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_node(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL,
39 addr = ioremap(offset, size);
42 addr = ioremap_uc(offset, size);
45 addr = ioremap_wc(offset, size);
48 addr = ioremap_np(offset, size);
62 * devm_ioremap - Managed ioremap()
63 * @dev: Generic device to remap IO address for
64 * @offset: Resource address to map
67 * Managed ioremap(). Map is automatically unmapped on driver detach.
69 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
72 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP);
74 EXPORT_SYMBOL(devm_ioremap);
77 * devm_ioremap_uc - Managed ioremap_uc()
78 * @dev: Generic device to remap IO address for
79 * @offset: Resource address to map
82 * Managed ioremap_uc(). Map is automatically unmapped on driver detach.
84 void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset,
87 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_UC);
89 EXPORT_SYMBOL_GPL(devm_ioremap_uc);
92 * devm_ioremap_wc - Managed ioremap_wc()
93 * @dev: Generic device to remap IO address for
94 * @offset: Resource address to map
97 * Managed ioremap_wc(). Map is automatically unmapped on driver detach.
99 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
100 resource_size_t size)
102 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_WC);
104 EXPORT_SYMBOL(devm_ioremap_wc);
107 * devm_iounmap - Managed iounmap()
108 * @dev: Generic device to unmap for
109 * @addr: Address to unmap
111 * Managed iounmap(). @addr must have been mapped using devm_ioremap*().
113 void devm_iounmap(struct device *dev, void __iomem *addr)
115 WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
116 (__force void *)addr));
119 EXPORT_SYMBOL(devm_iounmap);
121 static void __iomem *
122 __devm_ioremap_resource(struct device *dev, const struct resource *res,
123 enum devm_ioremap_type type)
125 resource_size_t size;
126 void __iomem *dest_ptr;
131 if (!res || resource_type(res) != IORESOURCE_MEM) {
132 dev_err(dev, "invalid resource %pR\n", res);
133 return IOMEM_ERR_PTR(-EINVAL);
136 if (type == DEVM_IOREMAP && res->flags & IORESOURCE_MEM_NONPOSTED)
137 type = DEVM_IOREMAP_NP;
139 size = resource_size(res);
142 pretty_name = devm_kasprintf(dev, GFP_KERNEL, "%s %s",
143 dev_name(dev), res->name);
145 pretty_name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
147 dev_err(dev, "can't generate pretty name for resource %pR\n", res);
148 return IOMEM_ERR_PTR(-ENOMEM);
151 if (!devm_request_mem_region(dev, res->start, size, pretty_name)) {
152 dev_err(dev, "can't request region for resource %pR\n", res);
153 return IOMEM_ERR_PTR(-EBUSY);
156 dest_ptr = __devm_ioremap(dev, res->start, size, type);
158 dev_err(dev, "ioremap failed for resource %pR\n", res);
159 devm_release_mem_region(dev, res->start, size);
160 dest_ptr = IOMEM_ERR_PTR(-ENOMEM);
167 * devm_ioremap_resource() - check, request region, and ioremap resource
168 * @dev: generic device to handle the resource for
169 * @res: resource to be handled
171 * Checks that a resource is a valid memory region, requests the memory
172 * region and ioremaps it. All operations are managed and will be undone
177 * res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
178 * base = devm_ioremap_resource(&pdev->dev, res);
180 * return PTR_ERR(base);
182 * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
185 void __iomem *devm_ioremap_resource(struct device *dev,
186 const struct resource *res)
188 return __devm_ioremap_resource(dev, res, DEVM_IOREMAP);
190 EXPORT_SYMBOL(devm_ioremap_resource);
193 * devm_ioremap_resource_wc() - write-combined variant of
194 * devm_ioremap_resource()
195 * @dev: generic device to handle the resource for
196 * @res: resource to be handled
198 * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
201 void __iomem *devm_ioremap_resource_wc(struct device *dev,
202 const struct resource *res)
204 return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_WC);
208 * devm_of_iomap - Requests a resource and maps the memory mapped IO
209 * for a given device_node managed by a given device
211 * Checks that a resource is a valid memory region, requests the memory
212 * region and ioremaps it. All operations are managed and will be undone
213 * on driver detach of the device.
215 * This is to be used when a device requests/maps resources described
216 * by other device tree nodes (children or otherwise).
