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