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 #ifndef __ARM__
  17
  18 #include <asm/processor.h>
  19 #include <asm/io.h>
  20 #include <pci.h>
  21
  22 #define cfg_read(val, addr, type, op)   *val = op((type)(addr))
  23 #define cfg_write(val, addr, type, op)  op((type *)(addr), (val))
  24
  25 #ifdef CONFIG_IXP425
  26 extern unsigned char    in_8 (volatile unsigned *addr);
  27 extern unsigned short   in_le16 (volatile unsigned *addr);
  28 extern unsigned         in_le32 (volatile unsigned *addr);
  29 extern void             out_8 (volatile unsigned *addr, char val);
  30 extern void             out_le16 (volatile unsigned *addr, unsigned short val);
  31 extern void             out_le32 (volatile unsigned *addr, unsigned int val);
  32 #endif  /* CONFIG_IXP425 */
  33
  34 #if defined(CONFIG_MPC8260)
  35 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  36 static int                                                               \
  37 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  38                               pci_dev_t dev, int offset, type val)       \
  39 {                                                                        \
  40         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  41         sync();                                                          \
  42         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  43         return 0;                                                        \
  44 }
  45 #elif defined(CONFIG_E500)
  46 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  47 static int                                                               \
  48 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  49                               pci_dev_t dev, int offset, type val)       \
  50 {                                                                        \
  51         *(hose->cfg_addr) = dev | (offset & 0xfc) | 0x80000000;          \
  52         sync();                                                          \
  53         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  54         return 0;                                                        \
  55 }
  56 #elif defined(CONFIG_440GX) || defined(CONFIG_440EP) || defined(CONFIG_440GR)
  57 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  58 static int                                                               \
  59 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  60                               pci_dev_t dev, int offset, type val)       \
  61 {                                                                        \
  62         if (PCI_BUS(dev) > 0)                                            \
  63                 out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000001); \
  64         else                                                             \
  65                 out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000); \
  66         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  67         return 0;                                                        \
  68 }
  69 #else
  70 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  71 static int                                                               \
  72 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  73                               pci_dev_t dev, int offset, type val)       \
  74 {                                                                        \
  75         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  76         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  77         return 0;                                                        \
  78 }
  79 #endif
  80
  81 #define INDIRECT_PCI_OP_ERRATA6(rw, size, type, op, mask)                \
  82 static int                                                               \
  83 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  84                               pci_dev_t dev, int offset, type val)       \
  85 {                                                                        \
  86         unsigned int msr = mfmsr();                                      \
  87         mtmsr(msr & ~(MSR_EE | MSR_CE));                                 \
  88         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  89         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  90         out_le32(hose->cfg_addr, 0x00000000);                            \
  91         mtmsr(msr);                                                      \
  92         return 0;                                                        \
  93 }
  94
  95 INDIRECT_PCI_OP(read, byte, u8 *, in_8, 3)
  96 INDIRECT_PCI_OP(read, word, u16 *, in_le16, 2)
  97 INDIRECT_PCI_OP(read, dword, u32 *, in_le32, 0)
  98 #ifdef CONFIG_405GP
  99 INDIRECT_PCI_OP_ERRATA6(write, byte, u8, out_8, 3)
 100 INDIRECT_PCI_OP_ERRATA6(write, word, u16, out_le16, 2)
 101 INDIRECT_PCI_OP_ERRATA6(write, dword, u32, out_le32, 0)
 102 #else
 103 INDIRECT_PCI_OP(write, byte, u8, out_8, 3)
 104 INDIRECT_PCI_OP(write, word, u16, out_le16, 2)
 105 INDIRECT_PCI_OP(write, dword, u32, out_le32, 0)
 106 #endif
 107
 108 void pci_setup_indirect(struct pci_controller* hose, u32 cfg_addr, u32 cfg_data)
 109 {
 110         pci_set_ops(hose,
 111                     indirect_read_config_byte,
 112                     indirect_read_config_word,
 113                     indirect_read_config_dword,
 114                     indirect_write_config_byte,
 115                     indirect_write_config_word,
 116                     indirect_write_config_dword);
 117
 118         hose->cfg_addr = (unsigned int *) cfg_addr;
 119         hose->cfg_data = (unsigned char *) cfg_data;
 120 }
 121
 122 #endif  /* __ARM__ */
 123 #endif  /* !__I386__ && !CONFIG_IXDP425 */
 124 #endif  /* CONFIG_PCI */