drivers/core/simple-bus.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2014 Google, Inc
   4  */
   5
   6 #include <common.h>
   7 #include <dm.h>
   8
   9 struct simple_bus_plat {
  10         u32 base;
  11         u32 size;
  12         u32 target;
  13 };
  14
  15 fdt_addr_t simple_bus_translate(struct udevice *dev, fdt_addr_t addr)
  16 {
  17         struct simple_bus_plat *plat = dev_get_uclass_platdata(dev);
  18
  19         if (addr >= plat->base && addr < plat->base + plat->size)
  20                 addr = (addr - plat->base) + plat->target;
  21
  22         return addr;
  23 }
  24
  25 static int simple_bus_post_bind(struct udevice *dev)
  26 {
  27 #if CONFIG_IS_ENABLED(OF_PLATDATA)
  28         return 0;
  29 #else
  30         u32 cell[3];
  31         int ret;
  32
  33         ret = dev_read_u32_array(dev, "ranges", cell, ARRAY_SIZE(cell));
  34         if (!ret) {
  35                 struct simple_bus_plat *plat = dev_get_uclass_platdata(dev);
  36
  37                 plat->base = cell[0];
  38                 plat->target = cell[1];
  39                 plat->size = cell[2];
  40         }
  41
  42         return dm_scan_fdt_dev(dev);
  43 #endif
  44 }
  45
  46 UCLASS_DRIVER(simple_bus) = {
  47         .id             = UCLASS_SIMPLE_BUS,
  48         .name           = "simple_bus",
  49         .post_bind      = simple_bus_post_bind,
  50         .per_device_platdata_auto_alloc_size = sizeof(struct simple_bus_plat),
  51 };
  52
  53 static const struct udevice_id generic_simple_bus_ids[] = {
  54         { .compatible = "simple-bus" },
  55         { .compatible = "simple-mfd" },
  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         .flags  = DM_FLAG_PRE_RELOC,
  64 };