ti_divider_clock.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2020 Oskar Holmlund <oskar.holmlund@ohdata.se>
    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/conf.h>
   35 #include <sys/bus.h>
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 #include <sys/systm.h>
   39 #include <sys/libkern.h>
   40 
   41 #include <machine/bus.h>
   42 #include <dev/fdt/simplebus.h>
   43 
   44 #include <dev/extres/clk/clk_div.h>
   45 #include <dev/ofw/ofw_bus.h>
   46 #include <dev/ofw/ofw_bus_subr.h>
   47 
   48 #include "clock_common.h"
   49 
   50 #if 0
   51 #define DPRINTF(dev, msg...) device_printf(dev, msg)
   52 #else
   53 #define DPRINTF(dev, msg...)
   54 #endif
   55 
   56 /*
   57  * Devicetree description
   58  * Documentation/devicetree/bindings/clock/ti/divider.txt
   59  */
   60 
   61 struct ti_divider_softc {
   62         device_t                sc_dev;
   63         bool                    attach_done;
   64         struct clk_div_def      div_def;
   65 
   66         struct clock_cell_info  clock_cell;
   67         struct clkdom           *clkdom;
   68 };
   69 
   70 static int ti_divider_probe(device_t dev);
   71 static int ti_divider_attach(device_t dev);
   72 static int ti_divider_detach(device_t dev);
   73 
   74 #define TI_DIVIDER_CLOCK                2
   75 #define TI_COMPOSITE_DIVIDER_CLOCK      1
   76 #define TI_DIVIDER_END                  0
   77 
   78 static struct ofw_compat_data compat_data[] = {
   79         { "ti,divider-clock",           TI_DIVIDER_CLOCK },
   80         { "ti,composite-divider-clock", TI_COMPOSITE_DIVIDER_CLOCK },
   81         { NULL,                         TI_DIVIDER_END }
   82 };
   83 
   84 static int
   85 register_clk(struct ti_divider_softc *sc) {
   86         int err;
   87 
   88         sc->clkdom = clkdom_create(sc->sc_dev);
   89         if (sc->clkdom == NULL) {
   90                 DPRINTF(sc->sc_dev, "Failed to create clkdom\n");
   91                 return (ENXIO);
   92         }
   93 
   94         err = clknode_div_register(sc->clkdom, &sc->div_def);
   95         if (err) {
   96                 DPRINTF(sc->sc_dev, "clknode_div_register failed %x\n", err);
   97                 return (ENXIO);
   98         }
   99 
  100         err = clkdom_finit(sc->clkdom);
  101         if (err) {
  102                 DPRINTF(sc->sc_dev, "Clk domain finit fails %x.\n", err);
  103                 return (ENXIO);
  104         }
  105 
  106         return (0);
  107 }
  108 
  109 static int
  110 ti_divider_probe(device_t dev)
  111 {
  112         if (!ofw_bus_status_okay(dev))
  113                 return (ENXIO);
  114 
  115         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
  116                 return (ENXIO);
  117 
  118         device_set_desc(dev, "TI Divider Clock");
  119 
  120         return (BUS_PROBE_DEFAULT);
  121 }
  122 
  123 static int
  124 ti_divider_attach(device_t dev)
  125 {
  126         struct ti_divider_softc *sc;
  127         phandle_t       node;
  128         int             err;
  129         cell_t          value;
  130         uint32_t        ti_max_div;
  131 
  132         sc = device_get_softc(dev);
  133         sc->sc_dev = dev;
  134         node = ofw_bus_get_node(dev);
  135 
  136         /* Grab the content of reg properties */
  137         OF_getencprop(node, "reg", &value, sizeof(value));
  138         sc->div_def.offset = value;
  139 
  140         if (OF_hasprop(node, "ti,bit-shift")) {
  141                 OF_getencprop(node, "ti,bit-shift", &value, sizeof(value));
  142                 sc->div_def.i_shift = value;
  143         }
  144 
  145         if (OF_hasprop(node, "ti,index-starts-at-one")) {
  146                 sc->div_def.div_flags = CLK_DIV_ZERO_BASED;
  147         }
  148 
  149         if (OF_hasprop(node, "ti,index-power-of-two")) {
  150                 /* FIXME: later */
  151                 device_printf(sc->sc_dev, "ti,index-power-of-two - Not implemented\n");
  152                 /* remember to update i_width a few lines below */
  153         }
  154         if (OF_hasprop(node, "ti,max-div")) {
  155                 OF_getencprop(node, "ti,max-div", &value, sizeof(value));
