diff options
Diffstat (limited to 'sys/arm/freescale/imx/imx6_src.c')
| -rw-r--r-- | sys/arm/freescale/imx/imx6_src.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/sys/arm/freescale/imx/imx6_src.c b/sys/arm/freescale/imx/imx6_src.c new file mode 100644 index 000000000000..0316338128fc --- /dev/null +++ b/sys/arm/freescale/imx/imx6_src.c @@ -0,0 +1,169 @@ +/*- + * Copyright (c) 2015 Oleksandr Tymoshenko <gonzo@freebsd.org> + * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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> +/* + * System Reset Control for iMX6 + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/bus.h> +#include <sys/rman.h> + +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include <machine/bus.h> + +#include <arm/freescale/imx/imx6_src.h> + +#define SRC_SCR 0 +#define SW_IPU1_RST (1 << 3) + +struct src_softc { + device_t dev; + struct resource *mem_res; +}; + +static struct src_softc *src_sc; + +static inline uint32_t +RD4(struct src_softc *sc, bus_size_t off) +{ + + return (bus_read_4(sc->mem_res, off)); +} + +static inline void +WR4(struct src_softc *sc, bus_size_t off, uint32_t val) +{ + + bus_write_4(sc->mem_res, off, val); +} + +int +src_reset_ipu(void) +{ + uint32_t reg; + int timeout = 10000; + + if (src_sc == NULL) + return (-1); + + reg = RD4(src_sc, SRC_SCR); + reg |= SW_IPU1_RST; + WR4(src_sc, SRC_SCR, reg); + + while (timeout-- > 0) { + reg = RD4(src_sc, SRC_SCR); + if (reg & SW_IPU1_RST) + DELAY(1); + else + break; + } + + if (timeout < 0) + return (-1); + else + return (0); +} + +static int +src_detach(device_t dev) +{ + struct src_softc *sc; + + sc = device_get_softc(dev); + + if (sc->mem_res != NULL) + bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res); + + return (0); +} + +static int +src_attach(device_t dev) +{ + struct src_softc *sc; + int err, rid; + + sc = device_get_softc(dev); + err = 0; + + /* Allocate bus_space resources. */ + rid = 0; + sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, + RF_ACTIVE); + if (sc->mem_res == NULL) { + device_printf(dev, "Cannot allocate memory resources\n"); + err = ENXIO; + goto out; + } + + src_sc = sc; + + err = 0; + +out: + + if (err != 0) + src_detach(dev); + + return (err); +} + +static int +src_probe(device_t dev) +{ + + if ((ofw_bus_is_compatible(dev, "fsl,imx6q-src") == 0) && + (ofw_bus_is_compatible(dev, "fsl,imx6-src") == 0)) + return (ENXIO); + + device_set_desc(dev, "Freescale i.MX6 System Reset Controller"); + + return (BUS_PROBE_DEFAULT); +} + +static device_method_t src_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, src_probe), + DEVMETHOD(device_attach, src_attach), + DEVMETHOD(device_detach, src_detach), + + DEVMETHOD_END +}; + +static driver_t src_driver = { + "src", + src_methods, + sizeof(struct src_softc) +}; + +DRIVER_MODULE(src, simplebus, src_driver, 0, 0); |