1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /*
30 * Vybrid Family Direct Memory Access Multiplexer (DMAMUX)
31 * Chapter 22, Vybrid Reference Manual, Rev. 5, 07/2013
32 */
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/bus.h>
37 #include <sys/kernel.h>
38 #include <sys/module.h>
39 #include <sys/malloc.h>
40 #include <sys/rman.h>
41 #include <sys/timeet.h>
42 #include <sys/timetc.h>
43 #include <sys/watchdog.h>
44
45 #include <dev/ofw/openfirm.h>
46 #include <dev/ofw/ofw_bus.h>
47 #include <dev/ofw/ofw_bus_subr.h>
48
49 #include <machine/bus.h>
50 #include <machine/cpu.h>
51 #include <machine/intr.h>
52
53 #include <arm/freescale/vybrid/vf_common.h>
54 #include <arm/freescale/vybrid/vf_dmamux.h>
55
56 #define DMAMUX_CHCFG(n) (0x1 * n) /* Channels 0-15 Cfg Reg */
57 #define CHCFG_ENBL (1 << 7) /* Channel Enable */
58 #define CHCFG_TRIG (1 << 6) /* Channel Trigger Enable */
59 #define CHCFG_SOURCE_MASK 0x3f /* Channel Source (Slot) */
60 #define CHCFG_SOURCE_SHIFT 0
61
62 struct dmamux_softc {
63 struct resource *res[4];
64 bus_space_tag_t bst[4];
65 bus_space_handle_t bsh[4];
66 };
67
68 struct dmamux_softc *dmamux_sc;
69
70 static struct resource_spec dmamux_spec[] = {
71 { SYS_RES_MEMORY, 0, RF_ACTIVE }, /* DMAMUX0 */
72 { SYS_RES_MEMORY, 1, RF_ACTIVE }, /* DMAMUX1 */
73 { SYS_RES_MEMORY, 2, RF_ACTIVE }, /* DMAMUX2 */
74 { SYS_RES_MEMORY, 3, RF_ACTIVE }, /* DMAMUX3 */
75 { -1, 0 }
76 };
77
78 static int
dmamux_probe(device_t dev)79 dmamux_probe(device_t dev)
80 {
81
82 if (!ofw_bus_status_okay(dev))
83 return (ENXIO);
84
85 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-dmamux"))
86 return (ENXIO);
87
88 device_set_desc(dev, "Vybrid Family Direct Memory Access Multiplexer");
89 return (BUS_PROBE_DEFAULT);
90 }
91
92 int
dmamux_configure(int mux,int source,int channel,int enable)93 dmamux_configure(int mux, int source, int channel, int enable)
94 {
95 struct dmamux_softc *sc;
96 int reg;
97
98 sc = dmamux_sc;
99
100 MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), 0x0);
101
102 reg = 0;
103 if (enable)
104 reg |= (CHCFG_ENBL);
105
106 reg &= ~(CHCFG_SOURCE_MASK << CHCFG_SOURCE_SHIFT);
107 reg |= (source << CHCFG_SOURCE_SHIFT);
108
109 MUX_WRITE1(sc, mux, DMAMUX_CHCFG(channel), reg);
110
111 return (0);
112 }
113
114 static int
dmamux_attach(device_t dev)115 dmamux_attach(device_t dev)
116 {
117 struct dmamux_softc *sc;
118 int i;
119
120 sc = device_get_softc(dev);
121
122 if (bus_alloc_resources(dev, dmamux_spec, sc->res)) {
123 device_printf(dev, "could not allocate resources\n");
124 return (ENXIO);
125 }
126
127 /* Memory interface */
128 for (i = 0; i < 4; i++) {
129 sc->bst[i] = rman_get_bustag(sc->res[i]);
130 sc->bsh[i] = rman_get_bushandle(sc->res[i]);
131 }
132
133 dmamux_sc = sc;
134
135 return (0);
136 }
137
138 static device_method_t dmamux_methods[] = {
139 DEVMETHOD(device_probe, dmamux_probe),
140 DEVMETHOD(device_attach, dmamux_attach),
141 { 0, 0 }
142 };
143
144 static driver_t dmamux_driver = {
145 "dmamux",
146 dmamux_methods,
147 sizeof(struct dmamux_softc),
148 };
149
150 DRIVER_MODULE(dmamux, simplebus, dmamux_driver, 0, 0);
151