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1 | #include <linux/pci.h> |
2 | #include <linux/io.h> |
3 | #include <linux/gfp.h> |
4 | #include <linux/module.h> |
5 | |
6 | void devm_ioremap_release(struct device *dev, void *res) |
7 | { |
8 | iounmap(*(void __iomem **)res); |
9 | } |
10 | |
11 | static int devm_ioremap_match(struct device *dev, void *res, void *match_data) |
12 | { |
13 | return *(void **)res == match_data; |
14 | } |
15 | |
16 | /** |
17 | * devm_ioremap - Managed ioremap() |
18 | * @dev: Generic device to remap IO address for |
19 | * @offset: BUS offset to map |
20 | * @size: Size of map |
21 | * |
22 | * Managed ioremap(). Map is automatically unmapped on driver detach. |
23 | */ |
24 | void __iomem *devm_ioremap(struct device *dev, resource_size_t offset, |
25 | unsigned long size) |
26 | { |
27 | void __iomem **ptr, *addr; |
28 | |
29 | ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL); |
30 | if (!ptr) |
31 | return NULL; |
32 | |
33 | addr = ioremap(offset, size); |
34 | if (addr) { |
35 | *ptr = addr; |
36 | devres_add(dev, ptr); |
37 | } else |
38 | devres_free(ptr); |
39 | |
40 | return addr; |
41 | } |
42 | EXPORT_SYMBOL(devm_ioremap); |
43 | |
44 | /** |
45 | * devm_ioremap_nocache - Managed ioremap_nocache() |
46 | * @dev: Generic device to remap IO address for |
47 | * @offset: BUS offset to map |
48 | * @size: Size of map |
49 | * |
50 | * Managed ioremap_nocache(). Map is automatically unmapped on driver |
51 | * detach. |
52 | */ |
53 | void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset, |
54 | unsigned long size) |
55 | { |
56 | void __iomem **ptr, *addr; |
57 | |
58 | ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL); |
59 | if (!ptr) |
60 | return NULL; |
61 | |
62 | addr = ioremap_nocache(offset, size); |
63 | if (addr) { |
64 | *ptr = addr; |
65 | devres_add(dev, ptr); |
66 | } else |
67 | devres_free(ptr); |
68 | |
69 | return addr; |
70 | } |
71 | EXPORT_SYMBOL(devm_ioremap_nocache); |
72 | |
73 | /** |
74 | * devm_iounmap - Managed iounmap() |
75 | * @dev: Generic device to unmap for |
76 | * @addr: Address to unmap |
77 | * |
78 | * Managed iounmap(). @addr must have been mapped using devm_ioremap*(). |
79 | */ |
80 | void devm_iounmap(struct device *dev, void __iomem *addr) |
81 | { |
82 | WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match, |
83 | (void *)addr)); |
84 | iounmap(addr); |
85 | } |
86 | EXPORT_SYMBOL(devm_iounmap); |
87 | |
88 | /** |
89 | * devm_request_and_ioremap() - Check, request region, and ioremap resource |
90 | * @dev: Generic device to handle the resource for |
91 | * @res: resource to be handled |
92 | * |
93 | * Takes all necessary steps to ioremap a mem resource. Uses managed device, so |
94 | * everything is undone on driver detach. Checks arguments, so you can feed |
95 | * it the result from e.g. platform_get_resource() directly. Returns the |
96 | * remapped pointer or NULL on error. Usage example: |
97 | * |
98 | * res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
99 | * base = devm_request_and_ioremap(&pdev->dev, res); |
100 | * if (!base) |
101 | * return -EADDRNOTAVAIL; |
102 | */ |
103 | void __iomem *devm_request_and_ioremap(struct device *dev, |
104 | struct resource *res) |
105 | { |
106 | resource_size_t size; |
107 | const char *name; |
108 | void __iomem *dest_ptr; |
109 | |
110 | BUG_ON(!dev); |
111 | |
112 | if (!res || resource_type(res) != IORESOURCE_MEM) { |
113 | dev_err(dev, "invalid resource\n"); |
114 | return NULL; |
115 | } |
116 | |
117 | size = resource_size(res); |
118 | name = res->name ?: dev_name(dev); |
119 | |
120 | if (!devm_request_mem_region(dev, res->start, size, name)) { |
121 | dev_err(dev, "can't request region for resource %pR\n", res); |
122 | return NULL; |
123 | } |
124 | |
125 | if (res->flags & IORESOURCE_CACHEABLE) |
126 | dest_ptr = devm_ioremap(dev, res->start, size); |
127 | else |
128 | dest_ptr = devm_ioremap_nocache(dev, res->start, size); |
129 | |
130 | if (!dest_ptr) { |
