/*
* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
* <benh@kernel.crashing.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#undef DEBUG
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <asm/errno.h>
#include <asm/dcr.h>
#include <asm/of_device.h>
#include <asm/of_platform.h>
#include <asm/topology.h>
/*
* The list of OF IDs below is used for matching bus types in the
* system whose devices are to be exposed as of_platform_devices.
*
* This is the default list valid for most platforms. This file provides
* functions who can take an explicit list if necessary though
*
* The search is always performed recursively looking for children of
* the provided device_node and recursively if such a children matches
* a bus type in the list
*/
static struct of_device_id of_default_bus_ids[] = {
{ .type = "soc", },
{ .compatible = "soc", },
{ .type = "spider", },
{ .type = "axon", },
{ .type = "plb5", },
{ .type = "plb4", },
{ .type = "opb", },
{},
};
/*
*
* OF platform device type definition & base infrastructure
*
*/
static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
{
struct of_device * of_dev = to_of_device(dev);
struct of_platform_driver * of_drv = to_of_platform_driver(drv);
const struct of_device_id * matches = of_drv->match_table;
if (!matches)
return 0;
return of_match_device(matches, of_dev) != NULL;
}
static int of_platform_device_probe(struct device *dev)
{
int error = -ENODEV;
struct of_platform_driver *drv;
struct of_device *of_dev;
const struct of_device_id *match;
drv = to_of_platform_driver(dev->driver);
of_dev = to_of_device(dev);
if (!drv->probe)
return error;
of_dev_get(of_dev);
match = of_match_device(drv->match_table, of_dev);
if (match)
error = drv->probe(of_dev, match);
if (error)
of_dev_put(of_dev);
return error;
}
static int of_platform_device_remove(struct device *dev)
{
struct of_device * of_dev = to_of_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 int of_platform_device_suspend(struct device *dev, pm_message_t state)
{
struct of_device * of_dev = to_of_device(dev);
struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
int error = 0;
if (dev->driver && drv->suspend)
error = drv->suspend(of_dev, state);
return error;
}
static int of_platform_device_resume(struct device * dev)
{
struct of_device * of_dev = to_of_device(dev);
struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
int error = 0;
if (dev->driver && drv->resume)
error = drv->resume(of_dev);
return error;
}
struct bus_type of_platform_bus_type = {
.name = "of_platform",
.match = of_platform_bus_match,
.probe = of_platform_device_probe,
.remove = of_platform_device_remove,
.suspend = of_platform_device_suspend,
.resume = of_platform_device_resume,
};
EXPORT_SYMBOL(of_platform_bus_type);
static int __init of_bus_driver_init(void)
{
return bus_register(&of_platform_bus_type);
}
postcore_initcall(of_bus_driver_init);
int of_register_platform_driver(struct of_platform_driver *drv)
{
/* initialize common driver fields */
drv->driver.name = drv->name;
drv->driver.bus = &of_platform_bus_type;
/* register with core */
return driver_register(&drv->driver);
}
EXPORT_SYMBOL(of_register_platform_driver);
void of_unregister_platform_driver(struct of_platform_driver *drv)
{
driver_unregister(&drv->driver);
}
EXPORT_SYMBOL(of_unregister_platform_driver);
static void of_platform_make_bus_id(struct of_device *dev)
{
struct device_node *node = dev->node;
char *name = dev->dev.bus_id;
const u32 *reg;
u64 addr;
/*
* If it's a DCR based device, use 'd' for native DCRs
* and 'D' for MMIO DCRs.
*/
#ifdef CONFIG_PPC_DCR
reg = get_property(node, "dcr-reg", NULL);
if (reg) {
#ifdef CONFIG_PPC_DCR_NATIVE
snprintf(name, BUS_ID_SIZE, "d%x.%s",
*reg, node->name);
#else /* CONFIG_PPC_DCR_NATIVE */
addr = of_translate_dcr_address(node, *reg, NULL);
if (addr != OF_BAD_ADDR) {
snprintf(name, BUS_ID_SIZE,
"D%llx.%s", (unsigned long long)addr,
node->name);
return;
}
#endif /* !CONFIG_PPC_DCR_NATIVE */
}
#endif /* CONFIG_PPC_DCR */
/*
* For MMIO, get the physical address
*/
reg = get_property(node, "reg", NULL);
if (reg) {
addr = of_translate_address(node, reg);
if (addr != OF_BAD_ADDR) {
snprintf(name, BUS_ID_SIZE,
"%llx.%s", (unsigned long long)addr,
node->name);
return;
}
}
/*
* No BusID, use the node name and pray
*/
snprintf(name, BUS_ID_SIZE, "%s", node->name);
}
struct of_device* of_platform_device_create(struct device_node *np,
const char *bus_id,
struct device *parent)
{
struct of_device *dev;
dev = kmalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return NULL;
memset(dev, 0, sizeof(*dev));
dev->node = of_node_get(np);
dev->dma_mask = 0xffffffffUL;
dev->dev.dma_mask = &dev->dma_mask;
dev->dev.parent = parent;
dev->dev.bus = &of_platform_bus_type;
dev->dev.release = of_release_dev;
dev->dev.archdata.of_node = np;
dev->dev.archdata.numa_node = of_node_to_nid(np);
/* We do not fill the DMA ops for platform devices by default.
