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 54 #include "syscon_if.h" 55 56 static struct clk_fixed_def ap806_clk_cluster_0 = { 57 .clkdef.id = 0, 58 .clkdef.name = "ap806-cpu-cluster-0", 59 .freq = 0, 60 }; 61 62 static struct clk_fixed_def ap806_clk_cluster_1 = { 63 .clkdef.id = 1, 64 .clkdef.name = "ap806-cpu-cluster-1", 65 .freq = 0, 66 }; 67 68 static struct clk_fixed_def ap806_clk_fixed = { 69 .clkdef.id = 2, 70 .clkdef.name = "ap806-fixed", 71 .freq = 1200000000, 72 }; 73 74 /* Thoses are the only exported clocks AFAICT */ 75 76 static const char *mss_parents[] = {"ap806-fixed"}; 77 static struct clk_fixed_def ap806_clk_mss = { 78 .clkdef.id = 3, 79 .clkdef.name = "ap806-mss", 80 .clkdef.parent_names = mss_parents, 81 .clkdef.parent_cnt = 1, 82 .mult = 1, 83 .div = 6, 84 }; 85 86 static const char *sdio_parents[] = {"ap806-fixed"}; 87 static struct clk_fixed_def ap806_clk_sdio = { 88 .clkdef.id = 4, 89 .clkdef.name = "ap806-sdio", 90 .clkdef.parent_names = sdio_parents, 91 .clkdef.parent_cnt = 1, 92 .mult = 1, 93 .div = 3, 94 }; 95 96 struct mv_ap806_clock_softc { 97 device_t dev; 98 struct syscon *syscon; 99 }; 100 101 102 103 static struct ofw_compat_data compat_data[] = { 104 {"marvell,ap806-clock", 1}, 105 {NULL, 0} 106 }; 107 108 #define RD4(sc, reg) SYSCON_READ_4((sc)->syscon, (reg)) 109 #define WR4(sc, reg, val) SYSCON_WRITE_4((sc)->syscon, (reg), (val)) 110 111 static int 112 mv_ap806_clock_probe(device_t dev) 113 { 114 115 if (!ofw_bus_status_okay(dev)) 116 return (ENXIO); 117 118 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 119 return (ENXIO); 120 121 device_set_desc(dev, "Marvell AP806 Clock Controller"); 122 return (BUS_PROBE_DEFAULT); 123 } 124 125 static int 126 mv_ap806_clock_attach(device_t dev) 127 { 128 struct mv_ap806_clock_softc *sc; 129 struct clkdom *clkdom; 130 uint64_t clock_freq; 131 uint32_t reg; 132 133 sc = device_get_softc(dev); 134 sc->dev = dev; 135 136 if (SYSCON_GET_HANDLE(sc->dev, &sc->syscon) != 0 || 137 sc->syscon == NULL) { 138 device_printf(dev, "cannot get syscon for device\n"); 139 return (ENXIO); 140 } 141 142 /* 143 * We might miss some combinations 144 * Those are the only possible ones on the mcbin 145 */ 146 reg = RD4(sc, 0x400); 147 switch (reg & 0x1f) { 148 case 0x0: 149 case 0x1: 150 clock_freq = 2000000000; 151 break; 152 case 0x6: 153 clock_freq = 1800000000; 154 break; 155 case 0xd: 156 clock_freq = 1600000000; 157 break; 158 case 0x14: 159 clock_freq = 1333000000; 160 break; 161 default: 162 device_printf(dev, "Cannot guess clock freq with reg %x\n", 163 reg & 0x1f); 164 return (ENXIO); 165 break; 166 }; 167 168 ap806_clk_cluster_0.freq = clock_freq; 169 ap806_clk_cluster_1.freq = clock_freq; 170 clkdom = clkdom_create(dev); 171 172 clknode_fixed_register(clkdom, &ap806_clk_cluster_0); 173 clknode_fixed_register(clkdom, &ap806_clk_cluster_1); 174 clknode_fixed_register(clkdom, &ap806_clk_fixed); 175 clknode_fixed_register(clkdom, &ap806_clk_mss); 176 clknode_fixed_register(clkdom, &ap806_clk_sdio); 177 178 clkdom_finit(clkdom); 179 180 if (bootverbose) 181 clkdom_dump(clkdom); 182 return (0); 183 } 184 185 static int 186 mv_ap806_clock_detach(device_t dev) 187 { 188 189 return (EBUSY); 190 } 191 192 static device_method_t mv_ap806_clock_methods[] = { 193 /* Device interface */ 194 DEVMETHOD(device_probe, mv_ap806_clock_probe), 195 DEVMETHOD(device_attach, mv_ap806_clock_attach), 196 DEVMETHOD(device_detach, mv_ap806_clock_detach), 197 198 DEVMETHOD_END 199 }; 200 201 static devclass_t mv_ap806_clock_devclass; 202 203 static driver_t mv_ap806_clock_driver = { 204 "mv_ap806_clock", 205 mv_ap806_clock_methods, 206 sizeof(struct mv_ap806_clock_softc), 207 }; 208 209 EARLY_DRIVER_MODULE(mv_ap806_clock, simplebus, mv_ap806_clock_driver, 210 mv_ap806_clock_devclass, 0, 0, BUS_PASS_RESOURCE + BUS_PASS_ORDER_LATE); 211