// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Procedures for creating , accessing and interpreting the device tree .
*
* Paul Mackerras August 1996 .
* Copyright ( C ) 1996 - 2005 Paul Mackerras .
*
* Adapted for 64 bit PowerPC by Dave Engebretsen and Peter Bergner .
* { engebret | bergner } @ us . ibm . com
*
* Adapted for sparc64 by David S . Miller davem @ davemloft . net
*/
#include <linux/memblock.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/cpu.h>
#include <linux/mm.h>
#include <linux/of.h>
#include <asm /prom.h>
#include <asm /oplib.h>
#include <asm /irq.h>
#include <asm /asi.h>
#include <asm /upa.h>
#include <asm /smp.h>
#include "prom.h"
void * __init prom_early_alloc(unsigned long size)
{
void *ret = memblock_alloc(size, SMP_CACHE_BYTES);
if (!ret) {
prom_printf("prom_early_alloc(%lu) failed\n" , size);
prom_halt();
}
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 .
*
* As an example , the boot device on my workstation has a full path :
*
* / pci @ 1 e , 600000 / ide @ d / disk @ 0 , 0 : c
*/
static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf)
{
const char *name = of_get_property(dp, "name" , NULL);
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 (!of_node_is_root(dp->parent)) {
sprintf(tmp_buf, "%s@%x,%x" ,
name,
(unsigned int ) (regs->phys_addr >> 32 UL),
(unsigned int ) (regs->phys_addr & 0 xffffffffUL));
return ;
}
type = regs->phys_addr >> 60 UL;
high_bits = (regs->phys_addr >> 32 UL) & 0 x0fffffffUL;
low_bits = (regs->phys_addr & 0 xffffffffUL);
if (type == 0 || type == 8 ) {
const char *prefix = (type == 0 ) ? "m" : "i" ;
if (low_bits)
sprintf(tmp_buf, "%s@%s%x,%x" ,
name, prefix,
high_bits, low_bits);
else
sprintf(tmp_buf, "%s@%s%x" ,
name,
prefix,
high_bits);
} else if (type == 12 ) {
sprintf(tmp_buf, "%s@%x" ,
name, high_bits);
}
}
static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
{
const char *name = of_get_property(dp, "name" , NULL);
struct linux_prom64_registers *regs;
struct property *prop;
prop = of_find_property(dp, "reg" , NULL);
if (!prop)
return ;
regs = prop->value;
if (!of_node_is_root(dp->parent)) {
sprintf(tmp_buf, "%s@%x,%x" ,
name,
(unsigned int ) (regs->phys_addr >> 32 UL),
(unsigned int ) (regs->phys_addr & 0 xffffffffUL));
return ;
}
prop = of_find_property(dp, "upa-portid" , NULL);
if (!prop)
prop = of_find_property(dp, "portid" , NULL);
if (prop) {
unsigned long mask = 0 xffffffffUL;
if (tlb_type >= cheetah)
mask = 0 x7fffff;
sprintf(tmp_buf, "%s@%x,%x" ,
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)
{
const char *name = of_get_property(dp, "name" , NULL);
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" ,
name,
regs->which_io,
regs->phys_addr);
}
/* "name@devnum[,func]" */
static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
{
const char *name = of_get_property(dp, "name" , NULL);
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 ) & 0 xff;
if (devfn & 0 x07) {
sprintf(tmp_buf, "%s@%x,%x" ,
name,
devfn >> 3 ,
devfn & 0 x07);
} else {
sprintf(tmp_buf, "%s@%x" ,
name,
devfn >> 3 );
}
}
/* "name@UPA_PORTID,offset" */
static void __init upa_path_component(struct device_node *dp, char *tmp_buf)
{
const char *name = of_get_property(dp, "name" , NULL);
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" ,
name,
