[mirror_ubuntu-artful-kernel.git] / arch / mips / sgi-ip27 / ip27-timer.c

/*
 * Copytight (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org)
 * Copytight (C) 1999, 2000 Silicon Graphics, Inc.
 */
#include <linux/bcd.h>
#include <linux/clockchips.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/param.h>
#include <linux/smp.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <linux/mm.h>
#include <linux/platform_device.h>

#include <asm/time.h>
#include <asm/pgtable.h>
#include <asm/sgialib.h>
#include <asm/sn/ioc3.h>
#include <asm/sn/klconfig.h>
#include <asm/sn/arch.h>
#include <asm/sn/addrs.h>
#include <asm/sn/sn_private.h>
#include <asm/sn/sn0/ip27.h>
#include <asm/sn/sn0/hub.h>

#define TICK_SIZE (tick_nsec / 1000)

/* Includes for ioc3_init().  */
#include <asm/sn/types.h>
#include <asm/sn/sn0/addrs.h>
#include <asm/sn/sn0/hubni.h>
#include <asm/sn/sn0/hubio.h>
#include <asm/pci/bridge.h>

static void enable_rt_irq(struct irq_data *d)
{
}

static void disable_rt_irq(struct irq_data *d)
{
}

static struct irq_chip rt_irq_type = {
	.name		= "SN HUB RT timer",
	.irq_mask	= disable_rt_irq,
	.irq_unmask	= enable_rt_irq,
};

static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
{
	unsigned int cpu = smp_processor_id();
	int slice = cputoslice(cpu);
	unsigned long cnt;

	cnt = LOCAL_HUB_L(PI_RT_COUNT);
	cnt += delta;
	LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt);

	return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
}

static void rt_set_mode(enum clock_event_mode mode,
		struct clock_event_device *evt)
{
	/* Nothing to do ...  */
}

int rt_timer_irq;

static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
static DEFINE_PER_CPU(char [11], hub_rt_name);

static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
{
	unsigned int cpu = smp_processor_id();
	struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
	int slice = cputoslice(cpu);

	/*
	 * Ack
	 */
	LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0);
	cd->event_handler(cd);

	return IRQ_HANDLED;
}

struct irqaction hub_rt_irqaction = {
	.handler	= hub_rt_counter_handler,
	.flags		= IRQF_PERCPU | IRQF_TIMER,
	.name		= "hub-rt",
};

/*
 * This is a hack; we really need to figure these values out dynamically
 *
 * Since 800 ns works very well with various HUB frequencies, such as
 * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
 *
 * Ralf: which clock rate is used to feed the counter?
 */
#define NSEC_PER_CYCLE		800
#define CYCLES_PER_SEC		(NSEC_PER_SEC / NSEC_PER_CYCLE)

void __cpuinit hub_rt_clock_event_init(void)
{
	unsigned int cpu = smp_processor_id();
	struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
	unsigned char *name = per_cpu(hub_rt_name, cpu);
	int irq = rt_timer_irq;

	sprintf(name, "hub-rt %d", cpu);
	cd->name		= name;
	cd->features		= CLOCK_EVT_FEAT_ONESHOT;
	clockevent_set_clock(cd, CYCLES_PER_SEC);
	cd->max_delta_ns	= clockevent_delta2ns(0xfffffffffffff, cd);
	cd->min_delta_ns	= clockevent_delta2ns(0x300, cd);
	cd->rating		= 200;
	cd->irq			= irq;
	cd->cpumask		= cpumask_of(cpu);
	cd->set_next_event	= rt_next_event;
	cd->set_mode		= rt_set_mode;
	clockevents_register_device(cd);
}

static void __init hub_rt_clock_event_global_init(void)
{
	int irq;

	do {
		smp_wmb();
		irq = rt_timer_irq;
		if (irq)
			break;

		irq = allocate_irqno();
		if (irq < 0)
			panic("Allocation of irq number for timer failed");
	} while (xchg(&rt_timer_irq, irq));

	irq_set_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq);
	setup_irq(irq, &hub_rt_irqaction);
}

static cycle_t hub_rt_read(struct clocksource *cs)
{
	return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
}

