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/cdefs.h> 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/bus.h> 34 #include <sys/pcpu.h> 35 #include <sys/proc.h> 36 #include <sys/smp.h> 37 38 #include <dev/ofw/openfirm.h> 39 40 #include <machine/platform.h> 41 #include <machine/platformvar.h> 42 43 #include "platform_if.h" 44 45 extern uint32_t *bootinfo; 46 47 static int bare_probe(platform_t); 48 static void bare_mem_regions(platform_t, struct mem_region *phys, int *physsz, 49 struct mem_region *avail, int *availsz); 50 static u_long bare_timebase_freq(platform_t, struct cpuref *cpuref); 51 52 static void bare_reset(platform_t); 53 54 static platform_method_t bare_methods[] = { 55 PLATFORMMETHOD(platform_probe, bare_probe), 56 PLATFORMMETHOD(platform_mem_regions, bare_mem_regions), 57 PLATFORMMETHOD(platform_timebase_freq, bare_timebase_freq), 58 59 PLATFORMMETHOD(platform_reset, bare_reset), 60 61 PLATFORMMETHOD_END 62 }; 63 64 static platform_def_t bare_platform = { 65 "bare", 66 bare_methods, 67 0 68 }; 69 70 PLATFORM_DEF(bare_platform); 71 72 static int 73 bare_probe(platform_t plat) 74 { 75 76 if (OF_peer(0) == -1) /* Needs device tree to work */ 77 return (ENXIO); 78 79 return (BUS_PROBE_GENERIC); 80 } 81 82 void 83 bare_mem_regions(platform_t plat, struct mem_region *phys, int *physsz, 84 struct mem_region *avail, int *availsz) 85 { 86 87 ofw_mem_regions(phys, physsz, avail, availsz); 88 } 89 90 static u_long 91 bare_timebase_freq(platform_t plat, struct cpuref *cpuref) 92 { 93 u_long ticks; 94 phandle_t cpus, child; 95 pcell_t freq; 96 97 if (bootinfo != NULL) { 98 if (bootinfo[0] == 1) { 99 /* Backward compatibility. See 8-STABLE. */ 100 ticks = bootinfo[3] >> 3; 101 } else { 102 /* Compatibility with Juniper's loader. */ 103 ticks = bootinfo[5] >> 3; 104 } 105 } else 106 ticks = 0; 107 108 if ((cpus = OF_finddevice("/cpus")) == -1) 109 goto out; 110 111 if ((child = OF_child(cpus)) == 0) 112 goto out; 113 114 switch (OF_getproplen(child, "timebase-frequency")) { 115 case 4: 116 { 117 uint32_t tbase; 118 OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase)); 119 ticks = tbase; 120 return (ticks); 121 } 122 case 8: 123 { 124 uint64_t tbase; 125 OF_getprop(child, "timebase-frequency", &tbase, sizeof(tbase)); 126 ticks = tbase; 127 return (ticks); 128 } 129 default: 130 break; 131 } 132 133 freq = 0; 134 if (OF_getprop(child, "bus-frequency", (void *)&freq, 135 sizeof(freq)) <= 0) 136 goto out; 137 138 /* 139 * Time Base and Decrementer are updated every 8 CCB bus clocks. 140 * HID0[SEL_TBCLK] = 0 141 */ 142 if (freq != 0) 143 ticks = freq / 8; 144 145 out: 146 if (ticks <= 0) 147 panic("Unable to determine timebase frequency!"); 148 149 return (ticks); 150 } 151 152 static void 153 bare_reset(platform_t plat) 154 { 155 156 printf("Reset failed...\n"); 157 while (1) 158 ; 159 } 160