LXR linux/arch/powerpc/sysdev/grackle.c

   1/*
   2 * Functions for setting up and using a MPC106 northbridge
   3 * Extracted from arch/powerpc/platforms/powermac/pci.c.
   4 *
   5 * Copyright (C) 2003 Benjamin Herrenschmuidt (benh@kernel.crashing.org)
   6 * Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License
  10 * as published by the Free Software Foundation; either version
  11 * 2 of the License, or (at your option) any later version.
  12 */
  13#include <linux/kernel.h>
  14#include <linux/pci.h>
  15#include <linux/init.h>
  16
  17#include <asm/io.h>
  18#include <asm/prom.h>
  19#include <asm/pci-bridge.h>
  20#include <asm/grackle.h>
  21
  22#define GRACKLE_CFA(b, d, o)    (0x80 | ((b) << 8) | ((d) << 16) \
  23                                 | (((o) & ~3) << 24))
  24
  25#define GRACKLE_PICR1_STG               0x00000040
  26#define GRACKLE_PICR1_LOOPSNOOP         0x00000010
  27
  28/* N.B. this is called before bridges is initialized, so we can't
  29   use grackle_pcibios_{read,write}_config_dword. */
  30static inline void grackle_set_stg(struct pci_controller* bp, int enable)
  31{
  32        unsigned int val;
  33
  34        out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
  35        val = in_le32(bp->cfg_data);
  36        val = enable? (val | GRACKLE_PICR1_STG) :
  37                (val & ~GRACKLE_PICR1_STG);
  38        out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
  39        out_le32(bp->cfg_data, val);
  40        (void)in_le32(bp->cfg_data);
  41}
  42
  43static inline void grackle_set_loop_snoop(struct pci_controller *bp, int enable)
  44{
  45        unsigned int val;
  46
  47        out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
  48        val = in_le32(bp->cfg_data);
  49        val = enable? (val | GRACKLE_PICR1_LOOPSNOOP) :
  50                (val & ~GRACKLE_PICR1_LOOPSNOOP);
  51        out_be32(bp->cfg_addr, GRACKLE_CFA(0, 0, 0xa8));
  52        out_le32(bp->cfg_data, val);
  53        (void)in_le32(bp->cfg_data);
  54}
  55
  56void __init setup_grackle(struct pci_controller *hose)
  57{
  58        setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0);
  59        if (of_machine_is_compatible("PowerMac1,1"))
  60                pci_add_flags(PCI_REASSIGN_ALL_BUS);
  61        if (of_machine_is_compatible("AAPL,PowerBook1998"))
  62                grackle_set_loop_snoop(hose, 1);
  63#if 0   /* Disabled for now, HW problems ??? */
  64        grackle_set_stg(hose, 1);
  65#endif
  66}
  67