[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 <linux/of.h>
#include <linux/slab.h>
#include <linux/of_platform.h>
#include <asm/ibmebus.h>
#include <asm/abs_addr.h>

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

struct bus_type ibmebus_bus_type;

/* These devices will automatically be added to the bus during init */
static struct of_device_id __initdata ibmebus_matches[] = {
	{ .compatible = "IBM,lhca" },
	{ .compatible = "IBM,lhea" },
	{},
};

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_page(struct device *dev,
				   struct page *page,
				   unsigned long offset,
				   size_t size,
				   enum dma_data_direction direction,
				   struct dma_attrs *attrs)
{
	return (dma_addr_t)(page_address(page) + offset);
}

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

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

	for_each_sg(sgl, sg, nents, i) {
		sg->dma_address = (dma_addr_t) sg_virt(sg);
		sg->dma_length = sg->length;
	}

	return nents;
}

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

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

static struct dma_map_ops ibmebus_dma_ops = {
	.alloc_coherent = ibmebus_alloc_coherent,
	.free_coherent  = ibmebus_free_coherent,
	.map_sg         = ibmebus_map_sg,
	.unmap_sg       = ibmebus_unmap_sg,
	.dma_supported  = ibmebus_dma_supported,
	.map_page       = ibmebus_map_page,
	.unmap_page     = ibmebus_unmap_page,
};

static int ibmebus_match_path(struct device *dev, void *data)
{
	struct device_node *dn = to_platform_device(dev)->dev.of_node;
	return (dn->full_name &&
		(strcasecmp((char *)data, dn->full_name) == 0));
}

static int ibmebus_match_node(struct device *dev, void *data)
{
	return to_platform_device(dev)->dev.of_node == data;
}

static int ibmebus_create_device(struct device_node *dn)
{
	struct platform_device *dev;
	int ret;

	dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
	if (!dev)
		return -ENOMEM;

	dev->dev.bus = &ibmebus_bus_type;
	dev->dev.archdata.dma_ops = &ibmebus_dma_ops;

	ret = of_device_add(dev);
	if (ret)
		platform_device_put(dev);
	return ret;
}

static int ibmebus_create_devices(const struct of_device_id *matches)
{
	struct device_node *root, *child;
	int ret = 0;

	root = of_find_node_by_path("/");

	for_each_child_of_node(root, child) {
		if (!of_match_node(matches, child))
			continue;

		if (bus_find_device(&ibmebus_bus_type, NULL, child,
				    ibmebus_match_node))
			continue;

		ret = ibmebus_create_device(child);
		if (ret) {
			printk(KERN_ERR "%s: failed to create device (%i)",
			       __func__, ret);
			of_node_put(child);
			break;
		}
	}

	of_node_put(root);
	return ret;
}

int ibmebus_register_driver(struct of_platform_driver *drv)
{
	/* If the driver uses devices that ibmebus doesn't know, add them */
	ibmebus_create_devices(drv->driver.of_match_table);

	drv->driver.bus = &ibmebus_bus_type;
	return driver_register(&drv->driver);
}
EXPORT_SYMBOL(ibmebus_register_driver);

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

int ibmebus_request_irq(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(u32 ist, void *dev_id)
{
	unsigned int irq = irq_find_mapping(NULL, ist);

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

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;
	char *path;
	ssize_t rc = 0;

	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",
		       __func__, path);
		rc = -EEXIST;
		goto out;
	}

	if ((dn = of_find_node_by_path(path))) {
		rc = ibmebus_create_device(dn);
		of_node_put(dn);
	} else {
		printk(KERN_WARNING "%s: no such device node: %s\n",
		       __func__, path);
		rc = -ENODEV;
	}

out:
	kfree(path);
	if (rc)
		return rc;
	return count;
}

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))) {
		of_device_unregister(to_platform_device(dev));

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

static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv)
{
	const struct of_device_id *matches = drv->of_match_table;

	if (!matches)
		return 0;

	return of_match_device(matches, dev) != NULL;
}

static int ibmebus_bus_device_probe(struct device *dev)
{
	int error = -ENODEV;
	struct of_platform_driver *drv;
	struct platform_device *of_dev;
	const struct of_device_id *match;

	drv = to_of_platform_driver(dev->driver);
	of_dev = to_platform_device(dev);

	if (!drv->probe)
		return error;

	of_dev_get(of_dev);

	match = of_match_device(drv->driver.of_match_table, dev);
	if (match)
		error = drv->probe(of_dev, match);
	if (error)
		of_dev_put(of_dev);

	return error;
}

static int ibmebus_bus_device_remove(struct device *dev)
{
	struct platform_device *of_dev = to_platform_device(dev);
	struct of_platform_driver *drv = to_of_platform_driver(dev->driver);

