ti_mux_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 #include <sys/types.h>
   41 #include <sys/malloc.h>
   42 
   43 #include <machine/bus.h>
   44 #include <dev/fdt/simplebus.h>
   45 
   46 #include <dev/extres/clk/clk_mux.h>
   47 #include <dev/ofw/ofw_bus.h>
   48 #include <dev/ofw/ofw_bus_subr.h>
   49 
   50 #include "clock_common.h"
   51 
   52 #if 0
   53 #define DPRINTF(dev, msg...) device_printf(dev, msg)
   54 #else
   55 #define DPRINTF(dev, msg...)
   56 #endif
   57 
   58 /*
   59  * Devicetree description
   60  * Documentation/devicetree/bindings/clock/ti/mux.txt
   61  */
   62 
   63 struct ti_mux_softc {
   64         device_t                sc_dev;
   65         bool                    attach_done;
   66 
   67         struct clk_mux_def      mux_def;
   68         struct clock_cell_info  clock_cell;
   69         struct clkdom           *clkdom;
   70 };
   71 
   72 static int ti_mux_probe(device_t dev);
   73 static int ti_mux_attach(device_t dev);
   74 static int ti_mux_detach(device_t dev);
   75 
   76 #define TI_MUX_CLOCK                    2
   77 #define TI_COMPOSITE_MUX_CLOCK          1
   78 #define TI_MUX_END                      0
   79 
   80 static struct ofw_compat_data compat_data[] = {
   81         { "ti,mux-clock",               TI_MUX_CLOCK },
   82         { "ti,composite-mux-clock",     TI_COMPOSITE_MUX_CLOCK },
   83         { NULL,                         TI_MUX_END }
   84 };
   85 
   86 static int
   87 ti_mux_probe(device_t dev)
   88 {
   89         if (!ofw_bus_status_okay(dev))
   90                 return (ENXIO);
   91 
   92         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
   93                 return (ENXIO);
   94 
   95         device_set_desc(dev, "TI Mux Clock");
   96 
   97         return (BUS_PROBE_DEFAULT);
   98 }
   99 
  100 static int
  101 register_clk(struct ti_mux_softc *sc) {
  102         int err;
  103 
  104         sc->clkdom = clkdom_create(sc->sc_dev);
  105         if (sc->clkdom == NULL) {
  106                 DPRINTF(sc->sc_dev, "Failed to create clkdom\n");
  107                 return ENXIO;
  108         }
  109 
  110         err = clknode_mux_register(sc->clkdom, &sc->mux_def);
  111         if (err) {
  112                 DPRINTF(sc->sc_dev, "clknode_mux_register failed %x\n", err);
  113                 return ENXIO;
  114         }
  115 
  116         err = clkdom_finit(sc->clkdom);
  117         if (err) {
  118                 DPRINTF(sc->sc_dev, "Clk domain finit fails %x.\n", err);
  119                 return ENXIO;
  120         }
  121 
  122         return 0;
  123 }
  124 
  125 static int
  126 ti_mux_attach(device_t dev)
  127 {
  128         struct ti_mux_softc *sc;
  129         phandle_t node;
  130         int err;
  131         cell_t value;
  132 
  133         sc = device_get_softc(dev);
  134         sc->sc_dev = dev;
  135         node = ofw_bus_get_node(dev);
  136 
  137         /* Grab the content of reg properties */
  138         OF_getencprop(node, "reg", &value, sizeof(value));
  139         sc->mux_def.offset = value;
  140 
  141         if (OF_hasprop(node, "ti,bit-shift")) {
  142                 OF_getencprop(node, "ti,bit-shift", &value, sizeof(value));
  143                 sc->mux_def.shift = value;
  144                 DPRINTF(sc->sc_dev, "ti,bit-shift => shift %x\n", sc->mux_def.shift);
  145         }
  146         if (OF_hasprop(node, "ti,index-starts-at-one")) {
  147                 /* FIXME: Add support in dev/extres/clk */
  148                 /*sc->mux_def.mux_flags =  ... */
  149                 device_printf(sc->sc_dev, "ti,index-starts-at-one - Not implemented\n");
