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1 | #include <linux/err.h> |
2 | #include <linux/pci.h> |
3 | #include <linux/io.h> |
4 | #include <linux/gfp.h> |
5 | #include <linux/export.h> |
6 | |
7 | void devm_ioremap_release(struct device *dev, void *res) |
8 | { |
9 | iounmap(*(void __iomem **)res); |
10 | } |
11 | |
12 | static int devm_ioremap_match(struct device *dev, void *res, void *match_data) |
13 | { |
14 | return *(void **)res == match_data; |
15 | } |
16 | |
17 | /** |
18 | * devm_ioremap - Managed ioremap() |
19 | * @dev: Generic device to remap IO address for |
20 | * @offset: BUS offset to map |
21 | * @size: Size of map |
22 | * |
23 | * Managed ioremap(). Map is automatically unmapped on driver detach. |
24 | */ |
25 | void __iomem *devm_ioremap(struct device *dev, resource_size_t offset, |
26 | unsigned long size) |
27 | { |
28 | void __iomem **ptr, *addr; |
29 | |
30 | ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL); |
31 | if (!ptr) |
32 | return NULL; |
33 | |
34 | addr = ioremap(offset, size); |
35 | if (addr) { |
36 | *ptr = addr; |
37 | devres_add(dev, ptr); |
38 | } else |
39 | devres_free(ptr); |
40 | |
41 | return addr; |
42 | } |
43 | EXPORT_SYMBOL(devm_ioremap); |
44 | |
45 | /** |
46 | * devm_ioremap_nocache - Managed ioremap_nocache() |
47 | * @dev: Generic device to remap IO address for |
48 | * @offset: BUS offset to map |
49 | * @size: Size of map |
50 | * |
51 | * Managed ioremap_nocache(). Map is automatically unmapped on driver |
52 | * detach. |
53 | */ |
54 | void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset, |
55 | unsigned long size) |
56 | { |
57 | void __iomem **ptr, *addr; |
58 | |
59 | ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL); |
60 | if (!ptr) |
61 | return NULL; |
62 | |
63 | addr = ioremap_nocache(offset, size); |
64 | if (addr) { |
65 | *ptr = addr; |
66 | devres_add(dev, ptr); |
67 | } else |
68 | devres_free(ptr); |
69 | |
70 | return addr; |
71 | } |
72 | EXPORT_SYMBOL(devm_ioremap_nocache); |
73 | |
74 | /** |
75 | * devm_iounmap - Managed iounmap() |
76 | * @dev: Generic device to unmap for |
77 | * @addr: Address to unmap |
78 | * |
79 | * Managed iounmap(). @addr must have been mapped using devm_ioremap*(). |
80 | */ |
81 | void devm_iounmap(struct device *dev, void __iomem *addr) |
82 | { |
83 | WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match, |
84 | (void *)addr)); |
85 | iounmap(addr); |
86 | } |
87 | EXPORT_SYMBOL(devm_iounmap); |
88 | |
89 | /** |
90 | * devm_ioremap_resource() - check, request region, and ioremap resource |
91 | * @dev: generic device to handle the resource for |
92 | * @res: resource to be handled |
93 | * |
94 | * Checks that a resource is a valid memory region, requests the memory region |
95 | * and ioremaps it either as cacheable or as non-cacheable memory depending on |
96 | * the resource's flags. All operations are managed and will be undone on |
97 | * driver detach. |
98 | * |
99 | * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code |
100 | * on failure. Usage example: |
101 | * |
102 | * res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
103 | * base = devm_ioremap_resource(&pdev->dev, res); |
104 | * if (IS_ERR(base)) |
105 | * return PTR_ERR(base); |
106 | */ |
107 | void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res) |
