a1f45cd59d
Instead replace it with a different hack, that turns fman into a simplebus subclass, and maps its children within its address space. Since all PHY communication is done through dtsec0's mdio space, the FDT contains a reference to the dtsec0 mdio handle in all nodes that need it. Instead of using Freescale's implementation for MII access, use our own (copied loosely from the eTSEC driver, and could possibly be merged eventually). This lets us access the registers directly rather than needing a full dtsec interface just to access the registers. Future directions will include turning fman into more of a simplebus, and not mapping the region and playing games. This will require changes to the dtsec driver to make it a child of fman, and possibly other drivers as well.
212 lines
5.2 KiB
C
212 lines
5.2 KiB
C
/*-
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* Copyright (c) 2016 Justin Hibbits
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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, this list of conditions and the following 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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* 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/systm.h>
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#include <sys/kernel.h>
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#include <sys/bus.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/resource.h>
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#include <sys/socket.h>
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#include <machine/bus.h>
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#include <net/if.h>
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#include <net/if_media.h>
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#include <net/if_types.h>
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#include <net/if_var.h>
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#include <dev/mii/mii.h>
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#include <dev/mii/miivar.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 <contrib/ncsw/inc/Peripherals/fm_ext.h>
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#include "fman.h"
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#include "miibus_if.h"
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#define MDIO_LOCK() mtx_lock(&sc->sc_lock)
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#define MDIO_UNLOCK() mtx_unlock(&sc->sc_lock)
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#define MDIO_WRITE4(sc,r,v) \
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bus_space_write_4(&bs_be_tag, sc->sc_handle, sc->sc_offset + r, v)
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#define MDIO_READ4(sc, r) \
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bus_space_read_4(&bs_be_tag, sc->sc_handle, sc->sc_offset + r)
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#define MDIO_MIIMCFG 0x0
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#define MDIO_MIIMCOM 0x4
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#define MIIMCOM_SCAN_CYCLE 0x00000002
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#define MIIMCOM_READ_CYCLE 0x00000001
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#define MDIO_MIIMADD 0x8
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#define MDIO_MIIMCON 0xc
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#define MDIO_MIIMSTAT 0x10
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#define MDIO_MIIMIND 0x14
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#define MIIMIND_BUSY 0x1
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static int pqmdio_fdt_probe(device_t dev);
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static int pqmdio_fdt_attach(device_t dev);
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static int pqmdio_detach(device_t dev);
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static int pqmdio_miibus_readreg(device_t dev, int phy, int reg);
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static int pqmdio_miibus_writereg(device_t dev, int phy, int reg, int value);
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struct pqmdio_softc {
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struct mtx sc_lock;
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bus_space_handle_t sc_handle;
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int sc_offset;
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};
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static device_method_t pqmdio_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, pqmdio_fdt_probe),
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DEVMETHOD(device_attach, pqmdio_fdt_attach),
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DEVMETHOD(device_detach, pqmdio_detach),
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/* MII interface */
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DEVMETHOD(miibus_readreg, pqmdio_miibus_readreg),
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DEVMETHOD(miibus_writereg, pqmdio_miibus_writereg),
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{ 0, 0 }
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};
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static struct ofw_compat_data mdio_compat_data[] = {
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{"fsl,fman-mdio", 0},
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{NULL, 0}
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};
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static driver_t pqmdio_driver = {
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"pq_mdio",
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pqmdio_methods,
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sizeof(struct pqmdio_softc),
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};
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static int
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pqmdio_fdt_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_search_compatible(dev, mdio_compat_data)->ocd_str)
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return (ENXIO);
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device_set_desc(dev, "Freescale QorIQ MDIO");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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pqmdio_fdt_attach(device_t dev)
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{
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struct pqmdio_softc *sc;
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rman_res_t start, count;
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sc = device_get_softc(dev);
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fman_get_bushandle(&sc->sc_handle);
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bus_get_resource(dev, SYS_RES_MEMORY, 0, &start, &count);
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sc->sc_offset = start;
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mtx_init(&sc->sc_lock, device_get_nameunit(dev), "QorIQ MDIO lock",
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MTX_DEF);
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return (0);
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}
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static int
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pqmdio_detach(device_t dev)
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{
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struct pqmdio_softc *sc;
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sc = device_get_softc(dev);
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mtx_destroy(&sc->sc_lock);
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return (0);
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}
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int
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pqmdio_miibus_readreg(device_t dev, int phy, int reg)
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{
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struct pqmdio_softc *sc;
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int rv;
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sc = device_get_softc(dev);
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MDIO_LOCK();
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MDIO_WRITE4(sc, MDIO_MIIMADD, (phy << 8) | reg);
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MDIO_WRITE4(sc, MDIO_MIIMCOM, MIIMCOM_READ_CYCLE);
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MDIO_READ4(sc, MDIO_MIIMCOM);
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while ((MDIO_READ4(sc, MDIO_MIIMIND)) & MIIMIND_BUSY)
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;
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rv = MDIO_READ4(sc, MDIO_MIIMSTAT);
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MDIO_WRITE4(sc, MDIO_MIIMCOM, 0);
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MDIO_READ4(sc, MDIO_MIIMCOM);
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MDIO_UNLOCK();
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return (rv);
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}
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int
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pqmdio_miibus_writereg(device_t dev, int phy, int reg, int value)
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{
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struct pqmdio_softc *sc;
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sc = device_get_softc(dev);
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MDIO_LOCK();
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/* Stop the MII management read cycle */
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MDIO_WRITE4(sc, MDIO_MIIMCOM, 0);
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MDIO_READ4(sc, MDIO_MIIMCOM);
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MDIO_WRITE4(sc, MDIO_MIIMADD, (phy << 8) | reg);
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MDIO_WRITE4(sc, MDIO_MIIMCON, value);
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MDIO_READ4(sc, MDIO_MIIMCON);
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/* Wait till MII management write is complete */
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while ((MDIO_READ4(sc, MDIO_MIIMIND)) & MIIMIND_BUSY)
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;
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MDIO_UNLOCK();
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return (0);
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}
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static devclass_t pqmdio_devclass;
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DRIVER_MODULE(pqmdio, fman, pqmdio_driver, pqmdio_devclass, 0, 0);
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DRIVER_MODULE(miibus, pqmdio, miibus_driver, miibus_devclass, 0, 0);
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MODULE_DEPEND(pqmdio, miibus, 1, 1, 1);
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