struct clocksource hub_rt_clocksource = {
	.name	= "HUB-RT",
	.rating = 200,
	.read	= hub_rt_read,
	.mask	= CLOCKSOURCE_MASK(52),
	.flags	= CLOCK_SOURCE_IS_CONTINUOUS,
};

static void __init hub_rt_clocksource_init(void)
{
	struct clocksource *cs = &hub_rt_clocksource;

	clocksource_register_hz(cs, CYCLES_PER_SEC);
}

void __init plat_time_init(void)
{
	hub_rt_clocksource_init();
	hub_rt_clock_event_global_init();
	hub_rt_clock_event_init();
}

void __cpuinit cpu_time_init(void)
{
	lboard_t *board;
	klcpu_t *cpu;
	int cpuid;

	/* Don't use ARCS.  ARCS is fragile.  Klconfig is simple and sane.  */
	board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27);
	if (!board)
		panic("Can't find board info for myself.");

	cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX;
	cpu = (klcpu_t *) KLCF_COMP(board, cpuid);
	if (!cpu)
		panic("No information about myself?");

	printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed);

	set_c0_status(SRB_TIMOCLK);
}

void __cpuinit hub_rtc_init(cnodeid_t cnode)
{

	/*
	 * We only need to initialize the current node.
	 * If this is not the current node then it is a cpuless
	 * node and timeouts will not happen there.
	 */
	if (get_compact_nodeid() == cnode) {
		LOCAL_HUB_S(PI_RT_EN_A, 1);
		LOCAL_HUB_S(PI_RT_EN_B, 1);
		LOCAL_HUB_S(PI_PROF_EN_A, 0);
		LOCAL_HUB_S(PI_PROF_EN_B, 0);
		LOCAL_HUB_S(PI_RT_COUNT, 0);
		LOCAL_HUB_S(PI_RT_PEND_A, 0);
		LOCAL_HUB_S(PI_RT_PEND_B, 0);
	}
}

static int __init sgi_ip27_rtc_devinit(void)
{
	struct resource res;

	memset(&res, 0, sizeof(res));
	res.start = XPHYSADDR(KL_CONFIG_CH_CONS_INFO(master_nasid)->memory_base +
			      IOC3_BYTEBUS_DEV0);
	res.end = res.start + 32767;
	res.flags = IORESOURCE_MEM;

	return IS_ERR(platform_device_register_simple("rtc-m48t35", -1,
						      &res, 1));
}

