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 1.1 2012/09/01 00:04:44 matt Exp $"); 37 38 #include <sys/bus.h> 39 #include <sys/device.h> 40 #include <sys/intr.h> 41 #include <sys/systm.h> 42 43 #include <arm/broadcom/bcm53xx_reg.h> 44 #include <arm/broadcom/bcm53xx_var.h> 45 46 static int bcmmdio_ccb_match(device_t, cfdata_t, void *); 47 static void bcmmdio_ccb_attach(device_t, device_t, void *); 48 49 CFATTACH_DECL_NEW(bcmmdio_ccb, sizeof(struct bcmmdio_softc), 50 bcmmdio_ccb_match, bcmmdio_ccb_attach, NULL, NULL); 51 52 static inline uint32_t 53 bcmmdio_read_4(struct bcmmdio_softc *sc, bus_size_t o) 54 { 55 return bus_space_read_4(sc->sc_bst, sc->sc_bsh, o); 56 } 57 58 static inline void 59 bcmmdio_write_4(struct bcmmdio_softc *sc, bus_size_t o, uint32_t v) 60 { 61 bus_space_write_4(sc->sc_bst, sc->sc_bsh, o, v); 62 } 63 64 static int 65 bcmmdio_ccb_match(device_t parent, cfdata_t cf, void *aux) 66 { 67 struct bcmccb_attach_args * const ccbaa = aux; 68 const struct bcm_locators * const loc = &ccbaa->ccbaa_loc; 69 70 if (strcmp(cf->cf_name, loc->loc_name)) 71 return 0; 72 73 KASSERT(cf->cf_loc[BCMCCBCF_PORT] == BCMCCBCF_PORT_DEFAULT); 74 75 return 1; 76 } 77 78 static void 79 bcmmdio_ccb_attach(device_t parent, device_t self, void *aux) 80 { 81 struct bcmmdio_softc * const sc = device_private(self); 82 struct bcmccb_attach_args * const ccbaa = aux; 83 const struct bcm_locators * const loc = &ccbaa->ccbaa_loc; 84 85 sc->sc_dev = self; 86 87 sc->sc_bst = ccbaa->ccbaa_ccb_bst; 88 sc->sc_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_VM); 89 90 bus_space_subregion(sc->sc_bst, ccbaa->ccbaa_ccb_bsh, 91 loc->loc_offset, loc->loc_size, &sc->sc_bsh); 92 93 uint32_t miimgt = bcmmdio_read_4(sc, MIIMGT); 94 uint32_t div = __SHIFTOUT(miimgt, MIIMGT_MDCDIV); 95 if (div == 0) { 96 div = 33; // divisor to get 2MHz 97 miimgt &= ~MIIMGT_MDCDIV; 98 miimgt |= __SHIFTIN(div, MIIMGT_MDCDIV); 99 bcmmdio_write_4(sc, MIIMGT, miimgt); 100 } 101 uint32_t freq = 66000000 / div; 102 103 aprint_naive("\n"); 104 aprint_normal(": MDIO bus @ %u MHz\n", freq / 1000000); 105 } 106 107 static void 108 bcmmdio_select_bus(struct bcmmdio_softc *sc, int phy) 109 { 110 uint32_t mgt = bcmmdio_read_4(sc, MIIMGT); 111 uint32_t new_mgt = mgt; 112 113 KASSERT((mgt & MIIMGT_BSY) == 0); 114 if (__BIT(phy) & MII_INTERNAL) { 115 new_mgt &= ~MIIMGT_EXT; 116 } else { 117 new_mgt |= MIIMGT_EXT; 118 } 119 120 if (mgt != new_mgt) 121 bcmmdio_write_4(sc, MIIMGT, new_mgt); 122 } 123 124 static void 125 bcmmdio_busywait(struct bcmmdio_softc *sc) 126 { 127 while (bcmmdio_read_4(sc, MIIMGT) & MIIMGT_BSY) { 128 delay(1); 129 } 130 } 131 132 int 133 bcmmdio_mii_readreg(device_t self, int phy, int reg) 134 { 135 struct bcmmdio_softc * const sc = device_private(self); 136 137 mutex_enter(sc->sc_lock); 138 139 bcmmdio_select_bus(sc, phy); 140 141 bcmmdio_write_4(sc, MIICMD, MIICMD_RD(phy, reg)); 142 143 bcmmdio_busywait(sc); 144 145 int val = __SHIFTOUT(bcmmdio_read_4(sc, MIICMD), MIICMD_DATA); 146 mutex_exit(sc->sc_lock); 147 return val; 148 } 149 150 void 151 bcmmdio_mii_writereg(device_t self, int phy, int reg, int val) 152 { 153 struct bcmmdio_softc * const sc = device_private(self); 154 155 KASSERT((val & 0xffff) == val); 156 157 mutex_enter(sc->sc_lock); 158 159 bcmmdio_select_bus(sc, phy); 160 161 bcmmdio_write_4(sc, MIICMD, MIICMD_WR(phy, reg, val)); 162 163 bcmmdio_busywait(sc); 164 165 mutex_exit(sc->sc_lock); 166 } 167