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 #else
  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         out_le32(hose->cfg_addr, dev | (offset & 0xfc) | 0x80000000);    \
  46         cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);       \
  47         return 0;                                                        \
  48 }
  49 #endif
  50
  51 INDIRECT_PCI_OP(read, byte, u8 *, in_8, 3)
  52 INDIRECT_PCI_OP(read, word, u16 *, in_le16, 2)
  53 INDIRECT_PCI_OP(read, dword, u32 *, in_le32, 0)
  54 INDIRECT_PCI_OP(write, byte, u8, out_8, 3)
  55 INDIRECT_PCI_OP(write, word, u16, out_le16, 2)
  56 INDIRECT_PCI_OP(write, dword, u32, out_le32, 0)
  57
  58 void pci_setup_indirect(struct pci_controller* hose, u32 cfg_addr, u32 cfg_data)
  59 {
  60         pci_set_ops(hose,
  61                     indirect_read_config_byte,
  62                     indirect_read_config_word,
  63                     indirect_read_config_dword,
  64                     indirect_write_config_byte,
  65                     indirect_write_config_word,
  66                     indirect_write_config_dword);
  67
  68         hose->cfg_addr = (unsigned int *) cfg_addr;
  69         hose->cfg_data = (unsigned char *) cfg_data;
  70 }
  71
  72 #endif  /* !__I386__ */