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
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
/*
* Copyright (C) Maxime Coquelin 2015
* Author: Maxime Coquelin <mcoquelin.stm32@gmail.com>
* License terms: GNU General Public License (GPL), version 2
*
* Inspired by time-efm32.c from Uwe Kleine-Koenig
*/
#include <linux/kernel.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/clk.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include "timer-of.h"
#define TIM_CR1 0x00
#define TIM_DIER 0x0c
#define TIM_SR 0x10
#define TIM_EGR 0x14
#define TIM_PSC 0x28
#define TIM_ARR 0x2c
#define TIM_CR1_CEN BIT(0)
#define TIM_CR1_OPM BIT(3)
#define TIM_CR1_ARPE BIT(7)
#define TIM_DIER_UIE BIT(0)
#define TIM_SR_UIF BIT(0)
#define TIM_EGR_UG BIT(0)
static int stm32_clock_event_shutdown(struct clock_event_device *clkevt)
{
struct timer_of *to = to_timer_of(clkevt);
writel_relaxed(0, timer_of_base(to) + TIM_CR1);
return 0;
}
static int stm32_clock_event_set_periodic(struct clock_event_device *clkevt)
{
struct timer_of *to = to_timer_of(clkevt);
writel_relaxed(timer_of_period(to), timer_of_base(to) + TIM_ARR);
writel_relaxed(TIM_CR1_ARPE | TIM_CR1_CEN, timer_of_base(to) + TIM_CR1);
return 0;
}
static int stm32_clock_event_set_next_event(unsigned long evt,
struct clock_event_device *clkevt)
{
struct timer_of *to = to_timer_of(clkevt);
writel_relaxed(evt, timer_of_base(to) + TIM_ARR);
writel_relaxed(TIM_CR1_ARPE | TIM_CR1_OPM | TIM_CR1_CEN,
timer_of_base(to) + TIM_CR1);
return 0;
}
static irqreturn_t stm32_clock_event_handler(int irq, void *dev_id)
{
struct clock_event_device *clkevt = (struct clock_event_device *)dev_id;
struct timer_of *to = to_timer_of(clkevt);
writel_relaxed(0, timer_of_base(to) + TIM_SR);
clkevt->event_handler(clkevt);
return IRQ_HANDLED;
}
static void __init stm32_clockevent_init(struct timer_of *to)
{
unsigned long max_delta;
int prescaler;
to->clkevt.name = to->np->full_name;
to->clkevt.features = CLOCK_EVT_FEAT_PERIODIC;
to->clkevt.set_state_shutdown = stm32_clock_event_shutdown;
to->clkevt.set_state_periodic = stm32_clock_event_set_periodic;
to->clkevt.set_state_oneshot = stm32_clock_event_shutdown;
to->clkevt.tick_resume = stm32_clock_event_shutdown;
to->clkevt.set_next_event = stm32_clock_event_set_next_event;
/* Detect whether the timer is 16 or 32 bits */
writel_relaxed(~0U, timer_of_base(to) + TIM_ARR);
max_delta = readl_relaxed(timer_of_base(to) + TIM_ARR);
if (max_delta == ~0U) {
prescaler = 1;
to->clkevt.rating = 250;
} else {
prescaler = 1024;
to->clkevt.rating = 100;
}
writel_relaxed(0, timer_of_base(to) + TIM_ARR);
writel_relaxed(prescaler - 1, timer_of_base(to) + TIM_PSC);
writel_relaxed(TIM_EGR_UG, timer_of_base(to) + TIM_EGR);
writel_relaxed(0, timer_of_base(to) + TIM_SR);
writel_relaxed(TIM_DIER_UIE, timer_of_base(to) + TIM_DIER);
/* Adjust rate and period given the prescaler value */
to->of_clk.rate = DIV_ROUND_CLOSEST(to->of_clk.rate, prescaler);
to->of_clk.period = DIV_ROUND_UP(to->of_clk.rate, HZ);
clockevents_config_and_register(&to->clkevt,
timer_of_rate(to), 0x1, max_delta);
pr_info("%pOF: STM32 clockevent driver initialized (%d bits)\n",
to->np, max_delta == UINT_MAX ? 32 : 16);
}
static int __init stm32_timer_init(struct device_node *node)
{
struct reset_control *rstc;
struct timer_of *to;
int ret;
to = kzalloc(sizeof(*to), GFP_KERNEL);
if (!to)
return -ENOMEM;
to->flags = TIMER_OF_IRQ | TIMER_OF_CLOCK | TIMER_OF_BASE;
to->of_irq.handler = stm32_clock_event_handler;
ret = timer_of_init(node, to);
if (ret)
goto err;
rstc = of_reset_control_get(node, NULL);
if (!IS_ERR(rstc)) {
reset_control_assert(rstc);
reset_control_deassert(rstc);
}
stm32_clockevent_init(to);
return 0;
err:
kfree(to);
return ret;
}
TIMER_OF_DECLARE(stm32, "st,stm32-timer", stm32_timer_init);
|
