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u-boot/drivers/rtc/mc146818.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

306 lines
6.6 KiB
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2001
* Denis Peter MPL AG Switzerland. d.peter@mpl.ch
*/
/*
* Date & Time support for the MC146818 (PIXX4) RTC
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <rtc.h>
#if defined(CONFIG_X86) || defined(CONFIG_MALTA)
#include <asm/io.h>
#define in8(p) inb(p)
#define out8(p, v) outb(v, p)
#endif
#if defined(CONFIG_CMD_DATE)
/* Set this to 1 to clear the CMOS RAM */
#define CLEAR_CMOS 0
#define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70
#define RTC_SECONDS 0x00
#define RTC_SECONDS_ALARM 0x01
#define RTC_MINUTES 0x02
#define RTC_MINUTES_ALARM 0x03
#define RTC_HOURS 0x04
#define RTC_HOURS_ALARM 0x05
#define RTC_DAY_OF_WEEK 0x06
#define RTC_DATE_OF_MONTH 0x07
#define RTC_MONTH 0x08
#define RTC_YEAR 0x09
#define RTC_CONFIG_A 0x0a
#define RTC_CONFIG_B 0x0b
#define RTC_CONFIG_C 0x0c
#define RTC_CONFIG_D 0x0d
#define RTC_REG_SIZE 0x80
#define RTC_CONFIG_A_REF_CLCK_32KHZ (1 << 5)
#define RTC_CONFIG_A_RATE_1024HZ 6
#define RTC_CONFIG_B_24H (1 << 1)
#define RTC_CONFIG_D_VALID_RAM_AND_TIME 0x80
static int mc146818_read8(int reg)
{
#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
return in8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg);
#else
int ofs = 0;
if (reg >= 128) {
ofs = 2;
reg -= 128;
}
out8(RTC_PORT_MC146818 + ofs, reg);
return in8(RTC_PORT_MC146818 + ofs + 1);
#endif
}
static void mc146818_write8(int reg, uchar val)
{
#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
out8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg, val);
#else
int ofs = 0;
if (reg >= 128) {
ofs = 2;
reg -= 128;
}
out8(RTC_PORT_MC146818 + ofs, reg);
out8(RTC_PORT_MC146818 + ofs + 1, val);
#endif
}
static int mc146818_get(struct rtc_time *tmp)
{
uchar sec, min, hour, mday, wday, mon, year;
/* here check if rtc can be accessed */
while ((mc146818_read8(RTC_CONFIG_A) & 0x80) == 0x80)
;
sec = mc146818_read8(RTC_SECONDS);
min = mc146818_read8(RTC_MINUTES);
hour = mc146818_read8(RTC_HOURS);
mday = mc146818_read8(RTC_DATE_OF_MONTH);
wday = mc146818_read8(RTC_DAY_OF_WEEK);
mon = mc146818_read8(RTC_MONTH);
year = mc146818_read8(RTC_YEAR);
#ifdef RTC_DEBUG
printf("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x hr: %02x min: %02x sec: %02x\n",
year, mon, mday, wday, hour, min, sec);
printf("Alarms: mday: %02x hour: %02x min: %02x sec: %02x\n",
mc146818_read8(RTC_CONFIG_D) & 0x3f,
mc146818_read8(RTC_HOURS_ALARM),
mc146818_read8(RTC_MINUTES_ALARM),
mc146818_read8(RTC_SECONDS_ALARM));
#endif
tmp->tm_sec = bcd2bin(sec & 0x7f);
tmp->tm_min = bcd2bin(min & 0x7f);
tmp->tm_hour = bcd2bin(hour & 0x3f);
tmp->tm_mday = bcd2bin(mday & 0x3f);
tmp->tm_mon = bcd2bin(mon & 0x1f);
tmp->tm_year = bcd2bin(year);
tmp->tm_wday = bcd2bin(wday & 0x07);
if (tmp->tm_year < 70)
tmp->tm_year += 2000;
else
tmp->tm_year += 1900;
tmp->tm_yday = 0;
tmp->tm_isdst = 0;
#ifdef RTC_DEBUG
printf("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
#endif
return 0;
}
static int mc146818_set(struct rtc_time *tmp)
{
#ifdef RTC_DEBUG
printf("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
#endif
/* Disable the RTC to update the regs */
mc146818_write8(RTC_CONFIG_B, 0x82);
