Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / drivers / rtc / m41t62.c

diff --git a/qemu/roms/u-boot/drivers/rtc/m41t62.c b/qemu/roms/u-boot/drivers/rtc/m41t62.c
new file mode 100644 (file)
index 0000000..3829bc5
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/rtc/m41t62.c
@@ -0,0 +1,135 @@
+/*
+ * (C) Copyright 2008
+ * Stefan Roese, DENX Software Engineering, sr@denx.de.
+ *
+ * based on a the Linux rtc-m41t80.c driver which is:
+ *   Alexander Bigga <ab@mycable.de>, 2006 (c) mycable GmbH
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+/*
+ * Date & Time support for STMicroelectronics M41T62
+ */
+
+/* #define     DEBUG   */
+
+#include <common.h>
+#include <command.h>
+#include <rtc.h>
+#include <i2c.h>
+
+#if defined(CONFIG_CMD_DATE)
+
+#define M41T62_REG_SSEC        0
+#define M41T62_REG_SEC 1
+#define M41T62_REG_MIN 2
+#define M41T62_REG_HOUR        3
+#define M41T62_REG_WDAY        4
+#define M41T62_REG_DAY 5
+#define M41T62_REG_MON 6
+#define M41T62_REG_YEAR        7
+#define M41T62_REG_ALARM_MON   0xa
+#define M41T62_REG_ALARM_DAY   0xb
+#define M41T62_REG_ALARM_HOUR  0xc
+#define M41T62_REG_ALARM_MIN   0xd
+#define M41T62_REG_ALARM_SEC   0xe
+#define M41T62_REG_FLAGS       0xf
+
+#define M41T62_DATETIME_REG_SIZE       (M41T62_REG_YEAR + 1)
+#define M41T62_ALARM_REG_SIZE  \
+       (M41T62_REG_ALARM_SEC + 1 - M41T62_REG_ALARM_MON)
+
+#define M41T62_SEC_ST          (1 << 7)        /* ST: Stop Bit */
+#define M41T62_ALMON_AFE       (1 << 7)        /* AFE: AF Enable Bit */
+#define M41T62_ALMON_SQWE      (1 << 6)        /* SQWE: SQW Enable Bit */
+#define M41T62_ALHOUR_HT       (1 << 6)        /* HT: Halt Update Bit */
+#define M41T62_FLAGS_AF                (1 << 6)        /* AF: Alarm Flag Bit */
+#define M41T62_FLAGS_BATT_LOW  (1 << 4)        /* BL: Battery Low Bit */
+
+#define M41T62_FEATURE_HT      (1 << 0)
+#define M41T62_FEATURE_BL      (1 << 1)
+
+#define M41T80_ALHOUR_HT       (1 << 6)        /* HT: Halt Update Bit */
+
+int rtc_get(struct rtc_time *tm)
+{
+       u8 buf[M41T62_DATETIME_REG_SIZE];
+
+       i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE);
+
+       debug("%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
+             "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
+             __FUNCTION__,
+             buf[0], buf[1], buf[2], buf[3],
+             buf[4], buf[5], buf[6], buf[7]);
+
+       tm->tm_sec = bcd2bin(buf[M41T62_REG_SEC] & 0x7f);
+       tm->tm_min = bcd2bin(buf[M41T62_REG_MIN] & 0x7f);
+       tm->tm_hour = bcd2bin(buf[M41T62_REG_HOUR] & 0x3f);
+       tm->tm_mday = bcd2bin(buf[M41T62_REG_DAY] & 0x3f);
+       tm->tm_wday = buf[M41T62_REG_WDAY] & 0x07;
+       tm->tm_mon = bcd2bin(buf[M41T62_REG_MON] & 0x1f);
+
+       /* assume 20YY not 19YY, and ignore the Century Bit */
+       /* U-Boot needs to add 1900 here */
+       tm->tm_year = bcd2bin(buf[M41T62_REG_YEAR]) + 100 + 1900;
+
+       debug("%s: tm is secs=%d, mins=%d, hours=%d, "
+             "mday=%d, mon=%d, year=%d, wday=%d\n",
+             __FUNCTION__,
+             tm->tm_sec, tm->tm_min, tm->tm_hour,
+             tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
+
+       return 0;
+}
+
+int rtc_set(struct rtc_time *tm)
+{
+       u8 buf[M41T62_DATETIME_REG_SIZE];
+
+       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);
+
+       i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE);
+
+       /* Merge time-data and register flags into buf[0..7] */
+       buf[M41T62_REG_SSEC] = 0;
+       buf[M41T62_REG_SEC] =
+               bin2bcd(tm->tm_sec) | (buf[M41T62_REG_SEC] & ~0x7f);
+       buf[M41T62_REG_MIN] =
+               bin2bcd(tm->tm_min) | (buf[M41T62_REG_MIN] & ~0x7f);
+       buf[M41T62_REG_HOUR] =
+               bin2bcd(tm->tm_hour) | (buf[M41T62_REG_HOUR] & ~0x3f) ;
+       buf[M41T62_REG_WDAY] =
+               (tm->tm_wday & 0x07) | (buf[M41T62_REG_WDAY] & ~0x07);
+       buf[M41T62_REG_DAY] =
+               bin2bcd(tm->tm_mday) | (buf[M41T62_REG_DAY] & ~0x3f);
+       buf[M41T62_REG_MON] =
+               bin2bcd(tm->tm_mon) | (buf[M41T62_REG_MON] & ~0x1f);
+       /* assume 20YY not 19YY */
+       buf[M41T62_REG_YEAR] = bin2bcd(tm->tm_year % 100);
+
+       if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE)) {
+               printf("I2C write failed in %s()\n", __func__);
+               return -1;
+       }
+
+       return 0;
+}
+
+void rtc_reset(void)
+{
+       u8 val;
+
+       /*
+        * M41T82: Make sure HT (Halt Update) bit is cleared.
+        * This bit is 0 in M41T62 so its save to clear it always.
+        */
+       i2c_read(CONFIG_SYS_I2C_RTC_ADDR, M41T62_REG_ALARM_HOUR, 1, &val, 1);
+       val &= ~M41T80_ALHOUR_HT;
+       i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T62_REG_ALARM_HOUR, 1, &val, 1);
+}
+
+#endif