The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/allwinner/aw_ccu.c

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    1 /*-
    2  * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   18  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   20  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   21  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  *
   25  * $FreeBSD$
   26  */
   27 
   28 /*
   29  * Allwinner oscillator clock
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD$");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/bus.h>
   38 #include <sys/rman.h>
   39 #include <sys/kernel.h>
   40 #include <sys/lock.h>
   41 #include <sys/module.h>
   42 #include <sys/mutex.h>
   43 #include <machine/bus.h>
   44 
   45 #include <dev/fdt/simplebus.h>
   46 
   47 #include <dev/ofw/ofw_bus.h>
   48 #include <dev/ofw/ofw_bus_subr.h>
   49 
   50 #include <dev/extres/clk/clk.h>
   51 
   52 #include "clkdev_if.h"
   53 
   54 #define CCU_BASE        0x01c20000
   55 #define CCU_SIZE        0x400
   56 
   57 struct aw_ccu_softc {
   58         struct simplebus_softc  sc;
   59         bus_space_tag_t         bst;
   60         bus_space_handle_t      bsh;
   61         struct mtx              mtx;
   62         int                     flags;
   63 };
   64 
   65 static struct ofw_compat_data compat_data[] = {
   66         { "allwinner,sun7i-a20",        1 },
   67         { "allwinner,sun6i-a31",        1 },
   68         { "allwinner,sun6i-a31s",       1 },
   69         { NULL, 0 }
   70 };
   71 
   72 static int
   73 aw_ccu_check_addr(struct aw_ccu_softc *sc, bus_addr_t addr,
   74     bus_space_handle_t *pbsh, bus_size_t *poff)
   75 {
   76         if (addr >= CCU_BASE && addr < (CCU_BASE + CCU_SIZE)) {
   77                 *poff = addr - CCU_BASE;
   78                 *pbsh = sc->bsh;
   79                 return (0);
   80         }
   81         return (EINVAL);
   82 }
   83 
   84 static int
   85 aw_ccu_write_4(device_t dev, bus_addr_t addr, uint32_t val)
   86 {
   87         struct aw_ccu_softc *sc;
   88         bus_space_handle_t bsh;
   89         bus_size_t reg;
   90 
   91         sc = device_get_softc(dev);
   92 
   93         if (aw_ccu_check_addr(sc, addr, &bsh, &reg) != 0)
   94                 return (EINVAL);
   95 
   96         mtx_assert(&sc->mtx, MA_OWNED);
   97         bus_space_write_4(sc->bst, bsh, reg, val);
   98 
   99         return (0);
  100 }
  101 
  102 static int
  103 aw_ccu_read_4(device_t dev, bus_addr_t addr, uint32_t *val)
  104 {
  105         struct aw_ccu_softc *sc;
  106         bus_space_handle_t bsh;
  107         bus_size_t reg;
  108 
  109         sc = device_get_softc(dev);
  110 
  111         if (aw_ccu_check_addr(sc, addr, &bsh, &reg) != 0)
  112                 return (EINVAL);
  113 
  114         mtx_assert(&sc->mtx, MA_OWNED);
  115         *val = bus_space_read_4(sc->bst, bsh, reg);
  116 
  117         return (0);
  118 }
  119 
  120 static int
  121 aw_ccu_modify_4(device_t dev, bus_addr_t addr, uint32_t clr, uint32_t set)
  122 {
  123         struct aw_ccu_softc *sc;
  124         bus_space_handle_t bsh;
  125         bus_size_t reg;
  126         uint32_t val;
  127 
  128         sc = device_get_softc(dev);
  129 
  130         if (aw_ccu_check_addr(sc, addr, &bsh, &reg) != 0)
  131                 return (EINVAL);
  132 
  133         mtx_assert(&sc->mtx, MA_OWNED);
  134         val = bus_space_read_4(sc->bst, bsh, reg);
  135         val &= ~clr;
  136         val |= set;
  137         bus_space_write_4(sc->bst, bsh, reg, val);
  138 
  139         return (0);
  140 }
  141 
  142 static void
  143 aw_ccu_device_lock(device_t dev)
  144 {
  145         struct aw_ccu_softc *sc;
