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