1 // SPDX-License-Identifier: GPL-2.0
6 #include <linux/export.h>
7 #include <linux/of_address.h>
9 enum devm_ioremap_type {
16 void devm_ioremap_release(struct device *dev, void *res)
18 iounmap(*(void __iomem **)res);
21 static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
23 return *(void **)res == match_data;
26 static void __iomem *__devm_ioremap(struct device *dev, resource_size_t offset,
28 enum devm_ioremap_type type)
30 void __iomem **ptr, *addr = NULL;
32 ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
38 addr = ioremap(offset, size);
41 addr = ioremap_uc(offset, size);
44 addr = ioremap_wc(offset, size);
47 addr = ioremap_np(offset, size);
61 * devm_ioremap - Managed ioremap()
62 * @dev: Generic device to remap IO address for
63 * @offset: Resource address to map
66 * Managed ioremap(). Map is automatically unmapped on driver detach.
68 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
71 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP);
73 EXPORT_SYMBOL(devm_ioremap);
76 * devm_ioremap_uc - Managed ioremap_uc()
77 * @dev: Generic device to remap IO address for
78 * @offset: Resource address to map
81 * Managed ioremap_uc(). Map is automatically unmapped on driver detach.
83 void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset,
86 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_UC);
88 EXPORT_SYMBOL_GPL(devm_ioremap_uc);
91 * devm_ioremap_wc - Managed ioremap_wc()
92 * @dev: Generic device to remap IO address for
93 * @offset: Resource address to map
96 * Managed ioremap_wc(). Map is automatically unmapped on driver detach.
98 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
101 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_WC);
103 EXPORT_SYMBOL(devm_ioremap_wc);
106 * devm_ioremap_np - Managed ioremap_np()
107 * @dev: Generic device to remap IO address for
108 * @offset: Resource address to map
111 * Managed ioremap_np(). Map is automatically unmapped on driver detach.
113 void __iomem *devm_ioremap_np(struct device *dev, resource_size_t offset,
114 resource_size_t size)
116 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_NP);
118 EXPORT_SYMBOL(devm_ioremap_np);
121 * devm_iounmap - Managed iounmap()
122 * @dev: Generic device to unmap for
123 * @addr: Address to unmap
125 * Managed iounmap(). @addr must have been mapped using devm_ioremap*().
127 void devm_iounmap(struct device *dev, void __iomem *addr)
129 WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
130 (__force void *)addr));
133 EXPORT_SYMBOL(devm_iounmap);
135 static void __iomem *
136 __devm_ioremap_resource(struct device *dev, const struct resource *res,
137 enum devm_ioremap_type type)
139 resource_size_t size;
140 void __iomem *dest_ptr;
145 if (!res || resource_type(res) != IORESOURCE_MEM) {
146 dev_err(dev, "invalid resource\n");
147 return IOMEM_ERR_PTR(-EINVAL);
150 if (type == DEVM_IOREMAP && res->flags & IORESOURCE_MEM_NONPOSTED)
151 type = DEVM_IOREMAP_NP;
153 size = resource_size(res);
156 pretty_name = devm_kasprintf(dev, GFP_KERNEL, "%s %s",
157 dev_name(dev), res->name);
159 pretty_name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
161 dev_err(dev, "can't generate pretty name for resource %pR\n", res);
162 return IOMEM_ERR_PTR(-ENOMEM);
165 if (!devm_request_mem_region(dev, res->start, size, pretty_name)) {
166 dev_err(dev, "can't request region for resource %pR\n", res);
167 return IOMEM_ERR_PTR(-EBUSY);
170 dest_ptr = __devm_ioremap(dev, res->start, size, type);
172 dev_err(dev, "ioremap failed for resource %pR\n", res);
173 devm_release_mem_region(dev, res->start, size);
174 dest_ptr = IOMEM_ERR_PTR(-ENOMEM);
181 * devm_ioremap_resource() - check, request region, and ioremap resource
182 * @dev: generic device to handle the resource for
183 * @res: resource to be handled
185 * Checks that a resource is a valid memory region, requests the memory
186 * region and ioremaps it. All operations are managed and will be undone
191 * res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
192 * base = devm_ioremap_resource(&pdev->dev, res);
194 * return PTR_ERR(base);
196 * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
199 void __iomem *devm_ioremap_resource(struct device *dev,
200 const struct resource *res)
202 return __devm_ioremap_resource(dev, res, DEVM_IOREMAP);
204 EXPORT_SYMBOL(devm_ioremap_resource);
207 * devm_ioremap_resource_wc() - write-combined variant of
208 * devm_ioremap_resource()
209 * @dev: generic device to handle the resource for
210 * @res: resource to be handled
212 * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
215 void __iomem *devm_ioremap_resource_wc(struct device *dev,
216 const struct resource *res)
218 return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_WC);
222 * devm_of_iomap - Requests a resource and maps the memory mapped IO
223 * for a given device_node managed by a given device
225 * Checks that a resource is a valid memory region, requests the memory
226 * region and ioremaps it. All operations are managed and will be undone
227 * on driver detach of the device.
