drivers/misc/sandbox_adder.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Sandbox adder for p2sb testing
   4  *
   5  * Copyright 2019 Google LLC
   6  */
   7
   8 #define LOG_CATEGORY UCLASS_MISC
   9
  10 #include <common.h>
  11 #include <axi.h>
  12 #include <dm.h>
  13 #include <misc.h>
  14 #include <p2sb.h>
  15 #include <asm/io.h>
  16
  17 struct sandbox_adder_priv {
  18         ulong base;
  19 };
  20
  21 int sandbox_adder_read(struct udevice *dev, ulong address, void *data,
  22                        enum axi_size_t size)
  23 {
  24         struct p2sb_child_plat *pplat = dev_get_parent_plat(dev);
  25         u32 *val = data;
  26
  27         *val = pplat->pid << 24 | address;
  28
  29         return 0;
  30 }
  31
  32 int sandbox_adder_write(struct udevice *dev, ulong address, void *data,
  33                         enum axi_size_t size)
  34 {
  35         return 0;
  36 }
  37
  38 static int sandbox_adder_probe(struct udevice *dev)
  39 {
  40         return 0;
  41 }
  42
  43 static struct axi_ops sandbox_adder_ops = {
  44         .read   = sandbox_adder_read,
  45         .write  = sandbox_adder_write,
  46 };
  47
  48 static const struct udevice_id sandbox_adder_ids[] = {
  49         { .compatible = "sandbox,adder" },
  50         { }
  51 };
  52
  53 U_BOOT_DRIVER(adder_sandbox) = {
  54         .name = "sandbox_adder",
  55         .id = UCLASS_AXI,
  56         .of_match = sandbox_adder_ids,
  57         .probe = sandbox_adder_probe,
  58         .ops = &sandbox_adder_ops,
  59         .priv_auto      = sizeof(struct sandbox_adder_priv),
  60 };