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_area_struct *vma, 15 struct vm_fault *vmf) 16 { 17 alpha_agp_info *agp = agp_bridge->dev_private_data; 18 dma_addr_t dma_addr; 19 unsigned long pa; 20 struct page *page; 21 22 dma_addr = (unsigned long)vmf->virtual_address - vma->vm_start 23 + agp->aperture.bus_base; 24 pa = agp->ops->translate(agp, dma_addr); 25 26 if (pa == (unsigned long)-EINVAL) 27 return VM_FAULT_SIGBUS; /* no translation */ 28 29 /* 30 * Get the page, inc the use count, and return it 31 */ 32 page = virt_to_page(__va(pa)); 33 get_page(page); 34 vmf->page = page; 35 return 0; 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 static const struct vm_operations_struct alpha_core_agp_vm_ops = { 44 .fault = alpha_core_agp_vm_fault, 45 }; 46 47 48 static int alpha_core_agp_fetch_size(void) 49 { 50 return alpha_core_agp_sizes[0].size; 51 } 52 53 static int alpha_core_agp_configure(void) 54 { 55 alpha_agp_info *agp = agp_bridge->dev_private_data; 56 agp_bridge->gart_bus_addr = agp->aperture.bus_base; 57 return 0; 58 } 59 60 static void alpha_core_agp_cleanup(void) 61 { 62 alpha_agp_info *agp = agp_bridge->dev_private_data; 63 64 agp->ops->cleanup(agp); 65 } 66 67 static void alpha_core_agp_tlbflush(struct agp_memory *mem) 68 { 69 alpha_agp_info *agp = agp_bridge->dev_private_data; 70 alpha_mv.mv_pci_tbi(agp->hose, 0, -1); 71 } 72 73 static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode) 74 { 75 alpha_agp_info *agp = bridge->dev_private_data; 76 77 agp->mode.lw = agp_collect_device_status(bridge, mode, 78 agp->capability.lw); 79 80 agp->mode.bits.enable = 1; 81 agp->ops->configure(agp); 82 83 agp_device_command(agp->mode.lw, false); 84 } 85 86 static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start, 87 int type) 88 { 89 alpha_agp_info *agp = agp_bridge->dev_private_data; 90 int num_entries, status; 91 void *temp; 92 93 if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES) 94 return -EINVAL; 95 96 temp = agp_bridge->current_size; 97 num_entries = A_SIZE_FIX(temp)->num_entries; 98 if ((pg_start + mem->page_count) > num_entries) 99 return -EINVAL; 100 101 status = agp->ops->bind(agp, pg_start, mem); 102 mb(); 103 alpha_core_agp_tlbflush(mem); 104 105 return status; 106 } 107 108 static int alpha_core_agp_remove_memory(struct agp_memory *mem, off_t pg_start, 109 int type) 110 { 111 alpha_agp_info *agp = agp_bridge->dev_private_data; 112 int status; 113 114 status = agp->ops->unbind(agp, pg_start, mem); 115 alpha_core_agp_tlbflush(mem); 116 return status; 117 } 118 119 static int alpha_core_agp_create_free_gatt_table(struct agp_bridge_data *a) 120 { 121 return 0; 122 } 123 124 struct agp_bridge_driver alpha_core_agp_driver = { 125 .owner = THIS_MODULE, 126 .aperture_sizes = alpha_core_agp_sizes, 127 .num_aperture_sizes = 1, 128 .size_type = FIXED_APER_SIZE, 129 .cant_use_aperture = true, 130 .masks = NULL, 131 132 .fetch_size = alpha_core_agp_fetch_size, 133 .configure = alpha_core_agp_configure, 134 .agp_enable = alpha_core_agp_enable, 135 .cleanup = alpha_core_agp_cleanup, 136 .tlb_flush = alpha_core_agp_tlbflush, 137 .mask_memory = agp_generic_mask_memory, 138 .cache_flush = global_cache_flush, 139 .create_gatt_table = alpha_core_agp_create_free_gatt_table, 140 .free_gatt_table = alpha_core_agp_create_free_gatt_table, 141 .insert_memory = alpha_core_agp_insert_memory, 142 .remove_memory = alpha_core_agp_remove_memory, 143 .alloc_by_type = agp_generic_alloc_by_type, 144 .free_by_type = agp_generic_free_by_type, 145 .agp_alloc_page = agp_generic_alloc_page, 146 .agp_alloc_pages = agp_generic_alloc_pages, 147 .agp_destroy_page = agp_generic_destroy_page, 148 .agp_destroy_pages = agp_generic_destroy_pages, 149 .agp_type_to_mask_type = agp_generic_type_to_mask_type, 150 }; 151 152 struct agp_bridge_data *alpha_bridge; 153 154 int __init 155 alpha_core_agp_setup(void) 156 { 157 alpha_agp_info *agp = alpha_mv.agp_info(); 158 struct pci_dev *pdev; /* faked */ 159 struct aper_size_info_fixed *aper_size; 160 161 if (!agp) 162 return -ENODEV; 163 if (agp->ops->setup(agp)) 164 return -ENODEV; 165 166 /* 167 * Build the aperture size descriptor 168 */ 169 aper_size = alpha_core_agp_sizes; 170 aper_size->size = agp->aperture.size / (1024 * 1024); 171 aper_size->num_entries = agp->aperture.size / PAGE_SIZE; 172 aper_size->page_order = __ffs(aper_size->num_entries / 1024); 173 174 /* 175 * Build a fake pci_dev struct 176 */ 177 pdev = pci_alloc_dev(NULL); 178 if (!pdev) 179 return -ENOMEM; 180 pdev->vendor = 0xffff; 181 pdev->device = 0xffff; 182 pdev->sysdata = agp->hose; 183 184 alpha_bridge = agp_alloc_bridge(); 185 if (!alpha_bridge) 186 goto fail; 187 188 alpha_bridge->driver = &alpha_core_agp_driver; 189 alpha_bridge->vm_ops = &alpha_core_agp_vm_ops; 190 alpha_bridge->current_size = aper_size; /* only 1 size */ 191 alpha_bridge->dev_private_data = agp; 192 alpha_bridge->dev = pdev; 193 alpha_bridge->mode = agp->capability.lw; 194 195 printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index); 196 return agp_add_bridge(alpha_bridge); 197 198 fail: 199 kfree(pdev); 200 return -ENOMEM; 201 } 202 203 static int __init agp_alpha_core_init(void) 204 { 205 if (agp_off) 206 return -EINVAL; 207 if (alpha_mv.agp_info) 208 return alpha_core_agp_setup(); 209 return -ENODEV; 210 } 211 212 static void __exit agp_alpha_core_cleanup(void) 213 { 214 agp_remove_bridge(alpha_bridge); 215 agp_put_bridge(alpha_bridge); 216 } 217 218 module_init(agp_alpha_core_init); 219 module_exit(agp_alpha_core_cleanup); 220 221 MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>"); 222 MODULE_LICENSE("GPL and additional rights"); 223