Pull utrace into release branch
[linux-2.6] / 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, false);
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      = true,
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_alloc_pages        = agp_generic_alloc_pages,
147         .agp_destroy_page       = agp_generic_destroy_page,
148         .agp_destroy_pages      = agp_generic_destroy_pages,
149         .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
150 };
151
152 struct agp_bridge_data *alpha_bridge;
153
154 int __init
155 alpha_core_agp_setup(void)
156 {
157         alpha_agp_info *agp = alpha_mv.agp_info();
158         struct pci_dev *pdev;   /* faked */
159         struct aper_size_info_fixed *aper_size;
160
161         if (!agp)
162                 return -ENODEV;
163         if (agp->ops->setup(agp))
164                 return -ENODEV;
165
166         /*
167          * Build the aperture size descriptor
168          */
169         aper_size = alpha_core_agp_sizes;
170         aper_size->size = agp->aperture.size / (1024 * 1024);
171         aper_size->num_entries = agp->aperture.size / PAGE_SIZE;
172         aper_size->page_order = __ffs(aper_size->num_entries / 1024);
173
174         /*
175          * Build a fake pci_dev struct
176          */
177         pdev = alloc_pci_dev();
178         if (!pdev)
179                 return -ENOMEM;
180         pdev->vendor = 0xffff;
181         pdev->device = 0xffff;
182         pdev->sysdata = agp->hose;
183
184         alpha_bridge = agp_alloc_bridge();
185         if (!alpha_bridge)
186                 goto fail;
187
188         alpha_bridge->driver = &alpha_core_agp_driver;
189         alpha_bridge->vm_ops = &alpha_core_agp_vm_ops;
190         alpha_bridge->current_size = aper_size; /* only 1 size */
191         alpha_bridge->dev_private_data = agp;
192         alpha_bridge->dev = pdev;
193         alpha_bridge->mode = agp->capability.lw;
194
195         printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index);
196         return agp_add_bridge(alpha_bridge);
197
198  fail:
199         kfree(pdev);
200         return -ENOMEM;
201 }
202
203 static int __init agp_alpha_core_init(void)
204 {
205         if (agp_off)
206                 return -EINVAL;
207         if (alpha_mv.agp_info)
208                 return alpha_core_agp_setup();
209         return -ENODEV;
210 }
211
212 static void __exit agp_alpha_core_cleanup(void)
213 {
214         agp_remove_bridge(alpha_bridge);
215         agp_put_bridge(alpha_bridge);
216 }
217
218 module_init(agp_alpha_core_init);
219 module_exit(agp_alpha_core_cleanup);
220
221 MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>");
222 MODULE_LICENSE("GPL and additional rights");