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 <irq_func.h>
12 #include <asm/processor.h>
13 #include <watchdog.h>
14 #ifdef CONFIG_LED_STATUS
15 #include <status_led.h>
16 #endif
17 #include <asm/ptrace.h>
18 
19 #ifndef CONFIG_MPC83XX_TIMER
20 #ifndef CONFIG_SYS_WATCHDOG_FREQ
21 #define CONFIG_SYS_WATCHDOG_FREQ (CONFIG_SYS_HZ / 2)
22 #endif
23 
24 static unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
25 
get_dec(void)26 static __inline__ unsigned long get_dec (void)
27 {
28 	unsigned long val;
29 
30 	asm volatile ("mfdec %0":"=r" (val):);
31 
32 	return val;
33 }
34 
35 
set_dec(unsigned long val)36 static __inline__ void set_dec (unsigned long val)
37 {
38 	if (val)
39 		asm volatile ("mtdec %0"::"r" (val));
40 }
41 #endif /* !CONFIG_MPC83XX_TIMER */
42 
enable_interrupts(void)43 void enable_interrupts(void)
44 {
45 	set_msr (get_msr () | MSR_EE);
46 }
47 
48 /* returns flag if MSR_EE was set before */
disable_interrupts(void)49 int disable_interrupts(void)
50 {
51 	ulong msr = get_msr ();
52 
53 	set_msr (msr & ~MSR_EE);
54 	return ((msr & MSR_EE) != 0);
55 }
56 
57 #ifndef CONFIG_MPC83XX_TIMER
interrupt_init(void)58 int interrupt_init(void)
59 {
60 	/* call cpu specific function from $(CPU)/interrupts.c */
61 	interrupt_init_cpu (&decrementer_count);
62 
63 	set_dec (decrementer_count);
64 
65 	set_msr (get_msr () | MSR_EE);
66 
67 	return (0);
68 }
69 
70 static volatile ulong timestamp = 0;
71 
timer_interrupt(struct pt_regs * regs)72 void timer_interrupt(struct pt_regs *regs)
73 {
74 	/* call cpu specific function from $(CPU)/interrupts.c */
75 	timer_interrupt_cpu (regs);
76 
77 	/* Restore Decrementer Count */
78 	set_dec (decrementer_count);
79 
80 	timestamp++;
81 
82 #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
83 	if ((timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0)
84 		WATCHDOG_RESET ();
85 #endif    /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
86 
87 #ifdef CONFIG_LED_STATUS
88 	status_led_tick(timestamp);
89 #endif /* CONFIG_LED_STATUS */
90 }
91 
get_timer(ulong base)92 ulong get_timer (ulong base)
93 {
94 	return (timestamp - base);
95 }
96 #endif /* !CONFIG_MPC83XX_TIMER */
97