| /* |
| * Procedures for creating, accessing and interpreting the device tree. |
| * |
| * Paul Mackerras August 1996. |
| * Copyright (C) 1996-2005 Paul Mackerras. |
| * |
| * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. |
| * {engebret|bergner}@us.ibm.com |
| * |
| * Adapted for sparc64 by David S. Miller davem@davemloft.net |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/types.h> |
| #include <linux/string.h> |
| #include <linux/mm.h> |
| #include <linux/bootmem.h> |
| #include <linux/module.h> |
| |
| #include <asm/prom.h> |
| #include <asm/oplib.h> |
| |
| static struct device_node *allnodes; |
| |
| /* use when traversing tree through the allnext, child, sibling, |
| * or parent members of struct device_node. |
| */ |
| static DEFINE_RWLOCK(devtree_lock); |
| |
| int of_device_is_compatible(struct device_node *device, const char *compat) |
| { |
| const char* cp; |
| int cplen, l; |
| |
| cp = (char *) of_get_property(device, "compatible", &cplen); |
| if (cp == NULL) |
| return 0; |
| while (cplen > 0) { |
| if (strncmp(cp, compat, strlen(compat)) == 0) |
| return 1; |
| l = strlen(cp) + 1; |
| cp += l; |
| cplen -= l; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(of_device_is_compatible); |
| |
| struct device_node *of_get_parent(const struct device_node *node) |
| { |
| struct device_node *np; |
| |
| if (!node) |
| return NULL; |
| |
| np = node->parent; |
| |
| return np; |
| } |
| EXPORT_SYMBOL(of_get_parent); |
| |
| struct device_node *of_get_next_child(const struct device_node *node, |
| struct device_node *prev) |
| { |
| struct device_node *next; |
| |
| next = prev ? prev->sibling : node->child; |
| for (; next != 0; next = next->sibling) { |
| break; |
| } |
| |
| return next; |
| } |
| EXPORT_SYMBOL(of_get_next_child); |
| |
| struct device_node *of_find_node_by_path(const char *path) |
| { |
| struct device_node *np = allnodes; |
| |
| for (; np != 0; np = np->allnext) { |
| if (np->full_name != 0 && strcmp(np->full_name, path) == 0) |
| break; |
| } |
| |
| return np; |
| } |
| EXPORT_SYMBOL(of_find_node_by_path); |
| |
| struct device_node *of_find_node_by_phandle(phandle handle) |
| { |
| struct device_node *np; |
| |
| for (np = allnodes; np != 0; np = np->allnext) |
| if (np->node == handle) |
| break; |
| |
| return np; |
| } |
| EXPORT_SYMBOL(of_find_node_by_phandle); |
| |
| struct device_node *of_find_node_by_name(struct device_node *from, |
| const char *name) |
| { |
| struct device_node *np; |
| |
| np = from ? from->allnext : allnodes; |
| for (; np != NULL; np = np->allnext) |
| if (np->name != NULL && strcmp(np->name, name) == 0) |
| break; |
| |
| return np; |
| } |
| EXPORT_SYMBOL(of_find_node_by_name); |
| |
| struct device_node *of_find_node_by_type(struct device_node *from, |
| const char *type) |
| { |
| struct device_node *np; |
| |
| np = from ? from->allnext : allnodes; |
| for (; np != 0; np = np->allnext) |
| if (np->type != 0 && strcmp(np->type, type) == 0) |
| break; |
| |
| return np; |
| } |
| EXPORT_SYMBOL(of_find_node_by_type); |
| |
| struct device_node *of_find_compatible_node(struct device_node *from, |
| const char *type, const char *compatible) |
| { |
| struct device_node *np; |
| |
| np = from ? from->allnext : allnodes; |
| for (; np != 0; np = np->allnext) { |
| if (type != NULL |
| && !(np->type != 0 && strcmp(np->type, type) == 0)) |
| continue; |
| if (of_device_is_compatible(np, compatible)) |
| break; |
| } |
| |
| return np; |
| } |
| EXPORT_SYMBOL(of_find_compatible_node); |
