]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/alpha/kernel/pci-sysfs.c
2 * arch/alpha/kernel/pci-sysfs.c
4 * Copyright (C) 2009 Ivan Kokshaysky
6 * Alpha PCI resource files.
8 * Loosely based on generic HAVE_PCI_MMAP implementation in
9 * drivers/pci/pci-sysfs.c
12 #include <linux/sched.h>
13 #include <linux/slab.h>
14 #include <linux/pci.h>
16 static int hose_mmap_page_range(struct pci_controller
*hose
,
17 struct vm_area_struct
*vma
,
18 enum pci_mmap_state mmap_type
, int sparse
)
22 if (mmap_type
== pci_mmap_mem
)
23 base
= sparse
? hose
->sparse_mem_base
: hose
->dense_mem_base
;
25 base
= sparse
? hose
->sparse_io_base
: hose
->dense_io_base
;
27 vma
->vm_pgoff
+= base
>> PAGE_SHIFT
;
28 vma
->vm_flags
|= (VM_IO
| VM_RESERVED
);
30 return io_remap_pfn_range(vma
, vma
->vm_start
, vma
->vm_pgoff
,
31 vma
->vm_end
- vma
->vm_start
,
35 static int __pci_mmap_fits(struct pci_dev
*pdev
, int num
,
36 struct vm_area_struct
*vma
, int sparse
)
38 unsigned long nr
, start
, size
;
39 int shift
= sparse
? 5 : 0;
41 nr
= (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
42 start
= vma
->vm_pgoff
;
43 size
= ((pci_resource_len(pdev
, num
) - 1) >> (PAGE_SHIFT
- shift
)) + 1;
45 if (start
< size
&& size
- start
>= nr
)
47 WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on %s BAR %d "
49 current
->comm
, sparse
? " sparse" : "", start
, start
+ nr
,
50 pci_name(pdev
), num
, size
);
55 * pci_mmap_resource - map a PCI resource into user memory space
56 * @kobj: kobject for mapping
57 * @attr: struct bin_attribute for the file being mapped
58 * @vma: struct vm_area_struct passed into the mmap
59 * @sparse: address space type
61 * Use the bus mapping routines to map a PCI resource into userspace.
63 static int pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
64 struct vm_area_struct
*vma
, int sparse
)
66 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
67 struct device
, kobj
));
68 struct resource
*res
= (struct resource
*)attr
->private;
69 enum pci_mmap_state mmap_type
;
70 struct pci_bus_region bar
;
73 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
74 if (res
== &pdev
->resource
[i
])
76 if (i
>= PCI_ROM_RESOURCE
)
79 if (!__pci_mmap_fits(pdev
, i
, vma
, sparse
))
82 if (iomem_is_exclusive(res
->start
))
85 pcibios_resource_to_bus(pdev
, &bar
, res
);
86 vma
->vm_pgoff
+= bar
.start
>> (PAGE_SHIFT
- (sparse
? 5 : 0));
87 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
89 return hose_mmap_page_range(pdev
->sysdata
, vma
, mmap_type
, sparse
);
92 static int pci_mmap_resource_sparse(struct kobject
*kobj
,
93 struct bin_attribute
*attr
,
94 struct vm_area_struct
*vma
)
96 return pci_mmap_resource(kobj
, attr
, vma
, 1);
99 static int pci_mmap_resource_dense(struct kobject
*kobj
,
100 struct bin_attribute
*attr
,
101 struct vm_area_struct
*vma
)
103 return pci_mmap_resource(kobj
, attr
, vma
, 0);
107 * pci_remove_resource_files - cleanup resource files
108 * @dev: dev to cleanup
110 * If we created resource files for @dev, remove them from sysfs and
111 * free their resources.
113 void pci_remove_resource_files(struct pci_dev
*pdev
)
117 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
118 struct bin_attribute
*res_attr
;
120 res_attr
= pdev
->res_attr
[i
];
122 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
126 res_attr
= pdev
->res_attr_wc
[i
];
128 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
134 static int sparse_mem_mmap_fits(struct pci_dev
*pdev
, int num
)
136 struct pci_bus_region bar
;
137 struct pci_controller
*hose
= pdev
->sysdata
;
139 unsigned long sparse_size
;
141 pcibios_resource_to_bus(pdev
, &bar
, &pdev
->resource
[num
]);
143 /* All core logic chips have 4G sparse address space, except
144 CIA which has 16G (see xxx_SPARSE_MEM and xxx_DENSE_MEM
145 definitions in asm/core_xxx.h files). This corresponds
146 to 128M or 512M of the bus space. */
147 dense_offset
= (long)(hose
->dense_mem_base
- hose
->sparse_mem_base
);
148 sparse_size
= dense_offset
>= 0x400000000UL
? 0x20000000 : 0x8000000;
150 return bar
.end
< sparse_size
;
153 static int pci_create_one_attr(struct pci_dev
*pdev
, int num
, char *name
,
154 char *suffix
, struct bin_attribute
*res_attr
,
155 unsigned long sparse
)
157 size_t size
= pci_resource_len(pdev
, num
);
159 sprintf(name
, "resource%d%s", num
, suffix
);
160 res_attr
->mmap
