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 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 = 1, 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_destroy_page = agp_generic_destroy_page, 145 }; 146 147 struct agp_bridge_data *alpha_bridge; 148 149 int __init 150 alpha_core_agp_setup(void) 151 { 152 alpha_agp_info *agp = alpha_mv.agp_info(); 153 struct pci_dev *pdev; /* faked */ 154 struct aper_size_info_fixed *aper_size; 155 156 if (!agp) 157 return -ENODEV; 158 if (agp->ops->setup(agp)) 159 return -ENODEV; 160 161 /* 162 * Build the aperture size descriptor 163 */ 164 aper_size = alpha_core_agp_sizes; 165 aper_size->size = agp->aperture.size / (1024 * 1024); 166 aper_size->num_entries = agp->aperture.size / PAGE_SIZE; 167 aper_size->page_order = __ffs(aper_size->num_entries / 1024); 168 169 /* 170 * Build a fake pci_dev struct 171 */ 172 pdev = kmalloc(sizeof(struct pci_dev), GFP_KERNEL); 173 if (!pdev) 174 return -ENOMEM; 175 pdev->vendor = 0xffff; 176 pdev->device = 0xffff; 177 pdev->sysdata = agp->hose; 178 179 alpha_bridge = agp_alloc_bridge(); 180 if (!alpha_bridge) 181 goto fail; 182 183 alpha_bridge->driver = &alpha_core_agp_driver; 184 alpha_bridge->vm_ops = &alpha_core_agp_vm_ops; 185 alpha_bridge->current_size = aper_size; /* only 1 size */ 186 alpha_bridge->dev_private_data = agp; 187 alpha_bridge->dev = pdev; 188 alpha_bridge->mode = agp->capability.lw; 189 190 printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index); 191 return agp_add_bridge(alpha_bridge); 192 193 fail: 194 kfree(pdev); 195 return -ENOMEM; 196 } 197 198 static int __init agp_alpha_core_init(void) 199 { 200 if (agp_off) 201 return -EINVAL; 202 if (alpha_mv.agp_info) 203 return alpha_core_agp_setup(); 204 return -ENODEV; 205 } 206 207 static void __exit agp_alpha_core_cleanup(void) 208 { 209 agp_remove_bridge(alpha_bridge); 210 agp_put_bridge(alpha_bridge); 211 } 212 213 module_init(agp_alpha_core_init); 214 module_exit(agp_alpha_core_cleanup); 215 216 MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>"); 217 MODULE_LICENSE("GPL and additional rights"); 218