[deliverable/linux.git] / arch / powerpc / kernel / ibmebus.c

/*
 * IBM PowerPC IBM eBus Infrastructure Support.
 *
 * Copyright (c) 2005 IBM Corporation
 *  Joachim Fenkes <fenkes@de.ibm.com>
 *  Heiko J Schick <schickhj@de.ibm.com>
 *
 * All rights reserved.
 *
 * This source code is distributed under a dual license of GPL v2.0 and OpenIB
 * BSD.
 *
 * OpenIB BSD License
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials
 * provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/init.h>
#include <linux/console.h>
#include <linux/kobject.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <asm/ibmebus.h>
#include <asm/abs_addr.h>

static struct device ibmebus_bus_device = { /* fake "parent" device */
	.bus_id = "ibmebus",
};

struct bus_type ibmebus_bus_type;

static void *ibmebus_alloc_coherent(struct device *dev,
				    size_t size,
				    dma_addr_t *dma_handle,
				    gfp_t flag)
{
	void *mem;

	mem = kmalloc(size, flag);
	*dma_handle = (dma_addr_t)mem;

	return mem;
}

static void ibmebus_free_coherent(struct device *dev,
				  size_t size, void *vaddr,
				  dma_addr_t dma_handle)
{
	kfree(vaddr);
}

static dma_addr_t ibmebus_map_single(struct device *dev,
				     void *ptr,
				     size_t size,
				     enum dma_data_direction direction)
{
	return (dma_addr_t)(ptr);
}

static void ibmebus_unmap_single(struct device *dev,
				 dma_addr_t dma_addr,
				 size_t size,
				 enum dma_data_direction direction)
{
	return;
}

static int ibmebus_map_sg(struct device *dev,
			  struct scatterlist *sg,
			  int nents, enum dma_data_direction direction)
{
	int i;

	for (i = 0; i < nents; i++) {
		sg[i].dma_address = (dma_addr_t)page_address(sg[i].page)
			+ sg[i].offset;
		sg[i].dma_length = sg[i].length;
	}

	return nents;
}

static void ibmebus_unmap_sg(struct device *dev,
			     struct scatterlist *sg,
			     int nents, enum dma_data_direction direction)
{
	return;
}

static int ibmebus_dma_supported(struct device *dev, u64 mask)
{
	return 1;
}

static struct dma_mapping_ops ibmebus_dma_ops = {
	.alloc_coherent = ibmebus_alloc_coherent,
	.free_coherent  = ibmebus_free_coherent,
	.map_single     = ibmebus_map_single,
	.unmap_single   = ibmebus_unmap_single,
	.map_sg         = ibmebus_map_sg,
	.unmap_sg       = ibmebus_unmap_sg,
	.dma_supported  = ibmebus_dma_supported,
};

static int ibmebus_bus_probe(struct device *dev)
{
	struct ibmebus_dev *ibmebusdev    = to_ibmebus_dev(dev);
	struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
	const struct of_device_id *id;
	int error = -ENODEV;

	if (!ibmebusdrv->probe)
		return error;

	id = of_match_device(ibmebusdrv->id_table, &ibmebusdev->ofdev);
	if (id) {
		error = ibmebusdrv->probe(ibmebusdev, id);
	}

	return error;
}

static int ibmebus_bus_remove(struct device *dev)
{
	struct ibmebus_dev *ibmebusdev    = to_ibmebus_dev(dev);
	struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);

	if (ibmebusdrv->remove) {
		return ibmebusdrv->remove(ibmebusdev);
	}

	return 0;
}

static void __devinit ibmebus_dev_release(struct device *dev)
{
	of_node_put(to_ibmebus_dev(dev)->ofdev.node);
	kfree(to_ibmebus_dev(dev));
}

static int __devinit ibmebus_register_device_common(
	struct ibmebus_dev *dev, const char *name)
{
	int err = 0;

	dev->ofdev.dev.parent  = &ibmebus_bus_device;
	dev->ofdev.dev.bus     = &ibmebus_bus_type;
	dev->ofdev.dev.release = ibmebus_dev_release;

	dev->ofdev.dev.archdata.of_node = dev->ofdev.node;
	dev->ofdev.dev.archdata.dma_ops = &ibmebus_dma_ops;
	dev->ofdev.dev.archdata.numa_node = of_node_to_nid(dev->ofdev.node);

