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_STG		0x00000040
22#define GRACKLE_PICR1_LOOPSNOOP		0x00000010
23
24/* N.B. this is called before bridges is initialized, so we can't
25   use grackle_pcibios_{read,write}_config_dword. */
26static inline void grackle_set_stg(struct pci_controller* bp, int enable)
27{
28	unsigned int val;
29
30	out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
31	val = in_le32(bp->cfg_data);
32	val = enable? (val | GRACKLE_PICR1_STG) :
33		(val & ~GRACKLE_PICR1_STG);
34	out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
35	out_le32(bp->cfg_data, val);
36	(void)in_le32(bp->cfg_data);
37}
38
39static inline void grackle_set_loop_snoop(struct pci_controller *bp, int enable)
40{
41	unsigned int val;
42
43	out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
44	val = in_le32(bp->cfg_data);
45	val = enable? (val | GRACKLE_PICR1_LOOPSNOOP) :
46		(val & ~GRACKLE_PICR1_LOOPSNOOP);
47	out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
48	out_le32(bp->cfg_data, val);
49	(void)in_le32(bp->cfg_data);
50}
51
52void __init setup_grackle(struct pci_controller *hose)
53{
54	setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0);
55	if (of_machine_is_compatible("PowerMac1,1"))
56		pci_add_flags(PCI_REASSIGN_ALL_BUS);
57	if (of_machine_is_compatible("AAPL,PowerBook1998"))
58		grackle_set_loop_snoop(hose, 1);
59#if 0	/* Disabled for now, HW problems ??? */
60	grackle_set_stg(hose, 1);
61#endif
62}

 
 1/*
 2 * Functions for setting up and using a MPC106 northbridge
 3 * Extracted from arch/powerpc/platforms/powermac/pci.c.
 4 *
 5 * Copyright (C) 2003 Benjamin Herrenschmuidt (benh@kernel.crashing.org)
 6 * Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
 7 *
 8 * This program is free software; you can redistribute it and/or
 9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13#include <linux/kernel.h>
14#include <linux/pci.h>
15#include <linux/init.h>
 
16
17#include <asm/io.h>
18#include <asm/prom.h>
19#include <asm/pci-bridge.h>
20#include <asm/grackle.h>
21
22#define GRACKLE_CFA(b, d, o)	(0x80 | ((b) << 8) | ((d) << 16) \
23				 | (((o) & ~3) << 24))
24
25#define GRACKLE_PICR1_STG		0x00000040
26#define GRACKLE_PICR1_LOOPSNOOP		0x00000010
27
28/* N.B. this is called before bridges is initialized, so we can't
29   use grackle_pcibios_{read,write}_config_dword. */
30static inline void grackle_set_stg(struct pci_controller* bp, int enable)
31{
32	unsigned int val;
33
34	out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
35	val = in_le32(bp->cfg_data);
36	val = enable? (val | GRACKLE_PICR1_STG) :
37		(val & ~GRACKLE_PICR1_STG);
38	out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
39	out_le32(bp->cfg_data, val);
40	(void)in_le32(bp->cfg_data);
41}
42
43static inline void grackle_set_loop_snoop(struct pci_controller *bp, int enable)
44{
45	unsigned int val;
46
47	out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
48	val = in_le32(bp->cfg_data);
49	val = enable? (val | GRACKLE_PICR1_LOOPSNOOP) :
50		(val & ~GRACKLE_PICR1_LOOPSNOOP);
51	out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
52	out_le32(bp->cfg_data, val);
53	(void)in_le32(bp->cfg_data);
54}
55
56void __init setup_grackle(struct pci_controller *hose)
57{
58	setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0);
59	if (of_machine_is_compatible("PowerMac1,1"))
60		pci_add_flags(PCI_REASSIGN_ALL_BUS);
61	if (of_machine_is_compatible("AAPL,PowerBook1998"))
62		grackle_set_loop_snoop(hose, 1);
63#if 0	/* Disabled for now, HW problems ??? */
64	grackle_set_stg(hose, 1);
65#endif
66}