108 | { |
109 | resource_size_t size; |
110 | const char *name; |
111 | void __iomem *dest_ptr; |
112 | |
113 | BUG_ON(!dev); |
114 | |
115 | if (!res || resource_type(res) != IORESOURCE_MEM) { |
116 | dev_err(dev, "invalid resource\n"); |
117 | return ERR_PTR(-EINVAL); |
118 | } |
119 | |
120 | size = resource_size(res); |
121 | name = res->name ?: dev_name(dev); |
122 | |
123 | if (!devm_request_mem_region(dev, res->start, size, name)) { |
124 | dev_err(dev, "can't request region for resource %pR\n", res); |
125 | return ERR_PTR(-EBUSY); |
126 | } |
127 | |
128 | if (res->flags & IORESOURCE_CACHEABLE) |
129 | dest_ptr = devm_ioremap(dev, res->start, size); |
130 | else |
131 | dest_ptr = devm_ioremap_nocache(dev, res->start, size); |
132 | |
133 | if (!dest_ptr) { |
134 | dev_err(dev, "ioremap failed for resource %pR\n", res); |
135 | devm_release_mem_region(dev, res->start, size); |
136 | dest_ptr = ERR_PTR(-ENOMEM); |
137 | } |
138 | |
139 | return dest_ptr; |
140 | } |
141 | EXPORT_SYMBOL(devm_ioremap_resource); |
142 | |
143 | /** |
144 | * devm_request_and_ioremap() - Check, request region, and ioremap resource |
145 | * @dev: Generic device to handle the resource for |
146 | * @res: resource to be handled |
147 | * |
148 | * Takes all necessary steps to ioremap a mem resource. Uses managed device, so |
149 | * everything is undone on driver detach. Checks arguments, so you can feed |
150 | * it the result from e.g. platform_get_resource() directly. Returns the |
151 | * remapped pointer or NULL on error. Usage example: |
152 | * |
153 | * res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
154 | * base = devm_request_and_ioremap(&pdev->dev, res); |
155 | * if (!base) |
156 | * return -EADDRNOTAVAIL; |
157 | */ |
158 | void __iomem *devm_request_and_ioremap(struct device *device, |
159 | struct resource *res) |
160 | { |
161 | void __iomem *dest_ptr; |
162 | |
163 | dest_ptr = devm_ioremap_resource(device, res); |
164 | if (IS_ERR(dest_ptr)) |
165 | return NULL; |
166 | |
167 | return dest_ptr; |
168 | } |
169 | EXPORT_SYMBOL(devm_request_and_ioremap); |
170 | |
171 | #ifdef CONFIG_HAS_IOPORT |
172 | /* |
173 | * Generic iomap devres |
174 | */ |
175 | static void devm_ioport_map_release(struct device *dev, void *res) |
176 | { |
177 | ioport_unmap(*(void __iomem **)res); |
178 | } |
179 | |
180 | static int devm_ioport_map_match(struct device *dev, void *res, |
181 | void *match_data) |
182 | { |
183 | return *(void **)res == match_data; |
184 | } |
185 | |
186 | /** |
187 | * devm_ioport_map - Managed ioport_map() |
188 | * @dev: Generic device to map ioport for |
189 | * @port: Port to map |
190 | * @nr: Number of ports to map |
191 | * |
192 | * Managed ioport_map(). Map is automatically unmapped on driver |
193 | * detach. |
194 | */ |
195 | void __iomem * devm_ioport_map(struct device *dev, unsigned long port, |
196 | unsigned int nr) |
197 | { |
198 | void __iomem **ptr, *addr; |
199 | |
200 | ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL); |
201 | if (!ptr) |
202 | return NULL; |
203 | |
204 | addr = ioport_map(port, nr); |
205 | if (addr) { |
206 | *ptr = addr; |
207 | devres_add(dev, ptr); |
208 | } else |
209 | devres_free(ptr); |
210 | |
211 | return addr; |
212 | } |
213 | EXPORT_SYMBOL(devm_ioport_map); |
