FreeBSD/Linux Kernel Cross Reference
sys/dev/iicbus/twsi/a10_twsi.c

     /*-
      * Copyright (c) 2016-2019 Emmanuel Vadot <manu@freebsd.org>
      *
      * 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 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 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>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/resource.h>
    
    #include <machine/bus.h>
    #include <machine/resource.h>
    
    #include <sys/rman.h>
    
    #include <sys/lock.h>
    #include <sys/mutex.h>
    
    #include <dev/iicbus/iiconf.h>
    #include <dev/iicbus/iicbus.h>
    #include <dev/iicbus/twsi/twsi.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include <dev/extres/clk/clk.h>
    #include <dev/extres/hwreset/hwreset.h>
    
    #include "iicbus_if.h"
    
    #define TWI_ADDR        0x0
    #define TWI_XADDR       0x4
    #define TWI_DATA        0x8
    #define TWI_CNTR        0xC
    #define TWI_STAT        0x10
    #define TWI_CCR         0x14
    #define TWI_SRST        0x18
    #define TWI_EFR         0x1C
    #define TWI_LCR         0x20
    
    static struct ofw_compat_data compat_data[] = {
            {"allwinner,sun4i-a10-i2c", 1},
            {"allwinner,sun6i-a31-i2c", 1},
            {"allwinner,sun8i-a83t-i2c", 1},
            {NULL, 0},
    };
    
    static int
    a10_twsi_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 Integrated I2C Bus Controller");
            return (BUS_PROBE_DEFAULT);
    }
    
    static int
    a10_twsi_attach(device_t dev)
    {
            struct twsi_softc *sc;
            hwreset_t rst;
            int error;
    
            sc = device_get_softc(dev);
    
            /* De-assert reset */
            if (hwreset_get_by_ofw_idx(dev, 0, 0, &rst) == 0) {
                    error = hwreset_deassert(rst);
                    if (error != 0) {
                            device_printf(dev, "could not de-assert reset\n");
                           return (error);
                   }
           }
   
           /* Activate clock */
           error = clk_get_by_ofw_index(dev, 0, 0, &sc->clk_core);
           if (error != 0) {
                   device_printf(dev, "could not find clock\n");
                   return (error);
           }
           error = clk_enable(sc->clk_core);
           if (error != 0) {
                   device_printf(dev, "could not enable clock\n");
                   return (error);
           }
   
           sc->reg_data = TWI_DATA;
           sc->reg_slave_addr = TWI_ADDR;
           sc->reg_slave_ext_addr = TWI_XADDR;
           sc->reg_control = TWI_CNTR;
           sc->reg_status = TWI_STAT;
           sc->reg_baud_rate = TWI_CCR;
           sc->reg_soft_reset = TWI_SRST;
   
           if (ofw_bus_is_compatible(dev, "allwinner,sun6i-a31-i2c") ||
               ofw_bus_is_compatible(dev, "allwinner,sun6i-a83t-i2c"))
                   sc->iflag_w1c = true;
           return (twsi_attach(dev));
   }
   
   static phandle_t
   a10_twsi_get_node(device_t bus, device_t dev)
   {
           return (ofw_bus_get_node(bus));
   }
   
   static device_method_t a10_twsi_methods[] = {
           /* device interface */
           DEVMETHOD(device_probe,         a10_twsi_probe),
           DEVMETHOD(device_attach,        a10_twsi_attach),
   
           /* OFW methods */
           DEVMETHOD(ofw_bus_get_node,     a10_twsi_get_node),
   
           { 0, 0 }
   };
   
   DEFINE_CLASS_1(iichb, a10_twsi_driver, a10_twsi_methods,
       sizeof(struct twsi_softc), twsi_driver);
   
   EARLY_DRIVER_MODULE(a10_twsi, simplebus, a10_twsi_driver,
       0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
   EARLY_DRIVER_MODULE(iicbus, a10_twsi, iicbus_driver,
       0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
   MODULE_DEPEND(a10_twsi, iicbus, 1, 1, 1);
   SIMPLEBUS_PNP_INFO(compat_data);

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