6305020526
Make that distinction more explicit and regular in the code. The difference in behavior is documented in the respective datasheets. Previously, the code handled the distinction by writing the control register multiple times where at least one write was zero and another was one. This can be considered a follow-up to r363021. Reviewed by: manu MFC after: 4 weeks Differential Revision: https://reviews.freebsd.org/D26308
160 lines
4.3 KiB
C
160 lines
4.3 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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if (ofw_bus_is_compatible(dev, "allwinner,sun6i-a31-i2c") ||
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ofw_bus_is_compatible(dev, "allwinner,sun6i-a83t-i2c"))
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sc->iflag_w1c = 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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