	if (dev->driver && drv->remove)
		drv->remove(of_dev);
	return 0;
}

static void ibmebus_bus_device_shutdown(struct device *dev)
{
	struct platform_device *of_dev = to_platform_device(dev);
	struct of_platform_driver *drv = to_of_platform_driver(dev->driver);

	if (dev->driver && drv->shutdown)
		drv->shutdown(of_dev);
}

/*
 * ibmebus_bus_device_attrs
 */
static ssize_t devspec_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct platform_device *ofdev;

	ofdev = to_platform_device(dev);
	return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name);
}

static ssize_t name_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct platform_device *ofdev;

	ofdev = to_platform_device(dev);
	return sprintf(buf, "%s\n", ofdev->dev.of_node->name);
}

static ssize_t modalias_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2);
	buf[len] = '\n';
	buf[len+1] = 0;
	return len+1;
}

struct device_attribute ibmebus_bus_device_attrs[] = {
	__ATTR_RO(devspec),
	__ATTR_RO(name),
	__ATTR_RO(modalias),
	__ATTR_NULL
};

#ifdef CONFIG_PM_SLEEP
static int ibmebus_bus_legacy_suspend(struct device *dev, pm_message_t mesg)
{
	struct platform_device *of_dev = to_platform_device(dev);
	struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
	int ret = 0;

	if (dev->driver && drv->suspend)
		ret = drv->suspend(of_dev, mesg);
	return ret;
}

static int ibmebus_bus_legacy_resume(struct device *dev)
{
	struct platform_device *of_dev = to_platform_device(dev);
	struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
	int ret = 0;

	if (dev->driver && drv->resume)
		ret = drv->resume(of_dev);
	return ret;
}

static int ibmebus_bus_pm_prepare(struct device *dev)
{
	struct device_driver *drv = dev->driver;
	int ret = 0;

	if (drv && drv->pm && drv->pm->prepare)
		ret = drv->pm->prepare(dev);

	return ret;
}

static void ibmebus_bus_pm_complete(struct device *dev)
{
	struct device_driver *drv = dev->driver;

	if (drv && drv->pm && drv->pm->complete)
		drv->pm->complete(dev);
}

#ifdef CONFIG_SUSPEND

static int ibmebus_bus_pm_suspend(struct device *dev)
{
	struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->suspend)
			ret = drv->pm->suspend(dev);
	} else {
		ret = ibmebus_bus_legacy_suspend(dev, PMSG_SUSPEND);
	}

	return ret;
}

static int ibmebus_bus_pm_suspend_noirq(struct device *dev)
{
	struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->suspend_noirq)
			ret = drv->pm->suspend_noirq(dev);
	}

	return ret;
}

static int ibmebus_bus_pm_resume(struct device *dev)
{
	struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->resume)
			ret = drv->pm->resume(dev);
	} else {
		ret = ibmebus_bus_legacy_resume(dev);
	}

	return ret;
}

static int ibmebus_bus_pm_resume_noirq(struct device *dev)
{
	struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->resume_noirq)
			ret = drv->pm->resume_noirq(dev);
	}

	return ret;
}

#else /* !CONFIG_SUSPEND */

#define ibmebus_bus_pm_suspend		NULL
#define ibmebus_bus_pm_resume		NULL
#define ibmebus_bus_pm_suspend_noirq	NULL
#define ibmebus_bus_pm_resume_noirq	NULL

#endif /* !CONFIG_SUSPEND */

#ifdef CONFIG_HIBERNATION

static int ibmebus_bus_pm_freeze(struct device *dev)
{
	struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->freeze)
			ret = drv->pm->freeze(dev);
	} else {
		ret = ibmebus_bus_legacy_suspend(dev, PMSG_FREEZE);
	}

	return ret;
}

static int ibmebus_bus_pm_freeze_noirq(struct device *dev)
{
	struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->freeze_noirq)
			ret = drv->pm->freeze_noirq(dev);
	}

	return ret;
}

static int ibmebus_bus_pm_thaw(struct device *dev)
{
	struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->thaw)
			ret = drv->pm->thaw(dev);
	} else {
		ret = ibmebus_bus_legacy_resume(dev);
	}

	return ret;
}

static int ibmebus_bus_pm_thaw_noirq(struct device *dev)
{
	struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->thaw_noirq)
			ret = drv->pm->thaw_noirq(dev);
	}

	return ret;
}

static int ibmebus_bus_pm_poweroff(struct device *dev)
{
	struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->poweroff)
			ret = drv->pm->poweroff(dev);
	} else {
		ret = ibmebus_bus_legacy_suspend(dev, PMSG_HIBERNATE);
	}