| |
| struct property *of_find_property(struct device_node *np, const char *name, |
| int *lenp) |
| { |
| struct property *pp; |
| |
| for (pp = np->properties; pp != 0; pp = pp->next) { |
| if (strcmp(pp->name, name) == 0) { |
| if (lenp != 0) |
| *lenp = pp->length; |
| break; |
| } |
| } |
| return pp; |
| } |
| EXPORT_SYMBOL(of_find_property); |
| |
| /* |
| * Find a property with a given name for a given node |
| * and return the value. |
| */ |
| void *of_get_property(struct device_node *np, const char *name, int *lenp) |
| { |
| struct property *pp = of_find_property(np,name,lenp); |
| return pp ? pp->value : NULL; |
| } |
| EXPORT_SYMBOL(of_get_property); |
| |
| int of_getintprop_default(struct device_node *np, const char *name, int def) |
| { |
| struct property *prop; |
| int len; |
| |
| prop = of_find_property(np, name, &len); |
| if (!prop || len != 4) |
| return def; |
| |
| return *(int *) prop->value; |
| } |
| EXPORT_SYMBOL(of_getintprop_default); |
| |
| int of_set_property(struct device_node *dp, const char *name, void *val, int len) |
| { |
| struct property **prevp; |
| void *new_val; |
| int err; |
| |
| new_val = kmalloc(len, GFP_KERNEL); |
| if (!new_val) |
| return -ENOMEM; |
| |
| memcpy(new_val, val, len); |
| |
| err = -ENODEV; |
| |
| write_lock(&devtree_lock); |
| prevp = &dp->properties; |
| while (*prevp) { |
| struct property *prop = *prevp; |
| |
| if (!strcmp(prop->name, name)) { |
| void *old_val = prop->value; |
| int ret; |
| |
| ret = prom_setprop(dp->node, name, val, len); |
| err = -EINVAL; |
| if (ret >= 0) { |
| prop->value = new_val; |
| prop->length = len; |
| |
| if (OF_IS_DYNAMIC(prop)) |
| kfree(old_val); |
| |
| OF_MARK_DYNAMIC(prop); |
| |
| err = 0; |
| } |
| break; |
| } |
| prevp = &(*prevp)->next; |
| } |
| write_unlock(&devtree_lock); |
| |
| /* XXX Upate procfs if necessary... */ |
| |
| return err; |
| } |
| EXPORT_SYMBOL(of_set_property); |
| |
| static unsigned int prom_early_allocated; |
| |
| static void * __init prom_early_alloc(unsigned long size) |
| { |
| void *ret; |
| |
| ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL); |
| if (ret != NULL) |
| memset(ret, 0, size); |
| |
| prom_early_allocated += size; |
| |
| return ret; |
| } |
| |
| static int is_root_node(const struct device_node *dp) |
| { |
| if (!dp) |
| return 0; |
| |
| return (dp->parent == NULL); |
| } |
| |
| /* The following routines deal with the black magic of fully naming a |
| * node. |
| * |
| * Certain well known named nodes are just the simple name string. |
| * |
| * Actual devices have an address specifier appended to the base name |
| * string, like this "foo@addr". The "addr" can be in any number of |
| * formats, and the platform plus the type of the node determine the |
| * format and how it is constructed. |
| * |
| * For children of the ROOT node, the naming convention is fixed and |
| * determined by whether this is a sun4u or sun4v system. |
| * |
| * For children of other nodes, it is bus type specific. So |
| * we walk up the tree until we discover a "device_type" property |
| * we recognize and we go from there. |
| * |
| * As an example, the boot device on my workstation has a full path: |
| * |
| * /pci@1e,600000/ide@d/disk@0,0:c |
| */ |
| static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf) |
| { |
| struct linux_prom64_registers *regs; |
| struct property *rprop; |
| u32 high_bits, low_bits, type; |
| |
| rprop = of_find_property(dp, "reg", NULL); |
