286 lines
6.8 KiB
C
286 lines
6.8 KiB
C
/*-
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* Copyright (c) 2006 M. Warner Losh. 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 THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 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/module.h>
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#include <sys/mutex.h>
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#include <sys/rman.h>
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#include <machine/bus.h>
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#include <arm/at91/at91_sscreg.h>
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struct at91_ssc_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 mtx sc_mtx; /* basically a perimeter lock */
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struct cdev *cdev;
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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_ssc_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_ssc_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_SSC_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
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#define AT91_SSC_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
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#define AT91_SSC_LOCK_INIT(_sc) \
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mtx_init(&(_sc)->sc_mtx, device_get_nameunit((_sc)->dev), \
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"ssc", MTX_DEF)
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#define AT91_SSC_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx);
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#define AT91_SSC_ASSERT_LOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_OWNED);
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#define AT91_SSC_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_NOTOWNED);
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#define CDEV2SOFTC(dev) ((dev)->si_drv1)
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static devclass_t at91_ssc_devclass;
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/* bus entry points */
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static int at91_ssc_probe(device_t dev);
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static int at91_ssc_attach(device_t dev);
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static int at91_ssc_detach(device_t dev);
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static void at91_ssc_intr(void *);
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/* helper routines */
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static int at91_ssc_activate(device_t dev);
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static void at91_ssc_deactivate(device_t dev);
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/* cdev routines */
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static d_open_t at91_ssc_open;
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static d_close_t at91_ssc_close;
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static d_read_t at91_ssc_read;
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static d_write_t at91_ssc_write;
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static struct cdevsw at91_ssc_cdevsw =
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{
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.d_version = D_VERSION,
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.d_open = at91_ssc_open,
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.d_close = at91_ssc_close,
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.d_read = at91_ssc_read,
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.d_write = at91_ssc_write,
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};
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static int
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at91_ssc_probe(device_t dev)
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{
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device_set_desc(dev, "SSC");
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return (0);
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}
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static int
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at91_ssc_attach(device_t dev)
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{
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struct at91_ssc_softc *sc = device_get_softc(dev);
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int err;
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sc->dev = dev;
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err = at91_ssc_activate(dev);
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if (err)
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goto out;
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AT91_SSC_LOCK_INIT(sc);
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/*
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* Activate the interrupt
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*/
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err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
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at91_ssc_intr, sc, &sc->intrhand);
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if (err) {
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AT91_SSC_LOCK_DESTROY(sc);
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goto out;
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}
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sc->cdev = make_dev(&at91_ssc_cdevsw, device_get_unit(dev), UID_ROOT,
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GID_WHEEL, 0600, "ssc%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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// Init for TSC needs
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WR4(sc, SSC_CR, SSC_CR_SWRST);
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WR4(sc, SSC_CMR, 0); // clock divider unused
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WR4(sc, SSC_RCMR,
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SSC_RCMR_CKS_RK | SSC_RCMR_CKO_NONE | SSC_RCMR_START_FALL_EDGE_RF);
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WR4(sc, SSC_RFMR,
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0x1f | SSC_RFMR_MSFBF | SSC_RFMR_FSOS_NONE);
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WR4(sc, SSC_TCMR,
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SSC_TCMR_CKS_TK | SSC_TCMR_CKO_NONE | SSC_RCMR_START_CONT);
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WR4(sc, SSC_TFMR,
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0x1f | SSC_TFMR_DATDEF | SSC_TFMR_MSFBF | SSC_TFMR_FSOS_NEG_PULSE);
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out:;
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if (err)
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at91_ssc_deactivate(dev);
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return (err);
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}
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static int
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at91_ssc_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_ssc_activate(device_t dev)
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{
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struct at91_ssc_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);
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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_ssc_deactivate(dev);
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return (ENOMEM);
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}
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static void
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at91_ssc_deactivate(device_t dev)
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{
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struct at91_ssc_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_IOPORT,
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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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return;
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}
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static void
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at91_ssc_intr(void *xsc)
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{
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struct at91_ssc_softc *sc = xsc;
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#if 0
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uint32_t status;
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/* Reading the status also clears the interrupt */
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status = RD4(sc, SSC_SR);
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if (status == 0)
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return;
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AT91_SSC_LOCK(sc);
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AT91_SSC_UNLOCK(sc);
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#endif
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wakeup(sc);
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return;
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}
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static int
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at91_ssc_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
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{
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struct at91_ssc_softc *sc;
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sc = CDEV2SOFTC(dev);
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AT91_SSC_LOCK(sc);
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if (!(sc->flags & OPENED)) {
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sc->flags |= OPENED;
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#if 0
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// Enable interrupts
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#endif
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}
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AT91_SSC_UNLOCK(sc);
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return (0);
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}
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static int
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at91_ssc_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
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{
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struct at91_ssc_softc *sc;
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sc = CDEV2SOFTC(dev);
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AT91_SSC_LOCK(sc);
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sc->flags &= ~OPENED;
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#if 0
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// Disable interrupts
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#endif
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AT91_SSC_UNLOCK(sc);
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return (0);
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}
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static int
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at91_ssc_read(struct cdev *dev, struct uio *uio, int flag)
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{
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return EIO;
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}
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static int
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at91_ssc_write(struct cdev *dev, struct uio *uio, int flag)
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{
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return EIO;
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}
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static device_method_t at91_ssc_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, at91_ssc_probe),
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DEVMETHOD(device_attach, at91_ssc_attach),
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DEVMETHOD(device_detach, at91_ssc_detach),
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{ 0, 0 }
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};
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static driver_t at91_ssc_driver = {
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"at91_ssc",
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at91_ssc_methods,
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sizeof(struct at91_ssc_softc),
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};
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DRIVER_MODULE(at91_ssc, atmelarm, at91_ssc_driver, at91_ssc_devclass, 0, 0);
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