--- /dev/null
+/*
+ * Transmeta's Efficeon AGPGART driver.
+ *
+ * Based upon a diff by Linus around November '02.
+ *
+ * Ported to the 2.6 kernel by Carlos Puchol <cpglinux@puchol.com>
+ * and H. Peter Anvin <hpa@transmeta.com>.
+ */
+
+/*
+ * NOTE-cpg-040217:
+ *
+ * - when compiled as a module, after loading the module,
+ * it will refuse to unload, indicating it is in use,
+ * when it is not.
+ * - no s3 (suspend to ram) testing.
+ * - tested on the efficeon integrated nothbridge for tens
+ * of iterations of starting x and glxgears.
+ * - tested with radeon 9000 and radeon mobility m9 cards
+ * - tested with c3/c4 enabled (with the mobility m9 card)
+ */
+
+#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"
+#include "intel-agp.h"
+
+/*
+ * The real differences to the generic AGP code is
+ * in the GART mappings - a two-level setup with the
+ * first level being an on-chip 64-entry table.
+ *
+ * The page array is filled through the ATTPAGE register
+ * (Aperture Translation Table Page Register) at 0xB8. Bits:
+ * 31:20: physical page address
+ * 11:9: Page Attribute Table Index (PATI)
+ * must match the PAT index for the
+ * mapped pages (the 2nd level page table pages
+ * themselves should be just regular WB-cacheable,
+ * so this is normally zero.)
+ * 8: Present
+ * 7:6: reserved, write as zero
+ * 5:0: GATT directory index: which 1st-level entry
+ *
+ * The Efficeon AGP spec requires pages to be WB-cacheable
+ * but to be explicitly CLFLUSH'd after any changes.
+ */
+#define EFFICEON_ATTPAGE 0xb8
+#define EFFICEON_L1_SIZE 64 /* Number of PDE pages */
+
+#define EFFICEON_PATI (0 << 9)
+#define EFFICEON_PRESENT (1 << 8)
+
+static struct _efficeon_private {
+ unsigned long l1_table[EFFICEON_L1_SIZE];
+} efficeon_private;
+
+static const struct gatt_mask efficeon_generic_masks[] =
+{
+ {.mask = 0x00000001, .type = 0}
+};
+
+/* This function does the same thing as mask_memory() for this chipset... */
+static inline unsigned long efficeon_mask_memory(struct page *page)
+{
+ unsigned long addr = page_to_phys(page);
+ return addr | 0x00000001;
+}
+
+static const struct aper_size_info_lvl2 efficeon_generic_sizes[4] =
+{
+ {256, 65536, 0},
+ {128, 32768, 32},
+ {64, 16384, 48},
+ {32, 8192, 56}
+};
+
+/*
+ * Control interfaces are largely identical to
+ * the legacy Intel 440BX..
+ */
+
+static int efficeon_fetch_size(void)
+{
+ int i;
+ u16 temp;
+ struct aper_size_info_lvl2 *values;
+
+ pci_read_config_word(agp_bridge->dev, INTEL_APSIZE, &temp);
+ 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 efficeon_tlbflush(struct agp_memory * mem)
+{
+ printk(KERN_DEBUG PFX "efficeon_tlbflush()\n");
+ pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2200);
+ pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2280);
+}
+
+static void efficeon_cleanup(void)
+{
+ u16 temp;
+ struct aper_size_info_lvl2 *previous_size;
+
+ printk(KERN_DEBUG PFX "efficeon_cleanup()\n");
+ previous_size = A_SIZE_LVL2(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 int efficeon_configure(void)
+{
+ u16 temp2;
+ struct aper_size_info_lvl2 *current_size;
+
+ printk(KERN_DEBUG PFX "efficeon_configure()\n");
+
+ current_size = A_SIZE_LVL2(agp_bridge->current_size);
+
+ /* aperture size */
+ pci_write_config_word(agp_bridge->dev, INTEL_APSIZE,
+ current_size->size_value);
+
+ /* address to map to */
+ agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
+ AGP_APERTURE_BAR);
+
+ /* 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) | (1 << 11));
+ /* clear any possible error conditions */
+ pci_write_config_byte(agp_bridge->dev, INTEL_ERRSTS + 1, 7);
+ return 0;
+}
+
+static int efficeon_free_gatt_table(struct agp_bridge_data *bridge)
+{
+ int index, freed = 0;
+
+ for (index = 0; index < EFFICEON_L1_SIZE; index++) {
+ unsigned long page = efficeon_private.l1_table[index];
+ if (page) {
+ efficeon_private.l1_table[index] = 0;
+ ClearPageReserved(virt_to_page((char *)page));
+ free_page(page);
+ freed++;
+ }
+ printk(KERN_DEBUG PFX "efficeon_free_gatt_table(%p, %02x, %08x)\n",
+ agp_bridge->dev, EFFICEON_ATTPAGE, index);
