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ARM: footbridge: trim down old ISA rtc setup
This fixes a "start_kernel(): bug: interrupts were enabled early". rtc_cmos now takes care of initializing the ISA RTC and reading the current time and date from it; there's no need to repeat that here, thereby causing interrupts to be enabled too early. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
parent
6dc995a3da
commit
382b4480ff
6 changed files with 73 additions and 174 deletions
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@ -4,7 +4,7 @@
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# Object file lists.
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obj-y := common.o dc21285.o dma.o isa-irq.o time.o
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obj-y := common.o dc21285.o dma.o isa-irq.o
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obj-m :=
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obj-n :=
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obj- :=
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@ -25,4 +25,4 @@ obj-$(CONFIG_ARCH_PERSONAL_SERVER) += personal.o dc21285-timer.o
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obj-$(CONFIG_PCI) +=$(pci-y)
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obj-$(CONFIG_LEDS) +=$(leds-y)
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obj-$(CONFIG_ISA) += isa.o
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obj-$(CONFIG_ISA) += isa.o isa-rtc.o
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@ -56,8 +56,6 @@ static void __init footbridge_timer_init(void)
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*CSR_TIMER1_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_AUTORELOAD | TIMER_CNTL_DIV16;
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setup_irq(IRQ_TIMER1, &footbridge_timer_irq);
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isa_rtc_init();
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}
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struct sys_timer footbridge_timer = {
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57
arch/arm/mach-footbridge/isa-rtc.c
Normal file
57
arch/arm/mach-footbridge/isa-rtc.c
Normal file
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@ -0,0 +1,57 @@
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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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@ -76,8 +76,6 @@ static struct irqaction isa_timer_irq = {
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static void __init isa_timer_init(void)
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{
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isa_rtc_init();
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/* enable PIT timer */
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/* set for periodic (4) and LSB/MSB write (0x30) */
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outb(0x34, 0x43);
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@ -11,6 +11,9 @@
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#include <linux/serial_8250.h>
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#include <asm/irq.h>
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#include <asm/hardware/dec21285.h>
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#include "common.h"
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static struct resource rtc_resources[] = {
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[0] = {
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@ -77,11 +80,18 @@ static struct platform_device serial_device = {
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static int __init footbridge_isa_init(void)
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{
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int err;
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int err = 0;
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err = platform_device_register(&rtc_device);
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if (err)
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printk(KERN_ERR "Unable to register RTC device: %d\n", err);
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if (!footbridge_cfn_mode())
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return 0;
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/* Personal server doesn't have RTC */
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if (!machine_is_personal_server()) {
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isa_rtc_init();
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err = platform_device_register(&rtc_device);
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if (err)
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printk(KERN_ERR "Unable to register RTC device: %d\n", err);
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}
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err = platform_device_register(&serial_device);
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if (err)
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printk(KERN_ERR "Unable to register serial device: %d\n", err);
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@ -1,164 +0,0 @@
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/*
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* arch/arm/mach-footbridge/include/mach/time.h
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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) (rtc_base+(x))
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#define RTC_ALWAYS_BCD 0
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#include <linux/timex.h>
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#include <linux/init.h>
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#include <linux/sched.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 <mach/hardware.h>
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#include <asm/mach/time.h>
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#include "common.h"
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static int rtc_base;
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static unsigned long __init get_isa_cmos_time(void)
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{
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unsigned int year, mon, day, hour, min, sec;
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// check to see if the RTC makes sense.....
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if ((CMOS_READ(RTC_VALID) & RTC_VRT) == 0)
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return mktime(1970, 1, 1, 0, 0, 0);
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do {
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sec = CMOS_READ(RTC_SECONDS);
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min = CMOS_READ(RTC_MINUTES);
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hour = CMOS_READ(RTC_HOURS);
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day = CMOS_READ(RTC_DAY_OF_MONTH);
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mon = CMOS_READ(RTC_MONTH);
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year = CMOS_READ(RTC_YEAR);
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} while (sec != CMOS_READ(RTC_SECONDS));
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if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
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sec = bcd2bin(sec);
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min = bcd2bin(min);
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hour = bcd2bin(hour);
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day = bcd2bin(day);
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mon = bcd2bin(mon);
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year = bcd2bin(year);
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}
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if ((year += 1900) < 1970)
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year += 100;
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return mktime(year, mon, day, hour, min, sec);
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}
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static int set_isa_cmos_time(void)
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{
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int retval = 0;
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int real_seconds, real_minutes, cmos_minutes;
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unsigned char save_control, save_freq_select;
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unsigned long nowtime = xtime.tv_sec;
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save_control = CMOS_READ(RTC_CONTROL); /* tell the clock it's being set */
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CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
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save_freq_select = CMOS_READ(RTC_FREQ_SELECT); /* stop and reset prescaler */
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CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
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cmos_minutes = CMOS_READ(RTC_MINUTES);
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if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
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cmos_minutes = bcd2bin(cmos_minutes);
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/*
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* since we're only adjusting minutes and seconds,
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* don't interfere with hour overflow. This avoids
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* messing with unknown time zones but requires your
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* RTC not to be off by more than 15 minutes
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*/
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real_seconds = nowtime % 60;
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real_minutes = nowtime / 60;
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if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)
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real_minutes += 30; /* correct for half hour time zone */
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real_minutes %= 60;
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if (abs(real_minutes - cmos_minutes) < 30) {
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if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
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real_seconds = bin2bcd(real_seconds);
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real_minutes = bin2bcd(real_minutes);
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}
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CMOS_WRITE(real_seconds,RTC_SECONDS);
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CMOS_WRITE(real_minutes,RTC_MINUTES);
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} else
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retval = -1;
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/* The following flags have to be released exactly in this order,
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* otherwise the DS12887 (popular MC146818A clone with integrated
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* battery and quartz) will not reset the oscillator and will not
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* update precisely 500 ms later. You won't find this mentioned in
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* the Dallas Semiconductor data sheets, but who believes data
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* sheets anyway ... -- Markus Kuhn
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*/
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CMOS_WRITE(save_control, RTC_CONTROL);
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CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
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return retval;
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}
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void __init isa_rtc_init(void)
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{
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if (machine_is_personal_server())
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/*
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* Add-in 21285s shouldn't access the RTC
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*/
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rtc_base = 0;
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else
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rtc_base = 0x70;
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if (rtc_base) {
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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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struct timespec tv;
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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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tv.tv_nsec = 0;
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tv.tv_sec = get_isa_cmos_time();
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do_settimeofday(&tv);
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set_rtc = set_isa_cmos_time;
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} else
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rtc_base = 0;
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}
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}
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