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/* $OpenBSD: bd718x7.c,v 1.1 2020/03/20 09:25:42 patrick Exp $ */
/*
* Copyright (c) 2019 Patrick Wildt <patrick@blueri.se>
* Copyright (c) 2017 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 <sys/malloc.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_regulator.h>
#include <dev/ofw/fdt.h>
#include <dev/i2c/i2cvar.h>
#define BDPMIC_REGLOCK 0x2f
#define BDPMIC_REGLOCK_PWRSEQ (1 << 0)
#define BDPMIC_REGLOCK_VREG (1 << 4)
struct bdpmic_regdata {
const char *name;
uint8_t reg, mask;
uint32_t base, delta;
};
struct bdpmic_regdata bd71837_regdata[] = {
{ }
};
struct bdpmic_regdata bd71847_regdata[] = {
{ "BUCK2", 0x10, 0x3f, 700000, 10000 },
{ }
};
struct bdpmic_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
struct bdpmic_regdata *sc_regdata;
};
int bdpmic_match(struct device *, void *, void *);
void bdpmic_attach(struct device *, struct device *, void *);
void bdpmic_attach_regulator(struct bdpmic_softc *, int);
uint8_t bdpmic_reg_read(struct bdpmic_softc *, int);
void bdpmic_reg_write(struct bdpmic_softc *, int, uint8_t);
struct cfattach bdpmic_ca = {
sizeof(struct bdpmic_softc), bdpmic_match, bdpmic_attach
};
struct cfdriver bdpmic_cd = {
NULL, "bdpmic", DV_DULL
};
int
bdpmic_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
int node = *(int *)ia->ia_cookie;
return (OF_is_compatible(node, "rohm,bd71837") ||
OF_is_compatible(node, "rohm,bd71847"));
}
void
bdpmic_attach(struct device *parent, struct device *self, void *aux)
{
struct bdpmic_softc *sc = (struct bdpmic_softc *)self;
struct i2c_attach_args *ia = aux;
int node = *(int *)ia->ia_cookie;
const char *chip;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
if (OF_is_compatible(node, "rohm,bd71837")) {
chip = "BD71837";
sc->sc_regdata = bd71837_regdata;
} else {
chip = "BD71847";
sc->sc_regdata = bd71847_regdata;
}
printf(": %s\n", chip);
node = OF_getnodebyname(node, "regulators");
if (node == 0)
return;
for (node = OF_child(node); node; node = OF_peer(node))
bdpmic_attach_regulator(sc, node);
}
struct bdpmic_regulator {
struct bdpmic_softc *bd_sc;
uint8_t bd_reg, bd_mask;
uint32_t bd_base, bd_delta;
struct regulator_device bd_rd;
};
uint32_t bdpmic_get_voltage(void *);
int bdpmic_set_voltage(void *, uint32_t);
void
bdpmic_attach_regulator(struct bdpmic_softc *sc, int node)
{
struct bdpmic_regulator *bd;
char name[32];
int i;
name[0] = 0;
OF_getprop(node, "name", name, sizeof(name));
name[sizeof(name) - 1] = 0;
for (i = 0; sc->sc_regdata[i].name; i++) {
if (strcmp(sc->sc_regdata[i].name, name) == 0)
break;
}
if (sc->sc_regdata[i].name == NULL)
return;
bd = malloc(sizeof(*bd), M_DEVBUF, M_WAITOK | M_ZERO);
bd->bd_sc = sc;
bd->bd_reg = sc->sc_regdata[i].reg;
bd->bd_mask = sc->sc_regdata[i].mask;
bd->bd_base = sc->sc_regdata[i].base;
bd->bd_delta = sc->sc_regdata[i].delta;
bd->bd_rd.rd_node = node;
bd->bd_rd.rd_cookie = bd;
bd->bd_rd.rd_get_voltage = bdpmic_get_voltage;
bd->bd_rd.rd_set_voltage = bdpmic_set_voltage;
regulator_register(&bd->bd_rd);
}
uint32_t
bdpmic_get_voltage(void *cookie)
{
struct bdpmic_regulator *bd = cookie;
uint8_t vsel;
vsel = bdpmic_reg_read(bd->bd_sc, bd->bd_reg);
return bd->bd_base + (vsel & bd->bd_mask) * bd->bd_delta;
}
int
bdpmic_set_voltage(void *cookie, uint32_t voltage)
{
struct bdpmic_regulator *bd = cookie;
uint32_t vmin = bd->bd_base;
uint32_t vmax = vmin + bd->bd_mask * bd->bd_delta;
uint8_t vsel;
if (voltage < vmin || voltage > vmax)
return EINVAL;
/* Unlock */
bdpmic_reg_write(bd->bd_sc, BDPMIC_REGLOCK,
BDPMIC_REGLOCK_PWRSEQ);
vsel = bdpmic_reg_read(bd->bd_sc, bd->bd_reg);
vsel &= ~bd->bd_mask;
vsel |= (voltage - bd->bd_base) / bd->bd_delta;
bdpmic_reg_write(bd->bd_sc, bd->bd_reg, vsel);
/* Lock */
bdpmic_reg_write(bd->bd_sc, BDPMIC_REGLOCK,
BDPMIC_REGLOCK_PWRSEQ | BDPMIC_REGLOCK_VREG);
return 0;
}
uint8_t
bdpmic_reg_read(struct bdpmic_softc *sc, int reg)
{
uint8_t cmd = reg;
uint8_t val;
int error;
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
&cmd, sizeof cmd, &val, sizeof val, I2C_F_POLL);
iic_release_bus(sc->sc_tag, I2C_F_POLL);
if (error) {
printf("%s: can't read register 0x%02x\n",
sc->sc_dev.dv_xname, reg);
val = 0xff;
}
return val;
}
void
bdpmic_reg_write(struct bdpmic_softc *sc, int reg, uint8_t val)
{
uint8_t cmd = reg;
int error;
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
error = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
&cmd, sizeof cmd, &val, sizeof val, I2C_F_POLL);
iic_release_bus(sc->sc_tag, I2C_F_POLL);
if (error) {
printf("%s: can't write register 0x%02x\n",
sc->sc_dev.dv_xname, reg);
}
}
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