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1 | /* |
2 | * arch/alpha/kernel/pci-sysfs.c | |
3 | * | |
4 | * Copyright (C) 2009 Ivan Kokshaysky | |
5 | * | |
6 | * Alpha PCI resource files. | |
7 | * | |
8 | * Loosely based on generic HAVE_PCI_MMAP implementation in | |
9 | * drivers/pci/pci-sysfs.c | |
10 | */ | |
11 | ||
12 | #include <linux/sched.h> | |
ce7cf073 | 13 | #include <linux/stat.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
10a0ef39 IK |
15 | #include <linux/pci.h> |
16 | ||
17 | static int hose_mmap_page_range(struct pci_controller *hose, | |
18 | struct vm_area_struct *vma, | |
19 | enum pci_mmap_state mmap_type, int sparse) | |
20 | { | |
21 | unsigned long base; | |
22 | ||
23 | if (mmap_type == pci_mmap_mem) | |
24 | base = sparse ? hose->sparse_mem_base : hose->dense_mem_base; | |
25 | else | |
26 | base = sparse ? hose->sparse_io_base : hose->dense_io_base; | |
27 | ||
28 | vma->vm_pgoff += base >> PAGE_SHIFT; | |
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29 | |
30 | return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, | |
31 | vma->vm_end - vma->vm_start, | |
32 | vma->vm_page_prot); | |
33 | } | |
34 | ||
35 | static int __pci_mmap_fits(struct pci_dev *pdev, int num, | |
36 | struct vm_area_struct *vma, int sparse) | |
37 | { | |
38 | unsigned long nr, start, size; | |
39 | int shift = sparse ? 5 : 0; | |
40 | ||
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; | |
44 | ||
45 | if (start < size && size - start >= nr) | |
46 | return 1; | |
47 | WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on %s BAR %d " | |
48 | "(size 0x%08lx)\n", | |
49 | current->comm, sparse ? " sparse" : "", start, start + nr, | |
50 | pci_name(pdev), num, size); | |
51 | return 0; | |
52 | } | |
53 | ||
54 | /** | |
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 | |
60 | * | |
61 | * Use the bus mapping routines to map a PCI resource into userspace. | |
62 | */ | |
5efa16ff | 63 | static int pci_mmap_resource(struct kobject *kobj, |
2c3c8bea | 64 | struct bin_attribute *attr, |
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65 | struct vm_area_struct *vma, int sparse) |
66 | { | |
67 | struct pci_dev *pdev = to_pci_dev(container_of(kobj, | |
68 | struct device, kobj)); | |
af96f8a3 | 69 | struct resource *res = attr->private; |
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70 | enum pci_mmap_state mmap_type; |
71 | struct pci_bus_region bar; | |
72 | int i; | |
73 | ||
74 | for (i = 0; i < PCI_ROM_RESOURCE; i++) | |
75 | if (res == &pdev->resource[i]) | |
76 | break; | |
77 | if (i >= PCI_ROM_RESOURCE) | |
78 | return -ENODEV; | |
79 | ||
c20e1280 | 80 | if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start)) |
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81 | return -EINVAL; |
82 | ||
c20e1280 | 83 | if (!__pci_mmap_fits(pdev, i, vma, sparse)) |
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84 | return -EINVAL; |
85 | ||
fc279850 | 86 | pcibios_resource_to_bus(pdev->bus, &bar, res); |
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87 | vma->vm_pgoff += bar.start >> (PAGE_SHIFT - (sparse ? 5 : 0)); |
88 | mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; | |
89 | ||
90 | return hose_mmap_page_range(pdev->sysdata, vma, mmap_type, sparse); | |
91 | } | |
92 | ||
2c3c8bea | 93 | static int pci_mmap_resource_sparse(struct file *filp, struct kobject *kobj, |
10a0ef39 IK |
94 | struct bin_attribute *attr, |
95 | struct vm_area_struct *vma) | |
96 | { | |
97 | return pci_mmap_resource(kobj, attr, vma, 1); | |
98 | } | |
99 | ||
2c3c8bea | 100 | static int pci_mmap_resource_dense(struct file *filp, struct kobject *kobj, |
10a0ef39 IK |
101 | struct bin_attribute *attr, |
102 | struct vm_area_struct *vma) | |
103 | { | |
104 | return pci_mmap_resource(kobj, attr, vma, 0); | |
105 | } | |
106 | ||
107 | /** | |
108 | * pci_remove_resource_files - cleanup resource files | |
109 | * @dev: dev to cleanup | |
110 | * | |
111 | * If we created resource files for @dev, remove them from sysfs and | |
112 | * free their resources. | |
113 | */ | |
114 | void pci_remove_resource_files(struct pci_dev *pdev) | |
115 | { | |