214 | |
215 | /** |
216 | * devm_ioport_unmap - Managed ioport_unmap() |
217 | * @dev: Generic device to unmap for |
218 | * @addr: Address to unmap |
219 | * |
220 | * Managed ioport_unmap(). @addr must have been mapped using |
221 | * devm_ioport_map(). |
222 | */ |
223 | void devm_ioport_unmap(struct device *dev, void __iomem *addr) |
224 | { |
225 | ioport_unmap(addr); |
226 | WARN_ON(devres_destroy(dev, devm_ioport_map_release, |
227 | devm_ioport_map_match, (void *)addr)); |
228 | } |
229 | EXPORT_SYMBOL(devm_ioport_unmap); |
230 | #endif /* CONFIG_HAS_IOPORT */ |
231 | |
232 | #ifdef CONFIG_PCI |
233 | /* |
234 | * PCI iomap devres |
235 | */ |
236 | #define PCIM_IOMAP_MAX PCI_ROM_RESOURCE |
237 | |
238 | struct pcim_iomap_devres { |
239 | void __iomem *table[PCIM_IOMAP_MAX]; |
240 | }; |
241 | |
242 | static void pcim_iomap_release(struct device *gendev, void *res) |
243 | { |
244 | struct pci_dev *dev = container_of(gendev, struct pci_dev, dev); |
245 | struct pcim_iomap_devres *this = res; |
246 | int i; |
247 | |
248 | for (i = 0; i < PCIM_IOMAP_MAX; i++) |
249 | if (this->table[i]) |
250 | pci_iounmap(dev, this->table[i]); |
251 | } |
252 | |
253 | /** |
254 | * pcim_iomap_table - access iomap allocation table |
255 | * @pdev: PCI device to access iomap table for |
256 | * |
257 | * Access iomap allocation table for @dev. If iomap table doesn't |
258 | * exist and @pdev is managed, it will be allocated. All iomaps |
259 | * recorded in the iomap table are automatically unmapped on driver |
260 | * detach. |
261 | * |
262 | * This function might sleep when the table is first allocated but can |
263 | * be safely called without context and guaranteed to succed once |
264 | * allocated. |
265 | */ |
266 | void __iomem * const * pcim_iomap_table(struct pci_dev *pdev) |
267 | { |
268 | struct pcim_iomap_devres *dr, *new_dr; |
269 | |
270 | dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL); |
271 | if (dr) |
272 | return dr->table; |
273 | |
274 | new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL); |
275 | if (!new_dr) |
276 | return NULL; |
277 | dr = devres_get(&pdev->dev, new_dr, NULL, NULL); |
278 | return dr->table; |
279 | } |
280 | EXPORT_SYMBOL(pcim_iomap_table); |
281 | |
282 | /** |
283 | * pcim_iomap - Managed pcim_iomap() |
284 | * @pdev: PCI device to iomap for |
285 | * @bar: BAR to iomap |
286 | * @maxlen: Maximum length of iomap |
287 | * |
288 | * Managed pci_iomap(). Map is automatically unmapped on driver |
289 | * detach. |
290 | */ |
291 | void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen) |
292 | { |
293 | void __iomem **tbl; |
294 | |
295 | BUG_ON(bar >= PCIM_IOMAP_MAX); |
296 | |
297 | tbl = (void __iomem **)pcim_iomap_table(pdev); |
298 | if (!tbl || tbl[bar]) /* duplicate mappings not allowed */ |
299 | return NULL; |
300 | |
301 | tbl[bar] = pci_iomap(pdev, bar, maxlen); |
302 | return tbl[bar]; |
303 | } |
304 | EXPORT_SYMBOL(pcim_iomap); |
305 | |
306 | /** |
307 | * pcim_iounmap - Managed pci_iounmap() |
308 | * @pdev: PCI device to iounmap for |
309 | * @addr: Address to unmap |
310 | * |
311 | * Managed pci_iounmap(). @addr must have been mapped using pcim_iomap(). |
312 | */ |
313 | void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr) |
314 | { |
315 | void __iomem **tbl; |
316 | int i; |
317 | |
