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 = (unsigned long)vmf->virtual_address - vma->vm_start
  23                                                 + agp->aperture.bus_base;
  24         pa = agp->ops->translate(agp, dma_addr);
  25
  26         if (pa == (unsigned long)-EINVAL)
  27                 return VM_FAULT_SIGBUS; /* 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         vmf->page = page;
  35         return 0;
  36 }
  37
  38 static struct aper_size_info_fixed alpha_core_agp_sizes[] =
  39 {
  40         { 0, 0, 0 }, /* filled in by alpha_core_agp_setup */
  41 };
  42
  43 struct vm_operations_struct alpha_core_agp_vm_ops = {
  44         .fault = alpha_core_agp_vm_fault,
  45 };
  46
  47
  48 static int alpha_core_agp_fetch_size(void)
  49 {
  50         return alpha_core_agp_sizes[0].size;
  51 }
  52
  53 static int alpha_core_agp_configure(void)
  54 {
  55         alpha_agp_info *agp = agp_bridge->dev_private_data;
  56         agp_bridge->gart_bus_addr = agp->aperture.bus_base;
  57         return 0;
  58 }
  59
  60 static void alpha_core_agp_cleanup(void)
  61 {
  62         alpha_agp_info *agp = agp_bridge->dev_private_data;
  63
  64         agp->ops->cleanup(agp);
  65 }
  66
  67 static void alpha_core_agp_tlbflush(struct agp_memory *mem)
  68 {
  69         alpha_agp_info *agp = agp_bridge->dev_private_data;
  70         alpha_mv.mv_pci_tbi(agp->hose, 0, -1);
  71 }
  72
  73 static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode)
  74 {
  75         alpha_agp_info *agp = bridge->dev_private_data;
  76
  77         agp->mode.lw = agp_collect_device_status(bridge, mode,
  78                                         agp->capability.lw);
  79
  80         agp->mode.bits.enable = 1;
  81         agp->ops->configure(agp);
  82
  83         agp_device_command(agp->mode.lw, 0);
  84 }
  85
  86 static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start,
  87                                         int type)
  88 {
  89         alpha_agp_info *agp = agp_bridge->dev_private_data;
  90         int num_entries, status;
  91         void *temp;
  92
  93         if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES)
  94                 return -EINVAL;
  95
  96         temp = agp_bridge->current_size;
  97         num_entries = A_SIZE_FIX(temp)->num_entries;
  98         if ((pg_start + mem->page_count) > num_entries)
  99                 return -EINVAL;
 100
 101         status = agp->ops->bind(agp, pg_start, mem);
 102         mb();
 103         alpha_core_agp_tlbflush(mem);
 104
 105         return status;
 106 }
 107
 108 static int alpha_core_agp_remove_memory(struct agp_memory *mem, off_t pg_start,
 109                                         int type)
 110 {
 111         alpha_agp_info *agp = agp_bridge->dev_private_data;
 112         int status;
 113
 114         status = agp->ops->unbind(agp, pg_start, mem);
 115         alpha_core_agp_tlbflush(mem);
 116         return status;
 117 }
 118
 119 static int alpha_core_agp_create_free_gatt_table(struct agp_bridge_data *a)
 120 {
 121         return 0;
 122 }
 123
 124 struct agp_bridge_driver alpha_core_agp_driver = {
 125         .owner                  = THIS_MODULE,
 126         .aperture_sizes         = alpha_core_agp_sizes,
 127         .num_aperture_sizes     = 1,
 128         .size_type              = FIXED_APER_SIZE,
 129         .cant_use_aperture      = 1,
 130         .masks                  = NULL,
 131
 132         .fetch_size             = alpha_core_agp_fetch_size,
 133         .configure              = alpha_core_agp_configure,
 134         .agp_enable             = alpha_core_agp_enable,
 135         .cleanup                = alpha_core_agp_cleanup,
 136         .tlb_flush              = alpha_core_agp_tlbflush,
 137         .mask_memory            = agp_generic_mask_memory,
 138         .cache_flush            = global_cache_flush,
 139         .create_gatt_table      = alpha_core_agp_create_free_gatt_table,
 140         .free_gatt_table        = alpha_core_agp_create_free_gatt_table,
 141         .insert_memory          = alpha_core_agp_insert_memory,
 142         .remove_memory          = alpha_core_agp_remove_memory,
 143         .alloc_by_type          = agp_generic_alloc_by_type,
 144         .free_by_type           = agp_generic_free_by_type,
 145         .agp_alloc_page         = agp_generic_alloc_page,
 146         .agp_destroy_page       = agp_generic_destroy_page,
 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 = alloc_pci_dev();
 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");