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c8a1634145
The call to grackle_set_stg() ("Store Gathering") has always been inside
an #ifdef 0, since the code was first merged in v2.3.43pre7.
Apparently it was suspected of causing problems on some hardware so was
disabled. No one has ever proved otherwise so drop the code as unused
for now.
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Bjorn Helgaas <helgaas@kernel.org>
Closes: https://lore.kernel.org/all/20231031145600.GA9161@bhelgaas/
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231113051929.1952351-1-mpe@ellerman.id.au
44 lines
1.2 KiB
C
44 lines
1.2 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_LOOPSNOOP 0x00000010
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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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}
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