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[src/trunk]: src/sys/dev/fdt Add GPIO regulator driver.
details: https://anonhg.NetBSD.org/src/rev/5aba2c6c4ef5
branches: trunk
changeset: 826070:5aba2c6c4ef5
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Sun Aug 13 18:27:31 2017 +0000
description:
Add GPIO regulator driver.
diffstat:
sys/dev/fdt/files.fdt | 6 +-
sys/dev/fdt/gpioregulator.c | 250 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 255 insertions(+), 1 deletions(-)
diffs (274 lines):
diff -r d85ea2f1c57c -r 5aba2c6c4ef5 sys/dev/fdt/files.fdt
--- a/sys/dev/fdt/files.fdt Sun Aug 13 18:27:11 2017 +0000
+++ b/sys/dev/fdt/files.fdt Sun Aug 13 18:27:31 2017 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.19 2017/07/08 12:37:08 jmcneill Exp $
+# $NetBSD: files.fdt,v 1.20 2017/08/13 18:27:31 jmcneill Exp $
include "external/bsd/libfdt/conf/files.libfdt"
@@ -14,6 +14,10 @@
attach fregulator at fdt
file dev/fdt/fixedregulator.c fregulator
+device gregulator
+attach gregulator at fdt
+file dev/fdt/gpioregulator.c gregulator
+
device fclock: clk
attach fclock at fdt
file dev/fdt/fixedclock.c fclock
diff -r d85ea2f1c57c -r 5aba2c6c4ef5 sys/dev/fdt/gpioregulator.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/fdt/gpioregulator.c Sun Aug 13 18:27:31 2017 +0000
@@ -0,0 +1,250 @@
+/* $NetBSD: gpioregulator.c,v 1.1 2017/08/13 18:27:31 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 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: gpioregulator.c,v 1.1 2017/08/13 18:27:31 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/kmem.h>
+#include <sys/bus.h>
+#include <sys/gpio.h>
+
+#include <dev/fdt/fdtvar.h>
+
+static int gpioregulator_match(device_t, cfdata_t, void *);
+static void gpioregulator_attach(device_t, device_t, void *);
+
+static int gpioregulator_acquire(device_t);
+static void gpioregulator_release(device_t);
+static int gpioregulator_enable(device_t, bool);
+static int gpioregulator_set_voltage(device_t, u_int, u_int);
+static int gpioregulator_get_voltage(device_t, u_int *);
+
+static const struct fdtbus_regulator_controller_func gpioregulator_funcs = {
+ .acquire = gpioregulator_acquire,
+ .release = gpioregulator_release,
+ .enable = gpioregulator_enable,
+ .set_voltage = gpioregulator_set_voltage,
+ .get_voltage = gpioregulator_get_voltage,
+};
+
+struct gpioregulator_state {
+ u_int st_val;
+ u_int st_mask;
+};
+
+struct gpioregulator_softc {
+ device_t sc_dev;
+ int sc_phandle;
+
+ struct fdtbus_gpio_pin *sc_pin_enable;
+
+ struct fdtbus_gpio_pin **sc_pins;
+ u_int sc_npins;
+
+ struct gpioregulator_state *sc_states;
+ u_int sc_nstates;
+
+ bool sc_always_on;
+ bool sc_boot_on;
+ bool sc_enable_val;
+ uint32_t sc_delay;
+
+ int sc_gpioflags;
+};
+
+CFATTACH_DECL_NEW(gregulator, sizeof(struct gpioregulator_softc),
+ gpioregulator_match, gpioregulator_attach, NULL, NULL);
+
+static int
+gpioregulator_match(device_t parent, cfdata_t cf, void *aux)
+{
+ const char * const compatible[] = { "regulator-gpio", NULL };
+ const struct fdt_attach_args *faa = aux;
+
+ return of_match_compatible(faa->faa_phandle, compatible);
+}
+
+static void
+gpioregulator_attach(device_t parent, device_t self, void *aux)
+{
+ struct gpioregulator_softc * const sc = device_private(self);
+ const struct fdt_attach_args *faa = aux;
+ const int phandle = faa->faa_phandle;
+ const uint32_t *pstates;
