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) return NULL;  /* 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         if (type)
  34                 *type = VM_FAULT_MINOR;
  35         return page;
  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         .nopage = alpha_core_agp_vm_nopage,
  45 };
  46
  47
  48 static int alpha_core_agp_nop(void)
  49 {
  50         /* just return success */
  51         return 0;
  52 }
  53
  54 static int alpha_core_agp_fetch_size(void)
  55 {
  56         return alpha_core_agp_sizes[0].size;
  57 }
  58
  59 static int alpha_core_agp_configure(void)
  60 {
  61         alpha_agp_info *agp = agp_bridge->dev_private_data;
  62         agp_bridge->gart_bus_addr = agp->aperture.bus_base;
  63         return 0;
  64 }
  65
  66 static void alpha_core_agp_cleanup(void)
  67 {
  68         alpha_agp_info *agp = agp_bridge->dev_private_data;
  69
  70         agp->ops->cleanup(agp);
  71 }
  72
  73 static void alpha_core_agp_tlbflush(struct agp_memory *mem)
  74 {
  75         alpha_agp_info *agp = agp_bridge->dev_private_data;
  76         alpha_mv.mv_pci_tbi(agp->hose, 0, -1);
  77 }
  78
  79 static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode)
  80 {
  81         alpha_agp_info *agp = bridge->dev_private_data;
  82
  83         agp->mode.lw = agp_collect_device_status(bridge, mode,
  84                                         agp->capability.lw);
  85
  86         agp->mode.bits.enable = 1;
  87         agp->ops->configure(agp);
  88
  89         agp_device_command(agp->mode.lw, 0);
  90 }
  91
  92 static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start,
  93                                         int type)
  94 {
  95         alpha_agp_info *agp = agp_bridge->dev_private_data;
  96         int num_entries, status;
  97         void *temp;
  98
  99         temp = agp_bridge->current_size;
 100         num_entries = A_SIZE_FIX(temp)->num_entries;
 101         if ((pg_start + mem->page_count) > num_entries) return -EINVAL;
 102
 103         status = agp->ops->bind(agp, pg_start, mem);
 104         mb();
 105         alpha_core_agp_tlbflush(mem);
 106
 107         return status;
 108 }
 109
 110 static int alpha_core_agp_remove_memory(struct agp_memory *mem, off_t pg_start,
 111                                         int type)
 112 {
 113         alpha_agp_info *agp = agp_bridge->dev_private_data;
 114         int status;
 115
 116         status = agp->ops->unbind(agp, pg_start, mem);
 117         alpha_core_agp_tlbflush(mem);
 118         return status;
 119 }
 120
 121 struct agp_bridge_driver alpha_core_agp_driver = {
 122         .owner                  = THIS_MODULE,
 123         .aperture_sizes         = alpha_core_agp_sizes,
 124         .num_aperture_sizes     = 1,
 125         .size_type              = FIXED_APER_SIZE,
 126         .cant_use_aperture      = 1,
 127         .masks                  = NULL,
 128
 129         .fetch_size             = alpha_core_agp_fetch_size,
 130         .configure              = alpha_core_agp_configure,
 131         .agp_enable             = alpha_core_agp_enable,
 132         .cleanup                = alpha_core_agp_cleanup,
 133         .tlb_flush              = alpha_core_agp_tlbflush,
 134         .mask_memory            = agp_generic_mask_memory,
 135         .cache_flush            = global_cache_flush,
 136         .create_gatt_table      = alpha_core_agp_nop,
 137         .free_gatt_table        = alpha_core_agp_nop,
 138         .insert_memory          = alpha_core_agp_insert_memory,
 139         .remove_memory          = alpha_core_agp_remove_memory,
 140         .alloc_by_type          = agp_generic_alloc_by_type,
 141         .free_by_type           = agp_generic_free_by_type,
 142         .agp_alloc_page         = agp_generic_alloc_page,
 143         .agp_destroy_page       = agp_generic_destroy_page,
 144 };
 145
 146 struct agp_bridge_data *alpha_bridge;
 147
 148 int __init
 149 alpha_core_agp_setup(void)
 150 {
 151         alpha_agp_info *agp = alpha_mv.agp_info();
 152         struct pci_dev *pdev;   /* faked */
 153         struct aper_size_info_fixed *aper_size;
 154
 155         if (!agp)
 156                 return -ENODEV;
 157         if (agp->ops->setup(agp))
 158                 return -ENODEV;
 159
 160         /*
 161          * Build the aperture size descriptor
 162          */
 163         aper_size = alpha_core_agp_sizes;
 164         aper_size->size = agp->aperture.size / (1024 * 1024);
 165         aper_size->num_entries = agp->aperture.size / PAGE_SIZE;
 166         aper_size->page_order = __ffs(aper_size->num_entries / 1024);
 167
 168         /*
 169          * Build a fake pci_dev struct
 170          */
 171         pdev = kmalloc(sizeof(struct pci_dev), GFP_KERNEL);
 172         if (!pdev)
 173                 return -ENOMEM;
 174         pdev->vendor = 0xffff;
 175         pdev->device = 0xffff;
 176         pdev->sysdata = agp->hose;
 177
 178         alpha_bridge = agp_alloc_bridge();
 179         if (!alpha_bridge)
 180                 goto fail;
 181
 182         alpha_bridge->driver = &alpha_core_agp_driver;
 183         alpha_bridge->vm_ops = &alpha_core_agp_vm_ops;
 184         alpha_bridge->current_size = aper_size; /* only 1 size */
 185         alpha_bridge->dev_private_data = agp;
 186         alpha_bridge->dev = pdev;
 187         alpha_bridge->mode = agp->capability.lw;
 188
 189         printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index);
 190         return agp_add_bridge(alpha_bridge);
 191
 192  fail:
 193         kfree(pdev);
 194         return -ENOMEM;
 195 }
 196
 197 static int __init agp_alpha_core_init(void)
 198 {
 199         if (agp_off)
 200                 return -EINVAL;
 201         if (alpha_mv.agp_info)
 202                 return alpha_core_agp_setup();
 203         return -ENODEV;
 204 }
 205
 206 static void __exit agp_alpha_core_cleanup(void)
 207 {
 208         agp_remove_bridge(alpha_bridge);
 209         agp_put_bridge(alpha_bridge);
 210 }
 211
 212 module_init(agp_alpha_core_init);
 213 module_exit(agp_alpha_core_cleanup);
 214
 215 MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>");
 216 MODULE_LICENSE("GPL and additional rights");