tegra_cpufreq.c revision 1.5.10.2
1 1.5.10.2 jdolecek /* $NetBSD: tegra_cpufreq.c,v 1.5.10.2 2017/12/03 11:35:54 jdolecek Exp $ */ 2 1.5.10.2 jdolecek 3 1.5.10.2 jdolecek /*- 4 1.5.10.2 jdolecek * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca> 5 1.5.10.2 jdolecek * All rights reserved. 6 1.5.10.2 jdolecek * 7 1.5.10.2 jdolecek * Redistribution and use in source and binary forms, with or without 8 1.5.10.2 jdolecek * modification, are permitted provided that the following conditions 9 1.5.10.2 jdolecek * are met: 10 1.5.10.2 jdolecek * 1. Redistributions of source code must retain the above copyright 11 1.5.10.2 jdolecek * notice, this list of conditions and the following disclaimer. 12 1.5.10.2 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 13 1.5.10.2 jdolecek * notice, this list of conditions and the following disclaimer in the 14 1.5.10.2 jdolecek * documentation and/or other materials provided with the distribution. 15 1.5.10.2 jdolecek * 16 1.5.10.2 jdolecek * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.5.10.2 jdolecek * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.5.10.2 jdolecek * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.5.10.2 jdolecek * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.5.10.2 jdolecek * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 1.5.10.2 jdolecek * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 1.5.10.2 jdolecek * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 1.5.10.2 jdolecek * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 1.5.10.2 jdolecek * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.5.10.2 jdolecek * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.5.10.2 jdolecek * SUCH DAMAGE. 27 1.5.10.2 jdolecek */ 28 1.5.10.2 jdolecek 29 1.5.10.2 jdolecek #include "locators.h" 30 1.5.10.2 jdolecek 31 1.5.10.2 jdolecek #include <sys/cdefs.h> 32 1.5.10.2 jdolecek __KERNEL_RCSID(0, "$NetBSD: tegra_cpufreq.c,v 1.5.10.2 2017/12/03 11:35:54 jdolecek Exp $"); 33 1.5.10.2 jdolecek 34 1.5.10.2 jdolecek #include <sys/param.h> 35 1.5.10.2 jdolecek #include <sys/bus.h> 36 1.5.10.2 jdolecek #include <sys/device.h> 37 1.5.10.2 jdolecek #include <sys/intr.h> 38 1.5.10.2 jdolecek #include <sys/systm.h> 39 1.5.10.2 jdolecek #include <sys/kernel.h> 40 1.5.10.2 jdolecek #include <sys/atomic.h> 41 1.5.10.2 jdolecek #include <sys/kmem.h> 42 1.5.10.2 jdolecek #include <sys/sysctl.h> 43 1.5.10.2 jdolecek 44 1.5.10.2 jdolecek #include <arm/nvidia/tegra_var.h> 45 1.5.10.2 jdolecek 46 1.5.10.2 jdolecek static u_int cpufreq_busy; 47 1.5.10.2 jdolecek static struct sysctllog *cpufreq_log; 48 1.5.10.2 jdolecek static int cpufreq_node_target, cpufreq_node_current, cpufreq_node_available; 49 