freebsd-src/sys/arm/at91/at91_pio.c
Warner Losh 82645a84eb Tweak the disclaimer section of the license to match COPYRIGHT, for
better or worse.  Ok'd by folks that have additional copyrights to the
files in cases where there's joint authorship.
2008-11-25 00:13:26 +00:00

412 lines
9.3 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 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>
__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/mbuf.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <arm/at91/at91rm92reg.h>
#include <arm/at91/at91_pioreg.h>
#include <arm/at91/at91_piovar.h>
struct at91_pio_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_pio_softc *sc, bus_size_t off)
{
return bus_read_4(sc->mem_res, off);
}
static inline void
WR4(struct at91_pio_softc *sc, bus_size_t off, uint32_t val)
{
bus_write_4(sc->mem_res, off, val);
}
#define AT91_PIO_LOCK(_sc) mtx_lock_spin(&(_sc)->sc_mtx)
#define AT91_PIO_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->sc_mtx)
#define AT91_PIO_LOCK_INIT(_sc) \
mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \
"pio", MTX_SPIN)
#define AT91_PIO_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
#define AT91_PIO_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED);
#define AT91_PIO_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
#define CDEV2SOFTC(dev) ((dev)->si_drv1)
static devclass_t at91_pio_devclass;
/* bus entry points */
static int at91_pio_probe(device_t dev);
static int at91_pio_attach(device_t dev);
static int at91_pio_detach(device_t dev);
static int at91_pio_intr(void *);
/* helper routines */
static int at91_pio_activate(device_t dev);
static void at91_pio_deactivate(device_t dev);
/* cdev routines */
static d_open_t at91_pio_open;
static d_close_t at91_pio_close;
static d_ioctl_t at91_pio_ioctl;
static struct cdevsw at91_pio_cdevsw =
{
.d_version = D_VERSION,
.d_open = at91_pio_open,
.d_close = at91_pio_close,
.d_ioctl = at91_pio_ioctl
};
static int
at91_pio_probe(device_t dev)
{
const char *name;
switch (device_get_unit(dev)) {
case 0:
name = "PIOA";
break;
case 1:
name = "PIOB";
break;
case 2:
name = "PIOC";
break;
case 3:
name = "PIOD";
break;
default:
name = "PIO";
break;
}
device_set_desc(dev, name);
return (0);
}
static int
at91_pio_attach(device_t dev)
{
struct at91_pio_softc *sc = device_get_softc(dev);
int err;
sc->dev = dev;
err = at91_pio_activate(dev);
if (err)
goto out;
device_printf(dev, "ABSR: %#x OSR: %#x PSR:%#x ODSR: %#x\n",
RD4(sc, PIO_ABSR), RD4(sc, PIO_OSR), RD4(sc, PIO_PSR),
RD4(sc, PIO_ODSR));
AT91_PIO_LOCK_INIT(sc);
/*
* Activate the interrupt, but disable all interrupts in the hardware
*/
WR4(sc, PIO_IDR, 0xffffffff);
err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC,
at91_pio_intr, NULL, sc, &sc->intrhand);
if (err) {
AT91_PIO_LOCK_DESTROY(sc);
goto out;
}
sc->cdev = make_dev(&at91_pio_cdevsw, device_get_unit(dev), UID_ROOT,
GID_WHEEL, 0600, "pio%d", device_get_unit(dev));
if (sc->cdev == NULL) {
err = ENOMEM;
goto out;
}
sc->cdev->si_drv1 = sc;
out:;
if (err)
at91_pio_deactivate(dev);
return (err);
}
static int
at91_pio_detach(device_t dev)
{
return (EBUSY); /* XXX */
}
static int
at91_pio_activate(device_t dev)
{
struct at91_pio_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 | RF_SHAREABLE);
if (sc->irq_res == NULL)
goto errout;
return (0);
errout:
at91_pio_deactivate(dev);
return (ENOMEM);
}
static void
at91_pio_deactivate(device_t dev)
{
struct at91_pio_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 int
at91_pio_intr(void *xsc)
{
struct at91_pio_softc *sc = xsc;
#if 0
uint32_t status;
/* Reading the status also clears the interrupt */
status = RD4(sc, PIO_SR);
if (status == 0)
return;
AT91_PIO_LOCK(sc);
AT91_PIO_UNLOCK(sc);
#endif
wakeup(sc);
return (FILTER_HANDLED);
}
static int
at91_pio_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
struct at91_pio_softc *sc;
sc = CDEV2SOFTC(dev);
AT91_PIO_LOCK(sc);
if (!(sc->flags & OPENED)) {
sc->flags |= OPENED;
#if 0
// Enable interrupts
#endif
}
AT91_PIO_UNLOCK(sc);
return (0);
}
static int
at91_pio_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
{
struct at91_pio_softc *sc;
sc = CDEV2SOFTC(dev);
AT91_PIO_LOCK(sc);
sc->flags &= ~OPENED;
#if 0
// Disable interrupts
#endif
AT91_PIO_UNLOCK(sc);
return (0);
}
static int
at91_pio_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
struct thread *td)
{
return (ENXIO);
}
/*
* The following functions are called early in the boot process, so
* don't use bus_space, as that isn't yet available when we need to use
* them.
