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indirect_pci.c

/*
 * Support for indirect PCI bridges.
 *
 * Copyright (C) 1998 Gabriel Paubert.
 *
 * 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/delay.h>
#include <linux/string.h>
#include <linux/init.h>

#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>

#ifdef CONFIG_PPC_INDIRECT_PCI_BE
#define PCI_CFG_OUT out_be32
#else
#define PCI_CFG_OUT out_le32
#endif

static int
indirect_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
                 int len, u32 *val)
{
      struct pci_controller *hose = bus->sysdata;
      volatile void __iomem *cfg_data;
      u8 cfg_type = 0;

      if (ppc_md.pci_exclude_device)
            if (ppc_md.pci_exclude_device(bus->number, devfn))
                  return PCIBIOS_DEVICE_NOT_FOUND;

      if (hose->set_cfg_type)
            if (bus->number != hose->first_busno)
                  cfg_type = 1;

      PCI_CFG_OUT(hose->cfg_addr,
             (0x80000000 | ((bus->number - hose->bus_offset) << 16)
              | (devfn << 8) | ((offset & 0xfc) | cfg_type)));

      /*
       * Note: the caller has already checked that offset is
       * suitably aligned and that len is 1, 2 or 4.
       */
      cfg_data = hose->cfg_data + (offset & 3);
      switch (len) {
      case 1:
            *val = in_8(cfg_data);
            break;
      case 2:
            *val = in_le16(cfg_data);
            break;
      default:
            *val = in_le32(cfg_data);
            break;
      }
      return PCIBIOS_SUCCESSFUL;
}

static int
indirect_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
                  int len, u32 val)
{
      struct pci_controller *hose = bus->sysdata;
      volatile void __iomem *cfg_data;
      u8 cfg_type = 0;

      if (ppc_md.pci_exclude_device)
            if (ppc_md.pci_exclude_device(bus->number, devfn))
                  return PCIBIOS_DEVICE_NOT_FOUND;

      if (hose->set_cfg_type)
            if (bus->number != hose->first_busno)
                  cfg_type = 1;

      PCI_CFG_OUT(hose->cfg_addr,
             (0x80000000 | ((bus->number - hose->bus_offset) << 16)
              | (devfn << 8) | ((offset & 0xfc) | cfg_type)));

      /*
       * Note: the caller has already checked that offset is
       * suitably aligned and that len is 1, 2 or 4.
       */
      cfg_data = hose->cfg_data + (offset & 3);
      switch (len) {
      case 1:
            out_8(cfg_data, val);
            break;
      case 2:
            out_le16(cfg_data, val);
            break;
      default:
            out_le32(cfg_data, val);
            break;
      }
      return PCIBIOS_SUCCESSFUL;
}

static struct pci_ops indirect_pci_ops =
{
      indirect_read_config,
      indirect_write_config
};

void __init
setup_indirect_pci_nomap(struct pci_controller* hose, void __iomem * cfg_addr,
      void __iomem * cfg_data)
{
      hose->cfg_addr = cfg_addr;
      hose->cfg_data = cfg_data;
      hose->ops = &indirect_pci_ops;
}

void __init
setup_indirect_pci(struct pci_controller* hose, u32 cfg_addr, u32 cfg_data)
{
      unsigned long base = cfg_addr & PAGE_MASK;
      void __iomem *mbase, *addr, *data;

      mbase = ioremap(base, PAGE_SIZE);
      addr = mbase + (cfg_addr & ~PAGE_MASK);
      if ((cfg_data & PAGE_MASK) != base)
            mbase = ioremap(cfg_data & PAGE_MASK, PAGE_SIZE);
      data = mbase + (cfg_data & ~PAGE_MASK);
      setup_indirect_pci_nomap(hose, addr, data);
}

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