229 * This is to be used when a device requests/maps resources described
230 * by other device tree nodes (children or otherwise).
232 * @dev: The device "managing" the resource
233 * @node: The device-tree node where the resource resides
234 * @index: index of the MMIO range in the "reg" property
235 * @size: Returns the size of the resource (pass NULL if not needed)
239 * base = devm_of_iomap(&pdev->dev, node, 0, NULL);
241 * return PTR_ERR(base);
243 * Please Note: This is not a one-to-one replacement for of_iomap() because the
244 * of_iomap() function does not track whether the region is already mapped. If
245 * two drivers try to map the same memory, the of_iomap() function will succeed
246 * but the devm_of_iomap() function will return -EBUSY.
248 * Return: a pointer to the requested and mapped memory or an ERR_PTR() encoded
249 * error code on failure.
251 void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index,
252 resource_size_t *size)
256 if (of_address_to_resource(node, index, &res))
257 return IOMEM_ERR_PTR(-EINVAL);
259 *size = resource_size(&res);
260 return devm_ioremap_resource(dev, &res);
262 EXPORT_SYMBOL(devm_of_iomap);
264 #ifdef CONFIG_HAS_IOPORT_MAP
266 * Generic iomap devres
268 static void devm_ioport_map_release(struct device *dev, void *res)
270 ioport_unmap(*(void __iomem **)res);
273 static int devm_ioport_map_match(struct device *dev, void *res,
276 return *(void **)res == match_data;
280 * devm_ioport_map - Managed ioport_map()
281 * @dev: Generic device to map ioport for
283 * @nr: Number of ports to map
285 * Managed ioport_map(). Map is automatically unmapped on driver
288 * Return: a pointer to the remapped memory or NULL on failure.
290 void __iomem *devm_ioport_map(struct device *dev, unsigned long port,
293 void __iomem **ptr, *addr;
295 ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
299 addr = ioport_map(port, nr);
302 devres_add(dev, ptr);
308 EXPORT_SYMBOL(devm_ioport_map);
311 * devm_ioport_unmap - Managed ioport_unmap()
312 * @dev: Generic device to unmap for
313 * @addr: Address to unmap
315 * Managed ioport_unmap(). @addr must have been mapped using
318 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
321 WARN_ON(devres_destroy(dev, devm_ioport_map_release,
322 devm_ioport_map_match, (__force void *)addr));
324 EXPORT_SYMBOL(devm_ioport_unmap);
325 #endif /* CONFIG_HAS_IOPORT_MAP */
331 #define PCIM_IOMAP_MAX PCI_STD_NUM_BARS
333 struct pcim_iomap_devres {
334 void __iomem *table[PCIM_IOMAP_MAX];
337 static void pcim_iomap_release(struct device *gendev, void *res)
339 struct pci_dev *dev = to_pci_dev(gendev);
340 struct pcim_iomap_devres *this = res;
343 for (i = 0; i < PCIM_IOMAP_MAX; i++)
345 pci_iounmap(dev, this->table[i]);
349 * pcim_iomap_table - access iomap allocation table
350 * @pdev: PCI device to access iomap table for
352 * Access iomap allocation table for @dev. If iomap table doesn't
353 * exist and @pdev is managed, it will be allocated. All iomaps
354 * recorded in the iomap table are automatically unmapped on driver
357 * This function might sleep when the table is first allocated but can
358 * be safely called without context and guaranteed to succeed once
361 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
363 struct pcim_iomap_devres *dr, *new_dr;
365 dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
369 new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
372 dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
375 EXPORT_SYMBOL(pcim_iomap_table);
378 * pcim_iomap - Managed pcim_iomap()
379 * @pdev: PCI device to iomap for
381 * @maxlen: Maximum length of iomap
383 * Managed pci_iomap(). Map is automatically unmapped on driver
386 void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
390 BUG_ON(bar >= PCIM_IOMAP_MAX);
392 tbl = (void __iomem **)pcim_iomap_table(pdev);
393 if (!tbl || tbl[bar]) /* duplicate mappings not allowed */
396 tbl[bar] = pci_iomap(pdev, bar, maxlen);
399 EXPORT_SYMBOL(pcim_iomap);
402 * pcim_iounmap - Managed pci_iounmap()
403 * @pdev: PCI device to iounmap for
404 * @addr: Address to unmap
406 * Managed pci_iounmap(). @addr must have been mapped using pcim_iomap().
