5fdde3724c
driver will need more serious help to work with an interrupt driven path. There's many subtleties in driving the DMA engine with interrupts in many configurations. Best to not "guess" what the right way would be and mislead people.
270 lines
6.5 KiB
C
270 lines
6.5 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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NULL, 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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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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}
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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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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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