[linux-2.6-block.git] / arch / alpha / kernel / pci-sysfs.c

/*
 * arch/alpha/kernel/pci-sysfs.c
 *
 * Copyright (C) 2009 Ivan Kokshaysky
 *
 * Alpha PCI resource files.
 *
 * Loosely based on generic HAVE_PCI_MMAP implementation in
 * drivers/pci/pci-sysfs.c
 */

#include <linux/sched.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/pci.h>

static int hose_mmap_page_range(struct pci_controller *hose,
				struct vm_area_struct *vma,
				enum pci_mmap_state mmap_type, int sparse)
{
	unsigned long base;

	if (mmap_type == pci_mmap_mem)
		base = sparse ? hose->sparse_mem_base : hose->dense_mem_base;
	else
		base = sparse ? hose->sparse_io_base : hose->dense_io_base;

	vma->vm_pgoff += base >> PAGE_SHIFT;
	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;

	return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
				  vma->vm_end - vma->vm_start,
				  vma->vm_page_prot);
}

static int __pci_mmap_fits(struct pci_dev *pdev, int num,
			   struct vm_area_struct *vma, int sparse)
{
	unsigned long nr, start, size;
	int shift = sparse ? 5 : 0;

	nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
	start = vma->vm_pgoff;
	size = ((pci_resource_len(pdev, num) - 1) >> (PAGE_SHIFT - shift)) + 1;

	if (start < size && size - start >= nr)
		return 1;
	WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on %s BAR %d "
		"(size 0x%08lx)\n",
		current->comm, sparse ? " sparse" : "", start, start + nr,
		pci_name(pdev), num, size);
	return 0;
}

/**
 * pci_mmap_resource - map a PCI resource into user memory space
 * @kobj: kobject for mapping
 * @attr: struct bin_attribute for the file being mapped
 * @vma: struct vm_area_struct passed into the mmap
 * @sparse: address space type
 *
 * Use the bus mapping routines to map a PCI resource into userspace.
 */
static int pci_mmap_resource(struct kobject *kobj,
			     struct bin_attribute *attr,
			     struct vm_area_struct *vma, int sparse)
{
	struct pci_dev *pdev = to_pci_dev(container_of(kobj,
						       struct device, kobj));
	struct resource *res = attr->private;
	enum pci_mmap_state mmap_type;
	struct pci_bus_region bar;
	int i;

	for (i = 0; i < PCI_ROM_RESOURCE; i++)
		if (res == &pdev->resource[i])
			break;
	if (i >= PCI_ROM_RESOURCE)
		return -ENODEV;

	if (!__pci_mmap_fits(pdev, i, vma, sparse))
		return -EINVAL;

	if (iomem_is_exclusive(res->start))
		return -EINVAL;

	pcibios_resource_to_bus(pdev, &bar, res);
	vma->vm_pgoff += bar.start >> (PAGE_SHIFT - (sparse ? 5 : 0));
	mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;

	return hose_mmap_page_range(pdev->sysdata, vma, mmap_type, sparse);
}

static int pci_mmap_resource_sparse(struct file *filp, struct kobject *kobj,
				    struct bin_attribute *attr,
				    struct vm_area_struct *vma)
{
	return pci_mmap_resource(kobj, attr, vma, 1);
}

static int pci_mmap_resource_dense(struct file *filp, struct kobject *kobj,
				   struct bin_attribute *attr,
				   struct vm_area_struct *vma)
{
	return pci_mmap_resource(kobj, attr, vma, 0);
}

/**
 * pci_remove_resource_files - cleanup resource files
 * @dev: dev to cleanup
 *
 * If we created resource files for @dev, remove them from sysfs and
 * free their resources.
 */
void pci_remove_resource_files(struct pci_dev *pdev)
{
	int i;

