am335x_pwmss.c

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    1 /*-
    2  * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 #include <sys/kernel.h>
   34 #include <sys/limits.h>
   35 #include <sys/lock.h>
   36 #include <sys/module.h>
   37 #include <sys/mutex.h>
   38 #include <sys/resource.h>
   39 #include <sys/rman.h>
   40 #include <sys/sysctl.h>
   41 
   42 #include <machine/bus.h>
   43 
   44 #include <dev/fdt/simplebus.h>
   45 #include <dev/ofw/openfirm.h>
   46 #include <dev/ofw/ofw_bus.h>
   47 #include <dev/ofw/ofw_bus_subr.h>
   48 
   49 #include <arm/ti/ti_sysc.h>
   50 
   51 #include <dev/extres/syscon/syscon.h>
   52 #include "syscon_if.h"
   53 
   54 #include "am335x_pwm.h"
   55 #include "am335x_scm.h"
   56 
   57 #define PWMSS_IDVER             0x00
   58 #define PWMSS_SYSCONFIG         0x04
   59 #define PWMSS_CLKCONFIG         0x08
   60 #define         CLKCONFIG_EPWMCLK_EN    (1 << 8)
   61 #define PWMSS_CLKSTATUS         0x0C
   62 
   63 /* TRM chapter 2 memory map table 2-3 + VER register location */
   64 #define PWMSS_REV_0             0x0000
   65 #define PWMSS_REV_1             0x2000
   66 #define PWMSS_REV_2             0x4000
   67 
   68 static device_probe_t am335x_pwmss_probe;
   69 static device_attach_t am335x_pwmss_attach;
   70 static device_detach_t am335x_pwmss_detach;
   71 
   72 struct am335x_pwmss_softc {
   73         struct simplebus_softc  sc_simplebus;
   74         device_t                sc_dev;
   75         struct syscon           *syscon;
   76 };
   77 
   78 static device_method_t am335x_pwmss_methods[] = {
   79         DEVMETHOD(device_probe,         am335x_pwmss_probe),
   80         DEVMETHOD(device_attach,        am335x_pwmss_attach),
   81         DEVMETHOD(device_detach,        am335x_pwmss_detach),
   82 
   83         DEVMETHOD_END
   84 };
   85 
   86 static int
   87 am335x_pwmss_probe(device_t dev)
   88 {
   89 
   90         if (!ofw_bus_status_okay(dev))
   91                 return (ENXIO);
   92 
   93         if (!ofw_bus_is_compatible(dev, "ti,am33xx-pwmss"))
   94                 return (ENXIO);
   95 
   96         device_set_desc(dev, "AM335x PWM");
   97 
   98         return (BUS_PROBE_DEFAULT);
   99 }
  100 
  101 static int
  102 am335x_pwmss_attach(device_t dev)
  103 {
  104         struct am335x_pwmss_softc *sc;
  105         uint32_t reg, id;
  106         uint64_t rev_address;
  107         phandle_t node, opp_table;
  108 
  109         sc = device_get_softc(dev);
  110         sc->sc_dev = dev;
  111 
  112         /* FIXME: For now; Go and kidnap syscon from opp-table */
  113         opp_table = OF_finddevice("/opp-table");
  114         if (opp_table == -1) {
  115                 device_printf(dev, "Cant find /opp-table\n");
  116                 return (ENXIO);
  117         }
  118         if (!OF_hasprop(opp_table, "syscon")) {
  119                 device_printf(dev, "/opp-table doesnt have required syscon property\n");
  120                 return (ENXIO);
  121         }
  122         if (syscon_get_by_ofw_property(dev, opp_table, "syscon", &sc->syscon) != 0) {
  123                 device_printf(dev, "Failed to get syscon\n");
  124                 return (ENXIO);
  125         }
  126 
  127         ti_sysc_clock_enable(device_get_parent(dev));
  128 
  129         rev_address = ti_sysc_get_rev_address(device_get_parent(dev));
  130         switch (rev_address) {
  131         case PWMSS_REV_0:
  132                 id = 0;
  133                 break;
  134         case PWMSS_REV_1:
  135                 id = 1;
  136                 break;
  137         case PWMSS_REV_2:
  138                 id = 2;
  139                 break;
  140         }
  141 
  142         reg = SYSCON_READ_4(sc->syscon, SCM_PWMSS_CTRL);
  143         reg |= (1 << id);
  144         SYSCON_WRITE_4(sc->syscon, SCM_PWMSS_CTRL, reg);
  145 
  146         node = ofw_bus_get_node(dev);
  147 
  148         if (node == -1)
  149                 return (ENXIO);
  150 
  151         simplebus_init(dev, node);
  152 
  153         /*
  154          * Allow devices to identify.
  155          */
  156         bus_generic_probe(dev);
  157 
  158         /*
  159          * Now walk the OFW tree and attach top-level devices.
  160          */
  161         for (node = OF_child(node); node > 0; node = OF_peer(node))
  162                 simplebus_add_device(dev, node, 0, NULL, -1, NULL);
  163 
  164         return (bus_generic_attach(dev));
  165 }
  166 
  167 static int
  168 am335x_pwmss_detach(device_t dev)
  169 {
  170 
  171         return (0);
  172 }
  173 
  174 DEFINE_CLASS_1(am335x_pwmss, am335x_pwmss_driver, am335x_pwmss_methods,
  175     sizeof(struct am335x_pwmss_softc), simplebus_driver);
  176 DRIVER_MODULE(am335x_pwmss, simplebus, am335x_pwmss_driver, 0, 0);
  177 MODULE_VERSION(am335x_pwmss, 1);
  178 MODULE_DEPEND(am335x_pwmss, ti_sysc, 1, 1, 1);

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FreeBSD/Linux Kernel Cross Reference sys/arm/ti/am335x/am335x_pwmss.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/ti/am335x/am335x_pwmss.c