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614 lines
14 KiB
C
614 lines
14 KiB
C
/*-
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* Copyright (c) 2006 M. Warner Losh. All rights reserved.
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* Copyright (C) 2012 Ian Lepore. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/poll.h>
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#include <sys/rman.h>
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#include <sys/selinfo.h>
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#include <sys/sx.h>
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#include <sys/uio.h>
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#include <machine/at91_gpio.h>
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#include <machine/bus.h>
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#include <arm/at91/at91reg.h>
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#include <arm/at91/at91_pioreg.h>
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#include <arm/at91/at91_piovar.h>
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#define MAX_CHANGE 64
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struct at91_pio_softc
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{
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device_t dev; /* Myself */
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void *intrhand; /* Interrupt handle */
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struct resource *irq_res; /* IRQ resource */
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struct resource *mem_res; /* Memory resource */
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struct sx sc_mtx; /* basically a perimeter lock */
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struct cdev *cdev;
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struct selinfo selp;
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int buflen;
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uint8_t buf[MAX_CHANGE];
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int flags;
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#define OPENED 1
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};
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static inline uint32_t
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RD4(struct at91_pio_softc *sc, bus_size_t off)
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{
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return (bus_read_4(sc->mem_res, off));
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}
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static inline void
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WR4(struct at91_pio_softc *sc, bus_size_t off, uint32_t val)
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{
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bus_write_4(sc->mem_res, off, val);
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}
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#define AT91_PIO_LOCK(_sc) sx_xlock(&(_sc)->sc_mtx)
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#define AT91_PIO_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_mtx)
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#define AT91_PIO_LOCK_INIT(_sc) \
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sx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev))
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#define AT91_PIO_LOCK_DESTROY(_sc) sx_destroy(&_sc->sc_mtx);
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#define AT91_PIO_ASSERT_LOCKED(_sc) sx_assert(&_sc->sc_mtx, SA_XLOCKED);
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#define AT91_PIO_ASSERT_UNLOCKED(_sc) sx_assert(&_sc->sc_mtx, SA_UNLOCKED);
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#define CDEV2SOFTC(dev) ((dev)->si_drv1)
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static devclass_t at91_pio_devclass;
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/* bus entry points */
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static int at91_pio_probe(device_t dev);
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static int at91_pio_attach(device_t dev);
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static int at91_pio_detach(device_t dev);
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static void at91_pio_intr(void *);
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/* helper routines */
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static int at91_pio_activate(device_t dev);
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static void at91_pio_deactivate(device_t dev);
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/* cdev routines */
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static d_open_t at91_pio_open;
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static d_close_t at91_pio_close;
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static d_read_t at91_pio_read;
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static d_poll_t at91_pio_poll;
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static d_ioctl_t at91_pio_ioctl;
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static struct cdevsw at91_pio_cdevsw =
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{
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.d_version = D_VERSION,
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.d_open = at91_pio_open,
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.d_close = at91_pio_close,
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.d_read = at91_pio_read,
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.d_poll = at91_pio_poll,
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.d_ioctl = at91_pio_ioctl
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};
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static int
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at91_pio_probe(device_t dev)
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{
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const char *name;
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switch (device_get_unit(dev)) {
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case 0:
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name = "PIOA";
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break;
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case 1:
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name = "PIOB";
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break;
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case 2:
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name = "PIOC";
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break;
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case 3:
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name = "PIOD";
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break;
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default:
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name = "PIO";
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break;
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}
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device_set_desc(dev, name);
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return (0);
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}
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static int
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at91_pio_attach(device_t dev)
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{
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struct at91_pio_softc *sc;
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int err;
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sc = device_get_softc(dev);
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sc->dev = dev;
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err = at91_pio_activate(dev);
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if (err)
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goto out;
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if (bootverbose)
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device_printf(dev, "ABSR: %#x OSR: %#x PSR:%#x ODSR: %#x\n",
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RD4(sc, PIO_ABSR), RD4(sc, PIO_OSR), RD4(sc, PIO_PSR),
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RD4(sc, PIO_ODSR));
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AT91_PIO_LOCK_INIT(sc);
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/*
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* Activate the interrupt, but disable all interrupts in the hardware.
