pl031.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2008
* Gururaja Hebbar gururajakr@sanyo.co.in
*
* reference linux-2.6.20.6/drivers/rtc/rtc-pl031.c
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <errno.h>
#include <rtc.h>
#include <asm/io.h>
#include <asm/types.h>
/*
* Register definitions
*/
#define RTC_DR 0x00 /* Data read register */
#define RTC_MR 0x04 /* Match register */
#define RTC_LR 0x08 /* Data load register */
#define RTC_CR 0x0c /* Control register */
#define RTC_IMSC 0x10 /* Interrupt mask and set register */
#define RTC_RIS 0x14 /* Raw interrupt status register */
#define RTC_MIS 0x18 /* Masked interrupt status register */
#define RTC_ICR 0x1c /* Interrupt clear register */
#define RTC_CR_START (1 << 0)
struct pl031_platdata {
phys_addr_t base;
};
static inline u32 pl031_read_reg(struct udevice *dev, int reg)
{
struct pl031_platdata *pdata = dev_get_platdata(dev);
return readl(pdata->base + reg);
}
static inline u32 pl031_write_reg(struct udevice *dev, int reg, u32 value)
{
struct pl031_platdata *pdata = dev_get_platdata(dev);
return writel(value, pdata->base + reg);
}
/*
* Probe RTC device
*/
static int pl031_probe(struct udevice *dev)
{
/* Enable RTC Start in Control register*/
pl031_write_reg(dev, RTC_CR, RTC_CR_START);
return 0;
}
/*
* Get the current time from the RTC
*/
static int pl031_get(struct udevice *dev, struct rtc_time *tm)
{
unsigned long tim;
if (!tm)
return -EINVAL;
tim = pl031_read_reg(dev, RTC_DR);
rtc_to_tm(tim, tm);
debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
return 0;
}
/*
* Set the RTC
*/
static int pl031_set(struct udevice *dev, const struct rtc_time *tm)
{
unsigned long tim;
if (!tm)
return -EINVAL;
debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
/* Calculate number of seconds this incoming time represents */
tim = rtc_mktime(tm);
pl031_write_reg(dev, RTC_LR, tim);
return 0;
}
/*
* Reset the RTC. We set the date back to 1970-01-01.
*/
static int pl031_reset(struct udevice *dev)
{
pl031_write_reg(dev, RTC_LR, 0);
return 0;
}
static const struct rtc_ops pl031_ops = {
.get = pl031_get,
.set = pl031_set,
.reset = pl031_reset,
};
static const struct udevice_id pl031_ids[] = {
{ .compatible = "arm,pl031" },
{ }
};
static int pl031_ofdata_to_platdata(struct udevice *dev)
{
struct pl031_platdata *pdata = dev_get_platdata(dev);
pdata->base = dev_read_addr(dev);
return 0;
}
U_BOOT_DRIVER(rtc_pl031) = {
.name = "rtc-pl031",
.id = UCLASS_RTC,
.of_match = pl031_ids,
.probe = pl031_probe,
.ofdata_to_platdata = pl031_ofdata_to_platdata,
.platdata_auto_alloc_size = sizeof(struct pl031_platdata),
.ops = &pl031_ops,
};