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1 | // SPDX-License-Identifier: GPL-2.0 | |
2 | #include <linux/err.h> | |
3 | #include <linux/pci.h> | |
4 | #include <linux/io.h> | |
5 | #include <linux/gfp.h> | |
6 | #include <linux/export.h> | |
7 | #include <linux/of_address.h> | |
8 | ||
9 | enum devm_ioremap_type { | |
10 | DEVM_IOREMAP = 0, | |
11 | DEVM_IOREMAP_UC, | |
12 | DEVM_IOREMAP_WC, | |
13 | }; | |
14 | ||
15 | void devm_ioremap_release(struct device *dev, void *res) | |
16 | { | |
17 | iounmap(*(void __iomem **)res); | |
18 | } | |
19 | ||
20 | static int devm_ioremap_match(struct device *dev, void *res, void *match_data) | |
21 | { | |
22 | return *(void **)res == match_data; | |
23 | } | |
24 | ||
25 | static void __iomem *__devm_ioremap(struct device *dev, resource_size_t offset, | |
26 | resource_size_t size, | |
27 | enum devm_ioremap_type type) | |
28 | { | |
29 | void __iomem **ptr, *addr = NULL; | |
30 | ||
31 | ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL); | |
32 | if (!ptr) | |
33 | return NULL; | |
34 | ||
35 | switch (type) { | |
36 | case DEVM_IOREMAP: | |
37 | addr = ioremap(offset, size); | |
38 | break; | |
39 | case DEVM_IOREMAP_UC: | |
40 | addr = ioremap_uc(offset, size); | |
41 | break; | |
42 | case DEVM_IOREMAP_WC: | |
43 | addr = ioremap_wc(offset, size); | |
44 | break; | |
45 | } | |
46 | ||
47 | if (addr) { | |
48 | *ptr = addr; | |
49 | devres_add(dev, ptr); | |
50 | } else | |
51 | devres_free(ptr); | |
52 | ||
53 | return addr; | |
54 | } | |
55 | ||
56 | /** | |
57 | * devm_ioremap - Managed ioremap() | |
58 | * @dev: Generic device to remap IO address for | |
59 | * @offset: Resource address to map | |
60 | * @size: Size of map | |
61 | * | |
62 | * Managed ioremap(). Map is automatically unmapped on driver detach. | |
63 | */ | |
64 | void __iomem *devm_ioremap(struct device *dev, resource_size_t offset, | |
65 | resource_size_t size) | |
66 | { | |
67 | return __devm_ioremap(dev, offset, size, DEVM_IOREMAP); | |
68 | } | |
69 | EXPORT_SYMBOL(devm_ioremap); | |
70 | ||
71 | /** | |
72 | * devm_ioremap_uc - Managed ioremap_uc() | |
73 | * @dev: Generic device to remap IO address for | |
74 | * @offset: Resource address to map | |
75 | * @size: Size of map | |
76 | * | |
77 | * Managed ioremap_uc(). Map is automatically unmapped on driver detach. | |
78 | */ | |
79 | void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset, | |
80 | resource_size_t size) | |
81 | { | |
82 | return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_UC); | |
83 | } | |
84 | EXPORT_SYMBOL_GPL(devm_ioremap_uc); | |
85 | ||
86 | /** | |
87 | * devm_ioremap_wc - Managed ioremap_wc() | |
88 | * @dev: Generic device to remap IO address for | |
89 | * @offset: Resource address to map | |
90 | * @size: Size of map | |
91 | * | |
92 | * Managed ioremap_wc(). Map is automatically unmapped on driver detach. | |
93 | */ | |
94 | void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset, | |
95 | resource_size_t size) | |
96 | { | |
97 | return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_WC); | |
98 | } | |
99 | EXPORT_SYMBOL(devm_ioremap_wc); | |
100 | ||
101 | /** | |
102 | * devm_iounmap - Managed iounmap() | |
103 | * @dev: Generic device to unmap for | |
104 | * @addr: Address to unmap | |
105 | * | |
106 | * Managed iounmap(). @addr must have been mapped using devm_ioremap*(). | |
107 | */ | |
108 | void devm_iounmap(struct device *dev, void __iomem *addr) | |
109 | { | |
110 | WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match, | |
111 | (__force void *)addr)); | |
112 | iounmap(addr); | |
113 | } | |
114 | EXPORT_SYMBOL(devm_iounmap); | |
115 | ||
116 | static void __iomem * | |
117 | __devm_ioremap_resource(struct device *dev, const struct resource *res, | |
118 | enum devm_ioremap_type type) | |
119 | { | |
120 | resource_size_t size; | |
121 | void __iomem *dest_ptr; | |
122 | ||
123 | BUG_ON(!dev); | |
124 | ||
125 | if (!res || resource_type(res) != IORESOURCE_MEM) { | |
