| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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| 2 | /* |
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| 3 | * Functions for setting up and using a MPC106 northbridge |
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| 4 | * Extracted from arch/powerpc/platforms/powermac/pci.c. |
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| 5 | * |
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| 6 | * Copyright (C) 2003 Benjamin Herrenschmuidt (benh@kernel.crashing.org) |
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| 7 | * Copyright (C) 1997 Paul Mackerras (paulus@samba.org) |
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| 8 | */ |
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| 9 | #include <linux/kernel.h> |
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| 10 | #include <linux/pci.h> |
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| 11 | #include <linux/init.h> |
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| 12 | #include <linux/of.h> |
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| 13 | |
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| 14 | #include <asm/io.h> |
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| 15 | #include <asm/pci-bridge.h> |
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| 16 | #include <asm/grackle.h> |
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| 17 | |
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| 18 | #define GRACKLE_CFA(b, d, o) (0x80 | ((b) << 8) | ((d) << 16) \ |
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| 19 | | (((o) & ~3) << 24)) |
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| 20 | |
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| 21 | #define GRACKLE_PICR1_LOOPSNOOP 0x00000010 |
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| 22 | |
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| 23 | static inline void grackle_set_loop_snoop(struct pci_controller *bp, int enable) |
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| 24 | { |
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| 25 | unsigned int val; |
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| 26 | |
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| 27 | out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8)); |
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| 28 | val = in_le32(bp->cfg_data); |
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| 29 | val = enable? (val | GRACKLE_PICR1_LOOPSNOOP) : |
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| 30 | (val & ~GRACKLE_PICR1_LOOPSNOOP); |
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| 31 | out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8)); |
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| 32 | out_le32(bp->cfg_data, val); |
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| 33 | (void)in_le32(bp->cfg_data); |
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| 34 | } |
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| 35 | |
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| 36 | void __init setup_grackle(struct pci_controller *hose) |
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| 37 | { |
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| 38 | setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0); |
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| 39 | if (of_machine_is_compatible(compat: "PowerMac1,1" )) |
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| 40 | pci_add_flags(flags: PCI_REASSIGN_ALL_BUS); |
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| 41 | if (of_machine_is_compatible(compat: "AAPL,PowerBook1998" )) |
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| 42 | grackle_set_loop_snoop(bp: hose, enable: 1); |
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| 43 | } |
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| 44 | |
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