path: root/arch/ppc/syslib/prom.c

/*
 * Procedures for interfacing to the Open Firmware PROM on
 * Power Macintosh computers.
 *
 * In particular, we are interested in the device tree
 * and in using some of its services (exit, write to stdout).
 *
 * Paul Mackerras	August 1996.
 * Copyright (C) 1996 Paul Mackerras.
 */
#include <stdarg.h>
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/bitops.h>

#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/bootx.h>
#include <asm/system.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/bootinfo.h>
#include <asm/btext.h>
#include <asm/pci-bridge.h>
#include <asm/open_pic.h>


struct pci_address {
	unsigned a_hi;
	unsigned a_mid;
	unsigned a_lo;
};

struct pci_reg_property {
	struct pci_address addr;
	unsigned size_hi;
	unsigned size_lo;
};

struct isa_reg_property {
	unsigned space;
	unsigned address;
	unsigned size;
};

typedef unsigned long interpret_func(struct device_node *, unsigned long,
				     int, int);
static interpret_func interpret_pci_props;
static interpret_func interpret_dbdma_props;
static interpret_func interpret_isa_props;
static interpret_func interpret_macio_props;
static interpret_func interpret_root_props;

extern char *klimit;

/* Set for a newworld or CHRP machine */
int use_of_interrupt_tree;
struct device_node *dflt_interrupt_controller;
int num_interrupt_controllers;

extern unsigned int rtas_entry;  /* physical pointer */

extern struct device_node *allnodes;

static unsigned long finish_node(struct device_node *, unsigned long,
				 interpret_func *, int, int);
static unsigned long finish_node_interrupts(struct device_node *, unsigned long);
static struct device_node *find_phandle(phandle);

extern void enter_rtas(void *);
void phys_call_rtas(int, int, int, ...);

extern char cmd_line[512];	/* XXX */
extern boot_infos_t *boot_infos;
unsigned long dev_tree_size;

void
phys_call_rtas(int service, int nargs, int nret, ...)
{
	va_list list;
	union {
		unsigned long words[16];
		double align;
	} u;
	void (*rtas)(void *, unsigned long);
	int i;

	u.words[0] = service;
	u.words[1] = nargs;
	u.words[2] = nret;
	va_start(list, nret);
	for (i = 0; i < nargs; ++i)
		u.words[i+3] = va_arg(list, unsigned long);
	va_end(list);

	rtas = (void (*)(void *, unsigned long)) rtas_entry;
	rtas(&u, rtas_data);
}

/*
 * finish_device_tree is called once things are running normally
 * (i.e. with text and data mapped to the address they were linked at).
 * It traverses the device tree and fills in the name, type,
 * {n_}addrs and {n_}intrs fields of each node.
 */
void __init
finish_device_tree(void)
{
	unsigned long mem = (unsigned long) klimit;
	struct device_node *np;

	/* All CHRPs now use the interrupt tree */
	for (np = allnodes; np != NULL; np = np->allnext) {
		if (get_property(np, "interrupt-parent", NULL)) {
			use_of_interrupt_tree = 1;
			break;
		}
	}

	if (use_of_interrupt_tree) {
		/*
		 * We want to find out here how many interrupt-controller
		 * nodes there are, and if we are booted from BootX,
		 * we need a pointer to the first (and hopefully only)
		 * such node.  But we can't use find_devices here since
		 * np->name