Input: xpad - add support for Xbox1 PDP Camo series gamepad
[linux/fpc-iii.git] / drivers / gpu / drm / ttm / ttm_agp_backend.c
blob028ab6007873c443b6432e4fd5fe0a4ed09d866d
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28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29 * Keith Packard.
32 #define pr_fmt(fmt) "[TTM] " fmt
34 #include <drm/ttm/ttm_module.h>
35 #include <drm/ttm/ttm_bo_driver.h>
36 #include <drm/ttm/ttm_page_alloc.h>
37 #include <drm/ttm/ttm_placement.h>
38 #include <linux/agp_backend.h>
39 #include <linux/module.h>
40 #include <linux/slab.h>
41 #include <linux/io.h>
42 #include <asm/agp.h>
44 struct ttm_agp_backend {
45 struct ttm_tt ttm;
46 struct agp_memory *mem;
47 struct agp_bridge_data *bridge;
50 static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
52 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
53 struct drm_mm_node *node = bo_mem->mm_node;
54 struct agp_memory *mem;
55 int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
56 unsigned i;
58 mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
59 if (unlikely(mem == NULL))
60 return -ENOMEM;
62 mem->page_count = 0;
63 for (i = 0; i < ttm->num_pages; i++) {
64 struct page *page = ttm->pages[i];
66 if (!page)
67 page = ttm->dummy_read_page;
69 mem->pages[mem->page_count++] = page;
71 agp_be->mem = mem;
73 mem->is_flushed = 1;
74 mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
76 ret = agp_bind_memory(mem, node->start);
77 if (ret)
78 pr_err("AGP Bind memory failed\n");
80 return ret;
83 static int ttm_agp_unbind(struct ttm_tt *ttm)
85 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
87 if (agp_be->mem) {
88 if (agp_be->mem->is_bound)
89 return agp_unbind_memory(agp_be->mem);
90 agp_free_memory(agp_be->mem);
91 agp_be->mem = NULL;
93 return 0;
96 static void ttm_agp_destroy(struct ttm_tt *ttm)
98 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
100 if (agp_be->mem)
101 ttm_agp_unbind(ttm);
102 ttm_tt_fini(ttm);
103 kfree(agp_be);
106 static struct ttm_backend_func ttm_agp_func = {
107 .bind = ttm_agp_bind,
108 .unbind = ttm_agp_unbind,
109 .destroy = ttm_agp_destroy,
112 struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
113 struct agp_bridge_data *bridge,
114 unsigned long size, uint32_t page_flags,
115 struct page *dummy_read_page)
117 struct ttm_agp_backend *agp_be;
119 agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
120 if (!agp_be)
121 return NULL;
123 agp_be->mem = NULL;
124 agp_be->bridge = bridge;
125 agp_be->ttm.func = &ttm_agp_func;
127 if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags, dummy_read_page)) {
128 kfree(agp_be);
129 return NULL;
132 return &agp_be->ttm;
134 EXPORT_SYMBOL(ttm_agp_tt_create);
136 int ttm_agp_tt_populate(struct ttm_tt *ttm)
138 if (ttm->state != tt_unpopulated)
139 return 0;
141 return ttm_pool_populate(ttm);
143 EXPORT_SYMBOL(ttm_agp_tt_populate);
145 void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
147 ttm_pool_unpopulate(ttm);
149 EXPORT_SYMBOL(ttm_agp_tt_unpopulate);