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/* $NetBSD: mii.c,v 1.12 1999/08/03 19:41:49 drochner Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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: release/9.1.0/sys/dev/mii/mii.c 230711 2012-01-29 01:01:32Z marius $");
/*
* MII bus layer, glues MII-capable network interface drivers to sharable
* PHY drivers. This exports an interface compatible with BSD/OS 3.0's,
* plus some NetBSD extensions.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <net/if.h>
#include <net/if_media.h>
#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
MODULE_VERSION(miibus, 1);
#include "miibus_if.h"
static device_attach_t miibus_attach;
static bus_child_location_str_t miibus_child_location_str;
static bus_child_pnpinfo_str_t miibus_child_pnpinfo_str;
static device_detach_t miibus_detach;
static bus_hinted_child_t miibus_hinted_child;
static bus_print_child_t miibus_print_child;
static device_probe_t miibus_probe;
static bus_read_ivar_t miibus_read_ivar;
static miibus_readreg_t miibus_readreg;
static miibus_statchg_t miibus_statchg;
static miibus_writereg_t miibus_writereg;
static miibus_linkchg_t miibus_linkchg;
static miibus_mediainit_t miibus_mediainit;
static unsigned char mii_bitreverse(unsigned char x);
static device_method_t miibus_methods[] = {
/* device interface */
DEVMETHOD(device_probe, miibus_probe),
DEVMETHOD(device_attach, miibus_attach),
DEVMETHOD(device_detach, miibus_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
/* bus interface */
DEVMETHOD(bus_print_child, miibus_print_child),
DEVMETHOD(bus_read_ivar, miibus_read_ivar),
DEVMETHOD(bus_child_pnpinfo_str, miibus_child_pnpinfo_str),
DEVMETHOD(bus_child_location_str, miibus_child_location_str),
DEVMETHOD(bus_hinted_child, miibus_hinted_child),
/* MII interface */
DEVMETHOD(miibus_readreg, miibus_readreg),
DEVMETHOD(miibus_writereg, miibus_writereg),
DEVMETHOD(miibus_statchg, miibus_statchg),
DEVMETHOD(miibus_linkchg, miibus_linkchg),
DEVMETHOD(miibus_mediainit, miibus_mediainit),
DEVMETHOD_END
};
devclass_t miibus_devclass;
driver_t miibus_driver = {
"miibus",
miibus_methods,
sizeof(struct mii_data)
};
struct miibus_ivars {
struct ifnet *ifp;
ifm_change_cb_t ifmedia_upd;
ifm_stat_cb_t ifmedia_sts;
u_int mii_flags;
u_int mii_offset;
};
static int
miibus_probe(device_t dev)
{
device_set_desc(dev, "MII bus");
return (BUS_PROBE_SPECIFIC);
}
static int
miibus_attach(device_t dev)
{
struct miibus_ivars *ivars;
struct mii_attach_args *ma;
struct mii_data *mii;
device_t *children;
int i, nchildren;
mii = device_get_softc(dev);
if (device_get_children(dev, &children, &nchildren) == 0) {
for (i = 0; i < nchildren; i++) {
ma = device_get_ivars(children[i]);
ma->mii_data = mii;
}
free(children, M_TEMP);
}
if (nchildren == 0) {
device_printf(dev, "cannot get children\n");
return (ENXIO);
}
ivars = device_get_ivars(dev);
ifmedia_init(&mii->mii_media, IFM_IMASK, ivars->ifmedia_upd,
ivars->ifmedia_sts);
mii->mii_ifp = ivars->ifp;
mii->mii_ifp->if_capabilities |= IFCAP_LINKSTATE;
mii->mii_ifp->if_capenable |= IFCAP_LINKSTATE;
LIST_INIT(&mii->mii_phys);
return (bus_generic_attach(dev));
}
static int
miibus_detach(device_t dev)
{
struct mii_data *mii;
bus_generic_detach(dev);
mii = device_get_softc(dev);
ifmedia_removeall(&mii->mii_media);
mii->mii_ifp = NULL;
return (0);
}
static int
miibus_print_child(device_t dev, device_t child)
{
struct mii_attach_args *ma;
int retval;
ma = device_get_ivars(child);
retval = bus_print_child_header(dev, child);
retval += printf(" PHY %d", ma->mii_phyno);
retval += bus_print_child_footer(dev, child);
return (retval);
}
static int
miibus_read_ivar(device_t dev, device_t child __unused, int which,
uintptr_t *result)
{
struct miibus_ivars *ivars;
/*
* NB: this uses the instance variables of the miibus rather than
* its PHY children.
