Author: loos
Date: Fri Dec 6 20:21:07 2019
New Revision: 355462
URL: https://svnweb.freebsd.org/changeset/base/355462
Log:
Add a GPIO based MDIO bit-banging bus driver.
Uses two GPIO pins as MDC (clock) and MDIO (bidirectional I/O), relies
on mii_bitbang.
Tested on SG-3200 where the PHY for one of the ports is wired independently
of the SoC MDIO bus.
Sponsored by: Rubicon Communications, LLC (Netgate)
Added:
head/sys/dev/gpio/gpiomdio.c (contents, props changed)
Modified:
head/sys/conf/files
Modified: head/sys/conf/files
==============================================================================
--- head/sys/conf/files Fri Dec 6 20:05:08 2019 (r355461)
+++ head/sys/conf/files Fri Dec 6 20:21:07 2019 (r355462)
@@ -1753,6 +1753,7 @@ dev/gpio/gpioc.c optional gpio
\
dev/gpio/gpioiic.c optional gpioiic
dev/gpio/gpioled.c optional gpioled !fdt
dev/gpio/gpioled_fdt.c optional gpioled fdt
+dev/gpio/gpiomdio.c optional gpiomdio mii_bitbang
dev/gpio/gpiopower.c optional gpiopower fdt
dev/gpio/gpioregulator.c optional gpioregulator fdt ext_resources
dev/gpio/gpiospi.c optional gpiospi
Added: head/sys/dev/gpio/gpiomdio.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/dev/gpio/gpiomdio.c Fri Dec 6 20:21:07 2019
(r355462)
@@ -0,0 +1,243 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2019 Rubicon Communications, LLC (Netgate)
+ *
+ * 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 AUTHOR 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 AUTHOR 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 "opt_platform.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/gpio.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/socket.h>
+
+#include <net/if.h>
+#include <net/if_media.h>
+#include <net/if_types.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/gpio/gpiobusvar.h>
+#include <dev/mii/mii_bitbang.h>
+#include <dev/mii/miivar.h>
+#include <dev/ofw/ofw_bus.h>
+
+#include "gpiobus_if.h"
+#include "miibus_if.h"
+
+#define GPIOMDIO_MDC_DFLT 0
+#define GPIOMDIO_MDIO_DFLT 1
+#define GPIOMDIO_MIN_PINS 2
+
+#define MDO_BIT 0x01
+#define MDI_BIT 0x02
+#define MDC_BIT 0x04
+#define MDIRPHY_BIT 0x08
+#define MDIRHOST_BIT 0x10
+#define MDO sc->miibb_ops.mbo_bits[MII_BIT_MDO]
+#define MDI sc->miibb_ops.mbo_bits[MII_BIT_MDI]
+#define MDC sc->miibb_ops.mbo_bits[MII_BIT_MDC]
+#define MDIRPHY
sc->miibb_ops.mbo_bits[MII_BIT_DIR_HOST_PHY]
+#define MDIRHOST
sc->miibb_ops.mbo_bits[MII_BIT_DIR_PHY_HOST]
+
+static uint32_t gpiomdio_bb_read(device_t);
+static void gpiomdio_bb_write(device_t, uint32_t);
+
+struct gpiomdio_softc
+{
+ device_t sc_dev;
+ device_t sc_busdev;
+ int mdc_pin;
+ int mdio_pin;
+ struct mii_bitbang_ops miibb_ops;
+};
+
+
+static int
+gpiomdio_probe(device_t dev)
+{
+ struct gpiobus_ivar *devi;
+
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+ if (!ofw_bus_is_compatible(dev, "freebsd,gpiomdio"))
+ return (ENXIO);
+ devi = GPIOBUS_IVAR(dev);
+ if (devi->npins < GPIOMDIO_MIN_PINS) {
+ device_printf(dev,
+ "gpiomdio needs at least %d GPIO pins (only %d given).\n",
+ GPIOMDIO_MIN_PINS, devi->npins);
+ return (ENXIO);
+ }
+ device_set_desc(dev, "GPIO MDIO bit-banging Bus driver");
+
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+gpiomdio_attach(device_t dev)
+{
+ phandle_t node;
+ pcell_t pin;
+ struct gpiobus_ivar *devi;
+ struct gpiomdio_softc *sc;
+
+ sc = device_get_softc(dev);
+ sc->sc_dev = dev;
+ sc->sc_busdev = device_get_parent(dev);
+
+ if ((node = ofw_bus_get_node(dev)) == -1)
+ return (ENXIO);
