drivers/timer/sandbox_timer.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
   4  */
   5
   6 #include <common.h>
   7 #include <dm.h>
   8 #include <errno.h>
   9 #include <timer.h>
  10 #include <os.h>
  11
  12 #define SANDBOX_TIMER_RATE      1000000
  13
  14 /* system timer offset in ms */
  15 static unsigned long sandbox_timer_offset;
  16
  17 void timer_test_add_offset(unsigned long offset)
  18 {
  19         sandbox_timer_offset += offset;
  20 }
  21
  22 u64 notrace timer_early_get_count(void)
  23 {
  24         return os_get_nsec() / 1000 + sandbox_timer_offset * 1000;
  25 }
  26
  27 unsigned long notrace timer_early_get_rate(void)
  28 {
  29         return SANDBOX_TIMER_RATE;
  30 }
  31
  32 static notrace int sandbox_timer_get_count(struct udevice *dev, u64 *count)
  33 {
  34         *count = timer_early_get_count();
  35
  36         return 0;
  37 }
  38
  39 static int sandbox_timer_probe(struct udevice *dev)
  40 {
  41         struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
  42
  43         if (!uc_priv->clock_rate)
  44                 uc_priv->clock_rate = SANDBOX_TIMER_RATE;
  45
  46         return 0;
  47 }
  48
  49 static const struct timer_ops sandbox_timer_ops = {
  50         .get_count = sandbox_timer_get_count,
  51 };
  52
  53 static const struct udevice_id sandbox_timer_ids[] = {
  54         { .compatible = "sandbox,timer" },
  55         { }
  56 };
  57
  58 U_BOOT_DRIVER(sandbox_timer) = {
  59         .name   = "sandbox_timer",
  60         .id     = UCLASS_TIMER,
  61         .of_match = sandbox_timer_ids,
  62         .probe = sandbox_timer_probe,
  63         .ops    = &sandbox_timer_ops,
  64         .flags = DM_FLAG_PRE_RELOC,
  65 };
  66
  67 /* This is here in case we don't have a device tree */
  68 U_BOOT_DEVICE(sandbox_timer_non_fdt) = {
  69         .name = "sandbox_timer",
  70 };