic_destroy_page,
        .agp_destroy_pages      = agp_generic_destroy_pages,
        .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
};

static const struct agp_bridge_driver intel_860_driver = {
        .owner                  = THIS_MODULE,
        .aperture_sizes         = intel_8xx_sizes,
        .size_type              = U8_APER_SIZE,
        .num_aperture_sizes     = 7,
        .configure              = intel_860_configure,
        .fetch_size             = intel_8xx_fetch_size,
        .cleanup                = intel_8xx_cleanup,
        .tlb_flush              = intel_8xx_tlbflush,
        .mask_memory            = agp_generic_mask_memory,
        .masks                  = intel_generic_masks,
        .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_alloc_pages        = agp_generic_alloc_pages,
        .agp_destroy_page       = agp_generic_destroy_page,
        .agp_destroy_pages      = agp_generic_destroy_pages,
        .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
};

static const struct agp_bridge_driver intel_915_driver = {
        .owner                  = THIS_MODULE,
        .aperture_sizes         = intel_i830_sizes,
        .size_type              = FIXED_APER_SIZE,
        .num_aperture_sizes     = 4,
        .needs_scratch_page     = true,
        .configure              = intel_i915_configure,
        .fetch_size             = intel_i9xx_fetch_size,
        .cleanup                = intel_i915_cleanup,
        .tlb_flush              = intel_i810_tlbflush,
        .mask_memory            = intel_i810_mask_memory,
        .masks                  = intel_i810_masks,
        .agp_enable             = intel_i810_agp_enable,
        .cache_flush            = global_cache_flush,
        .create_gatt_table      = intel_i915_create_gatt_table,
        .free_gatt_table        = intel_i830_free_gatt_table,
        .insert_memory          = intel_i915_insert_entries,
        .remove_memory          = intel_i915_remove_entries,
        .alloc_by_type          = intel_i830_alloc_by_type,
        .free_by_type           = intel_i810_free_by_type,
        .agp_alloc_page         = agp_generic_alloc_page,
        .agp_alloc_pages        = agp_generic_alloc_pages,
        .agp_destroy_page       = agp_generic_destroy_page,
        .agp_destroy_pages      = agp_generic_destroy_pages,
        .agp_type_to_mask_type  = intel_i830_type_to_mask_type,
        .chipset_flush          = intel_i915_chipset_flush,

};

static const struct agp_bridge_driver intel_i965_driver = {
        .owner                  = THIS_MODULE,
        .aperture_sizes         = intel_i830_sizes,
        .size_type              = FIXED_APER_SIZE,
        .num_aperture_sizes     = 4,
        .needs_scratch_page     = true,
        .configure              = intel_i915_configure,
        .fetch_size             = intel_i9xx_fetch_size,
        .cleanup                = intel_i915_cleanup,
        .tlb_flush              = intel_i810_tlbflush,
        .mask_memory            = intel_i965_mask_memory,
        .masks                  = intel_i810_masks,
        .agp_enable             = intel_i810_agp_enable,
        .cache_flush            = global_cache_flush,
        .create_gatt_table      = intel_i965_create_gatt_table,
        .free_gatt_table        = intel_i830_free_gatt_table,
        .insert_memory          = intel_i915_insert_entries,
        .remove_memory          = intel_i915_remove_entries,
        .alloc_by_type          = intel_i830_alloc_by_type,
        .free_by_type           = intel_i810_free_by_type,
        .agp_alloc_page         = agp_generic_alloc_page,
        .agp_alloc_pages        = agp_generic_alloc_pages,
        .agp_destroy_page       = agp_generic_destroy_page,
        .agp_destroy_pages      = agp_generic_destroy_pages,
        .agp_type_to_mask_type  = intel_i830_type_to_mask_type,
        .chipset_flush          = intel_i915_chipset_flush,
};