	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
		struct bin_attribute *res_attr;

		res_attr = pdev->res_attr[i];
		if (res_attr) {
			sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
			kfree(res_attr);
		}

		res_attr = pdev->res_attr_wc[i];
		if (res_attr) {
			sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
			kfree(res_attr);
		}
	}
}

static int sparse_mem_mmap_fits(struct pci_dev *pdev, int num)
{
	struct pci_bus_region bar;
	struct pci_controller *hose = pdev->sysdata;
	long dense_offset;
	unsigned long sparse_size;

	pcibios_resource_to_bus(pdev, &bar, &pdev->resource[num]);

	/* All core logic chips have 4G sparse address space, except
	   CIA which has 16G (see xxx_SPARSE_MEM and xxx_DENSE_MEM
	   definitions in asm/core_xxx.h files). This corresponds
	   to 128M or 512M of the bus space. */
	dense_offset = (long)(hose->dense_mem_base - hose->sparse_mem_base);
	sparse_size = dense_offset >= 0x400000000UL ? 0x20000000 : 0x8000000;

	return bar.end < sparse_size;
}

static int pci_create_one_attr(struct pci_dev *pdev, int num, char *name,
			       char *suffix, struct bin_attribute *res_attr,
			       unsigned long sparse)
{
	size_t size = pci_resource_len(pdev, num);

	sprintf(name, "resource%d%s", num, suffix);
	res_attr->mmap = sparse ? pci_mmap_resource_sparse :
				  pci_mmap_resource_dense;
	res_attr->attr.name = name;
	res_attr->attr.mode = S_IRUSR | S_IWUSR;
	res_attr->size = sparse ? size << 5 : size;
	res_attr->private = &pdev->resource[num];
	return sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
}

static int pci_create_attr(struct pci_dev *pdev, int num)
{
	/* allocate attribute structure, piggyback attribute name */
	int retval, nlen1, nlen2 = 0, res_count = 1;
	unsigned long sparse_base, dense_base;
	struct bin_attribute *attr;
	struct pci_controller *hose = pdev->sysdata;
	char *suffix, *attr_name;

	suffix = "";	/* Assume bwx machine, normal resourceN files. */
	nlen1 = 10;

	if (pdev->resource[num].flags & IORESOURCE_MEM) {
		sparse_base = hose->sparse_mem_base;
		dense_base = hose->dense_mem_base;
		if (sparse_base && !sparse_mem_mmap_fits(pdev, num)) {
			sparse_base = 0;
			suffix = "_dense";
			nlen1 = 16;	/* resourceN_dense */
		}
	} else {
		sparse_base = hose->sparse_io_base;
		dense_base = hose->dense_io_base;
	}

	if (sparse_base) {
		suffix = "_sparse";
		nlen1 = 17;
		if (dense_base) {
			nlen2 = 16;	/* resourceN_dense */
			res_count = 2;
		}
	}

	attr = kzalloc(sizeof(*attr) * res_count + nlen1 + nlen2, GFP_ATOMIC);
	if (!attr)
		return -ENOMEM;

	/* Create bwx, sparse or single dense file */
	attr_name = (char *)(attr + res_count);
	pdev->res_attr[num] = attr;
	retval = pci_create_one_attr(pdev, num, attr_name, suffix, attr,
				     sparse_base);
	if (retval || res_count == 1)
		return retval;

	/* Create dense file */
	attr_name += nlen1;
	attr++;
	pdev->res_attr_wc[num] = attr;
	return pci_create_one_attr(pdev, num, attr_name, "_dense", attr, 0);
}

/**
 * pci_create_resource_files - create resource files in sysfs for @dev
 * @dev: dev in question
 *
 * Walk the resources in @dev creating files for each resource available.
 */
int pci_create_resource_files(struct pci_dev *pdev)
{
	int i;
	int retval;

	/* Expose the PCI resources from this device as files */
	for (i = 0; i < PCI_ROM_RESOURCE; i++) {

		/* skip empty resources */
		if (!pci_resource_len(pdev, i))
			continue;

		retval = pci_create_attr(pdev, i);
		if (retval) {
			pci_remove_resource_files(pdev);
			return retval;
		}
	}
	return 0;
}