+ uint32_t mask;
+ char *name;
+ int len, n;
+
+ 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");
+ }
+
+ pstates = fdtbus_get_prop(phandle, "states", &len);
+ if (pstates == NULL || len < 8 || len % 8 != 0) {
+ aprint_error_dev(self, "invalid 'states' property\n");
+ return;
+ }
+
+ mask = 0;
+ sc->sc_nstates = len / (sizeof(uint32_t) * 2);
+ sc->sc_states = kmem_zalloc(
+ sc->sc_nstates * sizeof(struct gpioregulator_state), KM_SLEEP);
+ for (n = 0; n < sc->sc_nstates; n++) {
+ sc->sc_states[n].st_val = be32toh(pstates[n * 2 + 0]);
+ sc->sc_states[n].st_mask = be32toh(pstates[n * 2 + 1]);
+ mask |= sc->sc_states[n].st_mask;
+ }
+
+ sc->sc_gpioflags = GPIO_PIN_OUTPUT;
+ if (of_getprop_bool(phandle, "gpio-open-drain"))
+ sc->sc_gpioflags |= GPIO_PIN_OPENDRAIN;
+
+ sc->sc_always_on = of_getprop_bool(phandle, "regulator-always-on");
+ sc->sc_boot_on = of_getprop_bool(phandle, "regulator-boot-on");
+ sc->sc_enable_val = of_getprop_bool(phandle, "enable-active-high");
+ if (of_getprop_uint32(phandle, "startup-delay-us", &sc->sc_delay) != 0)
+ sc->sc_delay = 0;
+
+ /* "enable-gpio" property (optional) */
+ sc->sc_pin_enable = fdtbus_gpio_acquire(phandle, "enable-gpio",
+ sc->sc_gpioflags);
+
+ /* "gpios" property */
+ sc->sc_npins = 32 - __builtin_clz(mask);
+ sc->sc_pins = kmem_zalloc(sc->sc_npins * sizeof(sc->sc_pins), KM_SLEEP);
+ for (n = 0; n < sc->sc_npins; n++) {
+ sc->sc_pins[n] = fdtbus_gpio_acquire_index(phandle, "gpios",
+ n, sc->sc_gpioflags);
+ if (sc->sc_pins[n] == NULL) {
+ aprint_error_dev(self, "cannot get pin %d\n", n);
+ return;
+ }
+ }
+
+ fdtbus_register_regulator_controller(self, phandle,
+ &gpioregulator_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)
+ gpioregulator_enable(self, true);
+}
+
+static int
+gpioregulator_acquire(device_t dev)
+{
+ return 0;
+}
+
+static void
+gpioregulator_release(device_t dev)
+{
+}
+
+static int
+gpioregulator_enable(device_t dev, bool enable)
+{
+ struct gpioregulator_softc * const sc = device_private(dev);
+
+ if (enable) {
+ if (sc->sc_pin_enable != NULL)
+ fdtbus_gpio_write_raw(sc->sc_pin_enable, sc->sc_enable_val);
+ if (sc->sc_delay > 0)
+ delay(sc->sc_delay);
+ } else {
+ if (sc->sc_always_on)
+ return EIO;
+ fdtbus_gpio_write_raw(sc->sc_pin_enable, !sc->sc_enable_val);
+ }
+ return 0;
+}
+
+static int
+gpioregulator_set_voltage(device_t dev, u_int min_uvolt, u_int max_uvolt)
+{
+ struct gpioregulator_softc * const sc = device_private(dev);
+ const struct gpioregulator_state *state = NULL;
+ int n;
+
+ for (n = 0; n < sc->sc_nstates; n++)
+ if (sc->sc_states[n].st_val >= min_uvolt &&
+ sc->sc_states[n].st_val <= max_uvolt) {
+ state = &sc->sc_states[n];
+ break;
+ }
+ if (state == NULL)
+ return EINVAL;
+
+ for (n = 0; n < sc->sc_npins; n++)
+ fdtbus_gpio_write(sc->sc_pins[n], (state->st_mask >> n) & 1);
+
+ if (sc->sc_delay > 0)
+ delay(sc->sc_delay);
+
+ return 0;
+}
+
+static int
+gpioregulator_get_voltage(device_t dev, u_int *puvolt)
+{
+ struct gpioregulator_softc * const sc = device_private(dev);
+ uint32_t mask = 0;
+ int n, val;
+
+ for (n = 0; n < sc->sc_npins; n++) {
+ val = fdtbus_gpio_read(sc->sc_pins[n]);
+ mask |= (val << n);
+ }
+
+ for (n = 0; n < sc->sc_nstates; n++)
+ if (sc->sc_states[n].st_mask == mask) {
+ *puvolt = sc->sc_states[n].st_val;
+ return 0;
+ }
+
+ return EIO;
+}
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