*/
ivars = device_get_ivars(dev);
switch (which) {
case MIIBUS_IVAR_FLAGS:
*result = ivars->mii_flags;
break;
default:
return (ENOENT);
}
return (0);
}
static int
miibus_child_pnpinfo_str(device_t dev __unused, device_t child, char *buf,
size_t buflen)
{
struct mii_attach_args *ma;
ma = device_get_ivars(child);
snprintf(buf, buflen, "oui=0x%x model=0x%x rev=0x%x",
MII_OUI(ma->mii_id1, ma->mii_id2),
MII_MODEL(ma->mii_id2), MII_REV(ma->mii_id2));
return (0);
}
static int
miibus_child_location_str(device_t dev __unused, device_t child, char *buf,
size_t buflen)
{
struct mii_attach_args *ma;
ma = device_get_ivars(child);
snprintf(buf, buflen, "phyno=%d", ma->mii_phyno);
return (0);
}
static void
miibus_hinted_child(device_t dev, const char *name, int unit)
{
struct miibus_ivars *ivars;
struct mii_attach_args *args, *ma;
device_t *children, phy;
int i, nchildren;
u_int val;
if (resource_int_value(name, unit, "phyno", &val) != 0)
return;
if (device_get_children(dev, &children, &nchildren) != 0)
return;
ma = NULL;
for (i = 0; i < nchildren; i++) {
args = device_get_ivars(children[i]);
if (args->mii_phyno == val) {
ma = args;
break;
}
}
free(children, M_TEMP);
/*
* Don't add a PHY that was automatically identified by having media
* in its BMSR twice, only allow to alter its attach arguments.
*/
if (ma == NULL) {
ma = malloc(sizeof(struct mii_attach_args), M_DEVBUF,
M_NOWAIT);
if (ma == NULL)
return;
phy = device_add_child(dev, name, unit);
if (phy == NULL) {
free(ma, M_DEVBUF);
return;
}
ivars = device_get_ivars(dev);
ma->mii_phyno = val;
ma->mii_offset = ivars->mii_offset++;
ma->mii_id1 = 0;
ma->mii_id2 = 0;
ma->mii_capmask = BMSR_DEFCAPMASK;
device_set_ivars(phy, ma);
}
if (resource_int_value(name, unit, "id1", &val) == 0)
ma->mii_id1 = val;
if (resource_int_value(name, unit, "id2", &val) == 0)
ma->mii_id2 = val;
if (resource_int_value(name, unit, "capmask", &val) == 0)
ma->mii_capmask = val;
}
static int
miibus_readreg(device_t dev, int phy, int reg)
{
device_t parent;
parent = device_get_parent(dev);
return (MIIBUS_READREG(parent, phy, reg));
}
static int
miibus_writereg(device_t dev, int phy, int reg, int data)
{
device_t parent;
parent = device_get_parent(dev);
return (MIIBUS_WRITEREG(parent, phy, reg, data));
}
static void
miibus_statchg(device_t dev)
{
device_t parent;
struct mii_data *mii;
parent = device_get_parent(dev);
MIIBUS_STATCHG(parent);
mii = device_get_softc(dev);
mii->mii_ifp->if_baudrate = ifmedia_baudrate(mii->mii_media_active);
}
static void
miibus_linkchg(device_t dev)
{
struct mii_data *mii;
device_t parent;
int link_state;
parent = device_get_parent(dev);
MIIBUS_LINKCHG(parent);
mii = device_get_softc(dev);
if (mii->mii_media_status & IFM_AVALID) {
if (mii->mii_media_status & IFM_ACTIVE)
link_state = LINK_STATE_UP;
else
link_state = LINK_STATE_DOWN;
} else
link_state = LINK_STATE_UNKNOWN;
if_link_state_change(mii->mii_ifp, link_state);
}
static void
miibus_mediainit(device_t dev)
{
struct mii_data *mii;
struct ifmedia_entry *m;
int media = 0;
/* Poke the parent in case it has any media of its own to add. */
MIIBUS_MEDIAINIT(device_get_parent(dev));
mii = device_get_softc(dev);
LIST_FOREACH(m, &mii->mii_media.ifm_list, ifm_list) {
media = m->ifm_media;
if (media == (IFM_ETHER | IFM_AUTO))
break;
}
ifmedia_set(&mii->mii_media, media);
}
/*
* Helper function used by network interface drivers, attaches the miibus and
* the PHYs to the network interface driver parent.
