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/* $OpenBSD: scmi.c,v 1.1 2023/02/13 19:26:15 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/device.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_clock.h>
#include <dev/ofw/fdt.h>
#include <dev/fdt/pscivar.h>
struct scmi_shmem {
uint32_t reserved1;
uint32_t channel_status;
#define SCMI_CHANNEL_ERROR (1 << 1)
#define SCMI_CHANNEL_FREE (1 << 0)
uint32_t reserved2;
uint32_t reserved3;
uint32_t channel_flags;
uint32_t length;
uint32_t message_header;
uint32_t message_payload[];
};
#define SCMI_SUCCESS 0
#define SCMI_NOT_SUPPORTED -1
#define SCMI_BUSY -6
#define SCMI_COMMS_ERROR -7
/* Protocols */
#define SCMI_BASE 0x10
#define SCMI_CLOCK 0x14
/* Common messages */
#define SCMI_PROTOCOL_VERSION 0x0
#define SCMI_PROTOCOL_ATTRIBUTES 0x1
#define SCMI_PROTOCOL_MESSAGE_ATTRIBUTES 0x2
/* Clock management messages */
#define SCMI_CLOCK_ATTRIBUTES 0x3
#define SCMI_CLOCK_DESCRIBE_RATES 0x4
#define SCMI_CLOCK_RATE_SET 0x5
#define SCMI_CLOCK_RATE_GET 0x6
#define SCMI_CLOCK_CONFIG_SET 0x7
#define SCMI_CLOCK_CONFIG_SET_ENABLE (1 << 0)
static inline void
scmi_message_header(volatile struct scmi_shmem *shmem,
uint32_t protocol_id, uint32_t message_id)
{
shmem->message_header = (protocol_id << 10) | (message_id << 0);
}
struct scmi_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
volatile struct scmi_shmem *sc_shmem;
uint32_t sc_smc_id;
struct clock_device sc_cd;
};
int scmi_match(struct device *, void *, void *);
void scmi_attach(struct device *, struct device *, void *);
const struct cfattach scmi_ca = {
sizeof(struct scmi_softc), scmi_match, scmi_attach
};
struct cfdriver scmi_cd = {
NULL, "scmi", DV_DULL
};
void scmi_attach_proto(struct scmi_softc *, int);
void scmi_attach_clock(struct scmi_softc *, int);
int32_t scmi_command(struct scmi_softc *);
int
scmi_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "arm,scmi-smc");
}
void
scmi_attach(struct device *parent, struct device *self, void *aux)
{
struct scmi_softc *sc = (struct scmi_softc *)self;
volatile struct scmi_shmem *shmem;
struct fdt_attach_args *faa = aux;
struct fdt_reg reg;
int32_t status;
uint32_t version;
uint32_t phandle;
void *node;
int proto;
phandle = OF_getpropint(faa->fa_node, "shmem", 0);
node = fdt_find_phandle(phandle);
if (node == NULL || !fdt_is_compatible(node, "arm,scmi-shmem") ||
fdt_get_reg(node, 0, ®)) {
printf(": no shared memory\n");
return;
}
sc->sc_smc_id = OF_getpropint(faa->fa_node, "arm,smc-id", 0);
if (sc->sc_smc_id == 0) {
printf(": no SMC id\n");
return;
}
sc->sc_iot = faa->fa_iot;
if (bus_space_map(sc->sc_iot, reg.addr,
reg.size, 0, &sc->sc_ioh)) {
printf(": can't map shared memory\n");
return;
}
sc->sc_shmem = bus_space_vaddr(sc->sc_iot, sc->sc_ioh);
shmem = sc->sc_shmem;
if ((shmem->channel_status & SCMI_CHANNEL_FREE) == 0) {
printf(": channel busy\n");
return;
}
scmi_message_header(shmem, SCMI_BASE, SCMI_PROTOCOL_VERSION);
shmem->length = sizeof(uint32_t);
status = scmi_command(sc);
if (status != SCMI_SUCCESS) {
