freebsd-dev/sys/arm/at91/at91_pio.c
2011-09-30 04:55:23 +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/at91reg.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 *)(AT91_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 *)(AT91_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 *)(AT91_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 *)(AT91_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 *)(AT91_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 *)(AT91_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 *)(AT91_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 *)(AT91_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 *)(AT91_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 *)(AT91_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 *)(AT91_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);