drivers/pci_indirect.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 <common.h>
  13
  14 #ifdef CONFIG_PCI
  15 #ifndef __I386__
  16
  17 #include <asm/processor.h>
  18 #include <asm/io.h>
  19 #include <pci.h>
  20
  21 #define cfg_read(val, addr, type, op)   *val = op((type)(addr))
  22 #define cfg_write(val, addr, type, op)  op((type *)(addr), (val))
  23
  24 #ifdef CONFIG_PM826
  25 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  26 static int                                                               \
  27 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  28                               pci_dev_t dev, int offset, type val)       \
  29 {                                                                        \
  30         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  31         sync();                                                          \
  32         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  33         return 0;                                                        \
  34 }
  35 #else
  36 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  37 static int                                                               \
  38 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  39                               pci_dev_t dev, int offset, type val)       \
  40 {                                                                        \
  41         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  42         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  43         return 0;                                                        \
  44 }
  45 #endif
  46
  47 #define INDIRECT_PCI_OP_ERRATA6(rw, size, type, op, mask)                \
  48 static int                                                               \
  49 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  50                               pci_dev_t dev, int offset, type val)       \
  51 {                                                                        \
  52         unsigned int msr = mfmsr();                                      \
  53         mtmsr(msr & ~(MSR_EE | MSR_CE));                                 \
  54         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  55         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  56         out_le32(hose->cfg_addr, 0x00000000);                            \
  57         mtmsr(msr);                                                      \
  58         return 0;                                                        \
  59 }
  60
  61 INDIRECT_PCI_OP(read, byte, u8 *, in_8, 3)
  62 INDIRECT_PCI_OP(read, word, u16 *, in_le16, 2)
  63 INDIRECT_PCI_OP(read, dword, u32 *, in_le32, 0)
  64 #ifdef CONFIG_405GP
  65 INDIRECT_PCI_OP_ERRATA6(write, byte, u8, out_8, 3)
  66 INDIRECT_PCI_OP_ERRATA6(write, word, u16, out_le16, 2)
  67 INDIRECT_PCI_OP_ERRATA6(write, dword, u32, out_le32, 0)
  68 #else
  69 INDIRECT_PCI_OP(write, byte, u8, out_8, 3)
  70 INDIRECT_PCI_OP(write, word, u16, out_le16, 2)
  71 INDIRECT_PCI_OP(write, dword, u32, out_le32, 0)
  72 #endif
  73
  74 void pci_setup_indirect(struct pci_controller* hose, u32 cfg_addr, u32 cfg_data)
  75 {
  76         pci_set_ops(hose,
  77                     indirect_read_config_byte,
  78                     indirect_read_config_word,
  79                     indirect_read_config_dword,
  80                     indirect_write_config_byte,
  81                     indirect_write_config_word,
  82                     indirect_write_config_dword);
  83
  84         hose->cfg_addr = (unsigned int *) cfg_addr;
  85         hose->cfg_data = (unsigned char *) cfg_data;
  86 }
  87
  88 #endif
  89 #endif