+ pci_write_config_dword(agp_bridge->dev,
+ EFFICEON_ATTPAGE, index);
+ }
+ printk(KERN_DEBUG PFX "efficeon_free_gatt_table() freed %d pages\n", freed);
+ return 0;
+}
+
+
+/*
+ * 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) (efficeon_private.gatt_pages[\
+ GET_PAGE_DIR_IDX(addr)]->remapped)
+
+static int efficeon_create_gatt_table(struct agp_bridge_data *bridge)
+{
+ int index;
+ const int pati = EFFICEON_PATI;
+ const int present = EFFICEON_PRESENT;
+ const int clflush_chunk = ((cpuid_ebx(1) >> 8) & 0xff) << 3;
+ int num_entries, l1_pages;
+
+ num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
+
+ printk(KERN_DEBUG PFX "efficeon_create_gatt_table(%d)\n", num_entries);
+
+ /* There are 2^10 PTE pages per PDE page */
+ BUG_ON(num_entries & 0x3ff);
+ l1_pages = num_entries >> 10;
+
+ for (index = 0 ; index < l1_pages ; index++) {
+ int offset;
+ unsigned long page;
+ unsigned long value;
+
+ page = efficeon_private.l1_table[index];
+ BUG_ON(page);
+
+ page = get_zeroed_page(GFP_KERNEL);
+ if (!page) {
+ efficeon_free_gatt_table(agp_bridge);
+ return -ENOMEM;
+ }
+ SetPageReserved(virt_to_page((char *)page));
+
+ for (offset = 0; offset < PAGE_SIZE; offset += clflush_chunk)
+ clflush((char *)page+offset);
+
+ efficeon_private.l1_table[index] = page;
+
+ value = virt_to_phys((unsigned long *)page) | pati | present | index;
+
+ pci_write_config_dword(agp_bridge->dev,
+ EFFICEON_ATTPAGE, value);
+ }
+
+ return 0;
+}
+
+static int efficeon_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
+{
+ int i, count = mem->page_count, num_entries;
+ unsigned int *page, *last_page;
+ const int clflush_chunk = ((cpuid_ebx(1) >> 8) & 0xff) << 3;
+ const unsigned long clflush_mask = ~(clflush_chunk-1);
+
+ printk(KERN_DEBUG PFX "efficeon_insert_memory(%lx, %d)\n", pg_start, count);
+
+ num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
+ if ((pg_start + mem->page_count) > num_entries)
+ return -EINVAL;
+ if (type != 0 || mem->type != 0)
+ return -EINVAL;
+
+ if (!mem->is_flushed) {
+ global_cache_flush();
+ mem->is_flushed = true;
+ }
+
+ last_page = NULL;
+ for (i = 0; i < count; i++) {
+ int index = pg_start + i;
+ unsigned long insert = efficeon_mask_memory(mem->pages[i]);
+
+ page = (unsigned int *) efficeon_private.l1_table[index >> 10];
+
+ if (!page)
+ continue;
+
+ page += (index & 0x3ff);
+ *page = insert;
+
+ /* clflush is slow, so don't clflush until we have to */
+ if (last_page &&
+ (((unsigned long)page^(unsigned long)last_page) &
+ clflush_mask))
+ clflush(last_page);
+
+ last_page = page;
+ }
+
+ if ( last_page )
+ clflush(last_page);
+
+ agp_bridge->driver->tlb_flush(mem);
+ return 0;
+}
+
+static int efficeon_remove_memory(struct agp_memory * mem, off_t pg_start, int type)
+{
+ int i, count = mem->page_count, num_entries;
+
+ printk(KERN_DEBUG PFX "efficeon_remove_memory(%lx, %d)\n", pg_start, count);
+
+ num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
+
+ if ((pg_start + mem->page_count) > num_entries)
+ return -EINVAL;
+ if (type != 0 || mem->type != 0)
+ return -EINVAL;
+
+ for (i = 0; i < count; i++) {
+ int index = pg_start + i;
+ unsigned int *page = (unsigned int *) efficeon_private.l1_table[index >> 10];
+
+ if (!page)
+ continue;
+ page += (index & 0x3ff);
+ *page = 0;
+ }
+ agp_bridge->driver->tlb_flush(mem);
+ return 0;
+}
+
+
+static const struct agp_bridge_driver efficeon_driver = {
+ .owner = THIS_MODULE,
+ .aperture_sizes = efficeon_generic_sizes,
+ .size_type = LVL2_APER_SIZE,
+ .num_aperture_sizes = 4,
+ .configure = efficeon_configure,
+ .fetch_size = efficeon_fetch_size,
+ .cleanup = efficeon_cleanup,
+ .tlb_flush = efficeon_tlbflush,
+ .mask_memory = agp_generic_mask_memory,
+ .masks = efficeon_generic_masks,
+ .agp_enable = agp_generic_enable,
+ .cache_flush = global_cache_flush,
+
+ // Efficeon-specific GATT table setup / populate / teardown
+ .create_gatt_table = efficeon_create_gatt_table,
+ .free_gatt_table = efficeon_free_gatt_table,
+ .insert_memory = efficeon_insert_memory,
+ .remove_memory = efficeon_remove_memory,
+ .cant_use_aperture = false, // true might be faster?
