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