ofw_iicbus.c

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    1 /*-
    2  * Copyright (c) 2009, Nathan Whitehorn <nwhitehorn@FreeBSD.org>
    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 unmodified, this list of conditions, and the following
   10  *    disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/bus.h>
   32 #include <sys/kernel.h>
   33 #include <sys/libkern.h>
   34 #include <sys/lock.h>
   35 #include <sys/module.h>
   36 #include <sys/mutex.h>
   37 
   38 #include <dev/iicbus/iicbus.h>
   39 #include <dev/iicbus/iiconf.h>
   40 #include <dev/ofw/ofw_bus.h>
   41 #include <dev/ofw/ofw_bus_subr.h>
   42 #include <dev/ofw/openfirm.h>
   43 
   44 #include "iicbus_if.h"
   45 #include "ofw_iicbus_if.h"
   46 
   47 /* Methods */
   48 static device_probe_t ofw_iicbus_probe;
   49 static device_attach_t ofw_iicbus_attach;
   50 static device_t ofw_iicbus_add_child(device_t dev, u_int order,
   51     const char *name, int unit);
   52 static const struct ofw_bus_devinfo *ofw_iicbus_get_devinfo(device_t bus,
   53     device_t dev);
   54 static int ofw_iicbus_set_devinfo(device_t bus, device_t dev,
   55     phandle_t ofw_node, char *ofw_name, char *ofw_compat, uint32_t i2c_addr);
   56 
   57 static device_method_t ofw_iicbus_methods[] = {
   58         /* Device interface */
   59         DEVMETHOD(device_probe,         ofw_iicbus_probe),
   60         DEVMETHOD(device_attach,        ofw_iicbus_attach),
   61 
   62         /* Bus interface */
   63         DEVMETHOD(bus_child_pnpinfo,    ofw_bus_gen_child_pnpinfo),
   64         DEVMETHOD(bus_add_child,        ofw_iicbus_add_child),
   65 
   66         /* ofw_bus interface */
   67         DEVMETHOD(ofw_bus_get_devinfo,  ofw_iicbus_get_devinfo),
   68         DEVMETHOD(ofw_bus_get_compat,   ofw_bus_gen_get_compat),
   69         DEVMETHOD(ofw_bus_get_model,    ofw_bus_gen_get_model),
   70         DEVMETHOD(ofw_bus_get_name,     ofw_bus_gen_get_name),
   71         DEVMETHOD(ofw_bus_get_node,     ofw_bus_gen_get_node),
   72         DEVMETHOD(ofw_bus_get_type,     ofw_bus_gen_get_type),
   73 
   74         /* ofw_iicbus interface */
   75         DEVMETHOD(ofw_iicbus_set_devinfo, ofw_iicbus_set_devinfo),
   76 
   77         DEVMETHOD_END
   78 };
   79 
   80 struct ofw_iicbus_devinfo {
   81         struct iicbus_ivar      opd_dinfo;      /* Must be the first. */
   82         struct ofw_bus_devinfo  opd_obdinfo;
   83 };
   84 
   85 DEFINE_CLASS_1(iicbus, ofw_iicbus_driver, ofw_iicbus_methods,
   86     sizeof(struct iicbus_softc), iicbus_driver);
   87 EARLY_DRIVER_MODULE(ofw_iicbus, iicbb, ofw_iicbus_driver, 0, 0, BUS_PASS_BUS);
   88 EARLY_DRIVER_MODULE(ofw_iicbus, iichb, ofw_iicbus_driver, 0, 0, BUS_PASS_BUS);
   89 EARLY_DRIVER_MODULE(ofw_iicbus, twsi, ofw_iicbus_driver, 0, 0, BUS_PASS_BUS);
   90 MODULE_VERSION(ofw_iicbus, 1);
   91 MODULE_DEPEND(ofw_iicbus, iicbus, 1, 1, 1);
   92 
   93 static int
   94 ofw_iicbus_probe(device_t dev)
   95 {
   96 
   97         if (ofw_bus_get_node(dev) == -1)
   98                 return (ENXIO);
   99         device_set_desc(dev, "OFW I2C bus");
  100 
  101         return (0);
  102 }
  103 
  104 static int
  105 ofw_iicbus_attach(device_t dev)
  106 {
  107         struct iicbus_softc *sc = IICBUS_SOFTC(dev);
  108         struct ofw_iicbus_devinfo *dinfo;
  109         phandle_t child, node, root;
  110         pcell_t freq, paddr;
  111         device_t childdev;
  112         ssize_t compatlen;
  113         char compat[255];
  114         char *curstr;
  115         u_int iic_addr_8bit = 0;
  116 
  117         sc->dev = dev;
  118         mtx_init(&sc->lock, "iicbus", NULL, MTX_DEF);
  119 
  120         /*
  121          * If there is a clock-frequency property for the device node, use it as
  122          * the starting value for the bus frequency.  Then call the common
  123          * routine that handles the tunable/sysctl which allows the FDT value to
  124          * be overridden by the user.
  125          */
  126         node = ofw_bus_get_node(dev);
  127         freq = 0;
  128         OF_getencprop(node, "clock-frequency", &freq, sizeof(freq));
  129         iicbus_init_frequency(dev, freq);
  130         
  131         iicbus_reset(dev, IIC_FASTEST, 0, NULL);
  132 
  133         bus_generic_probe(dev);
  134         bus_enumerate_hinted_children(dev);
  135 
  136         /*
  137          * Check if we're running on a PowerMac, needed for the I2C
  138          * address below.