= sparse
? pci_mmap_resource_sparse
:
161 pci_mmap_resource_dense
;
162 res_attr
->attr
.name
= name
;
163 res_attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
164 res_attr
->size
= sparse
? size
<< 5 : size
;
165 res_attr
->private = &pdev
->resource
[num
];
166 return sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
169 static int pci_create_attr(struct pci_dev
*pdev
, int num
)
171 /* allocate attribute structure, piggyback attribute name */
172 int retval
, nlen1
, nlen2
= 0, res_count
= 1;
173 unsigned long sparse_base
, dense_base
;
174 struct bin_attribute
*attr
;
175 struct pci_controller
*hose
= pdev
->sysdata
;
176 char *suffix
, *attr_name
;
178 suffix
= ""; /* Assume bwx machine, normal resourceN files. */
181 if (pdev
->resource
[num
].flags
& IORESOURCE_MEM
) {
182 sparse_base
= hose
->sparse_mem_base
;
183 dense_base
= hose
->dense_mem_base
;
184 if (sparse_base
&& !sparse_mem_mmap_fits(pdev
, num
)) {
187 nlen1
= 16; /* resourceN_dense */
190 sparse_base
= hose
->sparse_io_base
;
191 dense_base
= hose
->dense_io_base
;
198 nlen2
= 16; /* resourceN_dense */
203 attr
= kzalloc(sizeof(*attr
) * res_count
+ nlen1
+ nlen2
, GFP_ATOMIC
);
207 /* Create bwx, sparse or single dense file */
208 attr_name
= (char *)(attr
+ res_count
);
209 pdev
->res_attr
[num
] = attr
;
210 retval
= pci_create_one_attr(pdev
, num
, attr_name
, suffix
, attr
,
212 if (retval
|| res_count
== 1)
215 /* Create dense file */
218 pdev
->res_attr_wc
[num
] = attr
;
219 return pci_create_one_attr(pdev
, num
, attr_name
, "_dense", attr
, 0);
223 * pci_create_resource_files - create resource files in sysfs for @dev
224 * @dev: dev in question
226 * Walk the resources in @dev creating files for each resource available.
228 int pci_create_resource_files(struct pci_dev
*pdev
)
233 /* Expose the PCI resources from this device as files */
234 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
236 /* skip empty resources */
237 if (!pci_resource_len(pdev
, i
))
240 retval
= pci_create_attr(pdev
, i
);
242 pci_remove_resource_files(pdev
);
249 /* Legacy I/O bus mapping stuff. */
251 static int __legacy_mmap_fits(struct pci_controller
*hose
,
252 struct vm_area_struct
*vma
,
253 unsigned long res_size
, int sparse
)
255 unsigned long nr
, start
, size
;
257 nr
= (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
258 start
= vma
->vm_pgoff
;
259 size
= ((res_size
- 1) >> PAGE_SHIFT
) + 1;
261 if (start
< size
&& size
- start
>= nr
)
263 WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on hose %d "
265 current
->comm
, sparse
? " sparse" : "", start
, start
+ nr
,
270 static inline int has_sparse(struct pci_controller
*hose
,
271 enum pci_mmap_state mmap_type
)
275 base
= (mmap_type
== pci_mmap_mem
) ? hose
->sparse_mem_base
:
276 hose
->sparse_io_base
;
281 int pci_mmap_legacy_page_range(struct pci_bus
*bus
, struct vm_area_struct
*vma
,
282 enum pci_mmap_state mmap_type
)
284 struct pci_controller
*hose
= bus
->sysdata
;
285 int sparse
= has_sparse(hose
, mmap_type
);
286 unsigned long res_size
;
288 res_size
= (mmap_type
== pci_mmap_mem
) ? bus
->legacy_mem
->size
:
289 bus
->legacy_io
->size
;
290 if (!__legacy_mmap_fits(hose
, vma
, res_size
, sparse
))
293 return hose_mmap_page_range(hose
, vma
, mmap_type
, sparse
);
297 * pci_adjust_legacy_attr - adjustment of legacy file attributes
298 * @b: bus to create files under
299 * @mmap_type: I/O port or memory
301 * Adjust file name and size for sparse mappings.
303 void pci_adjust_legacy_attr(struct pci_bus
*bus
, enum pci_mmap_state mmap_type
)
305 struct pci_controller
*hose
= bus
->sysdata
;
307 if (!has_sparse(hose
, mmap_type
))
310 if (mmap_type
== pci_mmap_mem
) {
311 bus
->legacy_mem
->attr
.name
= "legacy_mem_sparse";
312 bus
->legacy_mem
->size
<<= 5;
314 bus
->legacy_io
->attr
.name
= "legacy_io_sparse";
315 bus
->legacy_io
->size
<<= 5;
320 /* Legacy I/O bus read/write functions */
321 int pci_legacy_read(struct pci_bus
*bus
, loff_t port
, u32
*val
, size_t size
)
323 struct pci_controller
*hose
= bus
->sysdata
;
325 port
+= hose
->io_space
->start
;
329 *((u8
*)val
) = inb(port
);
334 *((u16
*)val
) = inw(port
);
339 *((u32
*)val
) = inl(port
);
345 int pci_legacy_write(struct pci_bus
*bus
, loff_t port
, u32 val
, size_t size
)
347 struct pci_controller
*hose
= bus
->sysdata
;
349 port
+= hose
->io_space
->start
;