Root/lib/devres.c

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    iounmap(addr);
83    WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
84                   (void *)addr));
85}
86EXPORT_SYMBOL(devm_iounmap);
87
88#ifdef CONFIG_HAS_IOPORT
89/*
90 * Generic iomap devres
91 */
92static void devm_ioport_map_release(struct device *dev, void *res)
93{
94    ioport_unmap(*(void __iomem **)res);
95}
96
97static int devm_ioport_map_match(struct device *dev, void *res,
98                 void *match_data)
99{
100    return *(void **)res == match_data;
101}
102
103/**
104 * devm_ioport_map - Managed ioport_map()
105 * @dev: Generic device to map ioport for
106 * @port: Port to map
107 * @nr: Number of ports to map
108 *
109 * Managed ioport_map(). Map is automatically unmapped on driver
110 * detach.
111 */
112void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
113                   unsigned int nr)
114{
115    void __iomem **ptr, *addr;
116
117    ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
118    if (!ptr)
119        return NULL;
120
121    addr = ioport_map(port, nr);
122    if (addr) {
123        *ptr = addr;
124        devres_add(dev, ptr);
125    } else
126        devres_free(ptr);
127
128    return addr;
129}
130EXPORT_SYMBOL(devm_ioport_map);
131
132/**
133 * devm_ioport_unmap - Managed ioport_unmap()
134 * @dev: Generic device to unmap for
135 * @addr: Address to unmap
136 *
137 * Managed ioport_unmap(). @addr must have been mapped using
138 * devm_ioport_map().
139 */
140void devm_ioport_unmap(struct device *dev, void __iomem *addr)
141{
142    ioport_unmap(addr);
143    WARN_ON(devres_destroy(dev, devm_ioport_map_release,
144                   devm_ioport_map_match, (void *)addr));
145}
146EXPORT_SYMBOL(devm_ioport_unmap);
147
148#ifdef CONFIG_PCI
149/*
150 * PCI iomap devres
151 */
152#define PCIM_IOMAP_MAX PCI_ROM_RESOURCE
153
154struct pcim_iomap_devres {
155    void __iomem *table[PCIM_IOMAP_MAX];
156};
157
158static void pcim_iomap_release(struct device *gendev, void *res)
159{
160    struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
161    struct pcim_iomap_devres *this = res;
162    int i;
163
164    for (i = 0; i < PCIM_IOMAP_MAX; i++)
165        if (this->table[i])
166            pci_iounmap(dev, this->table[i]);
167}
168
169/**
170 * pcim_iomap_table - access iomap allocation table
171 * @pdev: PCI device to access iomap table for
172 *
173 * Access iomap allocation table for @dev. If iomap table doesn't
174 * exist and @pdev is managed, it will be allocated. All iomaps
175 * recorded in the iomap table are automatically unmapped on driver
176 * detach.
177 *
178 * This function might sleep when the table is first allocated but can
179 * be safely called without context and guaranteed to succed once
180 * allocated.
181 */
182void __iomem * const * pcim_iomap_table(struct pci_dev *pdev)
183{
184    struct pcim_iomap_devres *dr, *new_dr;
185
186    dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
187    if (dr)
188        return dr->table;
189
190    new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
191    if (!new_dr)
192        return NULL;
193    dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
194    return dr->table;
195}
196EXPORT_SYMBOL(pcim_iomap_table);
197
198/**
199 * pcim_iomap - Managed pcim_iomap()
200 * @pdev: PCI device to iomap for
201 * @bar: BAR to iomap
202 * @maxlen: Maximum length of iomap
203 *
204 * Managed pci_iomap(). Map is automatically unmapped on driver
205 * detach.
