2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 <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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