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2c21749d71
Add a timer driver for the MPC83xx architecture. Signed-off-by: Mario Six <mario.six@gdsys.cc>
108 lines
2.1 KiB
C
108 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2000-2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2003
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* Gleb Natapov <gnatapov@mrv.com>
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*/
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#include <common.h>
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#include <asm/processor.h>
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#include <watchdog.h>
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#ifdef CONFIG_LED_STATUS
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#include <status_led.h>
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#endif
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#ifndef CONFIG_MPC83XX_TIMER
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#ifdef CONFIG_SHOW_ACTIVITY
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void board_show_activity (ulong) __attribute__((weak, alias("__board_show_activity")));
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void __board_show_activity (ulong dummy)
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{
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return;
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}
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#endif /* CONFIG_SHOW_ACTIVITY */
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#ifndef CONFIG_SYS_WATCHDOG_FREQ
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#define CONFIG_SYS_WATCHDOG_FREQ (CONFIG_SYS_HZ / 2)
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#endif
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static unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
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static __inline__ unsigned long get_dec (void)
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{
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unsigned long val;
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asm volatile ("mfdec %0":"=r" (val):);
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return val;
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}
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static __inline__ void set_dec (unsigned long val)
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{
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if (val)
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asm volatile ("mtdec %0"::"r" (val));
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}
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#endif /* !CONFIG_MPC83XX_TIMER */
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void enable_interrupts (void)
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{
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set_msr (get_msr () | MSR_EE);
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}
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/* returns flag if MSR_EE was set before */
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int disable_interrupts (void)
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{
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ulong msr = get_msr ();
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set_msr (msr & ~MSR_EE);
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return ((msr & MSR_EE) != 0);
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}
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#ifndef CONFIG_MPC83XX_TIMER
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int interrupt_init (void)
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{
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/* call cpu specific function from $(CPU)/interrupts.c */
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interrupt_init_cpu (&decrementer_count);
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set_dec (decrementer_count);
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set_msr (get_msr () | MSR_EE);
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return (0);
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}
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static volatile ulong timestamp = 0;
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void timer_interrupt (struct pt_regs *regs)
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{
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/* call cpu specific function from $(CPU)/interrupts.c */
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timer_interrupt_cpu (regs);
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/* Restore Decrementer Count */
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set_dec (decrementer_count);
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timestamp++;
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#if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
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if ((timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0)
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WATCHDOG_RESET ();
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#endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
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#ifdef CONFIG_LED_STATUS
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status_led_tick (timestamp);
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#endif /* CONFIG_LED_STATUS */
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#ifdef CONFIG_SHOW_ACTIVITY
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board_show_activity (timestamp);
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#endif /* CONFIG_SHOW_ACTIVITY */
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}
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ulong get_timer (ulong base)
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{
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return (timestamp - base);
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}
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#endif /* !CONFIG_MPC83XX_TIMER */
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