tegra_cpufreq.c revision 1.1
1 /* $NetBSD: tegra_cpufreq.c,v 1.1 2015/05/13 11:06:13 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca> 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include "locators.h" 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: tegra_cpufreq.c,v 1.1 2015/05/13 11:06:13 jmcneill Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/bus.h> 36 #include <sys/device.h> 37 #include <sys/intr.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/atomic.h> 41 #include <sys/kmem.h> 42 #include <sys/xcall.h> 43 #include <sys/sysctl.h> 44 45 #include <arm/nvidia/tegra_var.h> 46 47 static u_int cpufreq_busy; 48 static struct sysctllog *cpufreq_log; 49 static int cpufreq_node_target, cpufreq_node_current, cpufreq_node_available; 50 51 static const struct tegra_cpufreq_func *cpufreq_func = NULL; 52 53 static void tegra_cpufreq_post(void *, void *); 54 static int tegra_cpufreq_freq_helper(SYSCTLFN_PROTO); 55 static char tegra_cpufreq_available[TEGRA_CPUFREQ_MAX * 5]; 56 57 #define cpufreq_set_rate cpufreq_func->set_rate 58 #define cpufreq_get_rate cpufreq_func->get_rate 59 #define cpufreq_get_available cpufreq_func->get_available 60 61 void 62 tegra_cpufreq_register(const struct tegra_cpufreq_func *cf) 63 { 64 KASSERT(cpufreq_func == NULL); 65 cpufreq_func = cf; 66 } 67 68 void 69 tegra_cpufreq_init(void) 70 { 71 const struct sysctlnode *node, *cpunode, *freqnode; 72 u_int availfreq[TEGRA_CPUFREQ_MAX]; 73 size_t nfreq; 74 int error; 75 76 if (cpufreq_func == NULL) 77 return; 78 79 nfreq = cpufreq_get_available(availfreq, TEGRA_CPUFREQ_MAX); 80 if (nfreq == 0) 81 return; 82 83 KASSERT(nfreq <= TEGRA_CPUFREQ_MAX); 84 85 for (int i = 0; i < nfreq; i++) { 86 char buf[6]; 87 snprintf(buf, sizeof(buf), i ? " %u" : "%u", availfreq[i]); 88 strcat(tegra_cpufreq_available, buf); 89 } 90 91 error = sysctl_createv(&cpufreq_log, 0, NULL, &node, 92 CTLFLAG_PERMANENT, CTLTYPE_NODE, "machdep", NULL, 93 NULL, 0, NULL, 0, CTL_MACHDEP, CTL_EOL); 94 if (error) 95 goto sysctl_failed; 96 error = sysctl_createv(&cpufreq_log, 0, &node, &cpunode, 97 0, CTLTYPE_NODE, "cpu", NULL, 98 NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL); 99 if (error) 100 goto sysctl_failed; 101 error = sysctl_createv(&cpufreq_log, 0, &cpunode, &freqnode, 102 0, CTLTYPE_NODE, "frequency", NULL, 103 NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL); 104 if (error) 105 goto sysctl_failed; 106 107 error = sysctl_createv(&cpufreq_log, 0, &freqnode, &node, 108 CTLFLAG_READWRITE, CTLTYPE_INT, "target", NULL, 109 tegra_cpufreq_freq_helper, 0, NULL, 0, 110 CTL_CREATE, CTL_EOL); 111 if (error) 112 goto sysctl_failed; 113 cpufreq_node_target = node->sysctl_num; 114 115 error = sysctl_createv(&cpufreq_log, 0, &freqnode, &node, 116 CTLFLAG_READWRITE, CTLTYPE_INT, "current", NULL, 117 tegra_cpufreq_freq_helper, 0, NULL, 0, 118 CTL_CREATE, CTL_EOL); 119 if (error) 120 goto sysctl_failed; 121 cpufreq_node_current = node->sysctl_num; 122 123 error = sysctl_createv(&cpufreq_log, 0, &freqnode, &node, 124 0, CTLTYPE_STRING, "available", NULL, 125 NULL, 0, tegra_cpufreq_available, 0, 126 CTL_CREATE, CTL_EOL); 127 if (error) 128 goto sysctl_failed; 129 cpufreq_node_available = node->sysctl_num; 130 131 #ifdef CPUFREQ_BOOT 132 cpufreq_set_rate(CPUFREQ_BOOT); 133 tegra_cpufreq_post(NULL, NULL); 134 #endif 135 136 return; 137 138 sysctl_failed: 139 aprint_error("cpufreq: couldn't create sysctl nodes (%d)\n", error); 140 sysctl_teardown(&cpufreq_log); 141 } 142 143 static void 144 tegra_cpufreq_post(void *arg1, void *arg2) 145 { 146 struct cpu_info *ci = curcpu(); 147 148 ci->ci_data.cpu_cc_freq = cpufreq_get_rate() * 1000000; 149 } 150 151 static int 152 tegra_cpufreq_freq_helper(SYSCTLFN_ARGS) 153 { 154 struct sysctlnode node; 155 int fq, oldfq = 0, error; 156 uint64_t xc; 157 158 node = *rnode; 159 node.sysctl_data = &fq; 160 161 fq = cpufreq_get_rate(); 162 if (rnode->sysctl_num == cpufreq_node_target) 163 oldfq = fq; 164 165 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 166 if (error || newp == NULL) 167 return error; 168 169 if (fq == oldfq || rnode->sysctl_num != cpufreq_node_target) 170 return 0; 171 172 if (atomic_cas_uint(&cpufreq_busy, 0, 1) != 0) 173 return EBUSY; 174 175 error = cpufreq_set_rate(fq); 176 if (error == 0) { 177 xc = xc_broadcast(0, tegra_cpufreq_post, NULL, NULL); 178 xc_wait(xc); 179 pmf_event_inject(NULL, PMFE_SPEED_CHANGED); 180 } 181 182 atomic_dec_uint(&cpufreq_busy); 183 184 return error; 185 } 186
Indexes created Tue Sep 23 14:10:03 GMT 2025