Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[linux-2.6/luiz-linux-2.6.git] / lib / devres.c
blobf4a195a6efe4fccb7eb1c6d5fedda5d250eac355
1 #include <linux/err.h>
2 #include <linux/pci.h>
3 #include <linux/io.h>
4 #include <linux/gfp.h>
5 #include <linux/export.h>
7 void devm_ioremap_release(struct device *dev, void *res)
9 iounmap(*(void __iomem **)res);
12 static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
14 return *(void **)res == match_data;
17 /**
18 * devm_ioremap - Managed ioremap()
19 * @dev: Generic device to remap IO address for
20 * @offset: BUS offset to map
21 * @size: Size of map
23 * Managed ioremap(). Map is automatically unmapped on driver detach.
25 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
26 unsigned long size)
28 void __iomem **ptr, *addr;
30 ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
31 if (!ptr)
32 return NULL;
34 addr = ioremap(offset, size);
35 if (addr) {
36 *ptr = addr;
37 devres_add(dev, ptr);
38 } else
39 devres_free(ptr);
41 return addr;
43 EXPORT_SYMBOL(devm_ioremap);
45 /**
46 * devm_ioremap_nocache - Managed ioremap_nocache()
47 * @dev: Generic device to remap IO address for
48 * @offset: BUS offset to map
49 * @size: Size of map
51 * Managed ioremap_nocache(). Map is automatically unmapped on driver
52 * detach.
54 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
55 unsigned long size)
57 void __iomem **ptr, *addr;
59 ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
60 if (!ptr)
61 return NULL;
63 addr = ioremap_nocache(offset, size);
64 if (addr) {
65 *ptr = addr;
66 devres_add(dev, ptr);
67 } else
68 devres_free(ptr);
70 return addr;
72 EXPORT_SYMBOL(devm_ioremap_nocache);
74 /**
75 * devm_iounmap - Managed iounmap()
76 * @dev: Generic device to unmap for
77 * @addr: Address to unmap
79 * Managed iounmap(). @addr must have been mapped using devm_ioremap*().
81 void devm_iounmap(struct device *dev, void __iomem *addr)
83 WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
84 (__force void *)addr));
85 iounmap(addr);
87 EXPORT_SYMBOL(devm_iounmap);
89 /**
90 * devm_ioremap_resource() - check, request region, and ioremap resource
91 * @dev: generic device to handle the resource for
92 * @res: resource to be handled
94 * Checks that a resource is a valid memory region, requests the memory region
95 * and ioremaps it either as cacheable or as non-cacheable memory depending on
96 * the resource's flags. All operations are managed and will be undone on
97 * driver detach.
99 * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
100 * on failure. Usage example:
102 * res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
103 * base = devm_ioremap_resource(&pdev->dev, res);
104 * if (IS_ERR(base))
105 * return PTR_ERR(base);
107 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
109 resource_size_t size;
110 const char *name;
111 void __iomem *dest_ptr;
113 BUG_ON(!dev);
115 if (!res || resource_type(res) != IORESOURCE_MEM) {
116 dev_err(dev, "invalid resource\n");
117 return IOMEM_ERR_PTR(-EINVAL);
120 size = resource_size(res);
121 name = res->name ?: dev_name(dev);
123 if (!devm_request_mem_region(dev, res->start, size, name)) {
124 dev_err(dev, "can't request region for resource %pR\n", res);
125 return IOMEM_ERR_PTR(-EBUSY);
128 if (res->flags & IORESOURCE_CACHEABLE)
129 dest_ptr = devm_ioremap(dev, res->start, size);
130 else
131 dest_ptr = devm_ioremap_nocache(dev, res->start, size);
133 if (!dest_ptr) {
134 dev_err(dev, "ioremap failed for resource %pR\n", res);
135 devm_release_mem_region(dev, res->start, size);
136 dest_ptr = IOMEM_ERR_PTR(-ENOMEM);
139 return dest_ptr;
141 EXPORT_SYMBOL(devm_ioremap_resource);
143 #ifdef CONFIG_HAS_IOPORT_MAP
145 * Generic iomap devres
147 static void devm_ioport_map_release(struct device *dev, void *res)
149 ioport_unmap(*(void __iomem **)res);
152 static int devm_ioport_map_match(struct device *dev, void *res,
153 void *match_data)
155 return *(void **)res == match_data;
159 * devm_ioport_map - Managed ioport_map()
160 * @dev: Generic device to map ioport for
161 * @port: Port to map
162 * @nr: Number of ports to map
164 * Managed ioport_map(). Map is automatically unmapped on driver
165 * detach.
167 void __iomem *devm_ioport_map(struct device *dev, unsigned long port,
168 unsigned int nr)
170 void __iomem **ptr, *addr;
172 ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
173 if (!ptr)
174 return NULL;
176 addr = ioport_map(port, nr);
177 if (addr) {
178 *ptr = addr;
179 devres_add(dev, ptr);
180 } else
181 devres_free(ptr);
183 return addr;
185 EXPORT_SYMBOL(devm_ioport_map);
188 * devm_ioport_unmap - Managed ioport_unmap()
189 * @dev: Generic device to unmap for
190 * @addr: Address to unmap
192 * Managed ioport_unmap(). @addr must have been mapped using
193 * devm_ioport_map().
