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Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Patrice Chotard347cb2e2017-02-21 13:37:05 +01002/*
Patrice Chotardfb48bc42017-10-23 09:53:57 +02003 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
4 * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
Patrice Chotard347cb2e2017-02-21 13:37:05 +01005 */
6
7#include <common.h>
8#include <dm.h>
9#include <fdtdec.h>
10#include <timer.h>
11
12#include <asm/io.h>
13#include <asm/arch-armv7/globaltimer.h>
14
15DECLARE_GLOBAL_DATA_PTR;
16
17struct sti_timer_priv {
18 struct globaltimer *global_timer;
19};
20
21static int sti_timer_get_count(struct udevice *dev, u64 *count)
22{
23 struct sti_timer_priv *priv = dev_get_priv(dev);
24 struct globaltimer *global_timer = priv->global_timer;
25 u32 low, high;
26 u64 timer;
27 u32 old = readl(&global_timer->cnt_h);
28
29 while (1) {
30 low = readl(&global_timer->cnt_l);
31 high = readl(&global_timer->cnt_h);
32 if (old == high)
33 break;
34 else
35 old = high;
36 }
37 timer = high;
38 *count = (u64)((timer << 32) | low);
39
40 return 0;
41}
42
43static int sti_timer_probe(struct udevice *dev)
44{
45 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
46 struct sti_timer_priv *priv = dev_get_priv(dev);
47 fdt_addr_t addr;
48
49 uc_priv->clock_rate = CONFIG_SYS_HZ_CLOCK;
50
51 /* get arm global timer base address */
52 addr = fdtdec_get_addr(gd->fdt_blob, dev_of_offset(dev), "reg");
53 priv->global_timer = (struct globaltimer *)addr;
54
55 /* init timer */
56 writel(0x01, &priv->global_timer->ctl);
57
58 return 0;
59}
60
61static const struct timer_ops sti_timer_ops = {
62 .get_count = sti_timer_get_count,
63};
64
65static const struct udevice_id sti_timer_ids[] = {
66 { .compatible = "arm,cortex-a9-global-timer" },
67 {}
68};
69
70U_BOOT_DRIVER(sti_timer) = {
71 .name = "sti_timer",
72 .id = UCLASS_TIMER,
73 .of_match = sti_timer_ids,
74 .priv_auto_alloc_size = sizeof(struct sti_timer_priv),
75 .probe = sti_timer_probe,
76 .ops = &sti_timer_ops,
Patrice Chotard347cb2e2017-02-21 13:37:05 +010077};