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Date:      Fri, 20 Dec 2019 03:40:51 +0000 (UTC)
From:      Philip Paeps <philip@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r355924 - in head/sys: conf dev/iicbus
Message-ID:  <201912200340.xBK3epN5063596@repo.freebsd.org>

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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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