[U-Boot-Users] [PATCH] ADD ARM AMBA PL031 RTC Support

[Hebbar <gururajakr@sanyo.co.in>]

Hi,

This patch adds support to arm amba pl031 rtc chip.
user needs to define 3 variables in board config to make use of this driver 

#define CONFIG_RTC_PL031	1			/* use ARM AMBA PL031 RTC */
#define CFG_RTC_PL031_BASE 	0x101e8000  /* RTC Registers Base Address */

and

#define 	CONFIG_CMD_DATE


Comments are welcome.

Regards
Gururaja


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

- Add support to the ARM AMBA PL031 RTC Chip.


diff -purN uboot/drivers/rtc_orig/Makefile uboot/drivers/rtc/Makefile
--- uboot/drivers/rtc_orig/Makefile	2008-05-19 03:47:11.000000000 -0700
+++ uboot/drivers/rtc/Makefile	2008-07-16 16:21:04.515625000 -0700
@@ -56,6 +56,7 @@ COBJS-y += rs5c372.o
 COBJS-y += rx8025.o
 COBJS-y += s3c24x0_rtc.o
 COBJS-y += x1205.o
+COBJS-y += rtc_pl031.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
diff -purN uboot/drivers/rtc_orig/rtc_pl031.c uboot/drivers/rtc/rtc_pl031.c
--- uboot/drivers/rtc_orig/rtc_pl031.c	1969-12-31 16:00:00.000000000 -0800
+++ uboot/drivers/rtc/rtc_pl031.c	2008-07-16 17:44:46.406250000 -0700
@@ -0,0 +1,110 @@
+/*
+ * (C) Copyright 2008
+ * Gururaja Hebbar gururajakr at 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_RTC_PL031) && 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_MIE	(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)))
+
+/*
+ * Reset the RTC. We set the date back to 1970-01-01.
+ */
+void rtc_reset(void)
+{
+	RTC_WRITE_REG(RTC_LR,0x00);
+}
+
+/* Enable RTC Start in Control register*/
+int rtc_init(void)
+{
+	RTC_WRITE_REG(RTC_CR,RTC_CR_MIE);
+	return 0;
+}
+
+/*
+ * Set the RTC
+*/
+void rtc_set(struct rtc_time *tmp)
+{
+	unsigned long tim;
+	
+	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 (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


diff -purN uboot/lib_arm_orig/board.c uboot/lib_arm/board.c
--- uboot/lib_arm_orig/board.c	2008-05-19 03:47:11.000000000 -0700
+++ uboot/lib_arm/board.c	2008-07-16 16:45:31.984375000 -0700
@@ -85,6 +85,10 @@ extern void cs8900_get_enetaddr (uchar *
 extern void rtl8019_get_enetaddr (uchar * addr);
 #endif
 
+#if defined(CONFIG_RTC_PL031) && defined(CONFIG_CMD_DATE)
+extern int rtc_init(void);
+#endif
+
 #if defined(CONFIG_HARD_I2C) || \
     defined(CONFIG_SOFT_I2C)
 #include <i2c.h>
@@ -267,6 +271,9 @@ init_fnc_t *init_sequence[] = {
 #if defined(CONFIG_DISPLAY_BOARDINFO)
 	checkboard,		/* display board info */
 #endif
+#if defined(CONFIG_RTC_PL031) && defined(CONFIG_CMD_DATE)
+	rtc_init,
+#endif
 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
 	init_func_i2c,
 #endif



http://www.nabble.com/file/p18483701/add_arm_amba_pl031_rtc.patch
add_arm_amba_pl031_rtc.patch 

http://www.nabble.com/file/p18483701/add_rtc_init_arm_boot_seq.patch
add_rtc_init_arm_boot_seq.patch 
-- 
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