rk30xx_grf.c revision 256949 
1/*-
2 * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@gmail.com>
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
27/* General Register File for Rockchip RK30xx */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/sys/arm/rockchip/rk30xx_grf.c 256949 2013-10-23 00:39:43Z ganbold $");
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 <machine/bus.h>
53#include <machine/fdt.h>
54
55#include "rk30xx_grf.h"
56
57struct rk30_grf_softc {
58	struct resource		*res;
59	bus_space_tag_t		bst;
60	bus_space_handle_t	bsh;
61};
62
63static struct rk30_grf_softc *rk30_grf_sc = NULL;
64
65#define	grf_read_4(sc, reg)		\
66	bus_space_read_4((sc)->bst, (sc)->bsh, (reg))
67#define	grf_write_4(sc, reg, val)	\
68	bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val))
69
70static int
71rk30_grf_probe(device_t dev)
72{
73
74	if (ofw_bus_is_compatible(dev, "rockchip,rk30xx-grf")) {
75		device_set_desc(dev, "RK30XX General Register File");
76		return(BUS_PROBE_DEFAULT);
77	}
78
79	return (ENXIO);
80}
81
82static int
83rk30_grf_attach(device_t dev)
84{
85	struct rk30_grf_softc *sc = device_get_softc(dev);
86	int rid = 0;
87
88	if (rk30_grf_sc)
89		return (ENXIO);
90
91	sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
92	if (!sc->res) {
93		device_printf(dev, "could not allocate resource\n");
94		return (ENXIO);
95	}
96
97	sc->bst = rman_get_bustag(sc->res);
98	sc->bsh = rman_get_bushandle(sc->res);
99
100	rk30_grf_sc = sc;
101
102	return (0);
103}
104
105static device_method_t rk30_grf_methods[] = {
106	DEVMETHOD(device_probe,		rk30_grf_probe),
107	DEVMETHOD(device_attach,	rk30_grf_attach),
108	{ 0, 0 }
109};
110
111static driver_t rk30_grf_driver = {
112	"rk30_grf",
113	rk30_grf_methods,
114	sizeof(struct rk30_grf_softc),
115};
116
117static devclass_t rk30_grf_devclass;
118
119DRIVER_MODULE(rk30_grf, simplebus, rk30_grf_driver, rk30_grf_devclass, 0, 0);
120
121void
122rk30_grf_gpio_pud(uint32_t bank, uint32_t pin, uint32_t state)
123{
124	uint32_t offset;
125
126	offset = GRF_GPIO0B_PULL - 4 + (bank * 16) + ((pin / 8) * 4);
127	pin = (7 - (pin % 8)) * 2;
128	grf_write_4(rk30_grf_sc, offset, (0x3 << (16 + pin)) | (state << pin));
129}
130
131