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/* $OpenBSD: aplspmi.c,v 1.1 2021/05/26 20:52:21 kettenis Exp $ */
/*
* Copyright (c) 2021 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/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
#include <dev/fdt/spmivar.h>
/*
* This driver is based on preliminary device tree bindings and will
* almost certainly need changes once the official bindings land in
* mainline Linux. Support for these preliminary bindings will be
* dropped as soon as official bindings are available.
*/
#define SPMI_STAT 0x00
#define SPMI_STAT_RXEMPTY (1 << 24)
#define SPMI_STAT_TXEMPTY (1 << 8)
#define SPMI_CMD 0x04
#define SPMI_CMD_ADDR(x) ((x) << 16)
#define SPMI_CMD_LAST (1 << 15)
#define SPMI_CMD_SID(x) ((x) << 8)
#define SPMI_RESP 0x08
#define SPMI_INTEN(i) (0x20 + (i) * 4)
#define SPMI_INTSTAT(i) (0x60 + (i) * 4)
#define HREAD4(sc, reg) \
(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
#define HWRITE4(sc, reg, val) \
bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
struct aplspmi_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct spmi_controller sc_tag;
};
int aplspmi_match(struct device *, void *, void *);
void aplspmi_attach(struct device *, struct device *, void *);
struct cfattach aplspmi_ca = {
sizeof (struct aplspmi_softc), aplspmi_match, aplspmi_attach
};
struct cfdriver aplspmi_cd = {
NULL, "aplspmi", DV_DULL
};
int aplspmi_print(void *, const char *);
int aplspmi_cmd_read(void *, uint8_t, uint8_t, uint16_t, void *, size_t);
int aplspmi_cmd_write(void *, uint8_t, uint8_t, uint16_t,
const void *, size_t);
int
aplspmi_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "apple,spmi");
}
void
aplspmi_attach(struct device *parent, struct device *self, void *aux)
{
struct aplspmi_softc *sc = (struct aplspmi_softc *)self;
struct fdt_attach_args *faa = aux;
struct spmi_attach_args sa;
char name[32];
uint32_t reg[2];
int node;
if (faa->fa_nreg < 1) {
printf(": no registers\n");
return;
}
sc->sc_iot = faa->fa_iot;
if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
printf(": can't map registers\n");
return;
}
printf("\n");
sc->sc_tag.sc_cookie = sc;
sc->sc_tag.sc_cmd_read = aplspmi_cmd_read;
sc->sc_tag.sc_cmd_write = aplspmi_cmd_write;
for (node = OF_child(faa->fa_node); node; node = OF_peer(node)) {
if (OF_getpropintarray(node, "reg", reg,
sizeof(reg)) != sizeof(reg))
continue;
memset(name, 0, sizeof(name));
if (OF_getprop(node, "compatible", name, sizeof(name)) == -1)
continue;
if (name[0] == '\0')
continue;
memset(&sa, 0, sizeof(sa));
sa.sa_tag = &sc->sc_tag;
sa.sa_sid = reg[0];
sa.sa_name = name;
sa.sa_node = node;
config_found(self, &sa, aplspmi_print);
}
}
int
aplspmi_print(void *aux, const char *pnp)
{
struct spmi_attach_args *sa = aux;
if (pnp != NULL)
printf("\"%s\" at %s", sa->sa_name, pnp);
printf(" sid 0x%x", sa->sa_sid);
return UNCONF;
}
int
aplspmi_read_resp(struct aplspmi_softc *sc, uint32_t *resp)
{
int retry;
for (retry = 1000; retry > 0; retry--) {
if ((HREAD4(sc, SPMI_STAT) & SPMI_STAT_RXEMPTY) == 0)
break;
delay(1);
}
if (retry == 0)
return ETIMEDOUT;
*resp = HREAD4(sc, SPMI_RESP);
return 0;
}
int
aplspmi_cmd_read(void *cookie, uint8_t sid, uint8_t cmd, uint16_t addr,
void *buf, size_t len)
{
struct aplspmi_softc *sc = cookie;
uint8_t *cbuf = buf;
uint32_t resp;
int error;
if (len == 0 || len > 8)
return EINVAL;
HWRITE4(sc, SPMI_CMD, SPMI_CMD_SID(sid) | cmd | SPMI_CMD_ADDR(addr) |
(len - 1) | SPMI_CMD_LAST);
error = aplspmi_read_resp(sc, &resp);
if (error)
return error;
while (len > 0) {
error = aplspmi_read_resp(sc, &resp);
if (error)
return error;
memcpy(cbuf, &resp, MIN(len, 4));
cbuf += MIN(len, 4);
len -= MIN(len, 4);
}
return 0;
}
int
aplspmi_cmd_write(void *cookie, uint8_t sid, uint8_t cmd, uint16_t addr,
const void *buf, size_t len)
{
struct aplspmi_softc *sc = cookie;
const uint8_t *cbuf = buf;
uint32_t data, resp;
if (len == 0 || len > 8)
return EINVAL;
HWRITE4(sc, SPMI_CMD, SPMI_CMD_SID(sid) | cmd | SPMI_CMD_ADDR(addr) |
(len - 1) | SPMI_CMD_LAST);
while (len > 0) {
memcpy(&data, cbuf, MIN(len, 4));
HWRITE4(sc, SPMI_CMD, data);
cbuf += MIN(len, 4);
len -= MIN(len, 4);
}
return aplspmi_read_resp(sc, &resp);
}
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