	/* An ibmebusdev is based on a of_device. We have to change the
	 * bus type to use our own DMA mapping operations.
	 */
	if ((err = of_device_register(&dev->ofdev)) != 0) {
		printk(KERN_ERR "%s: failed to register device (%d).\n",
		       __FUNCTION__, err);
		return -ENODEV;
	}

	return 0;
}

static struct ibmebus_dev* __devinit ibmebus_register_device_node(
	struct device_node *dn)
{
	struct ibmebus_dev *dev;
	int i, len, bus_len;

	dev = kzalloc(sizeof(struct ibmebus_dev), GFP_KERNEL);
	if (!dev)
		return ERR_PTR(-ENOMEM);

	dev->ofdev.node = of_node_get(dn);

	len = strlen(dn->full_name + 1);
	bus_len = min(len, BUS_ID_SIZE - 1);
	memcpy(dev->ofdev.dev.bus_id, dn->full_name + 1
	       + (len - bus_len), bus_len);
	for (i = 0; i < bus_len; i++)
		if (dev->ofdev.dev.bus_id[i] == '/')
			dev->ofdev.dev.bus_id[i] = '_';

	/* Register with generic device framework. */
	if (ibmebus_register_device_common(dev, dn->name) != 0) {
		kfree(dev);
		return ERR_PTR(-ENODEV);
	}

	return dev;
}

static void ibmebus_probe_of_nodes(char* name)
{
	struct device_node *dn = NULL;

	while ((dn = of_find_node_by_name(dn, name))) {
		if (IS_ERR(ibmebus_register_device_node(dn))) {
			of_node_put(dn);
			return;
		}
	}

	of_node_put(dn);

	return;
}

static void ibmebus_add_devices_by_id(struct of_device_id *idt)
{
	while (strlen(idt->name) > 0) {
		ibmebus_probe_of_nodes(idt->name);
		idt++;
	}

	return;
}

static int ibmebus_match_name(struct device *dev, void *data)
{
	const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
	const char *name;

	name = of_get_property(ebus_dev->ofdev.node, "name", NULL);

	if (name && (strcmp(data, name) == 0))
		return 1;

	return 0;
}

static int ibmebus_unregister_device(struct device *dev)
{
	of_device_unregister(to_of_device(dev));

	return 0;
}

static void ibmebus_remove_devices_by_id(struct of_device_id *idt)
{
	struct device *dev;

	while (strlen(idt->name) > 0) {
		while ((dev = bus_find_device(&ibmebus_bus_type, NULL,
					      (void*)idt->name,
					      ibmebus_match_name))) {
			ibmebus_unregister_device(dev);
		}
		idt++;
	}

	return;
}

int ibmebus_register_driver(struct ibmebus_driver *drv)
{
	int err = 0;

	drv->driver.name   = drv->name;
	drv->driver.bus    = &ibmebus_bus_type;
	drv->driver.probe  = ibmebus_bus_probe;
	drv->driver.remove = ibmebus_bus_remove;

	if ((err = driver_register(&drv->driver) != 0))
		return err;

