1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2018 Rubicon Communications, LLC (Netgate) 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/bus.h> 36 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/rman.h> 40 #include <sys/lock.h> 41 #include <sys/mutex.h> 42 43 #include <machine/bus.h> 44 #include <machine/resource.h> 45 #include <machine/intr.h> 46 47 #include <dev/extres/clk/clk_fixed.h> 48 #include <dev/extres/syscon/syscon.h> 49 50 #include <dev/ofw/ofw_bus.h> 51 #include <dev/ofw/ofw_bus_subr.h> 52 53 #include "syscon_if.h" 54 55 static struct clk_fixed_def ap806_clk_cluster_0 = { 56 .clkdef.id = 0, 57 .clkdef.name = "ap806-cpu-cluster-0", 58 .freq = 0, 59 }; 60 61 static struct clk_fixed_def ap806_clk_cluster_1 = { 62 .clkdef.id = 1, 63 .clkdef.name = "ap806-cpu-cluster-1", 64 .freq = 0, 65 }; 66 67 static struct clk_fixed_def ap806_clk_fixed = { 68 .clkdef.id = 2, 69 .clkdef.name = "ap806-fixed", 70 .freq = 1200000000, 71 }; 72 73 /* Thoses are the only exported clocks AFAICT */ 74 75 static const char *mss_parents[] = {"ap806-fixed"}; 76 static struct clk_fixed_def ap806_clk_mss = { 77 .clkdef.id = 3, 78 .clkdef.name = "ap806-mss", 79 .clkdef.parent_names = mss_parents, 80 .clkdef.parent_cnt = 1, 81 .mult = 1, 82 .div = 6, 83 }; 84 85 static const char *sdio_parents[] = {"ap806-fixed"}; 86 static struct clk_fixed_def ap806_clk_sdio = { 87 .clkdef.id = 4, 88 .clkdef.name = "ap806-sdio", 89 .clkdef.parent_names = sdio_parents, 90 .clkdef.parent_cnt = 1, 91 .mult = 1, 92 .div = 3, 93 }; 94 95 struct mv_ap806_clock_softc { 96 device_t dev; 97 struct syscon *syscon; 98 }; 99 100 static struct ofw_compat_data compat_data[] = { 101 {"marvell,ap806-clock", 1}, 102 {NULL, 0} 103 }; 104 105 #define RD4(sc, reg) SYSCON_READ_4((sc)->syscon, (reg)) 106 #define WR4(sc, reg, val) SYSCON_WRITE_4((sc)->syscon, (reg), (val)) 107 108 static int 109 mv_ap806_clock_probe(device_t dev) 110 { 111 112 if (!ofw_bus_status_okay(dev)) 113 return (ENXIO); 114 115 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 116 return (ENXIO); 117 118 device_set_desc(dev, "Marvell AP806 Clock Controller"); 119 return (BUS_PROBE_DEFAULT); 120 } 121 122 static int 123 mv_ap806_clock_attach(device_t dev) 124 { 125 struct mv_ap806_clock_softc *sc; 126 struct clkdom *clkdom; 127 uint64_t clock_freq; 128 uint32_t reg; 129 130 sc = device_get_softc(dev); 131 sc->dev = dev; 132 133 if (SYSCON_GET_HANDLE(sc->dev, &sc->syscon) != 0 || 134 sc->syscon == NULL) { 135 device_printf(dev, "cannot get syscon for device\n"); 136 return (ENXIO); 137 } 138 139 /* 140 * We might miss some combinations 141 * Those are the only possible ones on the mcbin 142 */ 143 reg = RD4(sc, 0x400); 144 switch (reg & 0x1f) { 145 case 0x0: 146 case 0x1: 147 clock_freq = 2000000000; 148 break; 149 case 0x6: 150 clock_freq = 1800000000; 151 break; 152 case 0xd: 153 clock_freq = 1600000000; 154 break; 155 case 0x14: 156 clock_freq = 1333000000; 157 break; 158 default: 159 device_printf(dev, "Cannot guess clock freq with reg %x\n", 160 reg & 0x1f); 161 return (ENXIO); 162 break; 163 }; 164 165 ap806_clk_cluster_0.freq = clock_freq; 166 ap806_clk_cluster_1.freq = clock_freq; 167 clkdom = clkdom_create(dev); 168 169 clknode_fixed_register(clkdom, &ap806_clk_cluster_0); 170 clknode_fixed_register(clkdom, &ap806_clk_cluster_1); 171 clknode_fixed_register(clkdom, &ap806_clk_fixed); 172 clknode_fixed_register(clkdom, &ap806_clk_mss); 173 clknode_fixed_register(clkdom, &ap806_clk_sdio); 174 175 clkdom_finit(clkdom); 176 177 if (bootverbose) 178 clkdom_dump(clkdom); 179 return (0); 180 } 181 182 static int 183 mv_ap806_clock_detach(device_t dev) 184 { 185 186 return (EBUSY); 187 } 188 189 static device_method_t mv_ap806_clock_methods[] = { 190 /* Device interface */ 191 DEVMETHOD(device_probe, mv_ap806_clock_probe), 192 DEVMETHOD(device_attach, mv_ap806_clock_attach), 193 DEVMETHOD(device_detach, mv_ap806_clock_detach), 194 195 DEVMETHOD_END 196 }; 197 198 static devclass_t mv_ap806_clock_devclass; 199 200 static driver_t mv_ap806_clock_driver = { 201 "mv_ap806_clock", 202 mv_ap806_clock_methods, 203 sizeof(struct mv_ap806_clock_softc), 204 }; 205 206 EARLY_DRIVER_MODULE(mv_ap806_clock, simplebus, mv_ap806_clock_driver, 207 mv_ap806_clock_devclass, 0, 0, BUS_PASS_RESOURCE + BUS_PASS_ORDER_LATE); 208