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 int alpha_core_agp_vm_fault(struct vm_fault *vmf) 15 { 16 alpha_agp_info *agp = agp_bridge->dev_private_data; 17 dma_addr_t dma_addr; 18 unsigned long pa; 19 struct page *page; 20 21 dma_addr = vmf->address - vmf->vma->vm_start + agp->aperture.bus_base; 22 pa = agp->ops->translate(agp, dma_addr); 23 24 if (pa == (unsigned long)-EINVAL) 25 return VM_FAULT_SIGBUS; /* no translation */ 26 27 /* 28 * Get the page, inc the use count, and return it 29 */ 30 page = virt_to_page(__va(pa)); 31 get_page(page); 32 vmf->page = page; 33 return 0; 34 } 35 36 static struct aper_size_info_fixed alpha_core_agp_sizes[] = 37 { 38 { 0, 0, 0 }, /* filled in by alpha_core_agp_setup */ 39 }; 40 41 static const struct vm_operations_struct alpha_core_agp_vm_ops = { 42 .fault = alpha_core_agp_vm_fault, 43 }; 44 45 46 static int alpha_core_agp_fetch_size(void) 47 { 48 return alpha_core_agp_sizes[0].size; 49 } 50 51 static int alpha_core_agp_configure(void) 52 { 53 alpha_agp_info *agp = agp_bridge->dev_private_data; 54 agp_bridge->gart_bus_addr = agp->aperture.bus_base; 55 return 0; 56 } 57 58 static void alpha_core_agp_cleanup(void) 59 { 60 alpha_agp_info *agp = agp_bridge->dev_private_data; 61 62 agp->ops->cleanup(agp); 63 } 64 65 static void alpha_core_agp_tlbflush(struct agp_memory *mem) 66 { 67 alpha_agp_info *agp = agp_bridge->dev_private_data; 68 alpha_mv.mv_pci_tbi(agp->hose, 0, -1); 69 } 70 71 static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode) 72 { 73 alpha_agp_info *agp = bridge->dev_private_data; 74 75 agp->mode.lw = agp_collect_device_status(bridge, mode, 76 agp->capability.lw); 77 78 agp->mode.bits.enable = 1; 79 agp->ops->configure(agp); 80 81 agp_device_command(agp->mode.lw, false); 82 } 83 84 static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start, 85 int type) 86 { 87 alpha_agp_info *agp = agp_bridge->dev_private_data; 88 int num_entries, status; 89 void *temp; 90 91 if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES) 92 return -EINVAL; 93 94 temp = agp_bridge->current_size; 95 num_entries = A_SIZE_FIX(temp)->num_entries; 96 if ((pg_start + mem->page_count) > num_entries) 97 return -EINVAL; 98 99 status = agp->ops->bind(agp, pg_start, mem); 100 mb(); 101 alpha_core_agp_tlbflush(mem); 102 103 return status; 104 } 105 106 static int alpha_core_agp_remove_memory(struct agp_memory *mem, off_t pg_start, 107 int type) 108 { 109 alpha_agp_info *agp = agp_bridge->dev_private_data; 110 int status; 111 112 status = agp->ops->unbind(agp, pg_start, mem); 113 alpha_core_agp_tlbflush(mem); 114 return status; 115 } 116 117 static int alpha_core_agp_create_free_gatt_table(struct agp_bridge_data *a) 118 { 119 return 0; 120 } 121 122 struct agp_bridge_driver alpha_core_agp_driver = { 123 .owner = THIS_MODULE, 124 .aperture_sizes = alpha_core_agp_sizes, 125 .num_aperture_sizes = 1, 126 .size_type = FIXED_APER_SIZE, 127 .cant_use_aperture = true, 128 .masks = NULL, 129 130 .fetch_size = alpha_core_agp_fetch_size, 131 .configure = alpha_core_agp_configure, 132 .agp_enable = alpha_core_agp_enable, 133 .cleanup = alpha_core_agp_cleanup, 134 .tlb_flush = alpha_core_agp_tlbflush, 135 .mask_memory = agp_generic_mask_memory, 136 .cache_flush = global_cache_flush, 137 .create_gatt_table = alpha_core_agp_create_free_gatt_table, 138 .free_gatt_table = alpha_core_agp_create_free_gatt_table, 139 .insert_memory = alpha_core_agp_insert_memory, 140 .remove_memory = alpha_core_agp_remove_memory, 141 .alloc_by_type = agp_generic_alloc_by_type, 142 .free_by_type = agp_generic_free_by_type, 143 .agp_alloc_page = agp_generic_alloc_page, 144 .agp_alloc_pages = agp_generic_alloc_pages, 145 .agp_destroy_page = agp_generic_destroy_page, 146 .agp_destroy_pages = agp_generic_destroy_pages, 147 .agp_type_to_mask_type = agp_generic_type_to_mask_type, 148 }; 149 150 struct agp_bridge_data *alpha_bridge; 151 152 int __init 153 alpha_core_agp_setup(void) 154 { 155 alpha_agp_info *agp = alpha_mv.agp_info(); 156 struct pci_dev *pdev; /* faked */ 157 struct aper_size_info_fixed *aper_size; 158 159 if (!agp) 160 return -ENODEV; 161 if (agp->ops->setup(agp)) 162 return -ENODEV; 163 164 /* 165 * Build the aperture size descriptor 166 */ 167 aper_size = alpha_core_agp_sizes; 168 aper_size->size = agp->aperture.size / (1024 * 1024); 169 aper_size->num_entries = agp->aperture.size / PAGE_SIZE; 170 aper_size->page_order = __ffs(aper_size->num_entries / 1024); 171 172 /* 173 * Build a fake pci_dev struct 174 */ 175 pdev = pci_alloc_dev(NULL); 176 if (!pdev) 177 return -ENOMEM; 178 pdev->vendor = 0xffff; 179 pdev->device = 0xffff; 180 pdev->sysdata = agp->hose; 181 182 alpha_bridge = agp_alloc_bridge(); 183 if (!alpha_bridge) 184 goto fail; 185 186 alpha_bridge->driver = &alpha_core_agp_driver; 187 alpha_bridge->vm_ops = &alpha_core_agp_vm_ops; 188 alpha_bridge->current_size = aper_size; /* only 1 size */ 189 alpha_bridge->dev_private_data = agp; 190 alpha_bridge->dev = pdev; 191 alpha_bridge->mode = agp->capability.lw; 192 193 printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index); 194 return agp_add_bridge(alpha_bridge); 195 196 fail: 197 kfree(pdev); 198 return -ENOMEM; 199 } 200 201 static int __init agp_alpha_core_init(void) 202 { 203 if (agp_off) 204 return -EINVAL; 205 if (alpha_mv.agp_info) 206 return alpha_core_agp_setup(); 207 return -ENODEV; 208 } 209 210 static void __exit agp_alpha_core_cleanup(void) 211 { 212 agp_remove_bridge(alpha_bridge); 213 agp_put_bridge(alpha_bridge); 214 } 215 216 module_init(agp_alpha_core_init); 217 module_exit(agp_alpha_core_cleanup); 218 219 MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>"); 220 MODULE_LICENSE("GPL and additional rights"); 221