634 lines
15 KiB
C
634 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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 sparc64 by David S. Miller davem@davemloft.net
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*/
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#include <linux/memblock.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/cpu.h>
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#include <linux/mm.h>
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#include <linux/of.h>
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#include <asm/prom.h>
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#include <asm/oplib.h>
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#include <asm/irq.h>
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#include <asm/asi.h>
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#include <asm/upa.h>
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#include <asm/smp.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 = memblock_alloc(size, SMP_CACHE_BYTES);
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if (!ret) {
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prom_printf("prom_early_alloc(%lu) failed\n", size);
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prom_halt();
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}
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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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* As an example, the boot device on my workstation has a full path:
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*
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* /pci@1e,600000/ide@d/disk@0,0:c
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*/
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static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf)
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{
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const char *name = of_get_property(dp, "name", NULL);
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struct linux_prom64_registers *regs;
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struct property *rprop;
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u32 high_bits, low_bits, type;
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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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if (!of_node_is_root(dp->parent)) {
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sprintf(tmp_buf, "%s@%x,%x",
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name,
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(unsigned int) (regs->phys_addr >> 32UL),
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(unsigned int) (regs->phys_addr & 0xffffffffUL));
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return;
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}
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type = regs->phys_addr >> 60UL;
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high_bits = (regs->phys_addr >> 32UL) & 0x0fffffffUL;
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low_bits = (regs->phys_addr & 0xffffffffUL);
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if (type == 0 || type == 8) {
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const char *prefix = (type == 0) ? "m" : "i";
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if (low_bits)
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sprintf(tmp_buf, "%s@%s%x,%x",
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name, prefix,
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high_bits, low_bits);
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else
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sprintf(tmp_buf, "%s@%s%x",
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name,
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prefix,
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high_bits);
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} else if (type == 12) {
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sprintf(tmp_buf, "%s@%x",
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name, high_bits);
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}
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}
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static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
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{
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const char *name = of_get_property(dp, "name", NULL);
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struct linux_prom64_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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if (!of_node_is_root(dp->parent)) {
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sprintf(tmp_buf, "%s@%x,%x",
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name,
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(unsigned int) (regs->phys_addr >> 32UL),
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(unsigned int) (regs->phys_addr & 0xffffffffUL));
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return;
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}
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prop = of_find_property(dp, "upa-portid", NULL);
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if (!prop)
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prop = of_find_property(dp, "portid", NULL);
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if (prop) {
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unsigned long mask = 0xffffffffUL;
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if (tlb_type >= cheetah)
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mask = 0x7fffff;
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sprintf(tmp_buf, "%s@%x,%x",
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name,
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*(u32 *)prop->value,
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(unsigned int) (regs->phys_addr & mask));
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}
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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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const char *name = of_get_property(dp, "name", NULL);
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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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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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const char *name = of_get_property(dp, "name", NULL);
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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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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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name,
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devfn >> 3);
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}
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}
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/* "name@UPA_PORTID,offset" */
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static void __init upa_path_component(struct device_node *dp, char *tmp_buf)
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{
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const char *name = of_get_property(dp, "name", NULL);
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struct linux_prom64_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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prop = of_find_property(dp, "upa-portid", NULL);
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if (!prop)
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return;
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sprintf(tmp_buf, "%s@%x,%x",
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name,
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*(u32 *) prop->value,
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(unsigned int) (regs->phys_addr & 0xffffffffUL));
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}
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/* "name@reg" */
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static void __init vdev_path_component(struct device_node *dp, char *tmp_buf)
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{
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const char *name = of_get_property(dp, "name", NULL);
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struct property *prop;
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u32 *regs;
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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", name, *regs);
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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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const char *name = of_get_property(dp, "name", NULL);
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struct linux_prom64_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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name,
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(unsigned int) (regs->phys_addr >> 32UL),
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(unsigned int) (regs->phys_addr & 0xffffffffUL));
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}
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/* "name@bus,addr" */
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static void __init i2c_path_component(struct device_node *dp, char *tmp_buf)
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{
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const char *name = of_get_property(dp, "name", NULL);
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struct property *prop;
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u32 *regs;
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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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/* This actually isn't right... should look at the #address-cells
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* property of the i2c bus node etc. etc.
