296 строки
6.5 KiB
C
296 строки
6.5 KiB
C
/*
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* Procedures for creating, accessing and interpreting the device tree.
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*
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* Paul Mackerras August 1996.
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* Copyright (C) 1996-2005 Paul Mackerras.
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*
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* Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
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* {engebret|bergner}@us.ibm.com
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*
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* Adapted for sparc32 by David S. Miller davem@davemloft.net
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/module.h>
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#include <asm/prom.h>
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#include <asm/oplib.h>
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#include "prom.h"
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void * __init prom_early_alloc(unsigned long size)
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{
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void *ret;
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ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
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if (ret != NULL)
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memset(ret, 0, size);
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prom_early_allocated += size;
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return ret;
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}
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/* The following routines deal with the black magic of fully naming a
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* node.
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*
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* Certain well known named nodes are just the simple name string.
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*
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* Actual devices have an address specifier appended to the base name
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* string, like this "foo@addr". The "addr" can be in any number of
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* formats, and the platform plus the type of the node determine the
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* format and how it is constructed.
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*
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* For children of the ROOT node, the naming convention is fixed and
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* determined by whether this is a sun4u or sun4v system.
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*
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* For children of other nodes, it is bus type specific. So
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* we walk up the tree until we discover a "device_type" property
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* we recognize and we go from there.
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*/
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static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf)
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{
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struct linux_prom_registers *regs;
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struct property *rprop;
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rprop = of_find_property(dp, "reg", NULL);
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if (!rprop)
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return;
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regs = rprop->value;
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sprintf(tmp_buf, "%s@%x,%x",
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dp->name,
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regs->which_io, regs->phys_addr);
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}
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/* "name@slot,offset" */
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static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
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{
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struct linux_prom_registers *regs;
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struct property *prop;
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prop = of_find_property(dp, "reg", NULL);
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if (!prop)
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return;
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regs = prop->value;
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sprintf(tmp_buf, "%s@%x,%x",
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dp->name,
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regs->which_io,
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regs->phys_addr);
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}
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/* "name@devnum[,func]" */
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static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
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{
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struct linux_prom_pci_registers *regs;
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struct property *prop;
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unsigned int devfn;
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prop = of_find_property(dp, "reg", NULL);
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if (!prop)
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return;
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regs = prop->value;
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devfn = (regs->phys_hi >> 8) & 0xff;
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if (devfn & 0x07) {
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sprintf(tmp_buf, "%s@%x,%x",
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dp->name,
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devfn >> 3,
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devfn & 0x07);
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} else {
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sprintf(tmp_buf, "%s@%x",
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dp->name,
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devfn >> 3);
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}
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}
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/* "name@addrhi,addrlo" */
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static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
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{
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struct linux_prom_registers *regs;
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struct property *prop;
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prop = of_find_property(dp, "reg", NULL);
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if (!prop)
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return;
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regs = prop->value;
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sprintf(tmp_buf, "%s@%x,%x",
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dp->name,
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regs->which_io, regs->phys_addr);
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}
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static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
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{
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struct device_node *parent = dp->parent;
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if (parent != NULL) {
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if (!strcmp(parent->type, "pci") ||
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!strcmp(parent->type, "pciex"))
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return pci_path_component(dp, tmp_buf);
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if (!strcmp(parent->type, "sbus"))
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return sbus_path_component(dp, tmp_buf);
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if (!strcmp(parent->type, "ebus"))
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return ebus_path_component(dp, tmp_buf);
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/* "isa" is handled with platform naming */
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}
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/* Use platform naming convention. */
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return sparc32_path_component(dp, tmp_buf);
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}
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char * __init build_path_component(struct device_node *dp)
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{
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char tmp_buf[64], *n;
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tmp_buf[0] = '\0';
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__build_path_component(dp, tmp_buf);
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if (tmp_buf[0] == '\0')
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strcpy(tmp_buf, dp->name);
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n = prom_early_alloc(strlen(tmp_buf) + 1);
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strcpy(n, tmp_buf);
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return n;
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}
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extern void restore_current(void);
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void __init of_console_init(void)
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{
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char *msg = "OF stdout device is: %s\n";
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struct device_node *dp;
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unsigned long flags;
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const char *type;
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phandle node;
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int skip, tmp, fd;
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of_console_path = prom_early_alloc(256);
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switch (prom_vers) {
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case PROM_V0:
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skip = 0;
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switch (*romvec->pv_stdout) {
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case PROMDEV_SCREEN:
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type = "display";
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break;
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case PROMDEV_TTYB:
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skip = 1;
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/* FALLTHRU */
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case PROMDEV_TTYA:
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type = "serial";
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break;
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default:
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prom_printf("Invalid PROM_V0 stdout value %u\n",
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*romvec->pv_stdout);
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prom_halt();
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}
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tmp = skip;
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for_each_node_by_type(dp, type) {
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if (!tmp--)
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break;
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}
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if (!dp) {
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prom_printf("Cannot find PROM_V0 console node.\n");
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prom_halt();
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}
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of_console_device = dp;
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strcpy(of_console_path, dp->full_name);
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if (!strcmp(type, "serial")) {
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strcat(of_console_path,
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(skip ? ":b" : ":a"));
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}
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break;
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default:
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case PROM_V2:
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case PROM_V3:
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fd = *romvec->pv_v2bootargs.fd_stdout;
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spin_lock_irqsave(&prom_lock, flags);
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node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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if (!node) {
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prom_printf("Cannot resolve stdout node from "
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"instance %08x.\n", fd);
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prom_halt();
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}
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dp = of_find_node_by_phandle(node);
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type = of_get_property(dp, "device_type", NULL);
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if (!type) {
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prom_printf("Console stdout lacks "
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"device_type property.\n");
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prom_halt();
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}
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if (strcmp(type, "display") && strcmp(type, "serial")) {
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prom_printf("Console device_type is neither display "
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"nor serial.\n");
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prom_halt();
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}
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of_console_device = dp;
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if (prom_vers == PROM_V2) {
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strcpy(of_console_path, dp->full_name);
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switch (*romvec->pv_stdout) {
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case PROMDEV_TTYA:
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strcat(of_console_path, ":a");
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break;
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case PROMDEV_TTYB:
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strcat(of_console_path, ":b");
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break;
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}
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} else {
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const char *path;
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dp = of_find_node_by_path("/");
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path = of_get_property(dp, "stdout-path", NULL);
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if (!path) {
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prom_printf("No stdout-path in root node.\n");
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prom_halt();
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}
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strcpy(of_console_path, path);
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}
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break;
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}
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of_console_options = strrchr(of_console_path, ':');
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if (of_console_options) {
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of_console_options++;
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if (*of_console_options == '\0')
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of_console_options = NULL;
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}
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prom_printf(msg, of_console_path);
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printk(msg, of_console_path);
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}
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void __init of_fill_in_cpu_data(void)
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{
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}
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void __init irq_trans_init(struct device_node *dp)
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{
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}
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