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4b60779d MF |
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 | struct gptimer_data { | |
21 | uint32_t period, width; | |
22 | }; | |
23 | static struct gptimer_data data; | |
24 | ||
25 | /* ... random driver state ... */ | |
26 | ||
27 | static irqreturn_t gptimer_example_irq(int irq, void *dev_id) | |
28 | { | |
29 | struct gptimer_data *data = dev_id; | |
30 | ||
31 | /* make sure it was our timer which caused the interrupt */ | |
32 | if (!get_gptimer_intr(TIMER5_id)) | |
33 | return IRQ_NONE; | |
34 | ||
35 | /* read the width/period values that were captured for the waveform */ | |
36 | data->width = get_gptimer_pwidth(TIMER5_id); | |
37 | data->period = get_gptimer_period(TIMER5_id); | |
38 | ||
39 | /* acknowledge the interrupt */ | |
40 | clear_gptimer_intr(TIMER5_id); | |
41 | ||
42 | /* tell the upper layers we took care of things */ | |
43 | return IRQ_HANDLED; | |
44 | } | |
45 | ||
46 | /* ... random driver code ... */ | |
47 | ||
48 | static int __init gptimer_example_init(void) | |
49 | { | |
50 | int ret; | |
51 | ||
52 | /* grab the peripheral pins */ | |
53 | ret = peripheral_request(P_TMR5, DRIVER_NAME); | |
54 | if (ret) { | |
55 | printk(KERN_NOTICE DRIVER_NAME ": peripheral request failed\n"); | |
56 | return ret; | |
57 | } | |
58 | ||
59 | /* grab the IRQ for the timer */ | |
60 | ret = request_irq(IRQ_TIMER5, gptimer_example_irq, IRQF_SHARED, DRIVER_NAME, &data); | |
61 | if (ret) { | |
62 | printk(KERN_NOTICE DRIVER_NAME ": IRQ request failed\n"); | |
63 | peripheral_free(P_TMR5); | |
64 | return ret; | |
65 | } | |
66 | ||
67 | /* setup the timer and enable it */ | |
68 | set_gptimer_config(TIMER5_id, WDTH_CAP | PULSE_HI | PERIOD_CNT | IRQ_ENA); | |
69 | enable_gptimers(TIMER5bit); | |
70 | ||
71 | return 0; | |
72 | } | |
73 | module_init(gptimer_example_init); | |
74 | ||
75 | static void __exit gptimer_example_exit(void) | |
76 | { | |
77 | disable_gptimers(TIMER5bit); | |
78 | free_irq(IRQ_TIMER5, &data); | |
79 | peripheral_free(P_TMR5); | |
80 | } | |
81 | module_exit(gptimer_example_exit); | |
82 | ||
83 | MODULE_LICENSE("BSD"); |