143 lines
2.8 KiB
C
143 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2008
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* Gururaja Hebbar gururajakr@sanyo.co.in
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*
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* reference linux-2.6.20.6/drivers/rtc/rtc-pl031.c
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*/
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <errno.h>
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#include <log.h>
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#include <rtc.h>
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#include <asm/io.h>
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#include <asm/types.h>
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/*
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* Register definitions
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*/
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#define RTC_DR 0x00 /* Data read register */
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#define RTC_MR 0x04 /* Match register */
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#define RTC_LR 0x08 /* Data load register */
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#define RTC_CR 0x0c /* Control register */
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#define RTC_IMSC 0x10 /* Interrupt mask and set register */
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#define RTC_RIS 0x14 /* Raw interrupt status register */
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#define RTC_MIS 0x18 /* Masked interrupt status register */
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#define RTC_ICR 0x1c /* Interrupt clear register */
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#define RTC_CR_START (1 << 0)
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struct pl031_plat {
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phys_addr_t base;
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};
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static inline u32 pl031_read_reg(struct udevice *dev, int reg)
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{
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struct pl031_plat *pdata = dev_get_plat(dev);
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return readl(pdata->base + reg);
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}
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static inline u32 pl031_write_reg(struct udevice *dev, int reg, u32 value)
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{
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struct pl031_plat *pdata = dev_get_plat(dev);
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return writel(value, pdata->base + reg);
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}
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/*
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* Probe RTC device
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*/
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static int pl031_probe(struct udevice *dev)
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{
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/* Enable RTC Start in Control register*/
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pl031_write_reg(dev, RTC_CR, RTC_CR_START);
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return 0;
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}
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/*
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* Get the current time from the RTC
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*/
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static int pl031_get(struct udevice *dev, struct rtc_time *tm)
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{
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unsigned long tim;
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if (!tm)
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return -EINVAL;
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tim = pl031_read_reg(dev, RTC_DR);
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rtc_to_tm(tim, tm);
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debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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return 0;
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}
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/*
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* Set the RTC
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*/
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static int pl031_set(struct udevice *dev, const struct rtc_time *tm)
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{
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unsigned long tim;
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if (!tm)
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return -EINVAL;
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debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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/* Calculate number of seconds this incoming time represents */
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tim = rtc_mktime(tm);
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pl031_write_reg(dev, RTC_LR, tim);
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return 0;
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}
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/*
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* Reset the RTC. We set the date back to 1970-01-01.
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*/
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static int pl031_reset(struct udevice *dev)
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{
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pl031_write_reg(dev, RTC_LR, 0);
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return 0;
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}
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static const struct rtc_ops pl031_ops = {
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.get = pl031_get,
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.set = pl031_set,
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.reset = pl031_reset,
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};
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static const struct udevice_id pl031_ids[] = {
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{ .compatible = "arm,pl031" },
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{ }
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};
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static int pl031_of_to_plat(struct udevice *dev)
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{
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struct pl031_plat *pdata = dev_get_plat(dev);
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pdata->base = dev_read_addr(dev);
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return 0;
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}
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U_BOOT_DRIVER(rtc_pl031) = {
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.name = "rtc-pl031",
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.id = UCLASS_RTC,
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.of_match = pl031_ids,
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.probe = pl031_probe,
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.of_to_plat = pl031_of_to_plat,
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.plat_auto = sizeof(struct pl031_plat),
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.ops = &pl031_ops,
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};
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