[linux.git] / arch / mips / kernel / cevt-bcm1480.c

/*
 * Copyright (C) 2000,2001,2004 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/percpu.h>
#include <linux/smp.h>
#include <linux/irq.h>

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

#include <asm/sibyte/bcm1480_regs.h>
#include <asm/sibyte/sb1250_regs.h>
#include <asm/sibyte/bcm1480_int.h>
#include <asm/sibyte/bcm1480_scd.h>

#include <asm/sibyte/sb1250.h>

#define IMR_IP2_VAL	K_BCM1480_INT_MAP_I0
#define IMR_IP3_VAL	K_BCM1480_INT_MAP_I1
#define IMR_IP4_VAL	K_BCM1480_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 sb1480_clockevent_init(void)
{
	unsigned int cpu = smp_processor_id();
	unsigned int irq = K_BCM1480_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);

	BUG_ON(cpu > 3);	/* Only have 4 general purpose timers */

	sprintf(name, "bcm1480-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);

	bcm1480_mask_irq(cpu, irq);

	/*
	 * Map the timer interrupt to IP[4] of this cpu
	 */
	__raw_writeq(IMR_IP4_VAL,
		     IOADDR(A_BCM1480_IMR_REGISTER(cpu,
			R_BCM1480_IMR_INTERRUPT_MAP_BASE_H) + (irq << 3)));

	bcm1480_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) 2000,2001,2004 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>
	20	#include <linux/percpu.h>
631330f5	21	#include <linux/smp.h>
ca4d3e67	22	#include <linux/irq.h>
217dd11e RB	23
	24	#include <asm/addrspace.h>
	25	#include <asm/io.h>
	26	#include <asm/time.h>
	27
	28	#include <asm/sibyte/bcm1480_regs.h>
	29	#include <asm/sibyte/sb1250_regs.h>
	30	#include <asm/sibyte/bcm1480_int.h>
	31	#include <asm/sibyte/bcm1480_scd.h>
	32
	33	#include <asm/sibyte/sb1250.h>
	34
	35	#define IMR_IP2_VAL K_BCM1480_INT_MAP_I0
	36	#define IMR_IP3_VAL K_BCM1480_INT_MAP_I1
	37	#define IMR_IP4_VAL K_BCM1480_INT_MAP_I2
	38
	39	/*
	40	* The general purpose timer ticks at 1MHz independent if
	41	* the rest of the system
	42	*/
	43	static void sibyte_set_mode(enum clock_event_mode mode,
70342287	44	struct clock_event_device *evt)
217dd11e RB	45	{
	46	unsigned int cpu = smp_processor_id();
	47	void __iomem cfg, init;
	48
	49	cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
	50	init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
	51
	52	switch (mode) {
	53	case CLOCK_EVT_MODE_PERIODIC:
	54	__raw_writeq(0, cfg);
	55	__raw_writeq((V_SCD_TIMER_FREQ / HZ) - 1, init);
	56	__raw_writeq(M_SCD_TIMER_ENABLE \| M_SCD_TIMER_MODE_CONTINUOUS,
	57	cfg);
	58	break;
	59
	60	case CLOCK_EVT_MODE_ONESHOT:
	61	/* Stop the timer until we actually program a shot */
	62	case CLOCK_EVT_MODE_SHUTDOWN:
	63	__raw_writeq(0, cfg);
	64	break;
	65
	66	case CLOCK_EVT_MODE_UNUSED: /* shuddup gcc */
	67	case CLOCK_EVT_MODE_RESUME:
	68	;
	69	}
	70	}
	71
	72	static int sibyte_next_event(unsigned long delta, struct clock_event_device *cd)
	73	{
	74	unsigned int cpu = smp_processor_id();
	75	void __iomem cfg, init;
	76
	77	cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
	78	init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
	79
8dfa741f	80	__raw_writeq(0, cfg);
217dd11e RB	81	__raw_writeq(delta - 1, init);
	82	__raw_writeq(M_SCD_TIMER_ENABLE, cfg);
	83
	84	return 0;
	85	}
	86
	87	static irqreturn_t sibyte_counter_handler(int irq, void *dev_id)
	88	{
	89	unsigned int cpu = smp_processor_id();
	90	struct clock_event_device *cd = dev_id;
	91	void __iomem *cfg;
	92	unsigned long tmode;
	93
	94	if (cd->mode == CLOCK_EVT_MODE_PERIODIC)
	95	tmode = M_SCD_TIMER_ENABLE \| M_SCD_TIMER_MODE_CONTINUOUS;
	96	else
	97	tmode = 0;
	98
	99	/* ACK interrupt */
	100	cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
	101	____raw_writeq(tmode, cfg);
	102
	103	cd->event_handler(cd);
	104
	105	return IRQ_HANDLED;
	106	}
	107
	108	static DEFINE_PER_CPU(struct clock_event_device, sibyte_hpt_clockevent);
	109	static DEFINE_PER_CPU(struct irqaction, sibyte_hpt_irqaction);
	110	static DEFINE_PER_CPU(char [18], sibyte_hpt_name);
	111
	112	void __cpuinit sb1480_clockevent_init(void)
	113	{
	114	unsigned int cpu = smp_processor_id();
	115	unsigned int irq = K_BCM1480_INT_TIMER_0 + cpu;
	116	struct irqaction *action = &per_cpu(sibyte_hpt_irqaction, cpu);
	117	struct clock_event_device *cd = &per_cpu(sibyte_hpt_clockevent, cpu);
	118	unsigned char *name = per_cpu(sibyte_hpt_name, cpu);
	119
	120	BUG_ON(cpu > 3); /* Only have 4 general purpose timers */
	121
	122	sprintf(name, "bcm1480-counter-%d", cpu);
	123	cd->name = name;
	124	cd->features = CLOCK_EVT_FEAT_PERIODIC \|
	125	CLOCK_EVT_FEAT_ONESHOT;
	126	clockevent_set_clock(cd, V_SCD_TIMER_FREQ);
	127	cd->max_delta_ns = clockevent_delta2ns(0x7fffff, cd);
62247753	128	cd->min_delta_ns = clockevent_delta2ns(2, cd);
217dd11e RB	129	cd->rating = 200;
217dd11e RB	130	cd->irq = irq;
320ab2b0	131	cd->cpumask = cpumask_of(cpu);
217dd11e RB	132	cd->set_next_event = sibyte_next_event;
	133	cd->set_mode = sibyte_set_mode;
	134	clockevents_register_device(cd);
	135
	136	bcm1480_mask_irq(cpu, irq);
	137
	138	/*
	139	* Map the timer interrupt to IP[4] of this cpu
	140	*/
	141	__raw_writeq(IMR_IP4_VAL,
	142	IOADDR(A_BCM1480_IMR_REGISTER(cpu,
	143	R_BCM1480_IMR_INTERRUPT_MAP_BASE_H) + (irq << 3)));
	144
	145	bcm1480_unmask_irq(cpu, irq);
	146
70342287	147	action->handler = sibyte_counter_handler;
8b5690f8	148	action->flags = IRQF_PERCPU \| IRQF_TIMER;
217dd11e RB	149	action->name = name;
217dd11e RB	150	action->dev_id = cd;
07a80e49	151
0de26520	152	irq_set_affinity(irq, cpumask_of(cpu));
217dd11e RB	153	setup_irq(irq, action);
217dd11e RB	154	}