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*/
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WR4(sc, PIO_IDR, 0xffffffff);
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err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC,
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NULL, at91_pio_intr, sc, &sc->intrhand);
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if (err) {
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AT91_PIO_LOCK_DESTROY(sc);
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goto out;
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}
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sc->cdev = make_dev(&at91_pio_cdevsw, device_get_unit(dev), UID_ROOT,
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GID_WHEEL, 0600, "pio%d", device_get_unit(dev));
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if (sc->cdev == NULL) {
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err = ENOMEM;
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goto out;
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}
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sc->cdev->si_drv1 = sc;
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out:
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if (err)
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at91_pio_deactivate(dev);
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return (err);
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}
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static int
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at91_pio_detach(device_t dev)
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{
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return (EBUSY); /* XXX */
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}
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static int
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at91_pio_activate(device_t dev)
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{
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struct at91_pio_softc *sc;
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int rid;
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sc = device_get_softc(dev);
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rid = 0;
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sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
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RF_ACTIVE);
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if (sc->mem_res == NULL)
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goto errout;
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rid = 0;
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sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
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RF_ACTIVE | RF_SHAREABLE);
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if (sc->irq_res == NULL)
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goto errout;
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return (0);
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errout:
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at91_pio_deactivate(dev);
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return (ENOMEM);
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}
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static void
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at91_pio_deactivate(device_t dev)
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{
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struct at91_pio_softc *sc;
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sc = device_get_softc(dev);
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if (sc->intrhand)
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bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
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sc->intrhand = 0;
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bus_generic_detach(sc->dev);
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if (sc->mem_res)
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bus_release_resource(dev, SYS_RES_MEMORY,
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rman_get_rid(sc->mem_res), sc->mem_res);
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sc->mem_res = 0;
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if (sc->irq_res)
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bus_release_resource(dev, SYS_RES_IRQ,
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rman_get_rid(sc->irq_res), sc->irq_res);
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sc->irq_res = 0;
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}
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static void
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at91_pio_intr(void *xsc)
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{
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struct at91_pio_softc *sc = xsc;
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uint32_t status;
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int i;
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/* Reading the status also clears the interrupt. */
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status = RD4(sc, PIO_ISR) & RD4(sc, PIO_IMR);
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if (status != 0) {
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AT91_PIO_LOCK(sc);
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for (i = 0; status != 0 && sc->buflen < MAX_CHANGE; ++i) {
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if (status & 1)
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sc->buf[sc->buflen++] = (uint8_t)i;
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status >>= 1;
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}
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AT91_PIO_UNLOCK(sc);
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wakeup(sc);
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selwakeup(&sc->selp);
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}
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}
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static int
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at91_pio_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
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{
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struct at91_pio_softc *sc;
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sc = CDEV2SOFTC(dev);
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AT91_PIO_LOCK(sc);
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if (!(sc->flags & OPENED)) {
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sc->flags |= OPENED;
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}
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AT91_PIO_UNLOCK(sc);
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return (0);
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}
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static int
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at91_pio_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
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{
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struct at91_pio_softc *sc;
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sc = CDEV2SOFTC(dev);
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AT91_PIO_LOCK(sc);
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sc->flags &= ~OPENED;
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AT91_PIO_UNLOCK(sc);
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return (0);
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}
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static int
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at91_pio_poll(struct cdev *dev, int events, struct thread *td)
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{
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struct at91_pio_softc *sc;
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int revents = 0;
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sc = CDEV2SOFTC(dev);
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AT91_PIO_LOCK(sc);
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if (events & (POLLIN | POLLRDNORM)) {
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if (sc->buflen != 0)
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revents |= events & (POLLIN | POLLRDNORM);
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else
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selrecord(td, &sc->selp);
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}
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AT91_PIO_UNLOCK(sc);
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return (revents);
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}
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static int
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at91_pio_read(struct cdev *dev, struct uio *uio, int flag)
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{
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struct at91_pio_softc *sc;
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int err, ret, len;
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sc = CDEV2SOFTC(dev);
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AT91_PIO_LOCK(sc);
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err = 0;
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ret = 0;
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while (uio->uio_resid) {
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while (sc->buflen == 0 && err == 0)
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err = msleep(sc, &sc->sc_mtx, PCATCH | PZERO, "prd", 0);
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if (err != 0)
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break;
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len = MIN(sc->buflen, uio->uio_resid);
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err = uiomove(sc->buf, len, uio);
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if (err != 0)
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break;
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/*
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* If we read the whole thing no datacopy is needed,
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* otherwise we move the data down.
