1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2000-2002 4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 5 * 6 * (C) Copyright 2003 7 * Gleb Natapov <gnatapov@mrv.com> 8 */ 9 10 #include <common.h> 11 #include <asm/processor.h> 12 #include <watchdog.h> 13 #ifdef CONFIG_LED_STATUS 14 #include <status_led.h> 15 #endif 16 17 #ifndef CONFIG_MPC83XX_TIMER 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 #endif /* !CONFIG_MPC83XX_TIMER */ 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 #ifndef CONFIG_MPC83XX_TIMER 65 int interrupt_init (void) 66 { 67 /* call cpu specific function from $(CPU)/interrupts.c */ 68 interrupt_init_cpu (&decrementer_count); 69 70 set_dec (decrementer_count); 71 72 set_msr (get_msr () | MSR_EE); 73 74 return (0); 75 } 76 77 static volatile ulong timestamp = 0; 78 79 void timer_interrupt (struct pt_regs *regs) 80 { 81 /* call cpu specific function from $(CPU)/interrupts.c */ 82 timer_interrupt_cpu (regs); 83 84 /* Restore Decrementer Count */ 85 set_dec (decrementer_count); 86 87 timestamp++; 88 89 #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG) 90 if ((timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0) 91 WATCHDOG_RESET (); 92 #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */ 93 94 #ifdef CONFIG_LED_STATUS 95 status_led_tick (timestamp); 96 #endif /* CONFIG_LED_STATUS */ 97 98 #ifdef CONFIG_SHOW_ACTIVITY 99 board_show_activity (timestamp); 100 #endif /* CONFIG_SHOW_ACTIVITY */ 101 } 102 103 ulong get_timer (ulong base) 104 { 105 return (timestamp - base); 106 } 107 #endif /* !CONFIG_MPC83XX_TIMER */ 108