Benjamin Herrenschmidt | ab814b9 | 2011-04-14 22:31:58 +0000 | [diff] [blame] | 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> |
Paul Gortmaker | 66b15db | 2011-05-27 10:46:24 -0400 | [diff] [blame] | 24 | #include <linux/export.h> |
Benjamin Herrenschmidt | ab814b9 | 2011-04-14 22:31:58 +0000 | [diff] [blame] | 25 | #include <asm/prom.h> |
| 26 | #include <asm/scom.h> |
| 27 | |
| 28 | const struct scom_controller *scom_controller; |
| 29 | EXPORT_SYMBOL_GPL(scom_controller); |
| 30 | |
| 31 | struct device_node *scom_find_parent(struct device_node *node) |
| 32 | { |
| 33 | struct device_node *par, *tmp; |
| 34 | const u32 *p; |
| 35 | |
| 36 | for (par = of_node_get(node); par;) { |
| 37 | if (of_get_property(par, "scom-controller", NULL)) |
| 38 | break; |
| 39 | p = of_get_property(par, "scom-parent", NULL); |
| 40 | tmp = par; |
| 41 | if (p == NULL) |
| 42 | par = of_get_parent(par); |
| 43 | else |
| 44 | par = of_find_node_by_phandle(*p); |
| 45 | of_node_put(tmp); |
| 46 | } |
| 47 | return par; |
| 48 | } |
| 49 | EXPORT_SYMBOL_GPL(scom_find_parent); |
| 50 | |
| 51 | scom_map_t scom_map_device(struct device_node *dev, int index) |
| 52 | { |
| 53 | struct device_node *parent; |
| 54 | unsigned int cells, size; |
| 55 | const u32 *prop; |
| 56 | u64 reg, cnt; |
| 57 | scom_map_t ret; |
| 58 | |
| 59 | parent = scom_find_parent(dev); |
| 60 | |
| 61 | if (parent == NULL) |
| 62 | return 0; |
| 63 | |
| 64 | prop = of_get_property(parent, "#scom-cells", NULL); |
| 65 | cells = prop ? *prop : 1; |
| 66 | |
| 67 | prop = of_get_property(dev, "scom-reg", &size); |
| 68 | if (!prop) |
| 69 | return 0; |
| 70 | size >>= 2; |
| 71 | |
| 72 | if (index >= (size / (2*cells))) |
| 73 | return 0; |
| 74 | |
| 75 | reg = of_read_number(&prop[index * cells * 2], cells); |
| 76 | cnt = of_read_number(&prop[index * cells * 2 + cells], cells); |
| 77 | |
| 78 | ret = scom_map(parent, reg, cnt); |
| 79 | of_node_put(parent); |
| 80 | |
| 81 | return ret; |
| 82 | } |
| 83 | EXPORT_SYMBOL_GPL(scom_map_device); |
| 84 | |
| 85 | #ifdef CONFIG_SCOM_DEBUGFS |
| 86 | struct scom_debug_entry { |
| 87 | struct device_node *dn; |
| 88 | unsigned long addr; |
| 89 | scom_map_t map; |
| 90 | spinlock_t lock; |
| 91 | char name[8]; |
| 92 | struct debugfs_blob_wrapper blob; |
| 93 | }; |
| 94 | |
| 95 | static int scom_addr_set(void *data, u64 val) |
| 96 | { |
| 97 | struct scom_debug_entry *ent = data; |
| 98 | |
| 99 | ent->addr = 0; |
| 100 | scom_unmap(ent->map); |
| 101 | |
| 102 | ent->map = scom_map(ent->dn, val, 1); |
| 103 | if (scom_map_ok(ent->map)) |
| 104 | ent->addr = val; |
| 105 | else |
| 106 | return -EFAULT; |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | static int scom_addr_get(void *data, u64 *val) |
| 112 | { |
| 113 | struct scom_debug_entry *ent = data; |
| 114 | *val = ent->addr; |
| 115 | return 0; |
| 116 | } |
| 117 | DEFINE_SIMPLE_ATTRIBUTE(scom_addr_fops, scom_addr_get, scom_addr_set, |
| 118 | "0x%llx\n"); |
| 119 | |
| 120 | static int scom_val_set(void *data, u64 val) |
| 121 | { |
| 122 | struct scom_debug_entry *ent = data; |
| 123 | |
| 124 | if (!scom_map_ok(ent->map)) |
| 125 | return -EFAULT; |
| 126 | |
| 127 | scom_write(ent->map, 0, val); |
| 128 | |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | static int scom_val_get(void *data, u64 *val) |
| 133 | { |
| 134 | struct scom_debug_entry *ent = data; |
| 135 | |
| 136 | if (!scom_map_ok(ent->map)) |
| 137 | return -EFAULT; |
| 138 | |
| 139 | *val = scom_read(ent->map, 0); |
| 140 | return 0; |
| 141 | } |
| 142 | DEFINE_SIMPLE_ATTRIBUTE(scom_val_fops, scom_val_get, scom_val_set, |
| 143 | "0x%llx\n"); |
| 144 | |
| 145 | static int scom_debug_init_one(struct dentry *root, struct device_node *dn, |
| 146 | int i) |
| 147 | { |
| 148 | struct scom_debug_entry *ent; |
| 149 | struct dentry *dir; |
| 150 | |
| 151 | ent = kzalloc(sizeof(*ent), GFP_KERNEL); |
| 152 | if (!ent) |
| 153 | return -ENOMEM; |
| 154 | |
| 155 | ent->dn = of_node_get(dn); |
| 156 | ent->map = SCOM_MAP_INVALID; |
| 157 | spin_lock_init(&ent->lock); |
| 158 | snprintf(ent->name, 8, "scom%d", i); |
| 159 | ent->blob.data = dn->full_name; |
| 160 | ent->blob.size = strlen(dn->full_name); |
| 161 | |
| 162 | dir = debugfs_create_dir(ent->name, root); |
| 163 | if (!dir) { |
| 164 | of_node_put(dn); |
| 165 | kfree(ent); |
| 166 | return -1; |
| 167 | } |
| 168 | |
| 169 | debugfs_create_file("addr", 0600, dir, ent, &scom_addr_fops); |
| 170 | debugfs_create_file("value", 0600, dir, ent, &scom_val_fops); |
| 171 | debugfs_create_blob("path", 0400, dir, &ent->blob); |
| 172 | |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | static int scom_debug_init(void) |
| 177 | { |
| 178 | struct device_node *dn; |
| 179 | struct dentry *root; |
| 180 | int i, rc; |
| 181 | |
| 182 | root = debugfs_create_dir("scom", powerpc_debugfs_root); |
| 183 | if (!root) |
| 184 | return -1; |
| 185 | |
| 186 | i = rc = 0; |
| 187 | for_each_node_with_property(dn, "scom-controller") |
| 188 | rc |= scom_debug_init_one(root, dn, i++); |
| 189 | |
| 190 | return rc; |
| 191 | } |
| 192 | device_initcall(scom_debug_init); |
| 193 | #endif /* CONFIG_SCOM_DEBUGFS */ |