1/*
 2 * Simple gptimers example
 3 *	http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:gptimers
 4 *
 5 * Copyright 2007-2009 Analog Devices Inc.
 6 *
 7 * Licensed under the GPL-2 or later.
 8 */
 9
10#include <linux/interrupt.h>
11#include <linux/module.h>
12
13#include <asm/gptimers.h>
14#include <asm/portmux.h>
15
16/* ... random driver includes ... */
17
18#define DRIVER_NAME "gptimer_example"
19
20#ifdef IRQ_TIMER5
21#define SAMPLE_IRQ_TIMER IRQ_TIMER5
22#else
23#define SAMPLE_IRQ_TIMER IRQ_TIMER2
24#endif
25
26struct gptimer_data {
27	uint32_t period, width;
28};
29static struct gptimer_data data;
30
31/* ... random driver state ... */
32
33static irqreturn_t gptimer_example_irq(int irq, void *dev_id)
34{
35	struct gptimer_data *data = dev_id;
36
37	/* make sure it was our timer which caused the interrupt */
38	if (!get_gptimer_intr(TIMER5_id))
39		return IRQ_NONE;
40
41	/* read the width/period values that were captured for the waveform */
42	data->width = get_gptimer_pwidth(TIMER5_id);
43	data->period = get_gptimer_period(TIMER5_id);
44
45	/* acknowledge the interrupt */
46	clear_gptimer_intr(TIMER5_id);
47
48	/* tell the upper layers we took care of things */
49	return IRQ_HANDLED;
50}
51
52/* ... random driver code ... */
53
54static int __init gptimer_example_init(void)
55{
56	int ret;
57
58	/* grab the peripheral pins */
59	ret = peripheral_request(P_TMR5, DRIVER_NAME);
60	if (ret) {
61		printk(KERN_NOTICE DRIVER_NAME ": peripheral request failed\n");
62		return ret;
63	}
64
65	/* grab the IRQ for the timer */
66	ret = request_irq(SAMPLE_IRQ_TIMER, gptimer_example_irq,
67			IRQF_SHARED, DRIVER_NAME, &data);
68	if (ret) {
69		printk(KERN_NOTICE DRIVER_NAME ": IRQ request failed\n");
70		peripheral_free(P_TMR5);
71		return ret;
72	}
73
74	/* setup the timer and enable it */
75	set_gptimer_config(TIMER5_id,
76			WDTH_CAP | PULSE_HI | PERIOD_CNT | IRQ_ENA);
77	enable_gptimers(TIMER5bit);
78
79	return 0;
80}
81module_init(gptimer_example_init);
82
83static void __exit gptimer_example_exit(void)
84{
85	disable_gptimers(TIMER5bit);
86	free_irq(SAMPLE_IRQ_TIMER, &data);
87	peripheral_free(P_TMR5);
88}
89module_exit(gptimer_example_exit);
90
91MODULE_LICENSE("BSD");