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