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_MPC8260)
  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         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 #elif defined(CONFIG_E500) || defined(CONFIG_MPC86xx)
  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         u32 b, d,f;                                                      \
  42         b = PCI_BUS(dev); d = PCI_DEV(dev); f = PCI_FUNC(dev);           \
  43         b = b - hose->first_busno;                                       \
  44         dev = PCI_BDF(b, d, f);                                          \
  45         *(hose->cfg_addr) = dev | (offset & 0xfc) | ((offset & 0xf00) << 16) | 0x80000000; \
  46         sync();                                                          \
  47         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  48         return 0;                                                        \
  49 }
  50 #elif defined(CONFIG_440GX)  || defined(CONFIG_440GP) || defined(CONFIG_440SP) || \
  51       defined(CONFIG_440SPE) || defined(CONFIG_460EX) || defined(CONFIG_460GT)
  52 #define INDIRECT_PCI_OP(rw, size, type, op, mask)                        \
  53 static int                                                               \
  54 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  55                               pci_dev_t dev, int offset, type val)       \
  56 {                                                                        \
  57         u32 b, d,f;                                                      \
  58         b = PCI_BUS(dev); d = PCI_DEV(dev); f = PCI_FUNC(dev);           \
  59         b = b - hose->first_busno;                                       \
  60         dev = PCI_BDF(b, d, f);                                          \
  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         u32 b, d,f;                                                      \
  75         b = PCI_BUS(dev); d = PCI_DEV(dev); f = PCI_FUNC(dev);           \
  76         b = b - hose->first_busno;                                       \
  77         dev = PCI_BDF(b, d, f);                                          \
  78         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  79         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  80         return 0;                                                        \
  81 }
  82 #endif
  83
  84 #define INDIRECT_PCI_OP_ERRATA6(rw, size, type, op, mask)                \
  85 static int                                                               \
  86 indirect_##rw##_config_##size(struct pci_controller *hose,               \
  87                               pci_dev_t dev, int offset, type val)       \
  88 {                                                                        \
  89         unsigned int msr = mfmsr();                                      \
  90         mtmsr(msr & ~(MSR_EE | MSR_CE));                                 \
  91         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  92         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  93         out_le32(hose->cfg_addr, 0x00000000);                            \
  94         mtmsr(msr);                                                      \
  95         return 0;                                                        \
  96 }
  97
  98 INDIRECT_PCI_OP(read, byte, u8 *, in_8, 3)
  99 INDIRECT_PCI_OP(read, word, u16 *, in_le16, 2)
 100 INDIRECT_PCI_OP(read, dword, u32 *, in_le32, 0)
 101 #ifdef CONFIG_405GP
 102 INDIRECT_PCI_OP_ERRATA6(write, byte, u8, out_8, 3)
 103 INDIRECT_PCI_OP_ERRATA6(write, word, u16, out_le16, 2)
 104 INDIRECT_PCI_OP_ERRATA6(write, dword, u32, out_le32, 0)
 105 #else
 106 INDIRECT_PCI_OP(write, byte, u8, out_8, 3)
 107 INDIRECT_PCI_OP(write, word, u16, out_le16, 2)
 108 INDIRECT_PCI_OP(write, dword, u32, out_le32, 0)
 109 #endif
 110
 111 void pci_setup_indirect(struct pci_controller* hose, u32 cfg_addr, u32 cfg_data)
 112 {
 113         pci_set_ops(hose,
 114                     indirect_read_config_byte,
 115                     indirect_read_config_word,
 116                     indirect_read_config_dword,
 117                     indirect_write_config_byte,
 118                     indirect_write_config_word,
 119                     indirect_write_config_dword);
 120
 121         hose->cfg_addr = (unsigned int *) cfg_addr;
 122         hose->cfg_data = (unsigned char *) cfg_data;
 123 }
 124
 125 #endif  /* !__I386__ */