303 lines
7.0 KiB
C
303 lines
7.0 KiB
C
/*-
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* Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Silergy Corp. SY8106A buck regulator
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/rman.h>
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#include <sys/kernel.h>
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#include <sys/reboot.h>
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#include <sys/module.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/extres/regulator/regulator.h>
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#include "iicbus_if.h"
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#include "regdev_if.h"
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#define VOUT1_SEL 0x01
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#define SEL_GO (1 << 7)
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#define SEL_VOLTAGE_MASK 0x7f
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#define SEL_VOLTAGE_BASE 680000 /* uV */
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#define SEL_VOLTAGE_STEP 10000 /* uV */
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#define VOUT_COM 0x02
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#define COM_DISABLE (1 << 0)
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#define SYS_STATUS 0x06
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static struct ofw_compat_data compat_data[] = {
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{ "silergy,sy8106a", 1 },
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{ NULL, 0 }
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};
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struct sy8106a_reg_sc {
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struct regnode *regnode;
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device_t base_dev;
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phandle_t xref;
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struct regnode_std_param *param;
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};
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struct sy8106a_softc {
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uint16_t addr;
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/* Regulator */
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struct sy8106a_reg_sc *reg;
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};
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static int
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sy8106a_read(device_t dev, uint8_t reg, uint8_t *data, uint8_t size)
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{
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struct sy8106a_softc *sc;
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struct iic_msg msg[2];
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sc = device_get_softc(dev);
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msg[0].slave = sc->addr;
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msg[0].flags = IIC_M_WR;
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msg[0].len = 1;
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msg[0].buf = ®
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msg[1].slave = sc->addr;
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msg[1].flags = IIC_M_RD;
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msg[1].len = size;
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msg[1].buf = data;
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return (iicbus_transfer(dev, msg, 2));
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}
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static int
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sy8106a_write(device_t dev, uint8_t reg, uint8_t val)
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{
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struct sy8106a_softc *sc;
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struct iic_msg msg;
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uint8_t buffer[2];
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sc = device_get_softc(dev);
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buffer[0] = reg;
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buffer[1] = val;
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msg.slave = sc->addr;
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msg.flags = IIC_M_WR;
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msg.len = 2;
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msg.buf = buffer;
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return (iicbus_transfer(dev, &msg, 1));
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}
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static int
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sy8106a_regnode_init(struct regnode *regnode)
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{
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return (0);
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}
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static int
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sy8106a_regnode_enable(struct regnode *regnode, bool enable, int *udelay)
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{
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struct sy8106a_reg_sc *sc;
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uint8_t val;
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sc = regnode_get_softc(regnode);
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sy8106a_read(sc->base_dev, VOUT_COM, &val, 1);
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if (enable)
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val &= ~COM_DISABLE;
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else
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val |= COM_DISABLE;
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sy8106a_write(sc->base_dev, VOUT_COM, val);
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*udelay = sc->param->ramp_delay;
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return (0);
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}
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static int
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sy8106a_regnode_set_voltage(struct regnode *regnode, int min_uvolt,
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int max_uvolt, int *udelay)
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{
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struct sy8106a_reg_sc *sc;
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int cur_uvolt;
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uint8_t val, oval;
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sc = regnode_get_softc(regnode);
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/* Get current voltage */
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sy8106a_read(sc->base_dev, VOUT1_SEL, &oval, 1);
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cur_uvolt = (oval & SEL_VOLTAGE_MASK) * SEL_VOLTAGE_STEP +
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SEL_VOLTAGE_BASE;
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/* Set new voltage */
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val = SEL_GO | ((min_uvolt - SEL_VOLTAGE_BASE) / SEL_VOLTAGE_STEP);
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sy8106a_write(sc->base_dev, VOUT1_SEL, val);
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/* Time to delay is based on the number of voltage steps */
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*udelay = sc->param->ramp_delay *
