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/*-
* Copyright (c) 2010 Yohanes Nugroho. All rights reserved.
*
* 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/time.h>
#include <sys/bus.h>
#include <sys/resource.h>
#include <sys/timetc.h>
#include <sys/watchdog.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/resource.h>
#include <machine/frame.h>
#include <machine/intr.h>
#include <arm/at91/at91var.h>
#include <arm/at91/at91_pitreg.h>
#include <arm/at91/at91_pmcvar.h>
#include <arm/at91/at91sam9g20reg.h>
__FBSDID("$FreeBSD$");
static struct at91pit_softc {
bus_space_tag_t sc_st;
bus_space_handle_t sc_sh;
device_t sc_dev;
} *pit_softc;
#define RD4(off) \
bus_space_read_4(pit_softc->sc_st, pit_softc->sc_sh, (off))
#define WR4(off, val) \
bus_space_write_4(pit_softc->sc_st, pit_softc->sc_sh, (off), (val))
static unsigned at91pit_get_timecount(struct timecounter *tc);
static int clock_intr(void *arg);
static struct timecounter at91pit_timecounter = {
at91pit_get_timecount, /* get_timecount */
NULL, /* no poll_pps */
0xffffffffu, /* counter mask */
0, /* frequency */
"AT91SAM9261 timer", /* name */
1000 /* quality */
};
uint32_t
at91_pit_base(void);
uint32_t
at91_pit_size(void);
static int
at91pit_probe(device_t dev)
{
device_set_desc(dev, "PIT");
return (0);
}
uint32_t
at91_pit_base(void)
{
return (AT91SAM9G20_PIT_BASE);
}
uint32_t
at91_pit_size(void)
{
return (AT91SAM9G20_PIT_SIZE);
}
static int pit_rate;
static int pit_cycle;
static int pit_counter;
static int
at91pit_attach(device_t dev)
{
struct at91_softc *sc = device_get_softc(device_get_parent(dev));
struct resource *irq;
int rid = 0;
void *ih;
pit_softc = device_get_softc(dev);
pit_softc->sc_st = sc->sc_st;
pit_softc->sc_dev = dev;
if (bus_space_subregion(sc->sc_st, sc->sc_sh, at91_pit_base(),
at91_pit_size(), &pit_softc->sc_sh) != 0)
panic("couldn't subregion pit registers");
irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 1, 1, 1,
RF_ACTIVE | RF_SHAREABLE);
if (!irq)
panic("Unable to allocate IRQ for the system timer");
else
bus_setup_intr(dev, irq, INTR_TYPE_CLK,
clock_intr, NULL, NULL, &ih);
device_printf(dev, "AT91SAM9x pit registered\n");
return (0);
}
static device_method_t at91pit_methods[] = {
DEVMETHOD(device_probe, at91pit_probe),
DEVMETHOD(device_attach, at91pit_attach),
{0,0},
};
static driver_t at91pit_driver = {
"at91_pit",
at91pit_methods,
sizeof(struct at91pit_softc),
};
static devclass_t at91pit_devclass;
DRIVER_MODULE(at91_pit, atmelarm, at91pit_driver, at91pit_devclass, 0, 0);
static int
clock_intr(void *arg)
{
struct trapframe *fp = arg;
if (RD4(PIT_SR) & PIT_PITS_DONE) {
uint32_t pivr = RD4(PIT_PIVR);
if (PIT_CNT(pivr)>1) {
printf("cnt = %d\n", PIT_CNT(pivr));
}
pit_counter += pit_cycle;
hardclock(TRAPF_USERMODE(fp), TRAPF_PC(fp));
return (FILTER_HANDLED);
}
return (FILTER_STRAY);
}
static unsigned
at91pit_get_timecount(struct timecounter *tc)
{
return pit_counter;
}
/*todo: review this*/
void
DELAY(int n)
{
u_int32_t start, end, cur;
start = RD4(PIT_PIIR);
n = (n * 1000) / (at91_master_clock / 12);
if (n <= 0)
n = 1;
end = (start + n);
cur = start;
if (start > end) {
while (cur >= start || cur < end)
cur = RD4(PIT_PIIR);
} else {
while (cur < end)
cur = RD4(PIT_PIIR);
}
}
/*
* The 3 next functions must be implement with the futur PLL code.
*/
void
cpu_startprofclock(void)
{
}
void
cpu_stopprofclock(void)
{
}
#define HZ 100
void
cpu_initclocks(void)
{
struct at91_pmc_clock *master;
master = at91_pmc_clock_ref("mck");
pit_rate = master->hz / 16;
pit_cycle = (pit_rate + HZ/2) / HZ;
at91pit_timecounter.tc_frequency = pit_rate;
WR4(PIT_MR, 0);
while (PIT_PIV(RD4(PIT_PIVR)) != 0);
WR4(PIT_MR, (pit_cycle - 1) | PIT_IEN | PIT_EN);
tc_init(&at91pit_timecounter);
}
void
cpu_reset(void)
{
*(volatile int *)(AT91SAM9G20_BASE + AT91SAM9G20_RSTC_BASE +
RSTC_CR) = RSTC_PROCRST | RSTC_PERRST | RSTC_KEY;
while (1)
continue;
}
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