tegra_cpufreq.c revision 1.1.2.4
1 1.1.2.4 skrll /* $NetBSD: tegra_cpufreq.c,v 1.1.2.4 2016/12/05 10:54:50 skrll Exp $ */ 2 1.1.2.2 skrll 3 1.1.2.2 skrll /*- 4 1.1.2.2 skrll * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca> 5 1.1.2.2 skrll * All rights reserved. 6 1.1.2.2 skrll * 7 1.1.2.2 skrll * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 skrll * modification, are permitted provided that the following conditions 9 1.1.2.2 skrll * are met: 10 1.1.2.2 skrll * 1. Redistributions of source code must retain the above copyright 11 1.1.2.2 skrll * notice, this list of conditions and the following disclaimer. 12 1.1.2.2 skrll * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.2 skrll * notice, this list of conditions and the following disclaimer in the 14 1.1.2.2 skrll * documentation and/or other materials provided with the distribution. 15 1.1.2.2 skrll * 16 1.1.2.2 skrll * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.1.2.2 skrll * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.1.2.2 skrll * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.1.2.2 skrll * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.1.2.2 skrll * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 1.1.2.2 skrll * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 1.1.2.2 skrll * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 1.1.2.2 skrll * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 1.1.2.2 skrll * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.1.2.2 skrll * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.1.2.2 skrll * SUCH DAMAGE. 27 1.1.2.2 skrll */ 28 1.1.2.2 skrll 29 1.1.2.2 skrll #include "locators.h" 30 1.1.2.2 skrll 31 1.1.2.2 skrll #include <sys/cdefs.h> 32 1.1.2.4 skrll __KERNEL_RCSID(0, "$NetBSD: tegra_cpufreq.c,v 1.1.2.4 2016/12/05 10:54:50 skrll Exp $"); 33 1.1.2.2 skrll 34 1.1.2.2 skrll #include <sys/param.h> 35 1.1.2.2 skrll #include <sys/bus.h> 36 1.1.2.2 skrll #include <sys/device.h> 37 1.1.2.2 skrll #include <sys/intr.h> 38 1.1.2.2 skrll #include <sys/systm.h> 39 1.1.2.2 skrll #include <sys/kernel.h> 40 1.1.2.2 skrll #include <sys/atomic.h> 41 1.1.2.2 skrll #include <sys/kmem.h> 42 1.1.2.2 skrll #include <sys/sysctl.h> 43 1.1.2.2 skrll 44 1.1.2.2 skrll #include <arm/nvidia/tegra_var.h> 45 1.1.2.2 skrll 46 1.1.2.2 skrll static u_int cpufreq_busy; 47 1.1.2.2 skrll static struct sysctllog *cpufreq_log; 48 1.1.2.2 skrll static int cpufreq_node_target, cpufreq_node_current, cpufreq_node_available; 49 1.1.2.2 skrll 50 1.1.2.2 skrll static const struct tegra_cpufreq_func *cpufreq_func = NULL; 51 1.1.2.2 skrll 52 1.1.2.2 skrll static int tegra_cpufreq_freq_helper(SYSCTLFN_PROTO); 53 1.1.2.2 skrll static char tegra_cpufreq_available[TEGRA_CPUFREQ_MAX * 5]; 54 1.1.2.2 skrll 55 1.1.2.2 skrll #define cpufreq_set_rate cpufreq_func->set_rate 56 1.1.2.2 skrll #define cpufreq_get_rate cpufreq_func->get_rate 57 1.1.2.2 skrll #define cpufreq_get_available cpufreq_func->get_available 58 1.1.2.2 skrll 59 1.1.2.2 skrll void 60 1.1.2.2 skrll tegra_cpufreq_register(const struct tegra_cpufreq_func *cf) 61 1.1.2.2 skrll { 62 1.1.2.2 skrll KASSERT(cpufreq_func == NULL); 63 1.1.2.2 skrll cpufreq_func = cf; 64 1.1.2.2 skrll } 65 1.1.2.2 skrll 66 1.1.2.2 skrll void 67 1.1.2.2 skrll tegra_cpufreq_init(void) 68 1.1.2.2 skrll { 69 1.1.2.2 skrll const struct sysctlnode *node, *cpunode, *freqnode; 70 1.1.2.2 skrll u_int availfreq[TEGRA_CPUFREQ_MAX]; 71 1.1.2.2 skrll size_t nfreq; 72 1.1.2.2 skrll int error; 73 1.1.2.2 skrll 74 1.1.2.2 skrll if (cpufreq_func == NULL) 75 1.1.2.2 skrll return; 76 1.1.2.2 skrll 77 1.1.2.2 skrll nfreq = cpufreq_get_available(availfreq, TEGRA_CPUFREQ_MAX); 78 1.1.2.2 skrll if (nfreq == 0) 79 1.1.2.2 skrll return; 80 1.1.2.2 skrll 81 1.1.2.2 skrll KASSERT(nfreq <= TEGRA_CPUFREQ_MAX); 82 1.1.2.2 skrll 83 1.1.2.2 