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freebsd/sys/arm/at91/at91_pio.c
Warner Losh 546bbbb56f MFp4:
Introduce framework to configure the multiplexed pins on boot.

	Since the USART supprots RS-485 multidrop mode, it allows the
	TX pins to float.  However, for RS-232 operations, we don't
	want these pins to float.  Instead, they should be pulled up
	to avoid mismatches.  Linux does something similar when it
	configures the TX lines.  This implies that we also allow the
	RX lines to float rather than be in the state they are left in
	by the boot loader.  Since they are input pins, I think that
	this is the right thing to do.

	Plus minor for our board.
2006-07-14 22:22:57 +00:00

368 lines
8.4 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/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 void 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 | INTR_FAST,
at91_pio_intr, 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 void
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;
}
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;
}
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);