Add ARM AMBA PL031 RTC Support

Signed-off-by: Gururaja Hebbar K R <gururajakr@sanyo.co.in>

diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 2af3ee5cfe52a12cde5da38138924d5a4cda0238..07c12fa155ec6242b4454cd10a32d9d701077d44 100644 (file)
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -52,6 +52,7 @@ COBJS-$(CONFIG_RTC_MK48T59) += mk48t59.o
 COBJS-$(CONFIG_RTC_MPC5200) += mpc5xxx.o
 COBJS-$(CONFIG_RTC_MPC8xx) += mpc8xx.o
 COBJS-$(CONFIG_RTC_PCF8563) += pcf8563.o
+COBJS-$(CONFIG_RTC_PL031) += pl031.o
 COBJS-$(CONFIG_RTC_RS5C372A) += rs5c372.o
 COBJS-$(CONFIG_RTC_RX8025) += rx8025.o
 COBJS-$(CONFIG_RTC_S3C24X0) += s3c24x0_rtc.o

diff --git a/drivers/rtc/pl031.c b/drivers/rtc/pl031.c
new file mode 100755 (executable)
index 0000000..276c184
--- /dev/null
+++ b/drivers/rtc/pl031.c
@@ -0,0 +1,123 @@
+/*
+ * (C) Copyright 2008
+ * Gururaja Hebbar gururajakr@sanyo.co.in
+ *
+ * reference linux-2.6.20.6/drivers/rtc/rtc-pl031.c
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <command.h>
+#include <rtc.h>
+
+#if defined(CONFIG_CMD_DATE)
+
+#ifndef CFG_RTC_PL031_BASE
+#error CFG_RTC_PL031_BASE is not defined!
+#endif
+
+/*
+ * 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)
+
+#define        RTC_WRITE_REG(addr, val) \
+                       (*(volatile unsigned int *)(CFG_RTC_PL031_BASE + (addr)) = (val))
+#define        RTC_READ_REG(addr)      \
+                       (*(volatile unsigned int *)(CFG_RTC_PL031_BASE + (addr)))
+
+static int pl031_initted = 0;
+
+/* Enable RTC Start in Control register*/
+void rtc_init(void)
+{
+       RTC_WRITE_REG(RTC_CR, RTC_CR_START);
+
+       pl031_initted = 1;
+}
+
+/*
+ * Reset the RTC. We set the date back to 1970-01-01.
+ */
+void rtc_reset(void)
+{
+       RTC_WRITE_REG(RTC_LR, 0x00);
+       if(!pl031_initted)
+               rtc_init();
+}
+
+/*
+ * Set the RTC
+*/
+void rtc_set(struct rtc_time *tmp)
+{
+       unsigned long tim;
+
+       if(!pl031_initted)
+               rtc_init();
+
+       if (tmp == NULL) {
+               puts("Error setting the date/time\n");
+               return;
+       }
+
+       /* Calculate number of seconds this incoming time represents */
+       tim = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday,
+                       tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+
+       RTC_WRITE_REG(RTC_LR, tim);
+}
+
+/*
+ * Get the current time from the RTC
+ */
+int rtc_get(struct rtc_time *tmp)
+{
+       ulong tim;
+
+       if(!pl031_initted)
+               rtc_init();
+
+       if (tmp == NULL) {
+               puts("Error getting the date/time\n");
+               return -1;
+       }
+
+       tim = RTC_READ_REG(RTC_DR);
+
+       to_tm (tim, tmp);
+
+       debug ( "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);
+
+       return 0;
+}
+
+#endif