1 /* $Id: imx23_clkctrl.c,v 1.3 2019/10/18 04:09:01 msaitoh 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 39 #include <arm/imx/imx23_clkctrlreg.h> 40 #include <arm/imx/imx23_clkctrlvar.h> 41 #include <arm/imx/imx23var.h> 42 43 typedef struct clkctrl_softc { 44 device_t sc_dev; 45 bus_space_tag_t sc_iot; 46 bus_space_handle_t sc_hdl; 47 } *clkctrl_softc_t; 48 49 static int clkctrl_match(device_t, cfdata_t, void *); 50 static void clkctrl_attach(device_t, device_t, void *); 51 static int clkctrl_activate(device_t, enum devact); 52 53 static void clkctrl_init(struct clkctrl_softc *); 54 55 static clkctrl_softc_t _sc = NULL; 56 57 CFATTACH_DECL3_NEW(clkctrl, 58 sizeof(struct clkctrl_softc), 59 clkctrl_match, 60 clkctrl_attach, 61 NULL, 62 clkctrl_activate, 63 NULL, 64 NULL, 65 0 66 ); 67 68 #define CLKCTRL_RD(sc, reg) \ 69 bus_space_read_4(sc->sc_iot, sc->sc_hdl, (reg)) 70 #define CLKCTRL_WR(sc, reg, val) \ 71 bus_space_write_4(sc->sc_iot, sc->sc_hdl, (reg), (val)) 72 73 #define CLKCTRL_SOFT_RST_LOOP 455 /* At least 1 us ... */ 74 75 static int 76 clkctrl_match(device_t parent, cfdata_t match, void *aux) 77 { 78 struct apb_attach_args *aa = aux; 79 80 if ((aa->aa_addr == HW_CLKCTRL_BASE) && 81 (aa->aa_size == HW_CLKCTRL_SIZE)) 82 return 1; 83 84 return 0; 85 } 86 87 static void 88 clkctrl_attach(device_t parent, device_t self, void *aux) 89 { 90 struct clkctrl_softc *sc = device_private(self); 91 struct apb_attach_args *aa = aux; 92 static int clkctrl_attached = 0; 93 94 sc->sc_dev = self; 95 sc->sc_iot = aa->aa_iot; 96 97 if (clkctrl_attached) { 98 aprint_error_dev(sc->sc_dev, "already attached\n"); 99 return; 100 } 101 102 if (bus_space_map(sc->sc_iot, aa->aa_addr, aa->aa_size, 0, 103 &sc->sc_hdl)) 104 { 105 aprint_error_dev(sc->sc_dev, "Unable to map bus space\n"); 106 return; 107 } 108 109 110 clkctrl_init(sc); 111 112 aprint_normal("\n"); 113 114 clkctrl_attached = 1; 115 116 return; 117 } 118 119 static int 120 clkctrl_activate(device_t self, enum devact act) 121 { 122 123 return EOPNOTSUPP; 124 } 125 126 static void 127 clkctrl_init(struct clkctrl_softc *sc) 128 { 129 _sc = sc; 130 return; 131 } 132 133 /* 134 * Power up 8-phase PLL outputs for USB PHY 135 * 136 */ 137 void 138 clkctrl_en_usb(void) 139 { 140 struct clkctrl_softc *sc = _sc; 141 142 if (sc == NULL) { 143 aprint_error("clkctrl is not initialized"); 144 return; 145 } 146 147 CLKCTRL_WR(sc, HW_CLKCTRL_PLLCTRL0_SET, 148 HW_CLKCTRL_PLLCTRL0_EN_USB_CLKS); 149 150 return; 151 } 152 153 /* 154 * Enable 24MHz clock for the Digital Filter. 155 * 156 */ 157 void 158 clkctrl_en_filtclk(void) 159 { 160 struct clkctrl_softc *sc = _sc; 161 162 if (sc == NULL) { 163 aprint_error("clkctrl is not initialized"); 164 return; 165 } 166 167 CLKCTRL_WR(sc, HW_CLKCTRL_XTAL_CLR, HW_CLKCTRL_XTAL_FILT_CLK24M_GATE); 168 169 return; 170 } 171