a10_sramc.c revision 281085 
1/*-
2 * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE 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 THE 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
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/arm/allwinner/a10_sramc.c 281085 2015-04-04 21:34:26Z andrew $
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/sys/arm/allwinner/a10_sramc.c 281085 2015-04-04 21:34:26Z andrew $");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/bus.h>
35#include <sys/kernel.h>
36#include <sys/module.h>
37#include <sys/malloc.h>
38#include <sys/rman.h>
39#include <sys/timeet.h>
40#include <sys/timetc.h>
41#include <sys/watchdog.h>
42#include <machine/bus.h>
43#include <machine/cpu.h>
44#include <machine/frame.h>
45#include <machine/intr.h>
46
47#include <dev/fdt/fdt_common.h>
48#include <dev/ofw/openfirm.h>
49#include <dev/ofw/ofw_bus.h>
50#include <dev/ofw/ofw_bus_subr.h>
51
52#include "a10_sramc.h"
53
54#define	SRAM_CTL1_CFG		0x04
55
56struct a10_sramc_softc {
57	struct resource		*res;
58	bus_space_tag_t		bst;
59	bus_space_handle_t	bsh;
60};
61
62static struct a10_sramc_softc *a10_sramc_sc;
63
64#define	sramc_read_4(sc, reg)		\
65    bus_space_read_4((sc)->bst, (sc)->bsh, (reg))
66#define	sramc_write_4(sc, reg, val)	\
67    bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val))
68
69
70static int
71a10_sramc_probe(device_t dev)
72{
73
74	if (ofw_bus_is_compatible(dev, "allwinner,sun4i-sramc")) {
75		device_set_desc(dev, "Allwinner sramc module");
76		return (BUS_PROBE_DEFAULT);
77	}
78
79	return (ENXIO);
80}
81
82static int
83a10_sramc_attach(device_t dev)
84{
85	struct a10_sramc_softc *sc = device_get_softc(dev);
86	int rid = 0;
87
88	sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
89	if (!sc->res) {
90		device_printf(dev, "could not allocate resource\n");
91		return (ENXIO);
92	}
93
94	sc->bst = rman_get_bustag(sc->res);
95	sc->bsh = rman_get_bushandle(sc->res);
96
97	a10_sramc_sc = sc;
98
99	return (0);
100}
101
102static device_method_t a10_sramc_methods[] = {
103	DEVMETHOD(device_probe,		a10_sramc_probe),
104	DEVMETHOD(device_attach,	a10_sramc_attach),
105	{ 0, 0 }
106};
107
108static driver_t a10_sramc_driver = {
109	"a10_sramc",
110	a10_sramc_methods,
111	sizeof(struct a10_sramc_softc),
112};
113
114static devclass_t a10_sramc_devclass;
115
116DRIVER_MODULE(a10_sramc, simplebus, a10_sramc_driver, a10_sramc_devclass, 0, 0);
117
118int
119a10_map_to_emac(void)
120{
121	struct a10_sramc_softc *sc = a10_sramc_sc;
122	uint32_t reg_value;
123
124	if (sc == NULL)
125		return (ENXIO);
126
127	/* Map SRAM to EMAC, set bit 2 and 4. */
128	reg_value = sramc_read_4(sc, SRAM_CTL1_CFG);
129	reg_value |= 0x5 << 2;
130	sramc_write_4(sc, SRAM_CTL1_CFG, reg_value);
131
132	return (0);
133}
134