	return ret;
}

static int ibmebus_bus_pm_poweroff_noirq(struct device *dev)
{
	struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->poweroff_noirq)
			ret = drv->pm->poweroff_noirq(dev);
	}

	return ret;
}

static int ibmebus_bus_pm_restore(struct device *dev)
{
	struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->restore)
			ret = drv->pm->restore(dev);
	} else {
		ret = ibmebus_bus_legacy_resume(dev);
	}

	return ret;
}

static int ibmebus_bus_pm_restore_noirq(struct device *dev)
{
	struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->restore_noirq)
			ret = drv->pm->restore_noirq(dev);
	}

	return ret;
}

#else /* !CONFIG_HIBERNATION */

#define ibmebus_bus_pm_freeze		NULL
#define ibmebus_bus_pm_thaw		NULL
#define ibmebus_bus_pm_poweroff		NULL
#define ibmebus_bus_pm_restore		NULL
#define ibmebus_bus_pm_freeze_noirq	NULL
#define ibmebus_bus_pm_thaw_noirq		NULL
#define ibmebus_bus_pm_poweroff_noirq	NULL
#define ibmebus_bus_pm_restore_noirq	NULL

#endif /* !CONFIG_HIBERNATION */

static struct dev_pm_ops ibmebus_bus_dev_pm_ops = {
	.prepare = ibmebus_bus_pm_prepare,
	.complete = ibmebus_bus_pm_complete,
	.suspend = ibmebus_bus_pm_suspend,
	.resume = ibmebus_bus_pm_resume,
	.freeze = ibmebus_bus_pm_freeze,
	.thaw = ibmebus_bus_pm_thaw,
	.poweroff = ibmebus_bus_pm_poweroff,
	.restore = ibmebus_bus_pm_restore,
	.suspend_noirq = ibmebus_bus_pm_suspend_noirq,
	.resume_noirq = ibmebus_bus_pm_resume_noirq,
	.freeze_noirq = ibmebus_bus_pm_freeze_noirq,
	.thaw_noirq = ibmebus_bus_pm_thaw_noirq,
	.poweroff_noirq = ibmebus_bus_pm_poweroff_noirq,
	.restore_noirq = ibmebus_bus_pm_restore_noirq,
};

#define IBMEBUS_BUS_PM_OPS_PTR	(&ibmebus_bus_dev_pm_ops)

#else /* !CONFIG_PM_SLEEP */

#define IBMEBUS_BUS_PM_OPS_PTR	NULL

#endif /* !CONFIG_PM_SLEEP */

struct bus_type ibmebus_bus_type = {
	.name      = "ibmebus",
	.uevent    = of_device_uevent,
	.bus_attrs = ibmebus_bus_attrs,
	.match     = ibmebus_bus_bus_match,
	.probe     = ibmebus_bus_device_probe,
	.remove    = ibmebus_bus_device_remove,
	.shutdown  = ibmebus_bus_device_shutdown,
	.dev_attrs = ibmebus_bus_device_attrs,
	.pm        = IBMEBUS_BUS_PM_OPS_PTR,
};
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",
		       __func__);
		return err;
	}

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

		return err;
	}

	err = ibmebus_create_devices(ibmebus_matches);
	if (err) {
		device_unregister(&ibmebus_bus_device);
		bus_unregister(&ibmebus_bus_type);
		return err;
	}

