drivers/pci/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 #if (!defined(__I386__) && !defined(CONFIG_IXDP425))
  15
  16 #include <asm/processor.h>
  17 #include <asm/io.h>
  18 #include <pci.h>
  19
  20 #define cfg_read(val, addr, type, op)   *val = op((type)(addr))
  21 #define cfg_write(val, addr, type, op)  op((type *)(addr), (val))
  22
  23 #ifdef CONFIG_IXP425
  24 extern unsigned char    in_8 (volatile unsigned *addr);
  25 extern unsigned short   in_le16 (volatile unsigned *addr);
  26 extern unsigned         in_le32 (volatile unsigned *addr);
  27 extern void             out_8 (volatile unsigned *addr, char val);
  28 extern void             out_le16 (volatile unsigned *addr, unsigned short val);
  29 extern void             out_le32 (volatile unsigned *addr, unsigned int val);
  30 #endif  /* CONFIG_IXP425 */
  31
  32 #if defined(CONFIG_MPC8260)
  33 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  34 static int                                                               \
  35 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  36                               pci_dev_t dev, int offset, type val)       \
  37 {                                                                        \
  38         u32 b, d,f;                                                      \
  39         b = PCI_BUS(dev); d = PCI_DEV(dev); f = PCI_FUNC(dev);           \
  40         b = b - hose->first_busno;                                       \
  41         dev = PCI_BDF(b, d, f);                                          \
  42         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  43         sync();                                                          \
  44         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  45         return 0;                                                        \
  46 }
  47 #elif defined(CONFIG_E500) || defined(CONFIG_MPC86xx)
  48 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  49 static int                                                               \
  50 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  51                               pci_dev_t dev, int offset, type val)       \
  52 {                                                                        \
  53         u32 b, d,f;                                                      \
  54         b = PCI_BUS(dev); d = PCI_DEV(dev); f = PCI_FUNC(dev);           \
  55         b = b - hose->first_busno;                                       \
  56         dev = PCI_BDF(b, d, f);                                          \
  57         *(hose->cfg_addr) = dev | (offset & 0xfc) | ((offset & 0xf00) << 16) | 0x80000000; \
  58         sync();                                                          \
  59         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  60         return 0;                                                        \
  61 }
  62 #elif defined(CONFIG_440GX) || defined(CONFIG_440EP) || defined(CONFIG_440GR) || defined(CONFIG_440SPE)
  63 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  64 static int                                                               \
  65 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  66                               pci_dev_t dev, int offset, type val)       \
  67 {                                                                        \
  68         u32 b, d,f;                                                      \
  69         b = PCI_BUS(dev); d = PCI_DEV(dev); f = PCI_FUNC(dev);           \
  70         b = b - hose->first_busno;                                       \
  71         dev = PCI_BDF(b, d, f);                                          \
  72         if (PCI_BUS(dev) > 0)                                            \
  73                 out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000001); \
  74         else                                                             \
  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 #else
  80 #define INDIRECT_PCI_OP(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         u32 b, d,f;                                                      \
  86         b = PCI_BUS(dev); d = PCI_DEV(dev); f = PCI_FUNC(dev);           \
  87         b = b - hose->first_busno;                                       \
  88         dev = PCI_BDF(b, d, f);                                          \
  89         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  90         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  91         return 0;                                                        \
  92 }
  93 #endif
  94
  95 #define INDIRECT_PCI_OP_ERRATA6(rw, size, type, op, mask)                \
  96 static int                                                               \
  97 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  98                               pci_dev_t dev, int offset, type val)       \
  99 {                                                                        \
 100         unsigned int msr = mfmsr();                                      \
 101         mtmsr(msr & ~(MSR_EE | MSR_CE));                                 \
 102         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
 103         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
 104         out_le32(hose->cfg_addr, 0x00000000);                            \
 105         mtmsr(msr);                                                      \
 106         return 0;                                                        \
 107 }
 108
 109 INDIRECT_PCI_OP(read, byte, u8 *, in_8, 3)
 110 INDIRECT_PCI_OP(read, word, u16 *, in_le16, 2)
 111 INDIRECT_PCI_OP(read, dword, u32 *, in_le32, 0)
 112 #ifdef CONFIG_405GP
 113 INDIRECT_PCI_OP_ERRATA6(write, byte, u8, out_8, 3)
 114 INDIRECT_PCI_OP_ERRATA6(write, word, u16, out_le16, 2)
 115 INDIRECT_PCI_OP_ERRATA6(write, dword, u32, out_le32, 0)
 116 #else
 117 INDIRECT_PCI_OP(write, byte, u8, out_8, 3)
 118 INDIRECT_PCI_OP(write, word, u16, out_le16, 2)
 119 INDIRECT_PCI_OP(write, dword, u32, out_le32, 0)
 120 #endif
 121
 122 void pci_setup_indirect(struct pci_controller* hose, u32 cfg_addr, u32 cfg_data)
 123 {
 124         pci_set_ops(hose,
 125                     indirect_read_config_byte,
 126                     indirect_read_config_word,
 127                     indirect_read_config_dword,
 128                     indirect_write_config_byte,
 129                     indirect_write_config_word,
 130                     indirect_write_config_dword);
 131
 132         hose->cfg_addr = (unsigned int *) cfg_addr;
 133         hose->cfg_data = (unsigned char *) cfg_data;
 134 }
 135
 136 #endif  /* !__I386__ && !CONFIG_IXDP425 */