vf_iomuxc.c

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    1 /*-
    2  * Copyright (c) 2013-2014 Ruslan Bukin <br@bsdpad.com>
    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 /*
   28  * Vybrid Family Input/Output Multiplexer Controller (IOMUXC)
   29  * Chapter 5, Vybrid Reference Manual, Rev. 5, 07/2013
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/11.0/sys/arm/freescale/vybrid/vf_iomuxc.c 281085 2015-04-04 21:34:26Z andrew $");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/bus.h>
   38 #include <sys/kernel.h>
   39 #include <sys/module.h>
   40 #include <sys/malloc.h>
   41 #include <sys/rman.h>
   42 #include <sys/timeet.h>
   43 #include <sys/timetc.h>
   44 #include <sys/watchdog.h>
   45 
   46 #include <dev/fdt/fdt_common.h>
   47 #include <dev/ofw/openfirm.h>
   48 #include <dev/ofw/ofw_bus.h>
   49 #include <dev/ofw/ofw_bus_subr.h>
   50 
   51 #include <machine/bus.h>
   52 #include <machine/cpu.h>
   53 #include <machine/intr.h>
   54 
   55 #include <arm/freescale/vybrid/vf_iomuxc.h>
   56 #include <arm/freescale/vybrid/vf_common.h>
   57 
   58 #define MUX_MODE_MASK           7
   59 #define MUX_MODE_SHIFT          20
   60 #define MUX_MODE_GPIO           0
   61 #define MUX_MODE_VBUS_EN_OTG    2
   62 
   63 #define IBE             (1 << 0)        /* Input Buffer Enable Field */
   64 #define OBE             (1 << 1)        /* Output Buffer Enable Field. */
   65 #define PUE             (1 << 2)        /* Pull / Keep Select Field. */
   66 #define PKE             (1 << 3)        /* Pull / Keep Enable Field. */
   67 #define HYS             (1 << 9)        /* Hysteresis Enable Field */
   68 #define ODE             (1 << 10)       /* Open Drain Enable Field. */
   69 #define SRE             (1 << 11)       /* Slew Rate Field. */
   70 
   71 #define SPEED_SHIFT             12
   72 #define SPEED_MASK              0x3
   73 #define SPEED_LOW               0       /* 50 MHz */
   74 #define SPEED_MEDIUM            0x1     /* 100 MHz */
   75 #define SPEED_HIGH              0x3     /* 200 MHz */
   76 
   77 #define PUS_SHIFT               4       /* Pull Up / Down Config Field Shift */
   78 #define PUS_MASK                0x3
   79 #define PUS_100_KOHM_PULL_DOWN  0
   80 #define PUS_47_KOHM_PULL_UP     0x1
   81 #define PUS_100_KOHM_PULL_UP    0x2
   82 #define PUS_22_KOHM_PULL_UP     0x3
   83 
   84 #define DSE_SHIFT               6       /* Drive Strength Field Shift */
   85 #define DSE_MASK                0x7
   86 #define DSE_DISABLED            0       /* Output driver disabled */
   87 #define DSE_150_OHM             0x1
   88 #define DSE_75_OHM              0x2
   89 #define DSE_50_OHM              0x3
   90 #define DSE_37_OHM              0x4
   91 #define DSE_30_OHM              0x5
   92 #define DSE_25_OHM              0x6
   93 #define DSE_20_OHM              0x7
   94 
   95 #define MAX_MUX_LEN             1024
   96 
   97 struct iomuxc_softc {
   98         struct resource         *tmr_res[1];
   99         bus_space_tag_t         bst;
  100         bus_space_handle_t      bsh;
  101         device_t                dev;
  102 };
  103 
  104 static struct resource_spec iomuxc_spec[] = {
  105         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
  106         { -1, 0 }
  107 };
  108 
  109 static int
  110 iomuxc_probe(device_t dev)
  111 {
  112 
  113         if (!ofw_bus_status_okay(dev))
  114                 return (ENXIO);
  115 
  116         if (!ofw_bus_is_compatible(dev, "fsl,mvf600-iomuxc"))
  117                 return (ENXIO);
  118 
  119         device_set_desc(dev, "Vybrid Family IOMUXC Unit");
  120         return (BUS_PROBE_DEFAULT);
  121 }
  122 
  123 static int
  124 pinmux_set(struct iomuxc_softc *sc)
  125 {
  126         phandle_t child, parent, root;
  127         pcell_t iomux_config[MAX_MUX_LEN];
  128         int len;
  129         int values;
  130         int pin;
  131         int pin_cfg;
  132         int i;
  133 
  134         root = OF_finddevice("/");
  135         len = 0;
  136         parent = root;
  137 
  138         /* Find 'iomux_config' prop in the nodes */
  139         for (child = OF_child(parent); child != 0; child = OF_peer(child)) {
  140 
  141                 /* Find a 'leaf'. Start the search from this node. */
  142                 while (OF_child(child)) {
  143                         parent = child;
  144                         child = OF_child(child);
  145                 }
  146 
  147                 if (!fdt_is_enabled(child))
  148                         continue;
  149 
  150                 if ((len = OF_getproplen(child, "iomux_config")) > 0) {
  151                         OF_getprop(child, "iomux_config", &iomux_config, len);
  152 
  153                         values = len / (sizeof(uint32_t));
  154                         for (i = 0; i < values; i += 2) {
  155                                 pin = fdt32_to_cpu(iomux_config[i]);
  156                                 pin_cfg = fdt32_to_cpu(iomux_config[i+1]);
  157 #if 0
  158                                 device_printf(sc->dev, "Set pin %d to 0x%08x\n",
  159                                     pin, pin_cfg);
  160 #endif
  161                                 WRITE4(sc, IOMUXC(pin), pin_cfg);
  162                         }
  163                 }
  164 
  165                 if (OF_peer(child) == 0) {
  166                         /* No more siblings. */
  167                         child = parent;
  168                         parent = OF_parent(child);
  169                 }
  170         }
  171 
  172         return (0);
  173 }
  174 
  175 static int
  176 iomuxc_attach(device_t dev)
  177 {
  178         struct iomuxc_softc *sc;
  179 
  180         sc = device_get_softc(dev);
  181         sc->dev = dev;
  182 
  183         if (bus_alloc_resources(dev, iomuxc_spec, sc->tmr_res)) {
  184                 device_printf(dev, "could not allocate resources\n");
  185                 return (ENXIO);
  186         }
  187 
  188         /* Memory interface */
  189         sc->bst = rman_get_bustag(sc->tmr_res[0]);
  190         sc->bsh = rman_get_bushandle(sc->tmr_res[0]);
  191 
  192         pinmux_set(sc);
  193 
  194         return (0);
  195 }
  196 
  197 static device_method_t iomuxc_methods[] = {
  198         DEVMETHOD(device_probe,         iomuxc_probe),
  199         DEVMETHOD(device_attach,        iomuxc_attach),
  200         { 0, 0 }
  201 };
  202 
  203 static driver_t iomuxc_driver = {
  204         "iomuxc",
  205         iomuxc_methods,
  206         sizeof(struct iomuxc_softc),
  207 };
  208 
  209 static devclass_t iomuxc_devclass;
  210 
  211 DRIVER_MODULE(iomuxc, simplebus, iomuxc_driver, iomuxc_devclass, 0, 0);

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sys/arm/freescale/vybrid/vf_iomuxc.c