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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * Copyright (c) 2016 Emmanuel Vadot <manu@freebsd.org>
    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 AND CONTRIBUTORS ``AS IS'' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, 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 
   26 /*
   27  * Allwinner Touch Sreen driver
   28  * Touch screen part is not done, only the thermal sensor part is.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/bus.h>
   37 #include <sys/kernel.h>
   38 #include <sys/module.h>
   39 #include <sys/rman.h>
   40 #include <sys/sysctl.h>
   41 #include <machine/bus.h>
   42 
   43 #include <dev/ofw/openfirm.h>
   44 #include <dev/ofw/ofw_bus.h>
   45 #include <dev/ofw/ofw_bus_subr.h>
   46 
   47 #define READ(_sc, _r) bus_read_4((_sc)->res[0], (_r))
   48 #define WRITE(_sc, _r, _v) bus_write_4((_sc)->res[0], (_r), (_v))
   49 
   50 /* Control register 0 */
   51 #define TP_CTRL0        0x00
   52 #define  TP_CTRL0_TACQ(x)       ((x & 0xFF) << 0)
   53 #define  TP_CTRL0_FS_DIV(x)     ((x & 0xF) << 16)
   54 #define  TP_CTRL0_CLK_DIV(x)    ((x & 0x3) << 20)
   55 #define  TP_CTRL0_CLK_SELECT(x) ((x & 0x1) << 22)
   56 
   57 /* Control register 1 */
   58 #define TP_CTRL1        0x04
   59 #define  TP_CTRL1_MODE_EN       (1 << 4)
   60 
   61 /* Control register 2 */
   62 #define TP_CTRL2        0x08
   63 
   64 /* Control register 3 */
   65 #define TP_CTRL3        0x0C
   66 
   67 /* Int/FIFO control register */
   68 #define TP_FIFOC        0x10
   69 #define  TP_FIFOC_TEMP_IRQ_ENABLE       (1 << 18)
   70 
   71 /* Int/FIFO status register */
   72 #define TP_FIFOS        0x14
   73 #define  TP_FIFOS_TEMP_IRQ_PENDING      (1 << 18)
   74 
   75 /* Temperature Period Register */
   76 #define TP_TPR          0x18
   77 #define  TP_TPR_TEMP_EN         (1 << 16)
   78 #define  TP_TPR_TEMP_PERIOD(x)  (x << 0)
   79 
   80 /* Common data register */
   81 #define TP_CDAT         0x1C
   82 
   83 /* Temperature data register */
   84 #define TEMP_DATA       0x20
   85 
   86 /* TP Data register*/
   87 #define TP_DATA         0x24
   88 
   89 /* TP IO config register */
   90 #define TP_IO_CONFIG    0x28
   91 
   92 /* TP IO port data register */
   93 #define TP_IO_DATA      0x2C
   94 
   95 struct aw_ts_softc {
   96         device_t                dev;
   97         struct resource *       res[2];
   98         void *                  intrhand;
   99         int                     temp_data;
  100         int                     temp_offset;
  101         int                     temp_step;
  102 };
  103 
  104 static struct resource_spec aw_ts_spec[] = {
  105         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
  106         { SYS_RES_IRQ,          0,      RF_ACTIVE | RF_SHAREABLE },
  107         { -1, 0 }
  108 };
  109 
  110 #define A10_TS  1
  111 #define A13_TS  2
  112 
  113 #define AW_TS_TEMP_SYSCTL       1
  114 
  115 static struct ofw_compat_data compat_data[] = {
  116         {"allwinner,sun4i-a10-ts", A10_TS},
  117         {"allwinner,sun5i-a13-ts", A13_TS},
  118         {NULL,             0}
  119 };
  120 
  121 static void
  122 aw_ts_intr(void *arg)
  123 {
  124         struct aw_ts_softc *sc;
  125         int val;
  126 
  127         sc= (struct aw_ts_softc *)arg;
  128 
  129         val = READ(sc, TP_FIFOS);
  130         if (val & TP_FIFOS_TEMP_IRQ_PENDING) {
  131                 /* Convert the value to millicelsius then millikelvin */
