FreeBSD/Linux Kernel Cross Reference
sys/arm/allwinner/a10_sramc.c

     /*-
      * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@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.
     *
     * $FreeBSD: releng/10.2/sys/arm/allwinner/a10_sramc.c 266337 2014-05-17 18:53:36Z ian $
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/10.2/sys/arm/allwinner/a10_sramc.c 266337 2014-05-17 18:53:36Z ian $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/malloc.h>
    #include <sys/rman.h>
    #include <sys/timeet.h>
    #include <sys/timetc.h>
    #include <sys/watchdog.h>
    #include <machine/bus.h>
    #include <machine/cpu.h>
    #include <machine/frame.h>
    #include <machine/intr.h>
    #include <machine/fdt.h>
    
    #include <dev/fdt/fdt_common.h>
    #include <dev/ofw/openfirm.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include "a10_sramc.h"
    
    #define SRAM_CTL1_CFG           0x04
    
    struct a10_sramc_softc {
            struct resource         *res;
            bus_space_tag_t         bst;
            bus_space_handle_t      bsh;
    };
    
    static struct a10_sramc_softc *a10_sramc_sc;
    
    #define sramc_read_4(sc, reg)           \
        bus_space_read_4((sc)->bst, (sc)->bsh, (reg))
    #define sramc_write_4(sc, reg, val)     \
        bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val))
    
    
    static int
    a10_sramc_probe(device_t dev)
    {
    
            if (ofw_bus_is_compatible(dev, "allwinner,sun4i-sramc")) {
                    device_set_desc(dev, "Allwinner sramc module");
                    return (BUS_PROBE_DEFAULT);
            }
    
            return (ENXIO);
    }
    
    static int
    a10_sramc_attach(device_t dev)
    {
            struct a10_sramc_softc *sc = device_get_softc(dev);
            int rid = 0;
    
            sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
            if (!sc->res) {
                    device_printf(dev, "could not allocate resource\n");
                    return (ENXIO);
            }
    
            sc->bst = rman_get_bustag(sc->res);
            sc->bsh = rman_get_bushandle(sc->res);
    
            a10_sramc_sc = sc;
    
           return (0);
   }
   
   static device_method_t a10_sramc_methods[] = {
           DEVMETHOD(device_probe,         a10_sramc_probe),
           DEVMETHOD(device_attach,        a10_sramc_attach),
           { 0, 0 }
   };
   
   static driver_t a10_sramc_driver = {
           "a10_sramc",
           a10_sramc_methods,
           sizeof(struct a10_sramc_softc),
   };
   
   static devclass_t a10_sramc_devclass;
   
   DRIVER_MODULE(a10_sramc, simplebus, a10_sramc_driver, a10_sramc_devclass, 0, 0);
   
   int
   a10_map_to_emac(void)
   {
           struct a10_sramc_softc *sc = a10_sramc_sc;
           uint32_t reg_value;
   
           if (sc == NULL)
                   return (ENXIO);
   
           /* Map SRAM to EMAC, set bit 2 and 4. */
           reg_value = sramc_read_4(sc, SRAM_CTL1_CFG);
           reg_value |= 0x5 << 2;
           sramc_write_4(sc, SRAM_CTL1_CFG, reg_value);
   
           return (0);
   }

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