1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Functions for setting up and using a MPC106 northbridge
4 * Extracted from arch/powerpc/platforms/powermac/pci.c.
5 *
6 * Copyright (C) 2003 Benjamin Herrenschmuidt (benh@kernel.crashing.org)
7 * Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
8 */
9#include <linux/kernel.h>
10#include <linux/pci.h>
11#include <linux/init.h>
12#include <linux/of.h>
13
14#include <asm/io.h>
15#include <asm/pci-bridge.h>
16#include <asm/grackle.h>
17
18#define GRACKLE_CFA(b, d, o)	(0x80 | ((b) << 8) | ((d) << 16) \
19				 | (((o) & ~3) << 24))
20
21#define GRACKLE_PICR1_LOOPSNOOP		0x00000010
22
23static inline void grackle_set_loop_snoop(struct pci_controller *bp, int enable)
24{
25	unsigned int val;
26
27	out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
28	val = in_le32(bp->cfg_data);
29	val = enable? (val | GRACKLE_PICR1_LOOPSNOOP) :
30		(val & ~GRACKLE_PICR1_LOOPSNOOP);
31	out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
32	out_le32(bp->cfg_data, val);
33	(void)in_le32(bp->cfg_data);
34}
35
36void __init setup_grackle(struct pci_controller *hose)
37{
38	setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0);
39	if (of_machine_is_compatible("PowerMac1,1"))
40		pci_add_flags(PCI_REASSIGN_ALL_BUS);
41	if (of_machine_is_compatible("AAPL,PowerBook1998"))
42		grackle_set_loop_snoop(hose, 1);
43}
44