206 */
207void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
208{
209    void __iomem **tbl;
210
211    BUG_ON(bar >= PCIM_IOMAP_MAX);
212
213    tbl = (void __iomem **)pcim_iomap_table(pdev);
214    if (!tbl || tbl[bar]) /* duplicate mappings not allowed */
215        return NULL;
216
217    tbl[bar] = pci_iomap(pdev, bar, maxlen);
218    return tbl[bar];
219}
220EXPORT_SYMBOL(pcim_iomap);
221
222/**
223 * pcim_iounmap - Managed pci_iounmap()
224 * @pdev: PCI device to iounmap for
225 * @addr: Address to unmap
226 *
227 * Managed pci_iounmap(). @addr must have been mapped using pcim_iomap().
228 */
229void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
230{
231    void __iomem **tbl;
232    int i;
233
234    pci_iounmap(pdev, addr);
235
236    tbl = (void __iomem **)pcim_iomap_table(pdev);
237    BUG_ON(!tbl);
238
239    for (i = 0; i < PCIM_IOMAP_MAX; i++)
240        if (tbl[i] == addr) {
241            tbl[i] = NULL;
242            return;
243        }
244    WARN_ON(1);
245}
246EXPORT_SYMBOL(pcim_iounmap);
247
248/**
249 * pcim_iomap_regions - Request and iomap PCI BARs
250 * @pdev: PCI device to map IO resources for
251 * @mask: Mask of BARs to request and iomap
252 * @name: Name used when requesting regions
253 *
254 * Request and iomap regions specified by @mask.
255 */
256int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name)
257{
258    void __iomem * const *iomap;
259    int i, rc;
260
261    iomap = pcim_iomap_table(pdev);
262    if (!iomap)
263        return -ENOMEM;
264
265    for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
266        unsigned long len;
267
268        if (!(mask & (1 << i)))
269            continue;
270
271        rc = -EINVAL;
272        len = pci_resource_len(pdev, i);
273        if (!len)
274            goto err_inval;
275
276        rc = pci_request_region(pdev, i, name);
277        if (rc)
278            goto err_inval;
279
280        rc = -ENOMEM;
281        if (!pcim_iomap(pdev, i, 0))
282            goto err_region;
283    }
284
285    return 0;
286
287 err_region:
288    pci_release_region(pdev, i);
289 err_inval:
290    while (--i >= 0) {
291        if (!(mask & (1 << i)))
292            continue;
293        pcim_iounmap(pdev, iomap[i]);
294        pci_release_region(pdev, i);
295    }
296
297    return rc;
298}
299EXPORT_SYMBOL(pcim_iomap_regions);
300
301/**
302 * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
303 * @pdev: PCI device to map IO resources for
304 * @mask: Mask of BARs to iomap
305 * @name: Name used when requesting regions
306 *
307 * Request all PCI BARs and iomap regions specified by @mask.
308 */
309int pcim_iomap_regions_request_all(struct pci_dev *pdev, u16 mask,
310                   const char *name)
311{
312    int request_mask = ((1 << 6) - 1) & ~mask;
313    int rc;
314
315    rc = pci_request_selected_regions(pdev, request_mask, name);
316    if (rc)
317        return rc;
318
319    rc = pcim_iomap_regions(pdev, mask, name);
320    if (rc)
321        pci_release_selected_regions(pdev, request_mask);
322    return rc;
323}
324EXPORT_SYMBOL(pcim_iomap_regions_request_all);
325
326/**
327 * pcim_iounmap_regions - Unmap and release PCI BARs
328 * @pdev: PCI device to map IO resources for
329 * @mask: Mask of BARs to unmap and release
330 *
331 * Unmap and release regions specified by @mask.
332 */
333void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask)
334{
335    void __iomem * const *iomap;
336    int i;
337
338    iomap = pcim_iomap_table(pdev);
339    if (!iomap)
340        return;
341
342    for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
343        if (!(mask & (1 << i)))
344            continue;
345
346        pcim_iounmap(pdev, iomap[i]);
347        pci_release_region(pdev, i);
348    }
349}
350EXPORT_SYMBOL(pcim_iounmap_regions);
351#endif
352#endif
353

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