/* Legacy I/O bus mapping stuff. */

static int __legacy_mmap_fits(struct pci_controller *hose,
			      struct vm_area_struct *vma,
			      unsigned long res_size, int sparse)
{
	unsigned long nr, start, size;

	nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
	start = vma->vm_pgoff;
	size = ((res_size - 1) >> PAGE_SHIFT) + 1;

	if (start < size && size - start >= nr)
		return 1;
	WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on hose %d "
		"(size 0x%08lx)\n",
		current->comm, sparse ? " sparse" : "", start, start + nr,
		hose->index, size);
	return 0;
}

static inline int has_sparse(struct pci_controller *hose,
			     enum pci_mmap_state mmap_type)
{
	unsigned long base;

	base = (mmap_type == pci_mmap_mem) ? hose->sparse_mem_base :
					     hose->sparse_io_base;

	return base != 0;
}

int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,
			       enum pci_mmap_state mmap_type)
{
	struct pci_controller *hose = bus->sysdata;
	int sparse = has_sparse(hose, mmap_type);
	unsigned long res_size;

	res_size = (mmap_type == pci_mmap_mem) ? bus->legacy_mem->size :
						 bus->legacy_io->size;
	if (!__legacy_mmap_fits(hose, vma, res_size, sparse))
		return -EINVAL;

	return hose_mmap_page_range(hose, vma, mmap_type, sparse);
}

/**
 * pci_adjust_legacy_attr - adjustment of legacy file attributes
 * @b: bus to create files under
 * @mmap_type: I/O port or memory
 *
 * Adjust file name and size for sparse mappings.
 */
void pci_adjust_legacy_attr(struct pci_bus *bus, enum pci_mmap_state mmap_type)
{
	struct pci_controller *hose = bus->sysdata;

	if (!has_sparse(hose, mmap_type))
		return;

	if (mmap_type == pci_mmap_mem) {
		bus->legacy_mem->attr.name = "legacy_mem_sparse";
		bus->legacy_mem->size <<= 5;
	} else {
		bus->legacy_io->attr.name = "legacy_io_sparse";
		bus->legacy_io->size <<= 5;
	}
	return;
}

/* Legacy I/O bus read/write functions */
int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
{
	struct pci_controller *hose = bus->sysdata;

	port += hose->io_space->start;

	switch(size) {
	case 1:
		*((u8 *)val) = inb(port);
		return 1;
	case 2:
		if (port & 1)
			return -EINVAL;
		*((u16 *)val) = inw(port);
		return 2;
	case 4:
		if (port & 3)
			return -EINVAL;
		*((u32 *)val) = inl(port);
		return 4;
	}
	return -EINVAL;
}

int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
{
	struct pci_controller *hose = bus->sysdata;

	port += hose->io_space->start;