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*/
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ret += len;
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if (sc->buflen == len)
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sc->buflen = 0;
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else {
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bcopy(sc->buf + len, sc->buf, sc->buflen - len);
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sc->buflen -= len;
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}
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/* If there's no data left, end the read. */
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if (sc->buflen == 0)
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break;
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}
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AT91_PIO_UNLOCK(sc);
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return (err);
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}
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static void
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at91_pio_bang32(struct at91_pio_softc *sc, uint32_t bits, uint32_t datapin,
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uint32_t clockpin)
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{
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int i;
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for (i = 0; i < 32; i++) {
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if (bits & 0x80000000)
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WR4(sc, PIO_SODR, datapin);
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else
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WR4(sc, PIO_CODR, datapin);
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bits <<= 1;
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WR4(sc, PIO_CODR, clockpin);
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WR4(sc, PIO_SODR, clockpin);
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}
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}
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static void
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at91_pio_bang(struct at91_pio_softc *sc, uint8_t bits, uint32_t bitcount,
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uint32_t datapin, uint32_t clockpin)
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{
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int i;
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for (i = 0; i < bitcount; i++) {
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if (bits & 0x80)
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WR4(sc, PIO_SODR, datapin);
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else
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WR4(sc, PIO_CODR, datapin);
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bits <<= 1;
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WR4(sc, PIO_CODR, clockpin);
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WR4(sc, PIO_SODR, clockpin);
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}
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}
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static int
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at91_pio_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
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struct thread *td)
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{
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struct at91_pio_softc *sc;
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struct at91_gpio_cfg *cfg;
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struct at91_gpio_info *info;
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struct at91_gpio_bang *bang;
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struct at91_gpio_bang_many *bangmany;
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uint32_t i, num;
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uint8_t many[1024], *walker;
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int err;
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int bitcount;
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sc = CDEV2SOFTC(dev);
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switch(cmd) {
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case AT91_GPIO_SET: /* turn bits on */
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WR4(sc, PIO_SODR, *(uint32_t *)data);
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return (0);
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case AT91_GPIO_CLR: /* turn bits off */
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WR4(sc, PIO_CODR, *(uint32_t *)data);
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return (0);
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case AT91_GPIO_READ: /* Get the status of input bits */
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*(uint32_t *)data = RD4(sc, PIO_PDSR);
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return (0);
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case AT91_GPIO_CFG: /* Configure AT91_GPIO pins */
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cfg = (struct at91_gpio_cfg *)data;
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if (cfg->cfgmask & AT91_GPIO_CFG_INPUT) {
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WR4(sc, PIO_OER, cfg->iomask & ~cfg->input);
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WR4(sc, PIO_ODR, cfg->iomask & cfg->input);
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}
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if (cfg->cfgmask & AT91_GPIO_CFG_HI_Z) {
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WR4(sc, PIO_MDDR, cfg->iomask & ~cfg->hi_z);
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WR4(sc, PIO_MDER, cfg->iomask & cfg->hi_z);
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}
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if (cfg->cfgmask & AT91_GPIO_CFG_PULLUP) {
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WR4(sc, PIO_PUDR, cfg->iomask & ~cfg->pullup);
