projects/linux·blob v2.6.33-rc7 · refs

351 lines · 7.7 KiB

1#include <linux/pci.h>
2#include <linux/io.h>
3#include <linux/module.h>
4
5void devm_ioremap_release(struct device *dev, void *res)
6{
7 iounmap(*(void __iomem **)res);
8}
9
10static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
11{
12 return *(void **)res == match_data;
13}
14
15/**
16 * devm_ioremap - Managed ioremap()
17 * @dev: Generic device to remap IO address for
18 * @offset: BUS offset to map
19 * @size: Size of map
20 *
21 * Managed ioremap(). Map is automatically unmapped on driver detach.
22 */
23void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
24 unsigned long size)
25{
26 void __iomem **ptr, *addr;
27
28 ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
29 if (!ptr)
30 return NULL;
31
32 addr = ioremap(offset, size);
33 if (addr) {
34 *ptr = addr;
35 devres_add(dev, ptr);
36 } else
37 devres_free(ptr);
38
39 return addr;
40}
41EXPORT_SYMBOL(devm_ioremap);
42
43/**
44 * devm_ioremap_nocache - Managed ioremap_nocache()
45 * @dev: Generic device to remap IO address for
46 * @offset: BUS offset to map
47 * @size: Size of map
48 *
49 * Managed ioremap_nocache(). Map is automatically unmapped on driver
50 * detach.
51 */
52void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
53 unsigned long size)
54{
55 void __iomem **ptr, *addr;
56
57 ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
58 if (!ptr)
59 return NULL;
60
61 addr = ioremap_nocache(offset, size);
62 if (addr) {
63 *ptr = addr;
64 devres_add(dev, ptr);
65 } else
66 devres_free(ptr);
67
68 return addr;
69}
70EXPORT_SYMBOL(devm_ioremap_nocache);
71
72/**
73 * devm_iounmap - Managed iounmap()
74 * @dev: Generic device to unmap for
75 * @addr: Address to unmap
76 *
77 * Managed iounmap(). @addr must have been mapped using devm_ioremap*().
78 */
79void devm_iounmap(struct device *dev, void __iomem *addr)
80{
81 iounmap(addr);
82 WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
83 (void *)addr));
84}
85EXPORT_SYMBOL(devm_iounmap);
86
87#ifdef CONFIG_HAS_IOPORT
88/*
89 * Generic iomap devres
90 */
91static void devm_ioport_map_release(struct device *dev, void *res)
92{
93 ioport_unmap(*(void __iomem **)res);
94}
95
96static int devm_ioport_map_match(struct device *dev, void *res,
97 void *match_data)
98{
99 return *(void **)res == match_data;
100}
101
102/**
103 * devm_ioport_map - Managed ioport_map()
104 * @dev: Generic device to map ioport for
105 * @port: Port to map
106 * @nr: Number of ports to map
107 *
108 * Managed ioport_map(). Map is automatically unmapped on driver
109 * detach.
110 */
111void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
112 unsigned int nr)
113{
114 void __iomem **ptr, *addr;
115
116 ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
117 if (!ptr)
118 return NULL;
119
120 addr = ioport_map(port, nr);
121 if (addr) {
122 *ptr = addr;
123 devres_add(dev, ptr);
124 } else
125 devres_free(ptr);
126
127 return addr;
128}
129EXPORT_SYMBOL(devm_ioport_map);
130
131/**
132 * devm_ioport_unmap - Managed ioport_unmap()
133 * @dev: Generic device to unmap for
134 * @addr: Address to unmap
135 *
136 * Managed ioport_unmap(). @addr must have been mapped using
137 * devm_ioport_map().
138 */
139void devm_ioport_unmap(struct device *dev, void __iomem *addr)
140{
141 ioport_unmap(addr);
142 WARN_ON(devres_destroy(dev, devm_ioport_map_release,
143 devm_ioport_map_match, (void *)addr));
144}
145EXPORT_SYMBOL(devm_ioport_unmap);
146
147#ifdef CONFIG_PCI
148/*
149 * PCI iomap devres
150 */
151#define PCIM_IOMAP_MAX PCI_ROM_RESOURCE
152
153struct pcim_iomap_devres {
154 void __iomem *table[PCIM_IOMAP_MAX];
155};
156
157static void pcim_iomap_release(struct device *gendev, void *res)
158{
159 struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
160 struct pcim_iomap_devres *this = res;
161 int i;
162
163 for (i = 0; i < PCIM_IOMAP_MAX; i++)
164 if (this->table[i])
165 pci_iounmap(dev, this->table[i]);
166}
167
168/**
169 * pcim_iomap_table - access iomap allocation table
170 * @pdev: PCI device to access iomap table for
171 *
172 * Access iomap allocation table for @dev. If iomap table doesn't
173 * exist and @pdev is managed, it will be allocated. All iomaps
174 * recorded in the iomap table are automatically unmapped on driver
175 * detach.
