1 /* $OpenBSD: rkiovd.c,v 1.1 2023/04/01 08:39:05 kettenis Exp $ */
2 /*
3 * Copyright (c) 2023 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
22 #include <machine/intr.h>
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/ofw_regulator.h>
29 #include <dev/ofw/fdt.h>
30
31 #define RK3568_PMU_GRF_IO_VSEL0 0x0140
32 #define RK3568_PMU_GRF_IO_VSEL1 0x0144
33 #define RK3568_PMU_GRF_IO_VSEL2 0x0148
34
35 #define RKIOVD_MAX_DOMAINS 9
36
37 const char *rkiovd_rk3568_domains[] = {
38 "pmuio1-supply",
39 "pmuio2-supply",
40 "vccio1-supply",
41 "vccio2-supply",
42 "vccio3-supply",
43 "vccio4-supply",
44 "vccio5-supply",
45 "vccio6-supply",
46 "vccio7-supply",
47 NULL
48 };
49
50 struct rkiovd_domain {
51 struct rkiovd_softc *rd_sc;
52 int rd_idx;
53 struct regulator_notifier rd_rn;
54 };
55
56 struct rkiovd_softc {
57 struct device sc_dv;
58 struct regmap *sc_rm;
59 struct rkiovd_domain sc_rd[RKIOVD_MAX_DOMAINS];
60 };
61
62 int rkiovd_match(struct device *, void *, void *);
63 void rkiovd_attach(struct device *, struct device *, void *);
64
65 const struct cfattach rkiovd_ca = {
66 sizeof (struct rkiovd_softc), rkiovd_match, rkiovd_attach
67 };
68
69 struct cfdriver rkiovd_cd = {
70 NULL, "rkiovd", DV_DULL
71 };
72
73 void rkiovd_rk3568_notify(void *, uint32_t);
74
75 int
rkiovd_match(struct device * parent,void * match,void * aux)76 rkiovd_match(struct device *parent, void *match, void *aux)
77 {
78 struct fdt_attach_args *faa = aux;
79
80 return OF_is_compatible(faa->fa_node,
81 "rockchip,rk3568-pmu-io-voltage-domain");
82 }
83
84 void
rkiovd_attach(struct device * parent,struct device * self,void * aux)85 rkiovd_attach(struct device *parent, struct device *self, void *aux)
86 {
87 struct rkiovd_softc *sc = (struct rkiovd_softc *)self;
88 struct fdt_attach_args *faa = aux;
89 int idx;
90
91 printf("\n");
92
93 sc->sc_rm = regmap_bynode(OF_parent(faa->fa_node));
94 if (sc->sc_rm == NULL)
95 return;
96
97 for (idx = 0; rkiovd_rk3568_domains[idx]; idx++) {
98 struct rkiovd_domain *rd = &sc->sc_rd[idx];
99 char *name = (char *)rkiovd_rk3568_domains[idx];
100 uint32_t phandle;
101
102 phandle = OF_getpropint(faa->fa_node, name, 0);
103 if (phandle == 0)
104 continue;
105
106 rd->rd_sc = sc;
107 rd->rd_idx = idx;
108 rd->rd_rn.rn_phandle = phandle;
109 rd->rd_rn.rn_cookie = rd;
110 rd->rd_rn.rn_notify = rkiovd_rk3568_notify;
111 regulator_notify(&rd->rd_rn);
112 }
113 }
114
115 void
rkiovd_rk3568_notify(void * cookie,uint32_t voltage)116 rkiovd_rk3568_notify(void *cookie, uint32_t voltage)
117 {
118 struct rkiovd_domain *rd = cookie;
119 struct rkiovd_softc *sc = rd->rd_sc;
120 uint32_t current_voltage;
121 uint32_t vsel0, vsel1;
122 int bit;
123
124 /*
125 * If the new voltage is higher than the current voltage we
126 * need to configure the I/O voltage domain before changing
127 * the voltage. If the new voltage is lower we need to
128 * configure the domain after changing the voltage. Using the
129 * maximum of the new and current voltage makes sure this is
130 * always the case.
131 */
132 current_voltage = regulator_get_voltage(rd->rd_rn.rn_phandle);
133 if (voltage < current_voltage)
134 voltage = current_voltage;
135
136 switch (rd->rd_idx) {
137 case 1: /* PMUIO2 */
138 if (voltage > 1980000) {
139 vsel0 = (1 << 1) << 16 | (0 << 1);
140 vsel1 = (1 << 5) << 16 | (1 << 5);
141 } else {
142 vsel0 = (1 << 1) << 16 | (1 << 1);
143 vsel1 = (1 << 5) << 16 | (0 << 5);
144 }
145 regmap_write_4(sc->sc_rm, RK3568_PMU_GRF_IO_VSEL2, vsel0);
146 regmap_write_4(sc->sc_rm, RK3568_PMU_GRF_IO_VSEL2, vsel1);
147 break;
148 case 2: /* VCCIO1 */
149 case 4: /* VCCIO3 */
150 case 5: /* VCCIO4 */
151 case 6: /* VCCIO5 */
152 case 7: /* VCCIO6 */
153 case 8: /* VCCIO7 */
154 bit = rd->rd_idx - 1;
155 if (voltage > 1980000) {
156 vsel0 = (1 << bit) << 16 | (0 << bit);
157 vsel1 = (1 << bit) << 16 | (1 << bit);
158 } else {
159 vsel0 = (1 << bit) << 16 | (1 << bit);
160 vsel1 = (1 << bit) << 16 | (0 << bit);
161 }
162 regmap_write_4(sc->sc_rm, RK3568_PMU_GRF_IO_VSEL0, vsel0);
163 regmap_write_4(sc->sc_rm, RK3568_PMU_GRF_IO_VSEL1, vsel1);
164 break;
165 case 0: /* PMUIO1 */
166 case 3: /* VCCIO2 */
167 /* Ignore */
168 break;
169 }
170 }
171