116 | int i; | |
117 | ||
118 | for (i = 0; i < PCI_ROM_RESOURCE; i++) { | |
119 | struct bin_attribute *res_attr; | |
120 | ||
121 | res_attr = pdev->res_attr[i]; | |
122 | if (res_attr) { | |
123 | sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); | |
124 | kfree(res_attr); | |
125 | } | |
126 | ||
127 | res_attr = pdev->res_attr_wc[i]; | |
128 | if (res_attr) { | |
129 | sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); | |
130 | kfree(res_attr); | |
131 | } | |
132 | } | |
133 | } | |
134 | ||
135 | static int sparse_mem_mmap_fits(struct pci_dev *pdev, int num) | |
136 | { | |
137 | struct pci_bus_region bar; | |
138 | struct pci_controller *hose = pdev->sysdata; | |
139 | long dense_offset; | |
140 | unsigned long sparse_size; | |
141 | ||
fc279850 | 142 | pcibios_resource_to_bus(pdev->bus, &bar, &pdev->resource[num]); |
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143 | |
144 | /* All core logic chips have 4G sparse address space, except | |
145 | CIA which has 16G (see xxx_SPARSE_MEM and xxx_DENSE_MEM | |
146 | definitions in asm/core_xxx.h files). This corresponds | |
147 | to 128M or 512M of the bus space. */ | |
148 | dense_offset = (long)(hose->dense_mem_base - hose->sparse_mem_base); | |
149 | sparse_size = dense_offset >= 0x400000000UL ? 0x20000000 : 0x8000000; | |
150 | ||
151 | return bar.end < sparse_size; | |
152 | } | |
153 | ||
154 | static int pci_create_one_attr(struct pci_dev *pdev, int num, char *name, | |
155 | char *suffix, struct bin_attribute *res_attr, | |
156 | unsigned long sparse) | |
157 | { | |
158 | size_t size = pci_resource_len(pdev, num); | |
159 | ||
160 | sprintf(name, "resource%d%s", num, suffix); | |
161 | res_attr->mmap = sparse ? pci_mmap_resource_sparse : | |
162 | pci_mmap_resource_dense; | |
163 | res_attr->attr.name = name; | |
164 | res_attr->attr.mode = S_IRUSR | S_IWUSR; | |
165 | res_attr->size = sparse ? size << 5 : size; | |
166 | res_attr->private = &pdev->resource[num]; | |
167 | return sysfs_create_bin_file(&pdev->dev.kobj, res_attr); | |
168 | } | |
169 | ||
170 | static int pci_create_attr(struct pci_dev *pdev, int num) | |
171 | { | |
172 | /* allocate attribute structure, piggyback attribute name */ | |
173 | int retval, nlen1, nlen2 = 0, res_count = 1; | |
174 | unsigned long sparse_base, dense_base; | |
175 | struct bin_attribute *attr; | |
176 | struct pci_controller *hose = pdev->sysdata; | |
177 | char *suffix, *attr_name; | |
178 | ||
179 | suffix = ""; /* Assume bwx machine, normal resourceN files. */ | |
180 | nlen1 = 10; | |
181 | ||
182 | if (pdev->resource[num].flags & IORESOURCE_MEM) { | |
183 | sparse_base = hose->sparse_mem_base; | |
184 | dense_base = hose->dense_mem_base; | |
185 | if (sparse_base && !sparse_mem_mmap_fits(pdev, num)) { | |
186 | sparse_base = 0; | |
187 | suffix = "_dense"; | |
188 | nlen1 = 16; /* resourceN_dense */ | |
189 | } | |
190 | } else { | |
191 | sparse_base = hose->sparse_io_base; | |
192 | dense_base = hose->dense_io_base; | |
193 | } | |
194 | ||
195 | if (sparse_base) { | |
196 | suffix = "_sparse"; | |
197 | nlen1 = 17; | |
198 | if (dense_base) { | |
199 | nlen2 = 16; /* resourceN_dense */ | |
200 | res_count = 2; | |
201 | } | |
202 | } | |
203 | ||
204 | attr = kzalloc(sizeof(*attr) * res_count + nlen1 + nlen2, GFP_ATOMIC); | |
205 | if (!attr) | |
206 | return -ENOMEM; | |
207 | ||
208 | /* Create bwx, sparse or single dense file */ | |
209 | attr_name = (char *)(attr + res_count); | |
210 | pdev->res_attr[num] = attr; | |
211 | retval = pci_create_one_attr(pdev, num, attr_name, suffix, attr, | |
212 | sparse_base); | |
213 | if (retval || res_count == 1) | |
214 | return retval; | |
215 | ||
216 | /* Create dense file */ | |
217 | attr_name += nlen1; | |
218 | attr++; | |
219 | pdev->res_attr_wc[num] = attr; | |
220 | return pci_create_one_attr(pdev, num, attr_name, "_dense", attr, 0); | |
221 | } | |
222 | ||
223 | /** | |
224 | * pci_create_resource_files - create resource files in sysfs for @dev | |
225 | * @dev: dev in question | |
226 | * | |
227 | * Walk the resources in @dev creating files for each resource available. | |
228 | */ | |
229 | int pci_create_resource_files(struct pci_dev *pdev) | |
