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[src/trunk]: src/sys Add generic DT cpu frequency and voltage scaling driver.
details: https://anonhg.NetBSD.org/src/rev/8fe9d0d99a58
branches: trunk
changeset: 826867:8fe9d0d99a58
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Mon Oct 02 22:49:38 2017 +0000
description:
Add generic DT cpu frequency and voltage scaling driver.
diffstat:
sys/arch/arm/fdt/files.fdt | 6 +-
sys/dev/fdt/cpufreq_dt.c | 315 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 320 insertions(+), 1 deletions(-)
diffs (truncated from 339 to 300 lines):
diff -r a1551f6f0e84 -r 8fe9d0d99a58 sys/arch/arm/fdt/files.fdt
--- a/sys/arch/arm/fdt/files.fdt Mon Oct 02 22:48:02 2017 +0000
+++ b/sys/arch/arm/fdt/files.fdt Mon Oct 02 22:49:38 2017 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.13 2017/08/26 15:05:48 jmcneill Exp $
+# $NetBSD: files.fdt,v 1.14 2017/10/02 22:49:38 jmcneill Exp $
include "dev/pckbport/files.pckbport"
@@ -9,6 +9,10 @@
attach cpu at cpus with cpu_fdt
file arch/arm/fdt/cpu_fdt.c cpu_fdt
+device cpufreqdt
+attach cpufreqdt at cpu with cpufreq_dt
+file dev/fdt/cpufreq_dt.c cpufreq_dt
+
device gtmr: mpcorebus
attach gtmr at fdt with gtmr_fdt
file arch/arm/fdt/gtmr_fdt.c gtmr_fdt
diff -r a1551f6f0e84 -r 8fe9d0d99a58 sys/dev/fdt/cpufreq_dt.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/fdt/cpufreq_dt.c Mon Oct 02 22:49:38 2017 +0000
@@ -0,0 +1,315 @@
+/* $NetBSD: cpufreq_dt.c,v 1.1 2017/10/02 22:49:38 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2015-2017 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: cpufreq_dt.c,v 1.1 2017/10/02 22:49:38 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/kmem.h>
+#include <sys/bus.h>
+#include <sys/atomic.h>
+#include <sys/xcall.h>
+#include <sys/sysctl.h>
+
+#include <dev/fdt/fdtvar.h>
+
+struct cpufreq_dt_opp {
+ u_int freq_khz;
+ u_int voltage_uv;
+};
+
+struct cpufreq_dt_softc {
+ device_t sc_dev;
+ int sc_phandle;
+ struct clk *sc_clk;
+ struct fdtbus_regulator *sc_supply;
+
+ struct cpufreq_dt_opp *sc_opp;
+ ssize_t sc_nopp;
+ int sc_latency;
+
+ u_int sc_busy;
+
+ char *sc_freq_available;
+ int sc_node_target;
+ int sc_node_current;
+ int sc_node_available;
+};
+
+static void
+cpufreq_dt_change_cb(void *arg1, void *arg2)
+{
+#if notyet
+ struct cpu_info *ci = curcpu();
+ ci->ci_data.cpu_cc_freq = cpufreq_get_rate() * 1000000;
+#endif
+}
+
+static int
+cpufreq_dt_set_rate(struct cpufreq_dt_softc *sc, u_int freq_khz)
+{
+ struct cpufreq_dt_opp *opp = NULL;
+ u_int old_rate, new_rate, old_uv, new_uv;
+ int error;
+ ssize_t n;
+
+ for (n = 0; n < sc->sc_nopp; n++)
+ if (sc->sc_opp[n].freq_khz == freq_khz) {
+ opp = &sc->sc_opp[n];
+ break;
+ }
+ if (opp == NULL)
+ return EINVAL;
+
+ old_rate = clk_get_rate(sc->sc_clk);
+ new_rate = freq_khz * 1000;
+
+ if (old_rate == new_rate)
+ return 0;
+
+ error = fdtbus_regulator_get_voltage(sc->sc_supply, &old_uv);
+ if (error != 0)
+ return error;
+ new_uv = opp->voltage_uv;
+
+ if (new_uv > old_uv) {
+ error = fdtbus_regulator_set_voltage(sc->sc_supply,
+ new_uv, new_uv);
+ if (error != 0)
+ return error;
+ }
+
+ error = clk_set_rate(sc->sc_clk, new_rate);
+ if (error != 0)
+ return error;
+
+ if (new_uv < old_uv) {
+ error = fdtbus_regulator_set_voltage(sc->sc_supply,
+ new_uv, new_uv);
+ if (error != 0)
+ return error;
+ }
+
+ return 0;
+}
+
+static int
+cpufreq_dt_sysctl_helper(SYSCTLFN_ARGS)
+{
+ struct cpufreq_dt_softc * const sc = rnode->sysctl_data;
+ struct sysctlnode node;
+ u_int fq, oldfq = 0;
+ uint64_t xc;
+ int error;
+
+ node = *rnode;
+ node.sysctl_data = &fq;
+
+ fq = clk_get_rate(sc->sc_clk) / 1000000;
+ if (rnode->sysctl_num == sc->sc_node_target)
+ oldfq = fq;
+
+ error = sysctl_lookup(SYSCTLFN_CALL(&node));
+ if (error || newp == NULL)
+ return error;
+