+
+ // Generic
+ .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 int agp_efficeon_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ struct agp_bridge_data *bridge;
+ u8 cap_ptr;
+ struct resource *r;
+
+ cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
+ if (!cap_ptr)
+ return -ENODEV;
+
+ /* Probe for Efficeon controller */
+ if (pdev->device != PCI_DEVICE_ID_EFFICEON) {
+ printk(KERN_ERR PFX "Unsupported Efficeon chipset (device id: %04x)\n",
+ pdev->device);
+ return -ENODEV;
+ }
+
+ printk(KERN_INFO PFX "Detected Transmeta Efficeon TM8000 series chipset\n");
+
+ bridge = agp_alloc_bridge();
+ if (!bridge)
+ return -ENOMEM;
+
+ bridge->driver = &efficeon_driver;
+ bridge->dev = pdev;
+ bridge->capndx = cap_ptr;
+
+ /*
+ * 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)) {
+ printk(KERN_ERR PFX "Unable to Enable PCI device\n");
+ agp_put_bridge(bridge);
+ return -ENODEV;
+ }
+
+ /*
+ * 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)) {
+ printk(KERN_ERR PFX "could not assign resource 0\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 agp_efficeon_remove(struct pci_dev *pdev)
+{
+ struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
+
+ agp_remove_bridge(bridge);
+ agp_put_bridge(bridge);
+}
+
+#ifdef CONFIG_PM
+static int agp_efficeon_suspend(struct pci_dev *dev, pm_message_t state)
+{
+ return 0;
+}
+
+static int agp_efficeon_resume(struct pci_dev *pdev)
+{
+ printk(KERN_DEBUG PFX "agp_efficeon_resume()\n");
+ return efficeon_configure();
+}
+#endif
+
+static struct pci_device_id agp_efficeon_pci_table[] = {
+ {
+ .class = (PCI_CLASS_BRIDGE_HOST << 8),
+ .class_mask = ~0,
+ .vendor = PCI_VENDOR_ID_TRANSMETA,
+ .device = PCI_ANY_ID,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ },
+ { }
+};
+
+MODULE_DEVICE_TABLE(pci, agp_efficeon_pci_table);
+
+static struct pci_driver agp_efficeon_pci_driver = {
+ .name = "agpgart-efficeon",
+ .id_table = agp_efficeon_pci_table,
+ .probe = agp_efficeon_probe,
+ .remove = agp_efficeon_remove,
+#ifdef CONFIG_PM
+ .suspend = agp_efficeon_suspend,
+ .resume = agp_efficeon_resume,
+#endif
+};
+
+static int __init agp_efficeon_init(void)
+{
+ static int agp_initialised=0;
+
+ if (agp_off)
+ return -EINVAL;
+
+ if (agp_initialised == 1)
+ return 0;
+ agp_initialised=1;
+
+ return pci_register_driver(&agp_efficeon_pci_driver);
+}
+
+static void __exit agp_efficeon_cleanup(void)
+{
+ pci_unregister_driver(&agp_efficeon_pci_driver);
+}
+
+module_init(agp_efficeon_init);
+module_exit(agp_efficeon_cleanup);
+
+MODULE_AUTHOR("Carlos Puchol <cpglinux@puchol.com>");
+MODULE_LICENSE("GPL and additional rights");
Code Review / kvmfornfv.git / blobdiff