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_fetch_size(void)
  50 {
  51         return alpha_core_agp_sizes[0].size;
  52 }
  53
  54 static int alpha_core_agp_configure(void)
  55 {
  56         alpha_agp_info *agp = agp_bridge->dev_private_data;
  57         agp_bridge->gart_bus_addr = agp->aperture.bus_base;
  58         return 0;
  59 }
  60
  61 static void alpha_core_agp_cleanup(void)
  62 {
  63         alpha_agp_info *agp = agp_bridge->dev_private_data;
  64
  65         agp->ops->cleanup(agp);
  66 }
  67
  68 static void alpha_core_agp_tlbflush(struct agp_memory *mem)
  69 {
  70         alpha_agp_info *agp = agp_bridge->dev_private_data;
  71         alpha_mv.mv_pci_tbi(agp->hose, 0, -1);
  72 }
  73
  74 static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode)
  75 {
  76         alpha_agp_info *agp = bridge->dev_private_data;
  77
  78         agp->mode.lw = agp_collect_device_status(bridge, mode,
  79                                         agp->capability.lw);
  80
  81         agp->mode.bits.enable = 1;
  82         agp->ops->configure(agp);
  83
  84         agp_device_command(agp->mode.lw, 0);
  85 }
  86
  87 static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start,
  88                                         int type)
  89 {
  90         alpha_agp_info *agp = agp_bridge->dev_private_data;
  91         int num_entries, status;
  92         void *temp;
  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      = 1,
 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_destroy_page       = agp_generic_destroy_page,
 145 };
 146
 147 struct agp_bridge_data *alpha_bridge;
 148
 149 int __init
 150 alpha_core_agp_setup(void)
 151 {
 152         alpha_agp_info *agp = alpha_mv.agp_info();
 153         struct pci_dev *pdev;   /* faked */
 154         struct aper_size_info_fixed *aper_size;
 155
 156         if (!agp)
 157                 return -ENODEV;
 158         if (agp->ops->setup(agp))
 159                 return -ENODEV;
 160
 161         /*
 162          * Build the aperture size descriptor
 163          */
 164         aper_size = alpha_core_agp_sizes;
 165         aper_size->size = agp->aperture.size / (1024 * 1024);
 166         aper_size->num_entries = agp->aperture.size / PAGE_SIZE;
 167         aper_size->page_order = __ffs(aper_size->num_entries / 1024);
 168
 169         /*
 170          * Build a fake pci_dev struct
 171          */
 172         pdev = kmalloc(sizeof(struct pci_dev), GFP_KERNEL);
 173         if (!pdev)
 174                 return -ENOMEM;
 175         pdev->vendor = 0xffff;
 176         pdev->device = 0xffff;
 177         pdev->sysdata = agp->hose;
 178
 179         alpha_bridge = agp_alloc_bridge();
 180         if (!alpha_bridge)
 181                 goto fail;
 182
 183         alpha_bridge->driver = &alpha_core_agp_driver;
 184         alpha_bridge->vm_ops = &alpha_core_agp_vm_ops;
 185         alpha_bridge->current_size = aper_size; /* only 1 size */
 186         alpha_bridge->dev_private_data = agp;
 187         alpha_bridge->dev = pdev;
 188         alpha_bridge->mode = agp->capability.lw;
 189
 190         printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index);
 191         return agp_add_bridge(alpha_bridge);
 192
 193  fail:
 194         kfree(pdev);
 195         return -ENOMEM;
 196 }
 197
 198 static int __init agp_alpha_core_init(void)
 199 {
 200         if (agp_off)
 201                 return -EINVAL;
 202         if (alpha_mv.agp_info)
 203                 return alpha_core_agp_setup();
 204         return -ENODEV;
 205 }
 206
 207 static void __exit agp_alpha_core_cleanup(void)
 208 {
 209         agp_remove_bridge(alpha_bridge);
 210         agp_put_bridge(alpha_bridge);
 211 }
 212
 213 module_init(agp_alpha_core_init);
 214 module_exit(agp_alpha_core_cleanup);
 215
 216 MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>");
 217 MODULE_LICENSE("GPL and additional rights");