xref: /linux/arch/powerpc/sysdev/grackle.c (revision 830825d6c37a28061c0b6ca538a6411001cf3b2a)
1*830825d6SPaul Mackerras /*
2*830825d6SPaul Mackerras  * Functions for setting up and using a MPC106 northbridge
3*830825d6SPaul Mackerras  * Extracted from arch/powerpc/platforms/powermac/pci.c.
4*830825d6SPaul Mackerras  *
5*830825d6SPaul Mackerras  * Copyright (C) 2003 Benjamin Herrenschmuidt (benh@kernel.crashing.org)
6*830825d6SPaul Mackerras  * Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
7*830825d6SPaul Mackerras  *
8*830825d6SPaul Mackerras  * This program is free software; you can redistribute it and/or
9*830825d6SPaul Mackerras  * modify it under the terms of the GNU General Public License
10*830825d6SPaul Mackerras  * as published by the Free Software Foundation; either version
11*830825d6SPaul Mackerras  * 2 of the License, or (at your option) any later version.
12*830825d6SPaul Mackerras  */
13*830825d6SPaul Mackerras #include <linux/kernel.h>
14*830825d6SPaul Mackerras #include <linux/pci.h>
15*830825d6SPaul Mackerras #include <linux/init.h>
16*830825d6SPaul Mackerras 
17*830825d6SPaul Mackerras #include <asm/io.h>
18*830825d6SPaul Mackerras #include <asm/prom.h>
19*830825d6SPaul Mackerras #include <asm/pci-bridge.h>
20*830825d6SPaul Mackerras #include <asm/grackle.h>
21*830825d6SPaul Mackerras 
22*830825d6SPaul Mackerras #define GRACKLE_CFA(b, d, o)	(0x80 | ((b) << 8) | ((d) << 16) \
23*830825d6SPaul Mackerras 				 | (((o) & ~3) << 24))
24*830825d6SPaul Mackerras 
25*830825d6SPaul Mackerras #define GRACKLE_PICR1_STG		0x00000040
26*830825d6SPaul Mackerras #define GRACKLE_PICR1_LOOPSNOOP		0x00000010
27*830825d6SPaul Mackerras 
28*830825d6SPaul Mackerras /* N.B. this is called before bridges is initialized, so we can't
29*830825d6SPaul Mackerras    use grackle_pcibios_{read,write}_config_dword. */
30*830825d6SPaul Mackerras static inline void grackle_set_stg(struct pci_controller* bp, int enable)
31*830825d6SPaul Mackerras {
32*830825d6SPaul Mackerras 	unsigned int val;
33*830825d6SPaul Mackerras 
34*830825d6SPaul Mackerras 	out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
35*830825d6SPaul Mackerras 	val = in_le32(bp->cfg_data);
36*830825d6SPaul Mackerras 	val = enable? (val | GRACKLE_PICR1_STG) :
37*830825d6SPaul Mackerras 		(val & ~GRACKLE_PICR1_STG);
38*830825d6SPaul Mackerras 	out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
39*830825d6SPaul Mackerras 	out_le32(bp->cfg_data, val);
40*830825d6SPaul Mackerras 	(void)in_le32(bp->cfg_data);
41*830825d6SPaul Mackerras }
42*830825d6SPaul Mackerras 
43*830825d6SPaul Mackerras static inline void grackle_set_loop_snoop(struct pci_controller *bp, int enable)
44*830825d6SPaul Mackerras {
45*830825d6SPaul Mackerras 	unsigned int val;
46*830825d6SPaul Mackerras 
47*830825d6SPaul Mackerras 	out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
48*830825d6SPaul Mackerras 	val = in_le32(bp->cfg_data);
49*830825d6SPaul Mackerras 	val = enable? (val | GRACKLE_PICR1_LOOPSNOOP) :
50*830825d6SPaul Mackerras 		(val & ~GRACKLE_PICR1_LOOPSNOOP);
51*830825d6SPaul Mackerras 	out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
52*830825d6SPaul Mackerras 	out_le32(bp->cfg_data, val);
53*830825d6SPaul Mackerras 	(void)in_le32(bp->cfg_data);
54*830825d6SPaul Mackerras }
55*830825d6SPaul Mackerras 
56*830825d6SPaul Mackerras void __init setup_grackle(struct pci_controller *hose)
57*830825d6SPaul Mackerras {
58*830825d6SPaul Mackerras 	setup_indirect_pci(hose, 0xfec00000, 0xfee00000);
59*830825d6SPaul Mackerras 	if (machine_is_compatible("AAPL,PowerBook1998"))
60*830825d6SPaul Mackerras 		grackle_set_loop_snoop(hose, 1);
61*830825d6SPaul Mackerras #if 0	/* Disabled for now, HW problems ??? */
62*830825d6SPaul Mackerras 	grackle_set_stg(hose, 1);
63*830825d6SPaul Mackerras #endif
64*830825d6SPaul Mackerras }
65