/*
 * kludge make this a device_initcall after ioc3 resource conflicts
 * are resolved
 */
late_initcall(sgi_ip27_rtc_devinit);
Commit	Line	Data
1da177e4	1	/*
54d0a216	2	* Copytight (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org)
1da177e4 LT	3	* Copytight (C) 1999, 2000 Silicon Graphics, Inc.
	4	*/
	5	#include <linux/bcd.h>
e887b245	6	#include <linux/clockchips.h>
1da177e4 LT	7	#include <linux/init.h>
	8	#include <linux/kernel.h>
	9	#include <linux/sched.h>
	10	#include <linux/interrupt.h>
	11	#include <linux/kernel_stat.h>
	12	#include <linux/param.h>
631330f5	13	#include <linux/smp.h>
1da177e4 LT	14	#include <linux/time.h>
	15	#include <linux/timex.h>
	16	#include <linux/mm.h>
3ec066cd	17	#include <linux/platform_device.h>
1da177e4 LT	18
	19	#include <asm/time.h>
	20	#include <asm/pgtable.h>
	21	#include <asm/sgialib.h>
	22	#include <asm/sn/ioc3.h>
1da177e4 LT	23	#include <asm/sn/klconfig.h>
	24	#include <asm/sn/arch.h>
	25	#include <asm/sn/addrs.h>
	26	#include <asm/sn/sn_private.h>
	27	#include <asm/sn/sn0/ip27.h>
	28	#include <asm/sn/sn0/hub.h>
	29
1da177e4 LT	30	#define TICK_SIZE (tick_nsec / 1000)
1da177e4 LT	31
1da177e4 LT	32	/* Includes for ioc3_init(). */
	33	#include <asm/sn/types.h>
	34	#include <asm/sn/sn0/addrs.h>
	35	#include <asm/sn/sn0/hubni.h>
	36	#include <asm/sn/sn0/hubio.h>
	37	#include <asm/pci/bridge.h>
	38
301218df	39	static void enable_rt_irq(struct irq_data *d)
06d428d7 RB	40	{
	41	}
	42
301218df	43	static void disable_rt_irq(struct irq_data *d)
06d428d7 RB	44	{
	45	}
	46
	47	static struct irq_chip rt_irq_type = {
	48	.name = "SN HUB RT timer",
301218df TG	49	.irq_mask = disable_rt_irq,
301218df TG	50	.irq_unmask = enable_rt_irq,
06d428d7 RB	51	};
	52
	53	static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
e887b245 RB	54	{
e887b245 RB	55	unsigned int cpu = smp_processor_id();
c8925297	56	int slice = cputoslice(cpu);
e887b245 RB	57	unsigned long cnt;
	58
	59	cnt = LOCAL_HUB_L(PI_RT_COUNT);
	60	cnt += delta;
725d7b36	61	LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt);
e887b245 RB	62
	63	return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
	64	}
	65
	66	static void rt_set_mode(enum clock_event_mode mode,
	67	struct clock_event_device *evt)
	68	{
4f0ad950	69	/* Nothing to do ... */
e887b245 RB	70	}
e887b245 RB	71
d0e7ba06	72	int rt_timer_irq;
e887b245	73
b32bb803 TB	74	static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
	75	static DEFINE_PER_CPU(char [11], hub_rt_name);
	76
06d428d7	77	static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
e887b245	78	{
e887b245	79	unsigned int cpu = smp_processor_id();
b32bb803	80	struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
725d7b36	81	int slice = cputoslice(cpu);
e887b245	82
725d7b36 RB	83	/*
	84	* Ack
	85	*/
c8925297	86	LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0);
e887b245 RB	87	cd->event_handler(cd);
	88
	89	return IRQ_HANDLED;
	90	}
	91
06d428d7 RB	92	struct irqaction hub_rt_irqaction = {
06d428d7 RB	93	.handler = hub_rt_counter_handler,
8b5690f8	94	.flags = IRQF_PERCPU \| IRQF_TIMER,
06d428d7	95	.name = "hub-rt",
3c009442 RB	96	};
3c009442 RB	97
e887b245 RB	98	/*
	99	* This is a hack; we really need to figure these values out dynamically
	100	*
	101	* Since 800 ns works very well with various HUB frequencies, such as
	102	* 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
	103	*
	104	* Ralf: which clock rate is used to feed the counter?
	105	*/
	106	#define NSEC_PER_CYCLE 800
	107	#define CYCLES_PER_SEC (NSEC_PER_SEC / NSEC_PER_CYCLE)
	108
b32bb803	109	void __cpuinit hub_rt_clock_event_init(void)
1da177e4	110	{
e887b245	111	unsigned int cpu = smp_processor_id();
06d428d7 RB	112	struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
	113	unsigned char *name = per_cpu(hub_rt_name, cpu);
	114	int irq = rt_timer_irq;