	return 0;
}
postcore_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>
283029d1	44	#include <linux/of.h>
5a0e3ad6	45	#include <linux/slab.h>
a988c0a6	46	#include <linux/of_platform.h>
d7a30103 HS	47	#include <asm/ibmebus.h>
	48	#include <asm/abs_addr.h>
	49
6bccf755	50	static struct device ibmebus_bus_device = { /* fake "parent" device */
aab0d375	51	.init_name = "ibmebus",
d7a30103 HS	52	};
d7a30103 HS	53
6bccf755 JF	54	struct bus_type ibmebus_bus_type;
6bccf755 JF	55
55347cc9	56	/* These devices will automatically be added to the bus during init */
1b17adf1	57	static struct of_device_id __initdata ibmebus_matches[] = {
55347cc9 JF	58	{ .compatible = "IBM,lhca" },
	59	{ .compatible = "IBM,lhea" },
	60	{},
	61	};
	62
d7a30103 HS	63	static void ibmebus_alloc_coherent(struct device dev,
	64	size_t size,
	65	dma_addr_t *dma_handle,
	66	gfp_t flag)
	67	{
	68	void *mem;
a8308800	69
d7a30103 HS	70	mem = kmalloc(size, flag);
	71	*dma_handle = (dma_addr_t)mem;
	72
	73	return mem;
	74	}
	75
	76	static void ibmebus_free_coherent(struct device *dev,
a8308800	77	size_t size, void *vaddr,
d7a30103 HS	78	dma_addr_t dma_handle)
	79	{
	80	kfree(vaddr);
	81	}
	82
f9226d57 MN	83	static dma_addr_t ibmebus_map_page(struct device *dev,
	84	struct page *page,
	85	unsigned long offset,
	86	size_t size,
	87	enum dma_data_direction direction,
	88	struct dma_attrs *attrs)
d7a30103	89	{
f9226d57	90	return (dma_addr_t)(page_address(page) + offset);
d7a30103 HS	91	}
d7a30103 HS	92
f9226d57 MN	93	static void ibmebus_unmap_page(struct device *dev,
	94	dma_addr_t dma_addr,
	95	size_t size,
	96	enum dma_data_direction direction,
	97	struct dma_attrs *attrs)
d7a30103 HS	98	{
	99	return;
	100	}
	101
	102	static int ibmebus_map_sg(struct device *dev,
78bdc310	103	struct scatterlist *sgl,
3affedc4 MN	104	int nents, enum dma_data_direction direction,
3affedc4 MN	105	struct dma_attrs *attrs)
d7a30103	106	{
78bdc310	107	struct scatterlist *sg;
d7a30103	108	int i;
a8308800	109
78bdc310	110	for_each_sg(sgl, sg, nents, i) {
58b053e4	111	sg->dma_address = (dma_addr_t) sg_virt(sg);
78bdc310	112	sg->dma_length = sg->length;
d7a30103	113	}
a8308800	114
d7a30103 HS	115	return nents;
	116	}
	117
	118	static void ibmebus_unmap_sg(struct device *dev,
	119	struct scatterlist *sg,
3affedc4 MN	120	int nents, enum dma_data_direction direction,
3affedc4 MN	121	struct dma_attrs *attrs)
d7a30103 HS	122	{
	123	return;
	124	}
	125
	126	static int ibmebus_dma_supported(struct device *dev, u64 mask)
	127	{
	128	return 1;
	129	}
	130
45223c54	131	static struct dma_map_ops ibmebus_dma_ops = {
d7a30103 HS	132	.alloc_coherent = ibmebus_alloc_coherent,
d7a30103 HS	133	.free_coherent = ibmebus_free_coherent,
d7a30103 HS	134	.map_sg = ibmebus_map_sg,
	135	.unmap_sg = ibmebus_unmap_sg,
	136	.dma_supported = ibmebus_dma_supported,
f9226d57 MN	137	.map_page = ibmebus_map_page,
f9226d57 MN	138	.unmap_page = ibmebus_unmap_page,
d7a30103 HS	139	};
d7a30103 HS	140
55347cc9 JF	141	static int ibmebus_match_path(struct device dev, void data)
55347cc9 JF	142	{
a454dc50	143	struct device_node *dn = to_platform_device(dev)->dev.of_node;
55347cc9 JF	144	return (dn->full_name &&
	145	(strcasecmp((char *)data, dn->full_name) == 0));
	146	}
	147
	148	static int ibmebus_match_node(struct device dev, void data)
	149	{
a454dc50	150	return to_platform_device(dev)->dev.of_node == data;
55347cc9 JF	151	}
	152
	153	static int ibmebus_create_device(struct device_node *dn)
	154	{
a454dc50	155	struct platform_device *dev;
55347cc9 JF	156	int ret;
	157
	158	dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
	159	if (!dev)
	160	return -ENOMEM;
	161
	162	dev->dev.bus = &ibmebus_bus_type;
	163	dev->dev.archdata.dma_ops = &ibmebus_dma_ops;