126 | dev_err(dev, "invalid resource\n"); | |
127 | return IOMEM_ERR_PTR(-EINVAL); | |
128 | } | |
129 | ||
130 | size = resource_size(res); | |
131 | ||
132 | if (!devm_request_mem_region(dev, res->start, size, dev_name(dev))) { | |
133 | dev_err(dev, "can't request region for resource %pR\n", res); | |
134 | return IOMEM_ERR_PTR(-EBUSY); | |
135 | } | |
136 | ||
137 | dest_ptr = __devm_ioremap(dev, res->start, size, type); | |
138 | if (!dest_ptr) { | |
139 | dev_err(dev, "ioremap failed for resource %pR\n", res); | |
140 | devm_release_mem_region(dev, res->start, size); | |
141 | dest_ptr = IOMEM_ERR_PTR(-ENOMEM); | |
142 | } | |
143 | ||
144 | return dest_ptr; | |
145 | } | |
146 | ||
147 | /** | |
148 | * devm_ioremap_resource() - check, request region, and ioremap resource | |
149 | * @dev: generic device to handle the resource for | |
150 | * @res: resource to be handled | |
151 | * | |
152 | * Checks that a resource is a valid memory region, requests the memory | |
153 | * region and ioremaps it. All operations are managed and will be undone | |
154 | * on driver detach. | |
155 | * | |
156 | * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code | |
157 | * on failure. Usage example: | |
158 | * | |
159 | * res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
160 | * base = devm_ioremap_resource(&pdev->dev, res); | |
161 | * if (IS_ERR(base)) | |
162 | * return PTR_ERR(base); | |
163 | */ | |
164 | void __iomem *devm_ioremap_resource(struct device *dev, | |
165 | const struct resource *res) | |
166 | { | |
167 | return __devm_ioremap_resource(dev, res, DEVM_IOREMAP); | |
168 | } | |
169 | EXPORT_SYMBOL(devm_ioremap_resource); | |
170 | ||
171 | /** | |
172 | * devm_ioremap_resource_wc() - write-combined variant of | |
173 | * devm_ioremap_resource() | |
174 | * @dev: generic device to handle the resource for | |
175 | * @res: resource to be handled | |
176 | * | |
177 | * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code | |
178 | * on failure. Usage example: | |
179 | */ | |
180 | void __iomem *devm_ioremap_resource_wc(struct device *dev, | |
181 | const struct resource *res) | |
182 | { | |
183 | return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_WC); | |
184 | } | |
185 | ||
186 | /* | |
187 | * devm_of_iomap - Requests a resource and maps the memory mapped IO | |
188 | * for a given device_node managed by a given device | |
189 | * | |
190 | * Checks that a resource is a valid memory region, requests the memory | |
191 | * region and ioremaps it. All operations are managed and will be undone | |
192 | * on driver detach of the device. | |
193 | * | |
194 | * This is to be used when a device requests/maps resources described | |
195 | * by other device tree nodes (children or otherwise). | |
196 | * | |
197 | * @dev: The device "managing" the resource | |
198 | * @node: The device-tree node where the resource resides | |
199 | * @index: index of the MMIO range in the "reg" property | |
200 | * @size: Returns the size of the resource (pass NULL if not needed) | |
201 | * Returns a pointer to the requested and mapped memory or an ERR_PTR() encoded | |
202 | * error code on failure. Usage example: | |
203 | * | |
204 | * base = devm_of_iomap(&pdev->dev, node, 0, NULL); | |
205 | * if (IS_ERR(base)) | |
206 | * return PTR_ERR(base); | |
207 | */ | |
208 | void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index, | |
209 | resource_size_t *size) | |
210 | { | |
211 | struct resource res; | |
212 | ||
213 | if (of_address_to_resource(node, index, &res)) | |
214 | return IOMEM_ERR_PTR(-EINVAL); | |
215 | if (size) | |
216 | *size = resource_size(&res); | |
217 | return devm_ioremap_resource(dev, &res); | |
218 | } | |
219 | EXPORT_SYMBOL(devm_of_iomap); | |
220 | ||
221 | #ifdef CONFIG_HAS_IOPORT_MAP | |
222 | /* | |
223 | * Generic iomap devres | |
224 | */ | |
225 | static void devm_ioport_map_release(struct device *dev, void *res) | |
226 | { | |
227 | ioport_unmap(*(void __iomem **)res); | |
