diff options
author | Mike Frysinger <vapier@gentoo.org> | 2009-10-21 21:22:35 +0000 |
---|---|---|
committer | Mike Frysinger <vapier@gentoo.org> | 2009-12-15 00:15:04 -0500 |
commit | 4b60779d5ea76908c3bc82d93280b733335fce48 (patch) | |
tree | 4ee2014159244156117153197f0624ace75ef3fc /Documentation/blackfin | |
parent | 7a1a8cc1902af3a2a19636da3674008b2f1246db (diff) | |
download | kernel_samsung_tuna-4b60779d5ea76908c3bc82d93280b733335fce48.zip kernel_samsung_tuna-4b60779d5ea76908c3bc82d93280b733335fce48.tar.gz kernel_samsung_tuna-4b60779d5ea76908c3bc82d93280b733335fce48.tar.bz2 |
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 0000000..773dbb1 --- /dev/null +++ b/Documentation/blackfin/Makefile @@ -0,0 +1,6 @@ +obj-m := gptimers-example.o + +all: modules + +modules clean: + $(MAKE) -C ../.. SUBDIRS=$(PWD) $@ diff --git a/Documentation/blackfin/gptimers-example.c b/Documentation/blackfin/gptimers-example.c new file mode 100644 index 0000000..b1bd634 --- /dev/null +++ b/Documentation/blackfin/gptimers-example.c @@ -0,0 +1,83 @@ +/* + * Simple gptimers example + * http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:gptimers + * + * Copyright 2007-2009 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/interrupt.h> +#include <linux/module.h> + +#include <asm/gptimers.h> +#include <asm/portmux.h> + +/* ... random driver includes ... */ + +#define DRIVER_NAME "gptimer_example" + +struct gptimer_data { + uint32_t period, width; +}; +static struct gptimer_data data; + +/* ... random driver state ... */ + +static irqreturn_t gptimer_example_irq(int irq, void *dev_id) +{ + struct gptimer_data *data = dev_id; + + /* make sure it was our timer which caused the interrupt */ + if (!get_gptimer_intr(TIMER5_id)) + return IRQ_NONE; + + /* read the width/period values that were captured for the waveform */ + data->width = get_gptimer_pwidth(TIMER5_id); + data->period = get_gptimer_period(TIMER5_id); + + /* acknowledge the interrupt */ + clear_gptimer_intr(TIMER5_id); + + /* tell the upper layers we took care of things */ + return IRQ_HANDLED; +} + +/* ... random driver code ... */ + +static int __init gptimer_example_init(void) +{ + int ret; + + /* grab the peripheral pins */ + ret = peripheral_request(P_TMR5, DRIVER_NAME); + if (ret) { + printk(KERN_NOTICE DRIVER_NAME ": peripheral request failed\n"); + return ret; + } + + /* grab the IRQ for the timer */ + ret = request_irq(IRQ_TIMER5, gptimer_example_irq, IRQF_SHARED, DRIVER_NAME, &data); + if (ret) { + printk(KERN_NOTICE DRIVER_NAME ": IRQ request failed\n"); + peripheral_free(P_TMR5); + return ret; + } + + /* setup the timer and enable it */ + set_gptimer_config(TIMER5_id, WDTH_CAP | PULSE_HI | PERIOD_CNT | IRQ_ENA); + enable_gptimers(TIMER5bit); + + return 0; +} +module_init(gptimer_example_init); + +static void __exit gptimer_example_exit(void) +{ + disable_gptimers(TIMER5bit); + free_irq(IRQ_TIMER5, &data); + peripheral_free(P_TMR5); +} +module_exit(gptimer_example_exit); + +MODULE_LICENSE("BSD"); |