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62 lines
1.8 KiB
62 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Functions for setting up and using a MPC106 northbridge |
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* Extracted from arch/powerpc/platforms/powermac/pci.c. |
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* |
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* Copyright (C) 2003 Benjamin Herrenschmuidt ([email protected]) |
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* Copyright (C) 1997 Paul Mackerras ([email protected]) |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/pci.h> |
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#include <linux/init.h> |
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#include <asm/io.h> |
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#include <asm/prom.h> |
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#include <asm/pci-bridge.h> |
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#include <asm/grackle.h> |
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#define GRACKLE_CFA(b, d, o) (0x80 | ((b) << 8) | ((d) << 16) \ |
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| (((o) & ~3) << 24)) |
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#define GRACKLE_PICR1_STG 0x00000040 |
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#define GRACKLE_PICR1_LOOPSNOOP 0x00000010 |
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/* N.B. this is called before bridges is initialized, so we can't |
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use grackle_pcibios_{read,write}_config_dword. */ |
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static inline void grackle_set_stg(struct pci_controller* bp, int enable) |
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{ |
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unsigned int val; |
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out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8)); |
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val = in_le32(bp->cfg_data); |
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val = enable? (val | GRACKLE_PICR1_STG) : |
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(val & ~GRACKLE_PICR1_STG); |
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out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8)); |
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out_le32(bp->cfg_data, val); |
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(void)in_le32(bp->cfg_data); |
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} |
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static inline void grackle_set_loop_snoop(struct pci_controller *bp, int enable) |
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{ |
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unsigned int val; |
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out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8)); |
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val = in_le32(bp->cfg_data); |
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val = enable? (val | GRACKLE_PICR1_LOOPSNOOP) : |
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(val & ~GRACKLE_PICR1_LOOPSNOOP); |
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out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8)); |
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out_le32(bp->cfg_data, val); |
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(void)in_le32(bp->cfg_data); |
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} |
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void __init setup_grackle(struct pci_controller *hose) |
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{ |
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setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0); |
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if (of_machine_is_compatible("PowerMac1,1")) |
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pci_add_flags(PCI_REASSIGN_ALL_BUS); |
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if (of_machine_is_compatible("AAPL,PowerBook1998")) |
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grackle_set_loop_snoop(hose, 1); |
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#if 0 /* Disabled for now, HW problems ??? */ |
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grackle_set_stg(hose, 1); |
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#endif |
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}
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