	164
7096d042 GL	165	ret = of_device_add(dev);
	166	if (ret)
	167	platform_device_put(dev);
	168	return ret;
55347cc9 JF	169	}
	170
	171	static int ibmebus_create_devices(const struct of_device_id *matches)
	172	{
	173	struct device_node root, child;
	174	int ret = 0;
	175
	176	root = of_find_node_by_path("/");
	177
85e99b9f	178	for_each_child_of_node(root, child) {
55347cc9 JF	179	if (!of_match_node(matches, child))
	180	continue;
	181
	182	if (bus_find_device(&ibmebus_bus_type, NULL, child,
	183	ibmebus_match_node))
	184	continue;
	185
	186	ret = ibmebus_create_device(child);
	187	if (ret) {
	188	printk(KERN_ERR "%s: failed to create device (%i)",
e48b1b45	189	__func__, ret);
55347cc9 JF	190	of_node_put(child);
	191	break;
	192	}
	193	}
	194
	195	of_node_put(root);
	196	return ret;
	197	}
	198
6b08f3ae	199	int ibmebus_register_driver(struct of_platform_driver *drv)
d7a30103	200	{
6b08f3ae	201	/* If the driver uses devices that ibmebus doesn't know, add them */
597b9d1e	202	ibmebus_create_devices(drv->driver.of_match_table);
6b08f3ae	203
710ac54b GL	204	drv->driver.bus = &ibmebus_bus_type;
710ac54b GL	205	return driver_register(&drv->driver);
d7a30103 HS	206	}
	207	EXPORT_SYMBOL(ibmebus_register_driver);
	208
6b08f3ae	209	void ibmebus_unregister_driver(struct of_platform_driver *drv)
a8308800	210	{
710ac54b	211	driver_unregister(&drv->driver);
d7a30103 HS	212	}
	213	EXPORT_SYMBOL(ibmebus_unregister_driver);
	214
6b08f3ae JF	215	int ibmebus_request_irq(u32 ist, irq_handler_t handler,
6b08f3ae JF	216	unsigned long irq_flags, const char *devname,
d7a30103 HS	217	void *dev_id)
d7a30103 HS	218	{
6e99e458	219	unsigned int irq = irq_create_mapping(NULL, ist);
a8308800	220
d7a30103 HS	221	if (irq == NO_IRQ)
d7a30103 HS	222	return -EINVAL;
a8308800	223
6b08f3ae	224	return request_irq(irq, handler, irq_flags, devname, dev_id);
d7a30103 HS	225	}
	226	EXPORT_SYMBOL(ibmebus_request_irq);
	227
6b08f3ae	228	void ibmebus_free_irq(u32 ist, void *dev_id)
d7a30103	229	{
0ebfff14	230	unsigned int irq = irq_find_mapping(NULL, ist);
a8308800	231
d7a30103	232	free_irq(irq, dev_id);
6358d6cb	233	irq_dispose_mapping(irq);
d7a30103 HS	234	}
	235	EXPORT_SYMBOL(ibmebus_free_irq);
	236
0727702a JF	237	static char ibmebus_chomp(const char in, size_t count)
0727702a JF	238	{
61a564fd JJ	239	char *out = kmalloc(count + 1, GFP_KERNEL);
61a564fd JJ	240
0727702a JF	241	if (!out)
	242	return NULL;
	243
	244	memcpy(out, in, count);
	245	out[count] = '\0';
	246	if (out[count - 1] == '\n')
	247	out[count - 1] = '\0';
	248
	249	return out;
6bccf755 JF	250	}
	251
	252	static ssize_t ibmebus_store_probe(struct bus_type *bus,
	253	const char *buf, size_t count)
	254	{
	255	struct device_node *dn = NULL;
0727702a	256	char *path;
55347cc9	257	ssize_t rc = 0;
0727702a JF	258
	259	path = ibmebus_chomp(buf, count);
	260	if (!path)
	261	return -ENOMEM;
	262
	263	if (bus_find_device(&ibmebus_bus_type, NULL, path,
74c9b99d	264	ibmebus_match_path)) {
0727702a	265	printk(KERN_WARNING "%s: %s has already been probed\n",
e48b1b45	266	__func__, path);
74c9b99d	267	rc = -EEXIST;
0727702a	268	goto out;
6bccf755 JF	269	}
6bccf755 JF	270
0727702a	271	if ((dn = of_find_node_by_path(path))) {
55347cc9	272	rc = ibmebus_create_device(dn);
0727702a	273	of_node_put(dn);
0727702a JF	274	} else {
0727702a JF	275	printk(KERN_WARNING "%s: no such device node: %s\n",
e48b1b45	276	__func__, path);
0727702a	277	rc = -ENODEV;
6bccf755 JF	278	}
6bccf755 JF	279
0727702a JF	280	out:
0727702a JF	281	kfree(path);
55347cc9 JF	282	if (rc)
	283	return rc;
	284	return count;
6bccf755 JF	285	}
	286
	287	static ssize_t ibmebus_store_remove(struct bus_type *bus,
	288	const char *buf, size_t count)