*/
void
at91_pio_use_periph_a(uint32_t pio, uint32_t periph_a_mask, int use_pullup)
{
uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
PIO[PIO_ASR / 4] = periph_a_mask;
PIO[PIO_PDR / 4] = periph_a_mask;
if (use_pullup)
PIO[PIO_PUER / 4] = periph_a_mask;
else
PIO[PIO_PUDR / 4] = periph_a_mask;
}
void
at91_pio_use_periph_b(uint32_t pio, uint32_t periph_b_mask, int use_pullup)
{
uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
PIO[PIO_BSR / 4] = periph_b_mask;
PIO[PIO_PDR / 4] = periph_b_mask;
if (use_pullup)
PIO[PIO_PUER / 4] = periph_b_mask;
else
PIO[PIO_PUDR / 4] = periph_b_mask;
}
void
at91_pio_use_gpio(uint32_t pio, uint32_t gpio_mask)
{
uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
PIO[PIO_PER / 4] = gpio_mask;
}
void
at91_pio_gpio_input(uint32_t pio, uint32_t input_enable_mask)
{
uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
PIO[PIO_ODR / 4] = input_enable_mask;
}
void
at91_pio_gpio_output(uint32_t pio, uint32_t output_enable_mask, int use_pullup)
{
uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
PIO[PIO_OER / 4] = output_enable_mask;
if (use_pullup)
PIO[PIO_PUER / 4] = output_enable_mask;
else
PIO[PIO_PUDR / 4] = output_enable_mask;
}
void
at91_pio_gpio_set(uint32_t pio, uint32_t data_mask)
{
uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
PIO[PIO_SODR / 4] = data_mask;
}
void
at91_pio_gpio_clear(uint32_t pio, uint32_t data_mask)
{
uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
PIO[PIO_CODR / 4] = data_mask;
}
uint8_t
at91_pio_gpio_get(uint32_t pio, uint32_t data_mask)
{
uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
data_mask &= PIO[PIO_PDSR / 4];
return (data_mask ? 1 : 0);
}
void
at91_pio_gpio_set_deglitch(uint32_t pio, uint32_t data_mask, int use_deglitch)
{
uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
if (use_deglitch)
PIO[PIO_IFER / 4] = data_mask;
else
PIO[PIO_IFDR / 4] = data_mask;
return;
}
void
at91_pio_gpio_set_interrupt(uint32_t pio, uint32_t data_mask,
int enable_interrupt)
{
uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
if (enable_interrupt)
PIO[PIO_IER / 4] = data_mask;
else
PIO[PIO_IDR / 4] = data_mask;
return;
}
uint32_t
at91_pio_gpio_clear_interrupt(uint32_t pio)
{
uint32_t *PIO = (uint32_t *)(AT91RM92_BASE + pio);
/* reading this register will clear the interrupts */
return (PIO[PIO_ISR / 4]);
}
static device_method_t at91_pio_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, at91_pio_probe),
DEVMETHOD(device_attach, at91_pio_attach),
DEVMETHOD(device_detach, at91_pio_detach),
{ 0, 0 }
};
static driver_t at91_pio_driver = {
"at91_pio",
at91_pio_methods,
sizeof(struct at91_pio_softc),
};
DRIVER_MODULE(at91_pio, atmelarm, at91_pio_driver, at91_pio_devclass, 0, 0);