LXR linux/arch/ppc/syslib/indirect

   1/*
   2 * Support for indirect PCI bridges.
   3 *
   4 * Copyright (C) 1998 Gabriel Paubert.
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11
  12#include <linux/kernel.h>
  13#include <linux/pci.h>
  14#include <linux/delay.h>
  15#include <linux/string.h>
  16#include <linux/init.h>
  17
  18#include <asm/io.h>
  19#include <asm/prom.h>
  20#include <asm/pci-bridge.h>
  21#include <asm/machdep.h>
  22
  23#ifdef CONFIG_PPC_INDIRECT_PCI_BE
  24#define PCI_CFG_OUT out_be32
  25#else
  26#define PCI_CFG_OUT out_le32
  27#endif
  28
  29static int
  30indirect_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
  31                     int len, u32 *val)
  32{
  33        struct pci_controller *hose = bus->sysdata;
  34        volatile void __iomem *cfg_data;
  35        u8 cfg_type = 0;
  36
  37        if (ppc_md.pci_exclude_device)
  38                if (ppc_md.pci_exclude_device(bus->number, devfn))
  39                        return PCIBIOS_DEVICE_NOT_FOUND;
  40
  41        if (hose->set_cfg_type)
  42                if (bus->number != hose->first_busno)
  43                        cfg_type = 1;
  44
  45        PCI_CFG_OUT(hose->cfg_addr,
  46                 (0x80000000 | ((bus->number - hose->bus_offset) << 16)
  47                  | (devfn << 8) | ((offset & 0xfc) | cfg_type)));
  48
  49        /*
  50         * Note: the caller has already checked that offset is
  51         * suitably aligned and that len is 1, 2 or 4.
  52         */
  53        cfg_data = hose->cfg_data + (offset & 3);
  54        switch (len) {
  55        case 1:
  56                *val = in_8(cfg_data);
  57                break;
  58        case 2:
  59                *val = in_le16(cfg_data);
  60                break;
  61        default:
  62                *val = in_le32(cfg_data);
  63                break;
  64        }
  65        return PCIBIOS_SUCCESSFUL;
  66}
  67
  68static int
  69indirect_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
  70                      int len, u32 val)
  71{
  72        struct pci_controller *hose = bus->sysdata;
  73        volatile void __iomem *cfg_data;
  74        u8 cfg_type = 0;
  75
  76        if (ppc_md.pci_exclude_device)
  77                if (ppc_md.pci_exclude_device(bus->number, devfn))
  78                        return PCIBIOS_DEVICE_NOT_FOUND;
  79
  80        if (hose->set_cfg_type)
  81                if (bus->number != hose->first_busno)
  82                        cfg_type = 1;
  83
  84        PCI_CFG_OUT(hose->cfg_addr,
  85                 (0x80000000 | ((bus->number - hose->bus_offset) << 16)
  86                  | (devfn << 8) | ((offset & 0xfc) | cfg_type)));
  87
  88        /*
  89         * Note: the caller has already checked that offset is
  90         * suitably aligned and that len is 1, 2 or 4.
  91         */
  92        cfg_data = hose->cfg_data + (offset & 3);
  93        switch (len) {
  94        case 1:
  95                out_8(cfg_data, val);
  96                break;
  97        case 2:
  98                out_le16(cfg_data, val);
  99                break;
 100        default:
 101                out_le32(cfg_data, val);
 102                break;
 103        }
 104        return PCIBIOS_SUCCESSFUL;
 105}
 106
 107static struct pci_ops indirect_pci_ops =
 108{
 109        indirect_read_config,
 110        indirect_write_config
 111};
 112
 113void __init
 114setup_indirect_pci_nomap(struct pci_controller* hose, void __iomem * cfg_addr,
 115        void __iomem * cfg_data)
 116{
 117        hose->cfg_addr = cfg_addr;
 118        hose->cfg_data = cfg_data;
 119        hose->ops = &indirect_pci_ops;
 120}
 121
 122void __init
 123setup_indirect_pci(struct pci_controller* hose, u32 cfg_addr, u32 cfg_data)
 124{
 125        unsigned long base = cfg_addr & PAGE_MASK;
 126        void __iomem *mbase, *addr, *data;
 127
 128        mbase = ioremap(base, PAGE_SIZE);
 129        addr = mbase + (cfg_addr & ~PAGE_MASK);
 130        if ((cfg_data & PAGE_MASK) != base)
 131                mbase = ioremap(cfg_data & PAGE_MASK, PAGE_SIZE);
 132        data = mbase + (cfg_data & ~PAGE_MASK);
 133        setup_indirect_pci_nomap(hose, addr, data);
 134}
 135