*(u32 *) prop->value,
(unsigned int ) (regs->phys_addr & 0 xffffffffUL));
}
/* "name@reg" */
static void __init vdev_path_component(struct device_node *dp, char *tmp_buf)
{
const char *name = of_get_property(dp, "name" , NULL);
struct property *prop;
u32 *regs;
prop = of_find_property(dp, "reg" , NULL);
if (!prop)
return ;
regs = prop->value;
sprintf(tmp_buf, "%s@%x" , name, *regs);
}
/* "name@addrhi,addrlo" */
static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
{
const char *name = of_get_property(dp, "name" , NULL);
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" ,
name,
(unsigned int ) (regs->phys_addr >> 32 UL),
(unsigned int ) (regs->phys_addr & 0 xffffffffUL));
}
/* "name@bus,addr" */
static void __init i2c_path_component(struct device_node *dp, char *tmp_buf)
{
const char *name = of_get_property(dp, "name" , NULL);
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" ,
name, regs[0 ], regs[1 ]);
}
/* "name@reg0[,reg1]" */
static void __init usb_path_component(struct device_node *dp, char *tmp_buf)
{
const char *name = of_get_property(dp, "name" , NULL);
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" ,
name, regs[0 ]);
} else {
sprintf(tmp_buf, "%s@%x,%x" ,
name, regs[0 ], regs[1 ]);
}
}
/* "name@reg0reg1[,reg2reg3]" */
static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf)
{
const char *name = of_get_property(dp, "name" , NULL);
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" ,
name, regs[0 ], regs[1 ], regs[2 ], regs[3 ]);
} else {
sprintf(tmp_buf, "%s@%08x%08x" ,
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 (of_node_is_type(parent, "pci" ) ||
of_node_is_type(parent, "pciex" )) {
pci_path_component(dp, tmp_buf);
return ;
}
if (of_node_is_type(parent, "sbus" )) {
sbus_path_component(dp, tmp_buf);
return ;
}
if (of_node_is_type(parent, "upa" )) {
upa_path_component(dp, tmp_buf);
return ;
}
if (of_node_is_type(parent, "ebus" )) {
ebus_path_component(dp, tmp_buf);
return ;
}
if (of_node_name_eq(parent, "usb" ) ||
of_node_name_eq(parent, "hub" )) {
usb_path_component(dp, tmp_buf);
return ;
}
if (of_node_is_type(parent, "i2c" )) {
i2c_path_component(dp, tmp_buf);
return ;
}
if (of_node_is_type(parent, "firewire" )) {
ieee1394_path_component(dp, tmp_buf);
return ;
}
if (of_node_is_type(parent, "virtual-devices" )) {
vdev_path_component(dp, tmp_buf);
return ;
}
/* "isa" is handled with platform naming */
}
/* Use platform naming convention. */
if (tlb_type == hypervisor) {
sun4v_path_component(dp, tmp_buf);
return ;
} else {
sun4u_path_component(dp, tmp_buf);
}
}
char * __init build_path_component(struct device_node *dp)
{
const char *name = of_get_property(dp, "name" , NULL);
char tmp_buf[64 ], *n;
tmp_buf[0 ] = '\0' ;
__build_path_component(dp, tmp_buf);
if (tmp_buf[0 ] == '\0' )
strcpy(tmp_buf, name);
n = prom_early_alloc(strlen(tmp_buf) + 1 );
strcpy(n, tmp_buf);
return n;
}
static const char *get_mid_prop(void )
{
return (tlb_type == spitfire ? "upa-portid" : "portid" );
}
bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
int cpu, unsigned int *thread)
{
const char *mid_prop = get_mid_prop();
int this_cpu_id;
/* On hypervisor based platforms we interrogate the 'reg'
* property . On everything else we look for a ' upa - portid ' ,
* ' portid ' , or ' cpuid ' property .
