arch/ppc/syslib/indirect_pci.c

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