/* $Id: timer.h,v 1.21 1999/04/20 13:22:51 anton Exp $ * timer.h: Definitions for the timer chips on the Sparc. * * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) */ #include <linux/config.h> #ifndef _SPARC_TIMER_H #define _SPARC_TIMER_H #include <asm/system.h> /* For SUN4M_NCPUS */ #include <asm/sun4paddr.h> #include <asm/btfixup.h> /* Timer structures. The interrupt timer has two properties which * are the counter (which is handled in do_timer in sched.c) and the limit. * This limit is where the timer's counter 'wraps' around. Oddly enough, * the sun4c timer when it hits the limit wraps back to 1 and not zero * thus when calculating the value at which it will fire a microsecond you * must adjust by one. Thanks SUN for designing such great hardware ;( */ /* Note that I am only going to use the timer that interrupts at * Sparc IRQ 10. There is another one available that can fire at * IRQ 14. Currently it is left untouched, we keep the PROM's limit * register value and let the prom take these interrupts. This allows * L1-A to work. */ struct sun4c_timer_info { __volatile__ unsigned int cur_count10; __volatile__ unsigned int timer_limit10; __volatile__ unsigned int cur_count14; __volatile__ unsigned int timer_limit14; }; #define SUN4C_TIMER_PHYSADDR 0xf3000000 #ifdef CONFIG_SUN4 #define SUN_TIMER_PHYSADDR SUN4_300_TIMER_PHYSADDR #else #define SUN_TIMER_PHYSADDR SUN4C_TIMER_PHYSADDR #endif /* A sun4m has two blocks of registers which are probably of the same * structure. LSI Logic's L64851 is told to _decrement_ from the limit * value. Aurora behaves similarly but its limit value is compacted in * other fashion (it's wider). Documented fields are defined here. */ /* As with the interrupt register, we have two classes of timer registers * which are per-cpu and master. Per-cpu timers only hit that cpu and are * only level 14 ticks, master timer hits all cpus and is level 10. */ #define SUN4M_PRM_CNT_L 0x80000000 #define SUN4M_PRM_CNT_LVALUE 0x7FFFFC00 struct sun4m_timer_percpu_info { __volatile__ unsigned int l14_timer_limit; /* Initial value is 0x009c4000 */ __volatile__ unsigned int l14_cur_count; /* This register appears to be write only and/or inaccessible * on Uni-Processor sun4m machines. */ __volatile__ unsigned int l14_limit_noclear; /* Data access error is here */ __volatile__ unsigned int cntrl; /* =1 after POST on Aurora */ __volatile__ unsigned char space[PAGE_SIZE - 16]; }; struct sun4m_timer_regs { struct sun4m_timer_percpu_info cpu_timers[SUN4M_NCPUS]; volatile unsigned int l10_timer_limit; volatile unsigned int l10_cur_count; /* Again, this appears to be write only and/or inaccessible * on uni-processor sun4m machines. */ volatile unsigned int l10_limit_noclear; /* This register too, it must be magic. */ volatile unsigned int foobar; volatile unsigned int cfg; /* equals zero at boot time... */ }; extern struct sun4m_timer_regs *sun4m_timers; #define SUN4D_PRM_CNT_L 0x80000000 #define SUN4D_PRM_CNT_LVALUE 0x7FFFFC00 struct sun4d_timer_regs { volatile unsigned int l10_timer_limit; volatile unsigned int l10_cur_countx; volatile unsigned int l10_limit_noclear; volatile unsigned int ctrl; volatile unsigned int l10_cur_count; }; extern struct sun4d_timer_regs *sun4d_timers; extern __volatile__ unsigned int *master_l10_counter; extern __volatile__ unsigned int *master_l10_limit; /* FIXME: Make do_[gs]ettimeofday btfixup calls */ BTFIXUPDEF_CALL(int, bus_do_settimeofday, struct timespec *tv) #define bus_do_settimeofday(tv) BTFIXUP_CALL(bus_do_settimeofday)(tv) #endif /* !(_SPARC_TIMER_H) */