drivers/hwspinlock/sandbox_hwspinlock.c

   1 // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
   2 /*
   3  * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
   4  */
   5
   6 #include <common.h>
   7 #include <dm.h>
   8 #include <hwspinlock.h>
   9 #include <asm/state.h>
  10
  11 static int sandbox_lock(struct udevice *dev, int index)
  12 {
  13         struct sandbox_state *state = state_get_current();
  14
  15         if (index != 0)
  16                 return -1;
  17
  18         if (state->hwspinlock)
  19                 return -1;
  20
  21         state->hwspinlock = true;
  22
  23         return 0;
  24 }
  25
  26 static int sandbox_unlock(struct udevice *dev, int index)
  27 {
  28         struct sandbox_state *state = state_get_current();
  29
  30         if (index != 0)
  31                 return -1;
  32
  33         if (!state->hwspinlock)
  34                 return -1;
  35
  36         state->hwspinlock = false;
  37
  38         return 0;
  39 }
  40
  41 static const struct hwspinlock_ops sandbox_hwspinlock_ops = {
  42         .lock = sandbox_lock,
  43         .unlock = sandbox_unlock,
  44 };
  45
  46 static const struct udevice_id sandbox_hwspinlock_ids[] = {
  47         { .compatible = "sandbox,hwspinlock" },
  48         {}
  49 };
  50
  51 U_BOOT_DRIVER(hwspinlock_sandbox) = {
  52         .name = "hwspinlock_sandbox",
  53         .id = UCLASS_HWSPINLOCK,
  54         .of_match = sandbox_hwspinlock_ids,
  55         .ops = &sandbox_hwspinlock_ops,
  56 };