svn commit: r355924 - in head/sys: conf dev/iicbus
Philip Paeps
philip at FreeBSD.org
Fri Dec 20 03:40:51 UTC 2019
Author: philip
Date: Fri Dec 20 03:40:50 2019
New Revision: 355924
URL: https://svnweb.freebsd.org/changeset/base/355924
Log:
iicoc: add FDT bus attachment
This adds support for OpenCores I2C master controllers on FDT systems.
Reviewed by: kp
Sponsored by: Axiado
Added:
head/sys/dev/iicbus/iicoc_fdt.c (contents, props changed)
Modified:
head/sys/conf/files
Modified: head/sys/conf/files
==============================================================================
--- head/sys/conf/files Fri Dec 20 03:40:46 2019 (r355923)
+++ head/sys/conf/files Fri Dec 20 03:40:50 2019 (r355924)
@@ -1797,6 +1797,7 @@ dev/iicbus/iiconf.c optional iicbus
dev/iicbus/iicsmb.c optional iicsmb \
dependency "iicbus_if.h"
dev/iicbus/iicoc.c optional iicoc
+dev/iicbus/iicoc_fdt.c optional iicoc fdt
dev/iicbus/iicoc_pci.c optional iicoc pci
dev/iicbus/isl12xx.c optional isl12xx
dev/iicbus/lm75.c optional lm75
Added: head/sys/dev/iicbus/iicoc_fdt.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/dev/iicbus/iicoc_fdt.c Fri Dec 20 03:40:50 2019 (r355924)
@@ -0,0 +1,188 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2019 Axiado Corporation.
+ * All rights reserved.
+ *
+ * This software was developed in part by Philip Paeps under contract for
+ * Axiado Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/limits.h>
+#include <sys/module.h>
+#include <sys/bus.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/rman.h>
+
+#include <dev/extres/clk/clk.h>
+
+#include <dev/iicbus/iicbus.h>
+#include <dev/iicbus/iiconf.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include "iicbus_if.h"
+#include "iicoc.h"
+
+static struct ofw_compat_data compat_data[] = {
+ { "opencores,i2c-ocores", 1 },
+ { NULL, 0 }
+};
+
+static struct resource_spec iicoc_spec[] = {
+ { SYS_RES_MEMORY, 0, RF_ACTIVE },
+ RESOURCE_SPEC_END
+};
+
+static phandle_t
+iicoc_get_node(device_t bus, device_t dev)
+{
+
+ /* Share controller node with iicbus device. */
+ return (ofw_bus_get_node(bus));
+}
+
+static int
+iicoc_attach(device_t dev)
+{
+ struct iicoc_softc *sc;
+ phandle_t node;
+ clk_t clock;
+ uint64_t clockfreq;
+ int error;
+
+ sc = device_get_softc(dev);
+ sc->dev = dev;
+
+ mtx_init(&sc->sc_mtx, "iicoc", "iicoc", MTX_DEF);
+
+ error = bus_alloc_resources(dev, iicoc_spec, &sc->mem_res);
+ if (error) {
+ device_printf(dev, "Could not allocate bus resource.\n");
+ goto fail;
+ }
+
+ node = ofw_bus_get_node(dev);
+ sc->reg_shift = 0;
+ OF_getencprop(node, "reg-shift", &sc->reg_shift,
+ sizeof(sc->reg_shift));
+
+ error = clk_get_by_ofw_index(dev, 0, 0, &clock);
+ if (error) {
+ device_printf(dev, "Couldn't get clock\n");
+ goto fail;
+ }
+ error = clk_enable(clock);
+ if (error) {
+ device_printf(dev, "Couldn't enable clock\n");
+ goto fail1;
+ }
+ error = clk_get_freq(clock, &clockfreq);
+ if (error) {
+ device_printf(dev, "Couldn't get clock frequency\n");
+ goto fail1;
+ }
+ if (clockfreq > UINT_MAX) {
+ device_printf(dev, "Unsupported clock frequency\n");
+ goto fail1;
+ }
+ sc->clockfreq = (u_int)clockfreq;
+ sc->i2cfreq = XLP_I2C_FREQ;
+ iicoc_init(dev);
+
+ sc->iicbus = device_add_child(dev, "iicbus", -1);
+ if (sc->iicbus == NULL) {
+ device_printf(dev, "Could not allocate iicbus instance.\n");
+ error = ENXIO;
+ goto fail1;
+ }
+
+ /* Probe and attach the iicbus when interrupts are available. */
+ config_intrhook_oneshot((ich_func_t)bus_generic_attach, dev);
+
+ return (0);
+
+fail1:
+ clk_disable(clock);
+
+fail:
+ bus_release_resources(dev, iicoc_spec, &sc->mem_res);
+ mtx_destroy(&sc->sc_mtx);
+ return (error);
+}
+
+static int
+iicoc_probe(device_t dev)
+{
+
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
+ return (ENXIO);
+
+ device_set_desc(dev, "OpenCores I2C master controller");
+
+ return (BUS_PROBE_DEFAULT);
+}
+
+static device_method_t iicoc_methods[] = {
+ /* device interface */
+ DEVMETHOD(device_probe, iicoc_probe),
+ DEVMETHOD(device_attach, iicoc_attach),
+
+ /* ofw interface */
+ DEVMETHOD(ofw_bus_get_node, iicoc_get_node),
+
+ /* iicbus interface */
+ DEVMETHOD(iicbus_callback, iicbus_null_callback),
+ DEVMETHOD(iicbus_repeated_start, iicoc_iicbus_repeated_start),
+ DEVMETHOD(iicbus_start, iicoc_iicbus_start),
+ DEVMETHOD(iicbus_stop, iicoc_iicbus_stop),
+ DEVMETHOD(iicbus_reset, iicoc_iicbus_reset),
+ DEVMETHOD(iicbus_write, iicoc_iicbus_write),
+ DEVMETHOD(iicbus_read, iicoc_iicbus_read),
+ DEVMETHOD(iicbus_transfer, iicbus_transfer_gen),
+
+ DEVMETHOD_END
+};
+
+static driver_t iicoc_driver = {
+ "iicoc",
+ iicoc_methods,
+ sizeof(struct iicoc_softc),
+};
+
+DRIVER_MODULE(iicoc, simplebus, iicoc_driver, iicoc_devclass, 0, 0);
+DRIVER_MODULE(ofw_iicbus, iicoc, ofw_iicbus_driver, ofw_iicbus_devclass, 0, 0);
+MODULE_DEPEND(iicoc, iicbus, 1, 1, 1);
+MODULE_DEPEND(iicoc, ofw_iicbus, 1, 1, 1);
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