2 * Copyright 2010 Benjamin Herrenschmidt, IBM Corp
3 * <benh@kernel.crashing.org>
4 * and David Gibson, IBM Corporation.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
14 * the GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <linux/kernel.h>
22 #include <linux/debugfs.h>
23 #include <linux/slab.h>
27 const struct scom_controller *scom_controller;
28 EXPORT_SYMBOL_GPL(scom_controller);
30 struct device_node *scom_find_parent(struct device_node *node)
32 struct device_node *par, *tmp;
35 for (par = of_node_get(node); par;) {
36 if (of_get_property(par, "scom-controller", NULL))
38 p = of_get_property(par, "scom-parent", NULL);
41 par = of_get_parent(par);
43 par = of_find_node_by_phandle(*p);
48 EXPORT_SYMBOL_GPL(scom_find_parent);
50 scom_map_t scom_map_device(struct device_node *dev, int index)
52 struct device_node *parent;
53 unsigned int cells, size;
58 parent = scom_find_parent(dev);
63 prop = of_get_property(parent, "#scom-cells", NULL);
64 cells = prop ? *prop : 1;
66 prop = of_get_property(dev, "scom-reg", &size);
71 if (index >= (size / (2*cells)))
74 reg = of_read_number(&prop[index * cells * 2], cells);
75 cnt = of_read_number(&prop[index * cells * 2 + cells], cells);
77 ret = scom_map(parent, reg, cnt);
82 EXPORT_SYMBOL_GPL(scom_map_device);
84 #ifdef CONFIG_SCOM_DEBUGFS
85 struct scom_debug_entry {
86 struct device_node *dn;
91 struct debugfs_blob_wrapper blob;
94 static int scom_addr_set(void *data, u64 val)
96 struct scom_debug_entry *ent = data;
101 ent->map = scom_map(ent->dn, val, 1);
102 if (scom_map_ok(ent->map))
110 static int scom_addr_get(void *data, u64 *val)
112 struct scom_debug_entry *ent = data;
116 DEFINE_SIMPLE_ATTRIBUTE(scom_addr_fops, scom_addr_get, scom_addr_set,
119 static int scom_val_set(void *data, u64 val)
121 struct scom_debug_entry *ent = data;
123 if (!scom_map_ok(ent->map))
126 scom_write(ent->map, 0, val);
131 static int scom_val_get(void *data, u64 *val)
133 struct scom_debug_entry *ent = data;
135 if (!scom_map_ok(ent->map))
138 *val = scom_read(ent->map, 0);
141 DEFINE_SIMPLE_ATTRIBUTE(scom_val_fops, scom_val_get, scom_val_set,
144 static int scom_debug_init_one(struct dentry *root, struct device_node *dn,
147 struct scom_debug_entry *ent;
150 ent = kzalloc(sizeof(*ent), GFP_KERNEL);
154 ent->dn = of_node_get(dn);
155 ent->map = SCOM_MAP_INVALID;
156 spin_lock_init(&ent->lock);
157 snprintf(ent->name, 8, "scom%d", i);
158 ent->blob.data = dn->full_name;
159 ent->blob.size = strlen(dn->full_name);
161 dir = debugfs_create_dir(ent->name, root);
168 debugfs_create_file("addr", 0600, dir, ent, &scom_addr_fops);
169 debugfs_create_file("value", 0600, dir, ent, &scom_val_fops);
170 debugfs_create_blob("path", 0400, dir, &ent->blob);
175 static int scom_debug_init(void)
177 struct device_node *dn;
181 root = debugfs_create_dir("scom", powerpc_debugfs_root);
186 for_each_node_with_property(dn, "scom-controller")
187 rc |= scom_debug_init_one(root, dn, i++);
191 device_initcall(scom_debug_init);
192 #endif /* CONFIG_SCOM_DEBUGFS */