skrll for (int i = 0; i < nfreq; i++) { 84 1.1.2.2 skrll char buf[6]; 85 1.1.2.2 skrll snprintf(buf, sizeof(buf), i ? " %u" : "%u", availfreq[i]); 86 1.1.2.2 skrll strcat(tegra_cpufreq_available, buf); 87 1.1.2.2 skrll } 88 1.1.2.2 skrll 89 1.1.2.2 skrll error = sysctl_createv(&cpufreq_log, 0, NULL, &node, 90 1.1.2.2 skrll CTLFLAG_PERMANENT, CTLTYPE_NODE, "machdep", NULL, 91 1.1.2.2 skrll NULL, 0, NULL, 0, CTL_MACHDEP, CTL_EOL); 92 1.1.2.2 skrll if (error) 93 1.1.2.2 skrll goto sysctl_failed; 94 1.1.2.2 skrll error = sysctl_createv(&cpufreq_log, 0, &node, &cpunode, 95 1.1.2.2 skrll 0, CTLTYPE_NODE, "cpu", NULL, 96 1.1.2.2 skrll NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL); 97 1.1.2.2 skrll if (error) 98 1.1.2.2 skrll goto sysctl_failed; 99 1.1.2.2 skrll error = sysctl_createv(&cpufreq_log, 0, &cpunode, &freqnode, 100 1.1.2.2 skrll 0, CTLTYPE_NODE, "frequency", NULL, 101 1.1.2.2 skrll NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL); 102 1.1.2.2 skrll if (error) 103 1.1.2.2 skrll goto sysctl_failed; 104 1.1.2.2 skrll 105 1.1.2.2 skrll error = sysctl_createv(&cpufreq_log, 0, &freqnode, &node, 106 1.1.2.2 skrll CTLFLAG_READWRITE, CTLTYPE_INT, "target", NULL, 107 1.1.2.2 skrll tegra_cpufreq_freq_helper, 0, NULL, 0, 108 1.1.2.2 skrll CTL_CREATE, CTL_EOL); 109 1.1.2.2 skrll if (error) 110 1.1.2.2 skrll goto sysctl_failed; 111 1.1.2.2 skrll cpufreq_node_target = node->sysctl_num; 112 1.1.2.2 skrll 113 1.1.2.2 skrll error = sysctl_createv(&cpufreq_log, 0, &freqnode, &node, 114 1.1.2.2 skrll CTLFLAG_READWRITE, CTLTYPE_INT, "current", NULL, 115 1.1.2.2 skrll tegra_cpufreq_freq_helper, 0, NULL, 0, 116 1.1.2.2 skrll CTL_CREATE, CTL_EOL); 117 1.1.2.2 skrll if (error) 118 1.1.2.2 skrll goto sysctl_failed; 119 1.1.2.2 skrll cpufreq_node_current = node->sysctl_num; 120 1.1.2.2 skrll 121 1.1.2.2 skrll error = sysctl_createv(&cpufreq_log, 0, &freqnode, &node, 122 1.1.2.2 skrll 0, CTLTYPE_STRING, "available", NULL, 123 1.1.2.2 skrll NULL, 0, tegra_cpufreq_available, 0, 124 1.1.2.2 skrll CTL_CREATE, CTL_EOL); 125 1.1.2.2 skrll if (error) 126 1.1.2.2 skrll goto sysctl_failed; 127 1.1.2.2 skrll cpufreq_node_available = node->sysctl_num; 128 1.1.2.2 skrll 129 1.1.2.3 skrll device_printf(curcpu()->ci_dev, 130 1.1.2.3 skrll "setting speed to %d MHz\n", availfreq[0]); 131 1.1.2.3 skrll cpufreq_set_rate(availfreq[0]); 132 1.1.2.2 skrll 133 1.1.2.2 skrll return; 134 1.1.2.2 skrll 135 1.1.2.2 skrll sysctl_failed: 136 1.1.2.2 skrll aprint_error("cpufreq: couldn't create sysctl nodes (%d)\n", error); 137 1.1.2.2 skrll sysctl_teardown(&cpufreq_log); 138 1.1.2.2 skrll } 139 1.1.2.2 skrll 140 1.1.2.2 skrll static int 141 1.1.2.2 skrll tegra_cpufreq_freq_helper(SYSCTLFN_ARGS) 142 1.1.2.2 skrll { 143 1.1.2.2 skrll struct sysctlnode node; 144 1.1.2.2 skrll int fq, oldfq = 0, error; 145 1.1.2.2 skrll 146 1.1.2.2 skrll node = *rnode; 147 1.1.2.2 skrll node.sysctl_data = &fq; 148 1.1.2.2 skrll 149 1.1.2.2 skrll fq = cpufreq_get_rate(); 150 1.1.2.2 skrll if (rnode->sysctl_num == cpufreq_node_target) 151 1.1.2.2 skrll oldfq = fq; 152 1.1.2.2 skrll 153 1.1.2.2 skrll error = sysctl_lookup(SYSCTLFN_CALL(&node)); 154 1.1.2.2 skrll if (error || newp == NULL) 155 1.1.2.2 skrll return error; 156 1.1.2.2 skrll 157 1.1.2.2 skrll if (fq == oldfq || rnode->sysctl_num != cpufreq_node_target) 158 1.1.2.2 skrll return 0; 159 1.1.2.2 skrll 160 1.1.2.2 skrll if (atomic_cas_uint(&cpufreq_busy, 0, 1) != 0) 161 1.1.2.2 skrll return EBUSY; 162 1.1.2.2 skrll 163 1.1.2.2 skrll error = cpufreq_set_rate(fq); 164 1.1.2.2 skrll if (error == 0) { 165 1.1.2.2 skrll pmf_event_inject(NULL, PMFE_SPEED_CHANGED); 166 1.1.2.2 skrll } 167 1.1.2.2 skrll 168 1.1.2.2 skrll atomic_dec_uint(&cpufreq_busy); 169 1.1.2.2 skrll 170 1.1.2.2 skrll return error; 171 1.1.2.2 skrll } 172
Indexes created Mon Oct 13 00:09:54 GMT 2025