1/*	$OpenBSD: aplrtk.c,v 1.3 2022/11/09 19:18:11 kettenis Exp $	*/
2/*
3 * Copyright (c) 2022 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#include <sys/malloc.h>
22
23#include <machine/bus.h>
24#include <machine/fdt.h>
25
26#include <dev/ofw/openfirm.h>
27#include <dev/ofw/ofw_misc.h>
28#include <dev/ofw/fdt.h>
29
30#include <arm64/dev/rtkit.h>
31
32#define CPU_CTRL		0x0044
33#define CPU_CTRL_RUN		(1 << 4)
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
40struct aplrtk_softc {
41	struct device		sc_dev;
42	bus_space_tag_t		sc_iot;
43	bus_space_handle_t	sc_ioh;
44	bus_dma_tag_t		sc_dmat;
45
46	int			sc_node;
47	uint32_t		sc_phandle;
48
49	struct rtkit		sc_rtkit;
50	struct rtkit_state	*sc_state;
51};
52
53int	aplrtk_match(struct device *, void *, void *);
54void	aplrtk_attach(struct device *, struct device *, void *);
55
56const struct cfattach aplrtk_ca = {
57	sizeof (struct aplrtk_softc), aplrtk_match, aplrtk_attach
58};
59
60struct cfdriver aplrtk_cd = {
61	NULL, "aplrtk", DV_DULL
62};
63
64int
65aplrtk_match(struct device *parent, void *match, void *aux)
66{
67	struct fdt_attach_args *faa = aux;
68
69	return OF_is_compatible(faa->fa_node, "apple,rtk-helper-asc4");
70}
71
72void
73aplrtk_attach(struct device *parent, struct device *self, void *aux)
74{
75	struct aplrtk_softc *sc = (struct aplrtk_softc *)self;
76	struct fdt_attach_args *faa = aux;
77
78	if (faa->fa_nreg < 1) {
79		printf(": no registers\n");
80		return;
81	}
82
83	sc->sc_iot = faa->fa_iot;
84	if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
85	    faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
86		printf(": can't map registers\n");
87		return;
88	}
89
90	sc->sc_dmat = faa->fa_dmat;
91	sc->sc_node = faa->fa_node;
92	sc->sc_phandle = OF_getpropint(faa->fa_node, "phandle", 0);
93
94	printf("\n");
95}
96
97int
98aplrtk_do_start(struct aplrtk_softc *sc)
99{
100	uint32_t ctrl;
101	int error;
102
103	ctrl = HREAD4(sc, CPU_CTRL);
104	HWRITE4(sc, CPU_CTRL, ctrl | CPU_CTRL_RUN);
105
106	sc->sc_rtkit.rk_cookie = sc;
107	sc->sc_rtkit.rk_dmat = sc->sc_dmat;
108	sc->sc_state = rtkit_init(sc->sc_node, NULL, 0, &sc->sc_rtkit);
109	if (sc->sc_state == NULL)
110		return EIO;
111
112	error = rtkit_boot(sc->sc_state);
113	if (error)
114		return error;
115
116	return rtkit_set_ap_pwrstate(sc->sc_state, RTKIT_MGMT_PWR_STATE_ON);
117}
118
119int
120aplrtk_start(uint32_t phandle)
121{
122	struct aplrtk_softc *sc;
123	int i;
124
125	for (i = 0; i < aplrtk_cd.cd_ndevs; i++) {
126		sc = aplrtk_cd.cd_devs[i];
127		if (sc == NULL)
128			continue;
129		if (sc->sc_phandle == phandle)
130			return aplrtk_do_start(sc);
131	}
132
133	return ENXIO;
134}
135