1 files changed, 542 insertions, 0 deletions

diff --git a/drivers/char/agp/amd-k7-agp.c b/drivers/char/agp/amd-k7-agp.c
new file mode 100644
index 000000000000..f1ea87ea6b65
--- /dev/null
+++ b/drivers/char/agp/amd-k7-agp.c
@@ -0,0 +1,542 @@
+/*
+ * AMD K7 AGPGART routines.
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/agp_backend.h>
+#include <linux/gfp.h>
+#include <linux/page-flags.h>
+#include <linux/mm.h>
+#include "agp.h"
+
+#define AMD_MMBASE      0x14
+#define AMD_APSIZE      0xac
+#define AMD_MODECNTL    0xb0
+#define AMD_MODECNTL2   0xb2
+#define AMD_GARTENABLE  0x02    /* In mmio region (16-bit register) */
+#define AMD_ATTBASE     0x04    /* In mmio region (32-bit register) */
+#define AMD_TLBFLUSH    0x0c    /* In mmio region (32-bit register) */
+#define AMD_CACHEENTRY  0x10    /* In mmio region (32-bit register) */
+
+static struct pci_device_id agp_amdk7_pci_table[];
+
+struct amd_page_map {
+        unsigned long *real;
+        unsigned long __iomem *remapped;
+};
+
+static struct _amd_irongate_private {
+        volatile u8 __iomem *registers;
+        struct amd_page_map **gatt_pages;
+        int num_tables;
+} amd_irongate_private;
+
+static int amd_create_page_map(struct amd_page_map *page_map)
+{
+        int i;
+
+        page_map->real = (unsigned long *) __get_free_page(GFP_KERNEL);
+        if (page_map->real == NULL)
+                return -ENOMEM;
+
+        SetPageReserved(virt_to_page(page_map->real));
+        global_cache_flush();
+        page_map->remapped = ioremap_nocache(virt_to_phys(page_map->real),
+                                            PAGE_SIZE);
+        if (page_map->remapped == NULL) {
+                ClearPageReserved(virt_to_page(page_map->real));
+                free_page((unsigned long) page_map->real);
+                page_map->real = NULL;
+                return -ENOMEM;
+        }
+        global_cache_flush();
+
+        for (i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++) {
+                writel(agp_bridge->scratch_page, page_map->remapped+i);
+                readl(page_map->remapped+i);    /* PCI Posting. */
+        }
+
+        return 0;
+}
+
+static void amd_free_page_map(struct amd_page_map *page_map)
+{
+        iounmap(page_map->remapped);
+        ClearPageReserved(virt_to_page(page_map->real));
+        free_page((unsigned long) page_map->real);
+}
+
+static void amd_free_gatt_pages(void)
+{
+        int i;
+        struct amd_page_map **tables;
+        struct amd_page_map *entry;
+
+        tables = amd_irongate_private.gatt_pages;
+        for (i = 0; i < amd_irongate_private.num_tables; i++) {
+                entry = tables[i];
+                if (entry != NULL) {
+                        if (entry->real != NULL)
+                                amd_free_page_map(entry);
+                        kfree(entry);
+                }
+        }
+        kfree(tables);
+        amd_irongate_private.gatt_pages = NULL;
+}
+
+static int amd_create_gatt_pages(int nr_tables)
+{
+        struct amd_page_map **tables;
+        struct amd_page_map *entry;
+        int retval = 0;
+        int i;
+
+        tables = kmalloc((nr_tables + 1) * sizeof(struct amd_page_map *),
+                         GFP_KERNEL);
+        if (tables == NULL)
+                return -ENOMEM;
+
+        memset (tables, 0, sizeof(struct amd_page_map *) * (nr_tables + 1));
+        for (i = 0; i < nr_tables; i++) {
+                entry = kmalloc(sizeof(struct amd_page_map), GFP_KERNEL);
+                if (entry == NULL) {
+                        retval = -ENOMEM;
+                        break;
+                }
+                memset (entry, 0, sizeof(struct amd_page_map));
+                tables[i] = entry;
+                retval = amd_create_page_map(entry);
+                if (retval != 0)
+                        break;
+        }
+        amd_irongate_private.num_tables = nr_tables;
+        amd_irongate_private.gatt_pages = tables;
+
+        if (retval != 0)
+                amd_free_gatt_pages();
+
+        return retval;
+}
+
+/* Since we don't need contigious 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)
+#define GET_GATT(addr) (amd_irongate_private.gatt_pages[\
