63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
// 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 (benh@kernel.crashing.org)
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* Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
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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 <linux/of.h>
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#include <asm/io.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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