	289	{
	290	struct device *dev;
0727702a	291	char *path;
6bccf755	292
0727702a JF	293	path = ibmebus_chomp(buf, count);
	294	if (!path)
	295	return -ENOMEM;
	296
	297	if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
	298	ibmebus_match_path))) {
a454dc50	299	of_device_unregister(to_platform_device(dev));
0727702a JF	300
	301	kfree(path);
	302	return count;
6bccf755	303	} else {
0727702a	304	printk(KERN_WARNING "%s: %s not on the bus\n",
e48b1b45	305	__func__, path);
0727702a JF	306
0727702a JF	307	kfree(path);
6bccf755 JF	308	return -ENODEV;
6bccf755 JF	309	}
6bccf755 JF	310	}
6bccf755 JF	311
710ac54b	312
6bccf755 JF	313	static struct bus_attribute ibmebus_bus_attrs[] = {
	314	__ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
	315	__ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
	316	__ATTR_NULL
	317	};
	318
710ac54b GL	319	static int ibmebus_bus_bus_match(struct device dev, struct device_driver drv)
	320	{
	321	const struct of_device_id *matches = drv->of_match_table;
	322
	323	if (!matches)
	324	return 0;
	325
	326	return of_match_device(matches, dev) != NULL;
	327	}
	328
	329	static int ibmebus_bus_device_probe(struct device *dev)
	330	{
	331	int error = -ENODEV;
	332	struct of_platform_driver *drv;
	333	struct platform_device *of_dev;
	334	const struct of_device_id *match;
	335
	336	drv = to_of_platform_driver(dev->driver);
	337	of_dev = to_platform_device(dev);
	338
	339	if (!drv->probe)
	340	return error;
	341
	342	of_dev_get(of_dev);
	343
	344	match = of_match_device(drv->driver.of_match_table, dev);
	345	if (match)
	346	error = drv->probe(of_dev, match);
	347	if (error)
	348	of_dev_put(of_dev);
	349
	350	return error;
	351	}
	352
	353	static int ibmebus_bus_device_remove(struct device *dev)
	354	{
	355	struct platform_device *of_dev = to_platform_device(dev);
	356	struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
	357
	358	if (dev->driver && drv->remove)
	359	drv->remove(of_dev);
	360	return 0;
	361	}
	362
	363	static void ibmebus_bus_device_shutdown(struct device *dev)
	364	{
	365	struct platform_device *of_dev = to_platform_device(dev);
	366	struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
	367
	368	if (dev->driver && drv->shutdown)
	369	drv->shutdown(of_dev);
	370	}
	371
	372	/*
	373	* ibmebus_bus_device_attrs
	374	*/
	375	static ssize_t devspec_show(struct device *dev,
	376	struct device_attribute attr, char buf)
	377	{
	378	struct platform_device *ofdev;
	379
	380	ofdev = to_platform_device(dev);
	381	return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name);
	382	}
383
384	static ssize_t name_show(struct device *dev,
385	struct device_attribute attr, char buf)
386	{
387	struct platform_device *ofdev;
388
389	ofdev = to_platform_device(dev);
390	return sprintf(buf, "%s\n", ofdev->dev.of_node->name);
391	}
392
393	static ssize_t modalias_show(struct device *dev,
394	struct device_attribute attr, char buf)
395	{
396	ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2);
397	buf[len] = '\n';
398	buf[len+1] = 0;
399	return len+1;
400	}
401
402	struct device_attribute ibmebus_bus_device_attrs[] = {
403	__ATTR_RO(devspec),
404	__ATTR_RO(name),
405	__ATTR_RO(modalias),
406	__ATTR_NULL
407	};
408
409	#ifdef CONFIG_PM_SLEEP
410	static int ibmebus_bus_legacy_suspend(struct device *dev, pm_message_t mesg)
411	{
412	struct platform_device *of_dev = to_platform_device(dev);
413	struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
414	int ret = 0;
415
416	if (dev->driver && drv->suspend)
417	ret = drv->suspend(of_dev, mesg);
418	return ret;
419	}
420
421	static int ibmebus_bus_legacy_resume(struct device *dev)
422	{
423	struct platform_device *of_dev = to_platform_device(dev);
