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
|
/*
* Copyright (C) 2013 Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <common.h>
#include <init.h>
#include <clock.h>
#include <linux/clk.h>
#include <io.h>
#define TIMER_CTRL_OFF 0x0000
#define TIMER0_EN 0x0001
#define TIMER0_RELOAD_EN 0x0002
#define TIMER0_25MHZ 0x0800
#define TIMER0_DIV(div) ((div) << 19)
#define TIMER1_EN 0x0004
#define TIMER1_RELOAD_EN 0x0008
#define TIMER1_25MHZ 0x1000
#define TIMER1_DIV(div) ((div) << 22)
#define TIMER_EVENTS_STATUS 0x0004
#define TIMER0_CLR_MASK (~0x1)
#define TIMER1_CLR_MASK (~0x100)
#define TIMER0_RELOAD_OFF 0x0010
#define TIMER0_VAL_OFF 0x0014
#define TIMER1_RELOAD_OFF 0x0018
#define TIMER1_VAL_OFF 0x001c
#define TIMER_DIVIDER_SHIFT 5
static __iomem void *timer_base;
uint64_t mvebu_clocksource_read(void)
{
return 0 - __raw_readl(timer_base + TIMER0_VAL_OFF);
}
static struct clocksource cs = {
.read = mvebu_clocksource_read,
.mask = CLOCKSOURCE_MASK(32),
.shift = 10,
};
static int mvebu_timer_probe(struct device_d *dev)
{
struct clk *tclk;
u32 val;
timer_base = dev_request_mem_region(dev, 0);
tclk = clk_get(dev, NULL);
val = __raw_readl(timer_base + TIMER_CTRL_OFF);
val &= ~TIMER0_25MHZ;
__raw_writel(val, timer_base + TIMER_CTRL_OFF);
__raw_writel(0xffffffff, timer_base + TIMER0_VAL_OFF);
__raw_writel(0xffffffff, timer_base + TIMER0_RELOAD_OFF);
val = __raw_readl(timer_base + TIMER_CTRL_OFF);
val |= TIMER0_EN | TIMER0_RELOAD_EN | TIMER0_DIV(TIMER_DIVIDER_SHIFT);
__raw_writel(val, timer_base + TIMER_CTRL_OFF);
cs.mult = clocksource_hz2mult(clk_get_rate(tclk), cs.shift);
init_clock(&cs);
return 0;
}
static struct of_device_id mvebu_timer_dt_ids[] = {
{ .compatible = "marvell,armada-370-xp-timer", },
{ }
};
static struct driver_d mvebu_timer_driver = {
.name = "mvebu-timer",
.probe = mvebu_timer_probe,
.of_compatible = DRV_OF_COMPAT(mvebu_timer_dt_ids),
};
static int mvebu_timer_init(void)
{
return platform_driver_register(&mvebu_timer_driver);
}
postcore_initcall(mvebu_timer_init);
|
