drivers/char/agp/alpha-agp.c

   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");