jcs.org
"Das U-Boot" Source Tree
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * GXP timer driver
4 *
5 * (C) Copyright 2022 Hewlett Packard Enterprise Development LP.
6 * Author: Nick Hawkins <nick.hawkins@hpe.com>
7 * Author: Jean-Marie Verdun <verdun@hpe.com>
8 */
9
10#include <clk.h>
11#include <dm.h>
12#include <timer.h>
13#include <asm/io.h>
14
15#define USTIMELO 0x18
16#define USTIMEHI 0x1C
17
18struct gxp_timer_priv {
19 void __iomem *base;
20};
21
22static u64 gxp_timer_get_count(struct udevice *dev)
23{
24 struct gxp_timer_priv *priv = dev_get_priv(dev);
25 u64 val;
26
27 val = readl(priv->base + USTIMEHI);
28 val = (val << 32) | readl(priv->base + USTIMELO);
29
30 return val;
31}
32
33static int gxp_timer_probe(struct udevice *dev)
34{
35 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
36 struct gxp_timer_priv *priv = dev_get_priv(dev);
37
38 priv->base = dev_read_addr_ptr(dev);
39 if (!priv->base)
40 return -ENOENT;
41
42 uc_priv->clock_rate = 1000000;
43
44 return 0;
45}
46
47static const struct timer_ops gxp_timer_ops = {
48 .get_count = gxp_timer_get_count,
49};
50
51static const struct udevice_id gxp_timer_ids[] = {
52 { .compatible = "hpe,gxp-timer" },
53 {}
54};
55
56U_BOOT_DRIVER(gxp_timer) = {
57 .name = "gxp-timer",
58 .id = UCLASS_TIMER,
59 .of_match = gxp_timer_ids,
60 .priv_auto = sizeof(struct gxp_timer_priv),
61 .probe = gxp_timer_probe,
62 .ops = &gxp_timer_ops,
63 .flags = DM_FLAG_PRE_RELOC,
64};