[mirror_ubuntu-artful-kernel.git] / lib / devres.c

#include <linux/pci.h>
#include <linux/io.h>
#include <linux/module.h>

static void devm_ioremap_release(struct device *dev, void *res)
{
	iounmap(*(void __iomem **)res);
}

static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
{
	return *(void **)res == match_data;
}

/**
 * devm_ioremap - Managed ioremap()
 * @dev: Generic device to remap IO address for
 * @offset: BUS offset to map
 * @size: Size of map
 *
 * Managed ioremap().  Map is automatically unmapped on driver detach.
 */
void __iomem *devm_ioremap(struct device *dev, unsigned long offset,
			   unsigned long size)
{
	void __iomem **ptr, *addr;

	ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
		return NULL;

	addr = ioremap(offset, size);
	if (addr) {
		*ptr = addr;
		devres_add(dev, ptr);
	} else
		devres_free(ptr);

	return addr;
}
EXPORT_SYMBOL(devm_ioremap);

/**
 * devm_ioremap_nocache - Managed ioremap_nocache()
 * @dev: Generic device to remap IO address for
 * @offset: BUS offset to map
 * @size: Size of map
 *
 * Managed ioremap_nocache().  Map is automatically unmapped on driver
 * detach.
 */
void __iomem *devm_ioremap_nocache(struct device *dev, unsigned long offset,
				   unsigned long size)
{
	void __iomem **ptr, *addr;

	ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
		return NULL;

	addr = ioremap_nocache(offset, size);
	if (addr) {
		*ptr = addr;
		devres_add(dev, ptr);
	} else
		devres_free(ptr);

	return addr;
}
EXPORT_SYMBOL(devm_ioremap_nocache);

/**
 * devm_iounmap - Managed iounmap()
 * @dev: Generic device to unmap for
 * @addr: Address to unmap
 *
 * Managed iounmap().  @addr must have been mapped using devm_ioremap*().
 */
void devm_iounmap(struct device *dev, void __iomem *addr)
{
	iounmap(addr);
	WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
			       (void *)addr));
}
EXPORT_SYMBOL(devm_iounmap);

#ifdef CONFIG_HAS_IOPORT
/*
 * Generic iomap devres
 */
static void devm_ioport_map_release(struct device *dev, void *res)
{
	ioport_unmap(*(void __iomem **)res);
}

static int devm_ioport_map_match(struct device *dev, void *res,
				 void *match_data)
{
	return *(void **)res == match_data;
}

/**
 * devm_ioport_map - Managed ioport_map()
 * @dev: Generic device to map ioport for
 * @port: Port to map
 * @nr: Number of ports to map
 *
 * Managed ioport_map().  Map is automatically unmapped on driver
 * detach.
 */
void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
			       unsigned int nr)
{
	void __iomem **ptr, *addr;

	ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
		return NULL;

	addr = ioport_map(port, nr);
	if (addr) {
		*ptr = addr;
		devres_add(dev, ptr);
	} else
		devres_free(ptr);

	return addr;
}
EXPORT_SYMBOL(devm_ioport_map);

/**
 * devm_ioport_unmap - Managed ioport_unmap()
 * @dev: Generic device to unmap for
 * @addr: Address to unmap
 *
 * Managed ioport_unmap().  @addr must have been mapped using
 * devm_ioport_map().
 */
void devm_ioport_unmap(struct device *dev, void __iomem *addr)
{
	ioport_unmap(addr);
	WARN_ON(devres_destroy(dev, devm_ioport_map_release,
			       devm_ioport_map_match, (void *)addr));
}
EXPORT_SYMBOL(devm_ioport_unmap);

#ifdef CONFIG_PCI
/*
 * PCI iomap devres
 */
#define PCIM_IOMAP_MAX	PCI_ROM_RESOURCE

struct pcim_iomap_devres {
	void __iomem *table[PCIM_IOMAP_MAX];
};

static void pcim_iomap_release(struct device *gendev, void *res)
{
	struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
	struct pcim_iomap_devres *this = res;
	int i;

	for (i = 0; i < PCIM_IOMAP_MAX; i++)
		if (this->table[i])
			pci_iounmap(dev, this->table[i]);
}

/**
 * pcim_iomap_table - access iomap allocation table
 * @pdev: PCI device to access iomap table for
 *
 * Access iomap allocation table for @dev.  If iomap table doesn't
 * exist and @pdev is managed, it will be allocated.  All iomaps
 * recorded in the iomap table are automatically unmapped on driver
 * detach.
 *
 * This function might sleep when the table is first allocated but can
 * be safely called without context and guaranteed to succed once
 * allocated.
 */
void __iomem * const * pcim_iomap_table(struct pci_dev *pdev)
{
	struct pcim_iomap_devres *dr, *new_dr;

	dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
	if (dr)
		return dr->table;

	new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
	if (!new_dr)
		return NULL;
	dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
	return dr->table;
}
EXPORT_SYMBOL(pcim_iomap_table);

/**
 * pcim_iomap - Managed pcim_iomap()
 * @pdev: PCI device to iomap for
 * @bar: BAR to iomap
 * @maxlen: Maximum length of iomap
 *
 * Managed pci_iomap().  Map is automatically unmapped on driver
 * detach.
 */
void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
{
	void __iomem **tbl;

	BUG_ON(bar >= PCIM_IOMAP_MAX);

	tbl = (void __iomem **)pcim_iomap_table(pdev);
	if (!tbl || tbl[bar])	/* duplicate mappings not allowed */
		return NULL;

	tbl[bar] = pci_iomap(pdev, bar, maxlen);
	return tbl[bar];
}
EXPORT_SYMBOL(pcim_iomap);

