1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 28 #include <sys/param.h> 29 #include <sys/systm.h> 30 #include <sys/bus.h> 31 32 #include <sys/kernel.h> 33 #include <sys/module.h> 34 #include <sys/rman.h> 35 #include <sys/lock.h> 36 #include <sys/mutex.h> 37 38 #include <machine/bus.h> 39 #include <machine/resource.h> 40 #include <machine/intr.h> 41 42 #include <dev/clk/clk_fixed.h> 43 #include <dev/syscon/syscon.h> 44 45 #include <dev/ofw/ofw_bus.h> 46 #include <dev/ofw/ofw_bus_subr.h> 47 48 #include "syscon_if.h" 49 50 static struct clk_fixed_def ap806_clk_cluster_0 = { 51 .clkdef.id = 0, 52 .clkdef.name = "ap806-cpu-cluster-0", 53 .freq = 0, 54 }; 55 56 static struct clk_fixed_def ap806_clk_cluster_1 = { 57 .clkdef.id = 1, 58 .clkdef.name = "ap806-cpu-cluster-1", 59 .freq = 0, 60 }; 61 62 static struct clk_fixed_def ap806_clk_fixed = { 63 .clkdef.id = 2, 64 .clkdef.name = "ap806-fixed", 65 .freq = 1200000000, 66 }; 67 68 /* Thoses are the only exported clocks AFAICT */ 69 70 static const char *mss_parents[] = {"ap806-fixed"}; 71 static struct clk_fixed_def ap806_clk_mss = { 72 .clkdef.id = 3, 73 .clkdef.name = "ap806-mss", 74 .clkdef.parent_names = mss_parents, 75 .clkdef.parent_cnt = 1, 76 .mult = 1, 77 .div = 6, 78 }; 79 80 static const char *sdio_parents[] = {"ap806-fixed"}; 81 static struct clk_fixed_def ap806_clk_sdio = { 82 .clkdef.id = 4, 83 .clkdef.name = "ap806-sdio", 84 .clkdef.parent_names = sdio_parents, 85 .clkdef.parent_cnt = 1, 86 .mult = 1, 87 .div = 3, 88 }; 89 90 struct mv_ap806_clock_softc { 91 device_t dev; 92 struct syscon *syscon; 93 }; 94 95 static struct ofw_compat_data compat_data[] = { 96 {"marvell,ap806-clock", 1}, 97 {NULL, 0} 98 }; 99 100 #define RD4(sc, reg) SYSCON_READ_4((sc)->syscon, (reg)) 101 #define WR4(sc, reg, val) SYSCON_WRITE_4((sc)->syscon, (reg), (val)) 102 103 static int 104 mv_ap806_clock_probe(device_t dev) 105 { 106 107 if (!ofw_bus_status_okay(dev)) 108 return (ENXIO); 109 110 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 111 return (ENXIO); 112 113 device_set_desc(dev, "Marvell AP806 Clock Controller"); 114 return (BUS_PROBE_DEFAULT); 115 } 116 117 static int 118 mv_ap806_clock_attach(device_t dev) 119 { 120 struct mv_ap806_clock_softc *sc; 121 struct clkdom *clkdom; 122 uint64_t clock_freq; 123 uint32_t reg; 124 125 sc = device_get_softc(dev); 126 sc->dev = dev; 127 128 if (SYSCON_GET_HANDLE(sc->dev, &sc->syscon) != 0 || 129 sc->syscon == NULL) { 130 device_printf(dev, "cannot get syscon for device\n"); 131 return (ENXIO); 132 } 133 134 reg = RD4(sc, 0x400); 135 switch (reg & 0x1f) { 136 case 0x0: 137 case 0x1: 138 clock_freq = 2000000000; 139 break; 140 case 0x4: 141 clock_freq = 1600000000; 142 break; 143 case 0x6: 144 clock_freq = 1800000000; 145 break; 146 case 0x7: 147 clock_freq = 1800000000; 148 break; 149 case 0xb: 150 clock_freq = 1600000000; 151 break; 152 case 0xd: 153 clock_freq = 1600000000; 154 break; 155 case 0x13: 156 clock_freq = 1000000000; 157 break; 158 case 0x14: 159 clock_freq = 1333000000; 160 break; 161 case 0x17: 162 clock_freq = 1333000000; 163 break; 164 case 0x19: 165 clock_freq = 1200000000; 166 break; 167 case 0x1a: 168 clock_freq = 1400000000; 169 break; 170 case 0x1b: 171 clock_freq = 600000000; 172 break; 173 case 0x1c: 174 clock_freq = 800000000; 175 break; 176 case 0x1d: 177 clock_freq = 1000000000; 178 break; 179 default: 180 device_printf(dev, "Cannot guess clock freq with reg %x\n", 181 reg & 0x1f); 182 return (ENXIO); 183 break; 184 }; 185 186 ap806_clk_cluster_0.freq = clock_freq; 187 ap806_clk_cluster_1.freq = clock_freq; 188 clkdom = clkdom_create(dev); 189 190 clknode_fixed_register(clkdom, &ap806_clk_cluster_0); 191 clknode_fixed_register(clkdom, &ap806_clk_cluster_1); 192 clknode_fixed_register(clkdom, &ap806_clk_fixed); 193 clknode_fixed_register(clkdom, &ap806_clk_mss); 194 clknode_fixed_register(clkdom, &ap806_clk_sdio); 195 196 clkdom_finit(clkdom); 197 198 if (bootverbose) 199 clkdom_dump(clkdom); 200 return (0); 201 } 202 203 static int 204 mv_ap806_clock_detach(device_t dev) 205 { 206 207 return (EBUSY); 208 } 209 210 static device_method_t mv_ap806_clock_methods[] = { 211 /* Device interface */ 212 DEVMETHOD(device_probe, mv_ap806_clock_probe), 213 DEVMETHOD(device_attach, mv_ap806_clock_attach), 214 DEVMETHOD(device_detach, mv_ap806_clock_detach), 215 216 DEVMETHOD_END 217 }; 218 219 static driver_t mv_ap806_clock_driver = { 220 "mv_ap806_clock", 221 mv_ap806_clock_methods, 222 sizeof(struct mv_ap806_clock_softc), 223 }; 224 225 EARLY_DRIVER_MODULE(mv_ap806_clock, simplebus, mv_ap806_clock_driver, 0, 0, 226 BUS_PASS_RESOURCE + BUS_PASS_ORDER_LATE); 227