+ if (fq == oldfq || rnode->sysctl_num != sc->sc_node_target)
+ return 0;
+
+ if (atomic_cas_uint(&sc->sc_busy, 0, 1) != 0)
+ return EBUSY;
+
+ error = cpufreq_dt_set_rate(sc, fq * 1000);
+ if (error == 0) {
+ xc = xc_broadcast(0, cpufreq_dt_change_cb, sc, NULL);
+ xc_wait(xc);
+
+ pmf_event_inject(NULL, PMFE_SPEED_CHANGED);
+ }
+
+ atomic_dec_uint(&sc->sc_busy);
+
+ return error;
+}
+
+static void
+cpufreq_dt_init_sysctl(struct cpufreq_dt_softc *sc)
+{
+ const struct sysctlnode *node, *cpunode, *freqnode;
+ struct sysctllog *cpufreq_log = NULL;
+ int error, i;
+
+ sc->sc_freq_available = kmem_zalloc(strlen("XXXX ") * sc->sc_nopp, KM_SLEEP);
+ for (i = 0; i < sc->sc_nopp; i++) {
+ char buf[6];
+ snprintf(buf, sizeof(buf), i ? " %u" : "%u", sc->sc_opp[i].freq_khz / 1000);
+ strcat(sc->sc_freq_available, buf);
+ }
+
+ error = sysctl_createv(&cpufreq_log, 0, NULL, &node,
+ CTLFLAG_PERMANENT, CTLTYPE_NODE, "machdep", NULL,
+ NULL, 0, NULL, 0, CTL_MACHDEP, CTL_EOL);
+ if (error)
+ goto sysctl_failed;
+ error = sysctl_createv(&cpufreq_log, 0, &node, &cpunode,
+ 0, CTLTYPE_NODE, "cpu", NULL,
+ NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL);
+ if (error)
+ goto sysctl_failed;
+ error = sysctl_createv(&cpufreq_log, 0, &cpunode, &freqnode,
+ 0, CTLTYPE_NODE, "frequency", NULL,
+ NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL);
+ if (error)
+ goto sysctl_failed;
+
+ error = sysctl_createv(&cpufreq_log, 0, &freqnode, &node,
+ CTLFLAG_READWRITE, CTLTYPE_INT, "target", NULL,
+ cpufreq_dt_sysctl_helper, 0, (void *)sc, 0,
+ CTL_CREATE, CTL_EOL);
+ if (error)
+ goto sysctl_failed;
+ sc->sc_node_target = node->sysctl_num;
+
+ error = sysctl_createv(&cpufreq_log, 0, &freqnode, &node,
+ CTLFLAG_READWRITE, CTLTYPE_INT, "current", NULL,
+ cpufreq_dt_sysctl_helper, 0, (void *)sc, 0,
+ CTL_CREATE, CTL_EOL);
+ if (error)
+ goto sysctl_failed;
+ sc->sc_node_current = node->sysctl_num;
+
+ error = sysctl_createv(&cpufreq_log, 0, &freqnode, &node,
+ 0, CTLTYPE_STRING, "available", NULL,
+ NULL, 0, sc->sc_freq_available, 0,
+ CTL_CREATE, CTL_EOL);
+ if (error)
+ goto sysctl_failed;
+ sc->sc_node_available = node->sysctl_num;
+
+ return;
+
+sysctl_failed:
+ aprint_error_dev(sc->sc_dev, "couldn't create sysctl nodes: %d\n", error);
+ sysctl_teardown(&cpufreq_log);
+}
+
+static int
+cpufreq_dt_parse(struct cpufreq_dt_softc *sc)
+{
+ const int phandle = sc->sc_phandle;
+ const u_int *opp;
+ int len, i;
+ u_int lat;
+
+ sc->sc_supply = fdtbus_regulator_acquire(phandle, "cpu-supply");
+ if (sc->sc_supply == NULL) {
+ aprint_error_dev(sc->sc_dev, "couldn't acquire cpu-supply\n");
+ return ENXIO;
+ }
+ sc->sc_clk = fdtbus_clock_get_index(phandle, 0);
+ if (sc->sc_clk == NULL) {
+ aprint_error_dev(sc->sc_dev, "couldn't acquire clock\n");
+ return ENXIO;
+ }
+
+ opp = fdtbus_get_prop(phandle, "operating-points", &len);
+ if (len < 8)
+ return ENXIO;
+
+ sc->sc_nopp = len / 8;
+ sc->sc_opp = kmem_zalloc(sizeof(*sc->sc_opp) * sc->sc_nopp, KM_SLEEP);
+ for (i = 0; i < sc->sc_nopp; i++, opp += 2) {
+ sc->sc_opp[i].freq_khz = be32toh(opp[0]);
+ sc->sc_opp[i].voltage_uv = be32toh(opp[1]);
+
+ aprint_verbose_dev(sc->sc_dev, "%u.%03u MHz, %u uV\n",
+ sc->sc_opp[i].freq_khz / 1000,
+ sc->sc_opp[i].freq_khz % 1000,
+ sc->sc_opp[i].voltage_uv);
+ }
+
+ if (of_getprop_uint32(phandle, "clock-latency", &lat) == 0)
+ sc->sc_latency = lat;
+ else
+ sc->sc_latency = -1;
+
+ return 0;
+}
+
+static int
+cpufreq_dt_match(device_t parent, cfdata_t cf, void *aux)
+{
+ struct fdt_attach_args * const faa = aux;
+ const int phandle = faa->faa_phandle;
+ bus_addr_t addr;
+
+ if (fdtbus_get_reg(phandle, 0, &addr, NULL) != 0)
+ return 0;
+ /* Generic DT cpufreq driver properties must be defined under /cpus/cpu@0 */
+ if (addr != 0)
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