1/*-
2 * Copyright (c) 2016-2019 Emmanuel Vadot <manu@freebsd.org>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD$");
28
29#include <sys/param.h>
30#include <sys/systm.h>
31#include <sys/bus.h>
32#include <sys/kernel.h>
33#include <sys/module.h>
34#include <sys/resource.h>
35
36#include <machine/bus.h>
37#include <machine/resource.h>
38
39#include <sys/rman.h>
40
41#include <sys/lock.h>
42#include <sys/mutex.h>
43
44#include <dev/iicbus/iiconf.h>
45#include <dev/iicbus/iicbus.h>
46#include <dev/iicbus/twsi/twsi.h>
47#include <dev/ofw/ofw_bus.h>
48#include <dev/ofw/ofw_bus_subr.h>
49
50#include <dev/extres/clk/clk.h>
51#include <dev/extres/hwreset/hwreset.h>
52
53#include "iicbus_if.h"
54
55#define	TWI_ADDR	0x0
56#define	TWI_XADDR	0x4
57#define	TWI_DATA	0x8
58#define	TWI_CNTR	0xC
59#define	TWI_STAT	0x10
60#define	TWI_CCR		0x14
61#define	TWI_SRST	0x18
62#define	TWI_EFR		0x1C
63#define	TWI_LCR		0x20
64
65static struct ofw_compat_data compat_data[] = {
66	{"allwinner,sun4i-a10-i2c", 1},
67	{"allwinner,sun6i-a31-i2c", 1},
68	{"allwinner,sun8i-a83t-i2c", 1},
69	{NULL, 0},
70};
71
72static int
73a10_twsi_probe(device_t dev)
74{
75
76	if (!ofw_bus_status_okay(dev))
77		return (ENXIO);
78
79	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
80		return (ENXIO);
81
82	device_set_desc(dev, "Allwinner Integrated I2C Bus Controller");
83	return (BUS_PROBE_DEFAULT);
84}
85
86static int
87a10_twsi_attach(device_t dev)
88{
89	struct twsi_softc *sc;
90	hwreset_t rst;
91	int error;
92
93	sc = device_get_softc(dev);
94
95	/* De-assert reset */
96	if (hwreset_get_by_ofw_idx(dev, 0, 0, &rst) == 0) {
97		error = hwreset_deassert(rst);
98		if (error != 0) {
99			device_printf(dev, "could not de-assert reset\n");
100			return (error);
101		}
102	}
103
104	/* Activate clock */
105	error = clk_get_by_ofw_index(dev, 0, 0, &sc->clk_core);
106	if (error != 0) {
107		device_printf(dev, "could not find clock\n");
108		return (error);
109	}
110	error = clk_enable(sc->clk_core);
111	if (error != 0) {
112		device_printf(dev, "could not enable clock\n");
113		return (error);
114	}
115
116	sc->reg_data = TWI_DATA;
117	sc->reg_slave_addr = TWI_ADDR;
118	sc->reg_slave_ext_addr = TWI_XADDR;
119	sc->reg_control = TWI_CNTR;
120	sc->reg_status = TWI_STAT;
121	sc->reg_baud_rate = TWI_CCR;
122	sc->reg_soft_reset = TWI_SRST;
123
124	sc->need_ack = true;
125
126	if (ofw_bus_is_compatible(dev, "allwinner,sun6i-a31-i2c") ||
127	    ofw_bus_is_compatible(dev, "allwinner,sun6i-a83t-i2c"))
128		sc->iflag_w1c = true;
129	return (twsi_attach(dev));
130}
131
132static phandle_t
133a10_twsi_get_node(device_t bus, device_t dev)
134{
135	return (ofw_bus_get_node(bus));
136}
137
138static device_method_t a10_twsi_methods[] = {
139	/* device interface */
140	DEVMETHOD(device_probe,		a10_twsi_probe),
141	DEVMETHOD(device_attach,	a10_twsi_attach),
142
143	/* OFW methods */
144	DEVMETHOD(ofw_bus_get_node,	a10_twsi_get_node),
145
146	{ 0, 0 }
147};
148
149DEFINE_CLASS_1(iichb, a10_twsi_driver, a10_twsi_methods,
150    sizeof(struct twsi_softc), twsi_driver);
151
152static devclass_t a10_twsi_devclass;
153
154EARLY_DRIVER_MODULE(a10_twsi, simplebus, a10_twsi_driver, a10_twsi_devclass,
155    0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
156EARLY_DRIVER_MODULE(iicbus, a10_twsi, iicbus_driver, iicbus_devclass,
157    0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
158MODULE_DEPEND(a10_twsi, iicbus, 1, 1, 1);
159SIMPLEBUS_PNP_INFO(compat_data);
160