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_IXP425
  25 extern unsigned char    in_8 (volatile unsigned *addr);
  26 extern unsigned short   in_le16 (volatile unsigned *addr);
  27 extern unsigned         in_le32 (volatile unsigned *addr);
  28 extern void             out_8 (volatile unsigned *addr, char val);
  29 extern void             out_le16 (volatile unsigned *addr, unsigned short val);
  30 extern void             out_le32 (volatile unsigned *addr, unsigned int val);
  31 #endif  /* CONFIG_IXP425 */
  32
  33 #if defined(CONFIG_MPC8260)
  34 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  35 static int                                                               \
  36 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  37                               pci_dev_t dev, int offset, type val)       \
  38 {                                                                        \
  39         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  40         sync();                                                          \
  41         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  42         return 0;                                                        \
  43 }
  44 #elif defined(CONFIG_E500)
  45 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  46 static int                                                               \
  47 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  48                               pci_dev_t dev, int offset, type val)       \
  49 {                                                                        \
  50         *(hose->cfg_addr) = dev | (offset & 0xfc) | 0x80000000;          \
  51         sync();                                                          \
  52         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  53         return 0;                                                        \
  54 }
  55 #elif defined(CONFIG_440GX) || defined(CONFIG_440EP) || defined(CONFIG_440GR)
  56 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  57 static int                                                               \
  58 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  59                               pci_dev_t dev, int offset, type val)       \
  60 {                                                                        \
  61         if (PCI_BUS(dev) > 0)                                            \
  62                 out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000001); \
  63         else                                                             \
  64                 out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000); \
  65         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  66         return 0;                                                        \
  67 }
  68 #else
  69 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  70 static int                                                               \
  71 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  72                               pci_dev_t dev, int offset, type val)       \
  73 {                                                                        \
  74         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  75         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  76         return 0;                                                        \
  77 }
  78 #endif
  79
  80 #define INDIRECT_PCI_OP_ERRATA6(rw, size, type, op, mask)                \
  81 static int                                                               \
  82 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  83                               pci_dev_t dev, int offset, type val)       \
  84 {                                                                        \
  85         unsigned int msr = mfmsr();                                      \
  86         mtmsr(msr & ~(MSR_EE | MSR_CE));                                 \
  87         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  88         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  89         out_le32(hose->cfg_addr, 0x00000000);                            \
  90         mtmsr(msr);                                                      \
  91         return 0;                                                        \
  92 }
  93
  94 INDIRECT_PCI_OP(read, byte, u8 *, in_8, 3)
  95 INDIRECT_PCI_OP(read, word, u16 *, in_le16, 2)
  96 INDIRECT_PCI_OP(read, dword, u32 *, in_le32, 0)
  97 #ifdef CONFIG_405GP
  98 INDIRECT_PCI_OP_ERRATA6(write, byte, u8, out_8, 3)
  99 INDIRECT_PCI_OP_ERRATA6(write, word, u16, out_le16, 2)
 100 INDIRECT_PCI_OP_ERRATA6(write, dword, u32, out_le32, 0)
 101 #else
 102 INDIRECT_PCI_OP(write, byte, u8, out_8, 3)
 103 INDIRECT_PCI_OP(write, word, u16, out_le16, 2)
 104 INDIRECT_PCI_OP(write, dword, u32, out_le32, 0)
 105 #endif
 106
 107 void pci_setup_indirect(struct pci_controller* hose, u32 cfg_addr, u32 cfg_data)
 108 {
 109         pci_set_ops(hose,
 110                     indirect_read_config_byte,
 111                     indirect_read_config_word,
 112                     indirect_read_config_dword,
 113                     indirect_write_config_byte,
 114                     indirect_write_config_word,
 115                     indirect_write_config_dword);
 116
 117         hose->cfg_addr = (unsigned int *) cfg_addr;
 118         hose->cfg_data = (unsigned char *) cfg_data;
 119 }
 120
 121 #endif
 122 #endif