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 = vmf->address - vma->vm_start + agp->aperture.bus_base; 23 pa = agp->ops->translate(agp, dma_addr); 24 25 if (pa == (unsigned long)-EINVAL) 26 return VM_FAULT_SIGBUS; /* 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 vmf->page = page; 34 return 0; 35 } 36 37 static struct aper_size_info_fixed alpha_core_agp_sizes[] = 38 { 39 { 0, 0, 0 }, /* filled in by alpha_core_agp_setup */ 40 }; 41 42 static const struct vm_operations_struct alpha_core_agp_vm_ops = { 43 .fault = alpha_core_agp_vm_fault, 44 }; 45 46 47 static int alpha_core_agp_fetch_size(void) 48 { 49 return alpha_core_agp_sizes[0].size; 50 } 51 52 static int alpha_core_agp_configure(void) 53 { 54 alpha_agp_info *agp = agp_bridge->dev_private_data; 55 agp_bridge->gart_bus_addr = agp->aperture.bus_base; 56 return 0; 57 } 58 59 static void alpha_core_agp_cleanup(void) 60 { 61 alpha_agp_info *agp = agp_bridge->dev_private_data; 62 63 agp->ops->cleanup(agp); 64 } 65 66 static void alpha_core_agp_tlbflush(struct agp_memory *mem) 67 { 68 alpha_agp_info *agp = agp_bridge->dev_private_data; 69 alpha_mv.mv_pci_tbi(agp->hose, 0, -1); 70 } 71 72 static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode) 73 { 74 alpha_agp_info *agp = bridge->dev_private_data; 75 76 agp->mode.lw = agp_collect_device_status(bridge, mode, 77 agp->capability.lw); 78 79 agp->mode.bits.enable = 1; 80 agp->ops->configure(agp); 81 82 agp_device_command(agp->mode.lw, false); 83 } 84 85 static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start, 86 int type) 87 { 88 alpha_agp_info *agp = agp_bridge->dev_private_data; 89 int num_entries, status; 90 void *temp; 91 92 if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES) 93 return -EINVAL; 94 95 temp = agp_bridge->current_size; 96 num_entries = A_SIZE_FIX(temp)->num_entries; 97 if ((pg_start + mem->page_count) > num_entries) 98 return -EINVAL; 99 100 status = agp->ops->bind(agp, pg_start, mem); 101 mb(); 102 alpha_core_agp_tlbflush(mem); 103 104 return status; 105 } 106 107 static int alpha_core_agp_remove_memory(struct agp_memory *mem, off_t pg_start, 108 int type) 109 { 110 alpha_agp_info *agp = agp_bridge->dev_private_data; 111 int status; 112 113 status = agp->ops->unbind(agp, pg_start, mem); 114 alpha_core_agp_tlbflush(mem); 115 return status; 116 } 117 118 static int alpha_core_agp_create_free_gatt_table(struct agp_bridge_data *a) 119 { 120 return 0; 121 } 122 123 struct agp_bridge_driver alpha_core_agp_driver = { 124 .owner = THIS_MODULE, 125 .aperture_sizes = alpha_core_agp_sizes, 126 .num_aperture_sizes = 1, 127 .size_type = FIXED_APER_SIZE, 128 .cant_use_aperture = true, 129 .masks = NULL, 130 131 .fetch_size = alpha_core_agp_fetch_size, 132 .configure = alpha_core_agp_configure, 133 .agp_enable = alpha_core_agp_enable, 134 .cleanup = alpha_core_agp_cleanup, 135 .tlb_flush = alpha_core_agp_tlbflush, 136 .mask_memory = agp_generic_mask_memory, 137 .cache_flush = global_cache_flush, 138 .create_gatt_table = alpha_core_agp_create_free_gatt_table, 139 .free_gatt_table = alpha_core_agp_create_free_gatt_table, 140 .insert_memory = alpha_core_agp_insert_memory, 141 .remove_memory = alpha_core_agp_remove_memory, 142 .alloc_by_type = agp_generic_alloc_by_type, 143 .free_by_type = agp_generic_free_by_type, 144 .agp_alloc_page = agp_generic_alloc_page, 145 .agp_alloc_pages = agp_generic_alloc_pages, 146 .agp_destroy_page = agp_generic_destroy_page, 147 .agp_destroy_pages = agp_generic_destroy_pages, 148 .agp_type_to_mask_type = agp_generic_type_to_mask_type, 149 }; 150 151 struct agp_bridge_data *alpha_bridge; 152 153 int __init 154 alpha_core_agp_setup(void) 155 { 156 alpha_agp_info *agp = alpha_mv.agp_info(); 157 struct pci_dev *pdev; /* faked */ 158 struct aper_size_info_fixed *aper_size; 159 160 if (!agp) 161 return -ENODEV; 162 if (agp->ops->setup(agp)) 163 return -ENODEV; 164 165 /* 166 * Build the aperture size descriptor 167 */ 168 aper_size = alpha_core_agp_sizes; 169 aper_size->size = agp->aperture.size / (1024 * 1024); 170 aper_size->num_entries = agp->aperture.size / PAGE_SIZE; 171 aper_size->page_order = __ffs(aper_size->num_entries / 1024); 172 173 /* 174 * Build a fake pci_dev struct 175 */ 176 pdev = pci_alloc_dev(NULL); 177 if (!pdev) 178 return -ENOMEM; 179 pdev->vendor = 0xffff; 180 pdev->device = 0xffff; 181 pdev->sysdata = agp->hose; 182 183 alpha_bridge = agp_alloc_bridge(); 184 if (!alpha_bridge) 185 goto fail; 186 187 alpha_bridge->driver = &alpha_core_agp_driver; 188 alpha_bridge->vm_ops = &alpha_core_agp_vm_ops; 189 alpha_bridge->current_size = aper_size; /* only 1 size */ 190 alpha_bridge->dev_private_data = agp; 191 alpha_bridge->dev = pdev; 192 alpha_bridge->mode = agp->capability.lw; 193 194 printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index); 195 return agp_add_bridge(alpha_bridge); 196 197 fail: 198 kfree(pdev); 199 return -ENOMEM; 200 } 201 202 static int __init agp_alpha_core_init(void) 203 { 204 if (agp_off) 205 return -EINVAL; 206 if (alpha_mv.agp_info) 207 return alpha_core_agp_setup(); 208 return -ENODEV; 209 } 210 211 static void __exit agp_alpha_core_cleanup(void) 212 { 213 agp_remove_bridge(alpha_bridge); 214 agp_put_bridge(alpha_bridge); 215 } 216 217 module_init(agp_alpha_core_init); 218 module_exit(agp_alpha_core_cleanup); 219 220 MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>"); 221 MODULE_LICENSE("GPL and additional rights"); 222