static const struct agp_bridge_driver intel_7505_driver = {
        .owner                  = THIS_MODULE,
        .aperture_sizes         = intel_8xx_sizes,
        .size_type              = U8_APER_SIZE,
        .num_aperture_sizes     = 7,
        .configure              = intel_7505_configure,
        .fetch_size             = intel_8xx_fetch_size,
        .cleanup                = intel_8xx_cleanup,
        .tlb_flush              = intel_8xx_tlbflush,
        .mask_memory            = agp_generic_mask_memory,
        .masks                  = intel_generic_masks,
        .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_alloc_pages        = agp_generic_alloc_pages,
        .agp_destroy_page       = agp_generic_destroy_page,
        .agp_destroy_pages      = agp_generic_destroy_pages,
        .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
};

static const struct agp_bridge_driver intel_g33_driver = {
        .owner                  = THIS_MODULE,
        .aperture_sizes         = intel_i830_sizes,
        .size_type              = FIXED_APER_SIZE,
        .num_aperture_sizes     = 4,
        .needs_scratch_page     = true,
        .configure              = intel_i915_configure,
        .fetch_size             = intel_i9xx_fetch_size,
        .cleanup                = intel_i915_cleanup,
        .tlb_flush              = intel_i810_tlbflush,
        .mask_memory            = intel_i965_mask_memory,
        .masks                  = intel_i810_masks,
        .agp_enable             = intel_i810_agp_enable,
        .cache_flush            = global_cache_flush,
        .create_gatt_table      = intel_i915_create_gatt_table,
        .free_gatt_table        = intel_i830_free_gatt_table,
        .insert_memory          = intel_i915_insert_entries,
        .remove_memory          = intel_i915_remove_entries,
        .alloc_by_type          = intel_i830_alloc_by_type,
        .free_by_type           = intel_i810_free_by_type,
        .agp_alloc_page         = agp_generic_alloc_page,
        .agp_alloc_pages        = agp_generic_alloc_pages,
        .agp_destroy_page       = agp_generic_destroy_page,
        .agp_destroy_pages      = agp_generic_destroy_pages,
        .agp_type_to_mask_type  = intel_i830_type_to_mask_type,
        .chipset_flush          = intel_i915_chipset_flush,
};

static int find_gmch(u16 device)
{
        struct pci_dev *gmch_device;

        gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL, device, NULL);
        if (gmch_device && PCI_FUNC(gmch_device->devfn) != 0) {
                gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL,
                                             device, gmch_device);
        }

        if (!gmch_device)
                return 0;