131 | dev_err(dev, "ioremap failed for resource %pR\n", res); |
132 | devm_release_mem_region(dev, res->start, size); |
133 | } |
134 | |
135 | return dest_ptr; |
136 | } |
137 | EXPORT_SYMBOL(devm_request_and_ioremap); |
138 | |
139 | #ifdef CONFIG_HAS_IOPORT |
140 | /* |
141 | * Generic iomap devres |
142 | */ |
143 | static void devm_ioport_map_release(struct device *dev, void *res) |
144 | { |
145 | ioport_unmap(*(void __iomem **)res); |
146 | } |
147 | |
148 | static int devm_ioport_map_match(struct device *dev, void *res, |
149 | void *match_data) |
150 | { |
151 | return *(void **)res == match_data; |
152 | } |
153 | |
154 | /** |
155 | * devm_ioport_map - Managed ioport_map() |
156 | * @dev: Generic device to map ioport for |
157 | * @port: Port to map |
158 | * @nr: Number of ports to map |
159 | * |
160 | * Managed ioport_map(). Map is automatically unmapped on driver |
161 | * detach. |
162 | */ |
163 | void __iomem * devm_ioport_map(struct device *dev, unsigned long port, |
164 | unsigned int nr) |
165 | { |
166 | void __iomem **ptr, *addr; |
167 | |
168 | ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL); |
169 | if (!ptr) |
170 | return NULL; |
171 | |
172 | addr = ioport_map(port, nr); |
173 | if (addr) { |
174 | *ptr = addr; |
175 | devres_add(dev, ptr); |
176 | } else |
177 | devres_free(ptr); |
178 | |
179 | return addr; |
180 | } |
181 | EXPORT_SYMBOL(devm_ioport_map); |
182 | |
183 | /** |
184 | * devm_ioport_unmap - Managed ioport_unmap() |
185 | * @dev: Generic device to unmap for |
186 | * @addr: Address to unmap |
187 | * |
188 | * Managed ioport_unmap(). @addr must have been mapped using |
189 | * devm_ioport_map(). |
190 | */ |
191 | void devm_ioport_unmap(struct device *dev, void __iomem *addr) |
192 | { |
193 | ioport_unmap(addr); |
194 | WARN_ON(devres_destroy(dev, devm_ioport_map_release, |
195 | devm_ioport_map_match, (void *)addr)); |
196 | } |
197 | EXPORT_SYMBOL(devm_ioport_unmap); |
198 | |
199 | #ifdef CONFIG_PCI |
200 | /* |
201 | * PCI iomap devres |
202 | */ |
203 | #define PCIM_IOMAP_MAX PCI_ROM_RESOURCE |
204 | |
205 | struct pcim_iomap_devres { |
206 | void __iomem *table[PCIM_IOMAP_MAX]; |
207 | }; |
208 | |
209 | static void pcim_iomap_release(struct device *gendev, void *res) |
210 | { |
211 | struct pci_dev *dev = container_of(gendev, struct pci_dev, dev); |
212 | struct pcim_iomap_devres *this = res; |
213 | int i; |
214 | |
215 | for (i = 0; i < PCIM_IOMAP_MAX; i++) |
216 | if (this->table[i]) |
217 | pci_iounmap(dev, this->table[i]); |
218 | } |
219 | |
220 | /** |
221 | * pcim_iomap_table - access iomap allocation table |
222 | * @pdev: PCI device to access iomap table for |
223 | * |
224 | * Access iomap allocation table for @dev. If iomap table doesn't |
225 | * exist and @pdev is managed, it will be allocated. All iomaps |
226 | * recorded in the iomap table are automatically unmapped on driver |
227 | * detach. |
228 | * |
229 | * This function might sleep when the table is first allocated but can |
230 | * be safely called without context and guaranteed to succed once |
231 | * allocated. |
232 | */ |
233 | void __iomem * const * pcim_iomap_table(struct pci_dev *pdev) |
234 | { |
235 | struct pcim_iomap_devres *dr, *new_dr; |
236 | |
237 | dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL); |
238 | if (dr) |
239 | return dr->table; |
240 | |
241 | new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL); |
242 | if (!new_dr) |
243 | return NULL; |
244 | dr = devres_get(&pdev->dev, new_dr, NULL, NULL); |
245 | return dr->table; |
246 | } |
247 | EXPORT_SYMBOL(pcim_iomap_table); |
248 | |
249 | /** |
250 | * pcim_iomap - Managed pcim_iomap() |
251 | * @pdev: PCI device to iomap for |
252 | * @bar: BAR to iomap |
253 | * @maxlen: Maximum length of iomap |
254 | * |
255 | * Managed pci_iomap(). Map is automatically unmapped on driver |
256 | * detach. |
257 | */ |
258 | void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen) |
259 | { |
260 | void __iomem **tbl; |
261 | |
262 | BUG_ON(bar >= PCIM_IOMAP_MAX); |