	/* remove all supported devices first, in case someone
	 * probed them manually before registering the driver */
	ibmebus_remove_devices_by_id(drv->id_table);
	ibmebus_add_devices_by_id(drv->id_table);

	return 0;
}
EXPORT_SYMBOL(ibmebus_register_driver);

void ibmebus_unregister_driver(struct ibmebus_driver *drv)
{
	driver_unregister(&drv->driver);
	ibmebus_remove_devices_by_id(drv->id_table);
}
EXPORT_SYMBOL(ibmebus_unregister_driver);

int ibmebus_request_irq(struct ibmebus_dev *dev,
			u32 ist,
			irq_handler_t handler,
			unsigned long irq_flags, const char * devname,
			void *dev_id)
{
	unsigned int irq = irq_create_mapping(NULL, ist);

	if (irq == NO_IRQ)
		return -EINVAL;

	return request_irq(irq, handler,
			   irq_flags, devname, dev_id);
}
EXPORT_SYMBOL(ibmebus_request_irq);

void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id)
{
	unsigned int irq = irq_find_mapping(NULL, ist);

	free_irq(irq, dev_id);
}
EXPORT_SYMBOL(ibmebus_free_irq);

static int ibmebus_bus_match(struct device *dev, struct device_driver *drv)
{
	const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
	struct ibmebus_driver *ebus_drv    = to_ibmebus_driver(drv);
	const struct of_device_id *ids     = ebus_drv->id_table;
	const struct of_device_id *found_id;

	if (!ids)
		return 0;

	found_id = of_match_device(ids, &ebus_dev->ofdev);
	if (found_id)
		return 1;

	return 0;
}

static ssize_t name_show(struct device *dev,
			 struct device_attribute *attr, char *buf)
{
	struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
	const char *name = of_get_property(ebus_dev->ofdev.node, "name", NULL);
	return sprintf(buf, "%s\n", name);
}

static struct device_attribute ibmebus_dev_attrs[] = {
	__ATTR_RO(name),
	__ATTR_NULL
};

static int ibmebus_match_path(struct device *dev, void *data)
{
	int rc;
	struct device_node *dn =
		of_node_get(to_ibmebus_dev(dev)->ofdev.node);

	rc = (dn->full_name && (strcasecmp((char*)data, dn->full_name) == 0));

	of_node_put(dn);
	return rc;
}

static char *ibmebus_chomp(const char *in, size_t count)
{
	char *out = kmalloc(count + 1, GFP_KERNEL);

	if (!out)
		return NULL;

	memcpy(out, in, count);
	out[count] = '\0';
	if (out[count - 1] == '\n')
		out[count - 1] = '\0';

	return out;
}

static ssize_t ibmebus_store_probe(struct bus_type *bus,
				   const char *buf, size_t count)
{
	struct device_node *dn = NULL;
	struct ibmebus_dev *dev;
	char *path;
	ssize_t rc;

	path = ibmebus_chomp(buf, count);
	if (!path)
		return -ENOMEM;

	if (bus_find_device(&ibmebus_bus_type, NULL, path,
			     ibmebus_match_path)) {
		printk(KERN_WARNING "%s: %s has already been probed\n",
		       __FUNCTION__, path);
		rc = -EINVAL;
		goto out;
	}

	if ((dn = of_find_node_by_path(path))) {
		dev = ibmebus_register_device_node(dn);
		of_node_put(dn);
		rc = IS_ERR(dev) ? PTR_ERR(dev) : count;
	} else {
		printk(KERN_WARNING "%s: no such device node: %s\n",
		       __FUNCTION__, path);
		rc = -ENODEV;
	}

out:
	kfree(path);
	return rc;
}

static ssize_t ibmebus_store_remove(struct bus_type *bus,
				    const char *buf, size_t count)
{
	struct device *dev;
	char *path;

	path = ibmebus_chomp(buf, count);
	if (!path)
		return -ENOMEM;

	if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
				   ibmebus_match_path))) {
		ibmebus_unregister_device(dev);

		kfree(path);
		return count;
	} else {
		printk(KERN_WARNING "%s: %s not on the bus\n",
		       __FUNCTION__, path);

		kfree(path);
		return -ENODEV;
	}
}

static struct bus_attribute ibmebus_bus_attrs[] = {
	__ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
	__ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
	__ATTR_NULL
};

