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/*-
* Copyright (c) 2016 Emmanuel Vadot <manu@bidouilliste.com>
* 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/resource.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <dev/iicbus/iiconf.h>
#include <dev/iicbus/iicbus.h>
#include <dev/iicbus/twsi/twsi.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/extres/clk/clk.h>
#include <dev/extres/hwreset/hwreset.h>
#include "iicbus_if.h"
#define TWI_ADDR 0x0
#define TWI_XADDR 0x4
#define TWI_DATA 0x8
#define TWI_CNTR 0xC
#define TWI_STAT 0x10
#define TWI_CCR 0x14
#define TWI_SRST 0x18
#define TWI_EFR 0x1C
#define TWI_LCR 0x20
static struct ofw_compat_data compat_data[] = {
{"allwinner,sun4i-a10-i2c", 1},
{"allwinner,sun6i-a31-i2c", 1},
{NULL, 0},
};
static int
a10_twsi_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, "Allwinner Integrated I2C Bus Controller");
return (BUS_PROBE_DEFAULT);
}
static int
a10_twsi_attach(device_t dev)
{
struct twsi_softc *sc;
clk_t clk;
hwreset_t rst;
int error;
sc = device_get_softc(dev);
/* De-assert reset */
if (hwreset_get_by_ofw_idx(dev, 0, &rst) == 0) {
error = hwreset_deassert(rst);
if (error != 0) {
device_printf(dev, "could not de-assert reset\n");
return (error);
}
}
/* Activate clock */
error = clk_get_by_ofw_index(dev, 0, &clk);
if (error != 0) {
device_printf(dev, "could not find clock\n");
return (error);
}
error = clk_enable(clk);
if (error != 0) {
device_printf(dev, "could not enable clock\n");
return (error);
}
sc->reg_data = TWI_DATA;
sc->reg_slave_addr = TWI_ADDR;
sc->reg_slave_ext_addr = TWI_XADDR;
sc->reg_control = TWI_CNTR;
sc->reg_status = TWI_STAT;
sc->reg_baud_rate = TWI_CCR;
sc->reg_soft_reset = TWI_SRST;
/* Setup baud rate params */
sc->baud_rate[IIC_SLOW].param = TWSI_BAUD_RATE_PARAM(11, 2);
sc->baud_rate[IIC_FAST].param = TWSI_BAUD_RATE_PARAM(11, 2);
sc->baud_rate[IIC_FASTEST].param = TWSI_BAUD_RATE_PARAM(2, 2);
return (twsi_attach(dev));
}
static phandle_t
a10_twsi_get_node(device_t bus, device_t dev)
{
return (ofw_bus_get_node(bus));
}
static device_method_t a10_twsi_methods[] = {
/* device interface */
DEVMETHOD(device_probe, a10_twsi_probe),
DEVMETHOD(device_attach, a10_twsi_attach),
/* OFW methods */
DEVMETHOD(ofw_bus_get_node, a10_twsi_get_node),
{ 0, 0 }
};
DEFINE_CLASS_1(iichb, a10_twsi_driver, a10_twsi_methods,
sizeof(struct twsi_softc), twsi_driver);
static devclass_t a10_twsi_devclass;
DRIVER_MODULE(a10_twsi, simplebus, a10_twsi_driver, a10_twsi_devclass, 0, 0);
DRIVER_MODULE(iicbus, a10_twsi, iicbus_driver, iicbus_devclass, 0, 0);
MODULE_DEPEND(a10_twsi, iicbus, 1, 1, 1);
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