        intel_private.pcidev = gmch_device;
        return 1;
}

/* Table to describe Intel GMCH and AGP/PCIE GART drivers.  At least one of
 * driver and gmch_driver must be non-null, and find_gmch will determine
 * which one should be used if a gmch_chip_id is present.
 */
static const struct intel_driver_description {
        unsigned int chip_id;
        unsigned int gmch_chip_id;
        unsigned int multi_gmch_chip; /* if we have more gfx chip type on this HB. */
        char *name;
        const struct agp_bridge_driver *driver;
        const struct agp_bridge_driver *gmch_driver;
} intel_agp_chipsets[] = {
        { PCI_DEVICE_ID_INTEL_82443LX_0, 0, 0, "440LX", &intel_generic_driver, NULL },
        { PCI_DEVICE_ID_INTEL_82443BX_0, 0, 0, "440BX", &intel_generic_driver, NULL },
        { PCI_DEVICE_ID_INTEL_82443GX_0, 0, 0, "440GX", &intel_generic_driver, NULL },
        { PCI_DEVICE_ID_INTEL_82810_MC1, PCI_DEVICE_ID_INTEL_82810_IG1, 0, "i810",
                NULL, &intel_810_driver },
        { PCI_DEVICE_ID_INTEL_82810_MC3, PCI_DEVICE_ID_INTEL_82810_IG3, 0, "i810",
                NULL, &intel_810_driver },
        { PCI_DEVICE_ID_INTEL_82810E_MC, PCI_DEVICE_ID_INTEL_82810E_IG, 0, "i810",
                NULL, &intel_810_driver },
        { PCI_DEVICE_ID_INTEL_82815_MC, PCI_DEVICE_ID_INTEL_82815_CGC, 0, "i815",
                &intel_815_driver, &intel_810_driver },
        { PCI_DEVICE_ID_INTEL_82820_HB, 0, 0, "i820", &intel_820_driver, NULL },
        { PCI_DEVICE_ID_INTEL_82820_UP_HB, 0, 0, "i820", &intel_820_driver, NULL },
        { PCI_DEVICE_ID_INTEL_82830_HB, PCI_DEVICE_ID_INTEL_82830_CGC, 0, "830M",
                &intel_830mp_driver, &intel_830_driver },
        { PCI_DEVICE_ID_INTEL_82840_HB, 0, 0, "i840", &intel_840_driver, NULL },
        { PCI_DEVICE_ID_INTEL_82845_HB, 0, 0, "845G", &intel_845_driver, NULL },
        { PCI_DEVICE_ID_INTEL_82845G_HB, PCI_DEVICE_ID_INTEL_82845G_IG, 0, "830M",
                &intel_845_driver, &intel_830_driver },
        { PCI_DEVICE_ID_INTEL_82850_HB, 0, 0, "i850", &intel_850_driver, NULL },
        { PCI_DEVICE_ID_INTEL_82854_HB, PCI_DEVICE_ID_INTEL_82854_IG, 0, "854",
                &intel_845_driver, &intel_830_driver },
        { PCI_DEVICE_ID_INTEL_82855PM_HB, 0, 0, "855PM", &intel_845_driver, NULL },
        { PCI_DEVICE_ID_INTEL_82855GM_HB, PCI_DEVICE_ID_INTEL_82855GM_IG, 0, "855GM",
                &intel_845_driver, &intel_830_driver },
        { PCI_DEVICE_ID_INTEL_82860_HB, 0, 0, "i860", &intel_860_driver, NULL },
        { PCI_DEVICE_ID_INTEL_82865_HB, PCI_DEVICE_ID_INTEL_82865_IG, 0, "865",
                &intel_845_driver, &intel_830_driver },
        { PCI_DEVICE_ID_INTEL_82875_HB, 0, 0, "i875", &intel_845_driver, NULL },
        { PCI_DEVICE_ID_INTEL_E7221_HB, PCI_DEVICE_ID_INTEL_E7221_IG, 0, "E7221 (i915)",
                NULL, &intel_915_driver },
