168 lines
4.6 KiB
C
168 lines
4.6 KiB
C
/*-
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* Copyright (c) 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas of 3am Software Foundry.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#define MII_PRIVATE
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#include "locators.h"
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#include <sys/cdefs.h>
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__KERNEL_RCSID(1, "$NetBSD: bcm53xx_mdio.c,v 1.2 2014/02/19 22:21:16 matt Exp $");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/device.h>
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#include <sys/intr.h>
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#include <sys/systm.h>
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#include <arm/broadcom/bcm53xx_reg.h>
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#include <arm/broadcom/bcm53xx_var.h>
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static int bcmmdio_ccb_match(device_t, cfdata_t, void *);
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static void bcmmdio_ccb_attach(device_t, device_t, void *);
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CFATTACH_DECL_NEW(bcmmdio_ccb, sizeof(struct bcmmdio_softc),
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bcmmdio_ccb_match, bcmmdio_ccb_attach, NULL, NULL);
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static inline uint32_t
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bcmmdio_read_4(struct bcmmdio_softc *sc, bus_size_t o)
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{
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return bus_space_read_4(sc->sc_bst, sc->sc_bsh, o);
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}
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static inline void
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bcmmdio_write_4(struct bcmmdio_softc *sc, bus_size_t o, uint32_t v)
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{
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bus_space_write_4(sc->sc_bst, sc->sc_bsh, o, v);
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}
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static int
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bcmmdio_ccb_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct bcmccb_attach_args * const ccbaa = aux;
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const struct bcm_locators * const loc = &ccbaa->ccbaa_loc;
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if (strcmp(cf->cf_name, loc->loc_name))
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return 0;
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KASSERT(cf->cf_loc[BCMCCBCF_PORT] == BCMCCBCF_PORT_DEFAULT);
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return 1;
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}
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static void
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bcmmdio_ccb_attach(device_t parent, device_t self, void *aux)
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{
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struct bcmmdio_softc * const sc = device_private(self);
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struct bcmccb_attach_args * const ccbaa = aux;
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const struct bcm_locators * const loc = &ccbaa->ccbaa_loc;
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sc->sc_dev = self;
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sc->sc_bst = ccbaa->ccbaa_ccb_bst;
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sc->sc_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_VM);
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bus_space_subregion(sc->sc_bst, ccbaa->ccbaa_ccb_bsh,
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loc->loc_offset, loc->loc_size, &sc->sc_bsh);
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uint32_t miimgt = bcmmdio_read_4(sc, MIIMGT);
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uint32_t div = __SHIFTOUT(miimgt, MIIMGT_MDCDIV);
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if (div == 0) {
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div = 33; // divisor to get 2MHz
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miimgt &= ~MIIMGT_MDCDIV;
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miimgt |= __SHIFTIN(div, MIIMGT_MDCDIV);
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bcmmdio_write_4(sc, MIIMGT, miimgt);
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}
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uint32_t freq = 66000000 / div;
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aprint_naive("\n");
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aprint_normal(": MDIO bus @ %u MHz\n", freq / 1000000);
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}
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static void
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bcmmdio_select_bus(struct bcmmdio_softc *sc, int phy)
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{
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uint32_t mgt = bcmmdio_read_4(sc, MIIMGT);
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uint32_t new_mgt = mgt;
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KASSERT((mgt & MIIMGT_BSY) == 0);
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if (__BIT(phy) & MII_INTERNAL) {
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new_mgt &= ~MIIMGT_EXT;
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} else {
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new_mgt |= MIIMGT_EXT;
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}
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if (mgt != new_mgt)
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bcmmdio_write_4(sc, MIIMGT, new_mgt);
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}
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static void
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bcmmdio_busywait(struct bcmmdio_softc *sc)
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{
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while (bcmmdio_read_4(sc, MIIMGT) & MIIMGT_BSY) {
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delay(1);
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}
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}
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int
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bcmmdio_mii_readreg(device_t self, int phy, int reg)
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{
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struct bcmmdio_softc * const sc = device_private(self);
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mutex_enter(sc->sc_lock);
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bcmmdio_select_bus(sc, phy);
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bcmmdio_write_4(sc, MIICMD, MIICMD_RD(phy, reg));
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bcmmdio_busywait(sc);
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int val = __SHIFTOUT(bcmmdio_read_4(sc, MIICMD), MIICMD_DATA);
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mutex_exit(sc->sc_lock);
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return val;
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}
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void
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bcmmdio_mii_writereg(device_t self, int phy, int reg, int val)
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{
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struct bcmmdio_softc * const sc = device_private(self);
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KASSERT((val & 0xffff) == val);
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mutex_enter(sc->sc_lock);
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bcmmdio_select_bus(sc, phy);
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bcmmdio_write_4(sc, MIICMD, MIICMD_WR(phy, reg, val));
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bcmmdio_busywait(sc);
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mutex_exit(sc->sc_lock);
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}
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