1 /* $OpenBSD: omapid.c,v 1.6 2024/05/13 01:15:50 jsg Exp $ */
2 /*
3 * Copyright (c) 2013 Dale Rahn <drahn@dalerahn.com>
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 #include <machine/bus.h>
22 #include <armv7/armv7/armv7var.h>
23
24 #include <dev/ofw/fdt.h>
25
26 /* registers */
27 #define O4_ID_SIZE 0x1000
28 #define O4_FUSE_ID0 0x200
29 #define O4_ID_CODE 0x204
30 #define O4_FUSE_ID1 0x208
31 #define O4_FUSE_ID2 0x20C
32 #define O4_FUSE_ID3 0x210
33 #define O4_FUSE_PRODID0 0x214
34 #define O4_FUSE_PRODID1 0x218
35
36
37 struct omapid_softc {
38 struct device sc_dev;
39 bus_space_tag_t sc_iot;
40 bus_space_handle_t sc_ioh;
41 };
42
43 struct omapid_softc *omapid_sc;
44
45
46 void omapid_attach(struct device *parent, struct device *self, void *args);
47
48 const struct cfattach omapid_ca = {
49 sizeof (struct omapid_softc), NULL, omapid_attach
50 };
51
52 struct cfdriver omapid_cd = {
53 NULL, "omapid", DV_DULL
54 };
55
56 void amptimer_set_clockrate(int32_t new_frequency); /* XXX */
57
58 void
omapid_attach(struct device * parent,struct device * self,void * args)59 omapid_attach(struct device *parent, struct device *self, void *args)
60 {
61 struct armv7_attach_args *aa = args;
62 struct omapid_softc *sc = (struct omapid_softc *) self;
63 uint32_t rev;
64 uint32_t newclockrate = 0;
65 char *board;
66 void *node;
67
68 sc->sc_iot = aa->aa_iot;
69 if (bus_space_map(sc->sc_iot, aa->aa_dev->mem[0].addr,
70 aa->aa_dev->mem[0].size, 0, &sc->sc_ioh))
71 panic("omapid: bus_space_map failed!");
72
73 omapid_sc = sc;
74
75 node = fdt_find_node("/");
76 if (node == NULL)
77 panic("%s: could not get fdt root node",
78 sc->sc_dev.dv_xname);
79
80 board = "unknown";
81 if (fdt_is_compatible(node, "ti,omap4")) {
82 rev = bus_space_read_4(sc->sc_iot, sc->sc_ioh, O4_ID_CODE);
83 switch ((rev >> 12) & 0xffff) {
84 case 0xB852:
85 case 0xB95C:
86 board = "omap4430";
87 newclockrate = 400 * 1000 * 1000;
88 break;
89 case 0xB94E:
90 board = "omap4460";
91 newclockrate = 350 * 1000 * 1000;
92 break;
93 }
94 }
95 printf(": %s\n", board);
96 if (newclockrate != 0)
97 amptimer_set_clockrate(newclockrate);
98 }
99