218 * @dev: The device "managing" the resource
219 * @node: The device-tree node where the resource resides
220 * @index: index of the MMIO range in the "reg" property
221 * @size: Returns the size of the resource (pass NULL if not needed)
225 * base = devm_of_iomap(&pdev->dev, node, 0, NULL);
227 * return PTR_ERR(base);
229 * Please Note: This is not a one-to-one replacement for of_iomap() because the
230 * of_iomap() function does not track whether the region is already mapped. If
231 * two drivers try to map the same memory, the of_iomap() function will succeed
232 * but the devm_of_iomap() function will return -EBUSY.
234 * Return: a pointer to the requested and mapped memory or an ERR_PTR() encoded
235 * error code on failure.
237 void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index,
238 resource_size_t *size)
242 if (of_address_to_resource(node, index, &res))
243 return IOMEM_ERR_PTR(-EINVAL);
245 *size = resource_size(&res);
246 return devm_ioremap_resource(dev, &res);
248 EXPORT_SYMBOL(devm_of_iomap);
250 #ifdef CONFIG_HAS_IOPORT_MAP
252 * Generic iomap devres
254 static void devm_ioport_map_release(struct device *dev, void *res)
256 ioport_unmap(*(void __iomem **)res);
259 static int devm_ioport_map_match(struct device *dev, void *res,
262 return *(void **)res == match_data;
266 * devm_ioport_map - Managed ioport_map()
267 * @dev: Generic device to map ioport for
269 * @nr: Number of ports to map
271 * Managed ioport_map(). Map is automatically unmapped on driver
274 * Return: a pointer to the remapped memory or NULL on failure.
276 void __iomem *devm_ioport_map(struct device *dev, unsigned long port,
279 void __iomem **ptr, *addr;
281 ptr = devres_alloc_node(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL,
286 addr = ioport_map(port, nr);
289 devres_add(dev, ptr);
295 EXPORT_SYMBOL(devm_ioport_map);
298 * devm_ioport_unmap - Managed ioport_unmap()
299 * @dev: Generic device to unmap for
300 * @addr: Address to unmap
302 * Managed ioport_unmap(). @addr must have been mapped using
305 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
308 WARN_ON(devres_destroy(dev, devm_ioport_map_release,
309 devm_ioport_map_match, (__force void *)addr));
311 EXPORT_SYMBOL(devm_ioport_unmap);
312 #endif /* CONFIG_HAS_IOPORT_MAP */
318 #define PCIM_IOMAP_MAX PCI_STD_NUM_BARS
320 struct pcim_iomap_devres {
321 void __iomem *table[PCIM_IOMAP_MAX];
324 static void pcim_iomap_release(struct device *gendev, void *res)
326 struct pci_dev *dev = to_pci_dev(gendev);
327 struct pcim_iomap_devres *this = res;
330 for (i = 0; i < PCIM_IOMAP_MAX; i++)
332 pci_iounmap(dev, this->table[i]);
336 * pcim_iomap_table - access iomap allocation table
337 * @pdev: PCI device to access iomap table for
339 * Access iomap allocation table for @dev. If iomap table doesn't
340 * exist and @pdev is managed, it will be allocated. All iomaps
341 * recorded in the iomap table are automatically unmapped on driver
344 * This function might sleep when the table is first allocated but can
345 * be safely called without context and guaranteed to succeed once
348 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
350 struct pcim_iomap_devres *dr, *new_dr;
352 dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
356 new_dr = devres_alloc_node(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL,
357 dev_to_node(&pdev->dev));
360 dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
363 EXPORT_SYMBOL(pcim_iomap_table);
366 * pcim_iomap - Managed pcim_iomap()
367 * @pdev: PCI device to iomap for
369 * @maxlen: Maximum length of iomap
371 * Managed pci_iomap(). Map is automatically unmapped on driver
374 void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
378 BUG_ON(bar >= PCIM_IOMAP_MAX);
380 tbl = (void __iomem **)pcim_iomap_table(pdev);
381 if (!tbl || tbl[bar]) /* duplicate mappings not allowed */
384 tbl[bar] = pci_iomap(pdev, bar, maxlen);
387 EXPORT_SYMBOL(pcim_iomap);
390 * pcim_iounmap - Managed pci_iounmap()
391 * @pdev: PCI device to iounmap for
392 * @addr: Address to unmap
394 * Managed pci_iounmap(). @addr must have been mapped using pcim_iomap().
