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 vm_fault_t alpha_core_agp_vm_fault(struct vm_fault *vmf)
  15 {
  16         alpha_agp_info *agp = agp_bridge->dev_private_data;
  17         dma_addr_t dma_addr;
  18         unsigned long pa;
  19         struct page *page;
  20
  21         dma_addr = vmf->address - vmf->vma->vm_start + agp->aperture.bus_base;
  22         pa = agp->ops->translate(agp, dma_addr);
  23
  24         if (pa == (unsigned long)-EINVAL)
  25                 return VM_FAULT_SIGBUS; /* no translation */
  26
  27         /*
  28          * Get the page, inc the use count, and return it
  29          */
  30         page = virt_to_page(__va(pa));
  31         get_page(page);
  32         vmf->page = page;
  33         return 0;
  34 }
  35
  36 static struct aper_size_info_fixed alpha_core_agp_sizes[] =
  37 {
  38         { 0, 0, 0 }, /* filled in by alpha_core_agp_setup */
  39 };
  40
  41 static const struct vm_operations_struct alpha_core_agp_vm_ops = {
  42         .fault = alpha_core_agp_vm_fault,
  43 };
  44
  45
  46 static int alpha_core_agp_fetch_size(void)
  47 {
  48         return alpha_core_agp_sizes[0].size;
  49 }
  50
  51 static int alpha_core_agp_configure(void)
  52 {
  53         alpha_agp_info *agp = agp_bridge->dev_private_data;
  54         agp_bridge->gart_bus_addr = agp->aperture.bus_base;
  55         return 0;
  56 }
  57
  58 static void alpha_core_agp_cleanup(void)
  59 {
  60         alpha_agp_info *agp = agp_bridge->dev_private_data;
  61
  62         agp->ops->cleanup(agp);
  63 }
  64
  65 static void alpha_core_agp_tlbflush(struct agp_memory *mem)
  66 {
  67         alpha_agp_info *agp = agp_bridge->dev_private_data;
  68         alpha_mv.mv_pci_tbi(agp->hose, 0, -1);
  69 }
  70
  71 static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode)
  72 {
  73         alpha_agp_info *agp = bridge->dev_private_data;
  74
  75         agp->mode.lw = agp_collect_device_status(bridge, mode,
  76                                         agp->capability.lw);
  77
  78         agp->mode.bits.enable = 1;
  79         agp->ops->configure(agp);
  80
  81         agp_device_command(agp->mode.lw, false);
  82 }
  83
  84 static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start,
  85                                         int type)
  86 {
  87         alpha_agp_info *agp = agp_bridge->dev_private_data;
  88         int num_entries, status;
  89         void *temp;
  90
  91         if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES)
  92                 return -EINVAL;
  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      = true,
 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_alloc_pages        = agp_generic_alloc_pages,
 145         .agp_destroy_page       = agp_generic_destroy_page,
 146         .agp_destroy_pages      = agp_generic_destroy_pages,
 147         .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
 148 };
 149
 150 struct agp_bridge_data *alpha_bridge;
 151
 152 int __init
 153 alpha_core_agp_setup(void)
 154 {
 155         alpha_agp_info *agp = alpha_mv.agp_info();
 156         struct pci_dev *pdev;   /* faked */
 157         struct aper_size_info_fixed *aper_size;
 158
 159         if (!agp)
 160                 return -ENODEV;
 161         if (agp->ops->setup(agp))
 162                 return -ENODEV;
 163
 164         /*
 165          * Build the aperture size descriptor
 166          */
 167         aper_size = alpha_core_agp_sizes;
 168         aper_size->size = agp->aperture.size / (1024 * 1024);
 169         aper_size->num_entries = agp->aperture.size / PAGE_SIZE;
 170         aper_size->page_order = __ffs(aper_size->num_entries / 1024);
 171
 172         /*
 173          * Build a fake pci_dev struct
 174          */
 175         pdev = pci_alloc_dev(NULL);
 176         if (!pdev)
 177                 return -ENOMEM;
 178         pdev->vendor = 0xffff;
 179         pdev->device = 0xffff;
 180         pdev->sysdata = agp->hose;
 181
 182         alpha_bridge = agp_alloc_bridge();
 183         if (!alpha_bridge)
 184                 goto fail;
 185
 186         alpha_bridge->driver = &alpha_core_agp_driver;
 187         alpha_bridge->vm_ops = &alpha_core_agp_vm_ops;
 188         alpha_bridge->current_size = aper_size; /* only 1 size */
 189         alpha_bridge->dev_private_data = agp;
 190         alpha_bridge->dev = pdev;
 191         alpha_bridge->mode = agp->capability.lw;
 192
 193         printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index);
 194         return agp_add_bridge(alpha_bridge);
 195
 196  fail:
 197         kfree(pdev);
 198         return -ENOMEM;
 199 }
 200
 201 static int __init agp_alpha_core_init(void)
 202 {
 203         if (agp_off)
 204                 return -EINVAL;
 205         if (alpha_mv.agp_info)
 206                 return alpha_core_agp_setup();
 207         return -ENODEV;
 208 }
 209
 210 static void __exit agp_alpha_core_cleanup(void)
 211 {
 212         agp_remove_bridge(alpha_bridge);
 213         agp_put_bridge(alpha_bridge);
 214 }
 215
 216 module_init(agp_alpha_core_init);
 217 module_exit(agp_alpha_core_cleanup);
 218
 219 MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>");
 220 MODULE_LICENSE("GPL and additional rights");