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freebsd/sys/arm/at91/at91_ssc.c
2006-10-20 07:08:59 +00:00

286 lines
6.8 KiB
C

/*-
* Copyright (c) 2006 M. Warner Losh. 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 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <arm/at91/at91_sscreg.h>
struct at91_ssc_softc
{
device_t dev; /* Myself */
void *intrhand; /* Interrupt handle */
struct resource *irq_res; /* IRQ resource */
struct resource *mem_res; /* Memory resource */
struct mtx sc_mtx; /* basically a perimeter lock */
struct cdev *cdev;
int flags;
#define OPENED 1
};
static inline uint32_t
RD4(struct at91_ssc_softc *sc, bus_size_t off)
{
return bus_read_4(sc->mem_res, off);
}
static inline void
WR4(struct at91_ssc_softc *sc, bus_size_t off, uint32_t val)
{
bus_write_4(sc->mem_res, off, val);
}
#define AT91_SSC_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
#define AT91_SSC_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
#define AT91_SSC_LOCK_INIT(_sc) \
mtx_init(&(_sc)->sc_mtx, device_get_nameunit((_sc)->dev), \
"ssc", MTX_DEF)
#define AT91_SSC_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx);
#define AT91_SSC_ASSERT_LOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_OWNED);
#define AT91_SSC_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_NOTOWNED);
#define CDEV2SOFTC(dev) ((dev)->si_drv1)
static devclass_t at91_ssc_devclass;
/* bus entry points */
static int at91_ssc_probe(device_t dev);
static int at91_ssc_attach(device_t dev);
static int at91_ssc_detach(device_t dev);
static void at91_ssc_intr(void *);
/* helper routines */
static int at91_ssc_activate(device_t dev);
static void at91_ssc_deactivate(device_t dev);
/* cdev routines */
static d_open_t at91_ssc_open;
static d_close_t at91_ssc_close;
static d_read_t at91_ssc_read;
static d_write_t at91_ssc_write;
static struct cdevsw at91_ssc_cdevsw =
{
.d_version = D_VERSION,
.d_open = at91_ssc_open,
.d_close = at91_ssc_close,
.d_read = at91_ssc_read,
.d_write = at91_ssc_write,
};
static int
at91_ssc_probe(device_t dev)
{
device_set_desc(dev, "SSC");
return (0);
}
static int
at91_ssc_attach(device_t dev)
{
struct at91_ssc_softc *sc = device_get_softc(dev);
int err;
sc->dev = dev;
err = at91_ssc_activate(dev);
if (err)
goto out;
AT91_SSC_LOCK_INIT(sc);
/*
* Activate the interrupt
*/
err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
at91_ssc_intr, sc, &sc->intrhand);
if (err) {
AT91_SSC_LOCK_DESTROY(sc);
goto out;
}
sc->cdev = make_dev(&at91_ssc_cdevsw, device_get_unit(dev), UID_ROOT,
GID_WHEEL, 0600, "ssc%d", device_get_unit(dev));
if (sc->cdev == NULL) {
err = ENOMEM;
goto out;
}
sc->cdev->si_drv1 = sc;
// Init for TSC needs
WR4(sc, SSC_CR, SSC_CR_SWRST);
WR4(sc, SSC_CMR, 0); // clock divider unused
WR4(sc, SSC_RCMR,
SSC_RCMR_CKS_RK | SSC_RCMR_CKO_NONE | SSC_RCMR_START_FALL_EDGE_RF);
WR4(sc, SSC_RFMR,
0x1f | SSC_RFMR_MSFBF | SSC_RFMR_FSOS_NONE);
WR4(sc, SSC_TCMR,
SSC_TCMR_CKS_TK | SSC_TCMR_CKO_NONE | SSC_RCMR_START_CONT);
WR4(sc, SSC_TFMR,
0x1f | SSC_TFMR_DATDEF | SSC_TFMR_MSFBF | SSC_TFMR_FSOS_NEG_PULSE);
out:;
if (err)
at91_ssc_deactivate(dev);
return (err);
}
static int
at91_ssc_detach(device_t dev)
{
return (EBUSY); /* XXX */
}
static int
at91_ssc_activate(device_t dev)
{
struct at91_ssc_softc *sc;
int rid;
sc = device_get_softc(dev);
rid = 0;
sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (sc->mem_res == NULL)
goto errout;
rid = 0;
sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE);
if (sc->irq_res == NULL)
goto errout;
return (0);
errout:
at91_ssc_deactivate(dev);
return (ENOMEM);
}
static void
at91_ssc_deactivate(device_t dev)
{
struct at91_ssc_softc *sc;
sc = device_get_softc(dev);
if (sc->intrhand)
bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
sc->intrhand = 0;
bus_generic_detach(sc->dev);
if (sc->mem_res)
bus_release_resource(dev, SYS_RES_IOPORT,
rman_get_rid(sc->mem_res), sc->mem_res);
sc->mem_res = 0;
if (sc->irq_res)
bus_release_resource(dev, SYS_RES_IRQ,
rman_get_rid(sc->irq_res), sc->irq_res);
sc->irq_res = 0;
return;
}
static void
at91_ssc_intr(void *xsc)
{
struct at91_ssc_softc *sc = xsc;
#if 0
uint32_t status;
/* Reading the status also clears the interrupt */
status = RD4(sc, SSC_SR);
if (status == 0)
return;
AT91_SSC_LOCK(sc);
AT91_SSC_UNLOCK(sc);
#endif
wakeup(sc);
return;
}
static int
at91_ssc_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
struct at91_ssc_softc *sc;
sc = CDEV2SOFTC(dev);
AT91_SSC_LOCK(sc);
if (!(sc->flags & OPENED)) {
sc->flags |= OPENED;
#if 0
// Enable interrupts
#endif
}
AT91_SSC_UNLOCK(sc);
return (0);
}
static int
at91_ssc_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
{
struct at91_ssc_softc *sc;
sc = CDEV2SOFTC(dev);
AT91_SSC_LOCK(sc);
sc->flags &= ~OPENED;
#if 0
// Disable interrupts
#endif
AT91_SSC_UNLOCK(sc);
return (0);
}
static int
at91_ssc_read(struct cdev *dev, struct uio *uio, int flag)
{
return EIO;
}
static int
at91_ssc_write(struct cdev *dev, struct uio *uio, int flag)
{
return EIO;
}
static device_method_t at91_ssc_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, at91_ssc_probe),
DEVMETHOD(device_attach, at91_ssc_attach),
DEVMETHOD(device_detach, at91_ssc_detach),
{ 0, 0 }
};
static driver_t at91_ssc_driver = {
"at91_ssc",
at91_ssc_methods,
sizeof(struct at91_ssc_softc),
};
DRIVER_MODULE(at91_ssc, atmelarm, at91_ssc_driver, at91_ssc_devclass, 0, 0);