1 // SPDX-License-Identifier: GPL-2.0
6 #include <linux/export.h>
7 #include <linux/of_address.h>
9 enum devm_ioremap_type {
15 void devm_ioremap_release(struct device *dev, void *res)
17 iounmap(*(void __iomem **)res);
20 static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
22 return *(void **)res == match_data;
25 static void __iomem *__devm_ioremap(struct device *dev, resource_size_t offset,
27 enum devm_ioremap_type type)
29 void __iomem **ptr, *addr = NULL;
31 ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
37 addr = ioremap(offset, size);
40 addr = ioremap_uc(offset, size);
43 addr = ioremap_wc(offset, size);
57 * devm_ioremap - Managed ioremap()
58 * @dev: Generic device to remap IO address for
59 * @offset: Resource address to map
62 * Managed ioremap(). Map is automatically unmapped on driver detach.
64 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
67 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP);
69 EXPORT_SYMBOL(devm_ioremap);
72 * devm_ioremap_uc - Managed ioremap_uc()
73 * @dev: Generic device to remap IO address for
74 * @offset: Resource address to map
77 * Managed ioremap_uc(). Map is automatically unmapped on driver detach.
79 void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset,
82 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_UC);
84 EXPORT_SYMBOL_GPL(devm_ioremap_uc);
87 * devm_ioremap_wc - Managed ioremap_wc()
88 * @dev: Generic device to remap IO address for
89 * @offset: Resource address to map
92 * Managed ioremap_wc(). Map is automatically unmapped on driver detach.
94 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
97 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_WC);
99 EXPORT_SYMBOL(devm_ioremap_wc);
102 * devm_iounmap - Managed iounmap()
103 * @dev: Generic device to unmap for
104 * @addr: Address to unmap
106 * Managed iounmap(). @addr must have been mapped using devm_ioremap*().
108 void devm_iounmap(struct device *dev, void __iomem *addr)
110 WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
111 (__force void *)addr));
114 EXPORT_SYMBOL(devm_iounmap);
116 static void __iomem *
117 __devm_ioremap_resource(struct device *dev, const struct resource *res,
118 enum devm_ioremap_type type)
120 resource_size_t size;
121 void __iomem *dest_ptr;
126 if (!res || resource_type(res) != IORESOURCE_MEM) {
127 dev_err(dev, "invalid resource\n");
128 return IOMEM_ERR_PTR(-EINVAL);
131 size = resource_size(res);
134 pretty_name = devm_kasprintf(dev, GFP_KERNEL, "%s %s",
135 dev_name(dev), res->name);
137 pretty_name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
139 return IOMEM_ERR_PTR(-ENOMEM);
141 if (!devm_request_mem_region(dev, res->start, size, pretty_name)) {
142 dev_err(dev, "can't request region for resource %pR\n", res);
143 return IOMEM_ERR_PTR(-EBUSY);
146 dest_ptr = __devm_ioremap(dev, res->start, size, type);
148 dev_err(dev, "ioremap failed for resource %pR\n", res);
149 devm_release_mem_region(dev, res->start, size);
150 dest_ptr = IOMEM_ERR_PTR(-ENOMEM);
157 * devm_ioremap_resource() - check, request region, and ioremap resource
158 * @dev: generic device to handle the resource for
159 * @res: resource to be handled
161 * Checks that a resource is a valid memory region, requests the memory
162 * region and ioremaps it. All operations are managed and will be undone
165 * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
166 * on failure. Usage example:
168 * res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
169 * base = devm_ioremap_resource(&pdev->dev, res);
171 * return PTR_ERR(base);
173 void __iomem *devm_ioremap_resource(struct device *dev,
174 const struct resource *res)
176 return __devm_ioremap_resource(dev, res, DEVM_IOREMAP);
178 EXPORT_SYMBOL(devm_ioremap_resource);
181 * devm_ioremap_resource_wc() - write-combined variant of
182 * devm_ioremap_resource()
183 * @dev: generic device to handle the resource for
184 * @res: resource to be handled
186 * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
187 * on failure. Usage example:
189 void __iomem *devm_ioremap_resource_wc(struct device *dev,
190 const struct resource *res)
192 return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_WC);
196 * devm_of_iomap - Requests a resource and maps the memory mapped IO
197 * for a given device_node managed by a given device
199 * Checks that a resource is a valid memory region, requests the memory
200 * region and ioremaps it. All operations are managed and will be undone
201 * on driver detach of the device.
203 * This is to be used when a device requests/maps resources described
204 * by other device tree nodes (children or otherwise).
206 * @dev: The device "managing" the resource
207 * @node: The device-tree node where the resource resides
208 * @index: index of the MMIO range in the "reg" property
209 * @size: Returns the size of the resource (pass NULL if not needed)
210 * Returns a pointer to the requested and mapped memory or an ERR_PTR() encoded
211 * error code on failure. Usage example:
213 * base = devm_of_iomap(&pdev->dev, node, 0, NULL);
215 * return PTR_ERR(base);
217 * Please Note: This is not a one-to-one replacement for of_iomap() because the
218 * of_iomap() function does not track whether the region is already mapped. If
219 * two drivers try to map the same memory, the of_iomap() function will succeed
220 * but the the devm_of_iomap() function will return -EBUSY.