195 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
197 ioport_unmap(addr);
198 WARN_ON(devres_destroy(dev, devm_ioport_map_release,
199 devm_ioport_map_match, (__force void *)addr));
201 EXPORT_SYMBOL(devm_ioport_unmap);
202 #endif /* CONFIG_HAS_IOPORT_MAP */
204 #ifdef CONFIG_PCI
206 * PCI iomap devres
208 #define PCIM_IOMAP_MAX PCI_ROM_RESOURCE
210 struct pcim_iomap_devres {
211 void __iomem *table[PCIM_IOMAP_MAX];
214 static void pcim_iomap_release(struct device *gendev, void *res)
216 struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
217 struct pcim_iomap_devres *this = res;
218 int i;
220 for (i = 0; i < PCIM_IOMAP_MAX; i++)
221 if (this->table[i])
222 pci_iounmap(dev, this->table[i]);
226 * pcim_iomap_table - access iomap allocation table
227 * @pdev: PCI device to access iomap table for
229 * Access iomap allocation table for @dev. If iomap table doesn't
230 * exist and @pdev is managed, it will be allocated. All iomaps
231 * recorded in the iomap table are automatically unmapped on driver
232 * detach.
234 * This function might sleep when the table is first allocated but can
235 * be safely called without context and guaranteed to succed once
236 * allocated.
238 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
240 struct pcim_iomap_devres *dr, *new_dr;
242 dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
243 if (dr)
244 return dr->table;
246 new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
247 if (!new_dr)
248 return NULL;
249 dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
250 return dr->table;
252 EXPORT_SYMBOL(pcim_iomap_table);
255 * pcim_iomap - Managed pcim_iomap()
256 * @pdev: PCI device to iomap for
257 * @bar: BAR to iomap
258 * @maxlen: Maximum length of iomap
260 * Managed pci_iomap(). Map is automatically unmapped on driver
261 * detach.
263 void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
265 void __iomem **tbl;
267 BUG_ON(bar >= PCIM_IOMAP_MAX);
269 tbl = (void __iomem **)pcim_iomap_table(pdev);
270 if (!tbl || tbl[bar]) /* duplicate mappings not allowed */
271 return NULL;
273 tbl[bar] = pci_iomap(pdev, bar, maxlen);
274 return tbl[bar];
276 EXPORT_SYMBOL(pcim_iomap);
279 * pcim_iounmap - Managed pci_iounmap()
280 * @pdev: PCI device to iounmap for
281 * @addr: Address to unmap
283 * Managed pci_iounmap(). @addr must have been mapped using pcim_iomap().
285 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
287 void __iomem **tbl;
288 int i;
290 pci_iounmap(pdev, addr);
292 tbl = (void __iomem **)pcim_iomap_table(pdev);
293 BUG_ON(!tbl);
295 for (i = 0; i < PCIM_IOMAP_MAX; i++)
296 if (tbl[i] == addr) {
297 tbl[i] = NULL;
298 return;
300 WARN_ON(1);
302 EXPORT_SYMBOL(pcim_iounmap);
305 * pcim_iomap_regions - Request and iomap PCI BARs
306 * @pdev: PCI device to map IO resources for
307 * @mask: Mask of BARs to request and iomap
308 * @name: Name used when requesting regions
310 * Request and iomap regions specified by @mask.
312 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
314 void __iomem * const *iomap;
315 int i, rc;
317 iomap = pcim_iomap_table(pdev);
318 if (!iomap)
319 return -ENOMEM;
321 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
322 unsigned long len;
324 if (!(mask & (1 << i)))
325 continue;
327 rc = -EINVAL;
328 len = pci_resource_len(pdev, i);
329 if (!len)
330 goto err_inval;
332 rc = pci_request_region(pdev, i, name);
333 if (rc)
334 goto err_inval;
336 rc = -ENOMEM;
337 if (!pcim_iomap(pdev, i, 0))
338 goto err_region;
341 return 0;
343 err_region:
344 pci_release_region(pdev, i);
345 err_inval:
346 while (--i >= 0) {
347 if (!(mask & (1 << i)))
348 continue;
349 pcim_iounmap(pdev, iomap[i]);
350 pci_release_region(pdev, i);
353 return rc;
355 EXPORT_SYMBOL(pcim_iomap_regions);
358 * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
359 * @pdev: PCI device to map IO resources for
360 * @mask: Mask of BARs to iomap
361 * @name: Name used when requesting regions
363 * Request all PCI BARs and iomap regions specified by @mask.
365 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
366 const char *name)
368 int request_mask = ((1 << 6) - 1) & ~mask;
369 int rc;
371 rc = pci_request_selected_regions(pdev, request_mask, name);
372 if (rc)
373 return rc;
375 rc = pcim_iomap_regions(pdev, mask, name);
376 if (rc)
377 pci_release_selected_regions(pdev, request_mask);
378 return rc;
380 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
383 * pcim_iounmap_regions - Unmap and release PCI BARs
384 * @pdev: PCI device to map IO resources for
385 * @mask: Mask of BARs to unmap and release
387 * Unmap and release regions specified by @mask.
389 void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
391 void __iomem * const *iomap;
392 int i;
394 iomap = pcim_iomap_table(pdev);
395 if (!iomap)
396 return;
398 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
399 if (!(mask & (1 << i)))
400 continue;
402 pcim_iounmap(pdev, iomap[i]);
403 pci_release_region(pdev, i);
406 EXPORT_SYMBOL(pcim_iounmap_regions);
407 #endif /* CONFIG_PCI */