* This is currently the responsibility of the platform code
* to do such, possibly using a device notifier
*/
if (bus_id)
strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
else
of_platform_make_bus_id(dev);
if (of_device_register(dev) != 0) {
kfree(dev);
return NULL;
}
return dev;
}
EXPORT_SYMBOL(of_platform_device_create);
/**
* of_platform_bus_create - Create an OF device for a bus node and all its
* children. Optionally recursively instanciate matching busses.
* @bus: device node of the bus to instanciate
* @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
* disallow recursive creation of child busses
*/
static int of_platform_bus_create(struct device_node *bus,
struct of_device_id *matches,
struct device *parent)
{
struct device_node *child;
struct of_device *dev;
int rc = 0;
for (child = NULL; (child = of_get_next_child(bus, child)); ) {
pr_debug(" create child: %s\n", child->full_name);
dev = of_platform_device_create(child, NULL, parent);
if (dev == NULL)
rc = -ENOMEM;
else if (!of_match_node(matches, child))
continue;
if (rc == 0) {
pr_debug(" and sub busses\n");
rc = of_platform_bus_create(child, matches, &dev->dev);
} if (rc) {
of_node_put(child);
break;
}
}
return rc;
}
/**
* of_platform_bus_probe - Probe the device-tree for platform busses
* @root: parent of the first level to probe or NULL for the root of the tree
* @matches: match table, NULL to use the default
* @parent: parent to hook devices from, NULL for toplevel
*
* Note that children of the provided root are not instanciated as devices
* unless the specified root itself matches the bus list and is not NULL.
*/
int of_platform_bus_probe(struct device_node *root,
struct of_device_id *matches,
struct device *parent)
{
struct device_node *child;
struct of_device *dev;
int rc = 0;
if (matches == NULL)
matches = of_default_bus_ids;
if (matches == OF_NO_DEEP_PROBE)
return -EINVAL;
if (root == NULL)
root = of_find_node_by_path("/");
else
of_node_get(root);
pr_debug("of_platform_bus_probe()\n");
pr_debug(" starting at: %s\n", root->full_name);
/* Do a self check of bus type, if there's a match, create
* children
*/
if (of_match_node(matches, root)) {
pr_debug(" root match, create all sub devices\n");
dev = of_platform_device_create(root, NULL, parent);
if (dev == NULL) {
rc = -ENOMEM;
goto bail;
}
pr_debug(" create all sub busses\n");
rc = of_platform_bus_create(root, matches, &dev->dev);
goto bail;
}
for (child = NULL; (child = of_get_next_child(root, child)); ) {
if (!of_match_node(matches, child))
continue;
pr_debug(" match: %s\n", child->full_name);
dev = of_platform_device_create(child, NULL, parent);
if (dev == NULL)
rc = -ENOMEM;
else
rc = of_platform_bus_create(child, matches, &dev->dev);
if (rc) {
of_node_put(child);
break;
}
}
bail:
of_node_put(root);
return rc;
}
EXPORT_SYMBOL(of_platform_bus_probe);
static int of_dev_node_match(struct device *dev, void *data)
{
return to_of_device(dev)->node == data;
}
struct of_device *of_find_device_by_node(struct device_node *np)
{
struct device *dev;
dev = bus_find_device(&of_platform_bus_type,
NULL, np, of_dev_node_match);
if (dev)
return to_of_device(dev);
return NULL;
}
EXPORT_SYMBOL(of_find_device_by_node);
static int of_dev_phandle_match(struct device *dev, void *data)
{
phandle *ph = data;
return to_of_device(dev)->node->linux_phandle == *ph;
}
struct of_device *of_find_device_by_phandle(phandle ph)
{
struct device *dev;
dev = bus_find_device(&of_platform_bus_type,
NULL, &ph, of_dev_phandle_match);
if (dev)
return to_of_device(dev);
return NULL;
}
EXPORT_SYMBOL(of_find_device_by_phandle);