| if (!rprop) |
| return; |
| |
| regs = rprop->value; |
| if (!is_root_node(dp->parent)) { |
| sprintf(tmp_buf, "%s@%x,%x", |
| dp->name, |
| (unsigned int) (regs->phys_addr >> 32UL), |
| (unsigned int) (regs->phys_addr & 0xffffffffUL)); |
| return; |
| } |
| |
| type = regs->phys_addr >> 60UL; |
| high_bits = (regs->phys_addr >> 32UL) & 0x0fffffffUL; |
| low_bits = (regs->phys_addr & 0xffffffffUL); |
| |
| if (type == 0 || type == 8) { |
| const char *prefix = (type == 0) ? "m" : "i"; |
| |
| if (low_bits) |
| sprintf(tmp_buf, "%s@%s%x,%x", |
| dp->name, prefix, |
| high_bits, low_bits); |
| else |
| sprintf(tmp_buf, "%s@%s%x", |
| dp->name, |
| prefix, |
| high_bits); |
| } else if (type == 12) { |
| sprintf(tmp_buf, "%s@%x", |
| dp->name, high_bits); |
| } |
| } |
| |
| static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf) |
| { |
| struct linux_prom64_registers *regs; |
| struct property *prop; |
| |
| prop = of_find_property(dp, "reg", NULL); |
| if (!prop) |
| return; |
| |
| regs = prop->value; |
| if (!is_root_node(dp->parent)) { |
| sprintf(tmp_buf, "%s@%x,%x", |
| dp->name, |
| (unsigned int) (regs->phys_addr >> 32UL), |
| (unsigned int) (regs->phys_addr & 0xffffffffUL)); |
| return; |
| } |
| |
| prop = of_find_property(dp, "upa-portid", NULL); |
| if (!prop) |
| prop = of_find_property(dp, "portid", NULL); |
| if (prop) { |
| unsigned long mask = 0xffffffffUL; |
| |
| if (tlb_type >= cheetah) |
| mask = 0x7fffff; |
| |
| sprintf(tmp_buf, "%s@%x,%x", |
| dp->name, |
| *(u32 *)prop->value, |
| (unsigned int) (regs->phys_addr & mask)); |
| } |
| } |
| |
| /* "name@slot,offset" */ |
| static void __init sbus_path_component(struct device_node *dp, char *tmp_buf) |
| { |
| struct linux_prom_registers *regs; |
| struct property *prop; |
| |
| prop = of_find_property(dp, "reg", NULL); |
| if (!prop) |
| return; |
| |
| regs = prop->value; |
| sprintf(tmp_buf, "%s@%x,%x", |
| dp->name, |
| regs->which_io, |
| regs->phys_addr); |
| } |
| |
| /* "name@devnum[,func]" */ |
| static void __init pci_path_component(struct device_node *dp, char *tmp_buf) |
| { |
| struct linux_prom_pci_registers *regs; |
| struct property *prop; |
| unsigned int devfn; |
| |
| prop = of_find_property(dp, "reg", NULL); |
| if (!prop) |
| return; |
| |
| regs = prop->value; |
| devfn = (regs->phys_hi >> 8) & 0xff; |
| if (devfn & 0x07) { |
| sprintf(tmp_buf, "%s@%x,%x", |
| dp->name, |
| devfn >> 3, |
| devfn & 0x07); |
| } else { |
| sprintf(tmp_buf, "%s@%x", |
| dp->name, |
| devfn >> 3); |
| } |
| } |
| |
| /* "name@UPA_PORTID,offset" */ |
| static void __init upa_path_component(struct device_node *dp, char *tmp_buf) |
| { |
| struct linux_prom64_registers *regs; |
| struct property *prop; |
| |
| prop = of_find_property(dp, "reg", NULL); |
| if (!prop) |
| return; |
| |
| regs = prop->value; |
| |
| prop = of_find_property(dp, "upa-portid", NULL); |
| if (!prop) |
| return; |
| |
| sprintf(tmp_buf, "%s@%x,%x", |
| dp->name, |
| *(u32 *) prop->value, |
| (unsigned int) (regs->phys_addr & 0xffffffffUL)); |
| } |
| |
| /* "name@reg" */ |
| static void __init vdev_path_component(struct device_node *dp, char *tmp_buf) |
| { |
| struct property *prop; |
| u32 *regs; |
| |
| prop = of_find_property(dp, "reg", NULL); |
| if (!prop) |
| return; |
| |
| regs = prop->value; |
| |
| sprintf(tmp_buf, "%s@%x", dp->name, *regs); |
| } |
| |
| /* "name@addrhi,addrlo" */ |
| static void __init ebus_path_component(struct device_node *dp, char *tmp_buf) |
| { |
