diff options
Diffstat (limited to 'roms/u-boot/drivers/rtc/mvrtc.c')
| -rw-r--r-- | roms/u-boot/drivers/rtc/mvrtc.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/rtc/mvrtc.c b/roms/u-boot/drivers/rtc/mvrtc.c new file mode 100644 index 000000000..50240d57f --- /dev/null +++ b/roms/u-boot/drivers/rtc/mvrtc.c @@ -0,0 +1,186 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2011 + * Jason Cooper <u-boot@lakedaemon.net> + */ + +/* + * Date & Time support for Marvell Integrated RTC + */ + +#include <common.h> +#include <command.h> +#include <dm.h> +#include <rtc.h> +#include <asm/io.h> +#include <linux/delay.h> +#include "mvrtc.h" + +/* This RTC does not support century, so we assume 20 */ +#define CENTURY 20 + +static int __mv_rtc_get(struct mvrtc_registers *regs, struct rtc_time *t) +{ + u32 time; + u32 date; + + /* read the time register */ + time = readl(®s->time); + + /* read the date register */ + date = readl(®s->date); + + /* test for 12 hour clock (can't tell if it's am/pm) */ + if (time & MVRTC_HRFMT_MSK) { + printf("Error: RTC in 12 hour mode, can't determine AM/PM.\n"); + return -1; + } + + /* time */ + t->tm_sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK); + t->tm_min = bcd2bin((time >> MVRTC_MIN_SFT) & MVRTC_MIN_MSK); + t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK); + t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT) & MVRTC_DAY_MSK); + t->tm_wday--; + + /* date */ + t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK); + t->tm_mon = bcd2bin((date >> MVRTC_MON_SFT) & MVRTC_MON_MSK); + t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK); + t->tm_year += CENTURY * 100; + + /* not supported in this RTC */ + t->tm_yday = 0; + t->tm_isdst = 0; + + return 0; +} + +#ifndef CONFIG_DM_RTC +int rtc_get(struct rtc_time *t) +{ + struct mvrtc_registers *regs; + + regs = (struct mvrtc_registers *)KW_RTC_BASE; + return __mv_rtc_get(regs, t); +} +#endif /* !CONFIG_DM_RTC */ + +static int __mv_rtc_set(struct mvrtc_registers *regs, const struct rtc_time *t) +{ + u32 time = 0; /* sets hour format bit to zero, 24hr format. */ + u32 date = 0; + + /* check that this code isn't 80+ years old ;-) */ + if ((t->tm_year / 100) != CENTURY) + printf("Warning: Only century %d supported.\n", CENTURY); + + /* time */ + time |= (bin2bcd(t->tm_sec) & MVRTC_SEC_MSK) << MVRTC_SEC_SFT; + time |= (bin2bcd(t->tm_min) & MVRTC_MIN_MSK) << MVRTC_MIN_SFT; + time |= (bin2bcd(t->tm_hour) & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT; + time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK) << MVRTC_DAY_SFT; + + /* date */ + date |= (bin2bcd(t->tm_mday) & MVRTC_DATE_MSK) << MVRTC_DATE_SFT; + date |= (bin2bcd(t->tm_mon) & MVRTC_MON_MSK) << MVRTC_MON_SFT; + date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT; + + /* write the time register */ + writel(time, ®s->time); + + /* write the date register */ + writel(date, ®s->date); + + return 0; +} + +#ifndef CONFIG_DM_RTC +int rtc_set(struct rtc_time *t) +{ + struct mvrtc_registers *regs; + + regs = (struct mvrtc_registers *)KW_RTC_BASE; + return __mv_rtc_set(regs, t); +} +#endif /* !CONFIG_DM_RTC */ + +static void __mv_rtc_reset(struct mvrtc_registers *regs) +{ + u32 time; + u32 sec; + + /* no init routine for this RTC needed, just check that it's working */ + time = readl(®s->time); + sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK); + udelay(1000000); + time = readl(®s->time); + + if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK)) + printf("Error: RTC did not increment.\n"); +} + +#ifndef CONFIG_DM_RTC +void rtc_reset(void) +{ + struct mvrtc_registers *regs; + + regs = (struct mvrtc_registers *)KW_RTC_BASE; + __mv_rtc_reset(regs); +} +#endif /* !CONFIG_DM_RTC */ + +#ifdef CONFIG_DM_RTC +static int mv_rtc_get(struct udevice *dev, struct rtc_time *tm) +{ + struct mvrtc_pdata *pdata = dev_get_plat(dev); + struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase; + + return __mv_rtc_get(regs, tm); +} + +static int mv_rtc_set(struct udevice *dev, const struct rtc_time *tm) +{ + struct mvrtc_pdata *pdata = dev_get_plat(dev); + struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase; + + return __mv_rtc_set(regs, tm); +} + +static int mv_rtc_reset(struct udevice *dev) +{ + struct mvrtc_pdata *pdata = dev_get_plat(dev); + struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase; + + __mv_rtc_reset(regs); + return 0; +} + +static const struct rtc_ops mv_rtc_ops = { + .get = mv_rtc_get, + .set = mv_rtc_set, + .reset = mv_rtc_reset, +}; + +static const struct udevice_id mv_rtc_ids[] = { + { .compatible = "marvell,kirkwood-rtc" }, + { .compatible = "marvell,orion-rtc" }, + { } +}; + +static int mv_rtc_of_to_plat(struct udevice *dev) +{ + struct mvrtc_pdata *pdata = dev_get_plat(dev); + + pdata->iobase = dev_read_addr(dev); + return 0; +} + +U_BOOT_DRIVER(rtc_mv) = { + .name = "rtc-mv", + .id = UCLASS_RTC, + .of_to_plat = mv_rtc_of_to_plat, + .of_match = mv_rtc_ids, + .ops = &mv_rtc_ops, +}; +#endif /* CONFIG_DM_RTC */ |