176 *
177 * This function might sleep when the table is first allocated but can
178 * be safely called without context and guaranteed to succed once
179 * allocated.
180 */
181void __iomem * const * pcim_iomap_table(struct pci_dev *pdev)
182{
183 struct pcim_iomap_devres *dr, *new_dr;
184
185 dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
186 if (dr)
187 return dr->table;
188
189 new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
190 if (!new_dr)
191 return NULL;
192 dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
193 return dr->table;
194}
195EXPORT_SYMBOL(pcim_iomap_table);
196
197/**
198 * pcim_iomap - Managed pcim_iomap()
199 * @pdev: PCI device to iomap for
200 * @bar: BAR to iomap
201 * @maxlen: Maximum length of iomap
202 *
203 * Managed pci_iomap(). Map is automatically unmapped on driver
204 * detach.
205 */
206void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
207{
208 void __iomem **tbl;
209
210 BUG_ON(bar >= PCIM_IOMAP_MAX);
211
212 tbl = (void __iomem **)pcim_iomap_table(pdev);
213 if (!tbl || tbl[bar]) /* duplicate mappings not allowed */
214 return NULL;
215
216 tbl[bar] = pci_iomap(pdev, bar, maxlen);
217 return tbl[bar];
218}
219EXPORT_SYMBOL(pcim_iomap);
220
221/**
222 * pcim_iounmap - Managed pci_iounmap()
223 * @pdev: PCI device to iounmap for
224 * @addr: Address to unmap
225 *
226 * Managed pci_iounmap(). @addr must have been mapped using pcim_iomap().
227 */
228void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
229{
230 void __iomem **tbl;
231 int i;
232
233 pci_iounmap(pdev, addr);
234
235 tbl = (void __iomem **)pcim_iomap_table(pdev);
236 BUG_ON(!tbl);
237
238 for (i = 0; i < PCIM_IOMAP_MAX; i++)
239 if (tbl[i] == addr) {
240 tbl[i] = NULL;
241 return;
242 }
243 WARN_ON(1);
244}
245EXPORT_SYMBOL(pcim_iounmap);
246
247/**
248 * pcim_iomap_regions - Request and iomap PCI BARs
249 * @pdev: PCI device to map IO resources for
250 * @mask: Mask of BARs to request and iomap
251 * @name: Name used when requesting regions
252 *
253 * Request and iomap regions specified by @mask.
254 */
255int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name)
256{
257 void __iomem * const *iomap;
258 int i, rc;
259
260 iomap = pcim_iomap_table(pdev);
261 if (!iomap)
262 return -ENOMEM;
263
264 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
265 unsigned long len;
266
267 if (!(mask & (1 << i)))
268 continue;
269
270 rc = -EINVAL;
271 len = pci_resource_len(pdev, i);
272 if (!len)
273 goto err_inval;
274
275 rc = pci_request_region(pdev, i, name);
276 if (rc)
277 goto err_inval;
278
279 rc = -ENOMEM;
280 if (!pcim_iomap(pdev, i, 0))
281 goto err_region;
282 }
283
284 return 0;
285
286 err_region:
287 pci_release_region(pdev, i);
288 err_inval:
289 while (--i >= 0) {
290 if (!(mask & (1 << i)))
291 continue;
292 pcim_iounmap(pdev, iomap[i]);
293 pci_release_region(pdev, i);
294 }
295
296 return rc;
297}
298EXPORT_SYMBOL(pcim_iomap_regions);
299
300/**
301 * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
302 * @pdev: PCI device to map IO resources for
303 * @mask: Mask of BARs to iomap
304 * @name: Name used when requesting regions
305 *
306 * Request all PCI BARs and iomap regions specified by @mask.
307 */
308int pcim_iomap_regions_request_all(struct pci_dev *pdev, u16 mask,
309 const char *name)
310{
311 int request_mask = ((1 << 6) - 1) & ~mask;
312 int rc;
313
314 rc = pci_request_selected_regions(pdev, request_mask, name);
315 if (rc)
316 return rc;
317
318 rc = pcim_iomap_regions(pdev, mask, name);
319 if (rc)
320 pci_release_selected_regions(pdev, request_mask);
321 return rc;
322}
323EXPORT_SYMBOL(pcim_iomap_regions_request_all);
324
325/**
326 * pcim_iounmap_regions - Unmap and release PCI BARs
327 * @pdev: PCI device to map IO resources for
328 * @mask: Mask of BARs to unmap and release
329 *
330 * Unamp and release regions specified by @mask.
331 */
332void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask)
333{
334 void __iomem * const *iomap;
335 int i;
336
337 iomap = pcim_iomap_table(pdev);
338 if (!iomap)
339 return;
340
341 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
342 if (!(mask & (1 << i)))
343 continue;
344
345 pcim_iounmap(pdev, iomap[i]);
346 pci_release_region(pdev, i);
347 }
348}
349EXPORT_SYMBOL(pcim_iounmap_regions);
350#endif
351#endif