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
bcmmdio_read_4(struct bcmmdio_softc * sc,bus_size_t o)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
bcmmdio_write_4(struct bcmmdio_softc * sc,bus_size_t o,uint32_t v)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
bcmmdio_ccb_match(device_t parent,cfdata_t cf,void * aux)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
bcmmdio_ccb_attach(device_t parent,device_t self,void * aux)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
bcmmdio_select_bus(struct bcmmdio_softc * sc,int phy)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
bcmmdio_busywait(struct bcmmdio_softc * sc)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
bcmmdio_mii_readreg(device_t self,int phy,int reg)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
bcmmdio_mii_writereg(device_t self,int phy,int reg,int val)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