92 lines
2.0 KiB
C
92 lines
2.0 KiB
C
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/*
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* Simple gptimers example
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* http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:gptimers
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*
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* Copyright 2007-2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <asm/gptimers.h>
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#include <asm/portmux.h>
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/* ... random driver includes ... */
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#define DRIVER_NAME "gptimer_example"
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#ifdef IRQ_TIMER5
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#define SAMPLE_IRQ_TIMER IRQ_TIMER5
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#else
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#define SAMPLE_IRQ_TIMER IRQ_TIMER2
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#endif
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struct gptimer_data {
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uint32_t period, width;
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};
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static struct gptimer_data data;
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/* ... random driver state ... */
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static irqreturn_t gptimer_example_irq(int irq, void *dev_id)
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{
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struct gptimer_data *data = dev_id;
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/* make sure it was our timer which caused the interrupt */
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if (!get_gptimer_intr(TIMER5_id))
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return IRQ_NONE;
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/* read the width/period values that were captured for the waveform */
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data->width = get_gptimer_pwidth(TIMER5_id);
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data->period = get_gptimer_period(TIMER5_id);
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/* acknowledge the interrupt */
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clear_gptimer_intr(TIMER5_id);
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/* tell the upper layers we took care of things */
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return IRQ_HANDLED;
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}
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/* ... random driver code ... */
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static int __init gptimer_example_init(void)
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{
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int ret;
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/* grab the peripheral pins */
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ret = peripheral_request(P_TMR5, DRIVER_NAME);
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if (ret) {
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printk(KERN_NOTICE DRIVER_NAME ": peripheral request failed\n");
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return ret;
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}
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/* grab the IRQ for the timer */
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ret = request_irq(SAMPLE_IRQ_TIMER, gptimer_example_irq,
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IRQF_SHARED, DRIVER_NAME, &data);
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if (ret) {
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printk(KERN_NOTICE DRIVER_NAME ": IRQ request failed\n");
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peripheral_free(P_TMR5);
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return ret;
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}
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/* setup the timer and enable it */
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set_gptimer_config(TIMER5_id,
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WDTH_CAP | PULSE_HI | PERIOD_CNT | IRQ_ENA);
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enable_gptimers(TIMER5bit);
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return 0;
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}
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module_init(gptimer_example_init);
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static void __exit gptimer_example_exit(void)
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{
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disable_gptimers(TIMER5bit);
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free_irq(SAMPLE_IRQ_TIMER, &data);
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peripheral_free(P_TMR5);
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}
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module_exit(gptimer_example_exit);
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MODULE_LICENSE("BSD");
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