diff options
Diffstat (limited to 'arch/sparc64/kernel/prom.c')
| -rw-r--r-- | arch/sparc64/kernel/prom.c | 721 |
1 files changed, 721 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/prom.c b/arch/sparc64/kernel/prom.c new file mode 100644 index 00000000000..8e87e7ea032 --- /dev/null +++ b/arch/sparc64/kernel/prom.c @@ -0,0 +1,721 @@ +/* + * 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); +} |