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
31 struct 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
40 int qcsdam_match(struct device *, void *, void *);
41 void qcsdam_attach(struct device *, struct device *, void *);
42
43 const struct cfattach qcsdam_ca = {
44 sizeof (struct qcsdam_softc), qcsdam_match, qcsdam_attach
45 };
46
47 struct cfdriver qcsdam_cd = {
48 NULL, "qcsdam", DV_DULL
49 };
50
51 int qcsdam_nvmem_read(void *, bus_addr_t, void *, bus_size_t);
52 int qcsdam_nvmem_write(void *, bus_addr_t, const void *, bus_size_t);
53
54 int
qcsdam_match(struct device * parent,void * match,void * aux)55 qcsdam_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
62 void
qcsdam_attach(struct device * parent,struct device * self,void * aux)63 qcsdam_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 ®, 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
88 int
qcsdam_nvmem_read(void * cookie,bus_addr_t addr,void * data,bus_size_t size)89 qcsdam_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
104 int
qcsdam_nvmem_write(void * cookie,bus_addr_t addr,const void * data,bus_size_t size)105 qcsdam_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