2 * Copyright (c) 2016 Emmanuel Vadot <manu@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/resource.h>
37 #include <machine/bus.h>
38 #include <machine/resource.h>
43 #include <sys/mutex.h>
45 #include <dev/iicbus/iiconf.h>
46 #include <dev/iicbus/iicbus.h>
47 #include <dev/iicbus/twsi/twsi.h>
48 #include <dev/ofw/ofw_bus.h>
49 #include <dev/ofw/ofw_bus_subr.h>
51 #include <dev/extres/clk/clk.h>
52 #include <dev/extres/hwreset/hwreset.h>
54 #include "iicbus_if.h"
66 static struct ofw_compat_data compat_data[] = {
67 {"allwinner,sun4i-a10-i2c", 1},
68 {"allwinner,sun6i-a31-i2c", 1},
69 {"allwinner,sun8i-a83t-i2c", 1},
74 a10_twsi_probe(device_t dev)
77 if (!ofw_bus_status_okay(dev))
80 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
83 device_set_desc(dev, "Allwinner Integrated I2C Bus Controller");
84 return (BUS_PROBE_DEFAULT);
88 a10_twsi_attach(device_t dev)
90 struct twsi_softc *sc;
95 sc = device_get_softc(dev);
98 if (hwreset_get_by_ofw_idx(dev, 0, 0, &rst) == 0) {
99 error = hwreset_deassert(rst);
101 device_printf(dev, "could not de-assert reset\n");
107 error = clk_get_by_ofw_index(dev, 0, 0, &clk);
109 device_printf(dev, "could not find clock\n");
112 error = clk_enable(clk);
114 device_printf(dev, "could not enable clock\n");
118 sc->reg_data = TWI_DATA;
119 sc->reg_slave_addr = TWI_ADDR;
120 sc->reg_slave_ext_addr = TWI_XADDR;
121 sc->reg_control = TWI_CNTR;
122 sc->reg_status = TWI_STAT;
123 sc->reg_baud_rate = TWI_CCR;
124 sc->reg_soft_reset = TWI_SRST;
126 /* Setup baud rate params */
127 sc->baud_rate[IIC_SLOW].param = TWSI_BAUD_RATE_PARAM(11, 2);
128 sc->baud_rate[IIC_FAST].param = TWSI_BAUD_RATE_PARAM(11, 2);
129 sc->baud_rate[IIC_FASTEST].param = TWSI_BAUD_RATE_PARAM(2, 2);
131 return (twsi_attach(dev));
135 a10_twsi_get_node(device_t bus, device_t dev)
137 return (ofw_bus_get_node(bus));
140 static device_method_t a10_twsi_methods[] = {
141 /* device interface */
142 DEVMETHOD(device_probe, a10_twsi_probe),
143 DEVMETHOD(device_attach, a10_twsi_attach),
146 DEVMETHOD(ofw_bus_get_node, a10_twsi_get_node),
151 DEFINE_CLASS_1(iichb, a10_twsi_driver, a10_twsi_methods,
152 sizeof(struct twsi_softc), twsi_driver);
154 static devclass_t a10_twsi_devclass;
156 EARLY_DRIVER_MODULE(a10_twsi, simplebus, a10_twsi_driver, a10_twsi_devclass,
157 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
158 EARLY_DRIVER_MODULE(iicbus, a10_twsi, iicbus_driver, iicbus_devclass,
159 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
160 MODULE_DEPEND(a10_twsi, iicbus, 1, 1, 1);