  139          */
  140         root = OF_peer(0);
  141         compatlen = OF_getprop(root, "compatible", compat,
  142                                 sizeof(compat));
  143         if (compatlen != -1) {
  144             for (curstr = compat; curstr < compat + compatlen;
  145                 curstr += strlen(curstr) + 1) {
  146                 if (strncmp(curstr, "MacRISC", 7) == 0)
  147                     iic_addr_8bit = 1;
  148             }
  149         }
  150 
  151         /*
  152          * Attach those children represented in the device tree.
  153          */
  154         for (child = OF_child(node); child != 0; child = OF_peer(child)) {
  155                 /*
  156                  * Try to get the I2C address first from the i2c-address
  157                  * property, then try the reg property.  It moves around
  158                  * on different systems.
  159                  */
  160                 if (OF_getencprop(child, "i2c-address", &paddr,
  161                     sizeof(paddr)) == -1)
  162                         if (OF_getencprop(child, "reg", &paddr,
  163                             sizeof(paddr)) == -1)
  164                                 continue;
  165 
  166                 /*
  167                  * Now set up the I2C and OFW bus layer devinfo and add it
  168                  * to the bus.
  169                  */
  170                 dinfo = malloc(sizeof(struct ofw_iicbus_devinfo), M_DEVBUF,
  171                     M_NOWAIT | M_ZERO);
  172                 if (dinfo == NULL)
  173                         continue;
  174                 /*
  175                  * FreeBSD drivers expect I2C addresses to be expressed as
  176                  * 8-bit values.  Apple OFW data contains 8-bit values, but
  177                  * Linux FDT data contains 7-bit values, so shift them up to
  178                  * 8-bit format.
  179                  */
  180                 if (iic_addr_8bit)
  181                     dinfo->opd_dinfo.addr = paddr;
  182                 else
  183                     dinfo->opd_dinfo.addr = paddr << 1;
  184 
  185                 if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) !=
  186                     0) {
  187                         free(dinfo, M_DEVBUF);
  188                         continue;
  189                 }
  190 
  191                 childdev = device_add_child(dev, NULL, -1);
  192                 resource_list_init(&dinfo->opd_dinfo.rl);
  193                 ofw_bus_intr_to_rl(childdev, child,
  194                                         &dinfo->opd_dinfo.rl, NULL);
  195                 device_set_ivars(childdev, dinfo);
  196         }
  197 
  198         /* Register bus */
  199         OF_device_register_xref(OF_xref_from_node(node), dev);
  200         return (bus_generic_attach(dev));
  201 }
  202 
  203 static device_t
  204 ofw_iicbus_add_child(device_t dev, u_int order, const char *name, int unit)
  205 {
  206         device_t child;
  207         struct ofw_iicbus_devinfo *devi;
  208 
  209         child = device_add_child_ordered(dev, order, name, unit);
  210         if (child == NULL)
  211                 return (child);
  212         devi = malloc(sizeof(struct ofw_iicbus_devinfo), M_DEVBUF,
  213             M_NOWAIT | M_ZERO);
  214         if (devi == NULL) {
  215                 device_delete_child(dev, child);
  216                 return (0);
  217         }
  218 
  219         /*
  220          * NULL all the OFW-related parts of the ivars for non-OFW
  221          * children.
  222          */
  223         devi->opd_obdinfo.obd_node = -1;
  224         devi->opd_obdinfo.obd_name = NULL;
  225         devi->opd_obdinfo.obd_compat = NULL;
  226         devi->opd_obdinfo.obd_type = NULL;
  227         devi->opd_obdinfo.obd_model = NULL;
  228 
  229         device_set_ivars(child, devi);
  230 
  231         return (child);
  232 }
  233 
  234 static const struct ofw_bus_devinfo *
  235 ofw_iicbus_get_devinfo(device_t bus, device_t dev)
  236 {
  237         struct ofw_iicbus_devinfo *dinfo;
  238 
  239         dinfo = device_get_ivars(dev);
  240         return (&dinfo->opd_obdinfo);
  241 }
  242 
  243 static int
  244 ofw_iicbus_set_devinfo(device_t bus, device_t dev, phandle_t ofw_node,
  245     char *ofw_name, char *ofw_compat, uint32_t i2c_addr)
  246 {
  247         struct ofw_iicbus_devinfo *devi;
  248 
  249         /*
  250          * Setup OFW-related parts of the ivars for manually
  251          * created ofw_iicbus childern.
  252          */
  253         devi = device_get_ivars(dev);
  254         if (devi == NULL)
  255                 return (ENXIO);
  256 
  257         devi->opd_obdinfo.obd_node = ofw_node;
  258         if (ofw_name != NULL)
  259                 devi->opd_obdinfo.obd_name = strdup(ofw_name, M_OFWPROP);
  260         if (ofw_compat != NULL)
  261                 devi->opd_obdinfo.obd_compat = strdup(ofw_compat, M_OFWPROP);
  262         devi->opd_dinfo.addr = i2c_addr;
  263         return (0);
  264 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/iicbus/ofw_iicbus.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/iicbus/ofw_iicbus.c