arch/powerpc/cpu/mpc83xx/pci.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) Freescale Semiconductor, Inc. 2007
   4  *
   5  * Author: Scott Wood <scottwood@freescale.com>,
   6  * with some bits from older board-specific PCI initialization.
   7  */
   8
   9 #include <common.h>
  10 #include <init.h>
  11 #include <pci.h>
  12 #include <asm/bitops.h>
  13 #include <asm/global_data.h>
  14 #include <linux/delay.h>
  15
  16 #if defined(CONFIG_OF_LIBFDT)
  17 #include <linux/libfdt.h>
  18 #include <fdt_support.h>
  19 #endif
  20
  21 #include <asm/mpc8349_pci.h>
  22
  23 #define MAX_BUSES 2
  24
  25 DECLARE_GLOBAL_DATA_PTR;
  26
  27 static struct pci_controller pci_hose[MAX_BUSES];
  28 static int pci_num_buses;
  29
  30 #if defined(CONFIG_OF_LIBFDT)
  31 void ft_pci_setup(void *blob, struct bd_info *bd)
  32 {
  33         int nodeoffset;
  34         int tmp[2];
  35         const char *path;
  36
  37         if (pci_num_buses < 1)
  38                 return;
  39
  40         nodeoffset = fdt_path_offset(blob, "/aliases");
  41         if (nodeoffset >= 0) {
  42                 path = fdt_getprop(blob, nodeoffset, "pci0", NULL);
  43                 if (path) {
  44                         tmp[0] = cpu_to_be32(pci_hose[0].first_busno);
  45                         tmp[1] = cpu_to_be32(pci_hose[0].last_busno);
  46                         do_fixup_by_path(blob, path, "bus-range",
  47                                 &tmp, sizeof(tmp), 1);
  48
  49                         tmp[0] = cpu_to_be32(gd->pci_clk);
  50                         do_fixup_by_path(blob, path, "clock-frequency",
  51                                 &tmp, sizeof(tmp[0]), 1);
  52                 }
  53
  54                 if (pci_num_buses < 2)
  55                         return;
  56
  57                 path = fdt_getprop(blob, nodeoffset, "pci1", NULL);
  58                 if (path) {
  59                         tmp[0] = cpu_to_be32(pci_hose[1].first_busno);
  60                         tmp[1] = cpu_to_be32(pci_hose[1].last_busno);
  61                         do_fixup_by_path(blob, path, "bus-range",
  62                                 &tmp, sizeof(tmp), 1);
  63
  64                         tmp[0] = cpu_to_be32(gd->pci_clk);
  65                         do_fixup_by_path(blob, path, "clock-frequency",
  66                                 &tmp, sizeof(tmp[0]), 1);
  67                 }
  68         }
  69 }
  70 #endif /* CONFIG_OF_LIBFDT */