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authorJoachim Fenkes <fenkes@de.ibm.com>2007-09-26 19:45:21 +1000
committerPaul Mackerras <paulus@samba.org>2007-10-17 22:30:08 +1000
commit55347cc9962fbf2048a3cf78e92c3f52035ac524 (patch)
tree584f473e33bb68198a1cd8aa6f2b50e657aed321 /arch
parenta988c0a627ee654b4d692570572567aec06c3e13 (diff)
[POWERPC] ibmebus: Add device creation and bus probing based on of_device
The devtree root is now searched for devices matching a built-in whitelist during boot, so these devices appear on the bus from the beginning. It is still possible to manually add/remove devices to/from the bus by using the probe/remove sysfs interface. Also, when a device driver registers itself, the devtree is matched against its matchlist. Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/ibmebus.c100
1 files changed, 82 insertions, 18 deletions
diff --git a/arch/powerpc/kernel/ibmebus.c b/arch/powerpc/kernel/ibmebus.c
index af21306e2ef..d21658140b6 100644
--- a/arch/powerpc/kernel/ibmebus.c
+++ b/arch/powerpc/kernel/ibmebus.c
@@ -51,6 +51,13 @@ static struct device ibmebus_bus_device = { /* fake "parent" device */
struct bus_type ibmebus_bus_type;
+/* These devices will automatically be added to the bus during init */
+static struct of_device_id builtin_matches[] = {
+ { .compatible = "IBM,lhca" },
+ { .compatible = "IBM,lhea" },
+ {},
+};
+
static void *ibmebus_alloc_coherent(struct device *dev,
size_t size,
dma_addr_t *dma_handle,
@@ -125,6 +132,67 @@ static struct dma_mapping_ops ibmebus_dma_ops = {
.dma_supported = ibmebus_dma_supported,
};
+static int ibmebus_match_path(struct device *dev, void *data)
+{
+ struct device_node *dn = to_of_device(dev)->node;
+ return (dn->full_name &&
+ (strcasecmp((char *)data, dn->full_name) == 0));
+}
+
+static int ibmebus_match_node(struct device *dev, void *data)
+{
+ return to_of_device(dev)->node == data;
+}
+
+static int ibmebus_create_device(struct device_node *dn)
+{
+ struct of_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_register(dev);
+ if (ret) {
+ of_device_free(dev);
+ return ret;
+ }
+
+ return 0;
+}
+
+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 (child = NULL; (child = of_get_next_child(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)",
+ __FUNCTION__, ret);
+ of_node_put(child);
+ break;
+ }
+ }
+
+ of_node_put(root);
+ return ret;
+}
+
int ibmebus_register_driver(struct ibmebus_driver *drv)
{
return 0;
@@ -173,18 +241,6 @@ static struct device_attribute ibmebus_dev_attrs[] = {
__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);
@@ -204,9 +260,8 @@ 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;
+ ssize_t rc = 0;
path = ibmebus_chomp(buf, count);
if (!path)
@@ -221,9 +276,8 @@ static ssize_t ibmebus_store_probe(struct bus_type *bus,
}
if ((dn = of_find_node_by_path(path))) {
-/* dev = ibmebus_register_device_node(dn); */
+ rc = ibmebus_create_device(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);
@@ -232,7 +286,9 @@ static ssize_t ibmebus_store_probe(struct bus_type *bus,
out:
kfree(path);
- return rc;
+ if (rc)
+ return rc;
+ return count;
}
static ssize_t ibmebus_store_remove(struct bus_type *bus,
@@ -247,7 +303,7 @@ static ssize_t ibmebus_store_remove(struct bus_type *bus,
if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
ibmebus_match_path))) {
-/* ibmebus_unregister_device(dev); */
+ of_device_unregister(to_of_device(dev));
kfree(path);
return count;
@@ -267,6 +323,7 @@ static struct bus_attribute ibmebus_bus_attrs[] = {
};
struct bus_type ibmebus_bus_type = {
+ .uevent = of_device_uevent,
.dev_attrs = ibmebus_dev_attrs,
.bus_attrs = ibmebus_bus_attrs
};
@@ -294,6 +351,13 @@ static int __init ibmebus_bus_init(void)
return err;
}
+ err = ibmebus_create_devices(builtin_matches);
+ if (err) {
+ device_unregister(&ibmebus_bus_device);
+ bus_unregister(&ibmebus_bus_type);
+ return err;
+ }
+
return 0;
}
postcore_initcall(ibmebus_bus_init);