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/* $OpenBSD: amlsm.c,v 1.1 2020/01/14 20:43:20 kettenis Exp $ */
/*
* Copyright (c) 2020 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/timeout.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
#include <dev/ofw/ofw_misc.h>
#include <dev/rndvar.h>
extern register_t smc_call(register_t, register_t, register_t, register_t);
/* Calls */
#define AML_SM_GET_SHARE_MEM_INPUT_BASE 0x82000020
#define AML_SM_GET_SHARE_MEM_OUTPUT_BASE 0x82000021
#define AML_SM_EFUSE_READ 0x82000030
#define AML_SM_EFUSE_USER_MAX 0x82000033
#define AML_SM_JTAG_ON 0x82000040
#define AML_SM_JTAG_OFF 0x82000041
#define AML_SM_GET_CHIP_ID 0x82000044
struct aml_cpu_info {
uint32_t version;
uint32_t chip_id[4];
};
struct amlsm_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_in_ioh;
bus_space_handle_t sc_out_ioh;
};
int amlsm_match(struct device *, void *, void *);
void amlsm_attach(struct device *, struct device *, void *);
struct cfattach amlsm_ca = {
sizeof (struct amlsm_softc), amlsm_match, amlsm_attach
};
struct cfdriver amlsm_cd = {
NULL, "amlsm", DV_DULL
};
int
amlsm_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "amlogic,meson-gxbb-sm");
}
void
amlsm_attach(struct device *parent, struct device *self, void *aux)
{
struct amlsm_softc *sc = (struct amlsm_softc *)self;
struct fdt_attach_args *faa = aux;
struct aml_cpu_info *info;
bus_addr_t addr;
int32_t ret;
int i;
sc->sc_iot = faa->fa_iot;
addr = smc_call(AML_SM_GET_SHARE_MEM_INPUT_BASE, 0, 0, 0);
if (addr == (bus_addr_t)-1 ||
bus_space_map(sc->sc_iot, addr, PAGE_SIZE,
BUS_SPACE_MAP_CACHEABLE, &sc->sc_in_ioh)) {
printf(": can't map shared memory\n");
return;
}
addr = smc_call(AML_SM_GET_SHARE_MEM_OUTPUT_BASE, 0, 0, 0);
if (addr == (bus_addr_t)-1 ||
bus_space_map(sc->sc_iot, addr, PAGE_SIZE,
BUS_SPACE_MAP_CACHEABLE, &sc->sc_out_ioh)) {
bus_space_unmap(sc->sc_iot, sc->sc_in_ioh, PAGE_SIZE);
printf(": can't map shared memory\n");
return;
}
/*
* Version 2 gives us a 16-byte chip ID. If that fails, fall
* back on version 0/1 which gives us a 12-byte chipt ID.
*/
info = bus_space_vaddr(sc->sc_iot, sc->sc_out_ioh);
memset(info, 0, sizeof(struct aml_cpu_info));
ret = smc_call(AML_SM_GET_CHIP_ID, 2, 0, 0);
if (ret == -1)
ret = smc_call(AML_SM_GET_CHIP_ID, 0, 0, 0);
printf(": ver %u\n", info->version);
if (ret != -1) {
for (i = 0; i < nitems(info->chip_id); i++)
enqueue_randomness(info->chip_id[i]);
}
}
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