        { PCI_DEVICE_ID_INTEL_82915G_HB, PCI_DEVICE_ID_INTEL_82915G_IG, 0, "915G",
                NULL, &intel_915_driver },
        { PCI_DEVICE_ID_INTEL_82915GM_HB, PCI_DEVICE_ID_INTEL_82915GM_IG, 0, "915GM",
                NULL, &intel_915_driver },
        { PCI_DEVICE_ID_INTEL_82945G_HB, PCI_DEVICE_ID_INTEL_82945G_IG, 0, "945G",
                NULL, &intel_915_driver },
        { PCI_DEVICE_ID_INTEL_82945GM_HB, PCI_DEVICE_ID_INTEL_82945GM_IG, 0, "945GM",
                NULL, &intel_915_driver },
        { PCI_DEVICE_ID_INTEL_82945GME_HB, PCI_DEVICE_ID_INTEL_82945GME_IG, 0, "945GME",
                NULL, &intel_915_driver },
        { PCI_DEVICE_ID_INTEL_82946GZ_HB, PCI_DEVICE_ID_INTEL_82946GZ_IG, 0, "946GZ",
                NULL, &intel_i965_driver },
        { PCI_DEVICE_ID_INTEL_82G35_HB, PCI_DEVICE_ID_INTEL_82G35_IG, 0, "G35",
                NULL, &intel_i965_driver },
        { PCI_DEVICE_ID_INTEL_82965Q_HB, PCI_DEVICE_ID_INTEL_82965Q_IG, 0, "965Q",
                NULL, &intel_i965_driver },
        { PCI_DEVICE_ID_INTEL_82965G_HB, PCI_DEVICE_ID_INTEL_82965G_IG, 0, "965G",
                NULL, &intel_i965_driver },
        { PCI_DEVICE_ID_INTEL_82965GM_HB, PCI_DEVICE_ID_INTEL_82965GM_IG, 0, "965GM",
                NULL, &intel_i965_driver },
        { PCI_DEVICE_ID_INTEL_82965GME_HB, PCI_DEVICE_ID_INTEL_82965GME_IG, 0, "965GME/GLE",
                NULL, &intel_i965_driver },
        { PCI_DEVICE_ID_INTEL_7505_0, 0, 0, "E7505", &intel_7505_driver, NULL },
        { PCI_DEVICE_ID_INTEL_7205_0, 0, 0, "E7205", &intel_7505_driver, NULL },
        { PCI_DEVICE_ID_INTEL_G33_HB, PCI_DEVICE_ID_INTEL_G33_IG, 0, "G33",
                NULL, &intel_g33_driver },
        { PCI_DEVICE_ID_INTEL_Q35_HB, PCI_DEVICE_ID_INTEL_Q35_IG, 0, "Q35",
                NULL, &intel_g33_driver },
        { PCI_DEVICE_ID_INTEL_Q33_HB, PCI_DEVICE_ID_INTEL_Q33_IG, 0, "Q33",
                NULL, &intel_g33_driver },
        { PCI_DEVICE_ID_INTEL_IGDGM_HB, PCI_DEVICE_ID_INTEL_IGDGM_IG, 0, "IGD",
                NULL, &intel_g33_driver },
        { PCI_DEVICE_ID_INTEL_IGDG_HB, PCI_DEVICE_ID_INTEL_IGDG_IG, 0, "IGD",
                NULL, &intel_g33_driver },
        { PCI_DEVICE_ID_INTEL_GM45_HB, PCI_DEVICE_ID_INTEL_GM45_IG, 0,
            "Mobile Intel® GM45 Express", NULL, &intel_i965_driver },
        { PCI_DEVICE_ID_INTEL_IGD_E_HB, PCI_DEVICE_ID_INTEL_IGD_E_IG, 0,
            "Intel Integrated Graphics Device", NULL, &intel_i965_driver },
        { PCI_DEVICE_ID_INTEL_Q45_HB, PCI_DEVICE_ID_INTEL_Q45_IG, 0,
            "Q45/Q43", NULL, &intel_i965_driver },
        { PCI_DEVICE_ID_INTEL_G45_HB, PCI_DEVICE_ID_INTEL_G45_IG, 0,
            "G45/G43", NULL, &intel_i965_driver },
        { PCI_DEVICE_ID_INTEL_G41_HB, PCI_DEVICE_ID_INTEL_G41_IG, 0,
            "G41", NULL, &intel_i965_driver },
        { 0, 0, 0, NULL, NULL, NULL }
};

