FreeBSD/Linux Kernel Cross Reference
sys/mips/mediatek/mtk_clock.c

     /*-
      * Copyright (c) 2016 Stanislav Galabov
      * 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,
     *    without modification, immediately at the beginning of the file.
     * 2. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * 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>
    __FBSDID("$FreeBSD: releng/12.0/sys/mips/mediatek/mtk_clock.c 297667 2016-04-07 11:08:50Z sgalabov $");
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/bus.h>
    #include <sys/module.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 <dev/fdt/fdt_clock.h>
    
    #include <mips/mediatek/mtk_sysctl.h>
    
    #include "fdt_clock_if.h"
    
    static const struct ofw_compat_data compat_data[] = {
            { "ralink,rt2880-clock",        1 },
    
            /* Sentinel */
            { NULL,                         0 }
    };
    
    static int
    mtk_clock_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, "MTK Clock Controller");
    
            return (0);
    }
    
    static int
    mtk_clock_attach(device_t dev)
    {
    
            if (device_get_unit(dev) != 0) {
                    device_printf(dev, "Only one clock control allowed\n");
                    return (ENXIO);
            }
    
            fdt_clock_register_provider(dev);
    
            return (0);
    }
    
    #define CLOCK_ENABLE    1
    #define CLOCK_DISABLE   0
    
    static int
    mtk_clock_set(device_t dev, int index, int value)
    {
            uint32_t mask;
    
            /* Clock config register holds 32 clock gating bits */
            if (index < 0 || index > 31)
                    return (EINVAL);
    
            mask = (1u << index);
    
            if (value == CLOCK_ENABLE)
                    mtk_sysctl_clr_set(SYSCTL_CLKCFG1, 0, mask);
            else
                    mtk_sysctl_clr_set(SYSCTL_CLKCFG1, mask, 0);
   
           return (0);
   }
   
   static int
   mtk_clock_enable(device_t dev, int index)
   {
   
           return mtk_clock_set(dev, index, CLOCK_ENABLE);
   }
   
   static int
   mtk_clock_disable(device_t dev, int index)
   {
   
           return mtk_clock_set(dev, index, CLOCK_DISABLE);
   }
   
   static int
   mtk_clock_get_info(device_t dev, int index, struct fdt_clock_info *info)
   {
           uint32_t mask;
   
           if (index < 0 || index > 31 || info == NULL)
                   return (EINVAL);
   
           if (mtk_sysctl_get(SYSCTL_CLKCFG1) & mask)
                   info->flags = FDT_CIFLAG_RUNNING;
           else
                   info->flags = 0;
   
           return (0);
   }
   
   static device_method_t mtk_clock_methods[] = {
           DEVMETHOD(device_probe,         mtk_clock_probe),
           DEVMETHOD(device_attach,        mtk_clock_attach),
   
           /* fdt_clock interface */
           DEVMETHOD(fdt_clock_enable,     mtk_clock_enable),
           DEVMETHOD(fdt_clock_disable,    mtk_clock_disable),
           DEVMETHOD(fdt_clock_get_info,   mtk_clock_get_info),
   
           DEVMETHOD_END
   };
   
   static driver_t mtk_clock_driver = {
           "clkctrl",
           mtk_clock_methods,
           0,
   };
   static devclass_t mtk_clock_devclass;
   
   EARLY_DRIVER_MODULE(mtk_clock, simplebus, mtk_clock_driver, mtk_clock_devclass,
       0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_EARLY);
   
   MODULE_DEPEND(mtk_clock, mtk_sysctl, 1, 1, 1);

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