1 files changed, 192 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/scom.c b/arch/powerpc/sysdev/scom.c
new file mode 100644
index 000000000000..b2593ce30c9b
--- /dev/null
+++ b/arch/powerpc/sysdev/scom.c
@@ -0,0 +1,192 @@
+/*
+ * Copyright 2010 Benjamin Herrenschmidt, IBM Corp
+ *                <benh@kernel.crashing.org>
+ *     and        David Gibson, IBM Corporation.
+ *
+ *   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.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ *   the GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program;  if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/debugfs.h>
+#include <linux/slab.h>
+#include <asm/prom.h>
+#include <asm/scom.h>
+
+const struct scom_controller *scom_controller;
+EXPORT_SYMBOL_GPL(scom_controller);
+
+struct device_node *scom_find_parent(struct device_node *node)
+{
+        struct device_node *par, *tmp;
+        const u32 *p;
+
+        for (par = of_node_get(node); par;) {
+                if (of_get_property(par, "scom-controller", NULL))
+                        break;
+                p = of_get_property(par, "scom-parent", NULL);
+                tmp = par;
+                if (p == NULL)
+                        par = of_get_parent(par);
+                else
+                        par = of_find_node_by_phandle(*p);
+                of_node_put(tmp);
+        }
+        return par;
+}
+EXPORT_SYMBOL_GPL(scom_find_parent);
+
+scom_map_t scom_map_device(struct device_node *dev, int index)
+{
+        struct device_node *parent;
+        unsigned int cells, size;
+        const u32 *prop;
+        u64 reg, cnt;
+        scom_map_t ret;
+
+        parent = scom_find_parent(dev);
+
+        if (parent == NULL)
+                return 0;
+
+        prop = of_get_property(parent, "#scom-cells", NULL);
+        cells = prop ? *prop : 1;
+
+        prop = of_get_property(dev, "scom-reg", &size);
+        if (!prop)
+                return 0;
+        size >>= 2;
+
+        if (index >= (size / (2*cells)))
+                return 0;
+
+        reg = of_read_number(&prop[index * cells * 2], cells);
+        cnt = of_read_number(&prop[index * cells * 2 + cells], cells);
+
+        ret = scom_map(parent, reg, cnt);
+        of_node_put(parent);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(scom_map_device);
+
+#ifdef CONFIG_SCOM_DEBUGFS
+struct scom_debug_entry {
+        struct device_node *dn;
+        unsigned long addr;
+        scom_map_t map;
+        spinlock_t lock;
+        char name[8];
+        struct debugfs_blob_wrapper blob;
+};
+
+static int scom_addr_set(void *data, u64 val)
+{
+        struct scom_debug_entry *ent = data;
+
+        ent->addr = 0;
+        scom_unmap(ent->map);
+
+        ent->map = scom_map(ent->dn, val, 1);
+        if (scom_map_ok(ent->map))
+                ent->addr = val;
+        else
+                return -EFAULT;
+
+        return 0;
+}
+
+static int scom_addr_get(void *data, u64 *val)
+{
+        struct scom_debug_entry *ent = data;
+        *val = ent->addr;
+        return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(scom_addr_fops, scom_addr_get, scom_addr_set,
+                        "0x%llx\n");
+
+static int scom_val_set(void *data, u64 val)
+{
+        struct scom_debug_entry *ent = data;
+
+        if (!scom_map_ok(ent->map))
+                return -EFAULT;
+
+        scom_write(ent->map, 0, val);
+
+        return 0;
+}
+
+static int scom_val_get(void *data, u64 *val)
+{
+        struct scom_debug_entry *ent = data;
+
+        if (!scom_map_ok(ent->map))
+                return -EFAULT;
+
+        *val = scom_read(ent->map, 0);
+        return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(scom_val_fops, scom_val_get, scom_val_set,
+                        "0x%llx\n");
+
+static int scom_debug_init_one(struct dentry *root, struct device_node *dn,
+                               int i)
+{
+        struct scom_debug_entry *ent;
+        struct dentry *dir;
+
+        ent = kzalloc(sizeof(*ent), GFP_KERNEL);
+        if (!ent)
+                return -ENOMEM;
+
+        ent->dn = of_node_get(dn);
+        ent->map = SCOM_MAP_INVALID;
+        spin_lock_init(&ent->lock);
+        snprintf(ent->name, 8, "scom%d", i);
+        ent->blob.data = dn->full_name;
+        ent->blob.size = strlen(dn->full_name);
+
+        dir = debugfs_create_dir(ent->name, root);
+        if (!dir) {
+                of_node_put(dn);
+                kfree(ent);
+                return -1;
+        }
+
+        debugfs_create_file("addr", 0600, dir, ent, &scom_addr_fops);
+        debugfs_create_file("value", 0600, dir, ent, &scom_val_fops);
+        debugfs_create_blob("path", 0400, dir, &ent->blob);
+
+        return 0;
+}
+
+static int scom_debug_init(void)
+{
+        struct device_node *dn;
+        struct dentry *root;
+        int i, rc;
+
+        root = debugfs_create_dir("scom", powerpc_debugfs_root);
+        if (!root)
+                return -1;
+
+        i = rc = 0;
+        for_each_node_with_property(dn, "scom-controller")
+                rc |= scom_debug_init_one(root, dn, i++);
+
+        return rc;
+}
+device_initcall(scom_debug_init);
+#endif /* CONFIG_SCOM_DEBUGFS */