[U-Boot-Users] [PATCH] ADD ARM AMBA PL031 RTC Support
Hebbar
gururajakr at sanyo.co.in
Wed Jul 16 11:24:45 CEST 2008
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 at 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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