1.5.10.2 jdolecek 50 1.5.10.2 jdolecek static const struct tegra_cpufreq_func *cpufreq_func = NULL; 51 1.5.10.2 jdolecek 52 1.5.10.2 jdolecek static int tegra_cpufreq_freq_helper(SYSCTLFN_PROTO); 53 1.5.10.2 jdolecek static char tegra_cpufreq_available[TEGRA_CPUFREQ_MAX * 5]; 54 1.5.10.2 jdolecek 55 1.5.10.2 jdolecek #define cpufreq_set_rate cpufreq_func->set_rate 56 1.5.10.2 jdolecek #define cpufreq_get_rate cpufreq_func->get_rate 57 1.5.10.2 jdolecek #define cpufreq_get_available cpufreq_func->get_available 58 1.5.10.2 jdolecek 59 1.5.10.2 jdolecek void 60 1.5.10.2 jdolecek tegra_cpufreq_register(const struct tegra_cpufreq_func *cf) 61 1.5.10.2 jdolecek { 62 1.5.10.2 jdolecek const struct sysctlnode *node, *cpunode, *freqnode; 63 1.5.10.2 jdolecek u_int availfreq[TEGRA_CPUFREQ_MAX]; 64 1.5.10.2 jdolecek size_t nfreq; 65 1.5.10.2 jdolecek int error; 66 1.5.10.2 jdolecek 67 1.5.10.2 jdolecek KASSERT(cpufreq_func == NULL); 68 1.5.10.2 jdolecek cpufreq_func = cf; 69 1.5.10.2 jdolecek 70 1.5.10.2 jdolecek nfreq = cpufreq_get_available(availfreq, TEGRA_CPUFREQ_MAX); 71 1.5.10.2 jdolecek if (nfreq == 0) 72 1.5.10.2 jdolecek return; 73 1.5.10.2 jdolecek 74 1.5.10.2 jdolecek KASSERT(nfreq <= TEGRA_CPUFREQ_MAX); 75 1.5.10.2 jdolecek 76 1.5.10.2 jdolecek for (int i = 0; i < nfreq; i++) { 77 1.5.10.2 jdolecek char buf[6]; 78 1.5.10.2 jdolecek snprintf(buf, sizeof(buf), i ? " %u" : "%u", availfreq[i]); 79 1.5.10.2 jdolecek strcat(tegra_cpufreq_available, buf); 80 1.5.10.2 jdolecek } 81 1.5.10.2 jdolecek 82 1.5.10.2 jdolecek error = sysctl_createv(&cpufreq_log, 0, NULL, &node, 83 1.5.10.2 jdolecek CTLFLAG_PERMANENT, CTLTYPE_NODE, "machdep", NULL, 84 1.5.10.2 jdolecek NULL, 0, NULL, 0, CTL_MACHDEP, CTL_EOL); 85 1.5.10.2 jdolecek if (error) 86 1.5.10.2 jdolecek goto sysctl_failed; 87 1.5.10.2 jdolecek error = sysctl_createv(&cpufreq_log, 0, &node, &cpunode, 88 1.5.10.2 jdolecek 0, CTLTYPE_NODE, "cpu", NULL, 89 1.5.10.2 jdolecek NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL); 90 1.5.10.2 jdolecek if (error) 91 1.5.10.2 jdolecek goto sysctl_failed; 92 1.5.10.2 jdolecek error = sysctl_createv(&cpufreq_log, 0, &cpunode, &freqnode, 93 1.5.10.2 jdolecek 0, CTLTYPE_NODE, "frequency", NULL, 94 1.5.10.2 jdolecek NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL); 95 1.5.10.2 jdolecek if (error) 96 1.5.10.2 jdolecek goto sysctl_failed; 97 1.5.10.2 jdolecek 98 1.5.10.2 jdolecek error = sysctl_createv(&cpufreq_log, 0, &freqnode, &node, 99 1.5.10.2 jdolecek CTLFLAG_READWRITE, CTLTYPE_INT, "target", NULL, 100 1.5.10.2 jdolecek tegra_cpufreq_freq_helper, 0, NULL, 0, 101 1.5.10.2 jdolecek CTL_CREATE, CTL_EOL); 102 1.5.10.2 jdolecek if (error) 103 1.5.10.2 jdolecek goto sysctl_failed; 