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[src/trunk]: src/sys/dev/fdt add fdt pwm regulator
details: https://anonhg.NetBSD.org/src/rev/f4f4eb5aadfb
branches: trunk
changeset: 948781:f4f4eb5aadfb
user: ryo <ryo%NetBSD.org@localhost>
date: Thu Dec 31 15:12:33 2020 +0000
description:
add fdt pwm regulator
diffstat:
sys/dev/fdt/files.fdt | 6 +-
sys/dev/fdt/pwmregulator.c | 309 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 314 insertions(+), 1 deletions(-)
diffs (truncated from 333 to 300 lines):
diff -r 9542b4d0202e -r f4f4eb5aadfb sys/dev/fdt/files.fdt
--- a/sys/dev/fdt/files.fdt Thu Dec 31 15:10:46 2020 +0000
+++ b/sys/dev/fdt/files.fdt Thu Dec 31 15:12:33 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.59 2020/12/28 20:29:57 thorpej Exp $
+# $NetBSD: files.fdt,v 1.60 2020/12/31 15:12:33 ryo Exp $
include "external/bsd/libfdt/conf/files.libfdt"
@@ -21,6 +21,10 @@
attach gregulator at fdt
file dev/fdt/gpioregulator.c gregulator
+device pregulator
+attach pregulator at fdt
+file dev/fdt/pwmregulator.c pregulator
+
device fclock: clk
attach fclock at fdt
file dev/fdt/fixedclock.c fclock
diff -r 9542b4d0202e -r f4f4eb5aadfb sys/dev/fdt/pwmregulator.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/fdt/pwmregulator.c Thu Dec 31 15:12:33 2020 +0000
@@ -0,0 +1,309 @@
+/* $NetBSD: pwmregulator.c,v 1.1 2020/12/31 15:12:33 ryo Exp $ */
+
+/*
+ * Copyright (c) 2020 Ryo Shimizu <ryo%nerv.org@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: pwmregulator.c,v 1.1 2020/12/31 15:12:33 ryo Exp $");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/kmem.h>
+
+#include <dev/fdt/fdtvar.h>
+#include <dev/pwm/pwmvar.h>
+
+static int pwmregulator_match(device_t, cfdata_t, void *);
+static void pwmregulator_attach(device_t, device_t, void *);
+
+/* fdtbus_regulator_controller_func callback */
+static int pwmregulator_acquire(device_t);
+static void pwmregulator_release(device_t);
+static int pwmregulator_enable(device_t, bool);
+static int pwmregulator_set_voltage(device_t, u_int, u_int);
+static int pwmregulator_get_voltage(device_t, u_int *);
+
+static const struct fdtbus_regulator_controller_func pwmregulator_funcs = {
+ .acquire = pwmregulator_acquire,
+ .release = pwmregulator_release,
+ .enable = pwmregulator_enable,
+ .set_voltage = pwmregulator_set_voltage,
+ .get_voltage = pwmregulator_get_voltage
+};
+
+struct voltage_duty {
+ uint32_t microvolt;
+ uint32_t duty; /* percentage; 0-100 */
+};
+
+struct pwmregulator_softc {
+ device_t sc_dev;
+ pwm_tag_t sc_pwm;
+ struct voltage_duty *sc_voltage_table;
+ int sc_voltage_table_num;
+ int sc_phandle;
+ uint32_t sc_microvolt_min;
+ uint32_t sc_microvolt_max;
+ uint32_t sc_dutycycle_unit;
+ uint32_t sc_dutycycle_range[2];
+ bool sc_always_on;
+ bool sc_boot_on;
+};
+
+CFATTACH_DECL_NEW(pregulator, sizeof(struct pwmregulator_softc),
+ pwmregulator_match, pwmregulator_attach, NULL, NULL);
+
+static const char * const compatible[] = {
+ "pwm-regulator",
+ NULL
+};
+
+static int
+pwmregulator_match(device_t parent, cfdata_t cf, void *aux)
+{
+ const struct fdt_attach_args *faa = aux;
+
+ return of_match_compatible(faa->faa_phandle, compatible);
+}
+
+static void
+pwmregulator_attach(device_t parent, device_t self, void *aux)
+{
+ struct pwmregulator_softc * const sc = device_private(self);
+ const struct fdt_attach_args *faa = aux;
+ const int phandle = faa->faa_phandle;
+ int len;
+ char *name;
+
+ sc->sc_dev = self;
+ sc->sc_phandle = phandle;
+
+ aprint_naive("\n");
+ len = OF_getproplen(phandle, "regulator-name");
+ if (len > 0) {
+ name = kmem_zalloc(len, KM_SLEEP);
+ if (OF_getprop(phandle, "regulator-name", name, len) == len)
+ aprint_normal(": %s\n", name);
+ else
+ aprint_normal("\n");
+ kmem_free(name, len);
+ } else {
+ aprint_normal("\n");
+ }
+
+ if (of_getprop_uint32(phandle, "regulator-min-microvolt",
+ &sc->sc_microvolt_min) != 0) {
+ aprint_error_dev(sc->sc_dev,
+ "missing regulator-min-microvolt properties\n");
+ return;
+ }
+ if (of_getprop_uint32(phandle, "regulator-max-microvolt",
+ &sc->sc_microvolt_max) != 0) {
+ aprint_error_dev(sc->sc_dev,
+ "missing regulator-max-microvolt properties\n");
+ return;
+ }
+
+ if (of_getprop_uint32(phandle, "pwm-dutycycle-unit",
+ &sc->sc_dutycycle_unit) != 0)
+ sc->sc_dutycycle_unit = 100;
+
+ len = of_getprop_uint32_array(phandle, "pwm-dutycycle-range",
+ sc->sc_dutycycle_range, 2);
+ if (of_getprop_uint32_array(phandle, "pwm-dutycycle-range",
+ sc->sc_dutycycle_range, 2) != 0) {
+ sc->sc_dutycycle_range[0] = 0;
+ sc->sc_dutycycle_range[1] = 100;
+ }
+
+ len = OF_getproplen(phandle, "voltage-table");
+ if (len > 0) {
+ struct voltage_duty *voltage_table = kmem_zalloc(len, KM_SLEEP);
+ if (of_getprop_uint32_array(phandle, "voltage-table",
+ (uint32_t *)voltage_table, len / sizeof(uint32_t)) == 0) {
+ sc->sc_voltage_table = voltage_table;
+ sc->sc_voltage_table_num =
+ len / sizeof(struct voltage_duty);
+#ifdef PWMREGULATOR_DEBUG
+ for (int i = 0; i < sc->sc_voltage_table_num; i++) {
+ aprint_debug_dev(sc->sc_dev,
+ "VoltageTable[%d]: %uuV = Duty:%u%%\n", i,
+ voltage_table[i].voltage,
+ voltage_table[i].duty);
+ }
+#endif
+ /*
+ * if voltage-table is provided, the duty in the table
+ * represents a percentage, i.e. 0-100%, so
+ * dutycycle_unit is 100.