	115
	116	sprintf(name, "hub-rt %d", cpu);
b32bb803 TB	117	cd->name = name;
b32bb803 TB	118	cd->features = CLOCK_EVT_FEAT_ONESHOT;
06d428d7	119	clockevent_set_clock(cd, CYCLES_PER_SEC);
70342287 RB	120	cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd);
70342287 RB	121	cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
b32bb803 TB	122	cd->rating = 200;
b32bb803 TB	123	cd->irq = irq;
320ab2b0	124	cd->cpumask = cpumask_of(cpu);
b32bb803 TB	125	cd->set_next_event = rt_next_event;
b32bb803 TB	126	cd->set_mode = rt_set_mode;
e887b245	127	clockevents_register_device(cd);
06d428d7 RB	128	}
	129
	130	static void __init hub_rt_clock_event_global_init(void)
	131	{
d0e7ba06	132	int irq;
06d428d7 RB	133
	134	do {
	135	smp_wmb();
	136	irq = rt_timer_irq;
	137	if (irq)
	138	break;
	139
	140	irq = allocate_irqno();
	141	if (irq < 0)
	142	panic("Allocation of irq number for timer failed");
	143	} while (xchg(&rt_timer_irq, irq));
e887b245	144
e4ec7989	145	irq_set_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq);
06d428d7	146	setup_irq(irq, &hub_rt_irqaction);
1da177e4 LT	147	}
1da177e4 LT	148
8e19608e	149	static cycle_t hub_rt_read(struct clocksource *cs)
16b7b2ac AN	150	{
	151	return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
	152	}
	153
06d428d7	154	struct clocksource hub_rt_clocksource = {
e887b245	155	.name = "HUB-RT",
70342287	156	.rating = 200,
87b2335d RB	157	.read = hub_rt_read,
87b2335d RB	158	.mask = CLOCKSOURCE_MASK(52),
87b2335d RB	159	.flags = CLOCK_SOURCE_IS_CONTINUOUS,
	160	};
	161
06d428d7	162	static void __init hub_rt_clocksource_init(void)
1da177e4	163	{
06d428d7 RB	164	struct clocksource *cs = &hub_rt_clocksource;
06d428d7 RB	165
75c4fd8c	166	clocksource_register_hz(cs, CYCLES_PER_SEC);
1da177e4 LT	167	}
1da177e4 LT	168
e887b245 RB	169	void __init plat_time_init(void)
e887b245 RB	170	{
06d428d7 RB	171	hub_rt_clocksource_init();
06d428d7 RB	172	hub_rt_clock_event_global_init();
b32bb803	173	hub_rt_clock_event_init();
e887b245 RB	174	}
e887b245 RB	175
06d428d7	176	void __cpuinit cpu_time_init(void)
1da177e4 LT	177	{
	178	lboard_t *board;
	179	klcpu_t *cpu;
	180	int cpuid;
	181
	182	/* Don't use ARCS. ARCS is fragile. Klconfig is simple and sane. */
	183	board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27);
	184	if (!board)
	185	panic("Can't find board info for myself.");
	186
	187	cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX;
	188	cpu = (klcpu_t *) KLCF_COMP(board, cpuid);
	189	if (!cpu)
	190	panic("No information about myself?");
	191
	192	printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed);
	193
	194	set_c0_status(SRB_TIMOCLK);
	195	}
	196
234fcd14	197	void __cpuinit hub_rtc_init(cnodeid_t cnode)
1da177e4	198	{
3ec066cd	199
1da177e4 LT	200	/*
	201	* We only need to initialize the current node.
	202	* If this is not the current node then it is a cpuless
	203	* node and timeouts will not happen there.
	204	*/
	205	if (get_compact_nodeid() == cnode) {
1da177e4 LT	206	LOCAL_HUB_S(PI_RT_EN_A, 1);
	207	LOCAL_HUB_S(PI_RT_EN_B, 1);
	208	LOCAL_HUB_S(PI_PROF_EN_A, 0);
	209	LOCAL_HUB_S(PI_PROF_EN_B, 0);
1da177e4 LT	210	LOCAL_HUB_S(PI_RT_COUNT, 0);
1da177e4 LT	211	LOCAL_HUB_S(PI_RT_PEND_A, 0);
1da177e4 LT	212	LOCAL_HUB_S(PI_RT_PEND_B, 0);
	213	}
	214	}
3ec066cd TB	215
	216	static int __init sgi_ip27_rtc_devinit(void)
	217	{
	218	struct resource res;
	219
	220	memset(&res, 0, sizeof(res));
	221	res.start = XPHYSADDR(KL_CONFIG_CH_CONS_INFO(master_nasid)->memory_base +
	222	IOC3_BYTEBUS_DEV0);
	223	res.end = res.start + 32767;
	224	res.flags = IORESOURCE_MEM;
	225
	226	return IS_ERR(platform_device_register_simple("rtc-m48t35", -1,
	227	&res, 1));
	228	}
	229
	230	/*
	231	* kludge make this a device_initcall after ioc3 resource conflicts
	232	* are resolved
	233	*/
	234	late_initcall(sgi_ip27_rtc_devinit);