263 | |
264 | tbl = (void __iomem **)pcim_iomap_table(pdev); |
265 | if (!tbl || tbl[bar]) /* duplicate mappings not allowed */ |
266 | return NULL; |
267 | |
268 | tbl[bar] = pci_iomap(pdev, bar, maxlen); |
269 | return tbl[bar]; |
270 | } |
271 | EXPORT_SYMBOL(pcim_iomap); |
272 | |
273 | /** |
274 | * pcim_iounmap - Managed pci_iounmap() |
275 | * @pdev: PCI device to iounmap for |
276 | * @addr: Address to unmap |
277 | * |
278 | * Managed pci_iounmap(). @addr must have been mapped using pcim_iomap(). |
279 | */ |
280 | void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr) |
281 | { |
282 | void __iomem **tbl; |
283 | int i; |
284 | |
285 | pci_iounmap(pdev, addr); |
286 | |
287 | tbl = (void __iomem **)pcim_iomap_table(pdev); |
288 | BUG_ON(!tbl); |
289 | |
290 | for (i = 0; i < PCIM_IOMAP_MAX; i++) |
291 | if (tbl[i] == addr) { |
292 | tbl[i] = NULL; |
293 | return; |
294 | } |
295 | WARN_ON(1); |
296 | } |
297 | EXPORT_SYMBOL(pcim_iounmap); |
298 | |
299 | /** |
300 | * pcim_iomap_regions - Request and iomap PCI BARs |
301 | * @pdev: PCI device to map IO resources for |
302 | * @mask: Mask of BARs to request and iomap |
303 | * @name: Name used when requesting regions |
304 | * |
305 | * Request and iomap regions specified by @mask. |
306 | */ |
307 | int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name) |
308 | { |
309 | void __iomem * const *iomap; |
310 | int i, rc; |
311 | |
312 | iomap = pcim_iomap_table(pdev); |
313 | if (!iomap) |
314 | return -ENOMEM; |
315 | |
316 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { |
317 | unsigned long len; |
318 | |
319 | if (!(mask & (1 << i))) |
320 | continue; |
321 | |
322 | rc = -EINVAL; |
323 | len = pci_resource_len(pdev, i); |
324 | if (!len) |
325 | goto err_inval; |
326 | |
327 | rc = pci_request_region(pdev, i, name); |
328 | if (rc) |
329 | goto err_inval; |
330 | |
331 | rc = -ENOMEM; |
332 | if (!pcim_iomap(pdev, i, 0)) |
333 | goto err_region; |
334 | } |
335 | |
336 | return 0; |
337 | |
338 | err_region: |
339 | pci_release_region(pdev, i); |
340 | err_inval: |
341 | while (--i >= 0) { |
342 | if (!(mask & (1 << i))) |
343 | continue; |
344 | pcim_iounmap(pdev, iomap[i]); |
345 | pci_release_region(pdev, i); |
346 | } |
347 | |
348 | return rc; |
349 | } |
350 | EXPORT_SYMBOL(pcim_iomap_regions); |
351 | |
352 | /** |
353 | * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones |
354 | * @pdev: PCI device to map IO resources for |
355 | * @mask: Mask of BARs to iomap |
356 | * @name: Name used when requesting regions |
357 | * |
358 | * Request all PCI BARs and iomap regions specified by @mask. |
359 | */ |
360 | int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask, |
361 | const char *name) |
362 | { |
363 | int request_mask = ((1 << 6) - 1) & ~mask; |
364 | int rc; |
365 | |
366 | rc = pci_request_selected_regions(pdev, request_mask, name); |
367 | if (rc) |
368 | return rc; |
369 | |
370 | rc = pcim_iomap_regions(pdev, mask, name); |
371 | if (rc) |
372 | pci_release_selected_regions(pdev, request_mask); |
373 | return rc; |
374 | } |
375 | EXPORT_SYMBOL(pcim_iomap_regions_request_all); |
376 | |
377 | /** |
378 | * pcim_iounmap_regions - Unmap and release PCI BARs |
379 | * @pdev: PCI device to map IO resources for |
380 | * @mask: Mask of BARs to unmap and release |
381 | * |
382 | * Unmap and release regions specified by @mask. |
383 | */ |
384 | void pcim_iounmap_regions(struct pci_dev *pdev, int mask) |
385 | { |
386 | void __iomem * const *iomap; |
387 | int i; |
388 | |
389 | iomap = pcim_iomap_table(pdev); |
390 | if (!iomap) |
391 | return; |
392 | |
393 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { |
394 | if (!(mask & (1 << i))) |
395 | continue; |
396 | |
397 | pcim_iounmap(pdev, iomap[i]); |
398 | pci_release_region(pdev, i); |
399 | } |
400 | } |
401 | EXPORT_SYMBOL(pcim_iounmap_regions); |
402 | #endif /* CONFIG_PCI */ |
403 | #endif /* CONFIG_HAS_IOPORT */ |
404 |
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