  150         }
  151 
  152         if (OF_hasprop(node, "ti,set-rate-parent"))
  153                 device_printf(sc->sc_dev, "ti,set-rate-parent - Not implemented\n");
  154         if (OF_hasprop(node, "ti,latch-bit"))
  155                 device_printf(sc->sc_dev, "ti,latch-bit - Not implemented\n");
  156 
  157         read_clock_cells(sc->sc_dev, &sc->clock_cell);
  158 
  159         create_clkdef(sc->sc_dev, &sc->clock_cell, &sc->mux_def.clkdef);
  160 
  161         /* Figure out the width from ti_max_div */
  162         if (sc->mux_def.mux_flags)
  163                 sc->mux_def.width = fls(sc->clock_cell.num_real_clocks-1);
  164         else
  165                 sc->mux_def.width = fls(sc->clock_cell.num_real_clocks);
  166 
  167         DPRINTF(sc->sc_dev, "sc->clock_cell.num_real_clocks %x def.width %x\n",
  168                 sc->clock_cell.num_real_clocks, sc->mux_def.width);
  169 
  170         err = find_parent_clock_names(sc->sc_dev, &sc->clock_cell, &sc->mux_def.clkdef);
  171 
  172         if (err) {
  173                 /* free_clkdef will be called in ti_mux_new_pass */
  174                 DPRINTF(sc->sc_dev, "find_parent_clock_names failed\n");
  175                 return (bus_generic_attach(sc->sc_dev));
  176         }
  177 
  178         err = register_clk(sc);
  179 
  180         if (err) {
  181                 /* free_clkdef will be called in ti_mux_new_pass */
  182                 DPRINTF(sc->sc_dev, "register_clk failed\n");
  183                 return (bus_generic_attach(sc->sc_dev));
  184         }
  185 
  186         sc->attach_done = true;
  187 
  188         free_clkdef(&sc->mux_def.clkdef);
  189 
  190         return (bus_generic_attach(sc->sc_dev));
  191 }
  192 
  193 static void
  194 ti_mux_new_pass(device_t dev)
  195 {
  196         struct ti_mux_softc *sc;
  197         int err;
  198 
  199         sc = device_get_softc(dev);
  200 
  201         if (sc->attach_done) {
  202                 return;
  203         }
  204 
  205         err = find_parent_clock_names(sc->sc_dev, &sc->clock_cell, &sc->mux_def.clkdef);
  206         if (err) {
  207                 /* free_clkdef will be called in later call to ti_mux_new_pass */
  208                 DPRINTF(sc->sc_dev, "ti_mux_new_pass find_parent_clock_names failed\n");
  209                 return;
  210         }
  211 
  212         err = register_clk(sc);
  213         if (err) {
  214                 /* free_clkdef will be called in later call to ti_mux_new_pass */
  215                 DPRINTF(sc->sc_dev, "ti_mux_new_pass register_clk failed\n");
  216                 return;
  217         }
  218 
  219         sc->attach_done = true;
  220 
  221         free_clkdef(&sc->mux_def.clkdef);
  222 }
  223 
  224 static int
  225 ti_mux_detach(device_t dev)
  226 {
  227         return (EBUSY);
  228 }
  229 
  230 static device_method_t ti_mux_methods[] = {
  231         /* Device interface */
  232         DEVMETHOD(device_probe,         ti_mux_probe),
  233         DEVMETHOD(device_attach,        ti_mux_attach),
  234         DEVMETHOD(device_detach,        ti_mux_detach),
  235 
  236         /* Bus interface */
  237         DEVMETHOD(bus_new_pass,         ti_mux_new_pass),
  238 
  239         DEVMETHOD_END
  240 };
  241 
  242 DEFINE_CLASS_0(ti_mux, ti_mux_driver, ti_mux_methods,
  243         sizeof(struct ti_mux_softc));
  244 
  245 EARLY_DRIVER_MODULE(ti_mux, simplebus, ti_mux_driver, 0, 0,
  246     BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
  247 MODULE_VERSION(ti_mux, 1);

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

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