+ if (OF_getencprop(node, "mdc", &pin, sizeof(pin)) > 0)
+ sc->mdc_pin = (int)pin;
+ if (OF_getencprop(node, "mdio", &pin, sizeof(pin)) > 0)
+ sc->mdio_pin = (int)pin;
+
+ if (sc->mdc_pin < 0 || sc->mdc_pin > 1)
+ sc->mdc_pin = GPIOMDIO_MDC_DFLT;
+ if (sc->mdio_pin < 0 || sc->mdio_pin > 1)
+ sc->mdio_pin = GPIOMDIO_MDIO_DFLT;
+
+ devi = GPIOBUS_IVAR(dev);
+ device_printf(dev, "MDC pin: %d, MDIO pin: %d\n",
+ devi->pins[sc->mdc_pin], devi->pins[sc->mdio_pin]);
+
+ /* Initialize mii_bitbang_ops. */
+ MDO = MDO_BIT;
+ MDI = MDI_BIT;
+ MDC = MDC_BIT;
+ MDIRPHY = MDIRPHY_BIT;
+ MDIRHOST = MDIRHOST_BIT;
+ sc->miibb_ops.mbo_read = gpiomdio_bb_read;
+ sc->miibb_ops.mbo_write = gpiomdio_bb_write;
+
+ /* Register our MDIO Bus device. */
+ OF_device_register_xref(OF_xref_from_node(node), dev);
+
+ return (0);
+}
+
+static uint32_t
+gpiomdio_bb_read(device_t dev)
+{
+ struct gpiomdio_softc *sc;
+ unsigned int val;
+
+ sc = device_get_softc(dev);
+ GPIOBUS_PIN_GET(sc->sc_busdev, sc->sc_dev, sc->mdio_pin, &val);
+
+ return (val != 0 ? MDI_BIT : 0);
+}
+
+static void
+gpiomdio_bb_write(device_t dev, uint32_t val)
+{
+ struct gpiomdio_softc *sc;
+
+ sc = device_get_softc(dev);
+
+ /* Set the data pin state. */
+ if ((val & (MDIRPHY_BIT | MDO_BIT)) == (MDIRPHY_BIT | MDO_BIT))
+ GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, sc->mdio_pin, 1);
+ else if ((val & (MDIRPHY_BIT | MDO_BIT)) == MDIRPHY_BIT)
+ GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, sc->mdio_pin, 0);
+ if (val & MDIRPHY_BIT)
+ GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, sc->mdio_pin,
+ GPIO_PIN_OUTPUT);
+ else if (val & MDIRHOST_BIT)
+ GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, sc->mdio_pin,
+ GPIO_PIN_INPUT);
+
+ /* And now the clock state. */
+ if (val & MDC_BIT)
+ GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, sc->mdc_pin, 1);
+ else
+ GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, sc->mdc_pin, 0);
+ GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, sc->mdc_pin,
+ GPIO_PIN_OUTPUT);
+}
+
+static int
+gpiomdio_readreg(device_t dev, int phy, int reg)
+{
+ struct gpiomdio_softc *sc;
+
+ sc = device_get_softc(dev);
+
+ return (mii_bitbang_readreg(dev, &sc->miibb_ops, phy, reg));
+}
+
+static int
+gpiomdio_writereg(device_t dev, int phy, int reg, int val)
+{
+ struct gpiomdio_softc *sc;
+
+ sc = device_get_softc(dev);
+ mii_bitbang_writereg(dev, &sc->miibb_ops, phy, reg, val);
+
+ return (0);
+}
+
+static phandle_t
+gpiomdio_get_node(device_t bus, device_t dev)
+{
+
+ return (ofw_bus_get_node(bus));
+}
+
+static devclass_t gpiomdio_devclass;
+
+static device_method_t gpiomdio_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, gpiomdio_probe),
+ DEVMETHOD(device_attach, gpiomdio_attach),
+ DEVMETHOD(device_detach, bus_generic_detach),
+
+ /* MDIO interface */
+ DEVMETHOD(miibus_readreg, gpiomdio_readreg),
+ DEVMETHOD(miibus_writereg, gpiomdio_writereg),
+
+ /* OFW bus interface */
+ DEVMETHOD(ofw_bus_get_node, gpiomdio_get_node),
+
+ DEVMETHOD_END
+};
+
+static driver_t gpiomdio_driver = {
+ "gpiomdio",
+ gpiomdio_methods,
+ sizeof(struct gpiomdio_softc),
+};
+
+EARLY_DRIVER_MODULE(gpiomdio, gpiobus, gpiomdio_driver, gpiomdio_devclass,
+ 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
+DRIVER_MODULE(miibus, gpiomdio, miibus_driver, miibus_devclass, 0, 0);
+MODULE_DEPEND(gpiomdio, gpiobus, 1, 1, 1);
+MODULE_DEPEND(gpiomdio, miibus, 1, 1, 1);
+MODULE_DEPEND(gpiomdio, mii_bitbang, 1, 1, 1);
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