Root/lib/devres.c

Source at commit b386be689295730688885552666ea40b2e639b14 created 8 years 11 months ago.
By Maarten ter Huurne, Revert "MIPS: JZ4740: reset: Initialize hibernate wakeup counters."
1#include <linux/pci.h>
2#include <linux/io.h>
3#include <linux/gfp.h>
4#include <linux/module.h>
5
6void devm_ioremap_release(struct device *dev, void *res)
7{
8    iounmap(*(void __iomem **)res);
9}
10
11static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
12{
13    return *(void **)res == match_data;
14}
15
16/**
17 * devm_ioremap - Managed ioremap()
18 * @dev: Generic device to remap IO address for
19 * @offset: BUS offset to map
20 * @size: Size of map
21 *
22 * Managed ioremap(). Map is automatically unmapped on driver detach.
23 */
24void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
25               unsigned long size)
26{
27    void __iomem **ptr, *addr;
28
29    ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
30    if (!ptr)
31        return NULL;
32
33    addr = ioremap(offset, size);
34    if (addr) {
35        *ptr = addr;
36        devres_add(dev, ptr);
37    } else
38        devres_free(ptr);
39
40    return addr;
41}
42EXPORT_SYMBOL(devm_ioremap);
43
44/**
45 * devm_ioremap_nocache - Managed ioremap_nocache()
46 * @dev: Generic device to remap IO address for
47 * @offset: BUS offset to map
48 * @size: Size of map
49 *
50 * Managed ioremap_nocache(). Map is automatically unmapped on driver
51 * detach.
52 */
53void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
54                   unsigned long size)
55{
56    void __iomem **ptr, *addr;
57
58    ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
59    if (!ptr)
60        return NULL;
61
62    addr = ioremap_nocache(offset, size);
63    if (addr) {
64        *ptr = addr;
65        devres_add(dev, ptr);
66    } else
67        devres_free(ptr);
68
69    return addr;
70}
71EXPORT_SYMBOL(devm_ioremap_nocache);
72
73/**
74 * devm_iounmap - Managed iounmap()
75 * @dev: Generic device to unmap for
76 * @addr: Address to unmap
77 *
78 * Managed iounmap(). @addr must have been mapped using devm_ioremap*().
79 */
80void devm_iounmap(struct device *dev, void __iomem *addr)
81{
82    WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
83                   (void *)addr));
84    iounmap(addr);
85}
86EXPORT_SYMBOL(devm_iounmap);
87
88/**
89 * devm_request_and_ioremap() - Check, request region, and ioremap resource
90 * @dev: Generic device to handle the resource for
91 * @res: resource to be handled
92 *
93 * Takes all necessary steps to ioremap a mem resource. Uses managed device, so
94 * everything is undone on driver detach. Checks arguments, so you can feed
95 * it the result from e.g. platform_get_resource() directly. Returns the
96 * remapped pointer or NULL on error. Usage example:
97 *
98 * res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
99 * base = devm_request_and_ioremap(&pdev->dev, res);
100 * if (!base)
101 * return -EADDRNOTAVAIL;
102 */
103void __iomem *devm_request_and_ioremap(struct device *dev,
104            struct resource *res)
105{
106    resource_size_t size;
107    const char *name;
108    void __iomem *dest_ptr;
109
110    BUG_ON(!dev);
111
112    if (!res || resource_type(res) != IORESOURCE_MEM) {
113        dev_err(dev, "invalid resource\n");
114        return NULL;
115    }
116
117    size = resource_size(res);
118    name = res->name ?: dev_name(dev);
119
120    if (!devm_request_mem_region(dev, res->start, size, name)) {
121        dev_err(dev, "can't request region for resource %pR\n", res);
122        return NULL;
123    }
124
125    if (res->flags & IORESOURCE_CACHEABLE)
126        dest_ptr = devm_ioremap(dev, res->start, size);
127    else
128        dest_ptr = devm_ioremap_nocache(dev, res->start, size);
129
130    if (!dest_ptr) {
131        dev_err(dev, "ioremap failed for resource %pR\n", res);
132        devm_release_mem_region(dev, res->start, size);
133    }
134
135    return dest_ptr;
136}
137EXPORT_SYMBOL(devm_request_and_ioremap);
138
139#ifdef CONFIG_HAS_IOPORT
140/*
141 * Generic iomap devres
142 */
143static void devm_ioport_map_release(struct device *dev, void *res)
144{
145    ioport_unmap(*(void __iomem **)res);
146}
147
148static int devm_ioport_map_match(struct device *dev, void *res,
149                 void *match_data)
150{
151    return *(void **)res == match_data;
152}
153
154/**
155 * devm_ioport_map - Managed ioport_map()
156 * @dev: Generic device to map ioport for
157 * @port: Port to map
158 * @nr: Number of ports to map
159 *
160 * Managed ioport_map(). Map is automatically unmapped on driver
161 * detach.
