diff options
author | Mike Frysinger <vapier@gentoo.org> | 2009-10-21 17:22:35 -0400 |
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committer | Mike Frysinger <vapier@gentoo.org> | 2009-12-15 00:15:04 -0500 |
commit | 4b60779d5ea76908c3bc82d93280b733335fce48 (patch) | |
tree | 4ee2014159244156117153197f0624ace75ef3fc /Documentation/blackfin | |
parent | 7a1a8cc1902af3a2a19636da3674008b2f1246db (diff) |
Blackfin: add an example showing how to use the gptimers API
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'Documentation/blackfin')
-rw-r--r-- | Documentation/blackfin/Makefile | 6 | ||||
-rw-r--r-- | Documentation/blackfin/gptimers-example.c | 83 |
2 files changed, 89 insertions, 0 deletions
diff --git a/Documentation/blackfin/Makefile b/Documentation/blackfin/Makefile new file mode 100644 index 000000000000..773dbb103f1c --- /dev/null +++ b/Documentation/blackfin/Makefile | |||
@@ -0,0 +1,6 @@ | |||
1 | obj-m := gptimers-example.o | ||
2 | |||
3 | all: modules | ||
4 | |||
5 | modules clean: | ||
6 | $(MAKE) -C ../.. SUBDIRS=$(PWD) $@ | ||
diff --git a/Documentation/blackfin/gptimers-example.c b/Documentation/blackfin/gptimers-example.c new file mode 100644 index 000000000000..b1bd6340e748 --- /dev/null +++ b/Documentation/blackfin/gptimers-example.c | |||
@@ -0,0 +1,83 @@ | |||
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"); | ||