1 #include <linux/module.h> 2 #include <linux/pci.h> 3 #include <linux/init.h> 4 #include <linux/agp_backend.h> 5 #include <linux/mm.h> 6 #include <linux/slab.h> 7 8 #include <asm/machvec.h> 9 #include <asm/agp_backend.h> 10 #include "../../../arch/alpha/kernel/pci_impl.h" 11 12 #include "agp.h" 13 14 static struct page *alpha_core_agp_vm_nopage(struct vm_area_struct *vma, 15 unsigned long address, 16 int *type) 17 { 18 alpha_agp_info *agp = agp_bridge->dev_private_data; 19 dma_addr_t dma_addr; 20 unsigned long pa; 21 struct page *page; 22 23 dma_addr = address - vma->vm_start + agp->aperture.bus_base; 24 pa = agp->ops->translate(agp, dma_addr); 25 26 if (pa == (unsigned long)-EINVAL) return NULL; /* no translation */ 27 28 /* 29 * Get the page, inc the use count, and return it 30 */ 31 page = virt_to_page(__va(pa)); 32 get_page(page); 33 if (type) 34 *type = VM_FAULT_MINOR; 35 return page; 36 } 37 38 static struct aper_size_info_fixed alpha_core_agp_sizes[] = 39 { 40 { 0, 0, 0 }, /* filled in by alpha_core_agp_setup */ 41 }; 42 43 struct vm_operations_struct alpha_core_agp_vm_ops = { 44 .nopage = alpha_core_agp_vm_nopage, 45 }; 46 47 48 static int alpha_core_agp_nop(void) 49 { 50 /* just return success */ 51 return 0; 52 } 53 54 static int alpha_core_agp_fetch_size(void) 55 { 56 return alpha_core_agp_sizes[0].size; 57 } 58 59 static int alpha_core_agp_configure(void) 60 { 61 alpha_agp_info *agp = agp_bridge->dev_private_data; 62 agp_bridge->gart_bus_addr = agp->aperture.bus_base; 63 return 0; 64 } 65 66 static void alpha_core_agp_cleanup(void) 67 { 68 alpha_agp_info *agp = agp_bridge->dev_private_data; 69 70 agp->ops->cleanup(agp); 71 } 72 73 static void alpha_core_agp_tlbflush(struct agp_memory *mem) 74 { 75 alpha_agp_info *agp = agp_bridge->dev_private_data; 76 alpha_mv.mv_pci_tbi(agp->hose, 0, -1); 77 } 78 79 static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode) 80 { 81 alpha_agp_info *agp = bridge->dev_private_data; 82 83 agp->mode.lw = agp_collect_device_status(bridge, mode, 84 agp->capability.lw); 85 86 agp->mode.bits.enable = 1; 87 agp->ops->configure(agp); 88 89 agp_device_command(agp->mode.lw, 0); 90 } 91 92 static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start, 93 int type) 94 { 95 alpha_agp_info *agp = agp_bridge->dev_private_data; 96 int num_entries, status; 97 void *temp; 98 99 temp = agp_bridge->current_size; 100 num_entries = A_SIZE_FIX(temp)->num_entries; 101 if ((pg_start + mem->page_count) > num_entries) return -EINVAL; 102 103 status = agp->ops->bind(agp, pg_start, mem); 104 mb(); 105 alpha_core_agp_tlbflush(mem); 106 107 return status; 108 } 109 110 static int alpha_core_agp_remove_memory(struct agp_memory *mem, off_t pg_start, 111 int type) 112 { 113 alpha_agp_info *agp = agp_bridge->dev_private_data; 114 int status; 115 116 status = agp->ops->unbind(agp, pg_start, mem); 117 alpha_core_agp_tlbflush(mem); 118 return status; 119 } 120 121 struct agp_bridge_driver alpha_core_agp_driver = { 122 .owner = THIS_MODULE, 123 .aperture_sizes = alpha_core_agp_sizes, 124 .num_aperture_sizes = 1, 125 .size_type = FIXED_APER_SIZE, 126 .cant_use_aperture = 1, 127 .masks = NULL, 128 129 .fetch_size = alpha_core_agp_fetch_size, 130 .configure = alpha_core_agp_configure, 131 .agp_enable = alpha_core_agp_enable, 132 .cleanup = alpha_core_agp_cleanup, 133 .tlb_flush = alpha_core_agp_tlbflush, 134 .mask_memory = agp_generic_mask_memory, 135 .cache_flush = global_cache_flush, 136 .create_gatt_table = alpha_core_agp_nop, 137 .free_gatt_table = alpha_core_agp_nop, 138 .insert_memory = alpha_core_agp_insert_memory, 139 .remove_memory = alpha_core_agp_remove_memory, 140 .alloc_by_type = agp_generic_alloc_by_type, 141 .free_by_type = agp_generic_free_by_type, 142 .agp_alloc_page = agp_generic_alloc_page, 143 .agp_destroy_page = agp_generic_destroy_page, 144 }; 145 146 struct agp_bridge_data *alpha_bridge; 147 148 int __init 149 alpha_core_agp_setup(void) 150 { 151 alpha_agp_info *agp = alpha_mv.agp_info(); 152 struct pci_dev *pdev; /* faked */ 153 struct aper_size_info_fixed *aper_size; 154 155 if (!agp) 156 return -ENODEV; 157 if (agp->ops->setup(agp)) 158 return -ENODEV; 159 160 /* 161 * Build the aperture size descriptor 162 */ 163 aper_size = alpha_core_agp_sizes; 164 aper_size->size = agp->aperture.size / (1024 * 1024); 165 aper_size->num_entries = agp->aperture.size / PAGE_SIZE; 166 aper_size->page_order = __ffs(aper_size->num_entries / 1024); 167 168 /* 169 * Build a fake pci_dev struct 170 */ 171 pdev = kmalloc(sizeof(struct pci_dev), GFP_KERNEL); 172 if (!pdev) 173 return -ENOMEM; 174 pdev->vendor = 0xffff; 175 pdev->device = 0xffff; 176 pdev->sysdata = agp->hose; 177 178 alpha_bridge = agp_alloc_bridge(); 179 if (!alpha_bridge) 180 goto fail; 181 182 alpha_bridge->driver = &alpha_core_agp_driver; 183 alpha_bridge->vm_ops = &alpha_core_agp_vm_ops; 184 alpha_bridge->current_size = aper_size; /* only 1 size */ 185 alpha_bridge->dev_private_data = agp; 186 alpha_bridge->dev = pdev; 187 alpha_bridge->mode = agp->capability.lw; 188 189 printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index); 190 return agp_add_bridge(alpha_bridge); 191 192 fail: 193 kfree(pdev); 194 return -ENOMEM; 195 } 196 197 static int __init agp_alpha_core_init(void) 198 { 199 if (agp_off) 200 return -EINVAL; 201 if (alpha_mv.agp_info) 202 return alpha_core_agp_setup(); 203 return -ENODEV; 204 } 205 206 static void __exit agp_alpha_core_cleanup(void) 207 { 208 agp_remove_bridge(alpha_bridge); 209 agp_put_bridge(alpha_bridge); 210 } 211 212 module_init(agp_alpha_core_init); 213 module_exit(agp_alpha_core_cleanup); 214 215 MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>"); 216 MODULE_LICENSE("GPL and additional rights"); 217