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/xscale/ixp425/ixp425_iic.c

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    1 /*
    2  * Copyright (c) 2006 Kevin Lo. All rights reserved.
    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 WASABI SYSTEMS, INC. ``AS IS'' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   15  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
   17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   23  * POSSIBILITY OF SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/7.4/sys/arm/xscale/ixp425/ixp425_iic.c 180895 2008-07-28 16:05:48Z thompsa $");
   28 
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/kernel.h>
   32 #include <sys/module.h>
   33 #include <sys/bus.h>
   34 #include <sys/uio.h>
   35 
   36 #include <arm/xscale/ixp425/ixp425reg.h>
   37 #include <arm/xscale/ixp425/ixp425var.h>
   38 #include <arm/xscale/ixp425/ixdp425reg.h>
   39 
   40 #include <dev/iicbus/iiconf.h>
   41 #include <dev/iicbus/iicbus.h>
   42 
   43 #include "iicbb_if.h"
   44 
   45 #define I2C_DELAY       10
   46 
   47 /* bit clr/set shorthands */
   48 #define GPIO_CONF_CLR(sc, reg, mask)    \
   49         GPIO_CONF_WRITE_4(sc, reg, GPIO_CONF_READ_4(sc, reg) &~ (mask))
   50 #define GPIO_CONF_SET(sc, reg, mask)    \
   51         GPIO_CONF_WRITE_4(sc, reg, GPIO_CONF_READ_4(sc, reg) | (mask))
   52 
   53 struct ixpiic_softc {
   54         device_t                sc_dev;
   55         bus_space_tag_t         sc_iot;
   56         bus_space_handle_t      sc_gpio_ioh;
   57 
   58         device_t                iicbb;
   59 };
   60 
   61 static struct ixpiic_softc *ixpiic_sc = NULL;
   62 
   63 static int
   64 ixpiic_probe(device_t dev)
   65 {
   66         device_set_desc(dev, "IXP425 GPIO-Based I2C Interface");
   67         return (0);
   68 }
   69 
   70 static int
   71 ixpiic_attach(device_t dev)
   72 {
   73         struct ixpiic_softc *sc = device_get_softc(dev);
   74         struct ixp425_softc *sa = device_get_softc(device_get_parent(dev));
   75 
   76         ixpiic_sc = sc;
   77 
   78         sc->sc_dev = dev;
   79         sc->sc_iot = sa->sc_iot;
   80         sc->sc_gpio_ioh = sa->sc_gpio_ioh;
   81 
   82         GPIO_CONF_SET(sc, IXP425_GPIO_GPOER,
   83                 GPIO_I2C_SCL_BIT | GPIO_I2C_SDA_BIT);
   84         GPIO_CONF_CLR(sc, IXP425_GPIO_GPOUTR,
   85                 GPIO_I2C_SCL_BIT | GPIO_I2C_SDA_BIT);
   86 
   87         /* add generic bit-banging code */      
   88         if ((sc->iicbb = device_add_child(dev, "iicbb", -1)) == NULL)
   89                 device_printf(dev, "could not add iicbb\n");
   90 
   91         /* probe and attach the bit-banging code */
   92         device_probe_and_attach(sc->iicbb);
   93 
   94         return (0);
   95 }
   96 
   97 static int
   98 ixpiic_callback(device_t dev, int index, caddr_t *data)
   99 {
  100         return (0);
  101 }
  102 
  103 static int 
  104 ixpiic_getscl(device_t dev)
  105 {
  106         struct ixpiic_softc *sc = ixpiic_sc;
  107         uint32_t reg;
  108 
  109         GPIO_CONF_SET(sc, IXP425_GPIO_GPOER, GPIO_I2C_SCL_BIT);
  110 
  111         reg = GPIO_CONF_READ_4(sc, IXP425_GPIO_GPINR);
  112         return (reg & GPIO_I2C_SCL_BIT);
  113 }
  114 
  115 static int 
  116 ixpiic_getsda(device_t dev)
  117 {
  118         struct ixpiic_softc *sc = ixpiic_sc;
  119         uint32_t reg;
  120 
  121         GPIO_CONF_SET(sc, IXP425_GPIO_GPOER, GPIO_I2C_SDA_BIT);
  122 
  123         reg = GPIO_CONF_READ_4(sc, IXP425_GPIO_GPINR);
  124         return (reg & GPIO_I2C_SDA_BIT);
  125 }
  126 
  127 static void 
  128 ixpiic_setsda(device_t dev, char val)
  129 {
  130         struct ixpiic_softc *sc = ixpiic_sc;
  131 
  132         GPIO_CONF_CLR(sc, IXP425_GPIO_GPOUTR, GPIO_I2C_SDA_BIT);
  133         if (val)
  134                 GPIO_CONF_SET(sc, IXP425_GPIO_GPOER, GPIO_I2C_SDA_BIT);
  135         else
  136                 GPIO_CONF_CLR(sc, IXP425_GPIO_GPOER, GPIO_I2C_SDA_BIT);
  137         DELAY(I2C_DELAY);
  138 }
  139 
  140 static void 
  141 ixpiic_setscl(device_t dev, char val)
  142 {
  143         struct ixpiic_softc *sc = ixpiic_sc;
  144 
  145         GPIO_CONF_CLR(sc, IXP425_GPIO_GPOUTR, GPIO_I2C_SCL_BIT);
  146         if (val)
  147                 GPIO_CONF_SET(sc, IXP425_GPIO_GPOER, GPIO_I2C_SCL_BIT);
  148         else
  149                 GPIO_CONF_CLR(sc, IXP425_GPIO_GPOER, GPIO_I2C_SCL_BIT);
  150         DELAY(I2C_DELAY);
  151 }
  152 
  153 static int
  154 ixpiic_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
  155 {
  156         /* reset bus */
  157         ixpiic_setsda(dev, 1);
  158         ixpiic_setscl(dev, 1);
  159 
  160         return (IIC_ENOADDR);
  161 }
  162 
  163 static device_method_t ixpiic_methods[] = {
  164         /* device interface */
  165         DEVMETHOD(device_probe,         ixpiic_probe),
  166         DEVMETHOD(device_attach,        ixpiic_attach),
  167 
  168         /* iicbb interface */
  169         DEVMETHOD(iicbb_callback,       ixpiic_callback),
  170         DEVMETHOD(iicbb_setsda,         ixpiic_setsda),
  171         DEVMETHOD(iicbb_setscl,         ixpiic_setscl),
  172         DEVMETHOD(iicbb_getsda,         ixpiic_getsda),
  173         DEVMETHOD(iicbb_getscl,         ixpiic_getscl),
  174         DEVMETHOD(iicbb_reset,          ixpiic_reset),
  175 
  176         { 0, 0 }
  177 };
  178 
  179 static driver_t ixpiic_driver = {
  180         "ixpiic",
  181         ixpiic_methods,
  182         sizeof(struct ixpiic_softc),
  183 };
  184 static devclass_t ixpiic_devclass;
  185 
  186 DRIVER_MODULE(ixpiic, ixp, ixpiic_driver, ixpiic_devclass, 0, 0);

Cache object: a2fe22d92d35ffb1ff8c9d2d014183ea


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