diff options
Diffstat (limited to 'arch/mips/mips-boards/generic/time.c')
| -rw-r--r-- | arch/mips/mips-boards/generic/time.c | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/arch/mips/mips-boards/generic/time.c b/arch/mips/mips-boards/generic/time.c deleted file mode 100644 index fe7fc17305a..00000000000 --- a/arch/mips/mips-boards/generic/time.c +++ /dev/null @@ -1,167 +0,0 @@ -/* - * Carsten Langgaard, carstenl@mips.com - * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved. - * - * This program is free software; you can distribute it and/or modify it - * under the terms of the GNU General Public License (Version 2) as - * published by the Free Software Foundation. - * - * This program is distributed in the hope 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. - * - * Setting up the clock on the MIPS boards. - */ - -#include <linux/types.h> -#include <linux/config.h> -#include <linux/init.h> -#include <linux/kernel_stat.h> -#include <linux/sched.h> -#include <linux/spinlock.h> -#include <linux/interrupt.h> -#include <linux/time.h> -#include <linux/timex.h> -#include <linux/mc146818rtc.h> - -#include <asm/mipsregs.h> -#include <asm/ptrace.h> -#include <asm/div64.h> -#include <asm/cpu.h> -#include <asm/time.h> -#include <asm/mc146818-time.h> - -#include <asm/mips-boards/generic.h> -#include <asm/mips-boards/prom.h> - -unsigned long cpu_khz; - -#if defined(CONFIG_MIPS_SEAD) -#define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ5) -#else -#define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5) -#endif - -#if defined(CONFIG_MIPS_ATLAS) -static char display_string[] = " LINUX ON ATLAS "; -#endif -#if defined(CONFIG_MIPS_MALTA) -static char display_string[] = " LINUX ON MALTA "; -#endif -#if defined(CONFIG_MIPS_SEAD) -static char display_string[] = " LINUX ON SEAD "; -#endif -static unsigned int display_count = 0; -#define MAX_DISPLAY_COUNT (sizeof(display_string) - 8) - -#define MIPS_CPU_TIMER_IRQ (NR_IRQS-1) - -static unsigned int timer_tick_count=0; - -void mips_timer_interrupt(struct pt_regs *regs) -{ - if ((timer_tick_count++ % HZ) == 0) { - mips_display_message(&display_string[display_count++]); - if (display_count == MAX_DISPLAY_COUNT) - display_count = 0; - - } - - ll_timer_interrupt(MIPS_CPU_TIMER_IRQ, regs); -} - -/* - * Estimate CPU frequency. Sets mips_counter_frequency as a side-effect - */ -static unsigned int __init estimate_cpu_frequency(void) -{ - unsigned int prid = read_c0_prid() & 0xffff00; - unsigned int count; - -#ifdef CONFIG_MIPS_SEAD - /* - * The SEAD board doesn't have a real time clock, so we can't - * really calculate the timer frequency - * For now we hardwire the SEAD board frequency to 12MHz. - */ - - if ((prid == (PRID_COMP_MIPS | PRID_IMP_20KC)) || - (prid == (PRID_COMP_MIPS | PRID_IMP_25KF))) - count = 12000000; - else - count = 6000000; -#endif -#if defined(CONFIG_MIPS_ATLAS) || defined(CONFIG_MIPS_MALTA) - unsigned int flags; - - local_irq_save(flags); - - /* Start counter exactly on falling edge of update flag */ - while (CMOS_READ(RTC_REG_A) & RTC_UIP); - while (!(CMOS_READ(RTC_REG_A) & RTC_UIP)); - - /* Start r4k counter. */ - write_c0_count(0); - - /* Read counter exactly on falling edge of update flag */ - while (CMOS_READ(RTC_REG_A) & RTC_UIP); - while (!(CMOS_READ(RTC_REG_A) & RTC_UIP)); - - count = read_c0_count(); - - /* restore interrupts */ - local_irq_restore(flags); -#endif - - mips_hpt_frequency = count; - if ((prid != (PRID_COMP_MIPS | PRID_IMP_20KC)) && - (prid != (PRID_COMP_MIPS | PRID_IMP_25KF))) - count *= 2; - - count += 5000; /* round */ - count -= count%10000; - - return count; -} - -unsigned long __init mips_rtc_get_time(void) -{ - return mc146818_get_cmos_time(); -} - -void __init mips_time_init(void) -{ - unsigned int est_freq, flags; - - local_irq_save(flags); - -#if defined(CONFIG_MIPS_ATLAS) || defined(CONFIG_MIPS_MALTA) - /* Set Data mode - binary. */ - CMOS_WRITE(CMOS_READ(RTC_CONTROL) | RTC_DM_BINARY, RTC_CONTROL); -#endif - - est_freq = estimate_cpu_frequency (); - - printk("CPU frequency %d.%02d MHz\n", est_freq/1000000, - (est_freq%1000000)*100/1000000); - - cpu_khz = est_freq / 1000; - - local_irq_restore(flags); -} - -void __init mips_timer_setup(struct irqaction *irq) -{ - /* we are using the cpu counter for timer interrupts */ - irq->handler = no_action; /* we use our own handler */ - setup_irq(MIPS_CPU_TIMER_IRQ, irq); - - /* to generate the first timer interrupt */ - write_c0_compare (read_c0_count() + mips_hpt_frequency/HZ); - set_c0_status(ALLINTS); -} |