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riscv: Create a newbus device for the SBI driver

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This approach is based on the Arm PSCI driver, though that makes more
extensive use of its softc than we do here. This will be used to extract
the SBI IPI code as a real PIC.

Reviewed by:	mhorne, imp
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D35900
This commit is contained in:
Jessica Clarke 2024-01-24 23:49:54 +00:00
parent 103d39efe0
commit c55272fdf8
2 changed files with 61 additions and 14 deletions
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6
sys/riscv/include/sbi.h
View file

@ -159,11 +159,7 @@ sbi_call(uint64_t arg7, uint64_t arg6, uint64_t arg0, uint64_t arg1,
return (ret);
}
/* Base extension functions and variables. */
extern u_long sbi_spec_version;
extern u_long sbi_impl_id;
extern u_long sbi_impl_version;
/* Base extension functions. */
static __inline long
sbi_probe_extension(long id)
{

69
sys/riscv/riscv/sbi.c
View file

@ -2,6 +2,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Mitchell Horne <mhorne@FreeBSD.org>
* Copyright (c) 2021 Jessica Clarke <jrtc27@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -26,10 +27,11 @@
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/bus.h>
#include <sys/eventhandler.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/reboot.h>
#include <machine/md_var.h>
@ -39,9 +41,15 @@
#define OPENSBI_VERSION_MAJOR_OFFSET 16
#define OPENSBI_VERSION_MINOR_MASK 0xFFFF
u_long sbi_spec_version;
u_long sbi_impl_id;
u_long sbi_impl_version;
struct sbi_softc {
device_t dev;
};
static struct sbi_softc *sbi_softc = NULL;
static u_long sbi_spec_version;
static u_long sbi_impl_id;
static u_long sbi_impl_version;
static bool has_time_extension = false;
static bool has_ipi_extension = false;
@ -315,10 +323,53 @@ sbi_init(void)
}
static void
sbi_late_init(void *dummy __unused)
sbi_identify(driver_t *driver, device_t parent)
{
EVENTHANDLER_REGISTER(shutdown_final, sbi_shutdown_final, NULL,
SHUTDOWN_PRI_LAST);
device_t dev;
if (device_find_child(parent, "sbi", -1) != NULL)
return;
dev = BUS_ADD_CHILD(parent, 0, "sbi", -1);
if (dev == NULL)
device_printf(parent, "Can't add sbi child\n");
}
SYSINIT(sbi, SI_SUB_KLD, SI_ORDER_ANY, sbi_late_init, NULL);
static int
sbi_probe(device_t dev)
{
device_set_desc(dev, "RISC-V Supervisor Binary Interface");
return (BUS_PROBE_NOWILDCARD);
}
static int
sbi_attach(device_t dev)
{
struct sbi_softc *sc;
if (sbi_softc != NULL)
return (ENXIO);
sc = device_get_softc(dev);
sc->dev = dev;
sbi_softc = sc;
EVENTHANDLER_REGISTER(shutdown_final, sbi_shutdown_final, NULL,
SHUTDOWN_PRI_LAST);
return (0);
}
static device_method_t sbi_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, sbi_identify),
DEVMETHOD(device_probe, sbi_probe),
DEVMETHOD(device_attach, sbi_attach),
DEVMETHOD_END
};
DEFINE_CLASS_0(sbi, sbi_driver, sbi_methods, sizeof(struct sbi_softc));
EARLY_DRIVER_MODULE(sbi, nexus, sbi_driver, 0, 0,
BUS_PASS_CPU + BUS_PASS_ORDER_FIRST);