diff options
Diffstat (limited to 'arch/mips/ddb5xxx/common/rtc_ds1386.c')
| -rw-r--r-- | arch/mips/ddb5xxx/common/rtc_ds1386.c | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/arch/mips/ddb5xxx/common/rtc_ds1386.c b/arch/mips/ddb5xxx/common/rtc_ds1386.c deleted file mode 100644 index 5dc34daa715..00000000000 --- a/arch/mips/ddb5xxx/common/rtc_ds1386.c +++ /dev/null @@ -1,170 +0,0 @@ -/* - * Copyright 2001 MontaVista Software Inc. - * Author: jsun@mvista.com or jsun@junsun.net - * - * arch/mips/ddb5xxx/common/rtc_ds1386.c - * low-level RTC hookups for s for Dallas 1396 chip. - * - * 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 file exports a function, rtc_ds1386_init(), which expects an - * uncached base address as the argument. It will set the two function - * pointers expected by the MIPS generic timer code. - */ - -#include <linux/types.h> -#include <linux/time.h> -#include <linux/bcd.h> - -#include <asm/time.h> -#include <asm/addrspace.h> - -#include <asm/mc146818rtc.h> -#include <asm/debug.h> - -#define EPOCH 2000 - -#define READ_RTC(x) *(volatile unsigned char*)(rtc_base+x) -#define WRITE_RTC(x, y) *(volatile unsigned char*)(rtc_base+x) = y - -static unsigned long rtc_base; - -static unsigned long -rtc_ds1386_get_time(void) -{ - u8 byte; - u8 temp; - unsigned int year, month, day, hour, minute, second; - unsigned long flags; - - spin_lock_irqsave(&rtc_lock, flags); - /* let us freeze external registers */ - byte = READ_RTC(0xB); - byte &= 0x3f; - WRITE_RTC(0xB, byte); - - /* read time data */ - year = BCD2BIN(READ_RTC(0xA)) + EPOCH; - month = BCD2BIN(READ_RTC(0x9) & 0x1f); - day = BCD2BIN(READ_RTC(0x8)); - minute = BCD2BIN(READ_RTC(0x2)); - second = BCD2BIN(READ_RTC(0x1)); - - /* hour is special - deal with it later */ - temp = READ_RTC(0x4); - - /* enable time transfer */ - byte |= 0x80; - WRITE_RTC(0xB, byte); - spin_unlock_irqrestore(&rtc_lock, flags); - - /* calc hour */ - if (temp & 0x40) { - /* 12 hour format */ - hour = BCD2BIN(temp & 0x1f); - if (temp & 0x20) hour += 12; /* PM */ - } else { - /* 24 hour format */ - hour = BCD2BIN(temp & 0x3f); - } - - return mktime(year, month, day, hour, minute, second); -} - -static int -rtc_ds1386_set_time(unsigned long t) -{ - struct rtc_time tm; - u8 byte; - u8 temp; - u8 year, month, day, hour, minute, second; - unsigned long flags; - - spin_lock_irqsave(&rtc_lock, flags); - /* let us freeze external registers */ - byte = READ_RTC(0xB); - byte &= 0x3f; - WRITE_RTC(0xB, byte); - - /* convert */ - to_tm(t, &tm); - - - /* check each field one by one */ - year = BIN2BCD(tm.tm_year - EPOCH); - if (year != READ_RTC(0xA)) { - WRITE_RTC(0xA, year); - } - - temp = READ_RTC(0x9); - month = BIN2BCD(tm.tm_mon+1); /* tm_mon starts from 0 to 11 */ - if (month != (temp & 0x1f)) { - WRITE_RTC( 0x9, - (month & 0x1f) | (temp & ~0x1f) ); - } - - day = BIN2BCD(tm.tm_mday); - if (day != READ_RTC(0x8)) { - WRITE_RTC(0x8, day); - } - - temp = READ_RTC(0x4); - if (temp & 0x40) { - /* 12 hour format */ - hour = 0x40; - if (tm.tm_hour > 12) { - hour |= 0x20 | (BIN2BCD(hour-12) & 0x1f); - } else { - hour |= BIN2BCD(tm.tm_hour); - } - } else { - /* 24 hour format */ - hour = BIN2BCD(tm.tm_hour) & 0x3f; - } - if (hour != temp) WRITE_RTC(0x4, hour); - - minute = BIN2BCD(tm.tm_min); - if (minute != READ_RTC(0x2)) { - WRITE_RTC(0x2, minute); - } - - second = BIN2BCD(tm.tm_sec); - if (second != READ_RTC(0x1)) { - WRITE_RTC(0x1, second); - } - spin_unlock_irqrestore(&rtc_lock, flags); - - return 0; -} - -void -rtc_ds1386_init(unsigned long base) -{ - unsigned char byte; - - /* remember the base */ - rtc_base = base; - db_assert((rtc_base & 0xe0000000) == KSEG1); - - /* turn on RTC if it is not on */ - byte = READ_RTC(0x9); - if (byte & 0x80) { - byte &= 0x7f; - WRITE_RTC(0x9, byte); - } - - /* enable time transfer */ - byte = READ_RTC(0xB); - byte |= 0x80; - WRITE_RTC(0xB, byte); - - /* set the function pointers */ - rtc_mips_get_time = rtc_ds1386_get_time; - rtc_mips_set_time = rtc_ds1386_set_time; -} |