1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 30 #include <sys/systm.h> 31 #include <sys/kernel.h> 32 #include <sys/bus.h> 33 #include <sys/pcpu.h> 34 #include <sys/proc.h> 35 #include <sys/smp.h> 36 37 #include <dev/ofw/openfirm.h> 38 39 #include <machine/platform.h> 40 #include <machine/platformvar.h> 41 42 #include "platform_if.h" 43 44 extern uint32_t *bootinfo; 45 46 static int bare_probe(platform_t); 47 static void bare_mem_regions(platform_t, struct mem_region *phys, int *physsz, 48 struct mem_region *avail, int *availsz); 49 static u_long bare_timebase_freq(platform_t, struct cpuref *cpuref); 50 51 static void bare_reset(platform_t); 52 53 static platform_method_t bare_methods[] = { 54 PLATFORMMETHOD(platform_probe, bare_probe), 55 PLATFORMMETHOD(platform_mem_regions, bare_mem_regions), 56 PLATFORMMETHOD(platform_timebase_freq, bare_timebase_freq), 57 58 PLATFORMMETHOD(platform_reset, bare_reset), 59 60 PLATFORMMETHOD_END 61 }; 62 63 static platform_def_t bare_platform = { 64 "bare", 65 bare_methods, 66 0 67 }; 68 69 PLATFORM_DEF(bare_platform); 70 71 static int 72 bare_probe(platform_t plat) 73 { 74 75 if (OF_peer(0) == -1) /* Needs device tree to work */ 76 return (ENXIO); 77 78 return (BUS_PROBE_GENERIC); 79 } 80 81 void 82 bare_mem_regions(platform_t plat, struct mem_region *phys, int *physsz, 83 struct mem_region *avail, int *availsz) 84 { 85 86 ofw_mem_regions(phys, physsz, avail, availsz); 87 } 88 89 static u_long 90 bare_timebase_freq(platform_t plat, struct cpuref *cpuref) 91 { 92 u_long ticks; 93 phandle_t cpus, child; 94 pcell_t freq; 95 96 if (bootinfo != NULL) { 97 if (bootinfo[0] == 1) { 98 /* Backward compatibility. See 8-STABLE. */ 99 ticks = bootinfo[3] >> 3; 100 } else { 101 /* Compatibility with Juniper's loader. */ 102 ticks = bootinfo[5] >> 3; 103 } 104 } else 105 ticks = 0; 106 107 if ((cpus = OF_finddevice("/cpus")) == -1) 108 goto out; 109 110 if ((child = OF_child(cpus)) == 0) 111 goto out; 112 113 switch (OF_getproplen(child, "timebase-frequency")) { 114 case 4: 115 { 116 uint32_t tbase; 117 OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase)); 118 ticks = tbase; 119 return (ticks); 120 } 121 case 8: 122 { 123 uint64_t tbase; 124 OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase)); 125 ticks = tbase; 126 return (ticks); 127 } 128 default: 129 break; 130 } 131 132 freq = 0; 133 if (OF_getprop(child, "bus-frequency", (void *)&freq, 134 sizeof(freq)) <= 0) 135 goto out; 136 137 /* 138 * Time Base and Decrementer are updated every 8 CCB bus clocks. 139 * HID0[SEL_TBCLK] = 0 140 */ 141 if (freq != 0) 142 ticks = freq / 8; 143 144 out: 145 if (ticks <= 0) 146 panic("Unable to determine timebase frequency!"); 147 148 return (ticks); 149 } 150 151 static void 152 bare_reset(platform_t plat) 153 { 154 155 printf("Reset failed...\n"); 156 while (1) 157 ; 158 } 159