318 | pci_iounmap(pdev, addr); |
319 | |
320 | tbl = (void __iomem **)pcim_iomap_table(pdev); |
321 | BUG_ON(!tbl); |
322 | |
323 | for (i = 0; i < PCIM_IOMAP_MAX; i++) |
324 | if (tbl[i] == addr) { |
325 | tbl[i] = NULL; |
326 | return; |
327 | } |
328 | WARN_ON(1); |
329 | } |
330 | EXPORT_SYMBOL(pcim_iounmap); |
331 | |
332 | /** |
333 | * pcim_iomap_regions - Request and iomap PCI BARs |
334 | * @pdev: PCI device to map IO resources for |
335 | * @mask: Mask of BARs to request and iomap |
336 | * @name: Name used when requesting regions |
337 | * |
338 | * Request and iomap regions specified by @mask. |
339 | */ |
340 | int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name) |
341 | { |
342 | void __iomem * const *iomap; |
343 | int i, rc; |
344 | |
345 | iomap = pcim_iomap_table(pdev); |
346 | if (!iomap) |
347 | return -ENOMEM; |
348 | |
349 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { |
350 | unsigned long len; |
351 | |
352 | if (!(mask & (1 << i))) |
353 | continue; |
354 | |
355 | rc = -EINVAL; |
356 | len = pci_resource_len(pdev, i); |
357 | if (!len) |
358 | goto err_inval; |
359 | |
360 | rc = pci_request_region(pdev, i, name); |
361 | if (rc) |
362 | goto err_inval; |
363 | |
364 | rc = -ENOMEM; |
365 | if (!pcim_iomap(pdev, i, 0)) |
366 | goto err_region; |
367 | } |
368 | |
369 | return 0; |
370 | |
371 | err_region: |
372 | pci_release_region(pdev, i); |
373 | err_inval: |
374 | while (--i >= 0) { |
375 | if (!(mask & (1 << i))) |
376 | continue; |
377 | pcim_iounmap(pdev, iomap[i]); |
378 | pci_release_region(pdev, i); |
379 | } |
380 | |
381 | return rc; |
382 | } |
383 | EXPORT_SYMBOL(pcim_iomap_regions); |
384 | |
385 | /** |
386 | * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones |
387 | * @pdev: PCI device to map IO resources for |
388 | * @mask: Mask of BARs to iomap |
389 | * @name: Name used when requesting regions |
390 | * |
391 | * Request all PCI BARs and iomap regions specified by @mask. |
392 | */ |
393 | int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask, |
394 | const char *name) |
395 | { |
396 | int request_mask = ((1 << 6) - 1) & ~mask; |
397 | int rc; |
398 | |
399 | rc = pci_request_selected_regions(pdev, request_mask, name); |
400 | if (rc) |
401 | return rc; |
402 | |
403 | rc = pcim_iomap_regions(pdev, mask, name); |
404 | if (rc) |
405 | pci_release_selected_regions(pdev, request_mask); |
406 | return rc; |
407 | } |
408 | EXPORT_SYMBOL(pcim_iomap_regions_request_all); |
409 | |
410 | /** |
411 | * pcim_iounmap_regions - Unmap and release PCI BARs |
412 | * @pdev: PCI device to map IO resources for |
413 | * @mask: Mask of BARs to unmap and release |
414 | * |
415 | * Unmap and release regions specified by @mask. |
416 | */ |
417 | void pcim_iounmap_regions(struct pci_dev *pdev, int mask) |
418 | { |
419 | void __iomem * const *iomap; |
420 | int i; |
421 | |
422 | iomap = pcim_iomap_table(pdev); |
423 | if (!iomap) |
424 | return; |
425 | |
426 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { |
427 | if (!(mask & (1 << i))) |
428 | continue; |
429 | |
430 | pcim_iounmap(pdev, iomap[i]); |
431 | pci_release_region(pdev, i); |
432 | } |
433 | } |
434 | EXPORT_SYMBOL(pcim_iounmap_regions); |
435 | #endif /* CONFIG_PCI */ |
436 |
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