// 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 sparc32 by David S . Miller davem @ davemloft . net
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/memblock.h>
#include <asm /prom.h>
#include <asm /oplib.h>
#include <asm /leon.h>
#include <asm /leon_amba.h>
#include "prom.h"
void * __init prom_early_alloc(unsigned long size)
{
void *ret;
ret = memblock_alloc_or_panic(size, SMP_CACHE_BYTES);
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)
{
const char *name = of_get_property(dp, "name" , NULL);
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" ,
name,
regs->which_io, regs->phys_addr);
}
/* "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@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_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@irq,addrlo" */
static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf)
{
const char *name = of_get_property(dp, "name" , NULL);
struct amba_prom_registers *regs;
unsigned int *intr;
unsigned int reg0;
struct property *prop;
int interrupt = 0 ;
/* In order to get a unique ID in the device tree (multiple AMBA devices
* may have the same name ) the node number is printed
*/
prop = of_find_property(dp, "reg" , NULL);
if (!prop) {
reg0 = (unsigned int )dp->phandle;
} else {
regs = prop->value;
reg0 = regs->phys_addr;
}
/* Not all cores have Interrupt */
prop = of_find_property(dp, "interrupts" , NULL);
if (!prop)
intr = &interrupt; /* IRQ0 does not exist */
else
intr = prop->value;
sprintf(tmp_buf, "%s@%x,%x" , name, *intr, reg0);
}
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" ))
return pci_path_component(dp, tmp_buf);
if (of_node_is_type(parent, "sbus" ))
return sbus_path_component(dp, tmp_buf);
if (of_node_is_type(parent, "ebus" ))
return ebus_path_component(dp, tmp_buf);
if (of_node_is_type(parent, "ambapp" ))
return ambapp_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)
{
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;
}
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 ;
fallthrough;
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;
sprintf(of_console_path, "%pOF" , dp);
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);
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;
if (prom_vers == PROM_V2) {
sprintf(of_console_path, "%pOF" , dp);
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;
}
printk(msg, of_console_path);
}
void __init of_fill_in_cpu_data(void )
{
}
void __init irq_trans_init(struct device_node *dp)
{
}
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