	switch(size) {
	case 1:
		outb(port, val);
		return 1;
	case 2:
		if (port & 1)
			return -EINVAL;
		outw(port, val);
		return 2;
	case 4:
		if (port & 3)
			return -EINVAL;
		outl(port, val);
		return 4;
	}
	return -EINVAL;
}
Commit	Line	Data
10a0ef39 IK	1	/*
	2	* arch/alpha/kernel/pci-sysfs.c
	3	*
	4	* Copyright (C) 2009 Ivan Kokshaysky
	5	*
	6	* Alpha PCI resource files.
	7	*
	8	* Loosely based on generic HAVE_PCI_MMAP implementation in
	9	* drivers/pci/pci-sysfs.c
	10	*/
	11
	12	#include <linux/sched.h>
ce7cf073	13	#include <linux/stat.h>
5a0e3ad6	14	#include <linux/slab.h>
10a0ef39 IK	15	#include <linux/pci.h>
	16
	17	static int hose_mmap_page_range(struct pci_controller *hose,
	18	struct vm_area_struct *vma,
	19	enum pci_mmap_state mmap_type, int sparse)
	20	{
	21	unsigned long base;
	22
	23	if (mmap_type == pci_mmap_mem)
	24	base = sparse ? hose->sparse_mem_base : hose->dense_mem_base;
	25	else
	26	base = sparse ? hose->sparse_io_base : hose->dense_io_base;
	27
	28	vma->vm_pgoff += base >> PAGE_SHIFT;
314e51b9	29	vma->vm_flags \|= VM_IO \| VM_DONTEXPAND \| VM_DONTDUMP;
10a0ef39 IK	30
	31	return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
	32	vma->vm_end - vma->vm_start,
	33	vma->vm_page_prot);
	34	}
	35
	36	static int __pci_mmap_fits(struct pci_dev *pdev, int num,
	37	struct vm_area_struct *vma, int sparse)
	38	{
	39	unsigned long nr, start, size;
	40	int shift = sparse ? 5 : 0;
	41
	42	nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
	43	start = vma->vm_pgoff;
	44	size = ((pci_resource_len(pdev, num) - 1) >> (PAGE_SHIFT - shift)) + 1;
	45
	46	if (start < size && size - start >= nr)
	47	return 1;
	48	WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on %s BAR %d "
	49	"(size 0x%08lx)\n",
	50	current->comm, sparse ? " sparse" : "", start, start + nr,
	51	pci_name(pdev), num, size);
	52	return 0;
	53	}
	54
	55	/**
	56	* pci_mmap_resource - map a PCI resource into user memory space
	57	* @kobj: kobject for mapping
	58	* @attr: struct bin_attribute for the file being mapped
	59	* @vma: struct vm_area_struct passed into the mmap
	60	* @sparse: address space type
	61	*
	62	* Use the bus mapping routines to map a PCI resource into userspace.
	63	*/
5efa16ff	64	static int pci_mmap_resource(struct kobject *kobj,
2c3c8bea	65	struct bin_attribute *attr,
10a0ef39 IK	66	struct vm_area_struct *vma, int sparse)
	67	{
	68	struct pci_dev *pdev = to_pci_dev(container_of(kobj,
	69	struct device, kobj));
af96f8a3	70	struct resource *res = attr->private;
10a0ef39 IK	71	enum pci_mmap_state mmap_type;
	72	struct pci_bus_region bar;
	73	int i;
	74
	75	for (i = 0; i < PCI_ROM_RESOURCE; i++)
	76	if (res == &pdev->resource[i])
	77	break;
	78	if (i >= PCI_ROM_RESOURCE)
	79	return -ENODEV;
	80
	81	if (!__pci_mmap_fits(pdev, i, vma, sparse))
	82	return -EINVAL;
	83
	84	if (iomem_is_exclusive(res->start))
	85	return -EINVAL;
	86
	87	pcibios_resource_to_bus(pdev, &bar, res);
	88	vma->vm_pgoff += bar.start >> (PAGE_SHIFT - (sparse ? 5 : 0));
	89	mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
	90
	91	return hose_mmap_page_range(pdev->sysdata, vma, mmap_type, sparse);
	92	}
	93
2c3c8bea	94	static int pci_mmap_resource_sparse(struct file filp, struct kobject kobj,
10a0ef39 IK	95	struct bin_attribute *attr,
	96	struct vm_area_struct *vma)
	97	{
	98	return pci_mmap_resource(kobj, attr, vma, 1);
	99	}
	100
2c3c8bea	101	static int pci_mmap_resource_dense(struct file filp, struct kobject kobj,
10a0ef39 IK	102	struct bin_attribute *attr,
	103	struct vm_area_struct *vma)
	104	{
	105	return pci_mmap_resource(kobj, attr, vma, 0);
	106	}
	107
