FreeBSD/Linux Kernel Cross Reference
sys/dev/extres/hwreset/hwreset.c

     /*-
      * Copyright 2016 Michal Meloun <mmel@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.
     *
     * $FreeBSD$
     */
    #include "opt_platform.h"
    #include <sys/cdefs.h>
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/kobj.h>
    #include <sys/malloc.h>
    #include <sys/systm.h>
    
    #ifdef FDT
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    #endif
    
    #include <dev/extres/hwreset/hwreset.h>
    
    #include "hwreset_if.h"
    
    struct hwreset {
            device_t consumer_dev;          /* consumer device*/
            device_t provider_dev;          /* provider device*/
            int     rst_id;                 /* reset id */
    };
    
    MALLOC_DEFINE(M_HWRESET, "hwreset", "Reset framework");
    
    int
    hwreset_assert(hwreset_t rst)
    {
    
            return (HWRESET_ASSERT(rst->provider_dev, rst->rst_id, true));
    }
    
    int
    hwreset_deassert(hwreset_t rst)
    {
    
            return (HWRESET_ASSERT(rst->provider_dev, rst->rst_id, false));
    }
    
    int
    hwreset_is_asserted(hwreset_t rst, bool *value)
    {
    
            return (HWRESET_IS_ASSERTED(rst->provider_dev, rst->rst_id, value));
    }
    
    void
    hwreset_release(hwreset_t rst)
    {
            free(rst, M_HWRESET);
    }
    
    int
    hwreset_get_by_id(device_t consumer_dev, device_t provider_dev, intptr_t id,
        hwreset_t *rst_out)
    {
            hwreset_t rst;
    
            /* Create handle */
            rst = malloc(sizeof(struct hwreset), M_HWRESET,
                M_WAITOK | M_ZERO);
            rst->consumer_dev = consumer_dev;
            rst->provider_dev = provider_dev;
            rst->rst_id = id;
            *rst_out = rst;
            return (0);
    }
    
    #ifdef FDT
    int
    hwreset_default_ofw_map(device_t provider_dev, phandle_t xref, int ncells,
        pcell_t *cells, intptr_t *id)
   {
           if (ncells == 0)
                   *id = 1;
           else if (ncells == 1)
                   *id = cells[0];
           else
                   return  (ERANGE);
   
           return (0);
   }
   
   int
   hwreset_get_by_ofw_idx(device_t consumer_dev, phandle_t cnode, int idx,
       hwreset_t *rst)
   {
           phandle_t xnode;
           pcell_t *cells;
           device_t rstdev;
           int ncells, rv;
           intptr_t id;
   
           if (cnode <= 0)
                   cnode = ofw_bus_get_node(consumer_dev);
           if (cnode <= 0) {
                   device_printf(consumer_dev,
                       "%s called on not ofw based device\n", __func__);
                   return (ENXIO);
           }
   
           rv = ofw_bus_parse_xref_list_alloc(cnode, "resets", "#reset-cells",
               idx, &xnode, &ncells, &cells);
           if (rv != 0)
                   return (rv);
   
           /* Tranlate provider to device */
           rstdev = OF_device_from_xref(xnode);
           if (rstdev == NULL) {
                   OF_prop_free(cells);
                   return (ENODEV);
           }
           /* Map reset to number */
           rv = HWRESET_MAP(rstdev, xnode, ncells, cells, &id);
           OF_prop_free(cells);
           if (rv != 0)
                   return (rv);
   
           return (hwreset_get_by_id(consumer_dev, rstdev, id, rst));
   }
   
   int
   hwreset_get_by_ofw_name(device_t consumer_dev, phandle_t cnode, char *name,
       hwreset_t *rst)
   {
           int rv, idx;
   
           if (cnode <= 0)
                   cnode = ofw_bus_get_node(consumer_dev);
           if (cnode <= 0) {
                   device_printf(consumer_dev,
                       "%s called on not ofw based device\n",  __func__);
                   return (ENXIO);
           }
           rv = ofw_bus_find_string_index(cnode, "reset-names", name, &idx);
           if (rv != 0)
                   return (rv);
           return (hwreset_get_by_ofw_idx(consumer_dev, cnode, idx, rst));
   }
   
   void
   hwreset_register_ofw_provider(device_t provider_dev)
   {
           phandle_t xref, node;
   
           node = ofw_bus_get_node(provider_dev);
           if (node <= 0)
                   panic("%s called on not ofw based device.\n", __func__);
   
           xref = OF_xref_from_node(node);
           OF_device_register_xref(xref, provider_dev);
   }
   
   void
   hwreset_unregister_ofw_provider(device_t provider_dev)
   {
           phandle_t xref;
   
           xref = OF_xref_from_device(provider_dev);
           OF_device_register_xref(xref, NULL);
   }
   #endif

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