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