  146 
  147         sc = device_get_softc(dev);
  148         mtx_lock(&sc->mtx);
  149 }
  150 
  151 static void
  152 aw_ccu_device_unlock(device_t dev)
  153 {
  154         struct aw_ccu_softc *sc;
  155 
  156         sc = device_get_softc(dev);
  157         mtx_unlock(&sc->mtx);
  158 }
  159 
  160 static const struct ofw_compat_data *
  161 aw_ccu_search_compatible(void) 
  162 {
  163         const struct ofw_compat_data *compat;
  164         phandle_t root;
  165 
  166         root = OF_finddevice("/");
  167         for (compat = compat_data; compat->ocd_str != NULL; compat++)
  168                 if (ofw_bus_node_is_compatible(root, compat->ocd_str))
  169                         break;
  170 
  171         return (compat);
  172 }
  173 
  174 static int
  175 aw_ccu_probe(device_t dev)
  176 {
  177         const char *name;
  178 
  179         name = ofw_bus_get_name(dev);
  180 
  181         if (name == NULL || strcmp(name, "clocks") != 0)
  182                 return (ENXIO);
  183 
  184         if (aw_ccu_search_compatible()->ocd_data == 0)
  185                 return (ENXIO);
  186 
  187         device_set_desc(dev, "Allwinner Clock Control Unit");
  188         return (BUS_PROBE_SPECIFIC);
  189 }
  190 
  191 static int
  192 aw_ccu_attach(device_t dev)
  193 {
  194         struct aw_ccu_softc *sc;
  195         phandle_t node, child;
  196         device_t cdev;
  197         int error;
  198 
  199         sc = device_get_softc(dev);
  200         node = ofw_bus_get_node(dev);
  201 
  202         simplebus_init(dev, node);
  203 
  204         sc->flags = aw_ccu_search_compatible()->ocd_data;
  205 
  206         /*
  207          * Map registers. The DT doesn't have a "reg" property
  208          * for the /clocks node and child nodes have conflicting "reg"
  209          * properties.
  210          */
  211         sc->bst = bus_get_bus_tag(dev);
  212         error = bus_space_map(sc->bst, CCU_BASE, CCU_SIZE, 0,
  213             &sc->bsh);
  214         if (error != 0) {
  215                 device_printf(dev, "couldn't map CCU: %d\n", error);
  216                 return (error);
  217         }
  218 
  219         mtx_init(&sc->mtx, device_get_nameunit(dev), NULL, MTX_DEF);
  220 
  221         /* Attach child devices */
  222         for (child = OF_child(node); child > 0; child = OF_peer(child)) {
  223                 cdev = simplebus_add_device(dev, child, 0, NULL, -1, NULL);
  224                 if (cdev != NULL)
  225                         device_probe_and_attach(cdev);
  226         }
  227 
  228         return (bus_generic_attach(dev));
  229 }
  230 
  231 static device_method_t aw_ccu_methods[] = {
  232         /* Device interface */
  233         DEVMETHOD(device_probe,         aw_ccu_probe),
  234         DEVMETHOD(device_attach,        aw_ccu_attach),
  235 
  236         /* clkdev interface */
  237         DEVMETHOD(clkdev_write_4,       aw_ccu_write_4),
  238         DEVMETHOD(clkdev_read_4,        aw_ccu_read_4),
  239         DEVMETHOD(clkdev_modify_4,      aw_ccu_modify_4),
  240         DEVMETHOD(clkdev_device_lock,   aw_ccu_device_lock),
  241         DEVMETHOD(clkdev_device_unlock, aw_ccu_device_unlock),
  242 
  243         DEVMETHOD_END
  244 };
  245 
  246 DEFINE_CLASS_1(aw_ccu, aw_ccu_driver, aw_ccu_methods,
  247     sizeof(struct aw_ccu_softc), simplebus_driver);
  248 
  249 static devclass_t aw_ccu_devclass;
  250 
  251 EARLY_DRIVER_MODULE(aw_ccu, simplebus, aw_ccu_driver, aw_ccu_devclass,
  252     0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
  253 
  254 MODULE_VERSION(aw_ccu, 1);

Cache object: 04ae7464ae0b68e0a2e8ad8b9d90fb68


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