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(abs(cur_uvolt - min_uvolt) / SEL_VOLTAGE_STEP);
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return (0);
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}
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static int
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sy8106a_regnode_get_voltage(struct regnode *regnode, int *uvolt)
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{
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struct sy8106a_reg_sc *sc;
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uint8_t val;
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sc = regnode_get_softc(regnode);
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sy8106a_read(sc->base_dev, VOUT1_SEL, &val, 1);
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*uvolt = (val & SEL_VOLTAGE_MASK) * SEL_VOLTAGE_STEP +
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SEL_VOLTAGE_BASE;
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return (0);
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}
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static regnode_method_t sy8106a_regnode_methods[] = {
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/* Regulator interface */
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REGNODEMETHOD(regnode_init, sy8106a_regnode_init),
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REGNODEMETHOD(regnode_enable, sy8106a_regnode_enable),
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REGNODEMETHOD(regnode_set_voltage, sy8106a_regnode_set_voltage),
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REGNODEMETHOD(regnode_get_voltage, sy8106a_regnode_get_voltage),
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REGNODEMETHOD_END
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};
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DEFINE_CLASS_1(sy8106a_regnode, sy8106a_regnode_class, sy8106a_regnode_methods,
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sizeof(struct sy8106a_reg_sc), regnode_class);
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static struct sy8106a_reg_sc *
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sy8106a_reg_attach(device_t dev, phandle_t node)
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{
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struct sy8106a_reg_sc *reg_sc;
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struct regnode_init_def initdef;
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struct regnode *regnode;
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memset(&initdef, 0, sizeof(initdef));
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regulator_parse_ofw_stdparam(dev, node, &initdef);
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initdef.id = 0;
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initdef.ofw_node = node;
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regnode = regnode_create(dev, &sy8106a_regnode_class, &initdef);
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if (regnode == NULL) {
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device_printf(dev, "cannot create regulator\n");
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return (NULL);
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}
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reg_sc = regnode_get_softc(regnode);
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reg_sc->regnode = regnode;
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reg_sc->base_dev = dev;
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reg_sc->xref = OF_xref_from_node(node);
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reg_sc->param = regnode_get_stdparam(regnode);
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regnode_register(regnode);
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return (reg_sc);
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}
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static int
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sy8106a_regdev_map(device_t dev, phandle_t xref, int ncells, pcell_t *cells,
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intptr_t *num)
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{
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struct sy8106a_softc *sc;
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sc = device_get_softc(dev);
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if (sc->reg->xref != xref)
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return (ENXIO);
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*num = 0;
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return (0);
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}
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static int
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sy8106a_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
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return (ENXIO);
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device_set_desc(dev, "Silergy SY8106A regulator");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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sy8106a_attach(device_t dev)
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{
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struct sy8106a_softc *sc;
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phandle_t node;
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sc = device_get_softc(dev);
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node = ofw_bus_get_node(dev);
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sc->addr = iicbus_get_addr(dev);
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sc->reg = sy8106a_reg_attach(dev, node);
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if (sc->reg == NULL) {
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device_printf(dev, "cannot attach regulator\n");
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return (ENXIO);
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}
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return (0);
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}
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static device_method_t sy8106a_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, sy8106a_probe),
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DEVMETHOD(device_attach, sy8106a_attach),
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/* Regdev interface */
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DEVMETHOD(regdev_map, sy8106a_regdev_map),
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DEVMETHOD_END
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};
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static driver_t sy8106a_driver = {
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"sy8106a",
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sy8106a_methods,
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sizeof(struct sy8106a_softc),
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};
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static devclass_t sy8106a_devclass;
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EARLY_DRIVER_MODULE(sy8106a, iicbus, sy8106a_driver, sy8106a_devclass, 0, 0,
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BUS_PASS_RESOURCE);
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MODULE_VERSION(sy8106a, 1);
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MODULE_DEPEND(sy8106a, iicbus, 1, 1, 1);
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IICBUS_FDT_PNP_INFO(compat_data);
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