freebsd-dev/sys/arm/mv/timer.c

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/*-
* Copyright (c) 2006 Benno Rice.
* Copyright (C) 2007-2008 MARVELL INTERNATIONAL LTD.
* All rights reserved.
*
* Adapted to Marvell SoC by Semihalf.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* from: FreeBSD: //depot/projects/arm/src/sys/arm/xscale/pxa2x0/pxa2x0_timer.c, rev 1
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <sys/timetc.h>
#include <sys/watchdog.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/frame.h>
#include <machine/intr.h>
#include <arm/mv/mvreg.h>
#include <arm/mv/mvvar.h>
#define MV_TIMER_TICK (get_tclk() / hz)
#define INITIAL_TIMECOUNTER (0xffffffff)
#define MAX_WATCHDOG_TICKS (0xffffffff)
struct mv_timer_softc {
struct resource * timer_res[2];
bus_space_tag_t timer_bst;
bus_space_handle_t timer_bsh;
struct mtx timer_mtx;
};
static struct resource_spec mv_timer_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
{ SYS_RES_IRQ, 0, RF_ACTIVE },
{ -1, 0 }
};
static struct mv_timer_softc *timer_softc = NULL;
static int timers_initialized = 0;
static int mv_timer_probe(device_t);
static int mv_timer_attach(device_t);
static int mv_hardclock(void *);
static unsigned mv_timer_get_timecount(struct timecounter *);
static uint32_t mv_get_timer_control(void);
static void mv_set_timer_control(uint32_t);
static uint32_t mv_get_timer(uint32_t);
static void mv_set_timer(uint32_t, uint32_t);
static void mv_set_timer_rel(uint32_t, uint32_t);
static void mv_watchdog_enable(void);
static void mv_watchdog_disable(void);
static void mv_watchdog_event(void *, unsigned int, int *);
static void mv_setup_timer(void);
static void mv_setup_timercount(void);
static struct timecounter mv_timer_timecounter = {
.tc_get_timecount = mv_timer_get_timecount,
.tc_name = "CPU Timer",
.tc_frequency = 0, /* This is assigned on the fly in the init sequence */
.tc_counter_mask = ~0u,
.tc_quality = 1000,
};
static int
mv_timer_probe(device_t dev)
{
device_set_desc(dev, "Marvell CPU Timer");
return (0);
}
static int
mv_timer_attach(device_t dev)
{
int error;
void *ihl;
struct mv_timer_softc *sc;
if (timer_softc != NULL)
return (ENXIO);
sc = (struct mv_timer_softc *)device_get_softc(dev);
timer_softc = sc;
error = bus_alloc_resources(dev, mv_timer_spec, sc->timer_res);
if (error) {
device_printf(dev, "could not allocate resources\n");
return (ENXIO);
}
sc->timer_bst = rman_get_bustag(sc->timer_res[0]);
sc->timer_bsh = rman_get_bushandle(sc->timer_res[0]);
mtx_init(&timer_softc->timer_mtx, "watchdog", NULL, MTX_DEF);
mv_watchdog_disable();
EVENTHANDLER_REGISTER(watchdog_list, mv_watchdog_event, sc, 0);
if (bus_setup_intr(dev, sc->timer_res[1], INTR_TYPE_CLK,
mv_hardclock, NULL, NULL, &ihl) != 0) {
bus_release_resources(dev, mv_timer_spec, sc->timer_res);
device_printf(dev, "could not setup hardclock interrupt\n");
return (ENXIO);
}
mv_setup_timercount();
timers_initialized = 1;
return (0);
}
static int
mv_hardclock(void *arg)
{
uint32_t irq_cause;
struct trapframe *frame;
frame = (struct trapframe *)arg;
hardclock(TRAPF_USERMODE(frame), TRAPF_PC(frame));
irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE);
irq_cause &= ~(IRQ_TIMER0);
write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause);
return (FILTER_HANDLED);
}
static device_method_t mv_timer_methods[] = {
DEVMETHOD(device_probe, mv_timer_probe),
DEVMETHOD(device_attach, mv_timer_attach),
{ 0, 0 }
};
static driver_t mv_timer_driver = {
"timer",
mv_timer_methods,
sizeof(struct mv_timer_softc),
};
static devclass_t mv_timer_devclass;
DRIVER_MODULE(timer, mbus, mv_timer_driver, mv_timer_devclass, 0, 0);
static unsigned
mv_timer_get_timecount(struct timecounter *tc)
{
return (INITIAL_TIMECOUNTER - mv_get_timer(1));
}
void
cpu_initclocks(void)
