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 | |
23 | static 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 | |
36 | void __init setup_grackle(struct pci_controller *hose) |
37 | { |
38 | setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0); |
39 | if (of_machine_is_compatible(compat: "PowerMac1,1" )) |
40 | pci_add_flags(flags: PCI_REASSIGN_ALL_BUS); |
41 | if (of_machine_is_compatible(compat: "AAPL,PowerBook1998" )) |
42 | grackle_set_loop_snoop(bp: hose, enable: 1); |
43 | } |
44 | |