cpu_speedctl.c revision 1.1
1 /* $NetBSD: cpu_speedctl.c,v 1.1 2018/06/01 18:06:58 macallan Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 Michael Lorenz 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 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: cpu_speedctl.c,v 1.1 2018/06/01 18:06:58 macallan Exp $"); 30 31 #include "opt_ppcparam.h" 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/device.h> 36 #include <sys/types.h> 37 38 #include <powerpc/psl.h> 39 #include <powerpc/spr.h> 40 #include <powerpc/oea/cpufeat.h> 41 #include <powerpc/oea/spr.h> 42 43 #include <sys/sysctl.h> 44 #include <dev/ofw/openfirm.h> 45 46 void init_scom_speedctl(void); 47 static int scom_speedctl = 0; 48 static uint32_t scom_speeds[2]; 49 static uint32_t scom_reg[2]; 50 static int sysctl_cpuspeed_temp(SYSCTLFN_ARGS); 51 static int sysctl_cpuspeed_cur(SYSCTLFN_ARGS); 52 static int sysctl_cpuspeed_available(SYSCTLFN_ARGS); 53 54 void 55 init_scom_speedctl(void) 56 { 57 int node; 58 const struct sysctlnode *sysctl_node, *me, *freq; 59 60 /* do this only once */ 61 if (scom_speedctl != 0) return; 62 scom_speedctl = 1; 63 64 node = OF_finddevice("/cpus/@0"); 65 if (OF_getprop(node, "power-mode-data", scom_reg, 8) != 8) 66 return; 67 if (OF_getprop(node, "clock-frequency", scom_speeds, 4) != 4) 68 return; 69 scom_speeds[0] = scom_speeds[0] / 1000000; /* Hz -> MHz */ 70 scom_speeds[1] = scom_speeds[0] / 2; 71 72 sysctl_node = NULL; 73 74 if (sysctl_createv(NULL, 0, NULL, 75 &me, 76 CTLFLAG_READWRITE, CTLTYPE_NODE, "cpu", NULL, NULL, 77 0, NULL, 0, CTL_MACHDEP, CTL_CREATE, CTL_EOL) != 0) 78 printf("couldn't create 'cpu' node\n"); 79 80 if (sysctl_createv(NULL, 0, NULL, 81 &freq, 82 CTLFLAG_READWRITE, CTLTYPE_NODE, "frequency", NULL, NULL, 83 0, NULL, 0, CTL_MACHDEP, me->sysctl_num, CTL_CREATE, CTL_EOL) != 0) 84 printf("couldn't create 'frequency' node\n"); 85 86 if (sysctl_createv(NULL, 0, NULL, 87 &sysctl_node, 88 CTLFLAG_READWRITE | CTLFLAG_OWNDESC, 89 CTLTYPE_INT, "target", "CPU speed", sysctl_cpuspeed_temp, 90 0, NULL, 0, CTL_MACHDEP, me->sysctl_num, freq->sysctl_num, 91 CTL_CREATE, CTL_EOL) == 0) { 92 } else 93 printf("couldn't create 'target' node\n"); 94 95 if (sysctl_createv(NULL, 0, NULL, 96 &sysctl_node, 97 CTLFLAG_READWRITE, 98 CTLTYPE_INT, "current", NULL, sysctl_cpuspeed_cur, 99 1, NULL, 0, CTL_MACHDEP, me->sysctl_num, freq->sysctl_num, 100 CTL_CREATE, CTL_EOL) == 0) { 101 } else 102 printf("couldn't create 'current' node\n"); 103 104 if (sysctl_createv(NULL, 0, NULL, 105 &sysctl_node, 106 CTLFLAG_READWRITE, 107 CTLTYPE_STRING, "available", NULL, sysctl_cpuspeed_available, 108 2, NULL, 0, CTL_MACHDEP, me->sysctl_num, freq->sysctl_num, 109 CTL_CREATE, CTL_EOL) == 0) { 110 } else 111 printf("couldn't create 'available' node\n"); 112 } 113 114 static int 115 sysctl_cpuspeed_temp(SYSCTLFN_ARGS) 116 { 117 struct sysctlnode node = *rnode; 118 int speed, nspeed = -1, mhz; 119 120 speed = (scom_read(SCOM_PSR) >> 56) & 3; 121 if (speed > 1) speed = 1; 122 mhz = scom_speeds[speed]; 123 node.sysctl_data = &mhz; 124 125 if (sysctl_lookup(SYSCTLFN_CALL(&node)) == 0) { 126 int new_reg; 127 128 new_reg = *(int *)node.sysctl_data; 129 if (new_reg == scom_speeds[0]) { 130 nspeed = 0; 131 } else if (new_reg == scom_speeds[1]) { 132 nspeed = 1; 133 } else { 134 printf("%s: new_reg %d\n", __func__, new_reg); 135 return EINVAL; 136 } 137 if (nspeed != speed) { 138 volatile uint64_t junk; 139 scom_write(SCOM_PCR, 0x80000000); 140 scom_write(SCOM_PCR, scom_reg[nspeed]); 141 junk = scom_read(SCOM_PSR); 142 __USE(junk); 143 } 144 return 0; 145 } 146 return EINVAL; 147 } 148 149 static int 150 sysctl_cpuspeed_cur(SYSCTLFN_ARGS) 151 { 152 struct sysctlnode node = *rnode; 153 uint64_t speed; 154 int mhz; 155 156 speed = (scom_read(SCOM_PSR) >> 56) & 3; 157 if (speed > 1) speed = 1; 158 159 mhz = scom_speeds[speed]; 160 node.sysctl_data = &mhz; 161 return sysctl_lookup(SYSCTLFN_CALL(&node)); 162 } 163 164 static int 165 sysctl_cpuspeed_available(SYSCTLFN_ARGS) 166 { 167 struct sysctlnode node = *rnode; 168 char buf[128]; 169 170 snprintf(buf, 128, "%d %d", scom_speeds[0], scom_speeds[1]); 171 node.sysctl_data = buf; 172 return(sysctl_lookup(SYSCTLFN_CALL(&node))); 173 } 174 175 SYSCTL_SETUP(sysctl_ams_setup, "sysctl obio subtree setup") 176 { 177 178 sysctl_createv(NULL, 0, NULL, NULL, 179 CTLFLAG_PERMANENT, 180 CTLTYPE_NODE, "machdep", NULL, 181 NULL, 0, NULL, 0, 182 CTL_MACHDEP, CTL_EOL); 183 } 184
Indexes created Wed Sep 24 05:09:52 GMT 2025