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/* $OpenBSD: sfcc.c,v 1.1 2021/05/05 19:26:51 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/cpufunc.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
/* Registers. */
#define SFCC_FLUSH64 0x200
struct sfcc_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
uint32_t sc_line_size;
};
struct sfcc_softc *sfcc_sc;
int sfcc_match(struct device *, void *, void *);
void sfcc_attach(struct device *, struct device *, void *);
const struct cfattach sfcc_ca = {
sizeof (struct sfcc_softc), sfcc_match, sfcc_attach
};
struct cfdriver sfcc_cd = {
NULL, "sfcc", DV_DULL
};
void sfcc_cache_wbinv_range(vaddr_t, vsize_t);
int
sfcc_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "sifive,fu540-c000-ccache");
}
void
sfcc_attach(struct device *parent, struct device *self, void *aux)
{
struct sfcc_softc *sc = (struct sfcc_softc *)self;
struct fdt_attach_args *faa = aux;
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_line_size = OF_getpropint(faa->fa_node, "cache-block-size", 64);
sfcc_sc = sc;
/*
* Cache lines can only be flushed, so we use the same
* operation everywhere.
*/
cpu_dcache_wbinv_range = sfcc_cache_wbinv_range;
cpu_dcache_inv_range = sfcc_cache_wbinv_range;
cpu_dcache_wb_range = sfcc_cache_wbinv_range;
}
void
sfcc_cache_wbinv_range(paddr_t pa, paddr_t len)
{
struct sfcc_softc *sc = sfcc_sc;
len += pa & (sc->sc_line_size - 1);
pa &= ~(sc->sc_line_size - 1);
__asm volatile ("fence iorw,iorw" ::: "memory");
while (len > 0) {
bus_space_write_8(sc->sc_iot, sc->sc_ioh, SFCC_FLUSH64, pa);
__asm volatile ("fence iorw,iorw" ::: "memory");
pa += sc->sc_line_size;
len -= sc->sc_line_size;
}
}
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