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
  10 DECLARE_GLOBAL_DATA_PTR;
  11
  12 struct simple_bus_plat {
  13         u32 base;
  14         u32 size;
  15         u32 target;
  16 };
  17
  18 fdt_addr_t simple_bus_translate(struct udevice *dev, fdt_addr_t addr)
  19 {
  20         struct simple_bus_plat *plat = dev_get_uclass_platdata(dev);
  21
  22         if (addr >= plat->base && addr < plat->base + plat->size)
  23                 addr = (addr - plat->base) + plat->target;
  24
  25         return addr;
  26 }
  27
  28 static int simple_bus_post_bind(struct udevice *dev)
  29 {
  30 #if CONFIG_IS_ENABLED(OF_PLATDATA)
  31         return 0;
  32 #else
  33         u32 cell[3];
  34         int ret;
  35
  36         ret = dev_read_u32_array(dev, "ranges", cell, ARRAY_SIZE(cell));
  37         if (!ret) {
  38                 struct simple_bus_plat *plat = dev_get_uclass_platdata(dev);
  39
  40                 plat->base = cell[0];
  41                 plat->target = cell[1];
  42                 plat->size = cell[2];
  43         }
  44
  45         return dm_scan_fdt_dev(dev);
  46 #endif
  47 }
  48
  49 UCLASS_DRIVER(simple_bus) = {
  50         .id             = UCLASS_SIMPLE_BUS,
  51         .name           = "simple_bus",
  52         .post_bind      = simple_bus_post_bind,
  53         .per_device_platdata_auto_alloc_size = sizeof(struct simple_bus_plat),
  54 };
  55
  56 static const struct udevice_id generic_simple_bus_ids[] = {
  57         { .compatible = "simple-bus" },
  58         { .compatible = "simple-mfd" },
  59         { }
  60 };
  61
  62 U_BOOT_DRIVER(simple_bus_drv) = {
  63         .name   = "generic_simple_bus",
  64         .id     = UCLASS_SIMPLE_BUS,
  65         .of_match = generic_simple_bus_ids,
  66 };