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_nop(void) 50 { 51 /* just return success */ 52 return 0; 53 } 54 55 static int alpha_core_agp_fetch_size(void) 56 { 57 return alpha_core_agp_sizes[0].size; 58 } 59 60 static int alpha_core_agp_configure(void) 61 { 62 alpha_agp_info *agp = agp_bridge->dev_private_data; 63 agp_bridge->gart_bus_addr = agp->aperture.bus_base; 64 return 0; 65 } 66 67 static void alpha_core_agp_cleanup(void) 68 { 69 alpha_agp_info *agp = agp_bridge->dev_private_data; 70 71 agp->ops->cleanup(agp); 72 } 73 74 static void alpha_core_agp_tlbflush(struct agp_memory *mem) 75 { 76 alpha_agp_info *agp = agp_bridge->dev_private_data; 77 alpha_mv.mv_pci_tbi(agp->hose, 0, -1); 78 } 79 80 static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode) 81 { 82 alpha_agp_info *agp = bridge->dev_private_data; 83 84 agp->mode.lw = agp_collect_device_status(bridge, mode, 85 agp->capability.lw); 86 87 agp->mode.bits.enable = 1; 88 agp->ops->configure(agp); 89 90 agp_device_command(agp->mode.lw, 0); 91 } 92 93 static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start, 94 int type) 95 { 96 alpha_agp_info *agp = agp_bridge->dev_private_data; 97 int num_entries, status; 98 void *temp; 99 100 temp = agp_bridge->current_size; 101 num_entries = A_SIZE_FIX(temp)->num_entries; 102 if ((pg_start + mem->page_count) > num_entries) 103 return -EINVAL; 104 105 status = agp->ops->bind(agp, pg_start, mem); 106 mb(); 107 alpha_core_agp_tlbflush(mem); 108 109 return status; 110 } 111 112 static int alpha_core_agp_remove_memory(struct agp_memory *mem, off_t pg_start, 113 int type) 114 { 115 alpha_agp_info *agp = agp_bridge->dev_private_data; 116 int status; 117 118 status = agp->ops->unbind(agp, pg_start, mem); 119 alpha_core_agp_tlbflush(mem); 120 return status; 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 = 1, 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_nop, 139 .free_gatt_table = alpha_core_agp_nop, 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_destroy_page = agp_generic_destroy_page, 146 }; 147 148 struct agp_bridge_data *alpha_bridge; 149 150 int __init 151 alpha_core_agp_setup(void) 152 { 153 alpha_agp_info *agp = alpha_mv.agp_info(); 154 struct pci_dev *pdev; /* faked */ 155 struct aper_size_info_fixed *aper_size; 156 157 if (!agp) 158 return -ENODEV; 159 if (agp->ops->setup(agp)) 160 return -ENODEV; 161 162 /* 163 * Build the aperture size descriptor 164 */ 165 aper_size = alpha_core_agp_sizes; 166 aper_size->size = agp->aperture.size / (1024 * 1024); 167 aper_size->num_entries = agp->aperture.size / PAGE_SIZE; 168 aper_size->page_order = __ffs(aper_size->num_entries / 1024); 169 170 /* 171 * Build a fake pci_dev struct 172 */ 173 pdev = kmalloc(sizeof(struct pci_dev), GFP_KERNEL); 174 if (!pdev) 175 return -ENOMEM; 176 pdev->vendor = 0xffff; 177 pdev->device = 0xffff; 178 pdev->sysdata = agp->hose; 179 180 alpha_bridge = agp_alloc_bridge(); 181 if (!alpha_bridge) 182 goto fail; 183 184 alpha_bridge->driver = &alpha_core_agp_driver; 185 alpha_bridge->vm_ops = &alpha_core_agp_vm_ops; 186 alpha_bridge->current_size = aper_size; /* only 1 size */ 187 alpha_bridge->dev_private_data = agp; 188 alpha_bridge->dev = pdev; 189 alpha_bridge->mode = agp->capability.lw; 190 191 printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index); 192 return agp_add_bridge(alpha_bridge); 193 194 fail: 195 kfree(pdev); 196 return -ENOMEM; 197 } 198 199 static int __init agp_alpha_core_init(void) 200 { 201 if (agp_off) 202 return -EINVAL; 203 if (alpha_mv.agp_info) 204 return alpha_core_agp_setup(); 205 return -ENODEV; 206 } 207 208 static void __exit agp_alpha_core_cleanup(void) 209 { 210 agp_remove_bridge(alpha_bridge); 211 agp_put_bridge(alpha_bridge); 212 } 213 214 module_init(agp_alpha_core_init); 215 module_exit(agp_alpha_core_cleanup); 216 217 MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>"); 218 MODULE_LICENSE("GPL and additional rights"); 219