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-rw-r--r--arch/powerpc/sysdev/scom.c223
1 files changed, 0 insertions, 223 deletions
diff --git a/arch/powerpc/sysdev/scom.c b/arch/powerpc/sysdev/scom.c
deleted file mode 100644
index 94e885bf3aee..000000000000
--- a/arch/powerpc/sysdev/scom.c
+++ /dev/null
@@ -1,223 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright 2010 Benjamin Herrenschmidt, IBM Corp
- * <benh@kernel.crashing.org>
- * and David Gibson, IBM Corporation.
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/export.h>
-#include <asm/debugfs.h>
-#include <asm/prom.h>
-#include <asm/scom.h>
-#include <linux/uaccess.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 __be32 *prop, *sprop;
- u64 reg, cnt;
- scom_map_t ret;
-
- parent = scom_find_parent(dev);
-
- if (parent == NULL)
- return NULL;
-
- /*
- * We support "scom-reg" properties for adding scom registers
- * to a random device-tree node with an explicit scom-parent
- *
- * We also support the simple "reg" property if the device is
- * a direct child of a scom controller.
- *
- * In case both exist, "scom-reg" takes precedence.
- */
- prop = of_get_property(dev, "scom-reg", &size);
- sprop = of_get_property(parent, "#scom-cells", NULL);
- if (!prop && parent == dev->parent) {
- prop = of_get_property(dev, "reg", &size);
- sprop = of_get_property(parent, "#address-cells", NULL);
- }
- if (!prop)
- return NULL;
- cells = sprop ? be32_to_cpup(sprop) : 1;
- size >>= 2;
-
- if (index >= (size / (2*cells)))
- return NULL;
-
- 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_DEBUGFS
-struct scom_debug_entry {
- struct device_node *dn;
- struct debugfs_blob_wrapper path;
- char name[16];
-};
-
-static ssize_t scom_debug_read(struct file *filp, char __user *ubuf,
- size_t count, loff_t *ppos)
-{
- struct scom_debug_entry *ent = filp->private_data;
- u64 __user *ubuf64 = (u64 __user *)ubuf;
- loff_t off = *ppos;
- ssize_t done = 0;
- u64 reg, reg_cnt, val;
- scom_map_t map;
- int rc;
-
- if (off < 0 || (off & 7) || (count & 7))
- return -EINVAL;
- reg = off >> 3;
- reg_cnt = count >> 3;
-
- map = scom_map(ent->dn, reg, reg_cnt);
- if (!scom_map_ok(map))
- return -ENXIO;
-
- for (reg = 0; reg < reg_cnt; reg++) {
- rc = scom_read(map, reg, &val);
- if (!rc)
- rc = put_user(val, ubuf64);
- if (rc) {
- if (!done)
- done = rc;
- break;
- }
- ubuf64++;
- *ppos += 8;
- done += 8;
- }
- scom_unmap(map);
- return done;
-}
-
-static ssize_t scom_debug_write(struct file* filp, const char __user *ubuf,
- size_t count, loff_t *ppos)
-{
- struct scom_debug_entry *ent = filp->private_data;
- u64 __user *ubuf64 = (u64 __user *)ubuf;
- loff_t off = *ppos;
- ssize_t done = 0;
- u64 reg, reg_cnt, val;
- scom_map_t map;
- int rc;
-
- if (off < 0 || (off & 7) || (count & 7))
- return -EINVAL;
- reg = off >> 3;
- reg_cnt = count >> 3;
-
- map = scom_map(ent->dn, reg, reg_cnt);
- if (!scom_map_ok(map))
- return -ENXIO;
-
- for (reg = 0; reg < reg_cnt; reg++) {
- rc = get_user(val, ubuf64);
- if (!rc)
- rc = scom_write(map, reg, val);
- if (rc) {
- if (!done)
- done = rc;
- break;
- }
- ubuf64++;
- done += 8;
- }
- scom_unmap(map);
- return done;
-}
-
-static const struct file_operations scom_debug_fops = {
- .read = scom_debug_read,
- .write = scom_debug_write,
- .open = simple_open,
- .llseek = default_llseek,
-};
-
-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);
- snprintf(ent->name, 16, "%08x", i);
- ent->path.data = (void*)kasprintf(GFP_KERNEL, "%pOF", dn);
- ent->path.size = strlen((char *)ent->path.data);
-
- dir = debugfs_create_dir(ent->name, root);
- if (!dir) {
- of_node_put(dn);
- kfree(ent->path.data);
- kfree(ent);
- return -1;
- }
-
- debugfs_create_blob("devspec", 0400, dir, &ent->path);
- debugfs_create_file("access", 0600, dir, ent, &scom_debug_fops);
-
- 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") {
- int id = of_get_ibm_chip_id(dn);
- if (id == -1)
- id = i;
- rc |= scom_debug_init_one(root, dn, id);
- i++;
- }
-
- return rc;
-}
-device_initcall(scom_debug_init);
-#endif /* CONFIG_SCOM_DEBUGFS */