drivers/core/fdtaddr.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Device addresses
   4  *
   5  * Copyright (c) 2017 Google, Inc
   6  *
   7  * (C) Copyright 2012
   8  * Pavel Herrmann <morpheus.ibis@gmail.com>
   9  */
  10
  11 #include <common.h>
  12 #include <dm.h>
  13 #include <fdt_support.h>
  14 #include <asm/io.h>
  15 #include <dm/device-internal.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 fdt_addr_t devfdt_get_addr_index(struct udevice *dev, int index)
  20 {
  21 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
  22         fdt_addr_t addr;
  23
  24         if (CONFIG_IS_ENABLED(OF_TRANSLATE)) {
  25                 const fdt32_t *reg;
  26                 int len = 0;
  27                 int na, ns;
  28
  29                 na = fdt_address_cells(gd->fdt_blob,
  30                                        dev_of_offset(dev->parent));
  31                 if (na < 1) {
  32                         debug("bad #address-cells\n");
  33                         return FDT_ADDR_T_NONE;
  34                 }
  35
  36                 ns = fdt_size_cells(gd->fdt_blob, dev_of_offset(dev->parent));
  37                 if (ns < 0) {
  38                         debug("bad #size-cells\n");
  39                         return FDT_ADDR_T_NONE;
  40                 }
  41
  42                 reg = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "reg",
  43                                   &len);
  44                 if (!reg || (len <= (index * sizeof(fdt32_t) * (na + ns)))) {
  45                         debug("Req index out of range\n");
  46                         return FDT_ADDR_T_NONE;
  47                 }
  48
  49                 reg += index * (na + ns);
  50
  51                 if (ns) {
  52                         /*
  53                          * Use the full-fledged translate function for complex
  54                          * bus setups.
  55                          */
  56                         addr = fdt_translate_address((void *)gd->fdt_blob,
  57                                                      dev_of_offset(dev), reg);
  58                 } else {
  59                         /* Non translatable if #size-cells == 0 */
  60                         addr = fdt_read_number(reg, na);
  61                 }
  62         } else {
  63                 /*
  64                  * Use the "simple" translate function for less complex
  65                  * bus setups.
  66                  */
  67                 addr = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
  68                                 dev_of_offset(dev->parent), dev_of_offset(dev),
  69                                 "reg", index, NULL, false);
  70                 if (CONFIG_IS_ENABLED(SIMPLE_BUS) && addr != FDT_ADDR_T_NONE) {
  71                         if (device_get_uclass_id(dev->parent) ==
  72                             UCLASS_SIMPLE_BUS)
  73                                 addr = simple_bus_translate(dev->parent, addr);
  74                 }
  75         }
  76
  77         /*
  78          * Some platforms need a special address translation. Those
  79          * platforms (e.g. mvebu in SPL) can configure a translation
  80          * offset in the DM by calling dm_set_translation_offset() that
  81          * will get added to all addresses returned by devfdt_get_addr().
  82          */
  83         addr += dm_get_translation_offset();
  84
  85         return addr;
  86 #else
  87         return FDT_ADDR_T_NONE;
  88 #endif
  89 }
  90
  91 fdt_addr_t devfdt_get_addr_size_index(struct udevice *dev, int index,
  92                                    fdt_size_t *size)
  93 {
  94 #if CONFIG_IS_ENABLED(OF_CONTROL)
  95         /*
  96          * Only get the size in this first call. We'll get the addr in the
  97          * next call to the exisiting dev_get_xxx function which handles
  98          * all config options.
  99          */
 100         fdtdec_get_addr_size_auto_noparent(gd->fdt_blob, dev_of_offset(dev),
 101                                            "reg", index, size, false);
 102
 103         /*
 104          * Get the base address via the existing function which handles
 105          * all Kconfig cases
 106          */
 107         return devfdt_get_addr_index(dev, index);
 108 #else
 109         return FDT_ADDR_T_NONE;
 110 #endif
 111 }
 112
 113 fdt_addr_t devfdt_get_addr_name(struct udevice *dev, const char *name)
 114 {
 115 #if CONFIG_IS_ENABLED(OF_CONTROL)
 116         int index;
 117
 118         index = fdt_stringlist_search(gd->fdt_blob, dev_of_offset(dev),
 119                                       "reg-names", name);
 120         if (index < 0)
 121                 return index;
 122
 123         return devfdt_get_addr_index(dev, index);
 124 #else
 125         return FDT_ADDR_T_NONE;
 126 #endif
 127 }
 128
 129 fdt_addr_t devfdt_get_addr(struct udevice *dev)
 130 {
 131         return devfdt_get_addr_index(dev, 0);
 132 }
 133
 134 void *devfdt_get_addr_ptr(struct udevice *dev)
 135 {
 136         return (void *)(uintptr_t)devfdt_get_addr_index(dev, 0);
 137 }
 138
 139 void *devfdt_map_physmem(struct udevice *dev, unsigned long size)
 140 {
 141         fdt_addr_t addr = devfdt_get_addr(dev);
 142
 143         if (addr == FDT_ADDR_T_NONE)
 144                 return NULL;
 145
 146         return map_physmem(addr, size, MAP_NOCACHE);
 147 }