156 lines
4.2 KiB
C
156 lines
4.2 KiB
C
/*-
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* Copyright (c) 2016-2019 Emmanuel Vadot <manu@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 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 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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#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/kernel.h>
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#include <sys/module.h>
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#include <sys/resource.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <sys/rman.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/twsi/twsi.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/clk/clk.h>
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#include <dev/extres/hwreset/hwreset.h>
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#include "iicbus_if.h"
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#define TWI_ADDR 0x0
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#define TWI_XADDR 0x4
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#define TWI_DATA 0x8
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#define TWI_CNTR 0xC
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#define TWI_STAT 0x10
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#define TWI_CCR 0x14
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#define TWI_SRST 0x18
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#define TWI_EFR 0x1C
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#define TWI_LCR 0x20
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static struct ofw_compat_data compat_data[] = {
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{"allwinner,sun4i-a10-i2c", 1},
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{"allwinner,sun6i-a31-i2c", 1},
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{"allwinner,sun8i-a83t-i2c", 1},
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{NULL, 0},
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};
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static int
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a10_twsi_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, "Allwinner Integrated I2C Bus Controller");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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a10_twsi_attach(device_t dev)
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{
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struct twsi_softc *sc;
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hwreset_t rst;
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int error;
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sc = device_get_softc(dev);
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/* De-assert reset */
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if (hwreset_get_by_ofw_idx(dev, 0, 0, &rst) == 0) {
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error = hwreset_deassert(rst);
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if (error != 0) {
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device_printf(dev, "could not de-assert reset\n");
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return (error);
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}
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}
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/* Activate clock */
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error = clk_get_by_ofw_index(dev, 0, 0, &sc->clk_core);
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if (error != 0) {
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device_printf(dev, "could not find clock\n");
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return (error);
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}
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error = clk_enable(sc->clk_core);
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if (error != 0) {
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device_printf(dev, "could not enable clock\n");
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return (error);
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}
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sc->reg_data = TWI_DATA;
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sc->reg_slave_addr = TWI_ADDR;
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sc->reg_slave_ext_addr = TWI_XADDR;
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sc->reg_control = TWI_CNTR;
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sc->reg_status = TWI_STAT;
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sc->reg_baud_rate = TWI_CCR;
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sc->reg_soft_reset = TWI_SRST;
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sc->need_ack = true;
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return (twsi_attach(dev));
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}
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static phandle_t
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a10_twsi_get_node(device_t bus, device_t dev)
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{
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return (ofw_bus_get_node(bus));
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}
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static device_method_t a10_twsi_methods[] = {
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/* device interface */
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DEVMETHOD(device_probe, a10_twsi_probe),
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DEVMETHOD(device_attach, a10_twsi_attach),
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/* OFW methods */
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DEVMETHOD(ofw_bus_get_node, a10_twsi_get_node),
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{ 0, 0 }
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};
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DEFINE_CLASS_1(iichb, a10_twsi_driver, a10_twsi_methods,
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sizeof(struct twsi_softc), twsi_driver);
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static devclass_t a10_twsi_devclass;
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EARLY_DRIVER_MODULE(a10_twsi, simplebus, a10_twsi_driver, a10_twsi_devclass,
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0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
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EARLY_DRIVER_MODULE(iicbus, a10_twsi, iicbus_driver, iicbus_devclass,
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0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
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MODULE_DEPEND(a10_twsi, iicbus, 1, 1, 1);
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SIMPLEBUS_PNP_INFO(compat_data);
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