/* * 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 sparc32 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 #include #include #include #include #include #include #include #include "prom.h" 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; } /* 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. */ static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf) { struct linux_prom_registers *regs; struct property *rprop; rprop = of_find_property(dp, "reg", NULL); if (!rprop) return; regs = rprop->value; sprintf(tmp_buf, "%s@%x,%x", dp->name, regs->which_io, regs->phys_addr); } /* "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@addrhi,addrlo" */ static void __init ebus_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); } 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, "ebus")) return ebus_path_component(dp, tmp_buf); /* "isa" is handled with platform naming */ } /* Use platform naming convention. */ return sparc32_path_component(dp, tmp_buf); } 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; } extern void restore_current(void); void __init of_console_init(void) { char *msg = "OF stdout device is: %s\n"; struct device_node *dp; unsigned long flags; const char *type; phandle node; int skip, tmp, fd; of_console_path = prom_early_alloc(256); switch (prom_vers) { case PROM_V0: skip = 0; switch (*romvec->pv_stdout) { case PROMDEV_SCREEN: type = "display"; break; case PROMDEV_TTYB: skip = 1; /* FALLTHRU */ case PROMDEV_TTYA: type = "serial"; break; default: prom_printf("Invalid PROM_V0 stdout value %u\n", *romvec->pv_stdout); prom_halt(); } tmp = skip; for_each_node_by_type(dp, type) { if (!tmp--) break; } if (!dp) { prom_printf("Cannot find PROM_V0 console node.\n"); prom_halt(); } of_console_device = dp; strcpy(of_console_path, dp->full_name); if (!strcmp(type, "serial")) { strcat(of_console_path, (skip ? ":b" : ":a")); } break; default: case PROM_V2: case PROM_V3: fd = *romvec->pv_v2bootargs.fd_stdout; spin_lock_irqsave(&prom_lock, flags); node = (*romvec->pv_v2devops.v2_inst2pkg)(fd); restore_current(); spin_unlock_irqrestore(&prom_lock, flags); if (!node) { prom_printf("Cannot resolve stdout node from " "instance %08x.\n", fd); prom_halt(); } dp = of_find_node_by_phandle(node); type = of_get_property(dp, "device_type", NULL); if (!type) { prom_printf("Console stdout lacks " "device_type property.\n"); prom_halt(); } if (strcmp(type, "display") && strcmp(type, "serial")) { prom_printf("Console device_type is neither display " "nor serial.\n"); prom_halt(); } of_console_device = dp; if (prom_vers == PROM_V2) { strcpy(of_console_path, dp->full_name); switch (*romvec->pv_stdout) { case PROMDEV_TTYA: strcat(of_console_path, ":a"); break; case PROMDEV_TTYB: strcat(of_console_path, ":b"); break; } } else { const char *path; dp = of_find_node_by_path("/"); path = of_get_property(dp, "stdout-path", NULL); if (!path) { prom_printf("No stdout-path in root node.\n"); prom_halt(); } strcpy(of_console_path, path); } break; } of_console_options = strrchr(of_console_path, ':'); if (of_console_options) { of_console_options++; if (*of_console_options == '\0') of_console_options = NULL; } prom_printf(msg, of_console_path); printk(msg, of_console_path); } void __init of_fill_in_cpu_data(void) { }