[linux.git] / arch / mips / kernel / cevt-sb1250.c

/*
 * Copyright (C) 2000, 2001 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
#include <linux/clockchips.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/percpu.h>
#include <linux/smp.h>

#include <asm/addrspace.h>
#include <asm/io.h>
#include <asm/time.h>

#include <asm/sibyte/sb1250.h>
#include <asm/sibyte/sb1250_regs.h>
#include <asm/sibyte/sb1250_int.h>
#include <asm/sibyte/sb1250_scd.h>

#define IMR_IP2_VAL	K_INT_MAP_I0
#define IMR_IP3_VAL	K_INT_MAP_I1
#define IMR_IP4_VAL	K_INT_MAP_I2

/*
 * The general purpose timer ticks at 1MHz independent if
 * the rest of the system
 */
static void sibyte_set_mode(enum clock_event_mode mode,
			   struct clock_event_device *evt)
{
	unsigned int cpu = smp_processor_id();
	void __iomem *cfg, *init;

	cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
	init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));

	switch (mode) {
	case CLOCK_EVT_MODE_PERIODIC:
		__raw_writeq(0, cfg);
		__raw_writeq((V_SCD_TIMER_FREQ / HZ) - 1, init);
		__raw_writeq(M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS,
			     cfg);
		break;

	case CLOCK_EVT_MODE_ONESHOT:
		/* Stop the timer until we actually program a shot */
	case CLOCK_EVT_MODE_SHUTDOWN:
		__raw_writeq(0, cfg);
		break;

	case CLOCK_EVT_MODE_UNUSED:	/* shuddup gcc */
	case CLOCK_EVT_MODE_RESUME:
		;
	}
}

static int sibyte_next_event(unsigned long delta, struct clock_event_device *cd)
{
	unsigned int cpu = smp_processor_id();
	void __iomem *cfg, *init;

	cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
	init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));

	__raw_writeq(0, cfg);
	__raw_writeq(delta - 1, init);
	__raw_writeq(M_SCD_TIMER_ENABLE, cfg);

	return 0;
}

static irqreturn_t sibyte_counter_handler(int irq, void *dev_id)
{
	unsigned int cpu = smp_processor_id();
	struct clock_event_device *cd = dev_id;
	void __iomem *cfg;
	unsigned long tmode;

	if (cd->mode == CLOCK_EVT_MODE_PERIODIC)
		tmode = M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS;
	else
		tmode = 0;

	/* ACK interrupt */
	cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
	____raw_writeq(tmode, cfg);

	cd->event_handler(cd);

	return IRQ_HANDLED;
}

static DEFINE_PER_CPU(struct clock_event_device, sibyte_hpt_clockevent);
static DEFINE_PER_CPU(struct irqaction, sibyte_hpt_irqaction);
static DEFINE_PER_CPU(char [18], sibyte_hpt_name);

void __cpuinit sb1250_clockevent_init(void)
{
	unsigned int cpu = smp_processor_id();
	unsigned int irq = K_INT_TIMER_0 + cpu;
	struct irqaction *action = &per_cpu(sibyte_hpt_irqaction, cpu);
	struct clock_event_device *cd = &per_cpu(sibyte_hpt_clockevent, cpu);
	unsigned char *name = per_cpu(sibyte_hpt_name, cpu);

	/* Only have 4 general purpose timers, and we use last one as hpt */
	BUG_ON(cpu > 2);

	sprintf(name, "sb1250-counter-%d", cpu);
	cd->name		= name;
	cd->features		= CLOCK_EVT_FEAT_PERIODIC |
				  CLOCK_EVT_FEAT_ONESHOT;
	clockevent_set_clock(cd, V_SCD_TIMER_FREQ);
	cd->max_delta_ns	= clockevent_delta2ns(0x7fffff, cd);
	cd->min_delta_ns	= clockevent_delta2ns(2, cd);
	cd->rating		= 200;
	cd->irq			= irq;
	cd->cpumask		= cpumask_of(cpu);
	cd->set_next_event	= sibyte_next_event;
	cd->set_mode		= sibyte_set_mode;
	clockevents_register_device(cd);

	sb1250_mask_irq(cpu, irq);

	/*
	 * Map the timer interrupt to IP[4] of this cpu
	 */
	__raw_writeq(IMR_IP4_VAL,
		     IOADDR(A_IMR_REGISTER(cpu, R_IMR_INTERRUPT_MAP_BASE) +
			    (irq << 3)));

	sb1250_unmask_irq(cpu, irq);

	action->handler = sibyte_counter_handler;
	action->flags	= IRQF_PERCPU | IRQF_TIMER;
	action->name	= name;
	action->dev_id	= cd;

