Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Open Menu /drivers/counter/counter_tmr_cmsdk_apb.c
Loading...
  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
/*
 * Copyright (c) 2016 Linaro Limited.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <counter.h>
#include <device.h>
#include <errno.h>
#include <init.h>
#include <soc.h>
#include <clock_control/arm_clock_control.h>

#include "timer_cmsdk_apb.h"

#define TIMER_MAX_RELOAD	0xFFFFFFFF

struct counter_tmr_cmsdk_apb_cfg {
	volatile struct timer_cmsdk_apb *timer;
	/* Timer Clock control in Active State */
	const struct arm_clock_control_t timer_cc_as;
	/* Timer Clock control in Sleep State */
	const struct arm_clock_control_t timer_cc_ss;
	/* Timer Clock control in Deep Sleep State */
	const struct arm_clock_control_t timer_cc_dss;
};

static int counter_tmr_cmsdk_apb_start(struct device *dev)
{
	const struct counter_tmr_cmsdk_apb_cfg * const cfg =
						dev->config->config_info;

	/* Set the timer to Max reload */
	cfg->timer->reload = TIMER_MAX_RELOAD;

	/* Enable the timer */
	cfg->timer->ctrl = TIMER_CTRL_EN;

	return 0;
}

static int counter_tmr_cmsdk_apb_stop(struct device *dev)
{
	const struct counter_tmr_cmsdk_apb_cfg * const cfg =
						dev->config->config_info;

	/* Disable the timer */
	cfg->timer->ctrl = 0x0;

	return 0;
}

static u32_t counter_tmr_cmsdk_apb_read(struct device *dev)
{
	const struct counter_tmr_cmsdk_apb_cfg * const cfg =
						dev->config->config_info;

	/* Return Counter Value */
	u32_t value = 0;

	value = TIMER_MAX_RELOAD - cfg->timer->value;

	return value;
}

static int counter_tmr_cmsdk_apb_set_alarm(struct device *dev,
					   counter_callback_t callback,
					   u32_t count, void *user_data)
{
	return -ENODEV;
}

static const struct counter_driver_api counter_tmr_cmsdk_apb_api = {
	.start = counter_tmr_cmsdk_apb_start,
	.stop = counter_tmr_cmsdk_apb_stop,
	.read = counter_tmr_cmsdk_apb_read,
	.set_alarm = counter_tmr_cmsdk_apb_set_alarm,
};

static int counter_tmr_cmsdk_apb_init(struct device *dev)
{
#ifdef CONFIG_CLOCK_CONTROL
	/* Enable clock for subsystem */
	struct device *clk =
		device_get_binding(CONFIG_ARM_CLOCK_CONTROL_DEV_NAME);

	const struct counter_tmr_cmsdk_apb_cfg * const cfg =
						dev->config->config_info;

#ifdef CONFIG_SOC_SERIES_BEETLE
	clock_control_on(clk, (clock_control_subsys_t *) &cfg->timer_cc_as);
	clock_control_on(clk, (clock_control_subsys_t *) &cfg->timer_cc_ss);
	clock_control_on(clk, (clock_control_subsys_t *) &cfg->timer_cc_dss);
#endif /* CONFIG_SOC_SERIES_BEETLE */
#else
	ARG_UNUSED(dev);
#endif /* CONFIG_CLOCK_CONTROL */

	return 0;
}

/* COUNTER 0 */
#ifdef CONFIG_COUNTER_TMR_CMSDK_APB_0
static const struct counter_tmr_cmsdk_apb_cfg counter_tmr_cmsdk_apb_cfg_0 = {
	.timer = ((volatile struct timer_cmsdk_apb *)CMSDK_APB_TIMER0),
	.timer_cc_as = {.bus = CMSDK_APB, .state = SOC_ACTIVE,
			.device = CMSDK_APB_TIMER0,},
	.timer_cc_ss = {.bus = CMSDK_APB, .state = SOC_SLEEP,
			.device = CMSDK_APB_TIMER0,},
	.timer_cc_dss = {.bus = CMSDK_APB, .state = SOC_DEEPSLEEP,
			 .device = CMSDK_APB_TIMER0,},
};

DEVICE_AND_API_INIT(counter_tmr_cmsdk_apb_0,
		    CONFIG_COUNTER_TMR_CMSDK_APB_0_DEV_NAME,
		    counter_tmr_cmsdk_apb_init, NULL,
		    &counter_tmr_cmsdk_apb_cfg_0, POST_KERNEL,
		    CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
		    &counter_tmr_cmsdk_apb_api);
#endif /* CONFIG_COUNTER_TMR_CMSDK_APB_0 */

/* COUNTER 1 */
#ifdef CONFIG_COUNTER_TMR_CMSDK_APB_1
static const struct counter_tmr_cmsdk_apb_cfg counter_tmr_cmsdk_apb_cfg_1 = {
	.timer = ((volatile struct timer_cmsdk_apb *)CMSDK_APB_TIMER1),
	.timer_cc_as = {.bus = CMSDK_APB, .state = SOC_ACTIVE,
			.device = CMSDK_APB_TIMER1,},
	.timer_cc_ss = {.bus = CMSDK_APB, .state = SOC_SLEEP,
			.device = CMSDK_APB_TIMER1,},
	.timer_cc_dss = {.bus = CMSDK_APB, .state = SOC_DEEPSLEEP,
			 .device = CMSDK_APB_TIMER1,},
};

DEVICE_AND_API_INIT(counter_tmr_cmsdk_apb_1,
		    CONFIG_COUNTER_TMR_CMSDK_APB_1_DEV_NAME,
		    counter_tmr_cmsdk_apb_init, NULL,
		    &counter_tmr_cmsdk_apb_cfg_1, POST_KERNEL,
		    CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
		    &counter_tmr_cmsdk_apb_api);
#endif /* CONFIG_COUNTER_TMR_CMSDK_APB_1 */