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  * 3. All advertising materials mentioning features or use of this software
   13  *    must display the following acknowledgement:
   14  *      This product includes software developed for the NetBSD Project by
   15  *      Wasabi Systems, Inc.
   16  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
   17  *    or promote products derived from this software without specific prior
   18  *    written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
   24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   30  * POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/kernel.h>
   39 #include <sys/module.h>
   40 #include <sys/bus.h>
   41 #include <sys/uio.h>
   42 
   43 #include <arm/xscale/ixp425/ixp425reg.h>
   44 #include <arm/xscale/ixp425/ixp425var.h>
   45 #include <arm/xscale/ixp425/ixdp425reg.h>
   46 
   47 #include <dev/iicbus/iiconf.h>
   48 #include <dev/iicbus/iicbus.h>
   49 
   50 #include "iicbb_if.h"
   51 
   52 #define I2C_DELAY       10
   53 
   54 /* bit clr/set shorthands */
   55 #define GPIO_CONF_CLR(sc, reg, mask)    \
   56         GPIO_CONF_WRITE_4(sc, reg, GPIO_CONF_READ_4(sc, reg) &~ (mask))
   57 #define GPIO_CONF_SET(sc, reg, mask)    \
   58         GPIO_CONF_WRITE_4(sc, reg, GPIO_CONF_READ_4(sc, reg) | (mask))
   59 
   60 struct ixpiic_softc {
   61         device_t                sc_dev;
   62         bus_space_tag_t         sc_iot;
   63         bus_space_handle_t      sc_gpio_ioh;
   64 
   65         device_t                iicbb;
   66 };
   67 
   68 static struct ixpiic_softc *ixpiic_sc = NULL;
   69 
   70 static int
   71 ixpiic_probe(device_t dev)
   72 {
   73         device_set_desc(dev, "IXP425 GPIO-Based I2C Interface");
   74         return (0);
   75 }
   76 
   77 static int
   78 ixpiic_attach(device_t dev)
   79 {
   80         struct ixpiic_softc *sc = device_get_softc(dev);
   81         struct ixp425_softc *sa = device_get_softc(device_get_parent(dev));
   82 
   83         ixpiic_sc = sc;
   84 
   85         sc->sc_dev = dev;
   86         sc->sc_iot = sa->sc_iot;
   87         sc->sc_gpio_ioh = sa->sc_gpio_ioh;
   88 
   89         GPIO_CONF_SET(sc, IXP425_GPIO_GPOER,
   90                 GPIO_I2C_SCL_BIT | GPIO_I2C_SDA_BIT);
   91         GPIO_CONF_CLR(sc, IXP425_GPIO_GPOUTR,
   92                 GPIO_I2C_SCL_BIT | GPIO_I2C_SDA_BIT);
   93 
   94         /* add generic bit-banging code */      
   95         if ((sc->iicbb = device_add_child(dev, "iicbb", -1)) == NULL)
   96                 device_printf(dev, "could not add iicbb\n");
   97 
   98         /* probe and attach the bit-banging code */
   99         device_probe_and_attach(sc->iicbb);
  100 
  101         return (0);
  102 }
  103 
  104 static int
  105 ixpiic_callback(device_t dev, int index, caddr_t *data)
  106 {
  107         return (0);
  108 }
  109 
  110 static int 
  111 ixpiic_getscl(device_t dev)
  112 {
  113         struct ixpiic_softc *sc = ixpiic_sc;
  114         uint32_t reg;
  115 
  116         GPIO_CONF_SET(sc, IXP425_GPIO_GPOER, GPIO_I2C_SCL_BIT);
  117 
  118         reg = GPIO_CONF_READ_4(sc, IXP425_GPIO_GPINR);
  119         return (reg & GPIO_I2C_SCL_BIT);
  120 }
  121 
  122 static int 
  123 ixpiic_getsda(device_t dev)
  124 {
  125         struct ixpiic_softc *sc = ixpiic_sc;
  126         uint32_t reg;
  127 
  128         GPIO_CONF_SET(sc, IXP425_GPIO_GPOER, GPIO_I2C_SDA_BIT);
  129 
  130         reg = GPIO_CONF_READ_4(sc, IXP425_GPIO_GPINR);
  131         return (reg & GPIO_I2C_SDA_BIT);
  132 }
  133 
  134 static void 
  135 ixpiic_setsda(device_t dev, char val)
  136 {
  137         struct ixpiic_softc *sc = ixpiic_sc;
  138 
  139         GPIO_CONF_CLR(sc, IXP425_GPIO_GPOUTR, GPIO_I2C_SDA_BIT);
  140         if (val)
  141                 GPIO_CONF_SET(sc, IXP425_GPIO_GPOER, GPIO_I2C_SDA_BIT);
  142         else
  143                 GPIO_CONF_CLR(sc, IXP425_GPIO_GPOER, GPIO_I2C_SDA_BIT);
  144         DELAY(I2C_DELAY);
  145 }
  146 
  147 static void 
  148 ixpiic_setscl(device_t dev, char val)
  149 {
  150         struct ixpiic_softc *sc = ixpiic_sc;
  151 
  152         GPIO_CONF_CLR(sc, IXP425_GPIO_GPOUTR, GPIO_I2C_SCL_BIT);
  153         if (val)
  154                 GPIO_CONF_SET(sc, IXP425_GPIO_GPOER, GPIO_I2C_SCL_BIT);
  155         else
  156                 GPIO_CONF_CLR(sc, IXP425_GPIO_GPOER, GPIO_I2C_SCL_BIT);
  157         DELAY(I2C_DELAY);
  158 }
  159 
  160 static int
  161 ixpiic_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
  162 {
  163         /* reset bus */
  164         ixpiic_setsda(dev, 1);
  165         ixpiic_setscl(dev, 1);
  166 
  167         return (IIC_ENOADDR);
  168 }
  169 
  170 static device_method_t ixpiic_methods[] = {
  171         /* device interface */
  172         DEVMETHOD(device_probe,         ixpiic_probe),
  173         DEVMETHOD(device_attach,        ixpiic_attach),
  174 
  175         /* iicbb interface */
  176         DEVMETHOD(iicbb_callback,       ixpiic_callback),
  177         DEVMETHOD(iicbb_setsda,         ixpiic_setsda),
  178         DEVMETHOD(iicbb_setscl,         ixpiic_setscl),
  179         DEVMETHOD(iicbb_getsda,         ixpiic_getsda),
  180         DEVMETHOD(iicbb_getscl,         ixpiic_getscl),
  181         DEVMETHOD(iicbb_reset,          ixpiic_reset),
  182 
  183         { 0, 0 }
  184 };
  185 
  186 static driver_t ixpiic_driver = {
  187         "ixpiic",
  188         ixpiic_methods,
  189         sizeof(struct ixpiic_softc),
  190 };
  191 static devclass_t ixpiic_devclass;
  192 
  193 DRIVER_MODULE(ixpiic, ixp, ixpiic_driver, ixpiic_devclass, 0, 0);

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