The branch main has been updated by bnovkov:
URL:
https://cgit.FreeBSD.org/src/commit/?id=25b9b0b6bec9b4a382a16586a6eb8e57944e8d25
commit 25b9b0b6bec9b4a382a16586a6eb8e57944e8d25
Author: Bojan Novković <bnov...@freebsd.org>
AuthorDate: 2025-01-18 19:11:14 +0000
Commit: Bojan Novković <bnov...@freebsd.org>
CommitDate: 2025-08-01 12:35:54 +0000
riscv: Add driver for cvitek reset controller
This patch adds support for the cvitek reset controller.
This controller is present on the Milk-V riscv SoCs. The controller is
currently only used by the if_dwc driver.
Differential Revision: https://reviews.freebsd.org/D48531
Reviewed by: jrtc27, br
---
sys/riscv/cvitek/cvitek_reset.c | 132 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 132 insertions(+)
diff --git a/sys/riscv/cvitek/cvitek_reset.c b/sys/riscv/cvitek/cvitek_reset.c
new file mode 100644
index 000000000000..348bbc85c9a9
--- /dev/null
+++ b/sys/riscv/cvitek/cvitek_reset.c
@@ -0,0 +1,132 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2025 Bojan Novković <bnov...@freebsd.org
+ *
+ * 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/systm.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/rman.h>
+
+#include <machine/bus.h>
+#include <machine/cpu.h>
+#include <machine/bus.h>
+#include <machine/resource.h>
+
+#include <dev/hwreset/hwreset.h>
+#include <dev/syscon/syscon.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/ofw/openfirm.h>
+
+#include "syscon_if.h"
+#include "hwreset_if.h"
+
+struct cvitek_reset_softc {
+ device_t dev;
+ struct mtx mtx;
+ struct syscon *syscon;
+};
+
+static int
+cvitek_reset_probe(device_t dev)
+{
+
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ if (ofw_bus_is_compatible(dev, "cvitek,reset")) {
+ device_set_desc(dev, "CVITEK reset controller");
+ return (BUS_PROBE_DEFAULT);
+ }
+
+ return (ENXIO);
+}
+
+static int
+cvitek_reset_attach(device_t dev)
+{
+ struct cvitek_reset_softc *sc;
+ int error;
+
+ sc = device_get_softc(dev);
+ sc->dev = dev;
+
+ error = syscon_get_by_ofw_property(dev, ofw_bus_get_node(dev),
+ "syscon", &sc->syscon);
+ if (error != 0) {
+ device_printf(dev, "Couldn't get syscon handle\n");
+ return (error);
+ }
+ mtx_init(&sc->mtx, device_get_nameunit(sc->dev), NULL, MTX_DEF);
+
+ hwreset_register_ofw_provider(dev);
+
+ return (0);
+}
+
+static int
+cvitek_reset_assert(device_t dev, intptr_t id, bool reset)
+{
+ struct cvitek_reset_softc *sc;
+ uint32_t offset, val;
+ uint32_t bit;
+
+ sc = device_get_softc(dev);
+ bit = id % 32;
+ offset = id / 32;
+
+ mtx_lock(&sc->mtx);
+ val = SYSCON_READ_4(sc->syscon, offset);
+ if (reset)
+ val &= ~(1 << bit);
+ else
+ val |= (1 << bit);
+ SYSCON_WRITE_4(sc->syscon, offset, val);
+ mtx_unlock(&sc->mtx);
+
+ return (0);
+}
+
+static device_method_t cvitek_reset_methods[] = {
+ DEVMETHOD(device_probe, cvitek_reset_probe),
+ DEVMETHOD(device_attach, cvitek_reset_attach),
+
+ DEVMETHOD(hwreset_assert, cvitek_reset_assert),
+
+ DEVMETHOD_END
+};
+
+static driver_t cvitek_reset_driver = {
+ "cvitek_reset",
+ cvitek_reset_methods,
+ sizeof(struct cvitek_reset_softc)
+};
+
+DRIVER_MODULE(cvitek_reset, simplebus, cvitek_reset_driver, 0, 0);
