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_nocache(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_nocache - Managed ioremap_nocache()
73 * @dev: Generic device to remap IO address for
74 * @offset: Resource address to map
77 * Managed ioremap_nocache(). Map is automatically unmapped on driver
80 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
83 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_NC);
85 EXPORT_SYMBOL(devm_ioremap_nocache);
88 * devm_ioremap_wc - Managed ioremap_wc()
89 * @dev: Generic device to remap IO address for
90 * @offset: Resource address to map
93 * Managed ioremap_wc(). Map is automatically unmapped on driver detach.
95 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
98 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_WC);
100 EXPORT_SYMBOL(devm_ioremap_wc);
103 * devm_iounmap - Managed iounmap()
104 * @dev: Generic device to unmap for
105 * @addr: Address to unmap
107 * Managed iounmap(). @addr must have been mapped using devm_ioremap*().
109 void devm_iounmap(struct device *dev, void __iomem *addr)
111 WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
112 (__force void *)addr));
115 EXPORT_SYMBOL(devm_iounmap);
118 * devm_ioremap_resource() - check, request region, and ioremap resource
119 * @dev: generic device to handle the resource for
120 * @res: resource to be handled
122 * Checks that a resource is a valid memory region, requests the memory
123 * region and ioremaps it. All operations are managed and will be undone
126 * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
127 * on failure. Usage example:
129 * res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
130 * base = devm_ioremap_resource(&pdev->dev, res);
132 * return PTR_ERR(base);
134 void __iomem *devm_ioremap_resource(struct device *dev,
135 const struct resource *res)
137 resource_size_t size;
138 void __iomem *dest_ptr;
142 if (!res || resource_type(res) != IORESOURCE_MEM) {
143 dev_err(dev, "invalid resource\n");
144 return IOMEM_ERR_PTR(-EINVAL);
147 size = resource_size(res);
149 if (!devm_request_mem_region(dev, res->start, size, dev_name(dev))) {
150 dev_err(dev, "can't request region for resource %pR\n", res);
151 return IOMEM_ERR_PTR(-EBUSY);
154 dest_ptr = devm_ioremap(dev, res->start, size);
156 dev_err(dev, "ioremap failed for resource %pR\n", res);
157 devm_release_mem_region(dev, res->start, size);
158 dest_ptr = IOMEM_ERR_PTR(-ENOMEM);
163 EXPORT_SYMBOL(devm_ioremap_resource);
166 * devm_of_iomap - Requests a resource and maps the memory mapped IO
167 * for a given device_node managed by a given device
169 * Checks that a resource is a valid memory region, requests the memory
170 * region and ioremaps it. All operations are managed and will be undone
171 * on driver detach of the device.
173 * This is to be used when a device requests/maps resources described
174 * by other device tree nodes (children or otherwise).
176 * @dev: The device "managing" the resource
177 * @node: The device-tree node where the resource resides
178 * @index: index of the MMIO range in the "reg" property
179 * @size: Returns the size of the resource (pass NULL if not needed)
180 * Returns a pointer to the requested and mapped memory or an ERR_PTR() encoded
181 * error code on failure. Usage example:
183 * base = devm_of_iomap(&pdev->dev, node, 0, NULL);
185 * return PTR_ERR(base);
187 void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index,
188 resource_size_t *size)
192 if (of_address_to_resource(node, index, &res))
193 return IOMEM_ERR_PTR(-EINVAL);
195 *size = resource_size(&res);
196 return devm_ioremap_resource(dev, &res);
198 EXPORT_SYMBOL(devm_of_iomap);
200 #ifdef CONFIG_HAS_IOPORT_MAP
202 * Generic iomap devres
204 static void devm_ioport_map_release(struct device *dev, void *res)
206 ioport_unmap(*(void __iomem **)res);
209 static int devm_ioport_map_match(struct device *dev, void *res,
212 return *(void **)res == match_data;
216 * devm_ioport_map - Managed ioport_map()
217 * @dev: Generic device to map ioport for
219 * @nr: Number of ports to map
221 * Managed ioport_map(). Map is automatically unmapped on driver
224 void __iomem *devm_ioport_map(struct device *dev, unsigned long port,
227 void __iomem **ptr, *addr;
229 ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
233 addr = ioport_map(port, nr);
236 devres_add(dev, ptr);