  132                 sc->temp_data = (READ(sc, TEMP_DATA) * sc->temp_step - sc->temp_offset)
  133                         + 273150;
  134         }
  135 
  136         WRITE(sc, TP_FIFOS, val);
  137 }
  138 
  139 static int
  140 aw_ts_probe(device_t dev)
  141 {
  142 
  143         if (!ofw_bus_status_okay(dev))
  144                 return (ENXIO);
  145 
  146         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
  147                 return (ENXIO);
  148 
  149         device_set_desc(dev, "Allwinner Touch Screen controller");
  150         return (BUS_PROBE_DEFAULT);
  151 }
  152 
  153 static int
  154 aw_ts_attach(device_t dev)
  155 {
  156         struct aw_ts_softc *sc;
  157 
  158         sc = device_get_softc(dev);
  159         sc->dev = dev;
  160 
  161         if (bus_alloc_resources(dev, aw_ts_spec, sc->res) != 0) {
  162                 device_printf(dev, "could not allocate memory resource\n");
  163                 return (ENXIO);
  164         }
  165 
  166         if (bus_setup_intr(dev, sc->res[1],
  167             INTR_TYPE_MISC | INTR_MPSAFE, NULL, aw_ts_intr, sc,
  168             &sc->intrhand)) {
  169                 bus_release_resources(dev, aw_ts_spec, sc->res);
  170                 device_printf(dev, "cannot setup interrupt handler\n");
  171                 return (ENXIO);
  172         }
  173 
  174         /*
  175          * Thoses magic values were taken from linux which take them from
  176          * the allwinner SDK or found them by deduction
  177          */
  178         switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
  179         case A10_TS:
  180                 sc->temp_offset = 257000;
  181                 sc->temp_step = 133;
  182                 break;
  183         case A13_TS:
  184                 sc->temp_offset = 144700;
  185                 sc->temp_step = 100;
  186                 break;
  187         }
  188 
  189         /* Enable clock and set divisers */
  190         WRITE(sc, TP_CTRL0, TP_CTRL0_CLK_SELECT(0) |
  191           TP_CTRL0_CLK_DIV(2) |
  192           TP_CTRL0_FS_DIV(7) |
  193           TP_CTRL0_TACQ(63));
  194 
  195         /* Enable TS module */
  196         WRITE(sc, TP_CTRL1, TP_CTRL1_MODE_EN);
  197 
  198         /* Enable Temperature, period is ~2s */
  199         WRITE(sc, TP_TPR, TP_TPR_TEMP_EN | TP_TPR_TEMP_PERIOD(1953));
  200 
  201         /* Enable temp irq */
  202         WRITE(sc, TP_FIFOC, TP_FIFOC_TEMP_IRQ_ENABLE);
  203 
  204         /* Add sysctl */
  205         SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
  206             SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
  207             OID_AUTO, "temperature",
  208             CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
  209             &sc->temp_data, 0, sysctl_handle_int,
  210             "IK3", "CPU Temperature");
  211 
  212         return (0);
  213 }
  214 
  215 static device_method_t aw_ts_methods[] = {
  216         DEVMETHOD(device_probe, aw_ts_probe),
  217         DEVMETHOD(device_attach, aw_ts_attach),
  218 
  219         DEVMETHOD_END
  220 };
  221 
  222 static driver_t aw_ts_driver = {
  223         "aw_ts",
  224         aw_ts_methods,
  225         sizeof(struct aw_ts_softc),
  226 };
  227 static devclass_t aw_ts_devclass;
  228 
  229 DRIVER_MODULE(aw_ts, simplebus, aw_ts_driver, aw_ts_devclass, 0, 0);

Cache object: f285008bf363ba0e9d25a406c4f59ff0


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.