LXR linux/arch/microblaze/pci/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 <linux/io.h>
  19#include <asm/prom.h>
  20#include <asm/pci-bridge.h>
  21
  22static int
  23indirect_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
  24                     int len, u32 *val)
  25{
  26        struct pci_controller *hose = pci_bus_to_host(bus);
  27        volatile void __iomem *cfg_data;
  28        u8 cfg_type = 0;
  29        u32 bus_no, reg;
  30
  31        if (hose->indirect_type & INDIRECT_TYPE_NO_PCIE_LINK) {
  32                if (bus->number != hose->first_busno)
  33                        return PCIBIOS_DEVICE_NOT_FOUND;
  34                if (devfn != 0)
  35                        return PCIBIOS_DEVICE_NOT_FOUND;
  36        }
  37
  38        if (hose->indirect_type & INDIRECT_TYPE_SET_CFG_TYPE)
  39                if (bus->number != hose->first_busno)
  40                        cfg_type = 1;
  41
  42        bus_no = (bus->number == hose->first_busno) ?
  43                        hose->self_busno : bus->number;
  44
  45        if (hose->indirect_type & INDIRECT_TYPE_EXT_REG)
  46                reg = ((offset & 0xf00) << 16) | (offset & 0xfc);
  47        else
  48                reg = offset & 0xfc; /* Only 3 bits for function */
  49
  50        if (hose->indirect_type & INDIRECT_TYPE_BIG_ENDIAN)
  51                out_be32(hose->cfg_addr, (0x80000000 | (bus_no << 16) |
  52                         (devfn << 8) | reg | cfg_type));
  53        else
  54                out_le32(hose->cfg_addr, (0x80000000 | (bus_no << 16) |
  55                         (devfn << 8) | reg | cfg_type));
  56
  57        /*
  58         * Note: the caller has already checked that offset is
  59         * suitably aligned and that len is 1, 2 or 4.
  60         */
  61        cfg_data = hose->cfg_data + (offset & 3); /* Only 3 bits for function */
  62        switch (len) {
  63        case 1:
  64                *val = in_8(cfg_data);
  65                break;
  66        case 2:
  67                *val = in_le16(cfg_data);
  68                break;
  69        default:
  70                *val = in_le32(cfg_data);
  71                break;
  72        }
  73        return PCIBIOS_SUCCESSFUL;
  74}
  75
  76static int
  77indirect_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
  78                      int len, u32 val)
  79{
  80        struct pci_controller *hose = pci_bus_to_host(bus);
  81        volatile void __iomem *cfg_data;
  82        u8 cfg_type = 0;
  83        u32 bus_no, reg;
  84
  85        if (hose->indirect_type & INDIRECT_TYPE_NO_PCIE_LINK) {
  86                if (bus->number != hose->first_busno)
  87                        return PCIBIOS_DEVICE_NOT_FOUND;
  88                if (devfn != 0)
  89                        return PCIBIOS_DEVICE_NOT_FOUND;
  90        }
  91
  92        if (hose->indirect_type & INDIRECT_TYPE_SET_CFG_TYPE)
  93                if (bus->number != hose->first_busno)
  94                        cfg_type = 1;
  95
  96        bus_no = (bus->number == hose->first_busno) ?
  97                        hose->self_busno : bus->number;
  98
  99        if (hose->indirect_type & INDIRECT_TYPE_EXT_REG)
 100                reg = ((offset & 0xf00) << 16) | (offset & 0xfc);
 101        else
 102                reg = offset & 0xfc;
 103
 104        if (hose->indirect_type & INDIRECT_TYPE_BIG_ENDIAN)
 105                out_be32(hose->cfg_addr, (0x80000000 | (bus_no << 16) |
 106                         (devfn << 8) | reg | cfg_type));
 107        else
 108                out_le32(hose->cfg_addr, (0x80000000 | (bus_no << 16) |
 109                         (devfn << 8) | reg | cfg_type));
 110
 111        /* suppress setting of PCI_PRIMARY_BUS */
 112        if (hose->indirect_type & INDIRECT_TYPE_SURPRESS_PRIMARY_BUS)
 113                if ((offset == PCI_PRIMARY_BUS) &&
 114                        (bus->number == hose->first_busno))
 115                        val &= 0xffffff00;
 116
 117        /* Workaround for PCI_28 Errata in 440EPx/GRx */
 118        if ((hose->indirect_type & INDIRECT_TYPE_BROKEN_MRM) &&
 119                        offset == PCI_CACHE_LINE_SIZE) {
 120                val = 0;
 121        }
 122
 123        /*
 124         * Note: the caller has already checked that offset is
 125         * suitably aligned and that len is 1, 2 or 4.
 126         */
 127        cfg_data = hose->cfg_data + (offset & 3);
 128        switch (len) {
 129        case 1:
 130                out_8(cfg_data, val);
 131                break;
 132        case 2:
 133                out_le16(cfg_data, val);
 134                break;
 135        default:
 136                out_le32(cfg_data, val);
 137                break;
 138        }
 139
 140        return PCIBIOS_SUCCESSFUL;
 141}
 142
 143static struct pci_ops indirect_pci_ops = {
 144        .read = indirect_read_config,
 145        .write = indirect_write_config,
 146};
 147
 148void __init
 149setup_indirect_pci(struct pci_controller *hose,
 150                   resource_size_t cfg_addr,
 151                   resource_size_t cfg_data, u32 flags)
 152{
 153        resource_size_t base = cfg_addr & PAGE_MASK;
 154        void __iomem *mbase;
 155
 156        mbase = ioremap(base, PAGE_SIZE);
 157        hose->cfg_addr = mbase + (cfg_addr & ~PAGE_MASK);
 158        if ((cfg_data & PAGE_MASK) != base)
 159                mbase = ioremap(cfg_data & PAGE_MASK, PAGE_SIZE);
 160        hose->cfg_data = mbase + (cfg_data & ~PAGE_MASK);
 161        hose->ops = &indirect_pci_ops;
 162        hose->indirect_type = flags;
 163}
 164