* (C) Copyright 2001
* Denis Peter MPL AG Switzerland. d.peter@mpl.ch
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
/*
* Date & Time support for the MC146818 (PIXX4) RTC
*/
-/*#define DEBUG*/
-
#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)
-static uchar rtc_read (uchar reg);
-static void rtc_write (uchar reg, uchar val);
-static uchar bin2bcd (unsigned int n);
-static unsigned bcd2bin(uchar c);
+/* Set this to 1 to clear the CMOS RAM */
+#define CLEAR_CMOS 0
-#define RTC_PORT_MC146818 CFG_ISA_IO_BASE_ADDRESS + 0x70
+#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_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_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
-int rtc_get (struct rtc_time *tmp)
+static int mc146818_read8(int reg)
{
- uchar sec, min, hour, mday, wday, mon, year;
- /* here check if rtc can be accessed */
- while((rtc_read(RTC_CONFIG_A)&0x80)==0x80);
- sec = rtc_read (RTC_SECONDS);
- min = rtc_read (RTC_MINUTES);
- hour = rtc_read (RTC_HOURS);
- mday = rtc_read (RTC_DATE_OF_MONTH);
- wday = rtc_read (RTC_DAY_OF_WEEK);
- mon = rtc_read (RTC_MONTH);
- year = rtc_read (RTC_YEAR);
-#ifdef CONFIG_AMIGAONEG3SE
- wday -= 1; /* VIA 686 stores Sunday = 1, Monday = 2, ... */
+#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: month: %02x hour: %02x min: %02x sec: %02x\n",
- rtc_read (RTC_CONFIG_D) & 0x3F,
- rtc_read (RTC_HOURS_ALARM),
- rtc_read (RTC_MINUTES_ALARM),
- rtc_read (RTC_SECONDS_ALARM) );
+ 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: month: %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;
+ 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_year += 1900;
+
tmp->tm_yday = 0;
- tmp->tm_isdst= 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);
+ 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;
}
-void rtc_set (struct rtc_time *tmp)
+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);
+ 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
- rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
+ /* Disable the RTC to update the regs */
+ mc146818_write8(RTC_CONFIG_B, 0x82);
- rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
- rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
-#ifdef CONFIG_AMIGAONEG3SE
- rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)+1);
-#else
- rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
+ 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
- rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
- rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour));
- rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min ));
- rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec ));
- rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
+ /* 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
-void rtc_reset (void)
+static int rtc_mc146818_get(struct udevice *dev, struct rtc_time *time)
{
- rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
- rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */
- rtc_write(RTC_CONFIG_B,0x00);
- rtc_write(RTC_CONFIG_B,0x00);
- rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
+ return mc146818_get(time);
}
-/* ------------------------------------------------------------------------- */
+static int rtc_mc146818_set(struct udevice *dev, const struct rtc_time *time)
+{
+ return mc146818_set((struct rtc_time *)time);
+}
-#ifdef CFG_RTC_REG_BASE_ADDR
-/*
- * use direct memory access
- */
-static uchar rtc_read (uchar reg)
+static int rtc_mc146818_reset(struct udevice *dev)
{
- return(in8(CFG_RTC_REG_BASE_ADDR+reg));
+ mc146818_reset();
+
+ return 0;
}
-static void rtc_write (uchar reg, uchar val)
+static int rtc_mc146818_read8(struct udevice *dev, unsigned int reg)
{
- out8(CFG_RTC_REG_BASE_ADDR+reg, val);
+ return mc146818_read8(reg);
}
-#else
-static uchar rtc_read (uchar reg)
+
+static int rtc_mc146818_write8(struct udevice *dev, unsigned int reg, int val)
{
- out8(RTC_PORT_MC146818,reg);
- return(in8(RTC_PORT_MC146818+1));
+ mc146818_write8(reg, val);
+
+ return 0;
}
-static void rtc_write (uchar reg, uchar val)
+static int rtc_mc146818_probe(struct udevice *dev)
{
- out8(RTC_PORT_MC146818,reg);
- out8(RTC_PORT_MC146818+1,val);
+ mc146818_init();
+
+ return 0;
}
-#endif
-static unsigned bcd2bin (uchar n)
+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 ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
+ return mc146818_get(tmp);
}
-static unsigned char bin2bcd (unsigned int n)
+int rtc_set(struct rtc_time *tmp)
{
- return (((n / 10) << 4) | (n % 10));
+ return mc146818_set(tmp);
}
-#endif
+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 */
git.openpandora.org / pandora-u-boot.git / blobdiff