FreeBSD/Linux Kernel Cross Reference
sys/arm/ti/am335x/am3359_cppi41.c

     /*-
      * Copyright (c) 2019 Emmanuel Vadot <manu@FreeBSD.org>
      *
      * Copyright (c) 2020 Oskar Holmlund <oskar.holmlund@ohdata.se>
      *
      * 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.
     *
     * $FreeBSD$
     */
    /* Based on sys/arm/ti/ti_sysc.c */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/bus.h>
    #include <sys/resource.h>
    #include <sys/rman.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    
    #include <machine/bus.h>
    #include <machine/resource.h>
    
    #include <dev/fdt/simplebus.h>
    
    #include <dev/ofw/openfirm.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include <arm/ti/ti_sysc.h>
    
    #if 0
    #define DPRINTF(dev, msg...) device_printf(dev, msg)
    #else
    #define DPRINTF(dev, msg...)
    #endif
    
    struct ti_am3359_cppi41_softc {
            device_t                dev;
            struct syscon *         syscon;
            struct resource *       res[4];
            bus_space_tag_t         bst;
            bus_space_handle_t      bsh;
            struct mtx              mtx;
    };
    
    static struct resource_spec ti_am3359_cppi41_res_spec[] = {
            { SYS_RES_MEMORY, 0, RF_ACTIVE | RF_SHAREABLE },
            { SYS_RES_MEMORY, 1, RF_ACTIVE | RF_SHAREABLE },
            { SYS_RES_MEMORY, 2, RF_ACTIVE | RF_SHAREABLE },
            { SYS_RES_MEMORY, 3, RF_ACTIVE | RF_SHAREABLE },
            { -1, 0 }
    };
    
    /* Device */
    static struct ofw_compat_data compat_data[] = {
            { "ti,am3359-cppi41",   1 },
            { NULL,         0 }
    };
    
    static int
    ti_am3359_cppi41_write_4(device_t dev, bus_addr_t addr, uint32_t val)
    {
            struct ti_am3359_cppi41_softc *sc;
    
            sc = device_get_softc(dev);
            DPRINTF(sc->dev, "offset=%lx write %x\n", addr, val);
            mtx_lock(&sc->mtx);
            bus_space_write_4(sc->bst, sc->bsh, addr, val);
            mtx_unlock(&sc->mtx);
            return (0);
    }
    
    static uint32_t
    ti_am3359_cppi41_read_4(device_t dev, bus_addr_t addr)
    {
           struct ti_am3359_cppi41_softc *sc;
           uint32_t val;
   
           sc = device_get_softc(dev);
   
           mtx_lock(&sc->mtx);
           val = bus_space_read_4(sc->bst, sc->bsh, addr);
           mtx_unlock(&sc->mtx);
           DPRINTF(sc->dev, "offset=%lx Read %x\n", addr, val);
           return (val);
   }
   
   /* device interface */
   static int
   ti_am3359_cppi41_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, "TI AM3359 CPPI 41");
           return(BUS_PROBE_DEFAULT);
   }
   
   static int
   ti_am3359_cppi41_attach(device_t dev)
   {
           struct ti_am3359_cppi41_softc *sc;
           uint32_t reg, reset_bit, timeout=10;
           uint64_t sysc_address;
           device_t parent;
   
           sc = device_get_softc(dev);
           sc->dev = dev;
   
           if (bus_alloc_resources(dev, ti_am3359_cppi41_res_spec, sc->res)) {
                   device_printf(sc->dev, "Cant allocate resources\n");
                   return (ENXIO);
           }
   
           sc->dev = dev;
           sc->bst = rman_get_bustag(sc->res[0]);
           sc->bsh = rman_get_bushandle(sc->res[0]);
   
           mtx_init(&sc->mtx, device_get_nameunit(sc->dev), NULL, MTX_DEF);
   
           /* variant of am335x_usbss.c */
           DPRINTF(dev, "-- RESET USB --\n");
           parent = device_get_parent(dev);
           reset_bit = ti_sysc_get_soft_reset_bit(parent);
           if (reset_bit == 0) {
                   DPRINTF(dev, "Dont have reset bit\n");
                   return (0);
           }
           sysc_address = ti_sysc_get_sysc_address_offset_host(parent);
           DPRINTF(dev, "sysc_address %x\n", sysc_address);
           ti_am3359_cppi41_write_4(dev, sysc_address, reset_bit);
           DELAY(100);
           reg = ti_am3359_cppi41_read_4(dev, sysc_address);
           if ((reg & reset_bit) && timeout--) {
                   DPRINTF(dev, "Reset still ongoing - wait a little bit longer\n");
                   DELAY(100);
                   reg = ti_am3359_cppi41_read_4(dev, sysc_address);
           }
           if (timeout == 0)
                   device_printf(dev, "USB Reset timeout\n");
   
           return (0);
   }
   
   static device_method_t ti_am3359_cppi41_methods[] = {
           DEVMETHOD(device_probe,         ti_am3359_cppi41_probe),
           DEVMETHOD(device_attach,        ti_am3359_cppi41_attach),
   
           DEVMETHOD_END
   };
   
   DEFINE_CLASS_1(ti_am3359_cppi41, ti_am3359_cppi41_driver,
       ti_am3359_cppi41_methods,sizeof(struct ti_am3359_cppi41_softc),
       simplebus_driver);
   
   EARLY_DRIVER_MODULE(ti_am3359_cppi41, simplebus, ti_am3359_cppi41_driver, 0, 0,
       BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
   MODULE_VERSION(ti_am3359_cppi41, 1);
   MODULE_DEPEND(ti_am3359_cppi41, ti_sysc, 1, 1, 1);

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