1/*	$OpenBSD: qcsdam.c,v 1.1 2023/07/22 22:43:53 patrick Exp $	*/
2/*
3 * Copyright (c) 2023 Patrick Wildt <patrick@blueri.se>
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/bus.h>
23#include <machine/fdt.h>
24
25#include <dev/fdt/spmivar.h>
26
27#include <dev/ofw/openfirm.h>
28#include <dev/ofw/ofw_misc.h>
29#include <dev/ofw/fdt.h>
30
31struct qcsdam_softc {
32	struct device		sc_dev;
33	spmi_tag_t		sc_tag;
34	int8_t			sc_sid;
35	uint16_t		sc_addr;
36
37	struct nvmem_device	sc_nd;
38};
39
40int qcsdam_match(struct device *, void *, void *);
41void qcsdam_attach(struct device *, struct device *, void *);
42
43const struct cfattach	qcsdam_ca = {
44	sizeof (struct qcsdam_softc), qcsdam_match, qcsdam_attach
45};
46
47struct cfdriver qcsdam_cd = {
48	NULL, "qcsdam", DV_DULL
49};
50
51int	qcsdam_nvmem_read(void *, bus_addr_t, void *, bus_size_t);
52int	qcsdam_nvmem_write(void *, bus_addr_t, const void *, bus_size_t);
53
54int
55qcsdam_match(struct device *parent, void *match, void *aux)
56{
57	struct spmi_attach_args *saa = aux;
58
59	return OF_is_compatible(saa->sa_node, "qcom,spmi-sdam");
60}
61
62void
63qcsdam_attach(struct device *parent, struct device *self, void *aux)
64{
65	struct qcsdam_softc *sc = (struct qcsdam_softc *)self;
66	struct spmi_attach_args *saa = aux;
67	uint32_t reg;
68
69	if (OF_getpropintarray(saa->sa_node, "reg",
70	    &reg, sizeof(reg)) != sizeof(reg)) {
71		printf(": can't find registers\n");
72		return;
73	}
74
75	sc->sc_tag = saa->sa_tag;
76	sc->sc_sid = saa->sa_sid;
77	sc->sc_addr = reg;
78
79	printf("\n");
80
81	sc->sc_nd.nd_node = saa->sa_node;
82	sc->sc_nd.nd_cookie = sc;
83	sc->sc_nd.nd_read = qcsdam_nvmem_read;
84	sc->sc_nd.nd_write = qcsdam_nvmem_write;
85	nvmem_register(&sc->sc_nd);
86}
87
88int
89qcsdam_nvmem_read(void *cookie, bus_addr_t addr, void *data, bus_size_t size)
90{
91	struct qcsdam_softc *sc = cookie;
92	int error;
93
94	error = spmi_cmd_read(sc->sc_tag, sc->sc_sid, SPMI_CMD_EXT_READL,
95	    sc->sc_addr + addr, data, size);
96	if (error) {
97		printf("%s: error reading NVMEM\n", sc->sc_dev.dv_xname);
98		return error;
99	}
100
101	return 0;
102}
103
104int
105qcsdam_nvmem_write(void *cookie, bus_addr_t addr, const void *data,
106    bus_size_t size)
107{
108	struct qcsdam_softc *sc = cookie;
109	int error;
110
111	error = spmi_cmd_write(sc->sc_tag, sc->sc_sid, SPMI_CMD_EXT_WRITEL,
112	    sc->sc_addr + addr, data, size);
113	if (error) {
114		printf("%s: error reading NVMEM\n", sc->sc_dev.dv_xname);
115		return error;
116	}
117
118	return 0;
119}
120