1830825d6SPaul Mackerras /* 2830825d6SPaul Mackerras * Functions for setting up and using a MPC106 northbridge 3830825d6SPaul Mackerras * Extracted from arch/powerpc/platforms/powermac/pci.c. 4830825d6SPaul Mackerras * 5830825d6SPaul Mackerras * Copyright (C) 2003 Benjamin Herrenschmuidt (benh@kernel.crashing.org) 6830825d6SPaul Mackerras * Copyright (C) 1997 Paul Mackerras (paulus@samba.org) 7830825d6SPaul Mackerras * 8830825d6SPaul Mackerras * This program is free software; you can redistribute it and/or 9830825d6SPaul Mackerras * modify it under the terms of the GNU General Public License 10830825d6SPaul Mackerras * as published by the Free Software Foundation; either version 11830825d6SPaul Mackerras * 2 of the License, or (at your option) any later version. 12830825d6SPaul Mackerras */ 13830825d6SPaul Mackerras #include <linux/kernel.h> 14830825d6SPaul Mackerras #include <linux/pci.h> 15830825d6SPaul Mackerras #include <linux/init.h> 16830825d6SPaul Mackerras 17830825d6SPaul Mackerras #include <asm/io.h> 18830825d6SPaul Mackerras #include <asm/prom.h> 19830825d6SPaul Mackerras #include <asm/pci-bridge.h> 20830825d6SPaul Mackerras #include <asm/grackle.h> 21830825d6SPaul Mackerras 22830825d6SPaul Mackerras #define GRACKLE_CFA(b, d, o) (0x80 | ((b) << 8) | ((d) << 16) \ 23830825d6SPaul Mackerras | (((o) & ~3) << 24)) 24830825d6SPaul Mackerras 25830825d6SPaul Mackerras #define GRACKLE_PICR1_STG 0x00000040 26830825d6SPaul Mackerras #define GRACKLE_PICR1_LOOPSNOOP 0x00000010 27830825d6SPaul Mackerras 28830825d6SPaul Mackerras /* N.B. this is called before bridges is initialized, so we can't 29830825d6SPaul Mackerras use grackle_pcibios_{read,write}_config_dword. */ 30830825d6SPaul Mackerras static inline void grackle_set_stg(struct pci_controller* bp, int enable) 31830825d6SPaul Mackerras { 32830825d6SPaul Mackerras unsigned int val; 33830825d6SPaul Mackerras 34830825d6SPaul Mackerras out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8)); 35830825d6SPaul Mackerras val = in_le32(bp->cfg_data); 36830825d6SPaul Mackerras val = enable? (val | GRACKLE_PICR1_STG) : 37830825d6SPaul Mackerras (val & ~GRACKLE_PICR1_STG); 38830825d6SPaul Mackerras out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8)); 39830825d6SPaul Mackerras out_le32(bp->cfg_data, val); 40830825d6SPaul Mackerras (void)in_le32(bp->cfg_data); 41830825d6SPaul Mackerras } 42830825d6SPaul Mackerras 43830825d6SPaul Mackerras static inline void grackle_set_loop_snoop(struct pci_controller *bp, int enable) 44830825d6SPaul Mackerras { 45830825d6SPaul Mackerras unsigned int val; 46830825d6SPaul Mackerras 47830825d6SPaul Mackerras out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8)); 48830825d6SPaul Mackerras val = in_le32(bp->cfg_data); 49830825d6SPaul Mackerras val = enable? (val | GRACKLE_PICR1_LOOPSNOOP) : 50830825d6SPaul Mackerras (val & ~GRACKLE_PICR1_LOOPSNOOP); 51830825d6SPaul Mackerras out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8)); 52830825d6SPaul Mackerras out_le32(bp->cfg_data, val); 53830825d6SPaul Mackerras (void)in_le32(bp->cfg_data); 54830825d6SPaul Mackerras } 55830825d6SPaul Mackerras 56830825d6SPaul Mackerras void __init setup_grackle(struct pci_controller *hose) 57830825d6SPaul Mackerras { 58*2e56ff20SKumar Gala setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0); 59a1fdf694SPavel Roskin if (machine_is_compatible("PowerMac1,1")) 60a1fdf694SPavel Roskin pci_assign_all_buses = 1; 61830825d6SPaul Mackerras if (machine_is_compatible("AAPL,PowerBook1998")) 62830825d6SPaul Mackerras grackle_set_loop_snoop(hose, 1); 63830825d6SPaul Mackerras #if 0 /* Disabled for now, HW problems ??? */ 64830825d6SPaul Mackerras grackle_set_stg(hose, 1); 65830825d6SPaul Mackerras #endif 66830825d6SPaul Mackerras } 67