/* * 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 <linux/export.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_DEBUGFSstruct 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 */