diff options
Diffstat (limited to 'sys/arm/allwinner/aw_reset.c')
| -rw-r--r-- | sys/arm/allwinner/aw_reset.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/sys/arm/allwinner/aw_reset.c b/sys/arm/allwinner/aw_reset.c new file mode 100644 index 000000000000..39fbe53f2404 --- /dev/null +++ b/sys/arm/allwinner/aw_reset.c @@ -0,0 +1,165 @@ +/*- + * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca> + * + * 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. + * + * $FreeBSD$ + */ + +/* + * Allwinner module software reset registers + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bus.h> +#include <sys/rman.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/module.h> +#include <sys/mutex.h> +#include <machine/bus.h> + +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include <dev/extres/hwreset/hwreset.h> + +#include "hwreset_if.h" + +#define RESET_OFFSET(index) ((index / 32) * 4) +#define RESET_SHIFT(index) (index % 32) + +static struct ofw_compat_data compat_data[] = { + { "allwinner,sun6i-a31-ahb1-reset", 1 }, + { "allwinner,sun6i-a31-clock-reset", 1 }, + { NULL, 0 } +}; + +struct aw_reset_softc { + struct resource *res; + struct mtx mtx; +}; + +static struct resource_spec aw_reset_spec[] = { + { SYS_RES_MEMORY, 0, RF_ACTIVE }, + { -1, 0 } +}; + +#define RESET_READ(sc, reg) bus_read_4((sc)->res, (reg)) +#define RESET_WRITE(sc, reg, val) bus_write_4((sc)->res, (reg), (val)) + +static int +aw_reset_assert(device_t dev, intptr_t id, bool reset) +{ + struct aw_reset_softc *sc; + uint32_t reg_value; + + sc = device_get_softc(dev); + + mtx_lock(&sc->mtx); + reg_value = RESET_READ(sc, RESET_OFFSET(id)); + if (reset) + reg_value &= ~(1 << RESET_SHIFT(id)); + else + reg_value |= (1 << RESET_SHIFT(id)); + RESET_WRITE(sc, RESET_OFFSET(id), reg_value); + mtx_unlock(&sc->mtx); + + return (0); +} + +static int +aw_reset_is_asserted(device_t dev, intptr_t id, bool *reset) +{ + struct aw_reset_softc *sc; + uint32_t reg_value; + + sc = device_get_softc(dev); + + mtx_lock(&sc->mtx); + reg_value = RESET_READ(sc, RESET_OFFSET(id)); + mtx_unlock(&sc->mtx); + + *reset = (reg_value & (1 << RESET_SHIFT(id))) != 0 ? false : true; + + return (0); +} + +static int +aw_reset_probe(device_t dev) +{ + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) + return (ENXIO); + + device_set_desc(dev, "Allwinner Module Resets"); + return (BUS_PROBE_DEFAULT); +} + +static int +aw_reset_attach(device_t dev) +{ + struct aw_reset_softc *sc; + + sc = device_get_softc(dev); + + if (bus_alloc_resources(dev, aw_reset_spec, &sc->res) != 0) { + device_printf(dev, "cannot allocate resources for device\n"); + return (ENXIO); + } + + mtx_init(&sc->mtx, device_get_nameunit(dev), NULL, MTX_DEF); + + hwreset_register_ofw_provider(dev); + + return (0); +} + +static device_method_t aw_reset_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, aw_reset_probe), + DEVMETHOD(device_attach, aw_reset_attach), + + /* Reset interface */ + DEVMETHOD(hwreset_assert, aw_reset_assert), + DEVMETHOD(hwreset_is_asserted, aw_reset_is_asserted), + + DEVMETHOD_END +}; + +static driver_t aw_reset_driver = { + "aw_reset", + aw_reset_methods, + sizeof(struct aw_reset_softc), +}; + +static devclass_t aw_reset_devclass; + +EARLY_DRIVER_MODULE(aw_reset, simplebus, aw_reset_driver, aw_reset_devclass, + 0, 0, BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE); +MODULE_VERSION(aw_reset, 1); |