board/freescale/common/cds_pci_ft.c

   1 /*
   2  * Copyright 2004 Freescale Semiconductor.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <libfdt.h>
   9 #include <fdt_support.h>
  10 #include "cadmus.h"
  11
  12 #if defined(CONFIG_OF_BOARD_SETUP)
  13 static void cds_pci_fixup(void *blob)
  14 {
  15         int node;
  16         const char *path;
  17         int len, slot, i;
  18         u32 *map = NULL, *piccells = NULL;
  19         int off, cells;
  20
  21         node = fdt_path_offset(blob, "/aliases");
  22         if (node >= 0) {
  23                 path = fdt_getprop(blob, node, "pci0", NULL);
  24                 if (path) {
  25                         node = fdt_path_offset(blob, path);
  26                         if (node >= 0) {
  27                                 map = fdt_getprop_w(blob, node, "interrupt-map", &len);
  28                         }
  29                         /* Each item in "interrupt-map" property is translated with
  30                          * following cells:
  31                          * PCI #address-cells, PCI #interrupt-cells,
  32                          * PIC address, PIC #address-cells, PIC #interrupt-cells.
  33                          */
  34                         cells = fdt_getprop_u32_default(blob, path, "#address-cells", 1);
  35                         cells += fdt_getprop_u32_default(blob, path, "#interrupt-cells", 1);
  36                         off = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*(map+cells)));
  37                         if (off <= 0)
  38                                 return;
  39                         cells += 1;
  40                         piccells = (u32 *)fdt_getprop(blob, off, "#address-cells", NULL);
  41                         if (piccells == NULL)
  42                                 return;
  43                         cells += *piccells;
  44                         piccells = (u32 *)fdt_getprop(blob, off, "#interrupt-cells", NULL);
  45                         if (piccells == NULL)
  46                                 return;
  47                         cells += *piccells;
  48                 }
  49         }
  50
  51         if (map) {
  52                 len /= sizeof(u32);
  53
  54                 slot = get_pci_slot();
  55
  56                 for (i=0;i<len;i+=cells) {
  57                         /* We rotate the interrupt pins so that the mapping
  58                          * changes depending on the slot the carrier card is in.
  59                          */
  60                         map[3] = ((map[3] + slot - 2) % 4) + 1;
  61                         map+=cells;
  62                 }
  63         }
  64 }
  65
  66 int ft_board_setup(void *blob, bd_t *bd)
  67 {
  68         ft_cpu_setup(blob, bd);
  69 #ifdef CONFIG_PCI
  70         ft_pci_setup(blob, bd);
  71         cds_pci_fixup(blob);
  72 #endif
  73
  74         return 0;
  75 }
  76 #endif