drivers/pci/pci_indirect.c

   1 /*
   2  * Support for indirect PCI bridges.
   3  *
   4  * Copyright (C) 1998 Gabriel Paubert.
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10
  11 #if !defined(__I386__)
  12
  13 #include <asm/processor.h>
  14 #include <asm/io.h>
  15 #include <pci.h>
  16
  17 #define cfg_read(val, addr, type, op)   *val = op((type)(addr))
  18 #define cfg_write(val, addr, type, op)  op((type *)(addr), (val))
  19
  20 #if defined(CONFIG_E500) || defined(CONFIG_MPC86xx)
  21 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  22 static int                                                               \
  23 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  24                               pci_dev_t dev, int offset, type val)       \
  25 {                                                                        \
  26         u32 b, d,f;                                                      \
  27         b = PCI_BUS(dev); d = PCI_DEV(dev); f = PCI_FUNC(dev);           \
  28         b = b - hose->first_busno;                                       \
  29         dev = PCI_BDF(b, d, f);                                          \
  30         *(hose->cfg_addr) = dev | (offset & 0xfc) | ((offset & 0xf00) << 16) | 0x80000000; \
  31         sync();                                                          \
  32         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  33         return 0;                                                        \
  34 }
  35 #elif defined(CONFIG_440GX)  || defined(CONFIG_440GP) || defined(CONFIG_440SP) || \
  36       defined(CONFIG_440SPE) || defined(CONFIG_460EX) || defined(CONFIG_460GT)
  37 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  38 static int                                                               \
  39 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  40                               pci_dev_t dev, int offset, type val)       \
  41 {                                                                        \
  42         u32 b, d,f;                                                      \
  43         b = PCI_BUS(dev); d = PCI_DEV(dev); f = PCI_FUNC(dev);           \
  44         b = b - hose->first_busno;                                       \
  45         dev = PCI_BDF(b, d, f);                                          \
  46         if (PCI_BUS(dev) > 0)                                            \
  47                 out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000001); \
  48         else                                                             \
  49                 out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000); \
  50         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  51         return 0;                                                        \
  52 }
  53 #else
  54 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  55 static int                                                               \
  56 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  57                               pci_dev_t dev, int offset, type val)       \
  58 {                                                                        \
  59         u32 b, d,f;                                                      \
  60         b = PCI_BUS(dev); d = PCI_DEV(dev); f = PCI_FUNC(dev);           \
  61         b = b - hose->first_busno;                                       \
  62         dev = PCI_BDF(b, d, f);                                          \
  63         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  64         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  65         return 0;                                                        \
  66 }
  67 #endif
  68
  69 #define INDIRECT_PCI_OP_ERRATA6(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         unsigned int msr = mfmsr();                                      \
  75         mtmsr(msr & ~(MSR_EE | MSR_CE));                                 \
  76         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  77         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  78         out_le32(hose->cfg_addr, 0x00000000);                            \
  79         mtmsr(msr);                                                      \
  80         return 0;                                                        \
  81 }
  82
  83 INDIRECT_PCI_OP(read, byte, u8 *, in_8, 3)
  84 INDIRECT_PCI_OP(read, word, u16 *, in_le16, 2)
  85 INDIRECT_PCI_OP(read, dword, u32 *, in_le32, 0)
  86 #ifdef CONFIG_405GP
  87 INDIRECT_PCI_OP_ERRATA6(write, byte, u8, out_8, 3)
  88 INDIRECT_PCI_OP_ERRATA6(write, word, u16, out_le16, 2)
  89 INDIRECT_PCI_OP_ERRATA6(write, dword, u32, out_le32, 0)
  90 #else
  91 INDIRECT_PCI_OP(write, byte, u8, out_8, 3)
  92 INDIRECT_PCI_OP(write, word, u16, out_le16, 2)
  93 INDIRECT_PCI_OP(write, dword, u32, out_le32, 0)
  94 #endif
  95
  96 void pci_setup_indirect(struct pci_controller* hose, u32 cfg_addr, u32 cfg_data)
  97 {
  98         pci_set_ops(hose,
  99                     indirect_read_config_byte,
 100                     indirect_read_config_word,
 101                     indirect_read_config_dword,
 102                     indirect_write_config_byte,
 103                     indirect_write_config_word,
 104                     indirect_write_config_dword);
 105
 106         hose->cfg_addr = (unsigned int *) cfg_addr;
 107         hose->cfg_data = (unsigned char *) cfg_data;
 108 }
 109
 110 #endif  /* !__I386__ */