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