struct bus_type ibmebus_bus_type = {
	.name      = "ibmebus",
	.match     = ibmebus_bus_match,
	.dev_attrs = ibmebus_dev_attrs,
	.bus_attrs = ibmebus_bus_attrs
};
EXPORT_SYMBOL(ibmebus_bus_type);

static int __init ibmebus_bus_init(void)
{
	int err;

	printk(KERN_INFO "IBM eBus Device Driver\n");

	err = bus_register(&ibmebus_bus_type);
	if (err) {
		printk(KERN_ERR ":%s: failed to register IBM eBus.\n",
		       __FUNCTION__);
		return err;
	}

	err = device_register(&ibmebus_bus_device);
	if (err) {
		printk(KERN_WARNING "%s: device_register returned %i\n",
		       __FUNCTION__, err);
		bus_unregister(&ibmebus_bus_type);

		return err;
	}

	return 0;
}
__initcall(ibmebus_bus_init);
Commit	Line	Data
d7a30103 HS	1	/*
	2	* IBM PowerPC IBM eBus Infrastructure Support.
	3	*
	4	* Copyright (c) 2005 IBM Corporation
6bccf755	5	* Joachim Fenkes <fenkes@de.ibm.com>
d7a30103	6	* Heiko J Schick <schickhj@de.ibm.com>
a8308800	7	*
d7a30103 HS	8	* All rights reserved.
d7a30103 HS	9	*
a8308800 JF	10	* This source code is distributed under a dual license of GPL v2.0 and OpenIB
a8308800 JF	11	* BSD.
d7a30103 HS	12	*
	13	* OpenIB BSD License
	14	*
a8308800 JF	15	* Redistribution and use in source and binary forms, with or without
a8308800 JF	16	* modification, are permitted provided that the following conditions are met:
d7a30103	17	*
a8308800 JF	18	* Redistributions of source code must retain the above copyright notice, this
a8308800 JF	19	* list of conditions and the following disclaimer.
d7a30103	20	*
a8308800 JF	21	* Redistributions in binary form must reproduce the above copyright notice,
a8308800 JF	22	* this list of conditions and the following disclaimer in the documentation
d7a30103	23	* and/or other materials
a8308800	24	* provided with the distribution.
d7a30103	25	*
a8308800 JF	26	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	27	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	28	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	29	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	30	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	31	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
d7a30103 HS	32	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
d7a30103 HS	33	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
a8308800 JF	34	* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
a8308800 JF	35	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
d7a30103 HS	36	* POSSIBILITY OF SUCH DAMAGE.
	37	*/
	38
	39	#include <linux/init.h>
	40	#include <linux/console.h>
	41	#include <linux/kobject.h>
	42	#include <linux/dma-mapping.h>
	43	#include <linux/interrupt.h>
	44	#include <asm/ibmebus.h>
	45	#include <asm/abs_addr.h>
	46
6bccf755 JF	47	static struct device ibmebus_bus_device = { /* fake "parent" device */
6bccf755 JF	48	.bus_id = "ibmebus",
d7a30103 HS	49	};
d7a30103 HS	50
6bccf755 JF	51	struct bus_type ibmebus_bus_type;
6bccf755 JF	52
d7a30103 HS	53	static void ibmebus_alloc_coherent(struct device dev,
	54	size_t size,
	55	dma_addr_t *dma_handle,
	56	gfp_t flag)
	57	{
	58	void *mem;
a8308800	59
