237 lines
6.8 KiB
C
237 lines
6.8 KiB
C
/*-
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* Copyright (c) 2009, Nathan Whitehorn <nwhitehorn@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/libkern.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/ofw/openfirm.h>
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#include "iicbus_if.h"
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/* Methods */
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static device_probe_t ofw_iicbus_probe;
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static device_attach_t ofw_iicbus_attach;
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static device_t ofw_iicbus_add_child(device_t dev, u_int order,
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const char *name, int unit);
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static const struct ofw_bus_devinfo *ofw_iicbus_get_devinfo(device_t bus,
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device_t dev);
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static device_method_t ofw_iicbus_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, ofw_iicbus_probe),
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DEVMETHOD(device_attach, ofw_iicbus_attach),
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/* Bus interface */
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DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
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DEVMETHOD(bus_add_child, ofw_iicbus_add_child),
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/* ofw_bus interface */
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DEVMETHOD(ofw_bus_get_devinfo, ofw_iicbus_get_devinfo),
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DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
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DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
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DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
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DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
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DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
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DEVMETHOD_END
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};
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struct ofw_iicbus_devinfo {
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struct iicbus_ivar opd_dinfo; /* Must be the first. */
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struct ofw_bus_devinfo opd_obdinfo;
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};
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static devclass_t ofwiicbus_devclass;
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DEFINE_CLASS_1(iicbus, ofw_iicbus_driver, ofw_iicbus_methods,
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sizeof(struct iicbus_softc), iicbus_driver);
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DRIVER_MODULE(ofw_iicbus, iicbb, ofw_iicbus_driver, ofwiicbus_devclass, 0, 0);
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DRIVER_MODULE(ofw_iicbus, iichb, ofw_iicbus_driver, ofwiicbus_devclass, 0, 0);
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MODULE_VERSION(ofw_iicbus, 1);
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MODULE_DEPEND(ofw_iicbus, iicbus, 1, 1, 1);
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static int
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ofw_iicbus_probe(device_t dev)
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{
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if (ofw_bus_get_node(dev) == -1)
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return (ENXIO);
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device_set_desc(dev, "OFW I2C bus");
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return (0);
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}
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static int
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ofw_iicbus_attach(device_t dev)
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{
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struct iicbus_softc *sc = IICBUS_SOFTC(dev);
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struct ofw_iicbus_devinfo *dinfo;
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phandle_t child, node, root;
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pcell_t freq, paddr;
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device_t childdev;
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ssize_t compatlen;
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char compat[255];
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char *curstr;
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u_int iic_addr_8bit = 0;
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sc->dev = dev;
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mtx_init(&sc->lock, "iicbus", NULL, MTX_DEF);
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/*
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* If there is a clock-frequency property for the device node, use it as
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* the starting value for the bus frequency. Then call the common
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* routine that handles the tunable/sysctl which allows the FDT value to
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* be overridden by the user.
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*/
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node = ofw_bus_get_node(dev);
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freq = 0;
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OF_getencprop(node, "clock-frequency", &freq, sizeof(freq));
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iicbus_init_frequency(dev, freq);
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iicbus_reset(dev, IIC_FASTEST, 0, NULL);
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bus_generic_probe(dev);
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bus_enumerate_hinted_children(dev);
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/*
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* Check if we're running on a PowerMac, needed for the I2C
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* address below.
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*/
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root = OF_peer(0);
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compatlen = OF_getprop(root, "compatible", compat,
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sizeof(compat));
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if (compatlen != -1) {
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for (curstr = compat; curstr < compat + compatlen;
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curstr += strlen(curstr) + 1) {
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if (strncmp(curstr, "MacRISC", 7) == 0)
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iic_addr_8bit = 1;
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}
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}
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/*
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* Attach those children represented in the device tree.
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*/
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for (child = OF_child(node); child != 0; child = OF_peer(child)) {
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/*
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* Try to get the I2C address first from the i2c-address
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* property, then try the reg property. It moves around
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* on different systems.
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*/
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if (OF_getencprop(child, "i2c-address", &paddr,
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sizeof(paddr)) == -1)
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if (OF_getencprop(child, "reg", &paddr,
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sizeof(paddr)) == -1)
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continue;
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/*
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* Now set up the I2C and OFW bus layer devinfo and add it
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* to the bus.
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*/
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dinfo = malloc(sizeof(struct ofw_iicbus_devinfo), M_DEVBUF,
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M_NOWAIT | M_ZERO);
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if (dinfo == NULL)
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continue;
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/*
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* FreeBSD drivers expect I2C addresses to be expressed as
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* 8-bit values. Apple OFW data contains 8-bit values, but
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* Linux FDT data contains 7-bit values, so shift them up to
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* 8-bit format.
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*/
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if (iic_addr_8bit)
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dinfo->opd_dinfo.addr = paddr;
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else
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dinfo->opd_dinfo.addr = paddr << 1;
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if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) !=
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0) {
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free(dinfo, M_DEVBUF);
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continue;
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}
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childdev = device_add_child(dev, NULL, -1);
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resource_list_init(&dinfo->opd_dinfo.rl);
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ofw_bus_intr_to_rl(childdev, child,
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&dinfo->opd_dinfo.rl, NULL);
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device_set_ivars(childdev, dinfo);
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}
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/* Register bus */
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OF_device_register_xref(OF_xref_from_node(node), dev);
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return (bus_generic_attach(dev));
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}
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static device_t
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ofw_iicbus_add_child(device_t dev, u_int order, const char *name, int unit)
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{
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device_t child;
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struct ofw_iicbus_devinfo *devi;
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child = device_add_child_ordered(dev, order, name, unit);
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if (child == NULL)
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return (child);
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devi = malloc(sizeof(struct ofw_iicbus_devinfo), M_DEVBUF,
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M_NOWAIT | M_ZERO);
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if (devi == NULL) {
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device_delete_child(dev, child);
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return (0);
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}
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/*
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* NULL all the OFW-related parts of the ivars for non-OFW
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* children.
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*/
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devi->opd_obdinfo.obd_node = -1;
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devi->opd_obdinfo.obd_name = NULL;
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devi->opd_obdinfo.obd_compat = NULL;
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devi->opd_obdinfo.obd_type = NULL;
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devi->opd_obdinfo.obd_model = NULL;
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device_set_ivars(child, devi);
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return (child);
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}
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static const struct ofw_bus_devinfo *
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ofw_iicbus_get_devinfo(device_t bus, device_t dev)
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{
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struct ofw_iicbus_devinfo *dinfo;
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dinfo = device_get_ivars(dev);
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return (&dinfo->opd_obdinfo);
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}
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