+        GET_PAGE_DIR_IDX(addr)]->remapped)
+
+static int amd_create_gatt_table(struct agp_bridge_data *bridge)
+{
+        struct aper_size_info_lvl2 *value;
+        struct amd_page_map page_dir;
+        unsigned long addr;
+        int retval;
+        u32 temp;
+        int i;
+
+        value = A_SIZE_LVL2(agp_bridge->current_size);
+        retval = amd_create_page_map(&page_dir);
+        if (retval != 0)
+                return retval;
+
+        retval = amd_create_gatt_pages(value->num_entries / 1024);
+        if (retval != 0) {
+                amd_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);
+
+        /* 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(amd_irongate_private.gatt_pages[i]->real) | 1,
+                        page_dir.remapped+GET_PAGE_DIR_OFF(addr));
+                readl(page_dir.remapped+GET_PAGE_DIR_OFF(addr));        /* PCI Posting. */
+        }
+
+        return 0;
+}
+
+static int amd_free_gatt_table(struct agp_bridge_data *bridge)
+{
+        struct amd_page_map page_dir;
+
+        page_dir.real = (unsigned long *)agp_bridge->gatt_table_real;
+        page_dir.remapped = (unsigned long __iomem *)agp_bridge->gatt_table;
+
+        amd_free_gatt_pages();
+        amd_free_page_map(&page_dir);
+        return 0;
+}
+
+static int amd_irongate_fetch_size(void)
+{
+        int i;
+        u32 temp;
+        struct aper_size_info_lvl2 *values;
+
+        pci_read_config_dword(agp_bridge->dev, AMD_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 int amd_irongate_configure(void)
+{
+        struct aper_size_info_lvl2 *current_size;
+        u32 temp;
+        u16 enable_reg;
+
+        current_size = A_SIZE_LVL2(agp_bridge->current_size);
+
+        /* Get the memory mapped registers */
+        pci_read_config_dword(agp_bridge->dev, AMD_MMBASE, &temp);
+        temp = (temp & PCI_BASE_ADDRESS_MEM_MASK);
+        amd_irongate_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
+
+        /* Write out the address of the gatt table */
+        writel(agp_bridge->gatt_bus_addr, amd_irongate_private.registers+AMD_ATTBASE);
+        readl(amd_irongate_private.registers+AMD_ATTBASE);      /* PCI Posting. */
+
+        /* Write the Sync register */
+        pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL, 0x80);
+
+        /* Set indexing mode */
+        pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL2, 0x00);
+
+        /* Write the enable register */
+        enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
+        enable_reg = (enable_reg | 0x0004);
+        writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
+        readw(amd_irongate_private.registers+AMD_GARTENABLE);   /* PCI Posting. */
+
+        /* Write out the size register */
+        pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
+        temp = (((temp & ~(0x0000000e)) | current_size->size_value) | 1);
+        pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
+
+        /* Flush the tlb */
+        writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
+        readl(amd_irongate_private.registers+AMD_TLBFLUSH);     /* PCI Posting.*/
+        return 0;
+}
+
+static void amd_irongate_cleanup(void)
+{
+        struct aper_size_info_lvl2 *previous_size;
+        u32 temp;
+        u16 enable_reg;
+
+        previous_size = A_SIZE_LVL2(agp_bridge->previous_size);
+
+        enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
+        enable_reg = (enable_reg & ~(0x0004));
+        writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
+        readw(amd_irongate_private.registers+AMD_GARTENABLE);   /* PCI Posting. */
+
+        /* Write back the previous size and disable gart translation */
+        pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
+        temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
+        pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
+        iounmap((void __iomem *) amd_irongate_private.registers);
+}
+
+/*
+ * This routine could be implemented by taking the addresses
+ * written to the GATT, and flushing them individually.  However
+ * currently it just flushes the whole table.  Which is probably
+ * more efficent, since agp_memory blocks can be a large number of
+ * entries.
