diff options
Diffstat (limited to 'sys/arm64/spe/arm_spe_acpi.c')
| -rw-r--r-- | sys/arm64/spe/arm_spe_acpi.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/sys/arm64/spe/arm_spe_acpi.c b/sys/arm64/spe/arm_spe_acpi.c new file mode 100644 index 000000000000..b9f40448d940 --- /dev/null +++ b/sys/arm64/spe/arm_spe_acpi.c @@ -0,0 +1,146 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2024 Arm Ltd + * Copyright (c) 2022 The FreeBSD Foundation + * + * Portions of this software were developed by Andrew Turner under sponsorship + * from the FreeBSD Foundation. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/param.h> +#include <sys/bus.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/module.h> +#include <sys/mutex.h> + +#include <contrib/dev/acpica/include/acpi.h> +#include <dev/acpica/acpivar.h> + +#include <arm64/spe/arm_spe_dev.h> + +static device_identify_t arm_spe_acpi_identify; +static device_probe_t arm_spe_acpi_probe; + +static device_method_t arm_spe_acpi_methods[] = { + /* Device interface */ + DEVMETHOD(device_identify, arm_spe_acpi_identify), + DEVMETHOD(device_probe, arm_spe_acpi_probe), + + DEVMETHOD_END, +}; + +DEFINE_CLASS_1(spe, arm_spe_acpi_driver, arm_spe_acpi_methods, + sizeof(struct arm_spe_softc), arm_spe_driver); + +DRIVER_MODULE(spe, acpi, arm_spe_acpi_driver, 0, 0); + +struct madt_data { + u_int irq; + bool found; + bool valid; +}; + +static void +madt_handler(ACPI_SUBTABLE_HEADER *entry, void *arg) +{ + ACPI_MADT_GENERIC_INTERRUPT *intr; + struct madt_data *madt_data; + u_int irq; + + madt_data = (struct madt_data *)arg; + + /* Exit early if we are have decided to not attach */ + if (!madt_data->valid) + return; + + switch(entry->Type) { + case ACPI_MADT_TYPE_GENERIC_INTERRUPT: + intr = (ACPI_MADT_GENERIC_INTERRUPT *)entry; + irq = intr->SpeInterrupt; + + if (irq == 0) { + madt_data->valid = false; + } else if (!madt_data->found) { + madt_data->found = true; + madt_data->irq = irq; + } else if (madt_data->irq != irq) { + madt_data->valid = false; + } + break; + + default: + break; + } +} + +static void +arm_spe_acpi_identify(driver_t *driver, device_t parent) +{ + struct madt_data madt_data; + ACPI_TABLE_MADT *madt; + device_t dev; + vm_paddr_t physaddr; + + physaddr = acpi_find_table(ACPI_SIG_MADT); + if (physaddr == 0) + return; + + madt = acpi_map_table(physaddr, ACPI_SIG_MADT); + if (madt == NULL) { + device_printf(parent, "spe: Unable to map the MADT\n"); + return; + } + + madt_data.irq = 0; + madt_data.found = false; + madt_data.valid = true; + + acpi_walk_subtables(madt + 1, (char *)madt + madt->Header.Length, + madt_handler, &madt_data); + + if (!madt_data.found || !madt_data.valid) + goto out; + + MPASS(madt_data.irq != 0); + + dev = BUS_ADD_CHILD(parent, 0, "spe", -1); + if (dev == NULL) { + device_printf(parent, "add spe child failed\n"); + goto out; + } + + BUS_SET_RESOURCE(parent, dev, SYS_RES_IRQ, 0, madt_data.irq, 1); + +out: + acpi_unmap_table(madt); +} + +static int +arm_spe_acpi_probe(device_t dev) +{ + device_set_desc(dev, "ARM Statistical Profiling Extension"); + return (BUS_PROBE_NOWILDCARD); +} |