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Linux/arch/mips/kernel/cevt-ds1287.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  *  DS1287 clockevent driver
  4  *
  5  *  Copyright (C) 2008  Yoichi Yuasa <yuasa@linux-mips.org>
  6  */
  7 #include <linux/clockchips.h>
  8 #include <linux/init.h>
  9 #include <linux/interrupt.h>
 10 #include <linux/mc146818rtc.h>
 11 #include <linux/irq.h>
 12 
 13 #include <asm/time.h>
 14 
 15 int ds1287_timer_state(void)
 16 {
 17         return (CMOS_READ(RTC_REG_C) & RTC_PF) != 0;
 18 }
 19 
 20 int ds1287_set_base_clock(unsigned int hz)
 21 {
 22         u8 rate;
 23 
 24         switch (hz) {
 25         case 128:
 26                 rate = 0x9;
 27                 break;
 28         case 256:
 29                 rate = 0x8;
 30                 break;
 31         case 1024:
 32                 rate = 0x6;
 33                 break;
 34         default:
 35                 return -EINVAL;
 36         }
 37 
 38         CMOS_WRITE(RTC_REF_CLCK_32KHZ | rate, RTC_REG_A);
 39 
 40         return 0;
 41 }
 42 
 43 static int ds1287_set_next_event(unsigned long delta,
 44                                  struct clock_event_device *evt)
 45 {
 46         return -EINVAL;
 47 }
 48 
 49 static int ds1287_shutdown(struct clock_event_device *evt)
 50 {
 51         u8 val;
 52 
 53         spin_lock(&rtc_lock);
 54 
 55         val = CMOS_READ(RTC_REG_B);
 56         val &= ~RTC_PIE;
 57         CMOS_WRITE(val, RTC_REG_B);
 58 
 59         spin_unlock(&rtc_lock);
 60         return 0;
 61 }
 62 
 63 static int ds1287_set_periodic(struct clock_event_device *evt)
 64 {
 65         u8 val;
 66 
 67         spin_lock(&rtc_lock);
 68 
 69         val = CMOS_READ(RTC_REG_B);
 70         val |= RTC_PIE;
 71         CMOS_WRITE(val, RTC_REG_B);
 72 
 73         spin_unlock(&rtc_lock);
 74         return 0;
 75 }
 76 
 77 static void ds1287_event_handler(struct clock_event_device *dev)
 78 {
 79 }
 80 
 81 static struct clock_event_device ds1287_clockevent = {
 82         .name                   = "ds1287",
 83         .features               = CLOCK_EVT_FEAT_PERIODIC,
 84         .set_next_event         = ds1287_set_next_event,
 85         .set_state_shutdown     = ds1287_shutdown,
 86         .set_state_periodic     = ds1287_set_periodic,
 87         .tick_resume            = ds1287_shutdown,
 88         .event_handler          = ds1287_event_handler,
 89 };
 90 
 91 static irqreturn_t ds1287_interrupt(int irq, void *dev_id)
 92 {
 93         struct clock_event_device *cd = &ds1287_clockevent;
 94 
 95         /* Ack the RTC interrupt. */
 96         CMOS_READ(RTC_REG_C);
 97 
 98         cd->event_handler(cd);
 99 
100         return IRQ_HANDLED;
101 }
102 
103 static struct irqaction ds1287_irqaction = {
104         .handler        = ds1287_interrupt,
105         .flags          = IRQF_PERCPU | IRQF_TIMER,
106         .name           = "ds1287",
107 };
108 
109 int __init ds1287_clockevent_init(int irq)
110 {
111         struct clock_event_device *cd;
112 
113         cd = &ds1287_clockevent;
114         cd->rating = 100;
115         cd->irq = irq;
116         clockevent_set_clock(cd, 32768);
117         cd->max_delta_ns = clockevent_delta2ns(0x7fffffff, cd);
118         cd->max_delta_ticks = 0x7fffffff;
119         cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
120         cd->min_delta_ticks = 0x300;
121         cd->cpumask = cpumask_of(0);
122 
123         clockevents_register_device(&ds1287_clockevent);
124 
125         return setup_irq(irq, &ds1287_irqaction);
126 }
127 

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