396 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
401 pci_iounmap(pdev, addr);
403 tbl = (void __iomem **)pcim_iomap_table(pdev);
406 for (i = 0; i < PCIM_IOMAP_MAX; i++)
407 if (tbl[i] == addr) {
413 EXPORT_SYMBOL(pcim_iounmap);
416 * pcim_iomap_regions - Request and iomap PCI BARs
417 * @pdev: PCI device to map IO resources for
418 * @mask: Mask of BARs to request and iomap
419 * @name: Name used when requesting regions
421 * Request and iomap regions specified by @mask.
423 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
425 void __iomem * const *iomap;
428 iomap = pcim_iomap_table(pdev);
432 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
435 if (!(mask & (1 << i)))
439 len = pci_resource_len(pdev, i);
443 rc = pci_request_region(pdev, i, name);
448 if (!pcim_iomap(pdev, i, 0))
455 pci_release_region(pdev, i);
458 if (!(mask & (1 << i)))
460 pcim_iounmap(pdev, iomap[i]);
461 pci_release_region(pdev, i);
466 EXPORT_SYMBOL(pcim_iomap_regions);
469 * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
470 * @pdev: PCI device to map IO resources for
471 * @mask: Mask of BARs to iomap
472 * @name: Name used when requesting regions
474 * Request all PCI BARs and iomap regions specified by @mask.
476 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
479 int request_mask = ((1 << 6) - 1) & ~mask;
482 rc = pci_request_selected_regions(pdev, request_mask, name);
486 rc = pcim_iomap_regions(pdev, mask, name);
488 pci_release_selected_regions(pdev, request_mask);
491 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
494 * pcim_iounmap_regions - Unmap and release PCI BARs
495 * @pdev: PCI device to map IO resources for
496 * @mask: Mask of BARs to unmap and release
498 * Unmap and release regions specified by @mask.
500 void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
502 void __iomem * const *iomap;
505 iomap = pcim_iomap_table(pdev);
509 for (i = 0; i < PCIM_IOMAP_MAX; i++) {
510 if (!(mask & (1 << i)))
513 pcim_iounmap(pdev, iomap[i]);
514 pci_release_region(pdev, i);
517 EXPORT_SYMBOL(pcim_iounmap_regions);
518 #endif /* CONFIG_PCI */
520 static void devm_arch_phys_ac_add_release(struct device *dev, void *res)
522 arch_phys_wc_del(*((int *)res));
526 * devm_arch_phys_wc_add - Managed arch_phys_wc_add()
527 * @dev: Managed device
528 * @base: Memory base address
529 * @size: Size of memory range
531 * Adds a WC MTRR using arch_phys_wc_add() and sets up a release callback.
532 * See arch_phys_wc_add() for more information.
534 int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long size)
539 mtrr = devres_alloc_node(devm_arch_phys_ac_add_release, sizeof(*mtrr), GFP_KERNEL,
544 ret = arch_phys_wc_add(base, size);
551 devres_add(dev, mtrr);
555 EXPORT_SYMBOL(devm_arch_phys_wc_add);
557 struct arch_io_reserve_memtype_wc_devres {
558 resource_size_t start;
559 resource_size_t size;
562 static void devm_arch_io_free_memtype_wc_release(struct device *dev, void *res)
564 const struct arch_io_reserve_memtype_wc_devres *this = res;
566 arch_io_free_memtype_wc(this->start, this->size);
570 * devm_arch_io_reserve_memtype_wc - Managed arch_io_reserve_memtype_wc()
571 * @dev: Managed device
572 * @start: Memory base address
573 * @size: Size of memory range
575 * Reserves a memory range with WC caching using arch_io_reserve_memtype_wc()
576 * and sets up a release callback See arch_io_reserve_memtype_wc() for more
579 int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start,
580 resource_size_t size)
582 struct arch_io_reserve_memtype_wc_devres *dr;
585 dr = devres_alloc_node(devm_arch_io_free_memtype_wc_release, sizeof(*dr), GFP_KERNEL,
590 ret = arch_io_reserve_memtype_wc(start, size);
602 EXPORT_SYMBOL(devm_arch_io_reserve_memtype_wc);