drivers/core/simple-bus.c

   1 /*
   2  * Copyright (c) 2014 Google, Inc
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <dm/root.h>
  10
  11 DECLARE_GLOBAL_DATA_PTR;
  12
  13 struct simple_bus_plat {
  14         u32 base;
  15         u32 size;
  16         u32 target;
  17 };
  18
  19 fdt_addr_t simple_bus_translate(struct udevice *dev, fdt_addr_t addr)
  20 {
  21         struct simple_bus_plat *plat = dev_get_uclass_platdata(dev);
  22
  23         if (addr >= plat->base && addr < plat->base + plat->size)
  24                 addr = (addr - plat->base) + plat->target;
  25
  26         return addr;
  27 }
  28
  29 static int simple_bus_post_bind(struct udevice *dev)
  30 {
  31         u32 cell[3];
  32         int ret;
  33
  34         ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, "ranges",
  35                                    cell, ARRAY_SIZE(cell));
  36         if (!ret) {
  37                 struct simple_bus_plat *plat = dev_get_uclass_platdata(dev);
  38
  39                 plat->base = cell[0];
  40                 plat->target = cell[1];
  41                 plat->size = cell[2];
  42         }
  43
  44         return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
  45 }
  46
  47 UCLASS_DRIVER(simple_bus) = {
  48         .id             = UCLASS_SIMPLE_BUS,
  49         .name           = "simple_bus",
  50         .post_bind      = simple_bus_post_bind,
  51         .per_device_platdata_auto_alloc_size = sizeof(struct simple_bus_plat),
  52 };
  53
  54 static const struct udevice_id generic_simple_bus_ids[] = {
  55         { .compatible = "simple-bus" },
  56         { }
  57 };
  58
  59 U_BOOT_DRIVER(simple_bus_drv) = {
  60         .name   = "generic_simple_bus",
  61         .id     = UCLASS_SIMPLE_BUS,
  62         .of_match = generic_simple_bus_ids,
  63 };