printf(": protocol version command failed\n");
return;
}
version = shmem->message_payload[1];
printf(": SCMI %d.%d\n", version >> 16, version & 0xffff);
for (proto = OF_child(faa->fa_node); proto; proto = OF_peer(proto))
scmi_attach_proto(sc, proto);
}
int32_t
scmi_command(struct scmi_softc *sc)
{
volatile struct scmi_shmem *shmem = sc->sc_shmem;
int32_t status;
shmem->channel_status = 0;
status = smccc(sc->sc_smc_id, 0, 0, 0);
if (status != PSCI_SUCCESS)
return SCMI_NOT_SUPPORTED;
if ((shmem->channel_status & SCMI_CHANNEL_ERROR))
return SCMI_COMMS_ERROR;
if ((shmem->channel_status & SCMI_CHANNEL_FREE) == 0)
return SCMI_BUSY;
return shmem->message_payload[0];
}
void
scmi_attach_proto(struct scmi_softc *sc, int node)
{
switch (OF_getpropint(node, "reg", -1)) {
case SCMI_CLOCK:
scmi_attach_clock(sc, node);
break;
default:
break;
}
}
/* Clock management. */
void scmi_clock_enable(void *, uint32_t *, int);
uint32_t scmi_clock_get_frequency(void *, uint32_t *);
int scmi_clock_set_frequency(void *, uint32_t *, uint32_t);
void
scmi_attach_clock(struct scmi_softc *sc, int node)
{
volatile struct scmi_shmem *shmem = sc->sc_shmem;
int32_t status;
int nclocks;
scmi_message_header(shmem, SCMI_CLOCK, SCMI_PROTOCOL_ATTRIBUTES);
shmem->length = sizeof(uint32_t);
status = scmi_command(sc);
if (status != SCMI_SUCCESS)
return;
nclocks = shmem->message_payload[1] & 0xffff;
if (nclocks == 0)
return;
sc->sc_cd.cd_node = node;
sc->sc_cd.cd_cookie = sc;
sc->sc_cd.cd_enable = scmi_clock_enable;
sc->sc_cd.cd_get_frequency = scmi_clock_get_frequency;
sc->sc_cd.cd_set_frequency = scmi_clock_set_frequency;
clock_register(&sc->sc_cd);
}
void
scmi_clock_enable(void *cookie, uint32_t *cells, int on)
{
struct scmi_softc *sc = cookie;
volatile struct scmi_shmem *shmem = sc->sc_shmem;
uint32_t idx = cells[0];
scmi_message_header(shmem, SCMI_CLOCK, SCMI_CLOCK_CONFIG_SET);
shmem->length = 3 * sizeof(uint32_t);
shmem->message_payload[0] = idx;
shmem->message_payload[1] = on ? SCMI_CLOCK_CONFIG_SET_ENABLE : 0;
scmi_command(sc);
}
uint32_t
scmi_clock_get_frequency(void *cookie, uint32_t *cells)
{
struct scmi_softc *sc = cookie;
volatile struct scmi_shmem *shmem = sc->sc_shmem;
uint32_t idx = cells[0];
int32_t status;
scmi_message_header(shmem, SCMI_CLOCK, SCMI_CLOCK_RATE_GET);
shmem->length = 2 * sizeof(uint32_t);
shmem->message_payload[0] = idx;
status = scmi_command(sc);
if (status != SCMI_SUCCESS)
return 0;
if (shmem->message_payload[2] != 0)
return 0;
return shmem->message_payload[1];
}
int
scmi_clock_set_frequency(void *cookie, uint32_t *cells, uint32_t freq)
{
struct scmi_softc *sc = cookie;
volatile struct scmi_shmem *shmem = sc->sc_shmem;
uint32_t idx = cells[0];
int32_t status;
scmi_message_header(shmem, SCMI_CLOCK, SCMI_CLOCK_RATE_SET);
shmem->length = 5 * sizeof(uint32_t);
shmem->message_payload[0] = 0;
shmem->message_payload[1] = idx;
shmem->message_payload[2] = freq;
shmem->message_payload[3] = 0;
status = scmi_command(sc);
if (status != SCMI_SUCCESS)
return -1;
return 0;
}
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