408 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
413 pci_iounmap(pdev, addr);
415 tbl = (void __iomem **)pcim_iomap_table(pdev);
418 for (i = 0; i < PCIM_IOMAP_MAX; i++)
419 if (tbl[i] == addr) {
425 EXPORT_SYMBOL(pcim_iounmap);
428 * pcim_iomap_regions - Request and iomap PCI BARs
429 * @pdev: PCI device to map IO resources for
430 * @mask: Mask of BARs to request and iomap
431 * @name: Name used when requesting regions
433 * Request and iomap regions specified by @mask.
435 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
437 void __iomem * const *iomap;
440 iomap = pcim_iomap_table(pdev);
444 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
447 if (!(mask & (1 << i)))
451 len = pci_resource_len(pdev, i);
455 rc = pci_request_region(pdev, i, name);
460 if (!pcim_iomap(pdev, i, 0))
467 pci_release_region(pdev, i);
470 if (!(mask & (1 << i)))
472 pcim_iounmap(pdev, iomap[i]);
473 pci_release_region(pdev, i);
478 EXPORT_SYMBOL(pcim_iomap_regions);
481 * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
482 * @pdev: PCI device to map IO resources for
483 * @mask: Mask of BARs to iomap
484 * @name: Name used when requesting regions
486 * Request all PCI BARs and iomap regions specified by @mask.
488 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
491 int request_mask = ((1 << 6) - 1) & ~mask;
494 rc = pci_request_selected_regions(pdev, request_mask, name);
498 rc = pcim_iomap_regions(pdev, mask, name);
500 pci_release_selected_regions(pdev, request_mask);
503 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
506 * pcim_iounmap_regions - Unmap and release PCI BARs
507 * @pdev: PCI device to map IO resources for
508 * @mask: Mask of BARs to unmap and release
510 * Unmap and release regions specified by @mask.
512 void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
514 void __iomem * const *iomap;
517 iomap = pcim_iomap_table(pdev);
521 for (i = 0; i < PCIM_IOMAP_MAX; i++) {
522 if (!(mask & (1 << i)))
525 pcim_iounmap(pdev, iomap[i]);
526 pci_release_region(pdev, i);
529 EXPORT_SYMBOL(pcim_iounmap_regions);
530 #endif /* CONFIG_PCI */
532 static void devm_arch_phys_ac_add_release(struct device *dev, void *res)
534 arch_phys_wc_del(*((int *)res));
538 * devm_arch_phys_wc_add - Managed arch_phys_wc_add()
539 * @dev: Managed device
540 * @base: Memory base address
541 * @size: Size of memory range
543 * Adds a WC MTRR using arch_phys_wc_add() and sets up a release callback.
544 * See arch_phys_wc_add() for more information.
546 int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long size)
551 mtrr = devres_alloc(devm_arch_phys_ac_add_release, sizeof(*mtrr), GFP_KERNEL);
555 ret = arch_phys_wc_add(base, size);
562 devres_add(dev, mtrr);
566 EXPORT_SYMBOL(devm_arch_phys_wc_add);
568 struct arch_io_reserve_memtype_wc_devres {
569 resource_size_t start;
570 resource_size_t size;
573 static void devm_arch_io_free_memtype_wc_release(struct device *dev, void *res)
575 const struct arch_io_reserve_memtype_wc_devres *this = res;
577 arch_io_free_memtype_wc(this->start, this->size);
581 * devm_arch_io_reserve_memtype_wc - Managed arch_io_reserve_memtype_wc()
582 * @dev: Managed device
583 * @start: Memory base address
584 * @size: Size of memory range
586 * Reserves a memory range with WC caching using arch_io_reserve_memtype_wc()
587 * and sets up a release callback See arch_io_reserve_memtype_wc() for more
590 int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start,
591 resource_size_t size)
593 struct arch_io_reserve_memtype_wc_devres *dr;
596 dr = devres_alloc(devm_arch_io_free_memtype_wc_release, sizeof(*dr), GFP_KERNEL);
600 ret = arch_io_reserve_memtype_wc(start, size);
612 EXPORT_SYMBOL(devm_arch_io_reserve_memtype_wc);