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/* $OpenBSD: rkiovd.c,v 1.1 2023/04/01 08:39:05 kettenis Exp $ */
/*
* Copyright (c) 2023 Mark Kettenis <kettenis@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_misc.h>
#include <dev/ofw/ofw_regulator.h>
#include <dev/ofw/fdt.h>
#define RK3568_PMU_GRF_IO_VSEL0 0x0140
#define RK3568_PMU_GRF_IO_VSEL1 0x0144
#define RK3568_PMU_GRF_IO_VSEL2 0x0148
#define RKIOVD_MAX_DOMAINS 9
const char *rkiovd_rk3568_domains[] = {
"pmuio1-supply",
"pmuio2-supply",
"vccio1-supply",
"vccio2-supply",
"vccio3-supply",
"vccio4-supply",
"vccio5-supply",
"vccio6-supply",
"vccio7-supply",
NULL
};
struct rkiovd_domain {
struct rkiovd_softc *rd_sc;
int rd_idx;
struct regulator_notifier rd_rn;
};
struct rkiovd_softc {
struct device sc_dv;
struct regmap *sc_rm;
struct rkiovd_domain sc_rd[RKIOVD_MAX_DOMAINS];
};
int rkiovd_match(struct device *, void *, void *);
void rkiovd_attach(struct device *, struct device *, void *);
const struct cfattach rkiovd_ca = {
sizeof (struct rkiovd_softc), rkiovd_match, rkiovd_attach
};
struct cfdriver rkiovd_cd = {
NULL, "rkiovd", DV_DULL
};
void rkiovd_rk3568_notify(void *, uint32_t);
int
rkiovd_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node,
"rockchip,rk3568-pmu-io-voltage-domain");
}
void
rkiovd_attach(struct device *parent, struct device *self, void *aux)
{
struct rkiovd_softc *sc = (struct rkiovd_softc *)self;
struct fdt_attach_args *faa = aux;
int idx;
printf("\n");
sc->sc_rm = regmap_bynode(OF_parent(faa->fa_node));
if (sc->sc_rm == NULL)
return;
for (idx = 0; rkiovd_rk3568_domains[idx]; idx++) {
struct rkiovd_domain *rd = &sc->sc_rd[idx];
char *name = (char *)rkiovd_rk3568_domains[idx];
uint32_t phandle;
phandle = OF_getpropint(faa->fa_node, name, 0);
if (phandle == 0)
continue;
rd->rd_sc = sc;
rd->rd_idx = idx;
rd->rd_rn.rn_phandle = phandle;
rd->rd_rn.rn_cookie = rd;
rd->rd_rn.rn_notify = rkiovd_rk3568_notify;
regulator_notify(&rd->rd_rn);
}
}
void
rkiovd_rk3568_notify(void *cookie, uint32_t voltage)
{
struct rkiovd_domain *rd = cookie;
struct rkiovd_softc *sc = rd->rd_sc;
uint32_t current_voltage;
uint32_t vsel0, vsel1;
int bit;
/*
* If the new voltage is higher than the current voltage we
* need to configure the I/O voltage domain before changing
* the voltage. If the new voltage is lower we need to
* configure the domain after changing the voltage. Using the
* maximum of the new and current voltage makes sure this is
* always the case.
*/
current_voltage = regulator_get_voltage(rd->rd_rn.rn_phandle);
if (voltage < current_voltage)
voltage = current_voltage;
switch (rd->rd_idx) {
case 1: /* PMUIO2 */
if (voltage > 1980000) {
vsel0 = (1 << 1) << 16 | (0 << 1);
vsel1 = (1 << 5) << 16 | (1 << 5);
} else {
vsel0 = (1 << 1) << 16 | (1 << 1);
vsel1 = (1 << 5) << 16 | (0 << 5);
}
regmap_write_4(sc->sc_rm, RK3568_PMU_GRF_IO_VSEL2, vsel0);
regmap_write_4(sc->sc_rm, RK3568_PMU_GRF_IO_VSEL2, vsel1);
break;
case 2: /* VCCIO1 */
case 4: /* VCCIO3 */
case 5: /* VCCIO4 */
case 6: /* VCCIO5 */
case 7: /* VCCIO6 */
case 8: /* VCCIO7 */
bit = rd->rd_idx - 1;
if (voltage > 1980000) {
vsel0 = (1 << bit) << 16 | (0 << bit);
vsel1 = (1 << bit) << 16 | (1 << bit);
} else {
vsel0 = (1 << bit) << 16 | (1 << bit);
vsel1 = (1 << bit) << 16 | (0 << bit);
}
regmap_write_4(sc->sc_rm, RK3568_PMU_GRF_IO_VSEL0, vsel0);
regmap_write_4(sc->sc_rm, RK3568_PMU_GRF_IO_VSEL1, vsel1);
break;
case 0: /* PMUIO1 */
case 3: /* VCCIO2 */
/* Ignore */
break;
}
}
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