| struct linux_prom64_registers *regs; |
| struct property *prop; |
| |
| prop = of_find_property(dp, "reg", NULL); |
| if (!prop) |
| return; |
| |
| regs = prop->value; |
| |
| sprintf(tmp_buf, "%s@%x,%x", |
| dp->name, |
| (unsigned int) (regs->phys_addr >> 32UL), |
| (unsigned int) (regs->phys_addr & 0xffffffffUL)); |
| } |
| |
| /* "name@bus,addr" */ |
| static void __init i2c_path_component(struct device_node *dp, char *tmp_buf) |
| { |
| struct property *prop; |
| u32 *regs; |
| |
| prop = of_find_property(dp, "reg", NULL); |
| if (!prop) |
| return; |
| |
| regs = prop->value; |
| |
| /* This actually isn't right... should look at the #address-cells |
| * property of the i2c bus node etc. etc. |
| */ |
| sprintf(tmp_buf, "%s@%x,%x", |
| dp->name, regs[0], regs[1]); |
| } |
| |
| /* "name@reg0[,reg1]" */ |
| static void __init usb_path_component(struct device_node *dp, char *tmp_buf) |
| { |
| struct property *prop; |
| u32 *regs; |
| |
| prop = of_find_property(dp, "reg", NULL); |
| if (!prop) |
| return; |
| |
| regs = prop->value; |
| |
| if (prop->length == sizeof(u32) || regs[1] == 1) { |
| sprintf(tmp_buf, "%s@%x", |
| dp->name, regs[0]); |
| } else { |
| sprintf(tmp_buf, "%s@%x,%x", |
| dp->name, regs[0], regs[1]); |
| } |
| } |
| |
| /* "name@reg0reg1[,reg2reg3]" */ |
| static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf) |
| { |
| struct property *prop; |
| u32 *regs; |
| |
| prop = of_find_property(dp, "reg", NULL); |
| if (!prop) |
| return; |
| |
| regs = prop->value; |
| |
| if (regs[2] || regs[3]) { |
| sprintf(tmp_buf, "%s@%08x%08x,%04x%08x", |
| dp->name, regs[0], regs[1], regs[2], regs[3]); |
| } else { |
| sprintf(tmp_buf, "%s@%08x%08x", |
| dp->name, regs[0], regs[1]); |
| } |
| } |
| |
| static void __init __build_path_component(struct device_node *dp, char *tmp_buf) |
| { |
| struct device_node *parent = dp->parent; |
| |
| if (parent != NULL) { |
| if (!strcmp(parent->type, "pci") || |
| !strcmp(parent->type, "pciex")) |
| return pci_path_component(dp, tmp_buf); |
| if (!strcmp(parent->type, "sbus")) |
| return sbus_path_component(dp, tmp_buf); |
| if (!strcmp(parent->type, "upa")) |
| return upa_path_component(dp, tmp_buf); |
| if (!strcmp(parent->type, "ebus")) |
| return ebus_path_component(dp, tmp_buf); |
| if (!strcmp(parent->name, "usb") || |
| !strcmp(parent->name, "hub")) |
| return usb_path_component(dp, tmp_buf); |
| if (!strcmp(parent->type, "i2c")) |
| return i2c_path_component(dp, tmp_buf); |
| if (!strcmp(parent->type, "firewire")) |
| return ieee1394_path_component(dp, tmp_buf); |
| if (!strcmp(parent->type, "virtual-devices")) |
| return vdev_path_component(dp, tmp_buf); |
| |
| /* "isa" is handled with platform naming */ |
| } |
| |
| /* Use platform naming convention. */ |
| if (tlb_type == hypervisor) |
| return sun4v_path_component(dp, tmp_buf); |
| else |
| return sun4u_path_component(dp, tmp_buf); |
| } |
| |
| static char * __init build_path_component(struct device_node *dp) |
| { |
| char tmp_buf[64], *n; |
| |
| tmp_buf[0] = '\0'; |
| __build_path_component(dp, tmp_buf); |
| if (tmp_buf[0] == '\0') |
| strcpy(tmp_buf, dp->name); |
| |
| n = prom_early_alloc(strlen(tmp_buf) + 1); |
| strcpy(n, tmp_buf); |
| |
| return n; |
| } |
| |
| static char * __init build_full_name(struct device_node *dp) |
| { |
| int len, ourlen, plen; |
| char *n; |
| |
| plen = strlen(dp->parent->full_name); |
| ourlen = strlen(dp->path_component_name); |
| len = ourlen + plen + 2; |
| |
| n = prom_early_alloc(len); |
