diff options
Diffstat (limited to 'arch/powerpc/sysdev/scom.c')
| -rw-r--r-- | arch/powerpc/sysdev/scom.c | 223 |
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 */ |