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/* Iterate over device tree topology, breadth or depth-first
*
* COPYRIGHT (c) 2009 Cobham Gaisler AB.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <string.h>
#include <drvmgr/drvmgr.h>
#include <drvmgr/drvmgr_list.h>
#include "drvmgr_internal.h"
/* Traverse device tree breadth-first. Supports up to 31 buses */
static int drvmgr_for_each_dev_breadth(
int (*func)(struct drvmgr_dev *dev, void *arg),
void *arg
)
{
int ret = 0, i, pos;
struct drvmgr_bus *bus, *buses[32];
struct drvmgr_dev *dev;
pos = 0;
memset(&buses[0], 0, sizeof(buses));
buses[pos++] = drvmgr.root_dev.bus; /* Get root bus */
for (i = 0, bus = buses[0]; buses[i]; i++, bus = buses[i]) {
dev = bus->children;
while (dev) {
ret = func(dev, arg);
if (ret != 0)
break;
if (dev->bus && pos < 31)
buses[pos++] = dev->bus;
dev = dev->next_in_bus;
}
}
return ret;
}
/* Traverse device tree depth-first. */
static int drvmgr_for_each_dev_depth(
int (*func)(struct drvmgr_dev *dev, void *arg),
void *arg
)
{
int ret = 0;
struct drvmgr_dev *dev;
/* Get first device */
dev = drvmgr.root_dev.bus->children;
while (dev) {
ret = func(dev, arg);
if (ret != 0)
break;
if (dev->bus && dev->bus->children) {
dev = dev->bus->children;
} else {
next_dev:
if (dev->next_in_bus == NULL) {
/* Step up one level... back to parent bus */
dev = dev->parent->dev;
if (dev == &drvmgr.root_dev)
break;
goto next_dev;
} else {
dev = dev->next_in_bus;
}
}
}
return ret;
}
/* Traverse device tree depth-first or breadth-first */
int drvmgr_for_each_dev(
int (*func)(struct drvmgr_dev *dev, void *arg),
void *arg,
int options
)
{
int ret;
DRVMGR_LOCK_READ();
/* Get Root Device */
if (drvmgr.root_dev.bus->children != NULL) {
if (options & DRVMGR_FED_BF)
ret = drvmgr_for_each_dev_breadth(func, arg);
else
ret = drvmgr_for_each_dev_depth(func, arg);
} else
ret = 0;
DRVMGR_UNLOCK();
return ret;
}
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