424	struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
425	int ret = 0;
426
427	if (dev->driver && drv->resume)
428	ret = drv->resume(of_dev);
429	return ret;
430	}
431
432	static int ibmebus_bus_pm_prepare(struct device *dev)
433	{
434	struct device_driver *drv = dev->driver;
435	int ret = 0;
436
437	if (drv && drv->pm && drv->pm->prepare)
438	ret = drv->pm->prepare(dev);
439
440	return ret;
441	}
442
443	static void ibmebus_bus_pm_complete(struct device *dev)
444	{
445	struct device_driver *drv = dev->driver;
446
447	if (drv && drv->pm && drv->pm->complete)
448	drv->pm->complete(dev);
449	}
450
451	#ifdef CONFIG_SUSPEND
452
453	static int ibmebus_bus_pm_suspend(struct device *dev)
454	{
455	struct device_driver *drv = dev->driver;
456	int ret = 0;
457
458	if (!drv)
459	return 0;
460
461	if (drv->pm) {
462	if (drv->pm->suspend)
463	ret = drv->pm->suspend(dev);
464	} else {
465	ret = ibmebus_bus_legacy_suspend(dev, PMSG_SUSPEND);
466	}
467
468	return ret;
469	}
470
471	static int ibmebus_bus_pm_suspend_noirq(struct device *dev)
472	{
473	struct device_driver *drv = dev->driver;
474	int ret = 0;
475
476	if (!drv)
477	return 0;
478
479	if (drv->pm) {
480	if (drv->pm->suspend_noirq)
481	ret = drv->pm->suspend_noirq(dev);
482	}
483
484	return ret;
485	}
486
487	static int ibmebus_bus_pm_resume(struct device *dev)
488	{
489	struct device_driver *drv = dev->driver;
490	int ret = 0;
491
492	if (!drv)
493	return 0;
494
495	if (drv->pm) {
496	if (drv->pm->resume)
497	ret = drv->pm->resume(dev);
498	} else {
499	ret = ibmebus_bus_legacy_resume(dev);
500	}
501
502	return ret;
503	}
504
505	static int ibmebus_bus_pm_resume_noirq(struct device *dev)
506	{
507	struct device_driver *drv = dev->driver;
508	int ret = 0;
509
510	if (!drv)
511	return 0;
512
513	if (drv->pm) {
514	if (drv->pm->resume_noirq)
515	ret = drv->pm->resume_noirq(dev);
516	}
517
518	return ret;
519	}
520
521	#else /* !CONFIG_SUSPEND */
522
523	#define ibmebus_bus_pm_suspend NULL
524	#define ibmebus_bus_pm_resume NULL
525	#define ibmebus_bus_pm_suspend_noirq NULL
526	#define ibmebus_bus_pm_resume_noirq NULL
527
528	#endif /* !CONFIG_SUSPEND */
529
530	#ifdef CONFIG_HIBERNATION
531
532	static int ibmebus_bus_pm_freeze(struct device *dev)
533	{
534	struct device_driver *drv = dev->driver;
535	int ret = 0;
536
537	if (!drv)
538	return 0;
539
540	if (drv->pm) {
541	if (drv->pm->freeze)
542	ret = drv->pm->freeze(dev);
543	} else {
544	ret = ibmebus_bus_legacy_suspend(dev, PMSG_FREEZE);
545	}
546
547	return ret;
548	}
549
550	static int ibmebus_bus_pm_freeze_noirq(struct device *dev)
551	{
552	struct device_driver *drv = dev->driver;
553	int ret = 0;
554
555	if (!drv)
556	return 0;
557
558	if (drv->pm) {
559	if (drv->pm->freeze_noirq)
560	ret = drv->pm->freeze_noirq(dev);
561	}
562
563	return ret;
564	}
565
566	static int ibmebus_bus_pm_thaw(struct device *dev)
567	{
568	struct device_driver *drv = dev->driver;
569	int ret = 0;
570
571	if (!drv)
572	return 0;
573
574	if (drv->pm) {
575	if (drv->pm->thaw)
576	ret = drv->pm->thaw(dev);
577	} else {
578	ret = ibmebus_bus_legacy_resume(dev);
579	}
580
581	return ret;
582	}
583
584	static int ibmebus_bus_pm_thaw_noirq(struct device *dev)
585	{
586	struct device_driver *drv = dev->driver;
587	int ret = 0;
588
589	if (!drv)
590	return 0;
591
592	if (drv->pm) {
593	if (drv->pm->thaw_noirq)
594	ret = drv->pm->thaw_noirq(dev);
595	}
596
597	return ret;
598	}
599
600	static int ibmebus_bus_pm_poweroff(struct device *dev)
601	{
602	struct device_driver *drv = dev->driver;
603	int ret = 0;
604
605	if (!drv)
606	return 0;
607
608	if (drv->pm) {
609	if (drv->pm->poweroff)
610	ret = drv->pm->poweroff(dev);
611	} else {
