ati-agp.c

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/*
 * ATi AGPGART routines.
 */

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

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


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

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


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

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

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

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

    set_memory_uc((unsigned long)page_map->real, 1);
    err = map_page_into_agp(virt_to_page(page_map->real));
    page_map->remapped = page_map->real;

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

    return 0;
}


static void ati_free_page_map(struct ati_page_map *page_map)
{
    unmap_page_from_agp(virt_to_page(page_map->real));
    set_memory_wb((unsigned long)page_map->real, 1);
    free_page((unsigned long) page_map->real);
}


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

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


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

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

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

    if (retval != 0)
        ati_free_gatt_pages();

    return retval;
}

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

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

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

    temp = (temp & 0x0000000e);
    values = A_SIZE_LVL2(agp_bridge->driver->aperture_sizes);
    for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
        if (temp == values[i].size_value) {
            agp_bridge->previous_size =
                agp_bridge->current_size = (void *) (values + i);

            agp_bridge->aperture_size_idx = i;
            return values[i].size;
        }
    }

    return 0;
}

static void ati_tlbflush(struct agp_memory * mem)
{
    writel(1, ati_generic_private.registers+ATI_GART_CACHE_CNTRL);
    readl(ati_generic_private.registers+ATI_GART_CACHE_CNTRL);  /* PCI Posting. */
}

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

    previous_size = A_SIZE_LVL2(agp_bridge->previous_size);

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


static int ati_configure(void)
{
    u32 temp;

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

    if (!ati_generic_private.registers)
        return -ENOMEM;

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

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

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

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

    return 0;
}


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

    return 0;
}

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

    return ati_configure();
}
#endif

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

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

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

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

    mask_type = agp_generic_type_to_mask_type(mem->bridge, type);
    if (mask_type != 0 || type != mem->type)
        return -EINVAL;

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

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

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

    if (!mem->is_flushed) {
        /*CACHE_FLUSH(); */
        global_cache_flush();
        mem->is_flushed = true;
    }

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

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

    mask_type = agp_generic_type_to_mask_type(mem->bridge, type);
    if (mask_type != 0 || type != mem->type)
        return -EINVAL;

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

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

    readl(GET_GATT(agp_bridge->gart_bus_addr)); /* PCI posting */
    agp_bridge->driver->tlb_flush(mem);
    return 0;
}

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

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

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

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

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

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

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

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

    for (i = 0; i < value->num_entries; i++) {
        addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
        cur_gatt = GET_GATT(addr);
        writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
    }

    return 0;
}

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

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

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

static const struct agp_bridge_driver ati_generic_bridge = {
    .owner          = THIS_MODULE,
    .aperture_sizes     = ati_generic_sizes,
    .size_type      = LVL2_APER_SIZE,
    .num_aperture_sizes = 7,
    .needs_scratch_page = true,
    .configure      = ati_configure,
    .fetch_size     = ati_fetch_size,
    .cleanup        = ati_cleanup,
    .tlb_flush      = ati_tlbflush,
    .mask_memory        = agp_generic_mask_memory,
    .masks          = ati_generic_masks,
    .agp_enable     = agp_generic_enable,
    .cache_flush        = global_cache_flush,
    .create_gatt_table  = ati_create_gatt_table,
    .free_gatt_table    = ati_free_gatt_table,
    .insert_memory      = ati_insert_memory,
    .remove_memory      = ati_remove_memory,
    .alloc_by_type      = agp_generic_alloc_by_type,
    .free_by_type       = agp_generic_free_by_type,
    .agp_alloc_page     = agp_generic_alloc_page,
    .agp_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 struct agp_device_ids ati_agp_device_ids[] __devinitdata =
{
    {
        .device_id  = PCI_DEVICE_ID_ATI_RS100,
        .chipset_name   = "IGP320/M",
    },
    {
        .device_id  = PCI_DEVICE_ID_ATI_RS200,
        .chipset_name   = "IGP330/340/345/350/M",
    },
    {
        .device_id  = PCI_DEVICE_ID_ATI_RS200_B,
        .chipset_name   = "IGP345M",
    },
    {
        .device_id  = PCI_DEVICE_ID_ATI_RS250,
        .chipset_name   = "IGP7000/M",
    },
    {
        .device_id  = PCI_DEVICE_ID_ATI_RS300_100,
        .chipset_name   = "IGP9100/M",
    },
    {
        .device_id  = PCI_DEVICE_ID_ATI_RS300_133,
        .chipset_name   = "IGP9100/M",
    },
    {
        .device_id  = PCI_DEVICE_ID_ATI_RS300_166,
        .chipset_name   = "IGP9100/M",
    },
    {
        .device_id  = PCI_DEVICE_ID_ATI_RS300_200,
        .chipset_name   = "IGP9100/M",
    },
    {
        .device_id  = PCI_DEVICE_ID_ATI_RS350_133,
        .chipset_name   = "IGP9000/M",
    },
    {
        .device_id  = PCI_DEVICE_ID_ATI_RS350_200,
        .chipset_name   = "IGP9100/M",
    },
    { }, /* dummy final entry, always present */
};

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

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

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

    dev_err(&pdev->dev, "unsupported Ati chipset [%04x/%04x])\n",
        pdev->vendor, pdev->device);
    return -ENODEV;

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

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

    bridge->driver = &ati_generic_bridge;

    dev_info(&pdev->dev, "Ati %s chipset\n", devs[j].chipset_name);

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

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

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

    agp_remove_bridge(bridge);
    agp_put_bridge(bridge);
}

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

MODULE_DEVICE_TABLE(pci, agp_ati_pci_table);

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

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

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

module_init(agp_ati_init);
module_exit(agp_ati_cleanup);

MODULE_AUTHOR("Dave Jones <[email protected]>");
MODULE_LICENSE("GPL and additional rights");