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| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/cxgbe/if_cxgbe/@/arm/s3c2xx0/s3c24x0_clk.c |
/* $NetBSD: s3c24x0_clk.c,v 1.6 2005/12/24 20:06:52 perry Exp $ */
/*
* Copyright (c) 2003 Genetec corporation. All rights reserved.
* Written by Hiroyuki Bessho for Genetec corporation.
*
* 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.
* 3. The name of Genetec corporation may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY GENETEC CORP. ``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 GENETEC CORP.
* 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>
__FBSDID("$FreeBSD: release/9.1.0/sys/arm/s3c2xx0/s3c24x0_clk.c 217072 2011-01-06 21:08:06Z jhb $");
#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/rman.h>
#include <sys/timetc.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/frame.h>
#include <machine/resource.h>
#include <machine/intr.h>
#include <arm/s3c2xx0/s3c24x0reg.h>
#include <arm/s3c2xx0/s3c24x0var.h>
struct s3c24x0_timer_softc {
device_t dev;
} timer_softc;
static unsigned s3c24x0_timer_get_timecount(struct timecounter *tc);
static struct timecounter s3c24x0_timer_timecounter = {
s3c24x0_timer_get_timecount, /* get_timecount */
NULL, /* no poll_pps */
~0u, /* counter_mask */
3686400, /* frequency */
"s3c24x0 timer", /* name */
1000 /* quality */
};
static int
s3c24x0_timer_probe(device_t dev)
{
device_set_desc(dev, "s3c24x0 timer");
return (0);
}
static int
s3c24x0_timer_attach(device_t dev)
{
timer_softc.dev = dev;
/* We need to do this here for devices that expect DELAY to work */
return (0);
}
static device_method_t s3c24x0_timer_methods[] = {
DEVMETHOD(device_probe, s3c24x0_timer_probe),
DEVMETHOD(device_attach, s3c24x0_timer_attach),
{0, 0},
};
static driver_t s3c24x0_timer_driver = {
"timer",
s3c24x0_timer_methods,
sizeof(struct s3c24x0_timer_softc),
};
static devclass_t s3c24x0_timer_devclass;
DRIVER_MODULE(s3c24x0timer, s3c24x0, s3c24x0_timer_driver,
s3c24x0_timer_devclass, 0, 0);
#define TIMER_FREQUENCY(pclk) ((pclk)/16) /* divider=1/16 */
static unsigned int timer4_reload_value;
static unsigned int timer4_prescaler;
static unsigned int timer4_mseccount;
static volatile uint32_t s3c24x0_base;
#define usec_to_counter(t) \
((timer4_mseccount*(t))/1000)
#define counter_to_usec(c,pclk) \
(((c)*timer4_prescaler*1000)/(TIMER_FREQUENCY(pclk)/1000))
static inline int
read_timer(struct s3c24x0_softc *sc)
{
int count;
do {
count = bus_space_read_2(sc->sc_sx.sc_iot, sc->sc_timer_ioh,
TIMER_TCNTO(4));
} while ( __predict_false(count > timer4_reload_value) );
return count;
}
static unsigned
s3c24x0_timer_get_timecount(struct timecounter *tc)
{
struct s3c24x0_softc *sc = (struct s3c24x0_softc *)s3c2xx0_softc;
int value;
value = bus_space_read_2(sc->sc_sx.sc_iot, sc->sc_timer_ioh,
TIMER_TCNTO(4));
return (s3c24x0_base - value);
}
static int
clock_intr(void *arg)
{
struct trapframe *fp = arg;