+ */
+
+static void amd_irongate_tlbflush(struct agp_memory *temp)
+{
+        writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
+        readl(amd_irongate_private.registers+AMD_TLBFLUSH);     /* PCI Posting. */
+}
+
+static int amd_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
+{
+        int i, j, num_entries;
+        unsigned long __iomem *cur_gatt;
+        unsigned long addr;
+
+        num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
+
+        if (type != 0 || mem->type != 0)
+                return -EINVAL;
+
+        if ((pg_start + mem->page_count) > num_entries)
+                return -EINVAL;
+
+        j = pg_start;
+        while (j < (pg_start + mem->page_count)) {
+                addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
+                cur_gatt = GET_GATT(addr);
+                if (!PGE_EMPTY(agp_bridge, readl(cur_gatt+GET_GATT_OFF(addr))))
+                        return -EBUSY;
+                j++;
+        }
+
+        if (mem->is_flushed == FALSE) {
+                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_generic_mask_memory(agp_bridge,
+                        mem->memory[i], mem->type), cur_gatt+GET_GATT_OFF(addr));
+                readl(cur_gatt+GET_GATT_OFF(addr));     /* PCI Posting. */
+        }
+        amd_irongate_tlbflush(mem);
+        return 0;
+}
+
+static int amd_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
+{
+        int i;
+        unsigned long __iomem *cur_gatt;
+        unsigned long addr;
+
+        if (type != 0 || mem->type != 0)
+                return -EINVAL;
+
+        for (i = pg_start; i < (mem->page_count + pg_start); i++) {
+                addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
+                cur_gatt = GET_GATT(addr);
+                writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
+                readl(cur_gatt+GET_GATT_OFF(addr));     /* PCI Posting. */
+        }
+
+        amd_irongate_tlbflush(mem);
+        return 0;
+}
+
+static struct aper_size_info_lvl2 amd_irongate_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 amd_irongate_masks[] =
+{
+        {.mask = 1, .type = 0}
+};
+
+struct agp_bridge_driver amd_irongate_driver = {
+        .owner                  = THIS_MODULE,
+        .aperture_sizes         = amd_irongate_sizes,
+        .size_type              = LVL2_APER_SIZE,
+        .num_aperture_sizes     = 7,
+        .configure              = amd_irongate_configure,
+        .fetch_size             = amd_irongate_fetch_size,
+        .cleanup                = amd_irongate_cleanup,
+        .tlb_flush              = amd_irongate_tlbflush,
+        .mask_memory            = agp_generic_mask_memory,
+        .masks                  = amd_irongate_masks,
+        .agp_enable             = agp_generic_enable,
+        .cache_flush            = global_cache_flush,
+        .create_gatt_table      = amd_create_gatt_table,
+        .free_gatt_table        = amd_free_gatt_table,
+        .insert_memory          = amd_insert_memory,
+        .remove_memory          = amd_remove_memory,
+        .alloc_by_type          = agp_generic_alloc_by_type,
+        .free_by_type           = agp_generic_free_by_type,
+        .agp_alloc_page         = agp_generic_alloc_page,
+        .agp_destroy_page       = agp_generic_destroy_page,
+};
+
+static struct agp_device_ids amd_agp_device_ids[] __devinitdata =
+{
+        {
+                .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_7006,
+                .chipset_name   = "Irongate",
+        },
+        {
+                .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_700E,
+                .chipset_name   = "761",
+        },
+        {
+                .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_700C,
+                .chipset_name   = "760MP",
+        },
+        { }, /* dummy final entry, always present */
+};
+
+static int __devinit agp_amdk7_probe(struct pci_dev *pdev,
+                                     const struct pci_device_id *ent)
+{
+        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;
+
+        j = ent - agp_amdk7_pci_table;
+        printk(KERN_INFO PFX "Detected AMD %s chipset\n",
+               amd_agp_device_ids[j].chipset_name);
+
+        bridge = agp_alloc_bridge();
+        if (!bridge)
+                return -ENOMEM;
+
+        bridge->driver = &amd_irongate_driver;
+        bridge->dev_private_data = &amd_irongate_private,
+        bridge->dev = pdev;
+        bridge->capndx = cap_ptr;
+
+        /* 751 Errata (22564_B-1.PDF)
+           erratum 20: strobe glitch with Nvidia NV10 GeForce cards.
