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