diff options
Diffstat (limited to 'arch/sh/boards/mach-sh03/rtc.c')
| -rw-r--r-- | arch/sh/boards/mach-sh03/rtc.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/arch/sh/boards/mach-sh03/rtc.c b/arch/sh/boards/mach-sh03/rtc.c new file mode 100644 index 000000000..7fb474844 --- /dev/null +++ b/arch/sh/boards/mach-sh03/rtc.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/arch/sh/boards/sh03/rtc.c -- CTP/PCI-SH03 on-chip RTC support + * + * Copyright (C) 2004 Saito.K & Jeanne(ksaito@interface.co.jp) + * + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/time.h> +#include <linux/bcd.h> +#include <linux/spinlock.h> +#include <linux/io.h> +#include <linux/rtc.h> +#include <linux/platform_device.h> + +#define RTC_BASE 0xb0000000 +#define RTC_SEC1 (RTC_BASE + 0) +#define RTC_SEC10 (RTC_BASE + 1) +#define RTC_MIN1 (RTC_BASE + 2) +#define RTC_MIN10 (RTC_BASE + 3) +#define RTC_HOU1 (RTC_BASE + 4) +#define RTC_HOU10 (RTC_BASE + 5) +#define RTC_WEE1 (RTC_BASE + 6) +#define RTC_DAY1 (RTC_BASE + 7) +#define RTC_DAY10 (RTC_BASE + 8) +#define RTC_MON1 (RTC_BASE + 9) +#define RTC_MON10 (RTC_BASE + 10) +#define RTC_YEA1 (RTC_BASE + 11) +#define RTC_YEA10 (RTC_BASE + 12) +#define RTC_YEA100 (RTC_BASE + 13) +#define RTC_YEA1000 (RTC_BASE + 14) +#define RTC_CTL (RTC_BASE + 15) +#define RTC_BUSY 1 +#define RTC_STOP 2 + +static DEFINE_SPINLOCK(sh03_rtc_lock); + +static int sh03_rtc_gettimeofday(struct device *dev, struct rtc_time *tm) +{ + unsigned int year, mon, day, hour, min, sec; + + spin_lock(&sh03_rtc_lock); + again: + do { + sec = (__raw_readb(RTC_SEC1) & 0xf) + (__raw_readb(RTC_SEC10) & 0x7) * 10; + min = (__raw_readb(RTC_MIN1) & 0xf) + (__raw_readb(RTC_MIN10) & 0xf) * 10; + hour = (__raw_readb(RTC_HOU1) & 0xf) + (__raw_readb(RTC_HOU10) & 0xf) * 10; + day = (__raw_readb(RTC_DAY1) & 0xf) + (__raw_readb(RTC_DAY10) & 0xf) * 10; + mon = (__raw_readb(RTC_MON1) & 0xf) + (__raw_readb(RTC_MON10) & 0xf) * 10; + year = (__raw_readb(RTC_YEA1) & 0xf) + (__raw_readb(RTC_YEA10) & 0xf) * 10 + + (__raw_readb(RTC_YEA100 ) & 0xf) * 100 + + (__raw_readb(RTC_YEA1000) & 0xf) * 1000; + } while (sec != (__raw_readb(RTC_SEC1) & 0xf) + (__raw_readb(RTC_SEC10) & 0x7) * 10); + if (year == 0 || mon < 1 || mon > 12 || day > 31 || day < 1 || + hour > 23 || min > 59 || sec > 59) { + printk(KERN_ERR + "SH-03 RTC: invalid value, resetting to 1 Jan 2000\n"); + printk("year=%d, mon=%d, day=%d, hour=%d, min=%d, sec=%d\n", + year, mon, day, hour, min, sec); + + __raw_writeb(0, RTC_SEC1); __raw_writeb(0, RTC_SEC10); + __raw_writeb(0, RTC_MIN1); __raw_writeb(0, RTC_MIN10); + __raw_writeb(0, RTC_HOU1); __raw_writeb(0, RTC_HOU10); + __raw_writeb(6, RTC_WEE1); + __raw_writeb(1, RTC_DAY1); __raw_writeb(0, RTC_DAY10); + __raw_writeb(1, RTC_MON1); __raw_writeb(0, RTC_MON10); + __raw_writeb(0, RTC_YEA1); __raw_writeb(0, RTC_YEA10); + __raw_writeb(0, RTC_YEA100); + __raw_writeb(2, RTC_YEA1000); + __raw_writeb(0, RTC_CTL); + goto again; + } + + spin_unlock(&sh03_rtc_lock); + + tm->tm_sec = sec; + tm->tm_min = min; + tm->tm_hour = hour; + tm->tm_mday = day; + tm->tm_mon = mon; + tm->tm_year = year - 1900; + + return 0; +} + +static int set_rtc_mmss(struct rtc_time *tm) +{ + int retval = 0; + int real_seconds, real_minutes, cmos_minutes; + int i; + + /* gets recalled with irq locally disabled */ + spin_lock(&sh03_rtc_lock); + for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */ + if (!(__raw_readb(RTC_CTL) & RTC_BUSY)) + break; + cmos_minutes = (__raw_readb(RTC_MIN1) & 0xf) + (__raw_readb(RTC_MIN10) & 0xf) * 10; + real_seconds = tm->tm_sec; + real_minutes = tm->tm_min; + if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1) + real_minutes += 30; /* correct for half hour time zone */ + real_minutes %= 60; + + if (abs(real_minutes - cmos_minutes) < 30) { + __raw_writeb(real_seconds % 10, RTC_SEC1); + __raw_writeb(real_seconds / 10, RTC_SEC10); + __raw_writeb(real_minutes % 10, RTC_MIN1); + __raw_writeb(real_minutes / 10, RTC_MIN10); + } else { + printk_once(KERN_NOTICE + "set_rtc_mmss: can't update from %d to %d\n", + cmos_minutes, real_minutes); + retval = -EINVAL; + } + spin_unlock(&sh03_rtc_lock); + + return retval; +} + +int sh03_rtc_settimeofday(struct device *dev, struct rtc_time *tm) +{ + return set_rtc_mmss(tm); +} + +static const struct rtc_class_ops rtc_generic_ops = { + .read_time = sh03_rtc_gettimeofday, + .set_time = sh03_rtc_settimeofday, +}; + +static int __init sh03_time_init(void) +{ + struct platform_device *pdev; + + pdev = platform_device_register_data(NULL, "rtc-generic", -1, + &rtc_generic_ops, + sizeof(rtc_generic_ops)); + + return PTR_ERR_OR_ZERO(pdev); +} +arch_initcall(sh03_time_init); |