1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/* SPDX-License-Identifier: GPL-2.0+
*
* Copyright 2019 Broadcom Ltd.
*/
#include <common.h>
#include <dm.h>
#include <timer.h>
#include <clk.h>
#include <asm/io.h>
#include <linux/ioport.h>
#include <linux/io.h>
// periph timer registers
#define TIMER_CTL 0
#define TIMER_CNT 0x10
#define BCM6XXX_TIMER_ENABLE BIT(31)
#define BCM6XXX_TIMER_CNT_MASK 0x3fffffff
#define BCM6XXX_TIMER_CNT_HIGH_SHIFT 30
struct bcm6xxx_timer_priv {
void __iomem *reg_base;
u64 cnt_high;
u32 cnt_low;
};
static int bcm6xxx_timer_get_count(struct udevice *dev, u64 *count)
{
struct bcm6xxx_timer_priv *priv = dev_get_priv(dev);
u32 val = readl(priv->reg_base + TIMER_CNT) & BCM6XXX_TIMER_CNT_MASK;
/* hardware counter overflow */
if (val < priv->cnt_low)
priv->cnt_high++;
priv->cnt_low = val;
*count = priv->cnt_high<<BCM6XXX_TIMER_CNT_HIGH_SHIFT |
priv->cnt_low;
return 0;
}
static void bcm6xxx_timer_start(struct udevice *dev)
{
struct bcm6xxx_timer_priv *priv = dev_get_priv(dev);
writel(BCM6XXX_TIMER_ENABLE | BCM6XXX_TIMER_CNT_MASK, priv->reg_base + TIMER_CTL);
return;
}
static int bcm6xxx_timer_probe(struct udevice *dev)
{
struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct bcm6xxx_timer_priv *priv = dev_get_priv(dev);
struct clk clk;
struct resource res;
int ret;
priv->reg_base = dev_remap_addr(dev);
printf("timer reg_base = %p\n", priv->reg_base);
if (priv->reg_base == NULL)
return -ENOENT;
ret = clk_get_by_index(dev, 0, &clk);
if (ret)
return ret;
uc_priv->clock_rate = clk_get_rate(&clk);
if (!uc_priv->clock_rate)
return -EINVAL;
priv->cnt_high = 0;
priv->cnt_low = 0;
bcm6xxx_timer_start(dev);
return 0;
}
static const struct timer_ops bcm6xxx_timer_ops = {
.get_count = bcm6xxx_timer_get_count,
};
static const struct udevice_id bcm6xxx_timer_ids[] = {
{ .compatible = "brcm,bcm6xxx-timer" },
{ }
};
U_BOOT_DRIVER(bcm6xxx_timer) = {
.name = "bcm6xxx_timer",
.id = UCLASS_TIMER,
.of_match = bcm6xxx_timer_ids,
.priv_auto_alloc_size = sizeof(struct bcm6xxx_timer_priv),
.probe = bcm6xxx_timer_probe,
.ops = &bcm6xxx_timer_ops,
.flags = DM_FLAG_PRE_RELOC,
};
|