228 | } | |
229 | ||
230 | static int devm_ioport_map_match(struct device *dev, void *res, | |
231 | void *match_data) | |
232 | { | |
233 | return *(void **)res == match_data; | |
234 | } | |
235 | ||
236 | /** | |
237 | * devm_ioport_map - Managed ioport_map() | |
238 | * @dev: Generic device to map ioport for | |
239 | * @port: Port to map | |
240 | * @nr: Number of ports to map | |
241 | * | |
242 | * Managed ioport_map(). Map is automatically unmapped on driver | |
243 | * detach. | |
244 | */ | |
245 | void __iomem *devm_ioport_map(struct device *dev, unsigned long port, | |
246 | unsigned int nr) | |
247 | { | |
248 | void __iomem **ptr, *addr; | |
249 | ||
250 | ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL); | |
251 | if (!ptr) | |
252 | return NULL; | |
253 | ||
254 | addr = ioport_map(port, nr); | |
255 | if (addr) { | |
256 | *ptr = addr; | |
257 | devres_add(dev, ptr); | |
258 | } else | |
259 | devres_free(ptr); | |
260 | ||
261 | return addr; | |
262 | } | |
263 | EXPORT_SYMBOL(devm_ioport_map); | |
264 | ||
265 | /** | |
266 | * devm_ioport_unmap - Managed ioport_unmap() | |
267 | * @dev: Generic device to unmap for | |
268 | * @addr: Address to unmap | |
269 | * | |
270 | * Managed ioport_unmap(). @addr must have been mapped using | |
271 | * devm_ioport_map(). | |
272 | */ | |
273 | void devm_ioport_unmap(struct device *dev, void __iomem *addr) | |
274 | { | |
275 | ioport_unmap(addr); | |
276 | WARN_ON(devres_destroy(dev, devm_ioport_map_release, | |
277 | devm_ioport_map_match, (__force void *)addr)); | |
278 | } | |
279 | EXPORT_SYMBOL(devm_ioport_unmap); | |
280 | #endif /* CONFIG_HAS_IOPORT_MAP */ | |
281 | ||
282 | #ifdef CONFIG_PCI | |
283 | /* | |
284 | * PCI iomap devres | |
285 | */ | |
286 | #define PCIM_IOMAP_MAX PCI_STD_NUM_BARS | |
287 | ||
288 | struct pcim_iomap_devres { | |
289 | void __iomem *table[PCIM_IOMAP_MAX]; | |
290 | }; | |
291 | ||
292 | static void pcim_iomap_release(struct device *gendev, void *res) | |
293 | { | |
294 | struct pci_dev *dev = to_pci_dev(gendev); | |
295 | struct pcim_iomap_devres *this = res; | |
296 | int i; | |
297 | ||
298 | for (i = 0; i < PCIM_IOMAP_MAX; i++) | |
299 | if (this->table[i]) | |
300 | pci_iounmap(dev, this->table[i]); | |
301 | } | |
302 | ||
303 | /** | |
304 | * pcim_iomap_table - access iomap allocation table | |
305 | * @pdev: PCI device to access iomap table for | |
306 | * | |
307 | * Access iomap allocation table for @dev. If iomap table doesn't | |
308 | * exist and @pdev is managed, it will be allocated. All iomaps | |
309 | * recorded in the iomap table are automatically unmapped on driver | |
310 | * detach. | |
311 | * | |
312 | * This function might sleep when the table is first allocated but can | |
313 | * be safely called without context and guaranteed to succed once | |
314 | * allocated. | |
315 | */ | |
316 | void __iomem * const *pcim_iomap_table(struct pci_dev *pdev) | |
317 | { | |
318 | struct pcim_iomap_devres *dr, *new_dr; | |
319 | ||
320 | dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL); | |
321 | if (dr) | |
322 | return dr->table; | |
323 | ||
324 | new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL); | |
325 | if (!new_dr) | |
326 | return NULL; | |
327 | dr = devres_get(&pdev->dev, new_dr, NULL, NULL); | |
328 | return dr->table; | |
329 | } | |
330 | EXPORT_SYMBOL(pcim_iomap_table); | |
331 | ||
332 | /** | |
333 | * pcim_iomap - Managed pcim_iomap() | |
334 | * @pdev: PCI device to iomap for | |
335 | * @bar: BAR to iomap | |
336 | * @maxlen: Maximum length of iomap | |
337 | * | |
338 | * Managed pci_iomap(). Map is automatically unmapped on driver | |
339 | * detach. | |
340 | */ | |
341 | void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen) | |
342 | { | |
343 | void __iomem **tbl; | |
344 | ||
345 | BUG_ON(bar >= PCIM_IOMAP_MAX); | |
346 | ||
347 | tbl = (void __iomem **)pcim_iomap_table(pdev); | |
348 | if (!tbl || tbl[bar]) /* duplicate mappings not allowed */ | |
349 | return NULL; | |
