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      1 /*-
      2  * Copyright (c) 2012 The NetBSD Foundation, Inc.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to The NetBSD Foundation
      6  * by Matt Thomas of 3am Software Foundry.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     27  * POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #define MII_PRIVATE
     31 
     32 #include "locators.h"
     33 
     34 #include <sys/cdefs.h>
     35 
     36 __KERNEL_RCSID(1, "$NetBSD: bcm53xx_mdio.c,v 1.2 2014/02/19 22:21:16 matt Exp $");
     37 
     38 #include <sys/param.h>
     39 #include <sys/bus.h>
     40 #include <sys/device.h>
     41 #include <sys/intr.h>
     42 #include <sys/systm.h>
     43 
     44 #include <arm/broadcom/bcm53xx_reg.h>
     45 #include <arm/broadcom/bcm53xx_var.h>
     46 
     47 static int bcmmdio_ccb_match(device_t, cfdata_t, void *);
     48 static void bcmmdio_ccb_attach(device_t, device_t, void *);
     49 
     50 CFATTACH_DECL_NEW(bcmmdio_ccb, sizeof(struct bcmmdio_softc),
     51 	bcmmdio_ccb_match, bcmmdio_ccb_attach, NULL, NULL);
     52 
     53 static inline uint32_t
     54 bcmmdio_read_4(struct bcmmdio_softc *sc, bus_size_t o)
     55 {
     56 	return bus_space_read_4(sc->sc_bst, sc->sc_bsh, o);
     57 }
     58 
     59 static inline void
     60 bcmmdio_write_4(struct bcmmdio_softc *sc, bus_size_t o, uint32_t v)
     61 {
     62 	bus_space_write_4(sc->sc_bst, sc->sc_bsh, o, v);
     63 }
     64 
     65 static int
     66 bcmmdio_ccb_match(device_t parent, cfdata_t cf, void *aux)
     67 {
     68 	struct bcmccb_attach_args * const ccbaa = aux;
     69 	const struct bcm_locators * const loc = &ccbaa->ccbaa_loc;
     70 
     71 	if (strcmp(cf->cf_name, loc->loc_name))
     72 		return 0;
     73 
     74 	KASSERT(cf->cf_loc[BCMCCBCF_PORT] == BCMCCBCF_PORT_DEFAULT);
     75 
     76 	return 1;
     77 }
     78 
     79 static void
     80 bcmmdio_ccb_attach(device_t parent, device_t self, void *aux)
     81 {
     82 	struct bcmmdio_softc * const sc = device_private(self);
     83 	struct bcmccb_attach_args * const ccbaa = aux;
     84 	const struct bcm_locators * const loc = &ccbaa->ccbaa_loc;
     85 
     86 	sc->sc_dev = self;
     87 
     88 	sc->sc_bst = ccbaa->ccbaa_ccb_bst;
     89 	sc->sc_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_VM);
     90 
     91 	bus_space_subregion(sc->sc_bst, ccbaa->ccbaa_ccb_bsh,
     92 	    loc->loc_offset, loc->loc_size, &sc->sc_bsh);
     93 
     94 	uint32_t miimgt = bcmmdio_read_4(sc, MIIMGT);
     95 	uint32_t div = __SHIFTOUT(miimgt, MIIMGT_MDCDIV);
     96 	if (div == 0) {
     97 		div = 33;			// divisor to get 2MHz
     98 		miimgt &= ~MIIMGT_MDCDIV;
     99 		miimgt |= __SHIFTIN(div, MIIMGT_MDCDIV);
    100 		bcmmdio_write_4(sc, MIIMGT, miimgt);
    101 	}
    102 	uint32_t freq = 66000000 / div;
    103 
    104 	aprint_naive("\n");
    105 	aprint_normal(": MDIO bus @ %u MHz\n", freq / 1000000);
    106 }
    107 
    108 static void
    109 bcmmdio_select_bus(struct bcmmdio_softc *sc, int phy)
    110 {
    111 	uint32_t mgt = bcmmdio_read_4(sc, MIIMGT);
    112 	uint32_t new_mgt = mgt;
    113 
    114 	KASSERT((mgt & MIIMGT_BSY) == 0);
    115 	if (__BIT(phy) & MII_INTERNAL) {
    116 		new_mgt &= ~MIIMGT_EXT;
    117 	} else {
    118 		new_mgt |= MIIMGT_EXT;
    119 	}
    120 
    121 	if (mgt != new_mgt)
    122 		bcmmdio_write_4(sc, MIIMGT, new_mgt);
    123 }
    124 
    125 static void
    126 bcmmdio_busywait(struct bcmmdio_softc *sc)
    127 {
    128 	while (bcmmdio_read_4(sc, MIIMGT) & MIIMGT_BSY) {
    129 		delay(1);
    130 	}
    131 }
    132 
    133 int
    134 bcmmdio_mii_readreg(device_t self, int phy, int reg)
    135 {
    136 	struct bcmmdio_softc * const sc = device_private(self);
    137 
    138 	mutex_enter(sc->sc_lock);
    139 
    140 	bcmmdio_select_bus(sc, phy);
    141 
    142 	bcmmdio_write_4(sc, MIICMD, MIICMD_RD(phy, reg));
    143 
    144 	bcmmdio_busywait(sc);
    145 
    146 	int val = __SHIFTOUT(bcmmdio_read_4(sc, MIICMD), MIICMD_DATA);
    147 	mutex_exit(sc->sc_lock);
    148 	return val;
    149 }
    150 
    151 void
    152 bcmmdio_mii_writereg(device_t self, int phy, int reg, int val)
    153 {
    154 	struct bcmmdio_softc * const sc = device_private(self);
    155 
    156 	KASSERT((val & 0xffff) == val);
    157 
    158 	mutex_enter(sc->sc_lock);
    159 
    160 	bcmmdio_select_bus(sc, phy);
    161 
    162 	bcmmdio_write_4(sc, MIICMD, MIICMD_WR(phy, reg, val));
    163 
    164 	bcmmdio_busywait(sc);
    165 
    166 	mutex_exit(sc->sc_lock);
    167 }
    168