diff options
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/Makefile | 1 | ||||
| -rwxr-xr-x | drivers/rtc/pl031.c | 123 |
2 files changed, 124 insertions, 0 deletions
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 86f855f..f41f33d 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -53,6 +53,7 @@ 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 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 |