*/
int
mii_attach(device_t dev, device_t *miibus, struct ifnet *ifp,
ifm_change_cb_t ifmedia_upd, ifm_stat_cb_t ifmedia_sts, int capmask,
int phyloc, int offloc, int flags)
{
struct miibus_ivars *ivars;
struct mii_attach_args *args, ma;
device_t *children, phy;
int bmsr, first, i, nchildren, phymax, phymin, rv;
uint32_t phymask;
if (phyloc != MII_PHY_ANY && offloc != MII_OFFSET_ANY) {
printf("%s: phyloc and offloc specified\n", __func__);
return (EINVAL);
}
if (offloc != MII_OFFSET_ANY && (offloc < 0 || offloc >= MII_NPHY)) {
printf("%s: ivalid offloc %d\n", __func__, offloc);
return (EINVAL);
}
if (phyloc == MII_PHY_ANY) {
phymin = 0;
phymax = MII_NPHY - 1;
} else {
if (phyloc < 0 || phyloc >= MII_NPHY) {
printf("%s: ivalid phyloc %d\n", __func__, phyloc);
return (EINVAL);
}
phymin = phymax = phyloc;
}
first = 0;
if (*miibus == NULL) {
first = 1;
ivars = malloc(sizeof(*ivars), M_DEVBUF, M_NOWAIT);
if (ivars == NULL)
return (ENOMEM);
ivars->ifp = ifp;
ivars->ifmedia_upd = ifmedia_upd;
ivars->ifmedia_sts = ifmedia_sts;
ivars->mii_flags = flags;
*miibus = device_add_child(dev, "miibus", -1);
if (*miibus == NULL) {
rv = ENXIO;
goto fail;
}
device_set_ivars(*miibus, ivars);
} else {
ivars = device_get_ivars(*miibus);
if (ivars->ifp != ifp || ivars->ifmedia_upd != ifmedia_upd ||
ivars->ifmedia_sts != ifmedia_sts ||
ivars->mii_flags != flags) {
printf("%s: non-matching invariant\n", __func__);
return (EINVAL);
}
/*
* Assignment of the attach arguments mii_data for the first
* pass is done in miibus_attach(), i.e. once the miibus softc
* has been allocated.
*/
ma.mii_data = device_get_softc(*miibus);
}
ma.mii_capmask = capmask;
if (resource_int_value(device_get_name(*miibus),
device_get_unit(*miibus), "phymask", &phymask) != 0)
phymask = 0xffffffff;
if (device_get_children(*miibus, &children, &nchildren) != 0) {
children = NULL;
nchildren = 0;
}
ivars->mii_offset = 0;
for (ma.mii_phyno = phymin; ma.mii_phyno <= phymax; ma.mii_phyno++) {
/*
* Make sure we haven't already configured a PHY at this
* address. This allows mii_attach() to be called
* multiple times.
*/
for (i = 0; i < nchildren; i++) {
args = device_get_ivars(children[i]);
if (args->mii_phyno == ma.mii_phyno) {
/*
* Yes, there is already something
* configured at this address.
*/
goto skip;
}
}
/*
* Check to see if there is a PHY at this address. Note,
* many braindead PHYs report 0/0 in their ID registers,
* so we test for media in the BMSR.
*/
bmsr = MIIBUS_READREG(dev, ma.mii_phyno, MII_BMSR);
if (bmsr == 0 || bmsr == 0xffff ||
(bmsr & (BMSR_EXTSTAT | BMSR_MEDIAMASK)) == 0) {
/* Assume no PHY at this address. */
continue;
}
/*
* There is a PHY at this address. If we were given an
* `offset' locator, skip this PHY if it doesn't match.
*/
if (offloc != MII_OFFSET_ANY && offloc != ivars->mii_offset)
goto skip;
/*
* Skip this PHY if it's not included in the phymask hint.
*/
if ((phymask & (1 << ma.mii_phyno)) == 0)
goto skip;
/*
* Extract the IDs. Braindead PHYs will be handled by
* the `ukphy' driver, as we have no ID information to
* match on.