	108	/**
	109	* pci_remove_resource_files - cleanup resource files
	110	* @dev: dev to cleanup
	111	*
	112	* If we created resource files for @dev, remove them from sysfs and
	113	* free their resources.
	114	*/
	115	void pci_remove_resource_files(struct pci_dev *pdev)
	116	{
	117	int i;
	118
	119	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
	120	struct bin_attribute *res_attr;
	121
	122	res_attr = pdev->res_attr[i];
	123	if (res_attr) {
	124	sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
	125	kfree(res_attr);
	126	}
	127
	128	res_attr = pdev->res_attr_wc[i];
	129	if (res_attr) {
	130	sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
	131	kfree(res_attr);
	132	}
	133	}
	134	}
	135
	136	static int sparse_mem_mmap_fits(struct pci_dev *pdev, int num)
	137	{
	138	struct pci_bus_region bar;
	139	struct pci_controller *hose = pdev->sysdata;
	140	long dense_offset;
	141	unsigned long sparse_size;
	142
	143	pcibios_resource_to_bus(pdev, &bar, &pdev->resource[num]);
	144
	145	/* All core logic chips have 4G sparse address space, except
	146	CIA which has 16G (see xxx_SPARSE_MEM and xxx_DENSE_MEM
	147	definitions in asm/core_xxx.h files). This corresponds
	148	to 128M or 512M of the bus space. */
	149	dense_offset = (long)(hose->dense_mem_base - hose->sparse_mem_base);
	150	sparse_size = dense_offset >= 0x400000000UL ? 0x20000000 : 0x8000000;
	151
	152	return bar.end < sparse_size;
	153	}
	154
	155	static int pci_create_one_attr(struct pci_dev pdev, int num, char name,
	156	char suffix, struct bin_attribute res_attr,
	157	unsigned long sparse)
	158	{
	159	size_t size = pci_resource_len(pdev, num);
	160
	161	sprintf(name, "resource%d%s", num, suffix);
	162	res_attr->mmap = sparse ? pci_mmap_resource_sparse :
	163	pci_mmap_resource_dense;
	164	res_attr->attr.name = name;
	165	res_attr->attr.mode = S_IRUSR \| S_IWUSR;
166	res_attr->size = sparse ? size << 5 : size;
167	res_attr->private = &pdev->resource[num];
168	return sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
169	}
170
171	static int pci_create_attr(struct pci_dev *pdev, int num)
172	{
173	/* allocate attribute structure, piggyback attribute name */
174	int retval, nlen1, nlen2 = 0, res_count = 1;
175	unsigned long sparse_base, dense_base;
176	struct bin_attribute *attr;
177	struct pci_controller *hose = pdev->sysdata;
178	char suffix, attr_name;
179
180	suffix = ""; /* Assume bwx machine, normal resourceN files. */
181	nlen1 = 10;
182
183	if (pdev->resource[num].flags & IORESOURCE_MEM) {
184	sparse_base = hose->sparse_mem_base;
185	dense_base = hose->dense_mem_base;
186	if (sparse_base && !sparse_mem_mmap_fits(pdev, num)) {
187	sparse_base = 0;
188	suffix = "_dense";
189	nlen1 = 16; /* resourceN_dense */
190	}
191	} else {
192	sparse_base = hose->sparse_io_base;
193	dense_base = hose->dense_io_base;
194	}
195
196	if (sparse_base) {
197	suffix = "_sparse";
198	nlen1 = 17;
199	if (dense_base) {
200	nlen2 = 16; /* resourceN_dense */
201	res_count = 2;
202	}
203	}
204
205	attr = kzalloc(sizeof(attr) res_count + nlen1 + nlen2, GFP_ATOMIC);
206	if (!attr)
207	return -ENOMEM;
208
209	/* Create bwx, sparse or single dense file */
210	attr_name = (char *)(attr + res_count);
211	pdev->res_attr[num] = attr;
212	retval = pci_create_one_attr(pdev, num, attr_name, suffix, attr,
213	sparse_base);
214	if (retval \|\| res_count == 1)
215	return retval;
216
217	/* Create dense file */
218	attr_name += nlen1;
219	attr++;
220	pdev->res_attr_wc[num] = attr;
221	return pci_create_one_attr(pdev, num, attr_name, "_dense", attr, 0);
222	}
223
224	/**
