FreeBSD/Linux Kernel Cross Reference
sys/arm64/qoriq/clk/qoriq_clk_pll.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2020 Alstom Group.
      * Copyright (c) 2020 Semihalf.
      *
      * 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/malloc.h>
    
    #include <dev/extres/clk/clk.h>
    #include <dev/extres/clk/clk_fixed.h>
    
    #include <arm64/qoriq/clk/qoriq_clkgen.h>
    
    #include "clkdev_if.h"
    
    struct qoriq_clk_pll_softc {
            bus_addr_t      offset;
    
            uint32_t        mask;
            uint32_t        shift;
    
            uint32_t        flags;
    };
    
    #define WR4(_clk, offset, val)                                  \
            CLKDEV_WRITE_4(clknode_get_device(_clk), offset, val)
    #define RD4(_clk, offset, val)                                  \
            CLKDEV_READ_4(clknode_get_device(_clk), offset, val)
    #define DEVICE_LOCK(_clk)                                       \
            CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
    #define DEVICE_UNLOCK(_clk)                                     \
            CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
    
    #define QORIQ_PLL_KILL_BIT      (1 << 31)
    
    static int
    qoriq_clk_pll_init(struct clknode *clk, device_t dev)
    {
    
            clknode_init_parent_idx(clk, 0);
    
            return (0);
    }
    
    static int
    qoriq_clk_pll_recalc_freq(struct clknode *clk, uint64_t *freq)
    {
            struct qoriq_clk_pll_softc *sc;
            uint32_t mul;
    
            sc = clknode_get_softc(clk);
    
            RD4(clk, sc->offset, &mul);
    
            if (sc->flags & QORIQ_CLK_PLL_HAS_KILL_BIT && mul & QORIQ_PLL_KILL_BIT)
                    return (0);
    
            mul &= sc->mask;
            mul >>= sc->shift;
    
            *freq = *freq * mul;
    
            return (0);
    }
    
    static clknode_method_t qoriq_clk_pll_clknode_methods[] = {
            CLKNODEMETHOD(clknode_init,             qoriq_clk_pll_init),
            CLKNODEMETHOD(clknode_recalc_freq,      qoriq_clk_pll_recalc_freq),
    
            CLKNODEMETHOD_END
    };
   
   DEFINE_CLASS_1(qoriq_clk_pll_clknode, qoriq_clk_pll_clknode_class,
       qoriq_clk_pll_clknode_methods, sizeof(struct qoriq_clk_pll_softc),
       clknode_class);
   
   int
   qoriq_clk_pll_register(struct clkdom *clkdom,
       const struct qoriq_clk_pll_def *clkdef)
   {
           char namebuf[QORIQ_CLK_NAME_MAX_LEN];
           struct qoriq_clk_pll_softc *sc;
           struct clk_fixed_def def;
           const char *parent_name;
           struct clknode *clk;
           int error;
           int i;
   
           clk = clknode_create(clkdom, &qoriq_clk_pll_clknode_class,
               &clkdef->clkdef);
           if (clk == NULL)
                   return (1);
   
           sc = clknode_get_softc(clk);
           sc->mask = clkdef->mask;
           sc->shift = clkdef->shift;
           sc->flags = clkdef->flags;
           sc->offset = clkdef->offset;
   
           clknode_register(clkdom, clk);
   
           parent_name = clkdef->clkdef.name;
   
           def.clkdef.parent_names = &parent_name;
           def.clkdef.parent_cnt = 1;
           def.clkdef.name = namebuf;
           def.mult = 1;
           def.freq = 0;
   
           i = 0;
           while (clkdef->dividers[i] != 0) {
                   def.div = clkdef->dividers[i];
                   def.clkdef.id = clkdef->clkdef.id + i;
                   snprintf(namebuf, QORIQ_CLK_NAME_MAX_LEN, "%s_div%d",
                       parent_name, clkdef->dividers[i]);
   
                   error = clknode_fixed_register(clkdom, &def);
                   if (error != 0)
                           return (error);
   
                   i++;
           }
   
           return (0);
   }

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