230 | { | |
231 | int i; | |
232 | int retval; | |
233 | ||
234 | /* Expose the PCI resources from this device as files */ | |
235 | for (i = 0; i < PCI_ROM_RESOURCE; i++) { | |
236 | ||
237 | /* skip empty resources */ | |
238 | if (!pci_resource_len(pdev, i)) | |
239 | continue; | |
240 | ||
241 | retval = pci_create_attr(pdev, i); | |
242 | if (retval) { | |
243 | pci_remove_resource_files(pdev); | |
244 | return retval; | |
245 | } | |
246 | } | |
247 | return 0; | |
248 | } | |
249 | ||
250 | /* Legacy I/O bus mapping stuff. */ | |
251 | ||
252 | static int __legacy_mmap_fits(struct pci_controller *hose, | |
253 | struct vm_area_struct *vma, | |
254 | unsigned long res_size, int sparse) | |
255 | { | |
256 | unsigned long nr, start, size; | |
257 | ||
258 | nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
259 | start = vma->vm_pgoff; | |
260 | size = ((res_size - 1) >> PAGE_SHIFT) + 1; | |
261 | ||
262 | if (start < size && size - start >= nr) | |
263 | return 1; | |
264 | WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on hose %d " | |
265 | "(size 0x%08lx)\n", | |
266 | current->comm, sparse ? " sparse" : "", start, start + nr, | |
267 | hose->index, size); | |
268 | return 0; | |
269 | } | |
270 | ||
271 | static inline int has_sparse(struct pci_controller *hose, | |
272 | enum pci_mmap_state mmap_type) | |
273 | { | |
274 | unsigned long base; | |
275 | ||
276 | base = (mmap_type == pci_mmap_mem) ? hose->sparse_mem_base : | |
277 | hose->sparse_io_base; | |
278 | ||
279 | return base != 0; | |
280 | } | |
281 | ||
282 | int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma, | |
283 | enum pci_mmap_state mmap_type) | |
284 | { | |
285 | struct pci_controller *hose = bus->sysdata; | |
286 | int sparse = has_sparse(hose, mmap_type); | |
287 | unsigned long res_size; | |
288 | ||
289 | res_size = (mmap_type == pci_mmap_mem) ? bus->legacy_mem->size : | |
290 | bus->legacy_io->size; | |
291 | if (!__legacy_mmap_fits(hose, vma, res_size, sparse)) | |
292 | return -EINVAL; | |
293 | ||
294 | return hose_mmap_page_range(hose, vma, mmap_type, sparse); | |
295 | } | |
296 | ||
297 | /** | |
298 | * pci_adjust_legacy_attr - adjustment of legacy file attributes | |
299 | * @b: bus to create files under | |
300 | * @mmap_type: I/O port or memory | |
301 | * | |
302 | * Adjust file name and size for sparse mappings. | |
303 | */ | |
304 | void pci_adjust_legacy_attr(struct pci_bus *bus, enum pci_mmap_state mmap_type) | |
305 | { | |
306 | struct pci_controller *hose = bus->sysdata; | |
307 | ||
308 | if (!has_sparse(hose, mmap_type)) | |
309 | return; | |
310 | ||
311 | if (mmap_type == pci_mmap_mem) { | |
312 | bus->legacy_mem->attr.name = "legacy_mem_sparse"; | |
313 | bus->legacy_mem->size <<= 5; | |
314 | } else { | |
315 | bus->legacy_io->attr.name = "legacy_io_sparse"; | |
316 | bus->legacy_io->size <<= 5; | |
317 | } | |
318 | return; | |
319 | } | |
320 | ||
321 | /* Legacy I/O bus read/write functions */ | |
322 | int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size) | |
323 | { | |
324 | struct pci_controller *hose = bus->sysdata; | |
325 | ||
326 | port += hose->io_space->start; | |
327 | ||
328 | switch(size) { | |
329 | case 1: | |
330 | *((u8 *)val) = inb(port); | |
331 | return 1; | |
332 | case 2: | |
333 | if (port & 1) | |
334 | return -EINVAL; | |
335 | *((u16 *)val) = inw(port); | |
336 | return 2; | |
337 | case 4: | |
338 | if (port & 3) | |
339 | return -EINVAL; | |
340 | *((u32 *)val) = inl(port); | |
341 | return 4; | |
342 | } | |
343 | return -EINVAL; | |
344 | } | |
345 | ||
346 | int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size) | |
347 | { | |
348 | struct pci_controller *hose = bus->sysdata; | |
349 | ||
350 | port += hose->io_space->start; | |
351 | ||
352 | switch(size) { | |
353 | case 1: | |
354 | outb(port, val); | |
355 | return 1; | |
356 | case 2: | |
357 | if (port & 1) | |
358 | return -EINVAL; | |
359 | outw(port, val); | |
360 | return 2; | |
361 | case 4: | |
362 | if (port & 3) | |
363 | return -EINVAL; | |
364 | outl(port, val); | |
365 | return 4; | |
366 | } | |
367 | return -EINVAL; | |
368 | } |