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*/
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sprintf(tmp_buf, "%s@%x,%x",
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name, regs[0], regs[1]);
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}
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/* "name@reg0[,reg1]" */
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static void __init usb_path_component(struct device_node *dp, char *tmp_buf)
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{
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const char *name = of_get_property(dp, "name", NULL);
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struct property *prop;
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u32 *regs;
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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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if (prop->length == sizeof(u32) || regs[1] == 1) {
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sprintf(tmp_buf, "%s@%x",
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name, regs[0]);
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} else {
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sprintf(tmp_buf, "%s@%x,%x",
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name, regs[0], regs[1]);
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}
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}
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/* "name@reg0reg1[,reg2reg3]" */
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static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf)
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{
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const char *name = of_get_property(dp, "name", NULL);
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struct property *prop;
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u32 *regs;
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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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if (regs[2] || regs[3]) {
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sprintf(tmp_buf, "%s@%08x%08x,%04x%08x",
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name, regs[0], regs[1], regs[2], regs[3]);
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} else {
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sprintf(tmp_buf, "%s@%08x%08x",
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name, regs[0], regs[1]);
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}
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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 (of_node_is_type(parent, "pci") ||
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of_node_is_type(parent, "pciex")) {
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pci_path_component(dp, tmp_buf);
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return;
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}
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if (of_node_is_type(parent, "sbus")) {
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sbus_path_component(dp, tmp_buf);
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return;
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}
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if (of_node_is_type(parent, "upa")) {
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upa_path_component(dp, tmp_buf);
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return;
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}
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if (of_node_is_type(parent, "ebus")) {
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ebus_path_component(dp, tmp_buf);
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return;
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}
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if (of_node_name_eq(parent, "usb") ||
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of_node_name_eq(parent, "hub")) {
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usb_path_component(dp, tmp_buf);
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return;
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}
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if (of_node_is_type(parent, "i2c")) {
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i2c_path_component(dp, tmp_buf);
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return;
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}
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if (of_node_is_type(parent, "firewire")) {
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ieee1394_path_component(dp, tmp_buf);
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return;
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}
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if (of_node_is_type(parent, "virtual-devices")) {
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vdev_path_component(dp, tmp_buf);
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return;
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}
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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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if (tlb_type == hypervisor) {
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sun4v_path_component(dp, tmp_buf);
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return;
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} else {
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sun4u_path_component(dp, tmp_buf);
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}
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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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const char *name = of_get_property(dp, "name", NULL);
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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, 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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static const char *get_mid_prop(void)
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{
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return (tlb_type == spitfire ? "upa-portid" : "portid");
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}
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bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
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int cpu, unsigned int *thread)
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{
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const char *mid_prop = get_mid_prop();
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int this_cpu_id;
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/* On hypervisor based platforms we interrogate the 'reg'
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* property. On everything else we look for a 'upa-portid',
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* 'portid', or 'cpuid' property.
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*/
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if (tlb_type == hypervisor) {
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struct property *prop = of_find_property(cpun, "reg", NULL);
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u32 *regs;
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if (!prop) {
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pr_warn("CPU node missing reg property\n");
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return false;
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}
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regs = prop->value;
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this_cpu_id = regs[0] & 0x0fffffff;
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} else {
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this_cpu_id = of_getintprop_default(cpun, mid_prop, -1);
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if (this_cpu_id < 0) {
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mid_prop = "cpuid";
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this_cpu_id = of_getintprop_default(cpun, mid_prop, -1);
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}
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if (this_cpu_id < 0) {
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pr_warn("CPU node missing cpu ID property\n");
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return false;
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}
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}
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if (this_cpu_id == cpu) {
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if (thread) {
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int proc_id = cpu_data(cpu).proc_id;
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/* On sparc64, the cpu thread information is obtained
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* either from OBP or the machine description. We've
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* actually probed this information already long before
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* this interface gets called so instead of interrogating
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* both the OF node and the MDESC again, just use what
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* we discovered already.
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*/
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if (proc_id < 0)
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proc_id = 0;
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*thread = proc_id;
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}
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return true;
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}
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return false;
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}
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static void *of_iterate_over_cpus(void *(*func)(struct device_node *, int, int), int arg)
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{
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struct device_node *dp;
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const char *mid_prop;
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mid_prop = get_mid_prop();
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for_each_node_by_type(dp, "cpu") {
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int cpuid = of_getintprop_default(dp, mid_prop, -1);
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const char *this_mid_prop = mid_prop;
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void *ret;
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if (cpuid < 0) {
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this_mid_prop = "cpuid";
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cpuid = of_getintprop_default(dp, this_mid_prop, -1);
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}
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if (cpuid < 0) {
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prom_printf("OF: Serious problem, cpu lacks "
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"%s property", this_mid_prop);
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prom_halt();
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}
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#ifdef CONFIG_SMP
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if (cpuid >= NR_CPUS) {
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printk(KERN_WARNING "Ignoring CPU %d which is "
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">= NR_CPUS (%d)\n",
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cpuid, NR_CPUS);
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continue;
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}
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#endif
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ret = func(dp, cpuid, arg);
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if (ret)
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return ret;
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}
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return NULL;
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}
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static void *check_cpu_node(struct device_node *dp, int cpuid, int id)
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{
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if (id == cpuid)
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return dp;
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return NULL;
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}
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struct device_node *of_find_node_by_cpuid(int cpuid)
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{
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return of_iterate_over_cpus(check_cpu_node, cpuid);
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}
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static void *record_one_cpu(struct device_node *dp, int cpuid, int arg)
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{
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ncpus_probed++;
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#ifdef CONFIG_SMP
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set_cpu_present(cpuid, true);
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set_cpu_possible(cpuid, true);
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#endif
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return NULL;
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}
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void __init of_populate_present_mask(void)
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{
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if (tlb_type == hypervisor)
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return;
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ncpus_probed = 0;
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of_iterate_over_cpus(record_one_cpu, 0);
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}
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static void *fill_in_one_cpu(struct device_node *dp, int cpuid, int arg)
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{
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struct device_node *portid_parent = NULL;
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int portid = -1;
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if (of_find_property(dp, "cpuid", NULL)) {
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int limit = 2;
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portid_parent = dp;
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while (limit--) {
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portid_parent = portid_parent->parent;
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if (!portid_parent)
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break;
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portid = of_getintprop_default(portid_parent,
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"portid", -1);
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if (portid >= 0)
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break;
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}
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}
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#ifndef CONFIG_SMP
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/* On uniprocessor we only want the values for the
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* real physical cpu the kernel booted onto, however
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* cpu_data() only has one entry at index 0.
