1 /* $OpenBSD: omapid.c,v 1.5 2021/10/24 17:52:27 mpi 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 void omapid_wpending(int flags); 48 49 const struct cfattach omapid_ca = { 50 sizeof (struct omapid_softc), NULL, omapid_attach 51 }; 52 53 struct cfdriver omapid_cd = { 54 NULL, "omapid", DV_DULL 55 }; 56 57 void amptimer_set_clockrate(int32_t new_frequency); /* XXX */ 58 59 void 60 omapid_attach(struct device *parent, struct device *self, void *args) 61 { 62 struct armv7_attach_args *aa = args; 63 struct omapid_softc *sc = (struct omapid_softc *) self; 64 uint32_t rev; 65 uint32_t newclockrate = 0; 66 char *board; 67 void *node; 68 69 sc->sc_iot = aa->aa_iot; 70 if (bus_space_map(sc->sc_iot, aa->aa_dev->mem[0].addr, 71 aa->aa_dev->mem[0].size, 0, &sc->sc_ioh)) 72 panic("omapid: bus_space_map failed!"); 73 74 omapid_sc = sc; 75 76 node = fdt_find_node("/"); 77 if (node == NULL) 78 panic("%s: could not get fdt root node", 79 sc->sc_dev.dv_xname); 80 81 board = "unknown"; 82 if (fdt_is_compatible(node, "ti,omap4")) { 83 rev = bus_space_read_4(sc->sc_iot, sc->sc_ioh, O4_ID_CODE); 84 switch ((rev >> 12) & 0xffff) { 85 case 0xB852: 86 case 0xB95C: 87 board = "omap4430"; 88 newclockrate = 400 * 1000 * 1000; 89 break; 90 case 0xB94E: 91 board = "omap4460"; 92 newclockrate = 350 * 1000 * 1000; 93 break; 94 } 95 } 96 printf(": %s\n", board); 97 if (newclockrate != 0) 98 amptimer_set_clockrate(newclockrate); 99 } 100