[net-next-2.6.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/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_RESERVED);

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