223 void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index,
224 resource_size_t *size)
228 if (of_address_to_resource(node, index, &res))
229 return IOMEM_ERR_PTR(-EINVAL);
231 *size = resource_size(&res);
232 return devm_ioremap_resource(dev, &res);
234 EXPORT_SYMBOL(devm_of_iomap);
236 #ifdef CONFIG_HAS_IOPORT_MAP
238 * Generic iomap devres
240 static void devm_ioport_map_release(struct device *dev, void *res)
242 ioport_unmap(*(void __iomem **)res);
245 static int devm_ioport_map_match(struct device *dev, void *res,
248 return *(void **)res == match_data;
252 * devm_ioport_map - Managed ioport_map()
253 * @dev: Generic device to map ioport for
255 * @nr: Number of ports to map
257 * Managed ioport_map(). Map is automatically unmapped on driver
260 void __iomem *devm_ioport_map(struct device *dev, unsigned long port,
263 void __iomem **ptr, *addr;
265 ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
269 addr = ioport_map(port, nr);
272 devres_add(dev, ptr);
278 EXPORT_SYMBOL(devm_ioport_map);
281 * devm_ioport_unmap - Managed ioport_unmap()
282 * @dev: Generic device to unmap for
283 * @addr: Address to unmap
285 * Managed ioport_unmap(). @addr must have been mapped using
288 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
291 WARN_ON(devres_destroy(dev, devm_ioport_map_release,
292 devm_ioport_map_match, (__force void *)addr));
294 EXPORT_SYMBOL(devm_ioport_unmap);
295 #endif /* CONFIG_HAS_IOPORT_MAP */
301 #define PCIM_IOMAP_MAX PCI_STD_NUM_BARS
303 struct pcim_iomap_devres {
304 void __iomem *table[PCIM_IOMAP_MAX];
307 static void pcim_iomap_release(struct device *gendev, void *res)
309 struct pci_dev *dev = to_pci_dev(gendev);
310 struct pcim_iomap_devres *this = res;
313 for (i = 0; i < PCIM_IOMAP_MAX; i++)
315 pci_iounmap(dev, this->table[i]);
319 * pcim_iomap_table - access iomap allocation table
320 * @pdev: PCI device to access iomap table for
322 * Access iomap allocation table for @dev. If iomap table doesn't
323 * exist and @pdev is managed, it will be allocated. All iomaps
324 * recorded in the iomap table are automatically unmapped on driver
327 * This function might sleep when the table is first allocated but can
328 * be safely called without context and guaranteed to succed once
331 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
333 struct pcim_iomap_devres *dr, *new_dr;
335 dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
339 new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
342 dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
345 EXPORT_SYMBOL(pcim_iomap_table);
348 * pcim_iomap - Managed pcim_iomap()
349 * @pdev: PCI device to iomap for
351 * @maxlen: Maximum length of iomap
353 * Managed pci_iomap(). Map is automatically unmapped on driver
356 void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
360 BUG_ON(bar >= PCIM_IOMAP_MAX);
362 tbl = (void __iomem **)pcim_iomap_table(pdev);
363 if (!tbl || tbl[bar]) /* duplicate mappings not allowed */
366 tbl[bar] = pci_iomap(pdev, bar, maxlen);
369 EXPORT_SYMBOL(pcim_iomap);
372 * pcim_iounmap - Managed pci_iounmap()
373 * @pdev: PCI device to iounmap for
374 * @addr: Address to unmap
376 * Managed pci_iounmap(). @addr must have been mapped using pcim_iomap().
378 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
383 pci_iounmap(pdev, addr);
385 tbl = (void __iomem **)pcim_iomap_table(pdev);
388 for (i = 0; i < PCIM_IOMAP_MAX; i++)
389 if (tbl[i] == addr) {
395 EXPORT_SYMBOL(pcim_iounmap);
398 * pcim_iomap_regions - Request and iomap PCI BARs
399 * @pdev: PCI device to map IO resources for
400 * @mask: Mask of BARs to request and iomap
401 * @name: Name used when requesting regions
403 * Request and iomap regions specified by @mask.
405 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
407 void __iomem * const *iomap;
410 iomap = pcim_iomap_table(pdev);
414 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
417 if (!(mask & (1 << i)))
421 len = pci_resource_len(pdev, i);
425 rc = pci_request_region(pdev, i, name);
430 if (!pcim_iomap(pdev, i, 0))
437 pci_release_region(pdev, i);
440 if (!(mask & (1 << i)))
442 pcim_iounmap(pdev, iomap[i]);
443 pci_release_region(pdev, i);
448 EXPORT_SYMBOL(pcim_iomap_regions);
451 * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
452 * @pdev: PCI device to map IO resources for
453 * @mask: Mask of BARs to iomap
454 * @name: Name used when requesting regions
456 * Request all PCI BARs and iomap regions specified by @mask.
458 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
461 int request_mask = ((1 << 6) - 1) & ~mask;
464 rc = pci_request_selected_regions(pdev, request_mask, name);
468 rc = pcim_iomap_regions(pdev, mask, name);
470 pci_release_selected_regions(pdev, request_mask);
473 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
476 * pcim_iounmap_regions - Unmap and release PCI BARs
477 * @pdev: PCI device to map IO resources for
478 * @mask: Mask of BARs to unmap and release
480 * Unmap and release regions specified by @mask.
482 void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
484 void __iomem * const *iomap;
487 iomap = pcim_iomap_table(pdev);
491 for (i = 0; i < PCIM_IOMAP_MAX; i++) {
492 if (!(mask & (1 << i)))
495 pcim_iounmap(pdev, iomap[i]);
496 pci_release_region(pdev, i);
499 EXPORT_SYMBOL(pcim_iounmap_regions);
500 #endif /* CONFIG_PCI */