Based on kernel version 4.8. Page generated on 2016-10-06 23:10 EST.
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 26 struct gptimer_data { 27 uint32_t period, width; 28 }; 29 static struct gptimer_data data; 30 31 /* ... random driver state ... */ 32 33 static 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 54 static 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 } 81 module_init(gptimer_example_init); 82 83 static void __exit gptimer_example_exit(void) 84 { 85 disable_gptimers(TIMER5bit); 86 free_irq(SAMPLE_IRQ_TIMER, &data); 87 peripheral_free(P_TMR5); 88 } 89 module_exit(gptimer_example_exit); 90 91 MODULE_LICENSE("BSD");