xref: /openbsd-src/sys/dev/fdt/amlreset.c (revision 9fdf0c627b1fec102f212f847a6f7676c1829e65)
1 /*	$OpenBSD: amlreset.c,v 1.2 2021/10/24 17:52:26 mpi Exp $	*/
2 /*
3  * Copyright (c) 2019 Mark Kettenis <kettenis@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/param.h>
19 #include <sys/systm.h>
20 #include <sys/device.h>
21 
22 #include <machine/intr.h>
23 #include <machine/bus.h>
24 #include <machine/fdt.h>
25 
26 #include <dev/ofw/openfirm.h>
27 #include <dev/ofw/ofw_clock.h>
28 #include <dev/ofw/ofw_misc.h>
29 #include <dev/ofw/fdt.h>
30 
31 #define RESET0_REGISTER		0x0000
32 #define RESET0_MASK		0x003c
33 #define RESET0_LEVEL		0x007c
34 
35 #define HREAD4(sc, reg)							\
36 	(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
37 #define HWRITE4(sc, reg, val)						\
38 	bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
39 #define HSET4(sc, reg, bits)						\
40 	HWRITE4((sc), (reg), HREAD4((sc), (reg)) | (bits))
41 #define HCLR4(sc, reg, bits)						\
42 	HWRITE4((sc), (reg), HREAD4((sc), (reg)) & ~(bits))
43 
44 struct amlreset_softc {
45 	struct device		sc_dev;
46 	bus_space_tag_t		sc_iot;
47 	bus_space_handle_t	sc_ioh;
48 
49 	struct reset_device	sc_rd;
50 };
51 
52 int amlreset_match(struct device *, void *, void *);
53 void amlreset_attach(struct device *, struct device *, void *);
54 
55 const struct cfattach	amlreset_ca = {
56 	sizeof (struct amlreset_softc), amlreset_match, amlreset_attach
57 };
58 
59 struct cfdriver amlreset_cd = {
60 	NULL, "amlreset", DV_DULL
61 };
62 
63 void	amlreset_reset(void *, uint32_t *, int);
64 
65 int
amlreset_match(struct device * parent,void * match,void * aux)66 amlreset_match(struct device *parent, void *match, void *aux)
67 {
68 	struct fdt_attach_args *faa = aux;
69 
70 	return OF_is_compatible(faa->fa_node, "amlogic,meson-axg-reset");
71 }
72 
73 void
amlreset_attach(struct device * parent,struct device * self,void * aux)74 amlreset_attach(struct device *parent, struct device *self, void *aux)
75 {
76 	struct amlreset_softc *sc = (struct amlreset_softc *)self;
77 	struct fdt_attach_args *faa = aux;
78 
79 	if (faa->fa_nreg < 1) {
80 		printf(": no registers\n");
81 		return;
82 	}
83 
84 	sc->sc_iot = faa->fa_iot;
85 	if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
86 	    faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
87 		printf(": can't map registers\n");
88 		return;
89 	}
90 
91 	printf("\n");
92 
93 	sc->sc_rd.rd_node = faa->fa_node;
94 	sc->sc_rd.rd_cookie = sc;
95 	sc->sc_rd.rd_reset = amlreset_reset;
96 	reset_register(&sc->sc_rd);
97 }
98 
99 void
amlreset_reset(void * cookie,uint32_t * cells,int assert)100 amlreset_reset(void *cookie, uint32_t *cells, int assert)
101 {
102 	struct amlreset_softc *sc = cookie;
103 	uint32_t bank = cells[0] / 32;
104 	uint32_t bit = cells[0] % 32;
105 
106 	if (assert)
107 		HCLR4(sc, RESET0_LEVEL + bank * 4, (1 << bit));
108 	else
109 		HSET4(sc, RESET0_LEVEL + bank * 4, (1 << bit));
110 }
111