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;
125 if (!res || resource_type(res) != IORESOURCE_MEM) {
126 dev_err(dev, "invalid resource\n");
127 return IOMEM_ERR_PTR(-EINVAL);
130 size = resource_size(res);
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);
137 dest_ptr = __devm_ioremap(dev, res->start, size, type);
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);
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
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
156 * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
157 * on failure. Usage example:
159 * res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
160 * base = devm_ioremap_resource(&pdev->dev, res);
162 * return PTR_ERR(base);
164 void __iomem *devm_ioremap_resource(struct device *dev,
165 const struct resource *res)
167 return __devm_ioremap_resource(dev, res, DEVM_IOREMAP);
169 EXPORT_SYMBOL(devm_ioremap_resource);
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
177 * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
178 * on failure. Usage example:
180 void __iomem *devm_ioremap_resource_wc(struct device *dev,
181 const struct resource *res)
183 return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_WC);
187 * devm_of_iomap - Requests a resource and maps the memory mapped IO
188 * for a given device_node managed by a given device
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.
194 * This is to be used when a device requests/maps resources described
195 * by other device tree nodes (children or otherwise).
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:
204 * base = devm_of_iomap(&pdev->dev, node, 0, NULL);
206 * return PTR_ERR(base);
208 void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index,
209 resource_size_t *size)
213 if (of_address_to_resource(node, index, &res))
214 return IOMEM_ERR_PTR(-EINVAL);
216 *size = resource_size(&res);
217 return devm_ioremap_resource(dev, &res);
219 EXPORT_SYMBOL(devm_of_iomap);
221 #ifdef CONFIG_HAS_IOPORT_MAP
223 * Generic iomap devres
225 static void devm_ioport_map_release(struct device *dev, void *res)
227 ioport_unmap(*(void __iomem **)res);
230 static int devm_ioport_map_match(struct device *dev, void *res,
233 return *(void **)res == match_data;
237 * devm_ioport_map - Managed ioport_map()
238 * @dev: Generic device to map ioport for
240 * @nr: Number of ports to map
242 * Managed ioport_map(). Map is automatically unmapped on driver
245 void __iomem *devm_ioport_map(struct device *dev, unsigned long port,
248 void __iomem **ptr, *addr;
250 ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
254 addr = ioport_map(port, nr);
257 devres_add(dev, ptr);
263 EXPORT_SYMBOL(devm_ioport_map);
266 * devm_ioport_unmap - Managed ioport_unmap()
267 * @dev: Generic device to unmap for
268 * @addr: Address to unmap
270 * Managed ioport_unmap(). @addr must have been mapped using
273 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
276 WARN_ON(devres_destroy(dev, devm_ioport_map_release,
277 devm_ioport_map_match, (__force void *)addr));
279 EXPORT_SYMBOL(devm_ioport_unmap);
280 #endif /* CONFIG_HAS_IOPORT_MAP */
286 #define PCIM_IOMAP_MAX PCI_STD_NUM_BARS
288 struct pcim_iomap_devres {
289 void __iomem *table[PCIM_IOMAP_MAX];
292 static void pcim_iomap_release(struct device *gendev, void *res)
294 struct pci_dev *dev = to_pci_dev(gendev);
295 struct pcim_iomap_devres *this = res;
298 for (i = 0; i < PCIM_IOMAP_MAX; i++)
300 pci_iounmap(dev, this->table[i]);
304 * pcim_iomap_table - access iomap allocation table
305 * @pdev: PCI device to access iomap table for
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
312 * This function might sleep when the table is first allocated but can
313 * be safely called without context and guaranteed to succed once
316 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
318 struct pcim_iomap_devres *dr, *new_dr;
320 dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
324 new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
327 dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
330 EXPORT_SYMBOL(pcim_iomap_table);
333 * pcim_iomap - Managed pcim_iomap()
334 * @pdev: PCI device to iomap for
336 * @maxlen: Maximum length of iomap
338 * Managed pci_iomap(). Map is automatically unmapped on driver
341 void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
345 BUG_ON(bar >= PCIM_IOMAP_MAX);
347 tbl = (void __iomem **)pcim_iomap_table(pdev);
348 if (!tbl || tbl[bar]) /* duplicate mappings not allowed */
351 tbl[bar] = pci_iomap(pdev, bar, maxlen);
354 EXPORT_SYMBOL(pcim_iomap);
357 * pcim_iounmap - Managed pci_iounmap()
358 * @pdev: PCI device to iounmap for
359 * @addr: Address to unmap
361 * Managed pci_iounmap(). @addr must have been mapped using pcim_iomap().
363 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
368 pci_iounmap(pdev, addr);
370 tbl = (void __iomem **)pcim_iomap_table(pdev);
373 for (i = 0; i < PCIM_IOMAP_MAX; i++)
374 if (tbl[i] == addr) {
380 EXPORT_SYMBOL(pcim_iounmap);
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
388 * Request and iomap regions specified by @mask.
390 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
392 void __iomem * const *iomap;
395 iomap = pcim_iomap_table(pdev);
399 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
402 if (!(mask & (1 << i)))
406 len = pci_resource_len(pdev, i);
410 rc = pci_request_region(pdev, i, name);
415 if (!pcim_iomap(pdev, i, 0))
422 pci_release_region(pdev, i);
425 if (!(mask & (1 << i)))
427 pcim_iounmap(pdev, iomap[i]);
428 pci_release_region(pdev, i);
433 EXPORT_SYMBOL(pcim_iomap_regions);
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
441 * Request all PCI BARs and iomap regions specified by @mask.
443 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
446 int request_mask = ((1 << 6) - 1) & ~mask;
449 rc = pci_request_selected_regions(pdev, request_mask, name);
453 rc = pcim_iomap_regions(pdev, mask, name);
455 pci_release_selected_regions(pdev, request_mask);
458 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
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
465 * Unmap and release regions specified by @mask.
467 void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
469 void __iomem * const *iomap;
472 iomap = pcim_iomap_table(pdev);
476 for (i = 0; i < PCIM_IOMAP_MAX; i++) {
477 if (!(mask & (1 << i)))
480 pcim_iounmap(pdev, iomap[i]);
481 pci_release_region(pdev, i);
484 EXPORT_SYMBOL(pcim_iounmap_regions);
485 #endif /* CONFIG_PCI */