arch/powerpc/sysdev/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
  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
  29 static int
  30 indirect_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
  68 static int
  69 indirect_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
 107 static struct pci_ops indirect_pci_ops =
 108 {
 109         indirect_read_config,
 110         indirect_write_config
 111 };
 112
 113 void __init
 114 setup_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
 122 void __init
 123 setup_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 }