d7a30103 HS	60	mem = kmalloc(size, flag);
	61	*dma_handle = (dma_addr_t)mem;
	62
	63	return mem;
	64	}
	65
	66	static void ibmebus_free_coherent(struct device *dev,
a8308800	67	size_t size, void *vaddr,
d7a30103 HS	68	dma_addr_t dma_handle)
	69	{
	70	kfree(vaddr);
	71	}
	72
	73	static dma_addr_t ibmebus_map_single(struct device *dev,
	74	void *ptr,
	75	size_t size,
	76	enum dma_data_direction direction)
	77	{
	78	return (dma_addr_t)(ptr);
	79	}
	80
	81	static void ibmebus_unmap_single(struct device *dev,
	82	dma_addr_t dma_addr,
a8308800	83	size_t size,
d7a30103 HS	84	enum dma_data_direction direction)
	85	{
	86	return;
	87	}
	88
	89	static int ibmebus_map_sg(struct device *dev,
	90	struct scatterlist *sg,
	91	int nents, enum dma_data_direction direction)
	92	{
	93	int i;
a8308800	94
d7a30103	95	for (i = 0; i < nents; i++) {
a8308800	96	sg[i].dma_address = (dma_addr_t)page_address(sg[i].page)
d7a30103 HS	97	+ sg[i].offset;
	98	sg[i].dma_length = sg[i].length;
	99	}
a8308800	100
d7a30103 HS	101	return nents;
	102	}
	103
	104	static void ibmebus_unmap_sg(struct device *dev,
	105	struct scatterlist *sg,
	106	int nents, enum dma_data_direction direction)
	107	{
	108	return;
	109	}
	110
	111	static int ibmebus_dma_supported(struct device *dev, u64 mask)
	112	{
	113	return 1;
	114	}
	115
12d04eef	116	static struct dma_mapping_ops ibmebus_dma_ops = {
d7a30103 HS	117	.alloc_coherent = ibmebus_alloc_coherent,
	118	.free_coherent = ibmebus_free_coherent,
	119	.map_single = ibmebus_map_single,
	120	.unmap_single = ibmebus_unmap_single,
	121	.map_sg = ibmebus_map_sg,
	122	.unmap_sg = ibmebus_unmap_sg,
	123	.dma_supported = ibmebus_dma_supported,
	124	};
	125
	126	static int ibmebus_bus_probe(struct device *dev)
	127	{
	128	struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev);
	129	struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
	130	const struct of_device_id *id;
	131	int error = -ENODEV;
a8308800	132
d7a30103 HS	133	if (!ibmebusdrv->probe)
d7a30103 HS	134	return error;
a8308800	135
d7a30103 HS	136	id = of_match_device(ibmebusdrv->id_table, &ibmebusdev->ofdev);
	137	if (id) {
	138	error = ibmebusdrv->probe(ibmebusdev, id);
	139	}
a8308800	140
d7a30103 HS	141	return error;
	142	}
	143
	144	static int ibmebus_bus_remove(struct device *dev)
	145	{
	146	struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev);
	147	struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
a8308800	148
d7a30103 HS	149	if (ibmebusdrv->remove) {
	150	return ibmebusdrv->remove(ibmebusdev);
	151	}
a8308800	152
d7a30103 HS	153	return 0;
	154	}
	155
	156	static void __devinit ibmebus_dev_release(struct device *dev)
	157	{
	158	of_node_put(to_ibmebus_dev(dev)->ofdev.node);
	159	kfree(to_ibmebus_dev(dev));
	160	}
	161
6bccf755	162	static int __devinit ibmebus_register_device_common(
a7f67bdf	163	struct ibmebus_dev dev, const char name)
d7a30103 HS	164	{
	165	int err = 0;
	166
6bccf755	167	dev->ofdev.dev.parent = &ibmebus_bus_device;
d7a30103 HS	168	dev->ofdev.dev.bus = &ibmebus_bus_type;
	169	dev->ofdev.dev.release = ibmebus_dev_release;
	170
