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@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