  156                 ti_max_div = value;
  157         }
  158 
  159         if (OF_hasprop(node, "clock-output-names"))
  160                 device_printf(sc->sc_dev, "clock-output-names\n");
  161         if (OF_hasprop(node, "ti,dividers"))
  162                 device_printf(sc->sc_dev, "ti,dividers\n");
  163         if (OF_hasprop(node, "ti,min-div"))
  164                 device_printf(sc->sc_dev, "ti,min-div - Not implemented\n");
  165 
  166         if (OF_hasprop(node, "ti,autoidle-shift"))
  167                 device_printf(sc->sc_dev, "ti,autoidle-shift - Not implemented\n");
  168         if (OF_hasprop(node, "ti,set-rate-parent"))
  169                 device_printf(sc->sc_dev, "ti,set-rate-parent - Not implemented\n");
  170         if (OF_hasprop(node, "ti,latch-bit"))
  171                 device_printf(sc->sc_dev, "ti,latch-bit - Not implemented\n");
  172 
  173         /* Figure out the width from ti_max_div */
  174         if (sc->div_def.div_flags)
  175                 sc->div_def.i_width = fls(ti_max_div-1);
  176         else
  177                 sc->div_def.i_width = fls(ti_max_div);
  178 
  179         DPRINTF(sc->sc_dev, "div_def.i_width %x\n", sc->div_def.i_width);
  180 
  181         read_clock_cells(sc->sc_dev, &sc->clock_cell);
  182 
  183         create_clkdef(sc->sc_dev, &sc->clock_cell, &sc->div_def.clkdef);
  184 
  185         err = find_parent_clock_names(sc->sc_dev, &sc->clock_cell, &sc->div_def.clkdef);
  186 
  187         if (err) {
  188                 /* free_clkdef will be called in ti_divider_new_pass */
  189                 DPRINTF(sc->sc_dev, "find_parent_clock_names failed\n");
  190                 return (bus_generic_attach(sc->sc_dev));
  191         }
  192 
  193         err = register_clk(sc);
  194 
  195         if (err) {
  196                 /* free_clkdef will be called in ti_divider_new_pass */
  197                 DPRINTF(sc->sc_dev, "register_clk failed\n");
  198                 return (bus_generic_attach(sc->sc_dev));
  199         }
  200 
  201         sc->attach_done = true;
  202 
  203         free_clkdef(&sc->div_def.clkdef);
  204 
  205         return (bus_generic_attach(sc->sc_dev));
  206 }
  207 
  208 static int
  209 ti_divider_detach(device_t dev)
  210 {
  211         return (EBUSY);
  212 }
  213 
  214 static void
  215 ti_divider_new_pass(device_t dev)
  216 {
  217         struct ti_divider_softc *sc;
  218         int err;
  219 
  220         sc = device_get_softc(dev);
  221 
  222         if (sc->attach_done) {
  223                 return;
  224         }
  225 
  226         err = find_parent_clock_names(sc->sc_dev, &sc->clock_cell, &sc->div_def.clkdef);
  227         if (err) {
  228                 /* free_clkdef will be called in a later call to ti_divider_new_pass */
  229                 DPRINTF(sc->sc_dev, "new_pass find_parent_clock_names failed\n");
  230                 return;
  231         }
  232 
  233         err = register_clk(sc);
  234         if (err) {
  235                 /* free_clkdef will be called in a later call to ti_divider_new_pass */
  236                 DPRINTF(sc->sc_dev, "new_pass register_clk failed\n");
  237                 return;
  238         }
  239 
  240         sc->attach_done = true;
  241 
  242         free_clkdef(&sc->div_def.clkdef);
  243 }
  244 
  245 static device_method_t ti_divider_methods[] = {
  246         /* Device interface */
  247         DEVMETHOD(device_probe,         ti_divider_probe),
  248         DEVMETHOD(device_attach,        ti_divider_attach),
  249         DEVMETHOD(device_detach,        ti_divider_detach),
  250 
  251         /* Bus interface */
  252         DEVMETHOD(bus_new_pass,         ti_divider_new_pass),
  253 
  254         DEVMETHOD_END
  255 };
  256 
  257 DEFINE_CLASS_0(ti_divider, ti_divider_driver, ti_divider_methods,
  258         sizeof(struct ti_divider_softc));
  259 
  260 EARLY_DRIVER_MODULE(ti_divider, simplebus, ti_divider_driver, 0, 0,
  261     BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
  262 MODULE_VERSION(ti_divider, 1);

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

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