12d04eef BH	171	dev->ofdev.dev.archdata.of_node = dev->ofdev.node;
	172	dev->ofdev.dev.archdata.dma_ops = &ibmebus_dma_ops;
	173	dev->ofdev.dev.archdata.numa_node = of_node_to_nid(dev->ofdev.node);
	174
d7a30103	175	/* An ibmebusdev is based on a of_device. We have to change the
a8308800 JF	176	* bus type to use our own DMA mapping operations.
a8308800 JF	177	*/
d7a30103 HS	178	if ((err = of_device_register(&dev->ofdev)) != 0) {
	179	printk(KERN_ERR "%s: failed to register device (%d).\n",
	180	__FUNCTION__, err);
6bccf755	181	return -ENODEV;
d7a30103	182	}
a8308800	183
6bccf755	184	return 0;
d7a30103 HS	185	}
	186
	187	static struct ibmebus_dev* __devinit ibmebus_register_device_node(
	188	struct device_node *dn)
	189	{
	190	struct ibmebus_dev *dev;
d8612417	191	int i, len, bus_len;
d7a30103	192
f8485350	193	dev = kzalloc(sizeof(struct ibmebus_dev), GFP_KERNEL);
d8612417	194	if (!dev)
6bccf755	195	return ERR_PTR(-ENOMEM);
d7a30103 HS	196
d7a30103 HS	197	dev->ofdev.node = of_node_get(dn);
a8308800	198
d8612417 JF	199	len = strlen(dn->full_name + 1);
	200	bus_len = min(len, BUS_ID_SIZE - 1);
	201	memcpy(dev->ofdev.dev.bus_id, dn->full_name + 1
	202	+ (len - bus_len), bus_len);
	203	for (i = 0; i < bus_len; i++)
	204	if (dev->ofdev.dev.bus_id[i] == '/')
	205	dev->ofdev.dev.bus_id[i] = '_';
d7a30103 HS	206
d7a30103 HS	207	/* Register with generic device framework. */
6bccf755	208	if (ibmebus_register_device_common(dev, dn->name) != 0) {
d7a30103	209	kfree(dev);
6bccf755	210	return ERR_PTR(-ENODEV);
d7a30103 HS	211	}
	212
	213	return dev;
	214	}
	215
	216	static void ibmebus_probe_of_nodes(char* name)
	217	{
	218	struct device_node *dn = NULL;
a8308800	219
d7a30103	220	while ((dn = of_find_node_by_name(dn, name))) {
6bccf755	221	if (IS_ERR(ibmebus_register_device_node(dn))) {
d7a30103	222	of_node_put(dn);
d7a30103 HS	223	return;
	224	}
	225	}
a8308800	226
d7a30103	227	of_node_put(dn);
a8308800	228
d7a30103 HS	229	return;
	230	}
	231
	232	static void ibmebus_add_devices_by_id(struct of_device_id *idt)
	233	{
	234	while (strlen(idt->name) > 0) {
	235	ibmebus_probe_of_nodes(idt->name);
	236	idt++;
	237	}
	238
	239	return;
	240	}
	241
0727702a	242	static int ibmebus_match_name(struct device dev, void data)
d7a30103	243	{
6bccf755	244	const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
e2eb6392	245	const char *name;
6bccf755	246
e2eb6392	247	name = of_get_property(ebus_dev->ofdev.node, "name", NULL);
6bccf755	248
e2eb6392	249	if (name && (strcmp(data, name) == 0))
d7a30103	250	return 1;
a8308800	251
d7a30103 HS	252	return 0;
	253	}
	254
	255	static int ibmebus_unregister_device(struct device *dev)
	256	{
d7a30103 HS	257	of_device_unregister(to_of_device(dev));
	258
	259	return 0;
	260	}
	261
	262	static void ibmebus_remove_devices_by_id(struct of_device_id *idt)
	263	{
	264	struct device *dev;
a8308800	265
d7a30103	266	while (strlen(idt->name) > 0) {
a8308800	267	while ((dev = bus_find_device(&ibmebus_bus_type, NULL,
d7a30103	268	(void*)idt->name,
0727702a	269	ibmebus_match_name))) {
d7a30103 HS	270	ibmebus_unregister_device(dev);
	271	}
	272	idt++;
d7a30103	273	}
