aw_clk_np.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2019 Emmanuel Vadot <manu@freebsd.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   20  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   22  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   23  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD$
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/bus.h>
   36 
   37 #include <dev/extres/clk/clk.h>
   38 
   39 #include <arm/allwinner/clkng/aw_clk.h>
   40 #include <arm/allwinner/clkng/aw_clk_np.h>
   41 
   42 #include "clkdev_if.h"
   43 
   44 /*
   45  * clknode for clocks matching the formula :
   46  *
   47  * clk = clkin * n / p
   48  *
   49  */
   50 
   51 struct aw_clk_np_sc {
   52         uint32_t        offset;
   53 
   54         struct aw_clk_factor    n;
   55         struct aw_clk_factor    p;
   56 
   57         uint32_t        gate_shift;
   58         uint32_t        lock_shift;
   59         uint32_t        lock_retries;
   60 
   61         uint32_t        flags;
   62 };
   63 
   64 #define WRITE4(_clk, off, val)                                          \
   65         CLKDEV_WRITE_4(clknode_get_device(_clk), off, val)
   66 #define READ4(_clk, off, val)                                           \
   67         CLKDEV_READ_4(clknode_get_device(_clk), off, val)
   68 #define DEVICE_LOCK(_clk)                                                       \
   69         CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
   70 #define DEVICE_UNLOCK(_clk)                                             \
   71         CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
   72 
   73 static int
   74 aw_clk_np_init(struct clknode *clk, device_t dev)
   75 {
   76 
   77         clknode_init_parent_idx(clk, 0);
   78         return (0);
   79 }
   80 
   81 static int
   82 aw_clk_np_set_gate(struct clknode *clk, bool enable)
   83 {
   84         struct aw_clk_np_sc *sc;
   85         uint32_t val;
   86 
   87         sc = clknode_get_softc(clk);
   88 
   89         if ((sc->flags & AW_CLK_HAS_GATE) == 0)
   90                 return (0);
   91 
   92         DEVICE_LOCK(clk);
   93         READ4(clk, sc->offset, &val);
   94         if (enable)
   95                 val |= (1 << sc->gate_shift);
   96         else
   97                 val &= ~(1 << sc->gate_shift);
   98         WRITE4(clk, sc->offset, val);
   99         DEVICE_UNLOCK(clk);
  100 
  101         return (0);
  102 }
  103 
  104 static uint64_t
  105 aw_clk_np_find_best(struct aw_clk_np_sc *sc, uint64_t fparent, uint64_t *fout,
  106     uint32_t *factor_n, uint32_t *factor_p)
  107 {
  108         uint64_t cur, best;
  109         uint32_t n, p, max_n, max_p, min_n, min_p;
  110 
  111         *factor_n = *factor_p = 0;
  112 
  113         max_n = aw_clk_factor_get_max(&sc->n);
  114         max_p = aw_clk_factor_get_max(&sc->p);
  115         min_n = aw_clk_factor_get_min(&sc->n);
  116         min_p = aw_clk_factor_get_min(&sc->p);
  117 
  118         for (p = min_p; p <= max_p; ) {
  119                 for (n = min_n; n <= max_n; ) {
  120                         cur = fparent * n / p;
  121                         if (abs(*fout - cur) < abs(*fout - best)) {
  122                                 best = cur;
  123                                 *factor_n = n;
  124                                 *factor_p = p;
  125                         }
  126 
  127                         n++;
  128                 }
  129                 p++;
  130         }
  131 
  132         return (best);
  133 }
  134 
  135 static int
  136 aw_clk_np_set_freq(struct clknode *clk, uint64_t fparent, uint64_t *fout,
  137     int flags, int *stop)
  138 {
  139         struct aw_clk_np_sc *sc;
  140         uint64_t cur, best;
  141         uint32_t val, n, p, best_n, best_p;
  142         int retry;
  143 
  144         sc = clknode_get_softc(clk);
  145 
  146         best = cur = 0;
  147 
  148         best = aw_clk_np_find_best(sc, fparent, fout,
  149             &best_n, &best_p);
  150 