	irq_set_affinity(irq, cpumask_of(cpu));
	setup_irq(irq, action);
}
Commit	Line	Data
217dd11e RB	1	/*
	2	* Copyright (C) 2000, 2001 Broadcom Corporation
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version 2
	7	* of the License, or (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	17	*/
	18	#include <linux/clockchips.h>
	19	#include <linux/interrupt.h>
ca4d3e67	20	#include <linux/irq.h>
217dd11e	21	#include <linux/percpu.h>
631330f5	22	#include <linux/smp.h>
217dd11e RB	23
	24	#include <asm/addrspace.h>
	25	#include <asm/io.h>
	26	#include <asm/time.h>
	27
	28	#include <asm/sibyte/sb1250.h>
	29	#include <asm/sibyte/sb1250_regs.h>
	30	#include <asm/sibyte/sb1250_int.h>
	31	#include <asm/sibyte/sb1250_scd.h>
	32
	33	#define IMR_IP2_VAL K_INT_MAP_I0
	34	#define IMR_IP3_VAL K_INT_MAP_I1
	35	#define IMR_IP4_VAL K_INT_MAP_I2
	36
	37	/*
	38	* The general purpose timer ticks at 1MHz independent if
	39	* the rest of the system
	40	*/
	41	static void sibyte_set_mode(enum clock_event_mode mode,
70342287	42	struct clock_event_device *evt)
217dd11e RB	43	{
	44	unsigned int cpu = smp_processor_id();
	45	void __iomem cfg, init;
	46
	47	cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
	48	init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
	49
	50	switch (mode) {
	51	case CLOCK_EVT_MODE_PERIODIC:
	52	__raw_writeq(0, cfg);
	53	__raw_writeq((V_SCD_TIMER_FREQ / HZ) - 1, init);
	54	__raw_writeq(M_SCD_TIMER_ENABLE \| M_SCD_TIMER_MODE_CONTINUOUS,
	55	cfg);
	56	break;
	57
	58	case CLOCK_EVT_MODE_ONESHOT:
	59	/* Stop the timer until we actually program a shot */
	60	case CLOCK_EVT_MODE_SHUTDOWN:
	61	__raw_writeq(0, cfg);
	62	break;
	63
	64	case CLOCK_EVT_MODE_UNUSED: /* shuddup gcc */
	65	case CLOCK_EVT_MODE_RESUME:
	66	;
	67	}
	68	}
	69
	70	static int sibyte_next_event(unsigned long delta, struct clock_event_device *cd)
	71	{
	72	unsigned int cpu = smp_processor_id();
	73	void __iomem cfg, init;
	74
	75	cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
	76	init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
	77
8dfa741f	78	__raw_writeq(0, cfg);
217dd11e RB	79	__raw_writeq(delta - 1, init);
	80	__raw_writeq(M_SCD_TIMER_ENABLE, cfg);
	81
	82	return 0;
	83	}
	84
	85	static irqreturn_t sibyte_counter_handler(int irq, void *dev_id)
	86	{
	87	unsigned int cpu = smp_processor_id();
	88	struct clock_event_device *cd = dev_id;
	89	void __iomem *cfg;
	90	unsigned long tmode;
	91
	92	if (cd->mode == CLOCK_EVT_MODE_PERIODIC)
	93	tmode = M_SCD_TIMER_ENABLE \| M_SCD_TIMER_MODE_CONTINUOUS;
	94	else
	95	tmode = 0;
	96
	97	/* ACK interrupt */
	98	cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
	99	____raw_writeq(tmode, cfg);
	100
	101	cd->event_handler(cd);
	102
	103	return IRQ_HANDLED;
	104	}
	105
	106	static DEFINE_PER_CPU(struct clock_event_device, sibyte_hpt_clockevent);
	107	static DEFINE_PER_CPU(struct irqaction, sibyte_hpt_irqaction);
	108	static DEFINE_PER_CPU(char [18], sibyte_hpt_name);
	109
	110	void __cpuinit sb1250_clockevent_init(void)
	111	{
	112	unsigned int cpu = smp_processor_id();
	113	unsigned int irq = K_INT_TIMER_0 + cpu;
	114	struct irqaction *action = &per_cpu(sibyte_hpt_irqaction, cpu);
	115	struct clock_event_device *cd = &per_cpu(sibyte_hpt_clockevent, cpu);
	116	unsigned char *name = per_cpu(sibyte_hpt_name, cpu);
	117
	118	/* Only have 4 general purpose timers, and we use last one as hpt */
	119	BUG_ON(cpu > 2);
	120
	121	sprintf(name, "sb1250-counter-%d", cpu);
	122	cd->name = name;
	123	cd->features = CLOCK_EVT_FEAT_PERIODIC \|
	124	CLOCK_EVT_FEAT_ONESHOT;
	125	clockevent_set_clock(cd, V_SCD_TIMER_FREQ);
	126	cd->max_delta_ns = clockevent_delta2ns(0x7fffff, cd);
62247753	127	cd->min_delta_ns = clockevent_delta2ns(2, cd);
217dd11e RB	128	cd->rating = 200;
217dd11e RB	129	cd->irq = irq;
320ab2b0	130	cd->cpumask = cpumask_of(cpu);
217dd11e RB	131	cd->set_next_event = sibyte_next_event;
	132	cd->set_mode = sibyte_set_mode;
	133	clockevents_register_device(cd);
	134
	135	sb1250_mask_irq(cpu, irq);
	136
	137	/*
	138	* Map the timer interrupt to IP[4] of this cpu
	139	*/
	140	__raw_writeq(IMR_IP4_VAL,
	141	IOADDR(A_IMR_REGISTER(cpu, R_IMR_INTERRUPT_MAP_BASE) +
	142	(irq << 3)));
	143
	144	sb1250_unmask_irq(cpu, irq);
	145
70342287	146	action->handler = sibyte_counter_handler;
8b5690f8	147	action->flags = IRQF_PERCPU \| IRQF_TIMER;
217dd11e RB	148	action->name = name;
217dd11e RB	149	action->dev_id = cd;
07a80e49	150
0de26520	151	irq_set_affinity(irq, cpumask_of(cpu));
217dd11e RB	152	setup_irq(irq, action);
217dd11e RB	153	}