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. */ 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 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 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