1 // SPDX-License-Identifier: GPL-2.0-or-later
30 	 * its form.  Bits 4-11 are always 0.  in opal_scom_unmangle()
34 	 * of the 64-bit address, and thus cannot use the indirect bit.  in opal_scom_unmangle()
37 	 * bits 4-7 (IBM notation) instead of bit 0-3 in this API, we  in opal_scom_unmangle()
40 	 * For in-kernel use, we don't need to do this mangling.  In  in opal_scom_unmangle()
41 	 * kernel won't have bits 4-7 set.  in opal_scom_unmangle()
44 	 *   debugfs will always   set 0-3 = 0 and clear 4-7  in opal_scom_unmangle()
45 	 *    kernel will always clear 0-3 = 0 and   set 4-7  in opal_scom_unmangle()
55 static int opal_scom_read(uint32_t chip, uint64_t addr, u64 reg, u64 *value)  in opal_scom_read()  argument
61 	rc = opal_xscom_read(chip, reg, (__be64 *)__pa(&v));  in opal_scom_read()
64 		return -EIO;  in opal_scom_read()
70 static int opal_scom_write(uint32_t chip, uint64_t addr, u64 reg, u64 value)  in opal_scom_write()  argument
75 	rc = opal_xscom_write(chip, reg, value);  in opal_scom_write()
77 		return -EIO;  in opal_scom_write()
82 	u32 chip;  member
90 	struct scom_debug_entry *ent = filp->private_data;  in scom_debug_read()
92 	loff_t off = *ppos;  in scom_debug_read()  local
97 	if (off < 0 || (off & 7) || (count & 7))  in scom_debug_read()
98 		return -EINVAL;  in scom_debug_read()
99 	reg_base = off >> 3;  in scom_debug_read()
103 		rc = opal_scom_read(ent->chip, reg_base, reg, &val);  in scom_debug_read()
121 	struct scom_debug_entry *ent = filp->private_data;  in scom_debug_write()
123 	loff_t off = *ppos;  in scom_debug_write()  local
128 	if (off < 0 || (off & 7) || (count & 7))  in scom_debug_write()
129 		return -EINVAL;  in scom_debug_write()
130 	reg_base = off >> 3;  in scom_debug_write()
136 			rc = opal_scom_write(ent->chip, reg_base, reg,  val);  in scom_debug_write()
156 			       int chip)  in scom_debug_init_one()  argument
163 		return -ENOMEM;  in scom_debug_init_one()
165 	ent->chip = chip;  in scom_debug_init_one()
166 	snprintf(ent->name, 16, "%08x", chip);  in scom_debug_init_one()
167 	ent->path.data = (void *)kasprintf(GFP_KERNEL, "%pOF", dn);  in scom_debug_init_one()
168 	if (!ent->path.data) {  in scom_debug_init_one()
170 		return -ENOMEM;  in scom_debug_init_one()
173 	ent->path.size = strlen((char *)ent->path.data);  in scom_debug_init_one()
175 	dir = debugfs_create_dir(ent->name, root);  in scom_debug_init_one()
177 		kfree(ent->path.data);  in scom_debug_init_one()
179 		return -1;  in scom_debug_init_one()
182 	debugfs_create_blob("devspec", 0400, dir, &ent->path);  in scom_debug_init_one()
192 	int chip, rc;  in scom_debug_init()  local
199 		return -1;  in scom_debug_init()
202 	for_each_node_with_property(dn, "scom-controller") {  in scom_debug_init()
203 		chip = of_get_ibm_chip_id(dn);  in scom_debug_init()
204 		WARN_ON(chip == -1);  in scom_debug_init()
205 		rc |= scom_debug_init_one(root, dn, chip);  in scom_debug_init()