/* * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> * Copyright (C) 2007-2009 PetaLogix * Copyright (C) 2006 Atmark Techno, Inc. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/init.h>#include <linux/kernel.h>#include <linux/param.h>#include <linux/interrupt.h>#include <linux/profile.h>#include <linux/irq.h>#include <linux/delay.h>#include <linux/sched.h>#include <linux/spinlock.h>#include <linux/err.h>#include <linux/clk.h>#include <linux/clocksource.h>#include <linux/clockchips.h>#include <linux/io.h>#include <linux/bug.h>#include <asm/cpuinfo.h>#include <asm/setup.h>#include <asm/prom.h>#include <asm/irq.h>#include <asm/system.h>#include <linux/cnt32_to_63.h> #ifdef CONFIG_SELFMOD_TIMER#include <asm/selfmod.h>#define TIMER_BASE	BARRIER_BASE_ADDR#elsestatic unsigned int timer_baseaddr;#define TIMER_BASE	timer_baseaddr#endif static unsigned int freq_div_hz;static unsigned int timer_clock_freq; #define TCSR0	(0x00)#define TLR0	(0x04)#define TCR0	(0x08)#define TCSR1	(0x10)#define TLR1	(0x14)#define TCR1	(0x18) #define TCSR_MDT	(1<<0)#define TCSR_UDT	(1<<1)#define TCSR_GENT	(1<<2)#define TCSR_CAPT	(1<<3)#define TCSR_ARHT	(1<<4)#define TCSR_LOAD	(1<<5)#define TCSR_ENIT	(1<<6)#define TCSR_ENT	(1<<7)#define TCSR_TINT	(1<<8)#define TCSR_PWMA	(1<<9)#define TCSR_ENALL	(1<<10) static inline void microblaze_timer0_stop(void){	out_be32(TIMER_BASE + TCSR0, in_be32(TIMER_BASE + TCSR0) & ~TCSR_ENT);} static inline void microblaze_timer0_start_periodic(unsigned long load_val){	if (!load_val)		load_val = 1;	out_be32(TIMER_BASE + TLR0, load_val); /* loading value to timer reg */ 	/* load the initial value */	out_be32(TIMER_BASE + TCSR0, TCSR_LOAD); 	/* see timer data sheet for detail	 * !ENALL - don't enable 'em all	 * !PWMA - disable pwm	 * TINT - clear interrupt status	 * ENT- enable timer itself	 * EINT - enable interrupt	 * !LOAD - clear the bit to let go	 * ARHT - auto reload	 * !CAPT - no external trigger	 * !GENT - no external signal	 * UDT - set the timer as down counter	 * !MDT0 - generate mode	 */	out_be32(TIMER_BASE + TCSR0,			TCSR_TINT|TCSR_ENIT|TCSR_ENT|TCSR_ARHT|TCSR_UDT);} static inline void microblaze_timer0_start_oneshot(unsigned long load_val){	if (!load_val)		load_val = 1;	out_be32(TIMER_BASE + TLR0, load_val); /* loading value to timer reg */ 	/* load the initial value */	out_be32(TIMER_BASE + TCSR0, TCSR_LOAD); 	out_be32(TIMER_BASE + TCSR0,			TCSR_TINT|TCSR_ENIT|TCSR_ENT|TCSR_ARHT|TCSR_UDT);} static int microblaze_timer_set_next_event(unsigned long delta,					struct clock_event_device *dev){	pr_debug("%s: next event, delta %x\n", __func__, (u32)delta);	microblaze_timer0_start_oneshot(delta);	return 0;} static void microblaze_timer_set_mode(enum clock_event_mode mode,				struct clock_event_device *evt){	switch (mode) {	case CLOCK_EVT_MODE_PERIODIC:		printk(KERN_INFO "%s: periodic\n", __func__);		microblaze_timer0_start_periodic(freq_div_hz);		break;	case CLOCK_EVT_MODE_ONESHOT:		printk(KERN_INFO "%s: oneshot\n", __func__);		break;	case CLOCK_EVT_MODE_UNUSED:		printk(KERN_INFO "%s: unused\n", __func__);		break;	case CLOCK_EVT_MODE_SHUTDOWN:		printk(KERN_INFO "%s: shutdown\n", __func__);		microblaze_timer0_stop();		break;	case CLOCK_EVT_MODE_RESUME:		printk(KERN_INFO "%s: resume\n", __func__);		break;	}} static struct clock_event_device clockevent_microblaze_timer = {	.name		= "microblaze_clockevent",	.features       = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC,	.shift		= 8,	.rating		= 300,	.set_next_event	= microblaze_timer_set_next_event,	.set_mode	= microblaze_timer_set_mode,}; static inline void timer_ack(void){	out_be32(TIMER_BASE + TCSR0, in_be32(TIMER_BASE + TCSR0));} static irqreturn_t timer_interrupt(int irq, void *dev_id){	struct clock_event_device *evt = &clockevent_microblaze_timer;#ifdef CONFIG_HEART_BEAT	heartbeat();#endif	timer_ack();	evt->event_handler(evt);	return IRQ_HANDLED;} static struct irqaction timer_irqaction = {	.handler = timer_interrupt,	.flags = IRQF_DISABLED | IRQF_TIMER,	.name = "timer",	.dev_id = &clockevent_microblaze_timer,}; static __init void microblaze_clockevent_init(void){	clockevent_microblaze_timer.mult =		div_sc(timer_clock_freq, NSEC_PER_SEC,				clockevent_microblaze_timer.shift);	clockevent_microblaze_timer.max_delta_ns =		clockevent_delta2ns((u32)~0, &clockevent_microblaze_timer);	clockevent_microblaze_timer.min_delta_ns =		clockevent_delta2ns(1, &clockevent_microblaze_timer);	clockevent_microblaze_timer.cpumask = cpumask_of(0);	clockevents_register_device(&clockevent_microblaze_timer);} static cycle_t microblaze_read(struct clocksource *cs){	/* reading actual value of timer 1 */	return (cycle_t) (in_be32(TIMER_BASE + TCR1));} static struct timecounter microblaze_tc = {	.cc = NULL,}; static cycle_t microblaze_cc_read(const struct cyclecounter *cc){	return microblaze_read(NULL);} static struct cyclecounter microblaze_cc = {	.read = microblaze_cc_read,	.mask = CLOCKSOURCE_MASK(32),	.shift = 8,}; static int __init init_microblaze_timecounter(void){	microblaze_cc.mult = div_sc(timer_clock_freq, NSEC_PER_SEC,				microblaze_cc.shift); 	timecounter_init(&microblaze_tc, &microblaze_cc, sched_clock()); 	return 0;} static struct clocksource clocksource_microblaze = {	.name		= "microblaze_clocksource",	.rating		= 300,	.read		= microblaze_read,	.mask		= CLOCKSOURCE_MASK(32),	.shift		= 8, /* I can shift it */	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,}; static int __init microblaze_clocksource_init(void){	clocksource_microblaze.mult =			clocksource_hz2mult(timer_clock_freq,						clocksource_microblaze.shift);	if (clocksource_register(&clocksource_microblaze))		panic("failed to register clocksource"); 	/* stop timer1 */	out_be32(TIMER_BASE + TCSR1, in_be32(TIMER_BASE + TCSR1) & ~TCSR_ENT);	/* start timer1 - up counting without interrupt */	out_be32(TIMER_BASE + TCSR1, TCSR_TINT|TCSR_ENT|TCSR_ARHT); 	/* register timecounter - for ftrace support */	init_microblaze_timecounter();	return 0;} /* * We have to protect accesses before timer initialization * and return 0 for sched_clock function below. */static int timer_initialized; void __init time_init(void){	u32 irq, i = 0;	u32 timer_num = 1;	struct device_node *timer = NULL;	const void *prop;#ifdef CONFIG_SELFMOD_TIMER	unsigned int timer_baseaddr = 0;	int arr_func[] = {				(int)&microblaze_read,				(int)&timer_interrupt,				(int)&microblaze_clocksource_init,				(int)&microblaze_timer_set_mode,				(int)&microblaze_timer_set_next_event,				0			};#endif	const char * const timer_list[] = {		"xlnx,xps-timer-1.00.a",		NULL	}; 	for (i = 0; timer_list[i] != NULL; i++) {		timer = of_find_compatible_node(NULL, NULL, timer_list[i]);		if (timer)			break;	}	BUG_ON(!timer); 	timer_baseaddr = be32_to_cpup(of_get_property(timer, "reg", NULL));	timer_baseaddr = (unsigned long) ioremap(timer_baseaddr, PAGE_SIZE);	irq = be32_to_cpup(of_get_property(timer, "interrupts", NULL));	timer_num = be32_to_cpup(of_get_property(timer,						"xlnx,one-timer-only", NULL));	if (timer_num) {		eprintk(KERN_EMERG "Please enable two timers in HW\n");		BUG();	} #ifdef CONFIG_SELFMOD_TIMER	selfmod_function((int *) arr_func, timer_baseaddr);#endif	printk(KERN_INFO "%s #0 at 0x%08x, irq=%d\n",		timer_list[i], timer_baseaddr, irq); 	/* If there is clock-frequency property than use it */	prop = of_get_property(timer, "clock-frequency", NULL);	if (prop)		timer_clock_freq = be32_to_cpup(prop);	else		timer_clock_freq = cpuinfo.cpu_clock_freq; 	freq_div_hz = timer_clock_freq / HZ; 	setup_irq(irq, &timer_irqaction);#ifdef CONFIG_HEART_BEAT	setup_heartbeat();#endif	microblaze_clocksource_init();	microblaze_clockevent_init();	timer_initialized = 1;} unsigned long long notrace sched_clock(void){	if (timer_initialized) {		struct clocksource *cs = &clocksource_microblaze;		cycle_t cyc = cnt32_to_63(cs->read(NULL));		return clocksource_cyc2ns(cyc, cs->mult, cs->shift);	}	return 0;}