atomic_add_32(&s3c24x0_base, timer4_reload_value);
hardclock(TRAPF_USERMODE(fp), TRAPF_PC(fp));
return (FILTER_HANDLED);
}
void
cpu_initclocks(void)
{
struct s3c24x0_softc *sc = (struct s3c24x0_softc *)s3c2xx0_softc;
long tc;
struct resource *irq;
int rid = 0;
void *ihl;
int err, prescaler;
int pclk = s3c2xx0_softc->sc_pclk;
bus_space_tag_t iot = sc->sc_sx.sc_iot;
bus_space_handle_t ioh = sc->sc_timer_ioh;
uint32_t reg;
device_t dev = timer_softc.dev;
/* We have already been initialized */
if (timer4_reload_value != 0)
return;
#define time_constant(hz) (TIMER_FREQUENCY(pclk) /(hz)/ prescaler)
#define calc_time_constant(hz) \
do { \
prescaler = 1; \
do { \
++prescaler; \
tc = time_constant(hz); \
} while( tc > 65536 ); \
} while(0)
/* Use the channels 4 and 3 for hardclock and statclock, respectively */
/* stop all timers */
bus_space_write_4(iot, ioh, TIMER_TCON, 0);
/* calc suitable prescaler value */
calc_time_constant(hz);
timer4_prescaler = prescaler;
timer4_reload_value = TIMER_FREQUENCY(pclk) / hz / prescaler;
timer4_mseccount = TIMER_FREQUENCY(pclk)/timer4_prescaler/1000 ;
bus_space_write_4(iot, ioh, TIMER_TCNTB(4),
((prescaler - 1) << 16) | (timer4_reload_value - 1));
printf("clock: hz=%d PCLK=%d prescaler=%d tc=%ld\n",
hz, pclk, prescaler, tc);
irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, S3C24X0_INT_TIMER4,
S3C24X0_INT_TIMER4, 1, RF_ACTIVE);
if (!irq)
panic("Unable to allocate the clock irq handler.\n");
err = bus_setup_intr(dev, irq, INTR_TYPE_CLK,
clock_intr, NULL, NULL, &ihl);
if (err != 0)
panic("Unable to setup the clock irq handler.\n");
/* set prescaler1 */
reg = bus_space_read_4(iot, ioh, TIMER_TCFG0);
bus_space_write_4(iot, ioh, TIMER_TCFG0,
(reg & ~0xff00) | ((prescaler-1) << 8));
/* divider 1/16 for ch #4 */
reg = bus_space_read_4(iot, ioh, TIMER_TCFG1);
bus_space_write_4(iot, ioh, TIMER_TCFG1,
(reg & ~(TCFG1_MUX_MASK(4))) |
(TCFG1_MUX_DIV16 << TCFG1_MUX_SHIFT(4)) );
/* start timers */
reg = bus_space_read_4(iot, ioh, TIMER_TCON);
reg &= ~(TCON_MASK(4));
/* load the time constant */
bus_space_write_4(iot, ioh, TIMER_TCON, reg | TCON_MANUALUPDATE(4));
/* set auto reload and start */
bus_space_write_4(iot, ioh, TIMER_TCON, reg |
TCON_AUTORELOAD(4) | TCON_START(4) );
s3c24x0_timer_timecounter.tc_frequency = TIMER_FREQUENCY(pclk) /
timer4_prescaler;
tc_init(&s3c24x0_timer_timecounter);
}
/*
* DELAY:
*
* Delay for at least N microseconds.
*/
void
DELAY(int n)
{
struct s3c24x0_softc *sc = (struct s3c24x0_softc *) s3c2xx0_softc;
int v0, v1, delta;
u_int ucnt;
if (timer4_reload_value == 0) {
/* not initialized yet */
while ( n-- > 0 ){
int m;
for (m = 0; m < 100; ++m )
;
}
return;
}
/* read down counter */
v0 = read_timer(sc);
ucnt = usec_to_counter(n);
while( ucnt > 0 ) {
v1 = read_timer(sc);
delta = v0 - v1;
if ( delta < 0 )
delta += timer4_reload_value;
if((u_int)delta < ucnt){
ucnt -= (u_int)delta;
v0 = v1;
}
else {
ucnt = 0;
}
}
}
void
cpu_startprofclock(void)
{
}
void
cpu_stopprofclock(void)
{
}