104 1.5.10.2 jdolecek cpufreq_node_target = node->sysctl_num; 105 1.5.10.2 jdolecek 106 1.5.10.2 jdolecek error = sysctl_createv(&cpufreq_log, 0, &freqnode, &node, 107 1.5.10.2 jdolecek CTLFLAG_READWRITE, CTLTYPE_INT, "current", NULL, 108 1.5.10.2 jdolecek tegra_cpufreq_freq_helper, 0, NULL, 0, 109 1.5.10.2 jdolecek CTL_CREATE, CTL_EOL); 110 1.5.10.2 jdolecek if (error) 111 1.5.10.2 jdolecek goto sysctl_failed; 112 1.5.10.2 jdolecek cpufreq_node_current = node->sysctl_num; 113 1.5.10.2 jdolecek 114 1.5.10.2 jdolecek error = sysctl_createv(&cpufreq_log, 0, &freqnode, &node, 115 1.5.10.2 jdolecek 0, CTLTYPE_STRING, "available", NULL, 116 1.5.10.2 jdolecek NULL, 0, tegra_cpufreq_available, 0, 117 1.5.10.2 jdolecek CTL_CREATE, CTL_EOL); 118 1.5.10.2 jdolecek if (error) 119 1.5.10.2 jdolecek goto sysctl_failed; 120 1.5.10.2 jdolecek cpufreq_node_available = node->sysctl_num; 121 1.5.10.2 jdolecek 122 1.5.10.2 jdolecek device_printf(curcpu()->ci_dev, 123 1.5.10.2 jdolecek "setting speed to %d MHz\n", availfreq[0]); 124 1.5.10.2 jdolecek cpufreq_set_rate(availfreq[0]); 125 1.5.10.2 jdolecek 126 1.5.10.2 jdolecek return; 127 1.5.10.2 jdolecek 128 1.5.10.2 jdolecek sysctl_failed: 129 1.5.10.2 jdolecek aprint_error("cpufreq: couldn't create sysctl nodes (%d)\n", error); 130 1.5.10.2 jdolecek sysctl_teardown(&cpufreq_log); 131 1.5.10.2 jdolecek } 132 1.5.10.2 jdolecek 133 1.5.10.2 jdolecek static int 134 1.5.10.2 jdolecek tegra_cpufreq_freq_helper(SYSCTLFN_ARGS) 135 1.5.10.2 jdolecek { 136 1.5.10.2 jdolecek struct sysctlnode node; 137 1.5.10.2 jdolecek int fq, oldfq = 0, error; 138 1.5.10.2 jdolecek 139 1.5.10.2 jdolecek node = *rnode; 140 1.5.10.2 jdolecek node.sysctl_data = &fq; 141 1.5.10.2 jdolecek 142 1.5.10.2 jdolecek fq = cpufreq_get_rate(); 143 1.5.10.2 jdolecek if (rnode->sysctl_num == cpufreq_node_target) 144 1.5.10.2 jdolecek oldfq = fq; 145 1.5.10.2 jdolecek 146 1.5.10.2 jdolecek error = sysctl_lookup(SYSCTLFN_CALL(&node)); 147 1.5.10.2 jdolecek if (error || newp == NULL) 148 1.5.10.2 jdolecek return error; 149 1.5.10.2 jdolecek 150 1.5.10.2 jdolecek if (fq == oldfq || rnode->sysctl_num != cpufreq_node_target) 151 1.5.10.2 jdolecek return 0; 152 1.5.10.2 jdolecek 153 1.5.10.2 jdolecek if (atomic_cas_uint(&cpufreq_busy, 0, 1) != 0) 154 1.5.10.2 jdolecek return EBUSY; 155 1.5.10.2 jdolecek 156 1.5.10.2 jdolecek error = cpufreq_set_rate(fq); 157 1.5.10.2 jdolecek if (error == 0) { 158 1.5.10.2 jdolecek pmf_event_inject(NULL, PMFE_SPEED_CHANGED); 159 1.5.10.2 jdolecek } 160 1.5.10.2 jdolecek 161 1.5.10.2 jdolecek atomic_dec_uint(&cpufreq_busy); 162 1.5.10.2 jdolecek 163 1.5.10.2 jdolecek return error; 164 1.5.10.2 jdolecek } 165
Indexes created Wed Oct 15 07:09:58 GMT 2025