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) 27 return NULL; /* 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 if (type) 35 *type = VM_FAULT_MINOR; 36 return page; 37 } 38 39 static struct aper_size_info_fixed alpha_core_agp_sizes[] = 40 { 41 { 0, 0, 0 }, /* filled in by alpha_core_agp_setup */ 42 }; 43 44 struct vm_operations_struct alpha_core_agp_vm_ops = { 45 .nopage = alpha_core_agp_vm_nopage, 46 }; 47 48 49 static int alpha_core_agp_fetch_size(void) 50 { 51 return alpha_core_agp_sizes[0].size; 52 } 53 54 static int alpha_core_agp_configure(void) 55 { 56 alpha_agp_info *agp = agp_bridge->dev_private_data; 57 agp_bridge->gart_bus_addr = agp->aperture.bus_base; 58 return 0; 59 } 60 61 static void alpha_core_agp_cleanup(void) 62 { 63 alpha_agp_info *agp = agp_bridge->dev_private_data; 64 65 agp->ops->cleanup(agp); 66 } 67 68 static void alpha_core_agp_tlbflush(struct agp_memory *mem) 69 { 70 alpha_agp_info *agp = agp_bridge->dev_private_data; 71 alpha_mv.mv_pci_tbi(agp->hose, 0, -1); 72 } 73 74 static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode) 75 { 76 alpha_agp_info *agp = bridge->dev_private_data; 77 78 agp->mode.lw = agp_collect_device_status(bridge, mode, 79 agp->capability.lw); 80 81 agp->mode.bits.enable = 1; 82 agp->ops->configure(agp); 83 84 agp_device_command(agp->mode.lw, 0); 85 } 86 87 static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start, 88 int type) 89 { 90 alpha_agp_info *agp = agp_bridge->dev_private_data; 91 int num_entries, status; 92 void *temp; 93 94 if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES) 95 return -EINVAL; 96 97 temp = agp_bridge->current_size; 98 num_entries = A_SIZE_FIX(temp)->num_entries; 99 if ((pg_start + mem->page_count) > num_entries) 100 return -EINVAL; 101 102 status = agp->ops->bind(agp, pg_start, mem); 103 mb(); 104 alpha_core_agp_tlbflush(mem); 105 106 return status; 107 } 108 109 static int alpha_core_agp_remove_memory(struct agp_memory *mem, off_t pg_start, 110 int type) 111 { 112 alpha_agp_info *agp = agp_bridge->dev_private_data; 113 int status; 114 115 status = agp->ops->unbind(agp, pg_start, mem); 116 alpha_core_agp_tlbflush(mem); 117 return status; 118 } 119 120 static int alpha_core_agp_create_free_gatt_table(struct agp_bridge_data *a) 121 { 122 return 0; 123 } 124 125 struct agp_bridge_driver alpha_core_agp_driver = { 126 .owner = THIS_MODULE, 127 .aperture_sizes = alpha_core_agp_sizes, 128 .num_aperture_sizes = 1, 129 .size_type = FIXED_APER_SIZE, 130 .cant_use_aperture = 1, 131 .masks = NULL, 132 133 .fetch_size = alpha_core_agp_fetch_size, 134 .configure = alpha_core_agp_configure, 135 .agp_enable = alpha_core_agp_enable, 136 .cleanup = alpha_core_agp_cleanup, 137 .tlb_flush = alpha_core_agp_tlbflush, 138 .mask_memory = agp_generic_mask_memory, 139 .cache_flush = global_cache_flush, 140 .create_gatt_table = alpha_core_agp_create_free_gatt_table, 141 .free_gatt_table = alpha_core_agp_create_free_gatt_table, 142 .insert_memory = alpha_core_agp_insert_memory, 143 .remove_memory = alpha_core_agp_remove_memory, 144 .alloc_by_type = agp_generic_alloc_by_type, 145 .free_by_type = agp_generic_free_by_type, 146 .agp_alloc_page = agp_generic_alloc_page, 147 .agp_destroy_page = agp_generic_destroy_page, 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 = alloc_pci_dev(); 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