*/
ma.mii_id1 = MIIBUS_READREG(dev, ma.mii_phyno, MII_PHYIDR1);
ma.mii_id2 = MIIBUS_READREG(dev, ma.mii_phyno, MII_PHYIDR2);
ma.mii_offset = ivars->mii_offset;
args = malloc(sizeof(struct mii_attach_args), M_DEVBUF,
M_NOWAIT);
if (args == NULL)
goto skip;
bcopy((char *)&ma, (char *)args, sizeof(ma));
phy = device_add_child(*miibus, NULL, -1);
if (phy == NULL) {
free(args, M_DEVBUF);
goto skip;
}
device_set_ivars(phy, args);
skip:
ivars->mii_offset++;
}
free(children, M_TEMP);
if (first != 0) {
rv = device_set_driver(*miibus, &miibus_driver);
if (rv != 0)
goto fail;
bus_enumerate_hinted_children(*miibus);
rv = device_get_children(*miibus, &children, &nchildren);
if (rv != 0)
goto fail;
free(children, M_TEMP);
if (nchildren == 0) {
rv = ENXIO;
goto fail;
}
rv = bus_generic_attach(dev);
if (rv != 0)
goto fail;
/* Attaching of the PHY drivers is done in miibus_attach(). */
return (0);
}
rv = bus_generic_attach(*miibus);
if (rv != 0)
goto fail;
return (0);
fail:
if (*miibus != NULL)
device_delete_child(dev, *miibus);
free(ivars, M_DEVBUF);
if (first != 0)
*miibus = NULL;
return (rv);
}
/*
* Media changed; notify all PHYs.
*/
int
mii_mediachg(struct mii_data *mii)
{
struct mii_softc *child;
struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
int rv;
mii->mii_media_status = 0;
mii->mii_media_active = IFM_NONE;
LIST_FOREACH(child, &mii->mii_phys, mii_list) {
/*
* If the media indicates a different PHY instance,
* isolate this one.
*/
if (IFM_INST(ife->ifm_media) != child->mii_inst) {
if ((child->mii_flags & MIIF_NOISOLATE) != 0) {
device_printf(child->mii_dev, "%s: "
"can't handle non-zero PHY instance %d\n",
__func__, child->mii_inst);
continue;
}
PHY_WRITE(child, MII_BMCR, PHY_READ(child, MII_BMCR) |
BMCR_ISO);
continue;
}
rv = PHY_SERVICE(child, mii, MII_MEDIACHG);
if (rv)
return (rv);
}
return (0);
}
/*
* Call the PHY tick routines, used during autonegotiation.
*/
void
mii_tick(struct mii_data *mii)
{
struct mii_softc *child;
struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
LIST_FOREACH(child, &mii->mii_phys, mii_list) {
/*
* If this PHY instance isn't currently selected, just skip
* it.
*/
if (IFM_INST(ife->ifm_media) != child->mii_inst)
continue;
(void)PHY_SERVICE(child, mii, MII_TICK);
}
}
/*
* Get media status from PHYs.
*/
void
mii_pollstat(struct mii_data *mii)
{
struct mii_softc *child;
struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
mii->mii_media_status = 0;
mii->mii_media_active = IFM_NONE;
LIST_FOREACH(child, &mii->mii_phys, mii_list) {
/*
* If we're not polling this PHY instance, just skip it.
*/
if (IFM_INST(ife->ifm_media) != child->mii_inst)
continue;
(void)PHY_SERVICE(child, mii, MII_POLLSTAT);
}
}
/*
* Inform the PHYs that the interface is down.
*/
void
mii_down(struct mii_data *mii)
{
struct mii_softc *child;
LIST_FOREACH(child, &mii->mii_phys, mii_list)
mii_phy_down(child);
}
static unsigned char
mii_bitreverse(unsigned char x)
{
static unsigned const char const nibbletab[16] = {
0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 11, 7, 15
};
return ((nibbletab[x & 15] << 4) | nibbletab[x >> 4]);
}
u_int
mii_oui(u_int id1, u_int id2)
{
u_int h;
h = (id1 << 6) | (id2 >> 10);
return ((mii_bitreverse(h >> 16) << 16) |
(mii_bitreverse((h >> 8) & 0xff) << 8) |
mii_bitreverse(h & 0xff));
}