350 | ||
351 | tbl[bar] = pci_iomap(pdev, bar, maxlen); | |
352 | return tbl[bar]; | |
353 | } | |
354 | EXPORT_SYMBOL(pcim_iomap); | |
355 | ||
356 | /** | |
357 | * pcim_iounmap - Managed pci_iounmap() | |
358 | * @pdev: PCI device to iounmap for | |
359 | * @addr: Address to unmap | |
360 | * | |
361 | * Managed pci_iounmap(). @addr must have been mapped using pcim_iomap(). | |
362 | */ | |
363 | void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr) | |
364 | { | |
365 | void __iomem **tbl; | |
366 | int i; | |
367 | ||
368 | pci_iounmap(pdev, addr); | |
369 | ||
370 | tbl = (void __iomem **)pcim_iomap_table(pdev); | |
371 | BUG_ON(!tbl); | |
372 | ||
373 | for (i = 0; i < PCIM_IOMAP_MAX; i++) | |
374 | if (tbl[i] == addr) { | |
375 | tbl[i] = NULL; | |
376 | return; | |
377 | } | |
378 | WARN_ON(1); | |
379 | } | |
380 | EXPORT_SYMBOL(pcim_iounmap); | |
381 | ||
382 | /** | |
383 | * pcim_iomap_regions - Request and iomap PCI BARs | |
384 | * @pdev: PCI device to map IO resources for | |
385 | * @mask: Mask of BARs to request and iomap | |
386 | * @name: Name used when requesting regions | |
387 | * | |
388 | * Request and iomap regions specified by @mask. | |
389 | */ | |
390 | int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name) | |
391 | { | |
392 | void __iomem * const *iomap; | |
393 | int i, rc; | |
394 | ||
395 | iomap = pcim_iomap_table(pdev); | |
396 | if (!iomap) | |
397 | return -ENOMEM; | |
398 | ||
399 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { | |
400 | unsigned long len; | |
401 | ||
402 | if (!(mask & (1 << i))) | |
403 | continue; | |
404 | ||
405 | rc = -EINVAL; | |
406 | len = pci_resource_len(pdev, i); | |
407 | if (!len) | |
408 | goto err_inval; | |
409 | ||
410 | rc = pci_request_region(pdev, i, name); | |
411 | if (rc) | |
412 | goto err_inval; | |
413 | ||
414 | rc = -ENOMEM; | |
415 | if (!pcim_iomap(pdev, i, 0)) | |
416 | goto err_region; | |
417 | } | |
418 | ||
419 | return 0; | |
420 | ||
421 | err_region: | |
422 | pci_release_region(pdev, i); | |
423 | err_inval: | |
424 | while (--i >= 0) { | |
425 | if (!(mask & (1 << i))) | |
426 | continue; | |
427 | pcim_iounmap(pdev, iomap[i]); | |
428 | pci_release_region(pdev, i); | |
429 | } | |
430 | ||
431 | return rc; | |
432 | } | |
433 | EXPORT_SYMBOL(pcim_iomap_regions); | |
434 | ||
435 | /** | |
436 | * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones | |
437 | * @pdev: PCI device to map IO resources for | |
438 | * @mask: Mask of BARs to iomap | |
439 | * @name: Name used when requesting regions | |
440 | * | |
441 | * Request all PCI BARs and iomap regions specified by @mask. | |
442 | */ | |
443 | int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask, | |
444 | const char *name) | |
445 | { | |
446 | int request_mask = ((1 << 6) - 1) & ~mask; | |
447 | int rc; | |
448 | ||
449 | rc = pci_request_selected_regions(pdev, request_mask, name); | |
450 | if (rc) | |
451 | return rc; | |
452 | ||
453 | rc = pcim_iomap_regions(pdev, mask, name); | |
454 | if (rc) | |
455 | pci_release_selected_regions(pdev, request_mask); | |
456 | return rc; | |
457 | } | |
458 | EXPORT_SYMBOL(pcim_iomap_regions_request_all); | |
459 | ||
460 | /** | |
461 | * pcim_iounmap_regions - Unmap and release PCI BARs | |
462 | * @pdev: PCI device to map IO resources for | |
463 | * @mask: Mask of BARs to unmap and release | |
464 | * | |
465 | * Unmap and release regions specified by @mask. | |
466 | */ | |
467 | void pcim_iounmap_regions(struct pci_dev *pdev, int mask) | |
468 | { | |
469 | void __iomem * const *iomap; | |
470 | int i; | |
471 | ||
472 | iomap = pcim_iomap_table(pdev); | |
473 | if (!iomap) | |
474 | return; | |
475 | ||
476 | for (i = 0; i < PCIM_IOMAP_MAX; i++) { | |
477 | if (!(mask & (1 << i))) | |
478 | continue; | |
479 | ||
480 | pcim_iounmap(pdev, iomap[i]); | |
481 | pci_release_region(pdev, i); | |
482 | } | |
483 | } | |
484 | EXPORT_SYMBOL(pcim_iounmap_regions); | |
485 | #endif /* CONFIG_PCI */ |