  151         if ((flags & CLK_SET_DRYRUN) != 0) {
  152                 *fout = best;
  153                 *stop = 1;
  154                 return (0);
  155         }
  156 
  157         if ((best < *fout) &&
  158           ((flags & CLK_SET_ROUND_DOWN) == 0)) {
  159                 *stop = 1;
  160                 return (ERANGE);
  161         }
  162         if ((best > *fout) &&
  163           ((flags & CLK_SET_ROUND_UP) == 0)) {
  164                 *stop = 1;
  165                 return (ERANGE);
  166         }
  167 
  168         DEVICE_LOCK(clk);
  169         READ4(clk, sc->offset, &val);
  170 
  171         n = aw_clk_factor_get_value(&sc->n, best_n);
  172         p = aw_clk_factor_get_value(&sc->p, best_p);
  173         val &= ~sc->n.mask;
  174         val &= ~sc->p.mask;
  175         val |= n << sc->n.shift;
  176         val |= p << sc->p.shift;
  177 
  178         WRITE4(clk, sc->offset, val);
  179         DEVICE_UNLOCK(clk);
  180 
  181         if ((sc->flags & AW_CLK_HAS_LOCK) != 0) {
  182                 for (retry = 0; retry < sc->lock_retries; retry++) {
  183                         READ4(clk, sc->offset, &val);
  184                         if ((val & (1 << sc->lock_shift)) != 0)
  185                                 break;
  186                         DELAY(1000);
  187                 }
  188         }
  189 
  190         *fout = best;
  191         *stop = 1;
  192 
  193         return (0);
  194 }
  195 
  196 static int
  197 aw_clk_np_recalc(struct clknode *clk, uint64_t *freq)
  198 {
  199         struct aw_clk_np_sc *sc;
  200         uint32_t val, n, p;
  201 
  202         sc = clknode_get_softc(clk);
  203 
  204         DEVICE_LOCK(clk);
  205         READ4(clk, sc->offset, &val);
  206         DEVICE_UNLOCK(clk);
  207 
  208         n = aw_clk_get_factor(val, &sc->n);
  209         p = aw_clk_get_factor(val, &sc->p);
  210 
  211         *freq = *freq * n / p;
  212 
  213         return (0);
  214 }
  215 
  216 static clknode_method_t aw_np_clknode_methods[] = {
  217         /* Device interface */
  218         CLKNODEMETHOD(clknode_init,             aw_clk_np_init),
  219         CLKNODEMETHOD(clknode_set_gate,         aw_clk_np_set_gate),
  220         CLKNODEMETHOD(clknode_recalc_freq,      aw_clk_np_recalc),
  221         CLKNODEMETHOD(clknode_set_freq,         aw_clk_np_set_freq),
  222         CLKNODEMETHOD_END
  223 };
  224 
  225 DEFINE_CLASS_1(aw_np_clknode, aw_np_clknode_class, aw_np_clknode_methods,
  226     sizeof(struct aw_clk_np_sc), clknode_class);
  227 
  228 int
  229 aw_clk_np_register(struct clkdom *clkdom, struct aw_clk_np_def *clkdef)
  230 {
  231         struct clknode *clk;
  232         struct aw_clk_np_sc *sc;
  233 
  234         clk = clknode_create(clkdom, &aw_np_clknode_class, &clkdef->clkdef);
  235         if (clk == NULL)
  236                 return (1);
  237 
  238         sc = clknode_get_softc(clk);
  239 
  240         sc->offset = clkdef->offset;
  241 
  242         sc->n.shift = clkdef->n.shift;
  243         sc->n.width = clkdef->n.width;
  244         sc->n.mask = ((1 << sc->n.width) - 1) << sc->n.shift;
  245         sc->n.value = clkdef->n.value;
  246         sc->n.flags = clkdef->n.flags;
  247 
  248         sc->p.shift = clkdef->p.shift;
  249         sc->p.width = clkdef->p.width;
  250         sc->p.mask = ((1 << sc->p.width) - 1) << sc->p.shift;
  251         sc->p.value = clkdef->p.value;
  252         sc->p.flags = clkdef->p.flags;
  253 
  254         sc->gate_shift = clkdef->gate_shift;
  255 
  256         sc->lock_shift = clkdef->lock_shift;
  257         sc->lock_retries = clkdef->lock_retries;
  258 
  259         sc->flags = clkdef->flags;
  260 
  261         clknode_register(clkdom, clk);
  262 
  263         return (0);
  264 }

Cache object: c4dfc92aac059d2babdcd7b5202dbbfa

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

FreeBSD/Linux Kernel Cross Reference sys/arm/allwinner/clkng/aw_clk_np.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/allwinner/clkng/aw_clk_np.c