mc146818_write8(RTC_YEAR, bin2bcd(tmp->tm_year % 100));
mc146818_write8(RTC_MONTH, bin2bcd(tmp->tm_mon));
mc146818_write8(RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
mc146818_write8(RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
mc146818_write8(RTC_HOURS, bin2bcd(tmp->tm_hour));
mc146818_write8(RTC_MINUTES, bin2bcd(tmp->tm_min));
mc146818_write8(RTC_SECONDS, bin2bcd(tmp->tm_sec));
/* Enable the RTC to update the regs */
mc146818_write8(RTC_CONFIG_B, 0x02);
return 0;
}
static void mc146818_reset(void)
{
/* Disable the RTC to update the regs */
mc146818_write8(RTC_CONFIG_B, 0x82);
/* Normal OP */
mc146818_write8(RTC_CONFIG_A, 0x20);
mc146818_write8(RTC_CONFIG_B, 0x00);
mc146818_write8(RTC_CONFIG_B, 0x00);
/* Enable the RTC to update the regs */
mc146818_write8(RTC_CONFIG_B, 0x02);
}
static void mc146818_init(void)
{
#if CLEAR_CMOS
int i;
rtc_write8(RTC_SECONDS_ALARM, 0);
rtc_write8(RTC_MINUTES_ALARM, 0);
rtc_write8(RTC_HOURS_ALARM, 0);
for (i = RTC_CONFIG_A; i < RTC_REG_SIZE; i++)
rtc_write8(i, 0);
printf("RTC: zeroing CMOS RAM\n");
#endif
/* Setup the real time clock */
mc146818_write8(RTC_CONFIG_B, RTC_CONFIG_B_24H);
/* Setup the frequency it operates at */
mc146818_write8(RTC_CONFIG_A, RTC_CONFIG_A_REF_CLCK_32KHZ |
RTC_CONFIG_A_RATE_1024HZ);
/* Ensure all reserved bits are 0 in register D */
mc146818_write8(RTC_CONFIG_D, RTC_CONFIG_D_VALID_RAM_AND_TIME);
/* Clear any pending interrupts */
mc146818_read8(RTC_CONFIG_C);
}
#endif /* CONFIG_CMD_DATE */
#ifdef CONFIG_DM_RTC
static int rtc_mc146818_get(struct udevice *dev, struct rtc_time *time)
{
return mc146818_get(time);
}
static int rtc_mc146818_set(struct udevice *dev, const struct rtc_time *time)
{
return mc146818_set((struct rtc_time *)time);
}
static int rtc_mc146818_reset(struct udevice *dev)
{
mc146818_reset();
return 0;
}
static int rtc_mc146818_read8(struct udevice *dev, unsigned int reg)
{
return mc146818_read8(reg);
}
static int rtc_mc146818_write8(struct udevice *dev, unsigned int reg, int val)
{
mc146818_write8(reg, val);
return 0;
}
static int rtc_mc146818_probe(struct udevice *dev)
{
mc146818_init();
return 0;
}
static const struct rtc_ops rtc_mc146818_ops = {
.get = rtc_mc146818_get,
.set = rtc_mc146818_set,
.reset = rtc_mc146818_reset,
.read8 = rtc_mc146818_read8,
.write8 = rtc_mc146818_write8,
};
static const struct udevice_id rtc_mc146818_ids[] = {
{ .compatible = "motorola,mc146818" },
{ }
};
U_BOOT_DRIVER(rtc_mc146818) = {
.name = "rtc_mc146818",
.id = UCLASS_RTC,
.of_match = rtc_mc146818_ids,
.probe = rtc_mc146818_probe,
.ops = &rtc_mc146818_ops,
};
#else /* !CONFIG_DM_RTC */
int rtc_get(struct rtc_time *tmp)
{
return mc146818_get(tmp);
}
int rtc_set(struct rtc_time *tmp)
{
return mc146818_set(tmp);
}
void rtc_reset(void)
{
mc146818_reset();
}
int rtc_read8(int reg)
{
return mc146818_read8(reg);
}
void rtc_write8(int reg, uchar val)
{
mc146818_write8(reg, val);
}
u32 rtc_read32(int reg)
{
u32 value = 0;
int i;
for (i = 0; i < sizeof(value); i++)
value |= rtc_read8(reg + i) << (i << 3);
return value;
}
void rtc_write32(int reg, u32 value)
{
int i;
for (i = 0; i < sizeof(value); i++)
rtc_write8(reg + i, (value >> (i << 3)) & 0xff);
}
void rtc_init(void)
{
mc146818_init();
}
#endif /* CONFIG_DM_RTC */
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