612	ret = ibmebus_bus_legacy_suspend(dev, PMSG_HIBERNATE);
613	}
614
615	return ret;
616	}
617
618	static int ibmebus_bus_pm_poweroff_noirq(struct device *dev)
619	{
620	struct device_driver *drv = dev->driver;
621	int ret = 0;
622
623	if (!drv)
624	return 0;
625
626	if (drv->pm) {
627	if (drv->pm->poweroff_noirq)
628	ret = drv->pm->poweroff_noirq(dev);
629	}
630
631	return ret;
632	}
633
634	static int ibmebus_bus_pm_restore(struct device *dev)
635	{
636	struct device_driver *drv = dev->driver;
637	int ret = 0;
638
639	if (!drv)
640	return 0;
641
642	if (drv->pm) {
643	if (drv->pm->restore)
644	ret = drv->pm->restore(dev);
645	} else {
646	ret = ibmebus_bus_legacy_resume(dev);
647	}
648
649	return ret;
650	}
651
652	static int ibmebus_bus_pm_restore_noirq(struct device *dev)
653	{
654	struct device_driver *drv = dev->driver;
655	int ret = 0;
656
657	if (!drv)
658	return 0;
659
660	if (drv->pm) {
661	if (drv->pm->restore_noirq)
662	ret = drv->pm->restore_noirq(dev);
663	}
664
665	return ret;
666	}
667
668	#else /* !CONFIG_HIBERNATION */
669
670	#define ibmebus_bus_pm_freeze NULL
671	#define ibmebus_bus_pm_thaw NULL
672	#define ibmebus_bus_pm_poweroff NULL
673	#define ibmebus_bus_pm_restore NULL
674	#define ibmebus_bus_pm_freeze_noirq NULL
675	#define ibmebus_bus_pm_thaw_noirq NULL
676	#define ibmebus_bus_pm_poweroff_noirq NULL
677	#define ibmebus_bus_pm_restore_noirq NULL
678
679	#endif /* !CONFIG_HIBERNATION */
680
681	static struct dev_pm_ops ibmebus_bus_dev_pm_ops = {
682	.prepare = ibmebus_bus_pm_prepare,
683	.complete = ibmebus_bus_pm_complete,
684	.suspend = ibmebus_bus_pm_suspend,
685	.resume = ibmebus_bus_pm_resume,
686	.freeze = ibmebus_bus_pm_freeze,
687	.thaw = ibmebus_bus_pm_thaw,
688	.poweroff = ibmebus_bus_pm_poweroff,
689	.restore = ibmebus_bus_pm_restore,
690	.suspend_noirq = ibmebus_bus_pm_suspend_noirq,
691	.resume_noirq = ibmebus_bus_pm_resume_noirq,
692	.freeze_noirq = ibmebus_bus_pm_freeze_noirq,
693	.thaw_noirq = ibmebus_bus_pm_thaw_noirq,
694	.poweroff_noirq = ibmebus_bus_pm_poweroff_noirq,
695	.restore_noirq = ibmebus_bus_pm_restore_noirq,
696	};
697
698	#define IBMEBUS_BUS_PM_OPS_PTR (&ibmebus_bus_dev_pm_ops)
699
700	#else /* !CONFIG_PM_SLEEP */
701
702	#define IBMEBUS_BUS_PM_OPS_PTR NULL
703
704	#endif /* !CONFIG_PM_SLEEP */
705
d7a30103	706	struct bus_type ibmebus_bus_type = {
710ac54b	707	.name = "ibmebus",
55347cc9	708	.uevent = of_device_uevent,
710ac54b GL	709	.bus_attrs = ibmebus_bus_attrs,
	710	.match = ibmebus_bus_bus_match,
	711	.probe = ibmebus_bus_device_probe,
	712	.remove = ibmebus_bus_device_remove,
	713	.shutdown = ibmebus_bus_device_shutdown,
	714	.dev_attrs = ibmebus_bus_device_attrs,
	715	.pm = IBMEBUS_BUS_PM_OPS_PTR,
d7a30103 HS	716	};
	717	EXPORT_SYMBOL(ibmebus_bus_type);
	718
	719	static int __init ibmebus_bus_init(void)
	720	{
	721	int err;
a8308800	722
d7a30103	723	printk(KERN_INFO "IBM eBus Device Driver\n");
a8308800	724
710ac54b	725	err = bus_register(&ibmebus_bus_type);
d7a30103	726	if (err) {
a988c0a6	727	printk(KERN_ERR "%s: failed to register IBM eBus.\n",
e48b1b45	728	__func__);
d7a30103 HS	729	return err;
d7a30103 HS	730	}
a8308800	731
6bccf755	732	err = device_register(&ibmebus_bus_device);
d7a30103	733	if (err) {
a8308800	734	printk(KERN_WARNING "%s: device_register returned %i\n",
e48b1b45	735	__func__, err);
d7a30103 HS	736	bus_unregister(&ibmebus_bus_type);
	737
	738	return err;
	739	}
a8308800	740
1b17adf1	741	err = ibmebus_create_devices(ibmebus_matches);
55347cc9 JF	742	if (err) {
	743	device_unregister(&ibmebus_bus_device);
	744	bus_unregister(&ibmebus_bus_type);
	745	return err;
	746	}
	747
d7a30103 HS	748	return 0;
d7a30103 HS	749	}
a988c0a6	750	postcore_initcall(ibmebus_bus_init);