| strcpy(n, dp->parent->full_name); |
| if (!is_root_node(dp->parent)) { |
| strcpy(n + plen, "/"); |
| plen++; |
| } |
| strcpy(n + plen, dp->path_component_name); |
| |
| return n; |
| } |
| |
| static unsigned int unique_id; |
| |
| static struct property * __init build_one_prop(phandle node, char *prev, char *special_name, void *special_val, int special_len) |
| { |
| static struct property *tmp = NULL; |
| struct property *p; |
| |
| if (tmp) { |
| p = tmp; |
| memset(p, 0, sizeof(*p) + 32); |
| tmp = NULL; |
| } else { |
| p = prom_early_alloc(sizeof(struct property) + 32); |
| p->unique_id = unique_id++; |
| } |
| |
| p->name = (char *) (p + 1); |
| if (special_name) { |
| strcpy(p->name, special_name); |
| p->length = special_len; |
| p->value = prom_early_alloc(special_len); |
| memcpy(p->value, special_val, special_len); |
| } else { |
| if (prev == NULL) { |
| prom_firstprop(node, p->name); |
| } else { |
| prom_nextprop(node, prev, p->name); |
| } |
| if (strlen(p->name) == 0) { |
| tmp = p; |
| return NULL; |
| } |
| p->length = prom_getproplen(node, p->name); |
| if (p->length <= 0) { |
| p->length = 0; |
| } else { |
| p->value = prom_early_alloc(p->length + 1); |
| prom_getproperty(node, p->name, p->value, p->length); |
| ((unsigned char *)p->value)[p->length] = '\0'; |
| } |
| } |
| return p; |
| } |
| |
| static struct property * __init build_prop_list(phandle node) |
| { |
| struct property *head, *tail; |
| |
| head = tail = build_one_prop(node, NULL, |
| ".node", &node, sizeof(node)); |
| |
| tail->next = build_one_prop(node, NULL, NULL, NULL, 0); |
| tail = tail->next; |
| while(tail) { |
| tail->next = build_one_prop(node, tail->name, |
| NULL, NULL, 0); |
| tail = tail->next; |
| } |
| |
| return head; |
| } |
| |
| static char * __init get_one_property(phandle node, const char *name) |
| { |
| char *buf = "<NULL>"; |
| int len; |
| |
| len = prom_getproplen(node, name); |
| if (len > 0) { |
| buf = prom_early_alloc(len); |
| prom_getproperty(node, name, buf, len); |
| } |
| |
| return buf; |
| } |
| |
| static struct device_node * __init create_node(phandle node) |
| { |
| struct device_node *dp; |
| |
| if (!node) |
| return NULL; |
| |
| dp = prom_early_alloc(sizeof(*dp)); |
| dp->unique_id = unique_id++; |
| |
| kref_init(&dp->kref); |
| |
| dp->name = get_one_property(node, "name"); |
| dp->type = get_one_property(node, "device_type"); |
| dp->node = node; |
| |
| /* Build interrupts later... */ |
| |
| dp->properties = build_prop_list(node); |
| |
| return dp; |
| } |
| |
| static struct device_node * __init build_tree(struct device_node *parent, phandle node, struct device_node ***nextp) |
| { |
| struct device_node *dp; |
| |
| dp = create_node(node); |
| if (dp) { |
| *(*nextp) = dp; |
| *nextp = &dp->allnext; |
| |
| dp->parent = parent; |
| dp->path_component_name = build_path_component(dp); |
| dp->full_name = build_full_name(dp); |
| |
| dp->child = build_tree(dp, prom_getchild(node), nextp); |
| |
| dp->sibling = build_tree(parent, prom_getsibling(node), nextp); |
| } |
| |
| return dp; |
| } |
| |
| void __init prom_build_devicetree(void) |
| { |
| struct device_node **nextp; |
| |
| allnodes = create_node(prom_root_node); |
| allnodes->path_component_name = ""; |
| allnodes->full_name = "/"; |
| |
| nextp = &allnodes->allnext; |
| allnodes->child = build_tree(allnodes, |
| prom_getchild(allnodes->node), |
| &nextp); |
| printk("PROM: Built device tree with %u bytes of memory.\n", |
| prom_early_allocated); |
| } |