Author: jmcneill
Date: Mon Sep 5 13:39:54 2016
New Revision: 305418
URL: https://svnweb.freebsd.org/changeset/base/305418
Log:
Add driver for Silergy Corp. SY8106A buck regulator.
Added:
head/sys/dev/iicbus/sy8106a.c (contents, props changed)
Added: head/sys/dev/iicbus/sy8106a.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/dev/iicbus/sy8106a.c Mon Sep 5 13:39:54 2016
(r305418)
@@ -0,0 +1,302 @@
+/*-
+ * Copyright (c) 2016 Jared McNeill <jmcne...@invisible.ca>
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * Silergy Corp. SY8106A buck regulator
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/rman.h>
+#include <sys/kernel.h>
+#include <sys/reboot.h>
+#include <sys/module.h>
+
+#include <dev/iicbus/iicbus.h>
+#include <dev/iicbus/iiconf.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <dev/extres/regulator/regulator.h>
+
+#include "iicbus_if.h"
+#include "regdev_if.h"
+
+#define VOUT1_SEL 0x01
+#define SEL_GO (1 << 7)
+#define SEL_VOLTAGE_MASK 0x7f
+#define SEL_VOLTAGE_BASE 680000 /* uV */
+#define SEL_VOLTAGE_STEP 10000 /* uV */
+#define VOUT_COM 0x02
+#define COM_DISABLE (1 << 0)
+#define SYS_STATUS 0x06
+
+static struct ofw_compat_data compat_data[] = {
+ { "silergy,sy8106a", 1 },
+ { NULL, 0 }
+};
+
+struct sy8106a_reg_sc {
+ struct regnode *regnode;
+ device_t base_dev;
+ phandle_t xref;
+ struct regnode_std_param *param;
+};
+
+struct sy8106a_softc {
+ uint16_t addr;
+
+ /* Regulator */
+ struct sy8106a_reg_sc *reg;
+};
+
+static int
+sy8106a_read(device_t dev, uint8_t reg, uint8_t *data, uint8_t size)
+{
+ struct sy8106a_softc *sc;
+ struct iic_msg msg[2];
+
+ sc = device_get_softc(dev);
+
+ msg[0].slave = sc->addr;
+ msg[0].flags = IIC_M_WR;
+ msg[0].len = 1;
+ msg[0].buf = ®
+
+ msg[1].slave = sc->addr;
+ msg[1].flags = IIC_M_RD;
+ msg[1].len = size;
+ msg[1].buf = data;
+
+ return (iicbus_transfer(dev, msg, 2));
+}
+
+static int
+sy8106a_write(device_t dev, uint8_t reg, uint8_t val)
+{
+ struct sy8106a_softc *sc;
+ struct iic_msg msg;
+ uint8_t buffer[2];
+
+ sc = device_get_softc(dev);
+
+ buffer[0] = reg;
+ buffer[1] = val;
+
+ msg.slave = sc->addr;
+ msg.flags = IIC_M_WR;
+ msg.len = 2;
+ msg.buf = buffer;
+
+ return (iicbus_transfer(dev, &msg, 1));
+}
+
+static int
+sy8106a_regnode_init(struct regnode *regnode)
+{
+ return (0);
+}
+
+static int
+sy8106a_regnode_enable(struct regnode *regnode, bool enable, int *udelay)
+{
+ struct sy8106a_reg_sc *sc;
+ uint8_t val;
+
+ sc = regnode_get_softc(regnode);
+
+ sy8106a_read(sc->base_dev, VOUT_COM, &val, 1);
+ if (enable)
+ val &= ~COM_DISABLE;
+ else
+ val |= COM_DISABLE;
+ sy8106a_write(sc->base_dev, VOUT_COM, val);
+
+ *udelay = sc->param->ramp_delay;
+
+ return (0);
+}
+
+static int
+sy8106a_regnode_set_voltage(struct regnode *regnode, int min_uvolt,
+ int max_uvolt, int *udelay)
+{
+ struct sy8106a_reg_sc *sc;
+ int cur_uvolt;
+ uint8_t val, oval;
+
+ sc = regnode_get_softc(regnode);
+
+ /* Get current voltage */
+ sy8106a_read(sc->base_dev, VOUT1_SEL, &oval, 1);
+ cur_uvolt = (oval & SEL_VOLTAGE_MASK) * SEL_VOLTAGE_STEP +
+ SEL_VOLTAGE_BASE;
+
+ /* Set new voltage */
+ val = SEL_GO | ((min_uvolt - SEL_VOLTAGE_BASE) / SEL_VOLTAGE_STEP);
