80466455ad
This is an MFD with regulators, an RTC and a watchdog, among other things. This adds the necessary infrastructure for specific children to be added. Note that the PMIC can also be attached via SPI, not just I2C, and so the interface is abstracted. No SPI implementation is added, however. This is the PMIC on SiFive's HiFive Unmatched. Reviewed by: manu, mhorne MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D36199
262 lines
6.3 KiB
C
262 lines
6.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2022 Jessica Clarke <jrtc27@FreeBSD.org>
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, 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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/* Dialog Semiconductor DA9063 PMIC, 2-WIRE */
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/bus.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <dev/dialog/da9063/da9063reg.h>
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#include <dev/fdt/simplebus.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include "da9063_if.h"
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#define DA9063_IIC_PAGE_SHIFT 8
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#define DA9063_IIC_PAGE_SIZE (1 << DA9063_IIC_PAGE_SHIFT)
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#define DA9063_IIC_PAGE(_a) ((_a) >> DA9063_IIC_PAGE_SHIFT)
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#define DA9063_IIC_PAGE_OFF(_a) ((_a) & (DA9063_IIC_PAGE_SIZE - 1))
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#define DA9063_IIC_ADDR(_p, _o) (((_p) << DA9063_IIC_PAGE_SHIFT) | (_o))
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/*
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* For 2-WIRE (I2C) operation pages are 256 registers but PAGE_CON is in units
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* of 128 registers with the LSB ignored so scale the page when writing to it.
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*/
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#define DA9063_IIC_PAGE_CON_REG_PAGE_SHIFT 1
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struct da9063_iic_softc {
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struct simplebus_softc simplebus_sc;
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device_t dev;
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struct mtx mtx;
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uint8_t page;
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};
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#define DA9063_IIC_LOCK(sc) mtx_lock(&(sc)->mtx)
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#define DA9063_IIC_UNLOCK(sc) mtx_unlock(&(sc)->mtx)
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#define DA9063_IIC_ASSERT_LOCKED(sc) mtx_assert(&(sc)->mtx, MA_OWNED);
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#define DA9063_IIC_ASSERT_UNLOCKED(sc) mtx_assert(&(sc)->mtx, MA_NOTOWNED);
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static struct ofw_compat_data compat_data[] = {
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{ "dlg,da9063", 1 },
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{ NULL, 0 }
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};
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static int
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da9063_iic_select_page(struct da9063_iic_softc *sc, uint16_t page)
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{
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uint8_t reg;
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int error;
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DA9063_IIC_ASSERT_LOCKED(sc);
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if (page == sc->page)
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return (0);
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error = iicdev_readfrom(sc->dev, DA9063_PAGE_CON, ®, 1, IIC_WAIT);
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if (error != 0)
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return (iic2errno(error));
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reg &= ~(DA9063_PAGE_CON_REG_PAGE_MASK <<
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DA9063_PAGE_CON_REG_PAGE_SHIFT);
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reg |= (page << DA9063_IIC_PAGE_CON_REG_PAGE_SHIFT) <<
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DA9063_PAGE_CON_REG_PAGE_SHIFT;
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error = iicdev_writeto(sc->dev, DA9063_PAGE_CON, ®, 1, IIC_WAIT);
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if (error != 0)
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return (iic2errno(error));
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sc->page = page;
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return (0);
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}
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static int
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da9063_iic_read(device_t dev, uint16_t addr, uint8_t *val)
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{
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struct da9063_iic_softc *sc;
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int error;
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sc = device_get_softc(dev);
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DA9063_IIC_LOCK(sc);
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error = da9063_iic_select_page(sc, DA9063_IIC_PAGE(addr));
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if (error != 0)
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goto error;
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error = iicdev_readfrom(dev, DA9063_IIC_PAGE_OFF(addr), val, 1,
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IIC_WAIT);
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if (error != 0)
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error = iic2errno(error);
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error:
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DA9063_IIC_UNLOCK(sc);
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return (error);
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}
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static int
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da9063_iic_write(device_t dev, uint16_t addr, uint8_t val)
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{
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struct da9063_iic_softc *sc;
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int error;
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sc = device_get_softc(dev);
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DA9063_IIC_LOCK(sc);
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error = da9063_iic_select_page(sc, DA9063_IIC_PAGE(addr));
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if (error != 0)
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goto error;
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error = iicdev_writeto(dev, DA9063_IIC_PAGE_OFF(addr), &val, 1,
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IIC_WAIT);
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if (error != 0)
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error = iic2errno(error);
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error:
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DA9063_IIC_UNLOCK(sc);
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return (error);
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}
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static int
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da9063_iic_modify(device_t dev, uint16_t addr, uint8_t clear_mask,
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uint8_t set_mask)
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{
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struct da9063_iic_softc *sc;
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uint8_t reg;
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int error;
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sc = device_get_softc(dev);
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DA9063_IIC_LOCK(sc);
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error = da9063_iic_select_page(sc, DA9063_IIC_PAGE(addr));
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if (error != 0)
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goto error;
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error = iicdev_readfrom(dev, DA9063_IIC_PAGE_OFF(addr), ®, 1,
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IIC_WAIT);
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if (error != 0) {
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error = iic2errno(error);
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goto error;
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}
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reg &= ~clear_mask;
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reg |= set_mask;
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error = iicdev_writeto(dev, DA9063_IIC_PAGE_OFF(addr), ®, 1,
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IIC_WAIT);
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if (error != 0)
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error = iic2errno(error);
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error:
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DA9063_IIC_UNLOCK(sc);
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return (error);
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}
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static int
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da9063_iic_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, "Dialog DA9063 PMIC");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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da9063_iic_attach(device_t dev)
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{
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struct da9063_iic_softc *sc;
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uint8_t reg;
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int error;
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sc = device_get_softc(dev);
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sc->dev = dev;
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error = iicdev_readfrom(dev, DA9063_PAGE_CON, ®, 1, IIC_WAIT);
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if (error != 0)
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return (iic2errno(error));
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sc->page = ((reg >> DA9063_PAGE_CON_REG_PAGE_SHIFT) &
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DA9063_PAGE_CON_REG_PAGE_MASK) >> DA9063_IIC_PAGE_CON_REG_PAGE_SHIFT;
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mtx_init(&sc->mtx, device_get_nameunit(sc->dev), NULL, MTX_DEF);
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sc->simplebus_sc.flags |= SB_FLAG_NO_RANGES;
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return (simplebus_attach(dev));
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}
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static int
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da9063_iic_detach(device_t dev)
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{
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struct da9063_iic_softc *sc;
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int error;
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sc = device_get_softc(dev);
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error = simplebus_detach(dev);
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if (error != 0)
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return (error);
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mtx_destroy(&sc->mtx);
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return (0);
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}
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static device_method_t da9063_iic_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, da9063_iic_probe),
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DEVMETHOD(device_attach, da9063_iic_attach),
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DEVMETHOD(device_detach, da9063_iic_detach),
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/* DA9063 interface */
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DEVMETHOD(da9063_read, da9063_iic_read),
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DEVMETHOD(da9063_write, da9063_iic_write),
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DEVMETHOD(da9063_modify, da9063_iic_modify),
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DEVMETHOD_END
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};
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DEFINE_CLASS_1(da9063_pmic, da9063_iic_driver, da9063_iic_methods,
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sizeof(struct da9063_iic_softc), simplebus_driver);
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DRIVER_MODULE(da9063_iic, iicbus, da9063_iic_driver, NULL, NULL);
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