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WR4(sc, PIO_PUER, cfg->iomask & cfg->pullup);
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}
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if (cfg->cfgmask & AT91_GPIO_CFG_GLITCH) {
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WR4(sc, PIO_IFDR, cfg->iomask & ~cfg->glitch);
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WR4(sc, PIO_IFER, cfg->iomask & cfg->glitch);
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}
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if (cfg->cfgmask & AT91_GPIO_CFG_GPIO) {
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WR4(sc, PIO_PDR, cfg->iomask & ~cfg->gpio);
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WR4(sc, PIO_PER, cfg->iomask & cfg->gpio);
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}
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if (cfg->cfgmask & AT91_GPIO_CFG_PERIPH) {
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WR4(sc, PIO_ASR, cfg->iomask & ~cfg->periph);
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WR4(sc, PIO_BSR, cfg->iomask & cfg->periph);
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}
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if (cfg->cfgmask & AT91_GPIO_CFG_INTR) {
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WR4(sc, PIO_IDR, cfg->iomask & ~cfg->intr);
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WR4(sc, PIO_IER, cfg->iomask & cfg->intr);
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}
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return (0);
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case AT91_GPIO_BANG:
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bang = (struct at91_gpio_bang *)data;
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at91_pio_bang32(sc, bang->bits, bang->datapin, bang->clockpin);
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return (0);
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case AT91_GPIO_BANG_MANY:
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bangmany = (struct at91_gpio_bang_many *)data;
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walker = (uint8_t *)bangmany->bits;
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bitcount = bangmany->numbits;
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while (bitcount > 0) {
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num = MIN((bitcount + 7) / 8, sizeof(many));
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err = copyin(walker, many, num);
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if (err)
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return err;
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for (i = 0; i < num && bitcount > 0; i++, bitcount -= 8)
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if (bitcount >= 8)
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at91_pio_bang(sc, many[i], 8, bangmany->datapin, bangmany->clockpin);
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else
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at91_pio_bang(sc, many[i], bitcount, bangmany->datapin, bangmany->clockpin);
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walker += num;
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}
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return (0);
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case AT91_GPIO_INFO: /* Learn about this device's AT91_GPIO bits */
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info = (struct at91_gpio_info *)data;
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info->output_status = RD4(sc, PIO_ODSR);
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info->input_status = RD4(sc, PIO_OSR);
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info->highz_status = RD4(sc, PIO_MDSR);
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info->pullup_status = RD4(sc, PIO_PUSR);
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info->glitch_status = RD4(sc, PIO_IFSR);
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info->enabled_status = RD4(sc, PIO_PSR);
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info->periph_status = RD4(sc, PIO_ABSR);
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info->intr_status = RD4(sc, PIO_IMR);
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memset(info->extra_status, 0, sizeof(info->extra_status));
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return (0);
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}
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return (ENOTTY);
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}
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/*
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* The following functions are called early in the boot process, so
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* don't use bus_space, as that isn't yet available when we need to use
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* them.
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*/
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void
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at91_pio_use_periph_a(uint32_t pio, uint32_t periph_a_mask, int use_pullup)
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{
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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_high_z(uint32_t pio, uint32_t high_z_mask, int enable)
|
|
{
|
|
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
|
|
|
|
if (enable)
|
|
PIO[PIO_MDER / 4] = high_z_mask;
|
|
else
|
|
PIO[PIO_MDDR / 4] = high_z_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;
|
|
}
|
|
|
|
uint32_t
|
|
at91_pio_gpio_get(uint32_t pio, uint32_t data_mask)
|
|
{
|
|
uint32_t *PIO = (uint32_t *)(AT91_BASE + pio);
|
|
|
|
return (PIO[PIO_PDSR / 4] & data_mask);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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),
|
|
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
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, NULL,
|
|
NULL);
|