/**
 * pcim_iounmap - Managed pci_iounmap()
 * @pdev: PCI device to iounmap for
 * @addr: Address to unmap
 *
 * Managed pci_iounmap().  @addr must have been mapped using pcim_iomap().
 */
void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
{
	void __iomem **tbl;
	int i;

	pci_iounmap(pdev, addr);

	tbl = (void __iomem **)pcim_iomap_table(pdev);
	BUG_ON(!tbl);

	for (i = 0; i < PCIM_IOMAP_MAX; i++)
		if (tbl[i] == addr) {
			tbl[i] = NULL;
			return;
		}
	WARN_ON(1);
}
EXPORT_SYMBOL(pcim_iounmap);

/**
 * pcim_iomap_regions - Request and iomap PCI BARs
 * @pdev: PCI device to map IO resources for
 * @mask: Mask of BARs to request and iomap
 * @name: Name used when requesting regions
 *
 * Request and iomap regions specified by @mask.
 */
int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name)
{
	void __iomem * const *iomap;
	int i, rc;

	iomap = pcim_iomap_table(pdev);
	if (!iomap)
		return -ENOMEM;

	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
		unsigned long len;

		if (!(mask & (1 << i)))
			continue;

		rc = -EINVAL;
		len = pci_resource_len(pdev, i);
		if (!len)
			goto err_inval;

		rc = pci_request_region(pdev, i, name);
		if (rc)
			goto err_inval;

		rc = -ENOMEM;
		if (!pcim_iomap(pdev, i, 0))
			goto err_region;
	}

	return 0;

 err_region:
	pci_release_region(pdev, i);
 err_inval:
	while (--i >= 0) {
		if (!(mask & (1 << i)))
			continue;
		pcim_iounmap(pdev, iomap[i]);
		pci_release_region(pdev, i);
	}

	return rc;
}
EXPORT_SYMBOL(pcim_iomap_regions);

/**
 * pcim_iounmap_regions - Unmap and release PCI BARs
 * @pdev: PCI device to map IO resources for
 * @mask: Mask of BARs to unmap and release
 *
 * Unamp and release regions specified by @mask.
 */
void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask)
{
	void __iomem * const *iomap;
	int i;

	iomap = pcim_iomap_table(pdev);
	if (!iomap)
		return;

	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
		if (!(mask & (1 << i)))
			continue;

		pcim_iounmap(pdev, iomap[i]);
		pci_release_region(pdev, i);
	}
}
EXPORT_SYMBOL(pcim_iounmap_regions);
#endif
#endif
Commit	Line	Data
5ea81769 AV	1	#include <linux/pci.h>
	2	#include <linux/io.h>
	3	#include <linux/module.h>
	4
	5	static void devm_ioremap_release(struct device dev, void res)
	6	{
	7	iounmap((void __iomem *)res);
	8	}
	9
	10	static 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	*/
	23	void __iomem devm_ioremap(struct device dev, unsigned long 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	}
	41	EXPORT_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	*/
	52	void __iomem devm_ioremap_nocache(struct device dev, unsigned long 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	}
70	EXPORT_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	*/
79	void 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	}
85	EXPORT_SYMBOL(devm_iounmap);
86
87	#ifdef CONFIG_HAS_IOPORT
88	/*
89	* Generic iomap devres
90	*/
91	static void devm_ioport_map_release(struct device dev, void res)
92	{
93	ioport_unmap((void __iomem *)res);
94	}
95
96	static 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	*/
111	void __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	}
129	EXPORT_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	*/
139	void 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	}
145	EXPORT_SYMBOL(devm_ioport_unmap);
146
147	#ifdef CONFIG_PCI
148	/*
149	* PCI iomap devres
150	*/
151	#define PCIM_IOMAP_MAX PCI_ROM_RESOURCE
152
153	struct pcim_iomap_devres {
154	void __iomem *table[PCIM_IOMAP_MAX];
155	};
156
157	static 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	*/
181	void __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	}
195	EXPORT_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	*/
206	void __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	}
219	EXPORT_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	*/
228	void 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	}
245	EXPORT_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	*/
255	int 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)
fb4d64e7	277	goto err_inval;
5ea81769 AV	278
	279	rc = -ENOMEM;
	280	if (!pcim_iomap(pdev, i, 0))
fb4d64e7	281	goto err_region;
5ea81769 AV	282	}
	283
	284	return 0;
	285
5ea81769 AV	286	err_region:
	287	pci_release_region(pdev, i);
	288	err_inval:
	289	while (--i >= 0) {
fb4d64e7 FD	290	if (!(mask & (1 << i)))
fb4d64e7 FD	291	continue;
5ea81769 AV	292	pcim_iounmap(pdev, iomap[i]);
	293	pci_release_region(pdev, i);
	294	}
	295
	296	return rc;
	297	}
	298	EXPORT_SYMBOL(pcim_iomap_regions);
ec04b075 TH	299
	300	/**
	301	* pcim_iounmap_regions - Unmap and release PCI BARs
	302	* @pdev: PCI device to map IO resources for
	303	* @mask: Mask of BARs to unmap and release
	304	*
	305	* Unamp and release regions specified by @mask.
	306	*/
	307	void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask)
	308	{
	309	void __iomem * const *iomap;
	310	int i;
	311
	312	iomap = pcim_iomap_table(pdev);
	313	if (!iomap)
	314	return;
	315
	316	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
	317	if (!(mask & (1 << i)))
	318	continue;
	319
	320	pcim_iounmap(pdev, iomap[i]);
	321	pci_release_region(pdev, i);
	322	}
	323	}
	324	EXPORT_SYMBOL(pcim_iounmap_regions);
5ea81769 AV	325	#endif
5ea81769 AV	326	#endif