1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2008-2012 Semihalf. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/bus.h> 36 #include <sys/pcpu.h> 37 #include <sys/proc.h> 38 #include <sys/smp.h> 39 40 #include <dev/ofw/openfirm.h> 41 42 #include <machine/platform.h> 43 #include <machine/platformvar.h> 44 45 #include "platform_if.h" 46 47 extern uint32_t *bootinfo; 48 49 static int bare_probe(platform_t); 50 static void bare_mem_regions(platform_t, struct mem_region *phys, int *physsz, 51 struct mem_region *avail, int *availsz); 52 static u_long bare_timebase_freq(platform_t, struct cpuref *cpuref); 53 54 static void bare_reset(platform_t); 55 56 static platform_method_t bare_methods[] = { 57 PLATFORMMETHOD(platform_probe, bare_probe), 58 PLATFORMMETHOD(platform_mem_regions, bare_mem_regions), 59 PLATFORMMETHOD(platform_timebase_freq, bare_timebase_freq), 60 61 PLATFORMMETHOD(platform_reset, bare_reset), 62 63 PLATFORMMETHOD_END 64 }; 65 66 static platform_def_t bare_platform = { 67 "bare", 68 bare_methods, 69 0 70 }; 71 72 PLATFORM_DEF(bare_platform); 73 74 static int 75 bare_probe(platform_t plat) 76 { 77 78 if (OF_peer(0) == -1) /* Needs device tree to work */ 79 return (ENXIO); 80 81 return (BUS_PROBE_GENERIC); 82 } 83 84 void 85 bare_mem_regions(platform_t plat, struct mem_region *phys, int *physsz, 86 struct mem_region *avail, int *availsz) 87 { 88 89 ofw_mem_regions(phys, physsz, avail, availsz); 90 } 91 92 static u_long 93 bare_timebase_freq(platform_t plat, struct cpuref *cpuref) 94 { 95 u_long ticks; 96 phandle_t cpus, child; 97 pcell_t freq; 98 99 if (bootinfo != NULL) { 100 if (bootinfo[0] == 1) { 101 /* Backward compatibility. See 8-STABLE. */ 102 ticks = bootinfo[3] >> 3; 103 } else { 104 /* Compatibility with Juniper's loader. */ 105 ticks = bootinfo[5] >> 3; 106 } 107 } else 108 ticks = 0; 109 110 if ((cpus = OF_finddevice("/cpus")) == -1) 111 goto out; 112 113 if ((child = OF_child(cpus)) == 0) 114 goto out; 115 116 switch (OF_getproplen(child, "timebase-frequency")) { 117 case 4: 118 { 119 uint32_t tbase; 120 OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase)); 121 ticks = tbase; 122 return (ticks); 123 } 124 case 8: 125 { 126 uint64_t tbase; 127 OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase)); 128 ticks = tbase; 129 return (ticks); 130 } 131 default: 132 break; 133 } 134 135 freq = 0; 136 if (OF_getprop(child, "bus-frequency", (void *)&freq, 137 sizeof(freq)) <= 0) 138 goto out; 139 140 /* 141 * Time Base and Decrementer are updated every 8 CCB bus clocks. 142 * HID0[SEL_TBCLK] = 0 143 */ 144 if (freq != 0) 145 ticks = freq / 8; 146 147 out: 148 if (ticks <= 0) 149 panic("Unable to determine timebase frequency!"); 150 151 return (ticks); 152 } 153 154 static void 155 bare_reset(platform_t plat) 156 { 157 158 printf("Reset failed...\n"); 159 while (1) 160 ; 161 } 162