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 #include <sys/param.h>
28 #include <sys/systm.h>
29 #include <sys/bus.h>
30 #include <sys/kernel.h>
31 #include <sys/module.h>
32 #include <sys/resource.h>
33
34 #include <machine/bus.h>
35 #include <machine/resource.h>
36
37 #include <sys/rman.h>
38
39 #include <sys/lock.h>
40 #include <sys/mutex.h>
41
42 #include <dev/iicbus/iiconf.h>
43 #include <dev/iicbus/iicbus.h>
44 #include <dev/iicbus/twsi/twsi.h>
45 #include <dev/ofw/ofw_bus.h>
46 #include <dev/ofw/ofw_bus_subr.h>
47
48 #include <dev/extres/clk/clk.h>
49 #include <dev/extres/hwreset/hwreset.h>
50
51 #include "iicbus_if.h"
52
53 #define TWI_ADDR 0x0
54 #define TWI_XADDR 0x4
55 #define TWI_DATA 0x8
56 #define TWI_CNTR 0xC
57 #define TWI_STAT 0x10
58 #define TWI_CCR 0x14
59 #define TWI_SRST 0x18
60 #define TWI_EFR 0x1C
61 #define TWI_LCR 0x20
62
63 static struct ofw_compat_data compat_data[] = {
64 {"allwinner,sun4i-a10-i2c", 1},
65 {"allwinner,sun6i-a31-i2c", 1},
66 {"allwinner,sun8i-a83t-i2c", 1},
67 {NULL, 0},
68 };
69
70 static int
a10_twsi_probe(device_t dev)71 a10_twsi_probe(device_t dev)
72 {
73
74 if (!ofw_bus_status_okay(dev))
75 return (ENXIO);
76
77 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
78 return (ENXIO);
79
80 device_set_desc(dev, "Allwinner Integrated I2C Bus Controller");
81 return (BUS_PROBE_DEFAULT);
82 }
83
84 static int
a10_twsi_attach(device_t dev)85 a10_twsi_attach(device_t dev)
86 {
87 struct twsi_softc *sc;
88 hwreset_t rst;
89 int error;
90
91 sc = device_get_softc(dev);
92
93 /* De-assert reset */
94 if (hwreset_get_by_ofw_idx(dev, 0, 0, &rst) == 0) {
95 error = hwreset_deassert(rst);
96 if (error != 0) {
97 device_printf(dev, "could not de-assert reset\n");
98 return (error);
99 }
100 }
101
102 /* Activate clock */
103 error = clk_get_by_ofw_index(dev, 0, 0, &sc->clk_core);
104 if (error != 0) {
105 device_printf(dev, "could not find clock\n");
106 return (error);
107 }
108 error = clk_enable(sc->clk_core);
109 if (error != 0) {
110 device_printf(dev, "could not enable clock\n");
111 return (error);
112 }
113
114 sc->reg_data = TWI_DATA;
115 sc->reg_slave_addr = TWI_ADDR;
116 sc->reg_slave_ext_addr = TWI_XADDR;
117 sc->reg_control = TWI_CNTR;
118 sc->reg_status = TWI_STAT;
119 sc->reg_baud_rate = TWI_CCR;
120 sc->reg_soft_reset = TWI_SRST;
121
122 if (ofw_bus_is_compatible(dev, "allwinner,sun6i-a31-i2c") ||
123 ofw_bus_is_compatible(dev, "allwinner,sun6i-a83t-i2c"))
124 sc->iflag_w1c = true;
125 return (twsi_attach(dev));
126 }
127
128 static phandle_t
a10_twsi_get_node(device_t bus,device_t dev)129 a10_twsi_get_node(device_t bus, device_t dev)
130 {
131 return (ofw_bus_get_node(bus));
132 }
133
134 static device_method_t a10_twsi_methods[] = {
135 /* device interface */
136 DEVMETHOD(device_probe, a10_twsi_probe),
137 DEVMETHOD(device_attach, a10_twsi_attach),
138
139 /* OFW methods */
140 DEVMETHOD(ofw_bus_get_node, a10_twsi_get_node),
141
142 { 0, 0 }
143 };
144
145 DEFINE_CLASS_1(iichb, a10_twsi_driver, a10_twsi_methods,
146 sizeof(struct twsi_softc), twsi_driver);
147
148 static devclass_t a10_twsi_devclass;
149
150 EARLY_DRIVER_MODULE(a10_twsi, simplebus, a10_twsi_driver, a10_twsi_devclass,
151 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
152 EARLY_DRIVER_MODULE(iicbus, a10_twsi, iicbus_driver, iicbus_devclass,
153 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
154 MODULE_DEPEND(a10_twsi, iicbus, 1, 1, 1);
155 SIMPLEBUS_PNP_INFO(compat_data);
156