242 EXPORT_SYMBOL(devm_ioport_map);
245 * devm_ioport_unmap - Managed ioport_unmap()
246 * @dev: Generic device to unmap for
247 * @addr: Address to unmap
249 * Managed ioport_unmap(). @addr must have been mapped using
252 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
255 WARN_ON(devres_destroy(dev, devm_ioport_map_release,
256 devm_ioport_map_match, (__force void *)addr));
258 EXPORT_SYMBOL(devm_ioport_unmap);
259 #endif /* CONFIG_HAS_IOPORT_MAP */
265 #define PCIM_IOMAP_MAX PCI_ROM_RESOURCE
267 struct pcim_iomap_devres {
268 void __iomem *table[PCIM_IOMAP_MAX];
271 static void pcim_iomap_release(struct device *gendev, void *res)
273 struct pci_dev *dev = to_pci_dev(gendev);
274 struct pcim_iomap_devres *this = res;
277 for (i = 0; i < PCIM_IOMAP_MAX; i++)
279 pci_iounmap(dev, this->table[i]);
283 * pcim_iomap_table - access iomap allocation table
284 * @pdev: PCI device to access iomap table for
286 * Access iomap allocation table for @dev. If iomap table doesn't
287 * exist and @pdev is managed, it will be allocated. All iomaps
288 * recorded in the iomap table are automatically unmapped on driver
291 * This function might sleep when the table is first allocated but can
292 * be safely called without context and guaranteed to succed once
295 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
297 struct pcim_iomap_devres *dr, *new_dr;
299 dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
303 new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
306 dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
309 EXPORT_SYMBOL(pcim_iomap_table);
312 * pcim_iomap - Managed pcim_iomap()
313 * @pdev: PCI device to iomap for
315 * @maxlen: Maximum length of iomap
317 * Managed pci_iomap(). Map is automatically unmapped on driver
320 void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
324 BUG_ON(bar >= PCIM_IOMAP_MAX);
326 tbl = (void __iomem **)pcim_iomap_table(pdev);
327 if (!tbl || tbl[bar]) /* duplicate mappings not allowed */
330 tbl[bar] = pci_iomap(pdev, bar, maxlen);
333 EXPORT_SYMBOL(pcim_iomap);
336 * pcim_iounmap - Managed pci_iounmap()
337 * @pdev: PCI device to iounmap for
338 * @addr: Address to unmap
340 * Managed pci_iounmap(). @addr must have been mapped using pcim_iomap().
342 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
347 pci_iounmap(pdev, addr);
349 tbl = (void __iomem **)pcim_iomap_table(pdev);
352 for (i = 0; i < PCIM_IOMAP_MAX; i++)
353 if (tbl[i] == addr) {
359 EXPORT_SYMBOL(pcim_iounmap);
362 * pcim_iomap_regions - Request and iomap PCI BARs
363 * @pdev: PCI device to map IO resources for
364 * @mask: Mask of BARs to request and iomap
365 * @name: Name used when requesting regions
367 * Request and iomap regions specified by @mask.
369 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
371 void __iomem * const *iomap;
374 iomap = pcim_iomap_table(pdev);
378 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
381 if (!(mask & (1 << i)))
385 len = pci_resource_len(pdev, i);
389 rc = pci_request_region(pdev, i, name);
394 if (!pcim_iomap(pdev, i, 0))
401 pci_release_region(pdev, i);
404 if (!(mask & (1 << i)))
406 pcim_iounmap(pdev, iomap[i]);
407 pci_release_region(pdev, i);
412 EXPORT_SYMBOL(pcim_iomap_regions);
415 * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
416 * @pdev: PCI device to map IO resources for
417 * @mask: Mask of BARs to iomap
418 * @name: Name used when requesting regions
420 * Request all PCI BARs and iomap regions specified by @mask.
422 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
425 int request_mask = ((1 << 6) - 1) & ~mask;
428 rc = pci_request_selected_regions(pdev, request_mask, name);
432 rc = pcim_iomap_regions(pdev, mask, name);
434 pci_release_selected_regions(pdev, request_mask);
437 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
440 * pcim_iounmap_regions - Unmap and release PCI BARs
441 * @pdev: PCI device to map IO resources for
442 * @mask: Mask of BARs to unmap and release
444 * Unmap and release regions specified by @mask.
446 void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
448 void __iomem * const *iomap;
451 iomap = pcim_iomap_table(pdev);
455 for (i = 0; i < PCIM_IOMAP_MAX; i++) {
456 if (!(mask & (1 << i)))
459 pcim_iounmap(pdev, iomap[i]);
460 pci_release_region(pdev, i);
463 EXPORT_SYMBOL(pcim_iounmap_regions);
464 #endif /* CONFIG_PCI */