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 extern int interrupt_init_cpu (unsigned *); 32 extern void timer_interrupt_cpu (struct pt_regs *); 33 34 static unsigned decrementer_count; /* count value for 1e6/HZ microseconds */ 35 36 static __inline__ unsigned long get_dec (void) 37 { 38 unsigned long val; 39 40 asm volatile ("mfdec %0":"=r" (val):); 41 42 return val; 43 } 44 45 46 static __inline__ void set_dec (unsigned long val) 47 { 48 if (val) 49 asm volatile ("mtdec %0"::"r" (val)); 50 } 51 52 53 void enable_interrupts (void) 54 { 55 set_msr (get_msr () | MSR_EE); 56 } 57 58 /* returns flag if MSR_EE was set before */ 59 int disable_interrupts (void) 60 { 61 ulong msr = get_msr (); 62 63 set_msr (msr & ~MSR_EE); 64 return ((msr & MSR_EE) != 0); 65 } 66 67 int interrupt_init (void) 68 { 69 int ret; 70 71 /* call cpu specific function from $(CPU)/interrupts.c */ 72 ret = interrupt_init_cpu (&decrementer_count); 73 74 if (ret) 75 return ret; 76 77 set_dec (decrementer_count); 78 79 set_msr (get_msr () | MSR_EE); 80 81 return (0); 82 } 83 84 static volatile ulong timestamp = 0; 85 86 void timer_interrupt (struct pt_regs *regs) 87 { 88 /* call cpu specific function from $(CPU)/interrupts.c */ 89 timer_interrupt_cpu (regs); 90 91 /* Restore Decrementer Count */ 92 set_dec (decrementer_count); 93 94 timestamp++; 95 96 #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG) 97 if ((timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0) 98 WATCHDOG_RESET (); 99 #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */ 100 101 #ifdef CONFIG_LED_STATUS 102 status_led_tick (timestamp); 103 #endif /* CONFIG_LED_STATUS */ 104 105 #ifdef CONFIG_SHOW_ACTIVITY 106 board_show_activity (timestamp); 107 #endif /* CONFIG_SHOW_ACTIVITY */ 108 } 109 110 ulong get_timer (ulong base) 111 { 112 return (timestamp - base); 113 } 114