*/
if (tlb_type == hypervisor) {
struct property *prop = of_find_property(cpun, "reg" , NULL);
u32 *regs;
if (!prop) {
pr_warn("CPU node missing reg property\n" );
return false ;
}
regs = prop->value;
this_cpu_id = regs[0 ] & 0 x0fffffff;
} else {
this_cpu_id = of_getintprop_default(cpun, mid_prop, -1 );
if (this_cpu_id < 0 ) {
mid_prop = "cpuid" ;
this_cpu_id = of_getintprop_default(cpun, mid_prop, -1 );
}
if (this_cpu_id < 0 ) {
pr_warn("CPU node missing cpu ID property\n" );
return false ;
}
}
if (this_cpu_id == cpu) {
if (thread) {
int proc_id = cpu_data(cpu).proc_id;
/* On sparc64, the cpu thread information is obtained
* either from OBP or the machine description . We ' ve
* actually probed this information already long before
* this interface gets called so instead of interrogating
* both the OF node and the MDESC again , just use what
* we discovered already .
*/
if (proc_id < 0 )
proc_id = 0 ;
*thread = proc_id;
}
return true ;
}
return false ;
}
static void *of_iterate_over_cpus(void *(*func)(struct device_node *, int , int ), int arg)
{
struct device_node *dp;
const char *mid_prop;
mid_prop = get_mid_prop();
for_each_node_by_type(dp, "cpu" ) {
int cpuid = of_getintprop_default(dp, mid_prop, -1 );
const char *this_mid_prop = mid_prop;
void *ret;
if (cpuid < 0 ) {
this_mid_prop = "cpuid" ;
cpuid = of_getintprop_default(dp, this_mid_prop, -1 );
}
if (cpuid < 0 ) {
prom_printf("OF: Serious problem, cpu lacks "
"%s property" , this_mid_prop);
prom_halt();
}
#ifdef CONFIG_SMP
if (cpuid >= NR_CPUS) {
printk(KERN_WARNING "Ignoring CPU %d which is "
">= NR_CPUS (%d)\n" ,
cpuid, NR_CPUS);
continue ;
}
#endif
ret = func(dp, cpuid, arg);
if (ret)
return ret;
}
return NULL;
}
static void *check_cpu_node(struct device_node *dp, int cpuid, int id)
{
if (id == cpuid)
return dp;
return NULL;
}
struct device_node *of_find_node_by_cpuid(int cpuid)
{
return of_iterate_over_cpus(check_cpu_node, cpuid);
}
static void *record_one_cpu(struct device_node *dp, int cpuid, int arg)
{
ncpus_probed++;
#ifdef CONFIG_SMP
set_cpu_present(cpuid, true );
if (num_possible_cpus() < nr_cpu_ids)
set_cpu_possible(cpuid, true );
#endif
return NULL;
}
void __init of_populate_present_mask(void )
{
if (tlb_type == hypervisor)
return ;
ncpus_probed = 0 ;
of_iterate_over_cpus(record_one_cpu, 0 );
}
static void *fill_in_one_cpu(struct device_node *dp, int cpuid, int arg)
{
struct device_node *portid_parent = NULL;
int portid = -1 ;
if (of_property_present(dp, "cpuid" )) {
int limit = 2 ;
portid_parent = dp;
while (limit--) {
portid_parent = portid_parent->parent;
if (!portid_parent)
break ;
portid = of_getintprop_default(portid_parent,
"portid" , -1 );
if (portid >= 0 )
break ;
}
}
#ifndef CONFIG_SMP
/* On uniprocessor we only want the values for the
* real physical cpu the kernel booted onto , however
* cpu_data ( ) only has one entry at index 0 .
*/
if (cpuid != real_hard_smp_processor_id())
return NULL;
cpuid = 0 ;
#endif
cpu_data(cpuid).clock_tick =
of_getintprop_default(dp, "clock-frequency" , 0 );
if (portid_parent) {
cpu_data(cpuid).dcache_size =
of_getintprop_default(dp, "l1-dcache-size" ,
16 * 1024 );
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);
}
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