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grackle.c

/*
 * 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)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#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 (machine_is_compatible("PowerMac1,1"))
            pci_assign_all_buses = 1;
      if (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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