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[src/trunk]: src/sys/dev/fdt add fdt pwm regulator



details:   https://anonhg.NetBSD.org/src/rev/8617495e5f6e
branches:  trunk
changeset: 958308:8617495e5f6e
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 99ced2dcdba2 -r 8617495e5f6e 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 99ced2dcdba2 -r 8617495e5f6e 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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