225	* pci_create_resource_files - create resource files in sysfs for @dev
226	* @dev: dev in question
227	*
228	* Walk the resources in @dev creating files for each resource available.
229	*/
230	int pci_create_resource_files(struct pci_dev *pdev)
231	{
232	int i;
233	int retval;
234
235	/* Expose the PCI resources from this device as files */
236	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
237
238	/* skip empty resources */
239	if (!pci_resource_len(pdev, i))
240	continue;
241
242	retval = pci_create_attr(pdev, i);
243	if (retval) {
244	pci_remove_resource_files(pdev);
245	return retval;
246	}
247	}
248	return 0;
249	}
250
251	/* Legacy I/O bus mapping stuff. */
252
253	static int __legacy_mmap_fits(struct pci_controller *hose,
254	struct vm_area_struct *vma,
255	unsigned long res_size, int sparse)
256	{
257	unsigned long nr, start, size;
258
259	nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
260	start = vma->vm_pgoff;
261	size = ((res_size - 1) >> PAGE_SHIFT) + 1;
262
263	if (start < size && size - start >= nr)
264	return 1;
265	WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on hose %d "
266	"(size 0x%08lx)\n",
267	current->comm, sparse ? " sparse" : "", start, start + nr,
268	hose->index, size);
269	return 0;
270	}
271
272	static inline int has_sparse(struct pci_controller *hose,
273	enum pci_mmap_state mmap_type)
274	{
275	unsigned long base;
276
277	base = (mmap_type == pci_mmap_mem) ? hose->sparse_mem_base :
278	hose->sparse_io_base;
279
280	return base != 0;
281	}
282
283	int pci_mmap_legacy_page_range(struct pci_bus bus, struct vm_area_struct vma,
284	enum pci_mmap_state mmap_type)
285	{
286	struct pci_controller *hose = bus->sysdata;
287	int sparse = has_sparse(hose, mmap_type);
288	unsigned long res_size;
289
290	res_size = (mmap_type == pci_mmap_mem) ? bus->legacy_mem->size :
291	bus->legacy_io->size;
292	if (!__legacy_mmap_fits(hose, vma, res_size, sparse))
293	return -EINVAL;
294
295	return hose_mmap_page_range(hose, vma, mmap_type, sparse);
296	}
297
298	/**
299	* pci_adjust_legacy_attr - adjustment of legacy file attributes
300	* @b: bus to create files under
301	* @mmap_type: I/O port or memory
302	*
303	* Adjust file name and size for sparse mappings.
304	*/
305	void pci_adjust_legacy_attr(struct pci_bus *bus, enum pci_mmap_state mmap_type)
306	{
307	struct pci_controller *hose = bus->sysdata;
308
309	if (!has_sparse(hose, mmap_type))
310	return;
311
312	if (mmap_type == pci_mmap_mem) {
313	bus->legacy_mem->attr.name = "legacy_mem_sparse";
314	bus->legacy_mem->size <<= 5;
315	} else {
316	bus->legacy_io->attr.name = "legacy_io_sparse";
317	bus->legacy_io->size <<= 5;
318	}
319	return;
320	}
321
322	/* Legacy I/O bus read/write functions */
323	int pci_legacy_read(struct pci_bus bus, loff_t port, u32 val, size_t size)
324	{
325	struct pci_controller *hose = bus->sysdata;
326
327	port += hose->io_space->start;
328
329	switch(size) {
330	case 1:
331	((u8 )val) = inb(port);
332	return 1;
333	case 2:
334	if (port & 1)
335	return -EINVAL;
336	((u16 )val) = inw(port);
337	return 2;
338	case 4:
339	if (port & 3)
340	return -EINVAL;
341	((u32 )val) = inl(port);
342	return 4;
343	}
344	return -EINVAL;
345	}
346
347	int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
348	{
349	struct pci_controller *hose = bus->sysdata;
350
351	port += hose->io_space->start;
352
353	switch(size) {
354	case 1:
355	outb(port, val);
356	return 1;
357	case 2:
358	if (port & 1)
359	return -EINVAL;
360	outw(port, val);
361	return 2;
362	case 4:
363	if (port & 3)
364	return -EINVAL;
365	outl(port, val);
366	return 4;
367	}
368	return -EINVAL;
369	}