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("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
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.