+           system controller may experience noise due to strong drive strengths
+         */
+        if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_7006) {
+                u8 cap_ptr=0;
+                struct pci_dev *gfxcard=NULL;
+                while (!cap_ptr) {
+                        gfxcard = pci_get_class(PCI_CLASS_DISPLAY_VGA<<8, gfxcard);
+                        if (!gfxcard) {
+                                printk (KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
+                                return -ENODEV;
+                        }
+                        cap_ptr = pci_find_capability(gfxcard, PCI_CAP_ID_AGP);
+                        if (!cap_ptr) {
+                                pci_dev_put(gfxcard);
+                                continue;
+                        }
+                }
+
+                /* With so many variants of NVidia cards, it's simpler just
+                   to blacklist them all, and then whitelist them as needed
+                   (if necessary at all). */
+                if (gfxcard->vendor == PCI_VENDOR_ID_NVIDIA) {
+                        agp_bridge->flags |= AGP_ERRATA_1X;
+                        printk (KERN_INFO PFX "AMD 751 chipset with NVidia GeForce detected. Forcing to 1X due to errata.\n");
+                }
+                pci_dev_put(gfxcard);
+        }
+
+        /* 761 Errata (23613_F.pdf)
+         * Revisions B0/B1 were a disaster.
+         * erratum 44: SYSCLK/AGPCLK skew causes 2X failures -- Force mode to 1X
+         * erratum 45: Timing problem prevents fast writes -- Disable fast write.
+         * erratum 46: Setup violation on AGP SBA pins - Disable side band addressing.
+         * With this lot disabled, we should prevent lockups. */
+        if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_700E) {
+                u8 revision=0;
+                pci_read_config_byte(pdev, PCI_REVISION_ID, &revision);
+                if (revision == 0x10 || revision == 0x11) {
+                        agp_bridge->flags = AGP_ERRATA_FASTWRITES;
+                        agp_bridge->flags |= AGP_ERRATA_SBA;
+                        agp_bridge->flags |= AGP_ERRATA_1X;
+                        printk (KERN_INFO PFX "AMD 761 chipset with errata detected - disabling AGP fast writes & SBA and forcing to 1X.\n");
+                }
+        }
+
+        /* 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_amdk7_remove(struct pci_dev *pdev)
+{
+        struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
+
+        agp_remove_bridge(bridge);
+        agp_put_bridge(bridge);
+}
+
+/* must be the same order as name table above */
+static struct pci_device_id agp_amdk7_pci_table[] = {
+        {
+        .class          = (PCI_CLASS_BRIDGE_HOST << 8),
+        .class_mask     = ~0,
+        .vendor         = PCI_VENDOR_ID_AMD,
+        .device         = PCI_DEVICE_ID_AMD_FE_GATE_7006,
+        .subvendor      = PCI_ANY_ID,
+        .subdevice      = PCI_ANY_ID,
+        },
+        {
+        .class          = (PCI_CLASS_BRIDGE_HOST << 8),
+        .class_mask     = ~0,
+        .vendor         = PCI_VENDOR_ID_AMD,
+        .device         = PCI_DEVICE_ID_AMD_FE_GATE_700E,
+        .subvendor      = PCI_ANY_ID,
+        .subdevice      = PCI_ANY_ID,
+        },
+        {
+        .class          = (PCI_CLASS_BRIDGE_HOST << 8),
+        .class_mask     = ~0,
+        .vendor         = PCI_VENDOR_ID_AMD,
+        .device         = PCI_DEVICE_ID_AMD_FE_GATE_700C,
+        .subvendor      = PCI_ANY_ID,
+        .subdevice      = PCI_ANY_ID,
+        },
+        { }
+};
+
+MODULE_DEVICE_TABLE(pci, agp_amdk7_pci_table);
+
+static struct pci_driver agp_amdk7_pci_driver = {
+        .name           = "agpgart-amdk7",
+        .id_table       = agp_amdk7_pci_table,
+        .probe          = agp_amdk7_probe,
+        .remove         = agp_amdk7_remove,
+};
+
+static int __init agp_amdk7_init(void)
+{
+        if (agp_off)
+                return -EINVAL;
+        return pci_register_driver(&agp_amdk7_pci_driver);
+}
+
+static void __exit agp_amdk7_cleanup(void)
+{
+        pci_unregister_driver(&agp_amdk7_pci_driver);
+}
+
+module_init(agp_amdk7_init);
+module_exit(agp_amdk7_cleanup);
+
+MODULE_LICENSE("GPL and additional rights");