diff options
Diffstat (limited to 'drivers/char/agp/alpha-agp.c')
| -rw-r--r-- | drivers/char/agp/alpha-agp.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/drivers/char/agp/alpha-agp.c b/drivers/char/agp/alpha-agp.c new file mode 100644 index 000000000000..a072d32005a4 --- /dev/null +++ b/drivers/char/agp/alpha-agp.c @@ -0,0 +1,216 @@ +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/init.h> +#include <linux/agp_backend.h> +#include <linux/mm.h> +#include <linux/slab.h> + +#include <asm/machvec.h> +#include <asm/agp_backend.h> +#include "../../../arch/alpha/kernel/pci_impl.h" + +#include "agp.h" + +static struct page *alpha_core_agp_vm_nopage(struct vm_area_struct *vma, + unsigned long address, + int *type) +{ + alpha_agp_info *agp = agp_bridge->dev_private_data; + dma_addr_t dma_addr; + unsigned long pa; + struct page *page; + + dma_addr = address - vma->vm_start + agp->aperture.bus_base; + pa = agp->ops->translate(agp, dma_addr); + + if (pa == (unsigned long)-EINVAL) return NULL; /* no translation */ + + /* + * Get the page, inc the use count, and return it + */ + page = virt_to_page(__va(pa)); + get_page(page); + if (type) + *type = VM_FAULT_MINOR; + return page; +} + +static struct aper_size_info_fixed alpha_core_agp_sizes[] = +{ + { 0, 0, 0 }, /* filled in by alpha_core_agp_setup */ +}; + +struct vm_operations_struct alpha_core_agp_vm_ops = { + .nopage = alpha_core_agp_vm_nopage, +}; + + +static int alpha_core_agp_nop(void) +{ + /* just return success */ + return 0; +} + +static int alpha_core_agp_fetch_size(void) +{ + return alpha_core_agp_sizes[0].size; +} + +static int alpha_core_agp_configure(void) +{ + alpha_agp_info *agp = agp_bridge->dev_private_data; + agp_bridge->gart_bus_addr = agp->aperture.bus_base; + return 0; +} + +static void alpha_core_agp_cleanup(void) +{ + alpha_agp_info *agp = agp_bridge->dev_private_data; + + agp->ops->cleanup(agp); +} + +static void alpha_core_agp_tlbflush(struct agp_memory *mem) +{ + alpha_agp_info *agp = agp_bridge->dev_private_data; + alpha_mv.mv_pci_tbi(agp->hose, 0, -1); +} + +static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode) +{ + alpha_agp_info *agp = bridge->dev_private_data; + + agp->mode.lw = agp_collect_device_status(bridge, mode, + agp->capability.lw); + + agp->mode.bits.enable = 1; + agp->ops->configure(agp); + + agp_device_command(agp->mode.lw, 0); +} + +static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start, + int type) +{ + alpha_agp_info *agp = agp_bridge->dev_private_data; + int num_entries, status; + void *temp; + + temp = agp_bridge->current_size; + num_entries = A_SIZE_FIX(temp)->num_entries; + if ((pg_start + mem->page_count) > num_entries) return -EINVAL; + + status = agp->ops->bind(agp, pg_start, mem); + mb(); + alpha_core_agp_tlbflush(mem); + + return status; +} + +static int alpha_core_agp_remove_memory(struct agp_memory *mem, off_t pg_start, + int type) +{ + alpha_agp_info *agp = agp_bridge->dev_private_data; + int status; + + status = agp->ops->unbind(agp, pg_start, mem); + alpha_core_agp_tlbflush(mem); + return status; +} + +struct agp_bridge_driver alpha_core_agp_driver = { + .owner = THIS_MODULE, + .aperture_sizes = alpha_core_agp_sizes, + .num_aperture_sizes = 1, + .size_type = FIXED_APER_SIZE, + .cant_use_aperture = 1, + .masks = NULL, + + .fetch_size = alpha_core_agp_fetch_size, + .configure = alpha_core_agp_configure, + .agp_enable = alpha_core_agp_enable, + .cleanup = alpha_core_agp_cleanup, + .tlb_flush = alpha_core_agp_tlbflush, + .mask_memory = agp_generic_mask_memory, + .cache_flush = global_cache_flush, + .create_gatt_table = alpha_core_agp_nop, + .free_gatt_table = alpha_core_agp_nop, + .insert_memory = alpha_core_agp_insert_memory, + .remove_memory = alpha_core_agp_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, +}; + +struct agp_bridge_data *alpha_bridge; + +int __init +alpha_core_agp_setup(void) +{ + alpha_agp_info *agp = alpha_mv.agp_info(); + struct pci_dev *pdev; /* faked */ + struct aper_size_info_fixed *aper_size; + + if (!agp) + return -ENODEV; + if (agp->ops->setup(agp)) + return -ENODEV; + + /* + * Build the aperture size descriptor + */ + aper_size = alpha_core_agp_sizes; + aper_size->size = agp->aperture.size / (1024 * 1024); + aper_size->num_entries = agp->aperture.size / PAGE_SIZE; + aper_size->page_order = __ffs(aper_size->num_entries / 1024); + + /* + * Build a fake pci_dev struct + */ + pdev = kmalloc(sizeof(struct pci_dev), GFP_KERNEL); + if (!pdev) + return -ENOMEM; + pdev->vendor = 0xffff; + pdev->device = 0xffff; + pdev->sysdata = agp->hose; + + alpha_bridge = agp_alloc_bridge(); + if (!alpha_bridge) + goto fail; + + alpha_bridge->driver = &alpha_core_agp_driver; + alpha_bridge->vm_ops = &alpha_core_agp_vm_ops; + alpha_bridge->current_size = aper_size; /* only 1 size */ + alpha_bridge->dev_private_data = agp; + alpha_bridge->dev = pdev; + alpha_bridge->mode = agp->capability.lw; + + printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index); + return agp_add_bridge(alpha_bridge); + + fail: + kfree(pdev); + return -ENOMEM; +} + +static int __init agp_alpha_core_init(void) +{ + if (agp_off) + return -EINVAL; + if (alpha_mv.agp_info) + return alpha_core_agp_setup(); + return -ENODEV; +} + +static void __exit agp_alpha_core_cleanup(void) +{ + agp_remove_bridge(alpha_bridge); + agp_put_bridge(alpha_bridge); +} + +module_init(agp_alpha_core_init); +module_exit(agp_alpha_core_cleanup); + +MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>"); +MODULE_LICENSE("GPL and additional rights"); |