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>
24 #include <linux/export.h>
25 #include <asm/debug.h>
29 const struct scom_controller *scom_controller;
30 EXPORT_SYMBOL_GPL(scom_controller);
32 struct device_node *scom_find_parent(struct device_node *node)
34 struct device_node *par, *tmp;
37 for (par = of_node_get(node); par;) {
38 if (of_get_property(par, "scom-controller", NULL))
40 p = of_get_property(par, "scom-parent", NULL);
43 par = of_get_parent(par);
45 par = of_find_node_by_phandle(*p);
50 EXPORT_SYMBOL_GPL(scom_find_parent);
52 scom_map_t scom_map_device(struct device_node *dev, int index)
54 struct device_node *parent;
55 unsigned int cells, size;
60 parent = scom_find_parent(dev);
65 prop = of_get_property(parent, "#scom-cells", NULL);
66 cells = prop ? *prop : 1;
68 prop = of_get_property(dev, "scom-reg", &size);
73 if (index >= (size / (2*cells)))
76 reg = of_read_number(&prop[index * cells * 2], cells);
77 cnt = of_read_number(&prop[index * cells * 2 + cells], cells);
79 ret = scom_map(parent, reg, cnt);
84 EXPORT_SYMBOL_GPL(scom_map_device);
86 #ifdef CONFIG_SCOM_DEBUGFS
87 struct scom_debug_entry {
88 struct device_node *dn;
93 struct debugfs_blob_wrapper blob;
96 static int scom_addr_set(void *data, u64 val)
98 struct scom_debug_entry *ent = data;
101 scom_unmap(ent->map);
103 ent->map = scom_map(ent->dn, val, 1);
104 if (scom_map_ok(ent->map))
112 static int scom_addr_get(void *data, u64 *val)
114 struct scom_debug_entry *ent = data;
118 DEFINE_SIMPLE_ATTRIBUTE(scom_addr_fops, scom_addr_get, scom_addr_set,
121 static int scom_val_set(void *data, u64 val)
123 struct scom_debug_entry *ent = data;
125 if (!scom_map_ok(ent->map))
128 scom_write(ent->map, 0, val);
133 static int scom_val_get(void *data, u64 *val)
135 struct scom_debug_entry *ent = data;
137 if (!scom_map_ok(ent->map))
140 *val = scom_read(ent->map, 0);
143 DEFINE_SIMPLE_ATTRIBUTE(scom_val_fops, scom_val_get, scom_val_set,
146 static int scom_debug_init_one(struct dentry *root, struct device_node *dn,
149 struct scom_debug_entry *ent;
152 ent = kzalloc(sizeof(*ent), GFP_KERNEL);
156 ent->dn = of_node_get(dn);
157 ent->map = SCOM_MAP_INVALID;
158 spin_lock_init(&ent->lock);
159 snprintf(ent->name, 8, "scom%d", i);
160 ent->blob.data = (void*) dn->full_name;
161 ent->blob.size = strlen(dn->full_name);
163 dir = debugfs_create_dir(ent->name, root);
170 debugfs_create_file("addr", 0600, dir, ent, &scom_addr_fops);
171 debugfs_create_file("value", 0600, dir, ent, &scom_val_fops);
172 debugfs_create_blob("path", 0400, dir, &ent->blob);
177 static int scom_debug_init(void)
179 struct device_node *dn;
183 root = debugfs_create_dir("scom", powerpc_debugfs_root);
188 for_each_node_with_property(dn, "scom-controller")
189 rc |= scom_debug_init_one(root, dn, i++);
193 device_initcall(scom_debug_init);
194 #endif /* CONFIG_SCOM_DEBUGFS */