static int __devinit agp_intel_probe(struct pci_dev *pdev,
                                     const struct pci_device_id *ent)
{
        struct agp_bridge_data *bridge;
        u8 cap_ptr = 0;
        struct resource *r;
        int i;

        cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);

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

        for (i = 0; intel_agp_chipsets[i].name != NULL; i++) {
                /* In case that multiple models of gfx chip may
                   stand on same host bridge type, this can be
                   sure we detect the right IGD. */
                if (pdev->device == intel_agp_chipsets[i].chip_id) {
                        if ((intel_agp_chipsets[i].gmch_chip_id != 0) &&
                                find_gmch(intel_agp_chipsets[i].gmch_chip_id)) {
                                bridge->driver =
                                        intel_agp_chipsets[i].gmch_driver;
                                break;
                        } else if (intel_agp_chipsets[i].multi_gmch_chip) {
                                continue;
                        } else {
                                bridge->driver = intel_agp_chipsets[i].driver;
                                break;
                        }
                }
        }

        if (intel_agp_chipsets[i].name == NULL) {
                if (cap_ptr)
                        dev_warn(&pdev->dev, "unsupported Intel chipset [%04x/%04x]\n",
                                 pdev->vendor, pdev->device);
                agp_put_bridge(bridge);
                return -ENODEV;
        }

        if (bridge->driver == NULL) {
                /* bridge has no AGP and no IGD detected */
                if (cap_ptr)
                        dev_warn(&pdev->dev, "can't find bridge device (chip_id: %04x)\n",
                                 intel_agp_chipsets[i].gmch_chip_id);
                agp_put_bridge(bridge);
                return -ENODEV;
        }

        bridge->dev = pdev;
        bridge->capndx = cap_ptr;
        bridge->dev_private_data = &intel_private;

        dev_info(&pdev->dev, "Intel %s Chipset\n", intel_agp_chipsets[i].name);

        /*
        * The following fixes the case where the BIOS has "forgotten" to
        * provide an address range for the GART.
        * 20030610 - hamish@zot.org
        */
        r = &pdev->resource[0];
        if (!r->start && r->end) {
                if (pci_assign_resource(pdev, 0)) {
                        dev_err(&pdev->dev, "can't assign resource 0\n");
                        agp_put_bridge(bridge);
                        return -ENODEV;
                }
        }

        /*
        * If the device has not been properly setup, the following will catch
        * the problem and should stop the system from crashing.
        * 20030610 - hamish@zot.org
        */
        if (pci_enable_device(pdev)) {
                dev_err(&pdev->dev, "can't enable PCI device\n");
                agp_put_bridge(bridge);
                return -ENODEV;
        }

        /* Fill in the mode register */
        if (cap_ptr) {
                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_intel_remove(struct pci_dev *pdev)
{
        struct agp_bridge_data *bridge = pci_get_drvdata(pdev);

        agp_remove_bridge(bridge);

        if (intel_private.pcidev)
                pci_dev_put(intel_private.pcidev);

        agp_put_bridge(bridge);
}

#ifdef CONFIG_PM
static int agp_intel_resume(struct pci_dev *pdev)
{
        struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
        int ret_val;

        if (bridge->driver == &intel_generic_driver)
                intel_configure();
        else if (bridge->driver == &intel_850_driver)
                intel_850_configure();
        else if (bridge->driver == &intel_845_driver)
                intel_845_configure();
        else if (bridge->driver == &intel_830mp_driver)
                intel_830mp_configure();
        else if (bridge->driver == &intel_915_driver)
                intel_i915_configure();
        else if (bridge->driver == &intel_830_driver)
                intel_i830_configure();
        else if (bridge->driver == &intel_810_driver)
                intel_i810_configure();
        else if (bridge->driver == &intel_i965_driver)
                intel_i915_configure();

        ret_val = agp_rebind_memory();
        if (ret_val != 0)
                return ret_val;

