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. */
grackle_set_stg(struct pci_controller * bp,int enable)30 static 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
grackle_set_loop_snoop(struct pci_controller * bp,int enable)43 static 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
setup_grackle(struct pci_controller * hose)56 void __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 }
67