162 */
163void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
164                   unsigned int nr)
165{
166    void __iomem **ptr, *addr;
167
168    ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
169    if (!ptr)
170        return NULL;
171
172    addr = ioport_map(port, nr);
173    if (addr) {
174        *ptr = addr;
175        devres_add(dev, ptr);
176    } else
177        devres_free(ptr);
178
179    return addr;
180}
181EXPORT_SYMBOL(devm_ioport_map);
182
183/**
184 * devm_ioport_unmap - Managed ioport_unmap()
185 * @dev: Generic device to unmap for
186 * @addr: Address to unmap
187 *
188 * Managed ioport_unmap(). @addr must have been mapped using
189 * devm_ioport_map().
190 */
191void devm_ioport_unmap(struct device *dev, void __iomem *addr)
192{
193    ioport_unmap(addr);
194    WARN_ON(devres_destroy(dev, devm_ioport_map_release,
195                   devm_ioport_map_match, (void *)addr));
196}
197EXPORT_SYMBOL(devm_ioport_unmap);
198
199#ifdef CONFIG_PCI
200/*
201 * PCI iomap devres
202 */
203#define PCIM_IOMAP_MAX PCI_ROM_RESOURCE
204
205struct pcim_iomap_devres {
206    void __iomem *table[PCIM_IOMAP_MAX];
207};
208
209static void pcim_iomap_release(struct device *gendev, void *res)
210{
211    struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
212    struct pcim_iomap_devres *this = res;
213    int i;
214
215    for (i = 0; i < PCIM_IOMAP_MAX; i++)
216        if (this->table[i])
217            pci_iounmap(dev, this->table[i]);
218}
219
220/**
221 * pcim_iomap_table - access iomap allocation table
222 * @pdev: PCI device to access iomap table for
223 *
224 * Access iomap allocation table for @dev. If iomap table doesn't
225 * exist and @pdev is managed, it will be allocated. All iomaps
226 * recorded in the iomap table are automatically unmapped on driver
227 * detach.
228 *
229 * This function might sleep when the table is first allocated but can
230 * be safely called without context and guaranteed to succed once
231 * allocated.
232 */
233void __iomem * const * pcim_iomap_table(struct pci_dev *pdev)
234{
235    struct pcim_iomap_devres *dr, *new_dr;
236
237    dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
238    if (dr)
239        return dr->table;
240
241    new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
242    if (!new_dr)
243        return NULL;
244    dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
245    return dr->table;
246}
247EXPORT_SYMBOL(pcim_iomap_table);
248
249/**
250 * pcim_iomap - Managed pcim_iomap()
251 * @pdev: PCI device to iomap for
252 * @bar: BAR to iomap
253 * @maxlen: Maximum length of iomap
254 *
255 * Managed pci_iomap(). Map is automatically unmapped on driver
256 * detach.
