vf_iomuxc.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2013-2014 Ruslan Bukin <br@bsdpad.com>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 /*
   30  * Vybrid Family Input/Output Multiplexer Controller (IOMUXC)
   31  * Chapter 5, Vybrid Reference Manual, Rev. 5, 07/2013
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD$");
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/bus.h>
   40 #include <sys/kernel.h>
   41 #include <sys/module.h>
   42 #include <sys/malloc.h>
   43 #include <sys/rman.h>
   44 #include <sys/timeet.h>
   45 #include <sys/timetc.h>
   46 #include <sys/watchdog.h>
   47 
   48 #include <dev/fdt/fdt_common.h>
   49 #include <dev/ofw/openfirm.h>
   50 #include <dev/ofw/ofw_bus.h>
   51 #include <dev/ofw/ofw_bus_subr.h>
   52 
   53 #include <machine/bus.h>
   54 #include <machine/cpu.h>
   55 #include <machine/intr.h>
   56 
   57 #include <arm/freescale/vybrid/vf_iomuxc.h>
   58 #include <arm/freescale/vybrid/vf_common.h>
   59 
   60 #define MUX_MODE_MASK           7
   61 #define MUX_MODE_SHIFT          20
   62 #define MUX_MODE_GPIO           0
   63 #define MUX_MODE_VBUS_EN_OTG    2
   64 
   65 #define IBE             (1 << 0)        /* Input Buffer Enable Field */
   66 #define OBE             (1 << 1)        /* Output Buffer Enable Field. */
   67 #define PUE             (1 << 2)        /* Pull / Keep Select Field. */
   68 #define PKE             (1 << 3)        /* Pull / Keep Enable Field. */
   69 #define HYS             (1 << 9)        /* Hysteresis Enable Field */
   70 #define ODE             (1 << 10)       /* Open Drain Enable Field. */
   71 #define SRE             (1 << 11)       /* Slew Rate Field. */
   72 
   73 #define SPEED_SHIFT             12
   74 #define SPEED_MASK              0x3
   75 #define SPEED_LOW               0       /* 50 MHz */
   76 #define SPEED_MEDIUM            0x1     /* 100 MHz */
   77 #define SPEED_HIGH              0x3     /* 200 MHz */
   78 
   79 #define PUS_SHIFT               4       /* Pull Up / Down Config Field Shift */
   80 #define PUS_MASK                0x3
   81 #define PUS_100_KOHM_PULL_DOWN  0
   82 #define PUS_47_KOHM_PULL_UP     0x1
   83 #define PUS_100_KOHM_PULL_UP    0x2
   84 #define PUS_22_KOHM_PULL_UP     0x3
   85 
   86 #define DSE_SHIFT               6       /* Drive Strength Field Shift */
   87 #define DSE_MASK                0x7
   88 #define DSE_DISABLED            0       /* Output driver disabled */
   89 #define DSE_150_OHM             0x1
   90 #define DSE_75_OHM              0x2
   91 #define DSE_50_OHM              0x3
   92 #define DSE_37_OHM              0x4
   93 #define DSE_30_OHM              0x5
   94 #define DSE_25_OHM              0x6
   95 #define DSE_20_OHM              0x7
   96 
   97 #define MAX_MUX_LEN             1024
   98 
   99 struct iomuxc_softc {
  100         struct resource         *tmr_res[1];
  101         bus_space_tag_t         bst;
  102         bus_space_handle_t      bsh;
  103         device_t                dev;
  104 };
  105 
  106 static struct resource_spec iomuxc_spec[] = {
  107         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
  108         { -1, 0 }
  109 };
  110 
  111 static int
  112 iomuxc_probe(device_t dev)
  113 {
  114 
  115         if (!ofw_bus_status_okay(dev))
  116                 return (ENXIO);
  117 
  118         if (!ofw_bus_is_compatible(dev, "fsl,mvf600-iomuxc"))
  119                 return (ENXIO);
  120 
  121         device_set_desc(dev, "Vybrid Family IOMUXC Unit");
  122         return (BUS_PROBE_DEFAULT);
  123 }
  124 
  125 static int
  126 pinmux_set(struct iomuxc_softc *sc)
  127 {
  128         phandle_t child, parent, root;
  129         pcell_t iomux_config[MAX_MUX_LEN];
  130         int len;
  131         int values;
  132         int pin;
  133         int pin_cfg;
  134         int i;
  135 
  136         root = OF_finddevice("/");
  137         len = 0;
  138         parent = root;
  139 
  140         /* Find 'iomux_config' prop in the nodes */
  141         for (child = OF_child(parent); child != 0; child = OF_peer(child)) {
  142                 /* Find a 'leaf'. Start the search from this node. */
  143                 while (OF_child(child)) {
  144                         parent = child;
  145                         child = OF_child(child);
  146                 }
  147 
  148                 if (!ofw_bus_node_status_okay(child))
  149                         continue;
  150 
  151                 if ((len = OF_getproplen(child, "iomux_config")) > 0) {
  152                         OF_getencprop(child, "iomux_config", iomux_config, len);
  153 
  154                         values = len / (sizeof(uint32_t));
  155                         for (i = 0; i < values; i += 2) {
  156                                 pin = iomux_config[i];
  157                                 pin_cfg = iomux_config[i+1];
  158 #if 0
  159                                 device_printf(sc->dev, "Set pin %d to 0x%08x\n",
  160                                     pin, pin_cfg);
  161 #endif
  162                                 WRITE4(sc, IOMUXC(pin), pin_cfg);
  163                         }
  164                 }
  165 
  166                 if (OF_peer(child) == 0) {
  167                         /* No more siblings. */
  168                         child = parent;
  169                         parent = OF_parent(child);
  170                 }
  171         }
  172 
  173         return (0);
  174 }
  175 
  176 static int
  177 iomuxc_attach(device_t dev)
  178 {
  179         struct iomuxc_softc *sc;
  180 
  181         sc = device_get_softc(dev);
  182         sc->dev = dev;
  183 
  184         if (bus_alloc_resources(dev, iomuxc_spec, sc->tmr_res)) {
  185                 device_printf(dev, "could not allocate resources\n");
  186                 return (ENXIO);
  187         }
  188 
  189         /* Memory interface */
  190         sc->bst = rman_get_bustag(sc->tmr_res[0]);
  191         sc->bsh = rman_get_bushandle(sc->tmr_res[0]);
  192 
  193         pinmux_set(sc);
  194 
  195         return (0);
  196 }
  197 
  198 static device_method_t iomuxc_methods[] = {
  199         DEVMETHOD(device_probe,         iomuxc_probe),
  200         DEVMETHOD(device_attach,        iomuxc_attach),
  201         { 0, 0 }
  202 };
  203 
  204 static driver_t iomuxc_driver = {
  205         "iomuxc",
  206         iomuxc_methods,
  207         sizeof(struct iomuxc_softc),
  208 };
  209 
  210 DRIVER_MODULE(iomuxc, simplebus, iomuxc_driver, 0, 0);

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sys/arm/freescale/vybrid/vf_iomuxc.c