![Konrad Eisele](/assets/img/avatar_default.png)
The device is a AMBA bus if it is a child of prom node "ambapp" (AMBA plug and play). Two functions leon_trans_init() and leon_node_init() (defined in sparc/kernel/leon_kernel.c) are called in the prom_build_tree() path if CONFIG_SPARC_LEON is defined. leon_node_init() will build up the device tree using AMBA plug and play. Also: a extra check was addes to prom_common.c:build_one_prop() in case a rom-node is undefined which can happen for SPARC-LEON because it creates only a minimum nodes to emulate sparc behaviour. Signed-off-by: Konrad Eisele <konrad@gaisler.com> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
329 lines
7.3 KiB
C
329 lines
7.3 KiB
C
/*
|
|
* 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 <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/module.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 = __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);
|
|
}
|
|
|
|
/* "name:vendor:device@irq,addrlo" */
|
|
static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf)
|
|
{
|
|
struct amba_prom_registers *regs; unsigned int *intr;
|
|
unsigned int *device, *vendor;
|
|
struct property *prop;
|
|
|
|
prop = of_find_property(dp, "reg", NULL);
|
|
if (!prop)
|
|
return;
|
|
regs = prop->value;
|
|
prop = of_find_property(dp, "interrupts", NULL);
|
|
if (!prop)
|
|
return;
|
|
intr = prop->value;
|
|
prop = of_find_property(dp, "vendor", NULL);
|
|
if (!prop)
|
|
return;
|
|
vendor = prop->value;
|
|
prop = of_find_property(dp, "device", NULL);
|
|
if (!prop)
|
|
return;
|
|
device = prop->value;
|
|
|
|
sprintf(tmp_buf, "%s:%d:%d@%x,%x",
|
|
dp->name, *vendor, *device,
|
|
*intr, 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);
|
|
if (!strcmp(parent->type, "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)
|
|
{
|
|
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)
|
|
{
|
|
}
|
|
|
|
void __init irq_trans_init(struct device_node *dp)
|
|
{
|
|
}
|