xref: /linux/drivers/char/agp/alpha-agp.c (revision a1ff5a7d78a036d6c2178ee5acd6ba4946243800)
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 
alpha_core_agp_vm_fault(struct vm_fault * vmf)14 static vm_fault_t alpha_core_agp_vm_fault(struct vm_fault *vmf)
15 {
16 	alpha_agp_info *agp = agp_bridge->dev_private_data;
17 	dma_addr_t dma_addr;
18 	unsigned long pa;
19 	struct page *page;
20 
21 	dma_addr = vmf->address - vmf->vma->vm_start + agp->aperture.bus_base;
22 	pa = agp->ops->translate(agp, dma_addr);
23 
24 	if (pa == (unsigned long)-EINVAL)
25 		return VM_FAULT_SIGBUS;	/* no translation */
26 
27 	/*
28 	 * Get the page, inc the use count, and return it
29 	 */
30 	page = virt_to_page(__va(pa));
31 	get_page(page);
32 	vmf->page = page;
33 	return 0;
34 }
35 
36 static struct aper_size_info_fixed alpha_core_agp_sizes[] =
37 {
38 	{ 0, 0, 0 }, /* filled in by alpha_core_agp_setup */
39 };
40 
41 static const struct vm_operations_struct alpha_core_agp_vm_ops = {
42 	.fault = alpha_core_agp_vm_fault,
43 };
44 
45 
alpha_core_agp_fetch_size(void)46 static int alpha_core_agp_fetch_size(void)
47 {
48 	return alpha_core_agp_sizes[0].size;
49 }
50 
alpha_core_agp_configure(void)51 static int alpha_core_agp_configure(void)
52 {
53 	alpha_agp_info *agp = agp_bridge->dev_private_data;
54 	agp_bridge->gart_bus_addr = agp->aperture.bus_base;
55 	return 0;
56 }
57 
alpha_core_agp_cleanup(void)58 static void alpha_core_agp_cleanup(void)
59 {
60 	alpha_agp_info *agp = agp_bridge->dev_private_data;
61 
62 	agp->ops->cleanup(agp);
63 }
64 
alpha_core_agp_tlbflush(struct agp_memory * mem)65 static void alpha_core_agp_tlbflush(struct agp_memory *mem)
66 {
67 	alpha_agp_info *agp = agp_bridge->dev_private_data;
68 	alpha_mv.mv_pci_tbi(agp->hose, 0, -1);
69 }
70 
alpha_core_agp_enable(struct agp_bridge_data * bridge,u32 mode)71 static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode)
72 {
73 	alpha_agp_info *agp = bridge->dev_private_data;
74 
75 	agp->mode.lw = agp_collect_device_status(bridge, mode,
76 					agp->capability.lw);
77 
78 	agp->mode.bits.enable = 1;
79 	agp->ops->configure(agp);
80 
81 	agp_device_command(agp->mode.lw, false);
82 }
83 
alpha_core_agp_insert_memory(struct agp_memory * mem,off_t pg_start,int type)84 static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start,
85 					int type)
86 {
87 	alpha_agp_info *agp = agp_bridge->dev_private_data;
88 	int num_entries, status;
89 	void *temp;
90 
91 	if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES)
92 		return -EINVAL;
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 
alpha_core_agp_remove_memory(struct agp_memory * mem,off_t pg_start,int type)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 
alpha_core_agp_create_free_gatt_table(struct agp_bridge_data * a)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	= true,
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_alloc_pages	= agp_generic_alloc_pages,
145 	.agp_destroy_page	= agp_generic_destroy_page,
146 	.agp_destroy_pages	= agp_generic_destroy_pages,
147 	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
148 };
149 
150 struct agp_bridge_data *alpha_bridge;
151 
152 static int __init
alpha_core_agp_setup(void)153 alpha_core_agp_setup(void)
154 {
155 	alpha_agp_info *agp = alpha_mv.agp_info();
156 	struct pci_dev *pdev;	/* faked */
157 	struct aper_size_info_fixed *aper_size;
158 
159 	if (!agp)
160 		return -ENODEV;
161 	if (agp->ops->setup(agp))
162 		return -ENODEV;
163 
164 	/*
165 	 * Build the aperture size descriptor
166 	 */
167 	aper_size = alpha_core_agp_sizes;
168 	aper_size->size = agp->aperture.size / (1024 * 1024);
169 	aper_size->num_entries = agp->aperture.size / PAGE_SIZE;
170 	aper_size->page_order = __ffs(aper_size->num_entries / 1024);
171 
172 	/*
173 	 * Build a fake pci_dev struct
174 	 */
175 	pdev = pci_alloc_dev(NULL);
176 	if (!pdev)
177 		return -ENOMEM;
178 	pdev->vendor = 0xffff;
179 	pdev->device = 0xffff;
180 	pdev->sysdata = agp->hose;
181 
182 	alpha_bridge = agp_alloc_bridge();
183 	if (!alpha_bridge)
184 		goto fail;
185 
186 	alpha_bridge->driver = &alpha_core_agp_driver;
187 	alpha_bridge->vm_ops = &alpha_core_agp_vm_ops;
188 	alpha_bridge->current_size = aper_size; /* only 1 size */
189 	alpha_bridge->dev_private_data = agp;
190 	alpha_bridge->dev = pdev;
191 	alpha_bridge->mode = agp->capability.lw;
192 
193 	printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index);
194 	return agp_add_bridge(alpha_bridge);
195 
196  fail:
197 	kfree(pdev);
198 	return -ENOMEM;
199 }
200 
agp_alpha_core_init(void)201 static int __init agp_alpha_core_init(void)
202 {
203 	if (agp_off)
204 		return -EINVAL;
205 	if (alpha_mv.agp_info)
206 		return alpha_core_agp_setup();
207 	return -ENODEV;
208 }
209 
agp_alpha_core_cleanup(void)210 static void __exit agp_alpha_core_cleanup(void)
211 {
212 	agp_remove_bridge(alpha_bridge);
213 	agp_put_bridge(alpha_bridge);
214 }
215 
216 module_init(agp_alpha_core_init);
217 module_exit(agp_alpha_core_cleanup);
218 
219 MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>");
220 MODULE_DESCRIPTION("Alpha AGP support");
221 MODULE_LICENSE("GPL and additional rights");
222