arch/sparc/include/asm/timer_32.h

   1 /*
   2  * timer.h:  Definitions for the timer chips on the Sparc.
   3  *
   4  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7
   8 #ifndef _SPARC_TIMER_H
   9 #define _SPARC_TIMER_H
  10
  11 #include <asm/system.h>  /* For SUN4M_NCPUS */
  12 #include <asm/btfixup.h>
  13
  14 /* Timer structures. The interrupt timer has two properties which
  15  * are the counter (which is handled in do_timer in sched.c) and the limit.
  16  * This limit is where the timer's counter 'wraps' around. Oddly enough,
  17  * the sun4c timer when it hits the limit wraps back to 1 and not zero
  18  * thus when calculating the value at which it will fire a microsecond you
  19  * must adjust by one.  Thanks SUN for designing such great hardware ;(
  20  */
  21
  22 /* Note that I am only going to use the timer that interrupts at
  23  * Sparc IRQ 10.  There is another one available that can fire at
  24  * IRQ 14. Currently it is left untouched, we keep the PROM's limit
  25  * register value and let the prom take these interrupts.  This allows
  26  * L1-A to work.
  27  */
  28
  29 struct sun4c_timer_info {
  30   __volatile__ unsigned int cur_count10;
  31   __volatile__ unsigned int timer_limit10;
  32   __volatile__ unsigned int cur_count14;
  33   __volatile__ unsigned int timer_limit14;
  34 };
  35
  36 #define SUN_TIMER_PHYSADDR   0xf3000000
  37
  38 #define SUN4D_PRM_CNT_L       0x80000000
  39 #define SUN4D_PRM_CNT_LVALUE  0x7FFFFC00
  40
  41 struct sun4d_timer_regs {
  42         volatile unsigned int l10_timer_limit;
  43         volatile unsigned int l10_cur_countx;
  44         volatile unsigned int l10_limit_noclear;
  45         volatile unsigned int ctrl;
  46         volatile unsigned int l10_cur_count;
  47 };
  48
  49 extern struct sun4d_timer_regs *sun4d_timers;
  50
  51 extern __volatile__ unsigned int *master_l10_counter;
  52 extern __volatile__ unsigned int *master_l10_limit;
  53
  54 /* FIXME: Make do_[gs]ettimeofday btfixup calls */
  55 BTFIXUPDEF_CALL(int, bus_do_settimeofday, struct timespec *tv)
  56 #define bus_do_settimeofday(tv) BTFIXUP_CALL(bus_do_settimeofday)(tv)
  57
  58 #endif /* !(_SPARC_TIMER_H) */