1 /* 2 * (C) Copyright 2000-2002 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * (C) Copyright 2003 6 * Gleb Natapov <gnatapov@mrv.com> 7 * 8 * SPDX-License-Identifier: GPL-2.0+ 9 */ 10 11 #include <common.h> 12 #include <asm/processor.h> 13 #include <watchdog.h> 14 #ifdef CONFIG_LED_STATUS 15 #include <status_led.h> 16 #endif 17 18 #ifdef CONFIG_SHOW_ACTIVITY 19 void board_show_activity (ulong) __attribute__((weak, alias("__board_show_activity"))); 20 21 void __board_show_activity (ulong dummy) 22 { 23 return; 24 } 25 #endif /* CONFIG_SHOW_ACTIVITY */ 26 27 #ifndef CONFIG_SYS_WATCHDOG_FREQ 28 #define CONFIG_SYS_WATCHDOG_FREQ (CONFIG_SYS_HZ / 2) 29 #endif 30 31 static unsigned decrementer_count; /* count value for 1e6/HZ microseconds */ 32 33 static __inline__ unsigned long get_dec (void) 34 { 35 unsigned long val; 36 37 asm volatile ("mfdec %0":"=r" (val):); 38 39 return val; 40 } 41 42 43 static __inline__ void set_dec (unsigned long val) 44 { 45 if (val) 46 asm volatile ("mtdec %0"::"r" (val)); 47 } 48 49 50 void enable_interrupts (void) 51 { 52 set_msr (get_msr () | MSR_EE); 53 } 54 55 /* returns flag if MSR_EE was set before */ 56 int disable_interrupts (void) 57 { 58 ulong msr = get_msr (); 59 60 set_msr (msr & ~MSR_EE); 61 return ((msr & MSR_EE) != 0); 62 } 63 64 int interrupt_init (void) 65 { 66 /* call cpu specific function from $(CPU)/interrupts.c */ 67 interrupt_init_cpu (&decrementer_count); 68 69 set_dec (decrementer_count); 70 71 set_msr (get_msr () | MSR_EE); 72 73 return (0); 74 } 75 76 static volatile ulong timestamp = 0; 77 78 void timer_interrupt (struct pt_regs *regs) 79 { 80 /* call cpu specific function from $(CPU)/interrupts.c */ 81 timer_interrupt_cpu (regs); 82 83 /* Restore Decrementer Count */ 84 set_dec (decrementer_count); 85 86 timestamp++; 87 88 #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG) 89 if ((timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0) 90 WATCHDOG_RESET (); 91 #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */ 92 93 #ifdef CONFIG_LED_STATUS 94 status_led_tick (timestamp); 95 #endif /* CONFIG_LED_STATUS */ 96 97 #ifdef CONFIG_SHOW_ACTIVITY 98 board_show_activity (timestamp); 99 #endif /* CONFIG_SHOW_ACTIVITY */ 100 } 101 102 ulong get_timer (ulong base) 103 { 104 return (timestamp - base); 105 } 106