+ */
+ sc->sc_dutycycle_unit = 100;
+ } else {
+ kmem_free(sc->sc_voltage_table, len);
+ }
+ }
+#ifdef PWMREGULATOR_DEBUG
+ if (sc->sc_voltage_table_num == 0) {
+ aprint_debug_dev(sc->sc_dev, "Duty:%u%%=%uuV, Duty:%u%%=%uuV\n",
+ sc->sc_dutycycle_range[0], sc->sc_microvolt_min,
+ sc->sc_dutycycle_range[1], sc->sc_microvolt_max);
+ }
+#endif
+
+ sc->sc_always_on = of_getprop_bool(phandle, "regulator-always-on");
+ sc->sc_boot_on = of_getprop_bool(phandle, "regulator-boot-on");
+
+ fdtbus_register_regulator_controller(self, phandle,
+ &pwmregulator_funcs);
+
+ /*
+ * If the regulator is flagged as always on or enabled at boot,
+ * ensure that it is enabled
+ */
+ if (sc->sc_always_on || sc->sc_boot_on)
+ pwmregulator_enable(self, true);
+}
+
+static int
+pwmregulator_acquire(device_t dev)
+{
+ struct pwmregulator_softc * const sc = device_private(dev);
+
+ sc->sc_pwm = fdtbus_pwm_acquire(sc->sc_phandle, "pwms");
+ if (sc->sc_pwm == NULL)
+ return ENXIO;
+
+ return 0;
+}
+
+static void
+pwmregulator_release(device_t dev)
+{
+ struct pwmregulator_softc * const sc = device_private(dev);
+
+ sc->sc_pwm = NULL;
+}
+
+static int
+pwmregulator_enable(device_t dev, bool enable)
+{
+ struct pwmregulator_softc * const sc = device_private(dev);
+
+ if (sc->sc_pwm == NULL)
+ return ENXIO;
+
+ if (enable)
+ return pwm_enable(sc->sc_pwm);
+ else
+ return pwm_disable(sc->sc_pwm);
+}
+
+static int
+pwmregulator_set_voltage(device_t dev, u_int min_uvolt, u_int max_uvolt)
+{
+ struct pwmregulator_softc * const sc = device_private(dev);
+ struct pwm_config conf;
+ int duty, d0, d1, v0, v1, uv, rc;
+
+ if (sc->sc_pwm == NULL)
+ return ENXIO;
+
+ rc = pwm_get_config(sc->sc_pwm, &conf);
+ if (rc != 0) {
+ device_printf(dev, "%s: couldn't get pwm config, error=%d\n",
+ __func__, rc);
+ return rc;
+ }
+
+ uv = (min_uvolt + max_uvolt) / 2;
+
+ if (sc->sc_voltage_table_num > 0) {
+ /* find the nearest duty from voltage-table */
+ int i, bestidx = 0;
+ for (i = 1; i < sc->sc_voltage_table_num; i++) {
+ if (abs(sc->sc_voltage_table[i].microvolt - uv) <
+ abs(sc->sc_voltage_table[bestidx].microvolt - uv))
+ bestidx = i;
+ }
+ duty = sc->sc_voltage_table[bestidx].duty;
+ } else {
+ /* calculate duty from voltage */
+ v0 = sc->sc_microvolt_min;
+ v1 = sc->sc_microvolt_max;
+ d0 = sc->sc_dutycycle_range[0];
+ d1 = sc->sc_dutycycle_range[1];
+ duty = (uv - v0) * (d1 - d0) / (v1 - v0) + d0;
+ }
+
+ conf.duty_cycle = duty * conf.period / sc->sc_dutycycle_unit;
+
+ rc = pwm_set_config(sc->sc_pwm, &conf);
+ if (rc != 0)
+ device_printf(dev, "couldn't set pwm config, error=%d\n", rc);
+ return rc;
+}
+
+static int
+pwmregulator_get_voltage(device_t dev, u_int *puvolt)
+{
+ struct pwmregulator_softc * const sc = device_private(dev);
+ struct pwm_config conf;
+ int duty, d0, d1, v0, v1, uv, rc;
+
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