a8308800	274
d7a30103 HS	275	return;
	276	}
	277
	278	int ibmebus_register_driver(struct ibmebus_driver *drv)
	279	{
	280	int err = 0;
	281
	282	drv->driver.name = drv->name;
	283	drv->driver.bus = &ibmebus_bus_type;
	284	drv->driver.probe = ibmebus_bus_probe;
	285	drv->driver.remove = ibmebus_bus_remove;
	286
	287	if ((err = driver_register(&drv->driver) != 0))
	288	return err;
	289
6bccf755 JF	290	/* remove all supported devices first, in case someone
	291	* probed them manually before registering the driver */
	292	ibmebus_remove_devices_by_id(drv->id_table);
d7a30103	293	ibmebus_add_devices_by_id(drv->id_table);
a8308800	294
d7a30103 HS	295	return 0;
	296	}
	297	EXPORT_SYMBOL(ibmebus_register_driver);
	298
	299	void ibmebus_unregister_driver(struct ibmebus_driver *drv)
a8308800	300	{
d7a30103 HS	301	driver_unregister(&drv->driver);
	302	ibmebus_remove_devices_by_id(drv->id_table);
	303	}
	304	EXPORT_SYMBOL(ibmebus_unregister_driver);
	305
	306	int ibmebus_request_irq(struct ibmebus_dev *dev,
a8308800	307	u32 ist,
40220c1a	308	irq_handler_t handler,
d7a30103 HS	309	unsigned long irq_flags, const char * devname,
	310	void *dev_id)
	311	{
6e99e458	312	unsigned int irq = irq_create_mapping(NULL, ist);
a8308800	313
d7a30103 HS	314	if (irq == NO_IRQ)
d7a30103 HS	315	return -EINVAL;
a8308800	316
d7a30103 HS	317	return request_irq(irq, handler,
	318	irq_flags, devname, dev_id);
	319	}
	320	EXPORT_SYMBOL(ibmebus_request_irq);
	321
	322	void ibmebus_free_irq(struct ibmebus_dev dev, u32 ist, void dev_id)
	323	{
0ebfff14	324	unsigned int irq = irq_find_mapping(NULL, ist);
a8308800	325
d7a30103	326	free_irq(irq, dev_id);
d7a30103 HS	327	}
	328	EXPORT_SYMBOL(ibmebus_free_irq);
	329
	330	static int ibmebus_bus_match(struct device dev, struct device_driver drv)
a8308800	331	{
d7a30103 HS	332	const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
	333	struct ibmebus_driver *ebus_drv = to_ibmebus_driver(drv);
	334	const struct of_device_id *ids = ebus_drv->id_table;
	335	const struct of_device_id *found_id;
a8308800	336
d7a30103 HS	337	if (!ids)
d7a30103 HS	338	return 0;
a8308800	339
d7a30103 HS	340	found_id = of_match_device(ids, &ebus_dev->ofdev);
	341	if (found_id)
	342	return 1;
a8308800	343
d7a30103 HS	344	return 0;
	345	}
	346
6bccf755 JF	347	static ssize_t name_show(struct device *dev,
	348	struct device_attribute attr, char buf)
	349	{
	350	struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
e2eb6392	351	const char *name = of_get_property(ebus_dev->ofdev.node, "name", NULL);
6bccf755 JF	352	return sprintf(buf, "%s\n", name);
	353	}
	354
	355	static struct device_attribute ibmebus_dev_attrs[] = {
	356	__ATTR_RO(name),
	357	__ATTR_NULL
	358	};
	359
0727702a	360	static int ibmebus_match_path(struct device dev, void data)
6bccf755	361	{
0727702a JF	362	int rc;
	363	struct device_node *dn =
	364	of_node_get(to_ibmebus_dev(dev)->ofdev.node);
6bccf755	365
0727702a	366	rc = (dn->full_name && (strcasecmp((char*)data, dn->full_name) == 0));
6bccf755	367
0727702a JF	368	of_node_put(dn);
	369	return rc;
	370	}
6bccf755	371
