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Linux/arch/powerpc/sysdev/scom.c

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  1 /*
  2  * Copyright 2010 Benjamin Herrenschmidt, IBM Corp
  3  *                <benh@kernel.crashing.org>
  4  *     and        David Gibson, IBM Corporation.
  5  *
  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.
 10  *
 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.
 15  *
 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
 19  */
 20 
 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>
 26 #include <asm/prom.h>
 27 #include <asm/scom.h>
 28 #include <asm/uaccess.h>
 29 
 30 const struct scom_controller *scom_controller;
 31 EXPORT_SYMBOL_GPL(scom_controller);
 32 
 33 struct device_node *scom_find_parent(struct device_node *node)
 34 {
 35         struct device_node *par, *tmp;
 36         const u32 *p;
 37 
 38         for (par = of_node_get(node); par;) {
 39                 if (of_get_property(par, "scom-controller", NULL))
 40                         break;
 41                 p = of_get_property(par, "scom-parent", NULL);
 42                 tmp = par;
 43                 if (p == NULL)
 44                         par = of_get_parent(par);
 45                 else
 46                         par = of_find_node_by_phandle(*p);
 47                 of_node_put(tmp);
 48         }
 49         return par;
 50 }
 51 EXPORT_SYMBOL_GPL(scom_find_parent);
 52 
 53 scom_map_t scom_map_device(struct device_node *dev, int index)
 54 {
 55         struct device_node *parent;
 56         unsigned int cells, size;
 57         const __be32 *prop, *sprop;
 58         u64 reg, cnt;
 59         scom_map_t ret;
 60 
 61         parent = scom_find_parent(dev);
 62 
 63         if (parent == NULL)
 64                 return 0;
 65 
 66         /*
 67          * We support "scom-reg" properties for adding scom registers
 68          * to a random device-tree node with an explicit scom-parent
 69          *
 70          * We also support the simple "reg" property if the device is
 71          * a direct child of a scom controller.
 72          *
 73          * In case both exist, "scom-reg" takes precedence.
 74          */
 75         prop = of_get_property(dev, "scom-reg", &size);
 76         sprop = of_get_property(parent, "#scom-cells", NULL);
 77         if (!prop && parent == dev->parent) {
 78                 prop = of_get_property(dev, "reg", &size);
 79                 sprop = of_get_property(parent, "#address-cells", NULL);
 80         }
 81         if (!prop)
 82                 return NULL;
 83         cells = sprop ? be32_to_cpup(sprop) : 1;
 84         size >>= 2;
 85 
 86         if (index >= (size / (2*cells)))
 87                 return 0;
 88 
 89         reg = of_read_number(&prop[index * cells * 2], cells);
 90         cnt = of_read_number(&prop[index * cells * 2 + cells], cells);
 91 
 92         ret = scom_map(parent, reg, cnt);
 93         of_node_put(parent);
 94 
 95         return ret;
 96 }
 97 EXPORT_SYMBOL_GPL(scom_map_device);
 98 
 99 #ifdef CONFIG_SCOM_DEBUGFS
100 struct scom_debug_entry {
101         struct device_node *dn;
102         struct debugfs_blob_wrapper path;
103         char name[16];
104 };
105 
106 static ssize_t scom_debug_read(struct file *filp, char __user *ubuf,
107                                size_t count, loff_t *ppos)
108 {
109         struct scom_debug_entry *ent = filp->private_data;
110         u64 __user *ubuf64 = (u64 __user *)ubuf;
111         loff_t off = *ppos;
112         ssize_t done = 0; 
113         u64 reg, reg_cnt, val;
114         scom_map_t map;
115         int rc;
116 
117         if (off < 0 || (off & 7) || (count & 7))
118                 return -EINVAL;
119         reg = off >> 3;
120         reg_cnt = count >> 3;
121 
122         map = scom_map(ent->dn, reg, reg_cnt);
123         if (!scom_map_ok(map))
124                 return -ENXIO;
125 
126         for (reg = 0; reg < reg_cnt; reg++) {
127                 rc = scom_read(map, reg, &val);
128                 if (!rc)
129                         rc = put_user(val, ubuf64);
130                 if (rc) {
131                         if (!done)
132                                 done = rc;
133                         break;
134                 }
135                 ubuf64++;
136                 *ppos += 8;
137                 done += 8;
138         }
139         scom_unmap(map);
140         return done;
141 }
142 
143 static ssize_t scom_debug_write(struct file* filp, const char __user *ubuf,
144                                 size_t count, loff_t *ppos)
145 {
146         struct scom_debug_entry *ent = filp->private_data;
147         u64 __user *ubuf64 = (u64 __user *)ubuf;
148         loff_t off = *ppos;
149         ssize_t done = 0; 
150         u64 reg, reg_cnt, val;
151         scom_map_t map;
152         int rc;
153 
154         if (off < 0 || (off & 7) || (count & 7))
155                 return -EINVAL;
156         reg = off >> 3;
157         reg_cnt = count >> 3;
158 
159         map = scom_map(ent->dn, reg, reg_cnt);
160         if (!scom_map_ok(map))
161                 return -ENXIO;
162 
163         for (reg = 0; reg < reg_cnt; reg++) {
164                 rc = get_user(val, ubuf64);
165                 if (!rc)
166                         rc = scom_write(map, reg,  val);
167                 if (rc) {
168                         if (!done)
169                                 done = rc;
170                         break;
171                 }
172                 ubuf64++;
173                 done += 8;
174         }
175         scom_unmap(map);
176         return done;
177 }
178 
179 static const struct file_operations scom_debug_fops = {
180         .read =         scom_debug_read,
181         .write =        scom_debug_write,
182         .open =         simple_open,
183         .llseek =       default_llseek,
184 };
185 
186 static int scom_debug_init_one(struct dentry *root, struct device_node *dn,
187                                int i)
188 {
189         struct scom_debug_entry *ent;
190         struct dentry *dir;
191 
192         ent = kzalloc(sizeof(*ent), GFP_KERNEL);
193         if (!ent)
194                 return -ENOMEM;
195 
196         ent->dn = of_node_get(dn);
197         snprintf(ent->name, 16, "%08x", i);
198         ent->path.data = (void*) dn->full_name;
199         ent->path.size = strlen(dn->full_name);
200 
201         dir = debugfs_create_dir(ent->name, root);
202         if (!dir) {
203                 of_node_put(dn);
204                 kfree(ent);
205                 return -1;
206         }
207 
208         debugfs_create_blob("devspec", 0400, dir, &ent->path);
209         debugfs_create_file("access", 0600, dir, ent, &scom_debug_fops);
210 
211         return 0;
212 }
213 
214 static int scom_debug_init(void)
215 {
216         struct device_node *dn;
217         struct dentry *root;
218         int i, rc;
219 
220         root = debugfs_create_dir("scom", powerpc_debugfs_root);
221         if (!root)
222                 return -1;
223 
224         i = rc = 0;
225         for_each_node_with_property(dn, "scom-controller") {
226                 int id = of_get_ibm_chip_id(dn);
227                 if (id == -1)
228                         id = i;
229                 rc |= scom_debug_init_one(root, dn, id);
230                 i++;
231         }
232 
233         return rc;
234 }
235 device_initcall(scom_debug_init);
236 #endif /* CONFIG_SCOM_DEBUGFS */
237 

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