arch/sparc/lib/interrupts.c

   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  * (C) Copyright 2007
   9  * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
  10  *
  11  * SPDX-License-Identifier:     GPL-2.0+
  12  */
  13
  14 #include <common.h>
  15 #include <asm/processor.h>
  16 #include <asm/irq.h>
  17
  18 /* Implemented by SPARC CPUs */
  19 extern int interrupt_init_cpu(void);
  20 extern void timer_interrupt_cpu(void *arg);
  21 extern int timer_interrupt_init_cpu(void);
  22
  23 int intLock(void)
  24 {
  25         unsigned int pil;
  26
  27         pil = get_pil();
  28
  29         /* set PIL to 15 ==> no pending interrupts will interrupt CPU */
  30         set_pil(15);
  31
  32         return pil;
  33 }
  34
  35 void intUnlock(int oldLevel)
  36 {
  37         set_pil(oldLevel);
  38 }
  39
  40 void enable_interrupts(void)
  41 {
  42         set_pil(0);             /* enable all interrupts */
  43 }
  44
  45 int disable_interrupts(void)
  46 {
  47         return intLock();
  48 }
  49
  50 int interrupt_init(void)
  51 {
  52         int ret;
  53
  54         /* call cpu specific function from $(CPU)/interrupts.c */
  55         ret = interrupt_init_cpu();
  56
  57         /* enable global interrupts */
  58         enable_interrupts();
  59
  60         return ret;
  61 }
  62
  63 /* timer interrupt/overflow counter */
  64 static volatile ulong timestamp = 0;
  65
  66 /* regs can not be used here! regs is actually the pointer given in
  67  * irq_install_handler
  68  */
  69 void timer_interrupt(struct pt_regs *regs)
  70 {
  71         /* call cpu specific function from $(CPU)/interrupts.c */
  72         timer_interrupt_cpu((void *)regs);
  73
  74         timestamp++;
  75 }
  76
  77 ulong get_timer(ulong base)
  78 {
  79         return (timestamp - base);
  80 }
  81
  82 void timer_interrupt_init(void)
  83 {
  84         int irq;
  85
  86         timestamp = 0;
  87
  88         irq = timer_interrupt_init_cpu();
  89
  90         if (irq < 0) {
  91                 /* cpu specific code handled the interrupt registration it self */
  92                 return;
  93         }
  94         /* register interrupt handler for timer */
  95         irq_install_handler(irq, (void (*)(void *))timer_interrupt, NULL);
  96 }