+ sy8106a_write(sc->base_dev, VOUT1_SEL, val);
+
+ /* Time to delay is based on the number of voltage steps */
+ *udelay = sc->param->ramp_delay *
+ (abs(cur_uvolt - min_uvolt) / SEL_VOLTAGE_STEP);
+
+ return (0);
+}
+
+static int
+sy8106a_regnode_get_voltage(struct regnode *regnode, int *uvolt)
+{
+ struct sy8106a_reg_sc *sc;
+ uint8_t val;
+
+ sc = regnode_get_softc(regnode);
+
+ sy8106a_read(sc->base_dev, VOUT1_SEL, &val, 1);
+ *uvolt = (val & SEL_VOLTAGE_MASK) * SEL_VOLTAGE_STEP +
+ SEL_VOLTAGE_BASE;
+
+ return (0);
+}
+
+static regnode_method_t sy8106a_regnode_methods[] = {
+ /* Regulator interface */
+ REGNODEMETHOD(regnode_init, sy8106a_regnode_init),
+ REGNODEMETHOD(regnode_enable, sy8106a_regnode_enable),
+ REGNODEMETHOD(regnode_set_voltage, sy8106a_regnode_set_voltage),
+ REGNODEMETHOD(regnode_get_voltage, sy8106a_regnode_get_voltage),
+ REGNODEMETHOD_END
+};
+DEFINE_CLASS_1(sy8106a_regnode, sy8106a_regnode_class, sy8106a_regnode_methods,
+ sizeof(struct sy8106a_reg_sc), regnode_class);
+
+static struct sy8106a_reg_sc *
+sy8106a_reg_attach(device_t dev, phandle_t node)
+{
+ struct sy8106a_reg_sc *reg_sc;
+ struct regnode_init_def initdef;
+ struct regnode *regnode;
+
+ memset(&initdef, 0, sizeof(initdef));
+ regulator_parse_ofw_stdparam(dev, node, &initdef);
+ initdef.id = 0;
+ initdef.ofw_node = node;
+ regnode = regnode_create(dev, &sy8106a_regnode_class, &initdef);
+ if (regnode == NULL) {
+ device_printf(dev, "cannot create regulator\n");
+ return (NULL);
+ }
+
+ reg_sc = regnode_get_softc(regnode);
+ reg_sc->regnode = regnode;
+ reg_sc->base_dev = dev;
+ reg_sc->xref = OF_xref_from_node(node);
+ reg_sc->param = regnode_get_stdparam(regnode);
+
+ regnode_register(regnode);
+
+ return (reg_sc);
+}
+
+static int
+sy8106a_regdev_map(device_t dev, phandle_t xref, int ncells, pcell_t *cells,
+ intptr_t *num)
+{
+ struct sy8106a_softc *sc;
+
+ sc = device_get_softc(dev);
+
+ if (sc->reg->xref != xref)
+ return (ENXIO);
+
+ *num = 0;
+
+ return (0);
+}
+
+static int
+sy8106a_probe(device_t dev)
+{
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
+ return (ENXIO);
+
+ device_set_desc(dev, "Silergy SY8106A regulator");
+
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+sy8106a_attach(device_t dev)
+{
+ struct sy8106a_softc *sc;
+ phandle_t node;
+
+ sc = device_get_softc(dev);
+ node = ofw_bus_get_node(dev);
+
+ sc->addr = iicbus_get_addr(dev);
+
+ sc->reg = sy8106a_reg_attach(dev, node);
+ if (sc->reg == NULL) {
+ device_printf(dev, "cannot attach regulator\n");
+ return (ENXIO);
+ }
+
+ return (0);
+}
+
+static device_method_t sy8106a_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, sy8106a_probe),
+ DEVMETHOD(device_attach, sy8106a_attach),
+
+ /* Regdev interface */
+ DEVMETHOD(regdev_map, sy8106a_regdev_map),
+
+ DEVMETHOD_END
+};
+
+static driver_t sy8106a_driver = {
+ "sy8106a",
+ sy8106a_methods,
+ sizeof(struct sy8106a_softc),
+};
+
+static devclass_t sy8106a_devclass;
+
+EARLY_DRIVER_MODULE(sy8106a, iicbus, sy8106a_driver, sy8106a_devclass, 0, 0,
+ BUS_PASS_RESOURCE);
+MODULE_VERSION(sy8106a, 1);
+MODULE_DEPEND(sy8106a, iicbus, 1, 1, 1);
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