FreeBSD/Linux Kernel Cross Reference
sys/arm/ti/clk/clock_common.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * 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.
     *
     * $FreeBSD$
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/conf.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/systm.h>
    #include <sys/libkern.h>
    #include <sys/types.h>
    #include <sys/malloc.h>
    
    #include <machine/bus.h>
    #include <dev/fdt/simplebus.h>
    
    #include <dev/extres/clk/clk_mux.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include "clock_common.h"
    
    #if 0
    #define DPRINTF(dev, msg...) device_printf(dev, msg)
    #else
    #define DPRINTF(dev, msg...)
    #endif
    
    void
    read_clock_cells(device_t dev, struct clock_cell_info *clk) {
            ssize_t numbytes_clocks;
            phandle_t node, parent, *cells;
            int index, ncells, rv;
    
            node = ofw_bus_get_node(dev);
    
            /* Get names of parent clocks */
            numbytes_clocks = OF_getproplen(node, "clocks");
            clk->num_clock_cells = numbytes_clocks / sizeof(cell_t);
    
            /* Allocate space and get clock cells content */
            /* clock_cells / clock_cells_ncells will be freed in
             * find_parent_clock_names()
             */
            clk->clock_cells = malloc(numbytes_clocks, M_DEVBUF, M_WAITOK|M_ZERO);
            clk->clock_cells_ncells = malloc(clk->num_clock_cells*sizeof(uint8_t),
                    M_DEVBUF, M_WAITOK|M_ZERO);
            OF_getencprop(node, "clocks", clk->clock_cells, numbytes_clocks);
    
            /* Count number of clocks */
            clk->num_real_clocks = 0;
            for (index = 0; index < clk->num_clock_cells; index++) {
                    rv = ofw_bus_parse_xref_list_alloc(node, "clocks", "#clock-cells",
                            clk->num_real_clocks, &parent, &ncells, &cells);
                    if (rv != 0)
                            continue;
    
                    if (cells != NULL)
                            OF_prop_free(cells);
    
                    clk->clock_cells_ncells[index] = ncells;
                    index += ncells;
                    clk->num_real_clocks++;
            }
    }
    
    int
    find_parent_clock_names(device_t dev, struct clock_cell_info *clk, struct clknode_init_def *def) {
            int     index, clock_index, err;
            bool    found_all = true;
           clk_t   parent;
   
           /* Figure out names */
           for (index = 0, clock_index = 0; index < clk->num_clock_cells; index++) {
                   /* Get name of parent clock */
                   err = clk_get_by_ofw_index(dev, 0, clock_index, &parent);
                   if (err != 0) {
                           clock_index++;
                           found_all = false;
                           DPRINTF(dev, "Failed to find clock_cells[%d]=0x%x\n",
                                   index, clk->clock_cells[index]);
   
                           index += clk->clock_cells_ncells[index];
                           continue;
                   }
   
                   def->parent_names[clock_index] = clk_get_name(parent);
                   clk_release(parent);
   
                   DPRINTF(dev, "Found parent clock[%d/%d]: %s\n",
                           clock_index, clk->num_real_clocks,
                           def->parent_names[clock_index]);
   
                   clock_index++;
                   index += clk->clock_cells_ncells[index];
           }
   
           if (!found_all) {
                   return 1;
           }
   
           free(clk->clock_cells, M_DEVBUF);
           free(clk->clock_cells_ncells, M_DEVBUF);
           return 0;
   }
   
   void
   create_clkdef(device_t dev, struct clock_cell_info *clk, struct clknode_init_def *def) {
           def->id = 1;
   
           clk_parse_ofw_clk_name(dev, ofw_bus_get_node(dev), &def->name);
   
           DPRINTF(dev, "node name: %s\n", def->name);
   
           def->parent_cnt = clk->num_real_clocks;
           def->parent_names = malloc(clk->num_real_clocks*sizeof(char *),
                                            M_OFWPROP, M_WAITOK);
   }
   void
   free_clkdef(struct clknode_init_def *def) {
           OF_prop_free(__DECONST(char *, def->name));
           OF_prop_free(def->parent_names);
   }

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