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 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");