path: root/arch/powerpc/platforms/powermac/pci.c

/*
 * Support for PCI bridges found on Power Macintoshes.
 *
 * Copyright (C) 2003 Benjamin Herrenschmuidt (benh@kernel.crashing.org)
 * Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
 *
 * 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/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>

#include <asm/sections.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/grackle.h>
#ifdef CONFIG_PPC64
#include <asm/iommu.h>
#include <asm/ppc-pci.h>
#endif

#undef DEBUG

#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif

static int add_bridge(struct device_node *dev);

/* XXX Could be per-controller, but I don't think we risk anything by
 * assuming we won't have both UniNorth and Bandit */
static int has_uninorth;
#ifdef CONFIG_PPC64
static struct pci_controller *u3_agp;
static struct pci_controller *u3_ht;
#endif /* CONFIG_PPC64 */

extern u8 pci_cache_line_size;
extern int pcibios_assign_bus_offset;

struct device_node *k2_skiplist[2];

/*
 * Magic constants for enabling cache coherency in the bandit/PSX bridge.
 */
#define BANDIT_DEVID_2	8
#define BANDIT_REVID	3

#define BANDIT_DEVNUM	11
#define BANDIT_MAGIC	0x50
#define BANDIT_COHERENT	0x40

static int __init fixup_one_level_bus_range(struct device_node *node, int higher)
{
	for (; node != 0;node = node->sibling) {
		int * bus_range;
		unsigned int *class_code;
		int len;

		/* For PCI<->PCI bridges or CardBus bridges, we go down */
		class_code = (unsigned int *) get_property(node, "class-code", NULL);
		if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
			continue;
		bus_range = (int *) get_property(node, "bus-range", &len);
		if (bus_range != NULL && len > 2 * sizeof(int)) {
			if (bus_range[1] > higher)
				higher = bus_range[1];
		}
		higher = fixup_one_level_bus_range(node->child, higher);
	}
	return higher;
}

/* This routine fixes the "bus-range" property of all bridges in the
 * system since they tend to have their "last" member wrong on macs
 *
 * Note that the bus numbers manipulated here are OF bus numbers, they
 * are not Linux bus numbers.
 */
static void __init fixup_bus_range(struct device_node *bridge)
{
	int * bus_range;
	int len;

	/* Lookup the "bus-range" property for the hose */
	bus_range = (int *) get_property(bridge, "bus-range", &len);
	if (bus_range == NULL || len < 2 * sizeof(int)) {
		printk(KERN_WARNING "Can't get bus-range for %s\n",
			       bridge->full_name);
		return;
	}
	bus_range[1] = fixup_one_level_bus_range(bridge->child, bus_range[1]);
}

/*
 * Apple MacRISC (U3, UniNorth, Bandit, Chaos) PCI controllers.
 *
 * The "Bandit" version is present in all early PCI PowerMacs,
 * and up to the first ones using Grackle. Some machines may
 * have 2 bandit controllers (2 PCI busses).
 *
 * "Chaos" is used in some "Bandit"-type machines as a bridge
 * for the separate display bus. It is accessed the same
 * way as bandit, but cannot be probed for devices. It therefore
 * has its own config access functions.
 *
 * The "UniNorth" version is present in all Core99 machines
 * (iBook, G4, new IMacs, and all the recent Apple machines).
 * It contains 3 controllers in one ASIC.
 *
 * The U3 is the bridge used on G5 machines. It contains an
 * AGP bus which is dealt with the old UniNorth access routines
 * and a HyperTransport bus which uses its own set of access
 * functions.
 */

#define MACRISC_CFA0(devfn, off)	\
	((1 << (unsigned long)PCI_SLOT(dev_fn)) \
	| (((unsigned long)PCI_FUNC(dev_fn)) << 8) \
	| (((unsigned long)(off)) & 0xFCUL))

#define MACRISC_CFA1(bus, devfn, off)	\
	((((unsigned long)(bus)) << 16) \
	|(((unsigned long)(devfn)) << 8) \
	|(((unsigned long)(off)) & 0xFCUL) \
	|1UL)

static unsigned long macrisc_cfg_access(struct pci_controller