0727702a JF	372	static char ibmebus_chomp(const char in, size_t count)
0727702a JF	373	{
61a564fd JJ	374	char *out = kmalloc(count + 1, GFP_KERNEL);
61a564fd JJ	375
0727702a JF	376	if (!out)
	377	return NULL;
	378
	379	memcpy(out, in, count);
	380	out[count] = '\0';
	381	if (out[count - 1] == '\n')
	382	out[count - 1] = '\0';
	383
	384	return out;
6bccf755 JF	385	}
	386
	387	static ssize_t ibmebus_store_probe(struct bus_type *bus,
	388	const char *buf, size_t count)
	389	{
	390	struct device_node *dn = NULL;
	391	struct ibmebus_dev *dev;
0727702a JF	392	char *path;
	393	ssize_t rc;
	394
	395	path = ibmebus_chomp(buf, count);
	396	if (!path)
	397	return -ENOMEM;
	398
	399	if (bus_find_device(&ibmebus_bus_type, NULL, path,
	400	ibmebus_match_path)) {
	401	printk(KERN_WARNING "%s: %s has already been probed\n",
	402	__FUNCTION__, path);
	403	rc = -EINVAL;
	404	goto out;
6bccf755 JF	405	}
6bccf755 JF	406
0727702a JF	407	if ((dn = of_find_node_by_path(path))) {
	408	dev = ibmebus_register_device_node(dn);
	409	of_node_put(dn);
	410	rc = IS_ERR(dev) ? PTR_ERR(dev) : count;
	411	} else {
	412	printk(KERN_WARNING "%s: no such device node: %s\n",
	413	__FUNCTION__, path);
	414	rc = -ENODEV;
6bccf755 JF	415	}
6bccf755 JF	416
0727702a JF	417	out:
	418	kfree(path);
	419	return rc;
6bccf755 JF	420	}
	421
	422	static ssize_t ibmebus_store_remove(struct bus_type *bus,
	423	const char *buf, size_t count)
	424	{
	425	struct device *dev;
0727702a	426	char *path;
6bccf755	427
0727702a JF	428	path = ibmebus_chomp(buf, count);
	429	if (!path)
	430	return -ENOMEM;
	431
	432	if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
	433	ibmebus_match_path))) {
6bccf755	434	ibmebus_unregister_device(dev);
0727702a JF	435
	436	kfree(path);
	437	return count;
6bccf755	438	} else {
0727702a JF	439	printk(KERN_WARNING "%s: %s not on the bus\n",
	440	__FUNCTION__, path);
	441
	442	kfree(path);
6bccf755 JF	443	return -ENODEV;
6bccf755 JF	444	}
6bccf755 JF	445	}
	446
	447	static struct bus_attribute ibmebus_bus_attrs[] = {
	448	__ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
	449	__ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
	450	__ATTR_NULL
	451	};
	452
d7a30103	453	struct bus_type ibmebus_bus_type = {
6bccf755 JF	454	.name = "ibmebus",
	455	.match = ibmebus_bus_match,
	456	.dev_attrs = ibmebus_dev_attrs,
	457	.bus_attrs = ibmebus_bus_attrs
d7a30103 HS	458	};
	459	EXPORT_SYMBOL(ibmebus_bus_type);
	460
	461	static int __init ibmebus_bus_init(void)
	462	{
	463	int err;
a8308800	464
d7a30103	465	printk(KERN_INFO "IBM eBus Device Driver\n");
a8308800	466
d7a30103 HS	467	err = bus_register(&ibmebus_bus_type);
	468	if (err) {
	469	printk(KERN_ERR ":%s: failed to register IBM eBus.\n",
	470	__FUNCTION__);
	471	return err;
	472	}
a8308800	473
6bccf755	474	err = device_register(&ibmebus_bus_device);
d7a30103	475	if (err) {
a8308800	476	printk(KERN_WARNING "%s: device_register returned %i\n",
d7a30103 HS	477	__FUNCTION__, err);
	478	bus_unregister(&ibmebus_bus_type);
	479
	480	return err;
	481	}
a8308800	482
d7a30103 HS	483	return 0;
	484	}
	485	__initcall(ibmebus_bus_init);