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58 lines
1.2 KiB
58 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* arch/arm/mach-footbridge/isa-rtc.c |
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* |
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* Copyright (C) 1998 Russell King. |
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* Copyright (C) 1998 Phil Blundell |
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* |
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* CATS has a real-time clock, though the evaluation board doesn't. |
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* |
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* Changelog: |
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* 21-Mar-1998 RMK Created |
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* 27-Aug-1998 PJB CATS support |
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* 28-Dec-1998 APH Made leds optional |
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* 20-Jan-1999 RMK Started merge of EBSA285, CATS and NetWinder |
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* 16-Mar-1999 RMK More support for EBSA285-like machines with RTCs in |
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*/ |
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#define RTC_PORT(x) (0x70+(x)) |
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#define RTC_ALWAYS_BCD 0 |
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#include <linux/init.h> |
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#include <linux/mc146818rtc.h> |
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#include <linux/bcd.h> |
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#include <linux/io.h> |
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#include "common.h" |
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void __init isa_rtc_init(void) |
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{ |
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int reg_d, reg_b; |
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/* |
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* Probe for the RTC. |
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*/ |
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reg_d = CMOS_READ(RTC_REG_D); |
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/* |
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* make sure the divider is set |
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*/ |
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CMOS_WRITE(RTC_REF_CLCK_32KHZ, RTC_REG_A); |
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/* |
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* Set control reg B |
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* (24 hour mode, update enabled) |
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*/ |
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reg_b = CMOS_READ(RTC_REG_B) & 0x7f; |
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reg_b |= 2; |
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CMOS_WRITE(reg_b, RTC_REG_B); |
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if ((CMOS_READ(RTC_REG_A) & 0x7f) == RTC_REF_CLCK_32KHZ && |
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CMOS_READ(RTC_REG_B) == reg_b) { |
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/* |
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* We have a RTC. Check the battery |
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*/ |
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if ((reg_d & 0x80) == 0) |
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printk(KERN_WARNING "RTC: *** warning: CMOS battery bad\n"); |
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} |
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}
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