        return 0;
}
#endif

static struct pci_device_id agp_intel_pci_table[] = {
#define ID(x)                                           \
        {                                               \
        .class          = (PCI_CLASS_BRIDGE_HOST << 8), \
        .class_mask     = ~0,                           \
        .vendor         = PCI_VENDOR_ID_INTEL,          \
        .device         = x,                            \
        .subvendor      = PCI_ANY_ID,                   \
        .subdevice      = PCI_ANY_ID,                   \
        }
        ID(PCI_DEVICE_ID_INTEL_82443LX_0),
        ID(PCI_DEVICE_ID_INTEL_82443BX_0),
        ID(PCI_DEVICE_ID_INTEL_82443GX_0),
        ID(PCI_DEVICE_ID_INTEL_82810_MC1),
        ID(PCI_DEVICE_ID_INTEL_82810_MC3),
        ID(PCI_DEVICE_ID_INTEL_82810E_MC),
        ID(PCI_DEVICE_ID_INTEL_82815_MC),
        ID(PCI_DEVICE_ID_INTEL_82820_HB),
        ID(PCI_DEVICE_ID_INTEL_82820_UP_HB),
        ID(PCI_DEVICE_ID_INTEL_82830_HB),
        ID(PCI_DEVICE_ID_INTEL_82840_HB),
        ID(PCI_DEVICE_ID_INTEL_82845_HB),
        ID(PCI_DEVICE_ID_INTEL_82845G_HB),
        ID(PCI_DEVICE_ID_INTEL_82850_HB),
        ID(PCI_DEVICE_ID_INTEL_82854_HB),
        ID(PCI_DEVICE_ID_INTEL_82855PM_HB),
        ID(PCI_DEVICE_ID_INTEL_82855GM_HB),
        ID(PCI_DEVICE_ID_INTEL_82860_HB),
        ID(PCI_DEVICE_ID_INTEL_82865_HB),
        ID(PCI_DEVICE_ID_INTEL_82875_HB),
        ID(PCI_DEVICE_ID_INTEL_7505_0),
        ID(PCI_DEVICE_ID_INTEL_7205_0),
        ID(PCI_DEVICE_ID_INTEL_E7221_HB),
        ID(PCI_DEVICE_ID_INTEL_82915G_HB),
        ID(PCI_DEVICE_ID_INTEL_82915GM_HB),
        ID(PCI_DEVICE_ID_INTEL_82945G_HB),
        ID(PCI_DEVICE_ID_INTEL_82945GM_HB),
        ID(PCI_DEVICE_ID_INTEL_82945GME_HB),
        ID(PCI_DEVICE_ID_INTEL_IGDGM_HB),
        ID(PCI_DEVICE_ID_INTEL_IGDG_HB),
        ID(PCI_DEVICE_ID_INTEL_82946GZ_HB),
        ID(PCI_DEVICE_ID_INTEL_82G35_HB),
        ID(PCI_DEVICE_ID_INTEL_82965Q_HB),
        ID(PCI_DEVICE_ID_INTEL_82965G_HB),
        ID(PCI_DEVICE_ID_INTEL_82965GM_HB),
        ID(PCI_DEVICE_ID_INTEL_82965GME_HB),
        ID(PCI_DEVICE_ID_INTEL_G33_HB),
        ID(PCI_DEVICE_ID_INTEL_Q35_HB),
        ID(PCI_DEVICE_ID_INTEL_Q33_HB),
        ID(PCI_DEVICE_ID_INTEL_GM45_HB),
        ID(PCI_DEVICE_ID_INTEL_IGD_E_HB),
        ID(PCI_DEVICE_ID_INTEL_Q45_HB),
        ID(PCI_DEVICE_ID_INTEL_G45_HB),
        ID(PCI_DEVICE_ID_INTEL_G41_HB),
        { }
};

MODULE_DEVICE_TABLE(pci, agp_intel_pci_table);

static struct pci_driver agp_intel_pci_driver = {
        .name           = "agpgart-intel",
        .id_table       = agp_intel_pci_table,
        .probe          = agp_intel_probe,
        .remove         = __devexit_p(agp_intel_remove),
#ifdef CONFIG_PM
        .resume         = agp_intel_resume,
#endif
};

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

static void __exit agp_intel_cleanup(void)
{
        pci_unregister_driver(&agp_intel_pci_driver);
}

module_init(agp_intel_init);
module_exit(agp_intel_cleanup);

MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
MODULE_LICENSE("GPL and additional rights");