1 /* $Id: imx23_digctl.c,v 1.1 2013/10/07 17:36:40 matt Exp $ */ 2 3 /* 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Petri Laakso. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/param.h> 33 #include <sys/types.h> 34 #include <sys/bus.h> 35 #include <sys/cdefs.h> 36 #include <sys/device.h> 37 #include <sys/errno.h> 38 #include <sys/timetc.h> 39 40 #include <arm/imx/imx23_digctlreg.h> 41 #include <arm/imx/imx23_digctlvar.h> 42 #include <arm/imx/imx23var.h> 43 44 typedef struct digctl_softc { 45 device_t sc_dev; 46 bus_space_tag_t sc_iot; 47 bus_space_handle_t sc_hdl; 48 } *digctl_softc_t; 49 50 static int digctl_match(device_t, cfdata_t, void *); 51 static void digctl_attach(device_t, device_t, void *); 52 static int digctl_activate(device_t, enum devact); 53 54 static void digctl_reset(struct digctl_softc *); 55 static void digctl_init(struct digctl_softc *); 56 57 /* timecounter. */ 58 static u_int digctl_tc_get_timecount(struct timecounter *); 59 60 static digctl_softc_t _sc = NULL; 61 62 CFATTACH_DECL3_NEW(digctl, 63 sizeof(struct digctl_softc), 64 digctl_match, 65 digctl_attach, 66 NULL, 67 digctl_activate, 68 NULL, 69 NULL, 70 0 71 ); 72 73 static struct timecounter tc_useconds; 74 75 #define DCTL_RD(sc, reg) \ 76 bus_space_read_4(sc->sc_iot, sc->sc_hdl, (reg)) 77 #define DCTL_WR(sc, reg, val) \ 78 bus_space_write_4(sc->sc_iot, sc->sc_hdl, (reg), (val)) 79 80 static int 81 digctl_match(device_t parent, cfdata_t match, void *aux) 82 { 83 struct apb_attach_args *aa = aux; 84 85 if ((aa->aa_addr == HW_DIGCTL_BASE) && (aa->aa_size == HW_DIGCTL_SIZE)) 86 return 1; 87 88 return 0; 89 } 90 91 static void 92 digctl_attach(device_t parent, device_t self, void *aux) 93 { 94 struct digctl_softc *sc = device_private(self); 95 struct apb_attach_args *aa = aux; 96 static int digctl_attached = 0; 97 98 sc->sc_dev = self; 99 sc->sc_iot = aa->aa_iot; 100 101 if (digctl_attached) { 102 aprint_error_dev(sc->sc_dev, "already attached\n"); 103 return; 104 } 105 106 if (bus_space_map(sc->sc_iot, aa->aa_addr, aa->aa_size, 0, 107 &sc->sc_hdl)) 108 { 109 aprint_error_dev(sc->sc_dev, "Unable to map bus space\n"); 110 return; 111 } 112 113 digctl_reset(sc); 114 digctl_init(sc); 115 116 aprint_normal("\n"); 117 118 /* 119 * Setup timecounter to use digctl microseconds counter. 120 */ 121 tc_useconds.tc_get_timecount = digctl_tc_get_timecount; 122 tc_useconds.tc_poll_pps = NULL; 123 tc_useconds.tc_counter_mask = 0xffffffff; /* 32bit counter. */ 124 tc_useconds.tc_frequency = 1000000; /* @ 1MHz */ 125 tc_useconds.tc_name = "digctl"; 126 tc_useconds.tc_quality = 100; 127 128 /* Enable counter. */ 129 DCTL_WR(sc, HW_DIGCTL_CTRL_CLR, HW_DIGCTL_CTRL_XTAL24M_GATE); 130 131 tc_init(&tc_useconds); 132 133 digctl_attached = 1; 134 135 return; 136 } 137 138 static int 139 digctl_activate(device_t self, enum devact act) 140 { 141 142 return EOPNOTSUPP; 143 } 144 145 /* 146 * Inspired by i.MX23 RM "39.3.10 Correct Way to Soft Reset a Block" 147 */ 148 static void 149 digctl_reset(struct digctl_softc *sc) 150 { 151 return; 152 } 153 154 static void 155 digctl_init(struct digctl_softc *sc) 156 { 157 _sc = sc; 158 return; 159 } 160 161 /* 162 * Control USB controller clocks. 163 */ 164 void 165 digctl_usb_clkgate(int value) 166 { 167 struct digctl_softc *sc = _sc; 168 169 if (sc == NULL) { 170 aprint_error("digctl is not initalized"); 171 return; 172 } 173 174 if (value) { 175 /* Clocks OFF. */ 176 DCTL_WR(sc, HW_DIGCTL_CTRL_SET, HW_DIGCTL_CTRL_USB_CLKGATE); 177 } else { 178 /* Clocks ON. */ 179 DCTL_WR(sc, HW_DIGCTL_CTRL_CLR, HW_DIGCTL_CTRL_USB_CLKGATE); 180 } 181 182 return; 183 } 184 185 /* 186 * 187 */ 188 static u_int 189 digctl_tc_get_timecount(struct timecounter *tc) 190 { 191 struct digctl_softc *sc = _sc; 192 return DCTL_RD(sc, HW_DIGCTL_MICROSECONDS); 193 } 194