257 */
258void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
259{
260    void __iomem **tbl;
261
262    BUG_ON(bar >= PCIM_IOMAP_MAX);
263
264    tbl = (void __iomem **)pcim_iomap_table(pdev);
265    if (!tbl || tbl[bar]) /* duplicate mappings not allowed */
266        return NULL;
267
268    tbl[bar] = pci_iomap(pdev, bar, maxlen);
269    return tbl[bar];
270}
271EXPORT_SYMBOL(pcim_iomap);
272
273/**
274 * pcim_iounmap - Managed pci_iounmap()
275 * @pdev: PCI device to iounmap for
276 * @addr: Address to unmap
277 *
278 * Managed pci_iounmap(). @addr must have been mapped using pcim_iomap().
279 */
280void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
281{
282    void __iomem **tbl;
283    int i;
284
285    pci_iounmap(pdev, addr);
286
287    tbl = (void __iomem **)pcim_iomap_table(pdev);
288    BUG_ON(!tbl);
289
290    for (i = 0; i < PCIM_IOMAP_MAX; i++)
291        if (tbl[i] == addr) {
292            tbl[i] = NULL;
293            return;
294        }
295    WARN_ON(1);
296}
297EXPORT_SYMBOL(pcim_iounmap);
298
299/**
300 * pcim_iomap_regions - Request and iomap PCI BARs
301 * @pdev: PCI device to map IO resources for
302 * @mask: Mask of BARs to request and iomap
303 * @name: Name used when requesting regions
304 *
305 * Request and iomap regions specified by @mask.
306 */
307int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
308{
309    void __iomem * const *iomap;
310    int i, rc;
311
312    iomap = pcim_iomap_table(pdev);
313    if (!iomap)
314        return -ENOMEM;
315
316    for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
317        unsigned long len;
318
319        if (!(mask & (1 << i)))
320            continue;
321
322        rc = -EINVAL;
323        len = pci_resource_len(pdev, i);
324        if (!len)
325            goto err_inval;
326
327        rc = pci_request_region(pdev, i, name);
328        if (rc)
329            goto err_inval;
330
331        rc = -ENOMEM;
332        if (!pcim_iomap(pdev, i, 0))
333            goto err_region;
334    }
335
336    return 0;
337
338 err_region:
339    pci_release_region(pdev, i);
340 err_inval:
341    while (--i >= 0) {
342        if (!(mask & (1 << i)))
343            continue;
344        pcim_iounmap(pdev, iomap[i]);
345        pci_release_region(pdev, i);
346    }
347
348    return rc;
349}
350EXPORT_SYMBOL(pcim_iomap_regions);
351
352/**
353 * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
354 * @pdev: PCI device to map IO resources for
355 * @mask: Mask of BARs to iomap
356 * @name: Name used when requesting regions
357 *
358 * Request all PCI BARs and iomap regions specified by @mask.
359 */
360int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
361                   const char *name)
362{
363    int request_mask = ((1 << 6) - 1) & ~mask;
364    int rc;
365
366    rc = pci_request_selected_regions(pdev, request_mask, name);
367    if (rc)
368        return rc;
369
370    rc = pcim_iomap_regions(pdev, mask, name);
371    if (rc)
372        pci_release_selected_regions(pdev, request_mask);
373    return rc;
374}
375EXPORT_SYMBOL(pcim_iomap_regions_request_all);
376
377/**
378 * pcim_iounmap_regions - Unmap and release PCI BARs
379 * @pdev: PCI device to map IO resources for
380 * @mask: Mask of BARs to unmap and release
381 *
382 * Unmap and release regions specified by @mask.
383 */
384void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
385{
386    void __iomem * const *iomap;
387    int i;
388
389    iomap = pcim_iomap_table(pdev);
390    if (!iomap)
391        return;
392
393    for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
394        if (!(mask & (1 << i)))
395            continue;
396
397        pcim_iounmap(pdev, iomap[i]);
398        pci_release_region(pdev, i);
399    }
400}
401EXPORT_SYMBOL(pcim_iounmap_regions);
402#endif /* CONFIG_PCI */
403#endif /* CONFIG_HAS_IOPORT */
404

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