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*/
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if (cpuid != real_hard_smp_processor_id())
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return NULL;
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cpuid = 0;
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#endif
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cpu_data(cpuid).clock_tick =
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of_getintprop_default(dp, "clock-frequency", 0);
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if (portid_parent) {
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cpu_data(cpuid).dcache_size =
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of_getintprop_default(dp, "l1-dcache-size",
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16 * 1024);
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cpu_data(cpuid).dcache_line_size =
|
|
of_getintprop_default(dp, "l1-dcache-line-size",
|
|
32);
|
|
cpu_data(cpuid).icache_size =
|
|
of_getintprop_default(dp, "l1-icache-size",
|
|
8 * 1024);
|
|
cpu_data(cpuid).icache_line_size =
|
|
of_getintprop_default(dp, "l1-icache-line-size",
|
|
32);
|
|
cpu_data(cpuid).ecache_size =
|
|
of_getintprop_default(dp, "l2-cache-size", 0);
|
|
cpu_data(cpuid).ecache_line_size =
|
|
of_getintprop_default(dp, "l2-cache-line-size", 0);
|
|
if (!cpu_data(cpuid).ecache_size ||
|
|
!cpu_data(cpuid).ecache_line_size) {
|
|
cpu_data(cpuid).ecache_size =
|
|
of_getintprop_default(portid_parent,
|
|
"l2-cache-size",
|
|
(4 * 1024 * 1024));
|
|
cpu_data(cpuid).ecache_line_size =
|
|
of_getintprop_default(portid_parent,
|
|
"l2-cache-line-size", 64);
|
|
}
|
|
|
|
cpu_data(cpuid).core_id = portid + 1;
|
|
cpu_data(cpuid).proc_id = portid;
|
|
} else {
|
|
cpu_data(cpuid).dcache_size =
|
|
of_getintprop_default(dp, "dcache-size", 16 * 1024);
|
|
cpu_data(cpuid).dcache_line_size =
|
|
of_getintprop_default(dp, "dcache-line-size", 32);
|
|
|
|
cpu_data(cpuid).icache_size =
|
|
of_getintprop_default(dp, "icache-size", 16 * 1024);
|
|
cpu_data(cpuid).icache_line_size =
|
|
of_getintprop_default(dp, "icache-line-size", 32);
|
|
|
|
cpu_data(cpuid).ecache_size =
|
|
of_getintprop_default(dp, "ecache-size",
|
|
(4 * 1024 * 1024));
|
|
cpu_data(cpuid).ecache_line_size =
|
|
of_getintprop_default(dp, "ecache-line-size", 64);
|
|
|
|
cpu_data(cpuid).core_id = 0;
|
|
cpu_data(cpuid).proc_id = -1;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void __init of_fill_in_cpu_data(void)
|
|
{
|
|
if (tlb_type == hypervisor)
|
|
return;
|
|
|
|
of_iterate_over_cpus(fill_in_one_cpu, 0);
|
|
|
|
smp_fill_in_sib_core_maps();
|
|
}
|
|
|
|
void __init of_console_init(void)
|
|
{
|
|
char *msg = "OF stdout device is: %s\n";
|
|
struct device_node *dp;
|
|
phandle node;
|
|
|
|
of_console_path = prom_early_alloc(256);
|
|
if (prom_ihandle2path(prom_stdout, of_console_path, 256) < 0) {
|
|
prom_printf("Cannot obtain path of stdout.\n");
|
|
prom_halt();
|
|
}
|
|
of_console_options = strrchr(of_console_path, ':');
|
|
if (of_console_options) {
|
|
of_console_options++;
|
|
if (*of_console_options == '\0')
|
|
of_console_options = NULL;
|
|
}
|
|
|
|
node = prom_inst2pkg(prom_stdout);
|
|
if (!node) {
|
|
prom_printf("Cannot resolve stdout node from "
|
|
"instance %08x.\n", prom_stdout);
|
|
prom_halt();
|
|
}
|
|
|
|
dp = of_find_node_by_phandle(node);
|
|
|
|
if (!of_node_is_type(dp, "display") && !of_node_is_type(dp, "serial")) {
|
|
prom_printf("Console device_type is neither display "
|
|
"nor serial.\n");
|
|
prom_halt();
|
|
}
|
|
|
|
of_console_device = dp;
|
|
|
|
printk(msg, of_console_path);
|
|
}
|