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/*
* arch/sh/kernel/timers/timer-tmu.c - TMU Timer Support
*
* Copyright (C) 2005 - 2007 Paul Mundt
*
* TMU handling code hacked out of arch/sh/kernel/time.c
*
* Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
* Copyright (C) 2002, 2003, 2004 Paul Mundt
* Copyright (C) 2002 M. R. Brown <mrbrown@linux-sh.org>
*
* 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/interrupt.h>
#include <linux/seqlock.h>
#include <linux/clockchips.h>
#include <asm/timer.h>
#include <asm/rtc.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/clock.h>
#define TMU_TOCR_INIT 0x00
#define TMU_TCR_INIT 0x0020
static int tmu_timer_start(void)
{
ctrl_outb(ctrl_inb(TMU_012_TSTR) | 0x3, TMU_012_TSTR);
return 0;
}
static void tmu0_timer_set_interval(unsigned long interval, unsigned int reload)
{
ctrl_outl(interval, TMU0_TCNT);
/*
* TCNT reloads from TCOR on underflow, clear it if we don't
* intend to auto-reload
*/
if (reload)
ctrl_outl(interval, TMU0_TCOR);
else
ctrl_outl(0, TMU0_TCOR);
tmu_timer_start();
}
static int tmu_timer_stop(void)
{
ctrl_outb(ctrl_inb(TMU_012_TSTR) & ~0x3, TMU_012_TSTR);
return 0;
}
static cycle_t tmu_timer_read(void)
{
return ~ctrl_inl(TMU1_TCNT);
}
static int tmu_set_next_event(unsigned long cycles,
struct clock_event_device *evt)
{
tmu0_timer_set_interval(cycles, 1);
return 0;
}
static void tmu_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
ctrl_outl(ctrl_inl(TMU0_TCNT), TMU0_TCOR);
break;
case CLOCK_EVT_MODE_ONESHOT:
ctrl_outl(0, TMU0_TCOR);
break;
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
break;
}
}
static struct clock_event_device tmu0_clockevent = {
.name = "tmu0",
.shift = 32,
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
.set_mode = tmu_set_mode,
.set_next_event = tmu_set_next_event,
};
static irqreturn_t tmu_timer_interrupt(int irq, void *dummy)
{
struct clock_event_device *evt = &tmu0_clockevent;
unsigned long timer_status;
/* Clear UNF bit */
timer_status = ctrl_inw(TMU0_TCR);
timer_status &= ~0x100;
ctrl_outw(timer_status, TMU0_TCR);
evt->event_handler(evt);
return IRQ_HANDLED;
}
static struct irqaction tmu0_irq = {
.name = "periodic timer",
.handler = tmu_timer_interrupt,
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
.mask = CPU_MASK_NONE,
};
static void tmu0_clk_init(struct clk *clk)
{
u8 divisor = TMU_TCR_INIT & 0x7;
ctrl_outw(TMU_TCR_INIT, TMU0_TCR);
clk->rate = clk->parent->rate / (4 << (divisor << 1));
}
static void tmu0_clk_recalc(struct clk *clk)
{
u8 divisor = ctrl_inw(TMU0_TCR) & 0x7;
clk->rate = clk->parent->rate / (4 << (divisor << 1));
}
static struct clk_ops tmu0_clk_ops = {
.init = tmu0_clk_init,
.recalc = tmu0_clk_recalc,
};
static struct clk tmu0_clk = {
.name = "tmu0_clk",
.ops = &tmu0_clk_ops,
};
static void tmu1_clk_init(struct clk *clk)
{
u8 divisor = TMU_TCR_INIT & 0x7;
ctrl_outw(divisor, TMU1_TCR);
clk->rate = clk->parent->rate / (4 << (divisor << 1));
}
static void tmu1_clk_recalc(struct clk *clk)
{
u8 divisor = ctrl_inw(TMU1_TCR) & 0x7;
clk->rate = clk->parent->rate / (4 << (divisor << 1));
}
static struct clk_ops tmu1_clk_ops = {
.init = tmu1_clk_init,
.recalc = tmu1_clk_recalc,
};
static struct clk tmu1_clk = {
.name = "tmu1_clk",
.ops = &tmu1_clk_ops,
};
static int tmu_timer_init(void)
{
unsigned long interval;
unsigned long frequency;
setup_irq(CONFIG_SH_TIMER_IRQ, &tmu0_irq);
tmu0_clk.parent = clk_get(NULL, "module_clk");
tmu1_clk.parent = clk_get(NULL, "module_clk");
tmu_timer_stop();
#if !defined(CONFIG_CPU_SUBTYPE_SH7300) && \
!defined(CONFIG_CPU_SUBTYPE_SH7760) && \
!defined(CONFIG_CPU_SUBTYPE_SH7785) && \
!defined(CONFIG_CPU_SUBTYPE_SHX3)
ctrl_outb(TMU_TOCR_INIT, TMU_TOCR);
#endif
clk_register(&tmu0_clk);
clk_register(&tmu1_clk);
clk_enable(&tmu0_clk);
clk_enable(&tmu1_clk);
frequency = clk_get_rate(&tmu0_clk);
interval = (frequency + HZ / 2) / HZ;
sh_hpt_frequency = clk_get_rate(&tmu1_clk);
ctrl_outl(~0, TMU1_TCNT);
ctrl_outl(~0, TMU1_TCOR);
tmu0_timer_set_interval(interval, 1);
tmu0_clockevent.mult = div_sc(frequency, NSEC_PER_SEC,
tmu0_clockevent.shift);
tmu0_clockevent.max_delta_ns =
clockevent_delta2ns(-1, &tmu0_clockevent);
tmu0_clockevent.min_delta_ns =
clockevent_delta2ns(1, &tmu0_clockevent);
tmu0_clockevent.cpumask = cpumask_of_cpu(0);
clockevents_register_device(&tmu0_clockevent);
return 0;
}
struct sys_timer_ops tmu_timer_ops = {
.init = tmu_timer_init,
.start = tmu_timer_start,
.stop = tmu_timer_stop,
.read = tmu_timer_read,
};
struct sys_timer tmu_timer = {
.name = "tmu",
.ops = &tmu_timer_ops,
};
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