![Rob Herring](/assets/img/avatar_default.png)
Now that we have a custom printf format specifier, convert users of full_name to use %pOF instead. This is preparation to remove storing of the full path string for each node. Signed-off-by: Rob Herring <robh@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Anatolij Gustschin <agust@denx.de> Cc: Scott Wood <oss@buserror.net> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: linuxppc-dev@lists.ozlabs.org Reviewed-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
237 lines
5.5 KiB
C
237 lines
5.5 KiB
C
/*
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* Copyright 2010 Benjamin Herrenschmidt, IBM Corp
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* <benh@kernel.crashing.org>
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* and David Gibson, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <asm/debugfs.h>
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#include <asm/prom.h>
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#include <asm/scom.h>
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#include <linux/uaccess.h>
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const struct scom_controller *scom_controller;
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EXPORT_SYMBOL_GPL(scom_controller);
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struct device_node *scom_find_parent(struct device_node *node)
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{
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struct device_node *par, *tmp;
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const u32 *p;
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for (par = of_node_get(node); par;) {
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if (of_get_property(par, "scom-controller", NULL))
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break;
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p = of_get_property(par, "scom-parent", NULL);
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tmp = par;
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if (p == NULL)
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par = of_get_parent(par);
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else
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par = of_find_node_by_phandle(*p);
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of_node_put(tmp);
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}
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return par;
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}
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EXPORT_SYMBOL_GPL(scom_find_parent);
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scom_map_t scom_map_device(struct device_node *dev, int index)
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{
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struct device_node *parent;
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unsigned int cells, size;
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const __be32 *prop, *sprop;
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u64 reg, cnt;
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scom_map_t ret;
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parent = scom_find_parent(dev);
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if (parent == NULL)
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return 0;
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/*
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* We support "scom-reg" properties for adding scom registers
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* to a random device-tree node with an explicit scom-parent
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*
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* We also support the simple "reg" property if the device is
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* a direct child of a scom controller.
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*
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* In case both exist, "scom-reg" takes precedence.
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*/
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prop = of_get_property(dev, "scom-reg", &size);
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sprop = of_get_property(parent, "#scom-cells", NULL);
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if (!prop && parent == dev->parent) {
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prop = of_get_property(dev, "reg", &size);
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sprop = of_get_property(parent, "#address-cells", NULL);
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}
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if (!prop)
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return NULL;
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cells = sprop ? be32_to_cpup(sprop) : 1;
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size >>= 2;
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if (index >= (size / (2*cells)))
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return 0;
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reg = of_read_number(&prop[index * cells * 2], cells);
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cnt = of_read_number(&prop[index * cells * 2 + cells], cells);
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ret = scom_map(parent, reg, cnt);
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of_node_put(parent);
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return ret;
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}
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EXPORT_SYMBOL_GPL(scom_map_device);
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#ifdef CONFIG_SCOM_DEBUGFS
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struct scom_debug_entry {
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struct device_node *dn;
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struct debugfs_blob_wrapper path;
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char name[16];
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};
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static ssize_t scom_debug_read(struct file *filp, char __user *ubuf,
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size_t count, loff_t *ppos)
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{
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struct scom_debug_entry *ent = filp->private_data;
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u64 __user *ubuf64 = (u64 __user *)ubuf;
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loff_t off = *ppos;
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ssize_t done = 0;
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u64 reg, reg_cnt, val;
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scom_map_t map;
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int rc;
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if (off < 0 || (off & 7) || (count & 7))
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return -EINVAL;
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reg = off >> 3;
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reg_cnt = count >> 3;
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map = scom_map(ent->dn, reg, reg_cnt);
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if (!scom_map_ok(map))
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return -ENXIO;
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for (reg = 0; reg < reg_cnt; reg++) {
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rc = scom_read(map, reg, &val);
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if (!rc)
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rc = put_user(val, ubuf64);
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if (rc) {
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if (!done)
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done = rc;
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break;
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}
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ubuf64++;
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*ppos += 8;
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done += 8;
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}
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scom_unmap(map);
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return done;
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}
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static ssize_t scom_debug_write(struct file* filp, const char __user *ubuf,
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size_t count, loff_t *ppos)
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{
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struct scom_debug_entry *ent = filp->private_data;
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u64 __user *ubuf64 = (u64 __user *)ubuf;
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loff_t off = *ppos;
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ssize_t done = 0;
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u64 reg, reg_cnt, val;
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scom_map_t map;
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int rc;
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if (off < 0 || (off & 7) || (count & 7))
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return -EINVAL;
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reg = off >> 3;
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reg_cnt = count >> 3;
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map = scom_map(ent->dn, reg, reg_cnt);
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if (!scom_map_ok(map))
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return -ENXIO;
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for (reg = 0; reg < reg_cnt; reg++) {
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rc = get_user(val, ubuf64);
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if (!rc)
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rc = scom_write(map, reg, val);
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if (rc) {
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if (!done)
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done = rc;
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break;
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}
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ubuf64++;
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done += 8;
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}
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scom_unmap(map);
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return done;
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}
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static const struct file_operations scom_debug_fops = {
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.read = scom_debug_read,
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.write = scom_debug_write,
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.open = simple_open,
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.llseek = default_llseek,
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};
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static int scom_debug_init_one(struct dentry *root, struct device_node *dn,
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int i)
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{
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struct scom_debug_entry *ent;
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struct dentry *dir;
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ent = kzalloc(sizeof(*ent), GFP_KERNEL);
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if (!ent)
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return -ENOMEM;
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ent->dn = of_node_get(dn);
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snprintf(ent->name, 16, "%08x", i);
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ent->path.data = (void*)kasprintf(GFP_KERNEL, "%pOF", dn);
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ent->path.size = strlen((char *)ent->path.data);
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dir = debugfs_create_dir(ent->name, root);
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if (!dir) {
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of_node_put(dn);
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kfree(ent->path.data);
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kfree(ent);
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return -1;
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}
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debugfs_create_blob("devspec", 0400, dir, &ent->path);
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debugfs_create_file("access", 0600, dir, ent, &scom_debug_fops);
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return 0;
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}
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static int scom_debug_init(void)
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{
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struct device_node *dn;
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struct dentry *root;
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int i, rc;
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root = debugfs_create_dir("scom", powerpc_debugfs_root);
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if (!root)
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return -1;
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i = rc = 0;
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for_each_node_with_property(dn, "scom-controller") {
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int id = of_get_ibm_chip_id(dn);
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if (id == -1)
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id = i;
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rc |= scom_debug_init_one(root, dn, id);
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i++;
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}
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return rc;
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}
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device_initcall(scom_debug_init);
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#endif /* CONFIG_SCOM_DEBUGFS */
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