{
uint32_t irq_cause, irq_mask;
mv_setup_timer();
irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE);
irq_cause &= ~(IRQ_TIMER0);
write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause);
irq_mask = read_cpu_ctrl(BRIDGE_IRQ_MASK);
irq_mask |= IRQ_TIMER0_MASK;
write_cpu_ctrl(BRIDGE_IRQ_MASK, irq_mask);
mv_timer_timecounter.tc_frequency = get_tclk();
tc_init(&mv_timer_timecounter);
}
void
cpu_startprofclock(void)
{
}
void
cpu_stopprofclock(void)
{
}
void
DELAY(int usec)
{
uint32_t val, val_temp;
int32_t nticks;
if (!timers_initialized) {
for (; usec > 0; usec--)
for (val = 100; val > 0; val--)
;
return;
}
val = mv_get_timer(1);
nticks = ((get_tclk() / 1000000 + 1) * usec);
while (nticks > 0) {
val_temp = mv_get_timer(1);
if (val > val_temp)
nticks -= (val - val_temp);
else
nticks -= (val + (INITIAL_TIMECOUNTER - val_temp));
val = val_temp;
}
}
static uint32_t
mv_get_timer_control(void)
{
return (bus_space_read_4(timer_softc->timer_bst,
timer_softc->timer_bsh, CPU_TIMER_CONTROL));
}
static void
mv_set_timer_control(uint32_t val)
{
bus_space_write_4(timer_softc->timer_bst,
timer_softc->timer_bsh, CPU_TIMER_CONTROL, val);
}
static uint32_t
mv_get_timer(uint32_t timer)
{
return (bus_space_read_4(timer_softc->timer_bst,
timer_softc->timer_bsh, CPU_TIMER0 + timer * 0x8));
}
static void
mv_set_timer(uint32_t timer, uint32_t val)
{
bus_space_write_4(timer_softc->timer_bst,
timer_softc->timer_bsh, CPU_TIMER0 + timer * 0x8, val);
}
static void
mv_set_timer_rel(uint32_t timer, uint32_t val)
{
bus_space_write_4(timer_softc->timer_bst,
timer_softc->timer_bsh, CPU_TIMER0_REL + timer * 0x8, val);
}
static void
mv_watchdog_enable(void)
{
uint32_t val;
uint32_t irq_cause, irq_mask;
irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE);
irq_cause &= ~(IRQ_TIMER_WD);
write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause);
irq_mask = read_cpu_ctrl(BRIDGE_IRQ_MASK);
irq_mask |= IRQ_TIMER_WD_MASK;
write_cpu_ctrl(BRIDGE_IRQ_MASK, irq_mask);
val = read_cpu_ctrl(RSTOUTn_MASK);
val |= WD_RST_OUT_EN;
write_cpu_ctrl(RSTOUTn_MASK, val);
val = mv_get_timer_control();
val |= CPU_TIMER_WD_EN | CPU_TIMER_WD_AUTO;
mv_set_timer_control(val);
}
static void
mv_watchdog_disable(void)
{
uint32_t val;
uint32_t irq_cause, irq_mask;
val = mv_get_timer_control();
val &= ~(CPU_TIMER_WD_EN | CPU_TIMER_WD_AUTO);
mv_set_timer_control(val);
val = read_cpu_ctrl(RSTOUTn_MASK);
val &= ~WD_RST_OUT_EN;
write_cpu_ctrl(RSTOUTn_MASK, val);
irq_mask = read_cpu_ctrl(BRIDGE_IRQ_MASK);
irq_mask &= ~(IRQ_TIMER_WD_MASK);
write_cpu_ctrl(BRIDGE_IRQ_MASK, irq_mask);
irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE);
irq_cause &= ~(IRQ_TIMER_WD);
write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause);
}
/*
* Watchdog event handler.
*/
static void
mv_watchdog_event(void *arg, unsigned int cmd, int *error)
{
uint64_t ns;
uint64_t ticks;
mtx_lock(&timer_softc->timer_mtx);
if (cmd == 0)
mv_watchdog_disable();
else {
/*
* Watchdog timeout is in nanosecs, calculation according to
* watchdog(9)
*/
ns = (uint64_t)1 << (cmd & WD_INTERVAL);
ticks = (uint64_t)(ns * get_tclk()) / 1000000000;
if (ticks > MAX_WATCHDOG_TICKS)
mv_watchdog_disable();
else {
/* Timer 2 is the watchdog */
mv_set_timer(2, ticks);
mv_watchdog_enable();
*error = 0;
}
}
mtx_unlock(&timer_softc->timer_mtx);
}
static void
mv_setup_timer(void)
{
uint32_t val;
mv_set_timer_rel(0, MV_TIMER_TICK);
mv_set_timer(0, MV_TIMER_TICK);
val = mv_get_timer_control();
val |= CPU_TIMER0_EN | CPU_TIMER0_AUTO;
mv_set_timer_control(val);
}
static void
mv_setup_timercount(void)
{
uint32_t val;
mv_set_timer_rel(1, INITIAL_TIMECOUNTER);
mv_set_timer(1, INITIAL_TIMECOUNTER);
val = mv_get_timer_control();
val |= CPU_TIMER1_EN | CPU_TIMER1_AUTO;
mv_set_timer_control(val);
}