LXR uboot/drivers/rtc/mvrtc.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2011
   4 * Jason Cooper <u-boot@lakedaemon.net>
   5 */
   6
   7/*
   8 * Date & Time support for Marvell Integrated RTC
   9 */
  10
  11#include <common.h>
  12#include <command.h>
  13#include <dm.h>
  14#include <rtc.h>
  15#include <asm/io.h>
  16#include <linux/delay.h>
  17#include "mvrtc.h"
  18
  19/* This RTC does not support century, so we assume 20 */
  20#define CENTURY 20
  21
  22static int __mv_rtc_get(struct mvrtc_registers *regs, struct rtc_time *t)
  23{
  24        u32 time;
  25        u32 date;
  26
  27        /* read the time register */
  28        time = readl(&regs->time);
  29
  30        /* read the date register */
  31        date = readl(&regs->date);
  32
  33        /* test for 12 hour clock (can't tell if it's am/pm) */
  34        if (time & MVRTC_HRFMT_MSK) {
  35                printf("Error: RTC in 12 hour mode, can't determine AM/PM.\n");
  36                return -1;
  37        }
  38
  39        /* time */
  40        t->tm_sec  = bcd2bin((time >> MVRTC_SEC_SFT)  & MVRTC_SEC_MSK);
  41        t->tm_min  = bcd2bin((time >> MVRTC_MIN_SFT)  & MVRTC_MIN_MSK);
  42        t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK);
  43        t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT)  & MVRTC_DAY_MSK);
  44        t->tm_wday--;
  45
  46        /* date */
  47        t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK);
  48        t->tm_mon  = bcd2bin((date >> MVRTC_MON_SFT)  & MVRTC_MON_MSK);
  49        t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK);
  50        t->tm_year += CENTURY * 100;
  51
  52        /* not supported in this RTC */
  53        t->tm_yday  = 0;
  54        t->tm_isdst = 0;
  55
  56        return 0;
  57}
  58
  59#ifndef CONFIG_DM_RTC
  60int rtc_get(struct rtc_time *t)
  61{
  62        struct mvrtc_registers *regs;
  63
  64        regs = (struct mvrtc_registers *)KW_RTC_BASE;
  65        return __mv_rtc_get(regs, t);
  66}
  67#endif /* !CONFIG_DM_RTC */
  68
  69static int __mv_rtc_set(struct mvrtc_registers *regs, const struct rtc_time *t)
  70{
  71        u32 time = 0; /* sets hour format bit to zero, 24hr format. */
  72        u32 date = 0;
  73
  74        /* check that this code isn't 80+ years old ;-) */
  75        if ((t->tm_year / 100) != CENTURY)
  76                printf("Warning: Only century %d supported.\n", CENTURY);
  77
  78        /* time */
  79        time |= (bin2bcd(t->tm_sec)      & MVRTC_SEC_MSK)  << MVRTC_SEC_SFT;
  80        time |= (bin2bcd(t->tm_min)      & MVRTC_MIN_MSK)  << MVRTC_MIN_SFT;
  81        time |= (bin2bcd(t->tm_hour)     & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT;
  82        time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK)  << MVRTC_DAY_SFT;
  83
  84        /* date */
  85        date |= (bin2bcd(t->tm_mday)       & MVRTC_DATE_MSK) << MVRTC_DATE_SFT;
  86        date |= (bin2bcd(t->tm_mon)        & MVRTC_MON_MSK)  << MVRTC_MON_SFT;
  87        date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT;
  88
  89        /* write the time register */
  90        writel(time, &regs->time);
  91
  92        /* write the date register */
  93        writel(date, &regs->date);
  94
  95        return 0;
  96}
  97
  98#ifndef CONFIG_DM_RTC
  99int rtc_set(struct rtc_time *t)
 100{
 101        struct mvrtc_registers *regs;
 102
 103        regs = (struct mvrtc_registers *)KW_RTC_BASE;
 104        return __mv_rtc_set(regs, t);
 105}
 106#endif /* !CONFIG_DM_RTC */
 107
 108static void __mv_rtc_reset(struct mvrtc_registers *regs)
 109{
 110        u32 time;
 111        u32 sec;
 112
 113        /* no init routine for this RTC needed, just check that it's working */
 114        time = readl(&regs->time);
 115        sec  = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
 116        udelay(1000000);
 117        time = readl(&regs->time);
 118
 119        if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK))
 120                printf("Error: RTC did not increment.\n");
 121}
 122
 123#ifndef CONFIG_DM_RTC
 124void rtc_reset(void)
 125{
 126        struct mvrtc_registers *regs;
 127
 128        regs = (struct mvrtc_registers *)KW_RTC_BASE;
 129        __mv_rtc_reset(regs);
 130}
 131#endif /* !CONFIG_DM_RTC */
 132
 133#ifdef CONFIG_DM_RTC
 134static int mv_rtc_get(struct udevice *dev, struct rtc_time *tm)
 135{
 136        struct mvrtc_pdata *pdata = dev_get_plat(dev);
 137        struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase;
 138
 139        return __mv_rtc_get(regs, tm);
 140}
 141
 142static int mv_rtc_set(struct udevice *dev, const struct rtc_time *tm)
 143{
 144        struct mvrtc_pdata *pdata = dev_get_plat(dev);
 145        struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase;
 146
 147        return __mv_rtc_set(regs, tm);
 148}
 149
 150static int mv_rtc_reset(struct udevice *dev)
 151{
 152        struct mvrtc_pdata *pdata = dev_get_plat(dev);
 153        struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase;
 154
 155        __mv_rtc_reset(regs);
 156        return 0;
 157}
 158
 159static const struct rtc_ops mv_rtc_ops = {
 160        .get = mv_rtc_get,
 161        .set = mv_rtc_set,
 162        .reset = mv_rtc_reset,
 163};
 164
 165static const struct udevice_id mv_rtc_ids[] = {
 166        { .compatible = "marvell,kirkwood-rtc" },
 167        { .compatible = "marvell,orion-rtc" },
 168        { }
 169};
 170
 171static int mv_rtc_of_to_plat(struct udevice *dev)
 172{
 173        struct mvrtc_pdata *pdata = dev_get_plat(dev);
 174
 175        pdata->iobase = dev_read_addr(dev);
 176        return 0;
 177}
 178
 179U_BOOT_DRIVER(rtc_mv) = {
 180        .name   = "rtc-mv",
 181        .id     = UCLASS_RTC,
 182        .of_to_plat = mv_rtc_of_to_plat,
 183        .of_match = mv_rtc_ids,
 184        .ops    = &mv_rtc_ops,
 185};
 186#endif /* CONFIG_DM_RTC */
 187