[deliverable/linux.git] / arch / sparc / kernel / tick14.c

/* tick14.c
 * linux/arch/sparc/kernel/tick14.c
 *
 * Copyright (C) 1996 David Redman (djhr@tadpole.co.uk)
 *
 * This file handles the Sparc specific level14 ticker
 * This is really useful for profiling OBP uses it for keyboard
 * aborts and other stuff.
 *
 *
 */
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/timex.h>
#include <linux/interrupt.h>

#include <asm/oplib.h>
#include <asm/timer.h>
#include <asm/mostek.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/io.h>

extern unsigned long lvl14_save[5];
static unsigned long *linux_lvl14 = NULL;
static unsigned long obp_lvl14[4];
 
/*
 * Call with timer IRQ closed.
 * First time we do it with disable_irq, later prom code uses spin_lock_irq().
 */
void install_linux_ticker(void)
{

	if (!linux_lvl14)
		return;
	linux_lvl14[0] =  lvl14_save[0];
	linux_lvl14[1] =  lvl14_save[1];
	linux_lvl14[2] =  lvl14_save[2];
	linux_lvl14[3] =  lvl14_save[3];
}

void install_obp_ticker(void)
{

	if (!linux_lvl14)
		return;
	linux_lvl14[0] =  obp_lvl14[0];
	linux_lvl14[1] =  obp_lvl14[1];
	linux_lvl14[2] =  obp_lvl14[2];
	linux_lvl14[3] =  obp_lvl14[3]; 
}

void claim_ticker14(irqreturn_t (*handler)(int, void *),
		    int irq_nr, unsigned int timeout )
{
	int cpu = smp_processor_id();

	/* first we copy the obp handler instructions
	 */
	disable_irq(irq_nr);
	if (!handler)
		return;
    
	linux_lvl14 = (unsigned long *)lvl14_save[4];
	obp_lvl14[0] = linux_lvl14[0];
	obp_lvl14[1] = linux_lvl14[1];
	obp_lvl14[2] = linux_lvl14[2];
	obp_lvl14[3] = linux_lvl14[3];

	if (!request_irq(irq_nr,
			 handler,
			 (IRQF_DISABLED | SA_STATIC_ALLOC),
			 "counter14",
			 NULL)) {
		install_linux_ticker();
		load_profile_irq(cpu, timeout);
		enable_irq(irq_nr);
	}
}
Commit	Line	Data
1da177e4 LT	1	/* tick14.c
	2	* linux/arch/sparc/kernel/tick14.c
	3	*
	4	* Copyright (C) 1996 David Redman (djhr@tadpole.co.uk)
	5	*
	6	* This file handles the Sparc specific level14 ticker
	7	* This is really useful for profiling OBP uses it for keyboard
	8	* aborts and other stuff.
	9	*
	10	*
	11	*/
	12	#include <linux/errno.h>
	13	#include <linux/sched.h>
	14	#include <linux/kernel.h>
	15	#include <linux/param.h>
	16	#include <linux/string.h>
	17	#include <linux/mm.h>
	18	#include <linux/timex.h>
	19	#include <linux/interrupt.h>
	20
	21	#include <asm/oplib.h>
1da177e4 LT	22	#include <asm/timer.h>
	23	#include <asm/mostek.h>
	24	#include <asm/system.h>
	25	#include <asm/irq.h>
	26	#include <asm/io.h>
	27
	28	extern unsigned long lvl14_save[5];
	29	static unsigned long *linux_lvl14 = NULL;
	30	static unsigned long obp_lvl14[4];
	31
	32	/*
	33	* Call with timer IRQ closed.
	34	* First time we do it with disable_irq, later prom code uses spin_lock_irq().
	35	*/
	36	void install_linux_ticker(void)
	37	{
	38
	39	if (!linux_lvl14)
	40	return;
	41	linux_lvl14[0] = lvl14_save[0];
	42	linux_lvl14[1] = lvl14_save[1];
	43	linux_lvl14[2] = lvl14_save[2];
	44	linux_lvl14[3] = lvl14_save[3];
	45	}
	46
	47	void install_obp_ticker(void)
	48	{
	49
	50	if (!linux_lvl14)
	51	return;
	52	linux_lvl14[0] = obp_lvl14[0];
	53	linux_lvl14[1] = obp_lvl14[1];
	54	linux_lvl14[2] = obp_lvl14[2];
	55	linux_lvl14[3] = obp_lvl14[3];
	56	}
	57
0d84438d	58	void claim_ticker14(irqreturn_t (handler)(int, void ),
1da177e4 LT	59	int irq_nr, unsigned int timeout )
	60	{
	61	int cpu = smp_processor_id();
	62
	63	/* first we copy the obp handler instructions
	64	*/
	65	disable_irq(irq_nr);
	66	if (!handler)
	67	return;
	68
	69	linux_lvl14 = (unsigned long *)lvl14_save[4];
	70	obp_lvl14[0] = linux_lvl14[0];
	71	obp_lvl14[1] = linux_lvl14[1];
	72	obp_lvl14[2] = linux_lvl14[2];
	73	obp_lvl14[3] = linux_lvl14[3];
	74
	75	if (!request_irq(irq_nr,
	76	handler,
67413202	77	(IRQF_DISABLED \| SA_STATIC_ALLOC),
1da177e4 LT	78	"counter14",
	79	NULL)) {
	80	install_linux_ticker();
	81	load_profile_irq(cpu, timeout);
	82	enable_irq(irq_nr);
	83	}
	84	}