The branch main has been updated by bnovkov:
URL:
https://cgit.FreeBSD.org/src/commit/?id=e07254d1483fad260dec7e2423043f544dfa85f9
commit e07254d1483fad260dec7e2423043f544dfa85f9
Author: Bojan Novković <bnov...@freebsd.org>
AuthorDate: 2025-01-18 19:11:39 +0000
Commit: Bojan Novković <bnov...@freebsd.org>
CommitDate: 2025-08-01 12:35:54 +0000
riscv: Add driver for the cvitek reboot controller
This patch adds support for the cvitek reboot controller.
This controller is present on the Milk-V riscv SoCs.
Reviewed by: br, mhorne, jrtc27
Differential review: https://reviews.freebsd.org/D48532
---
sys/riscv/cvitek/cvitek_restart.c | 158 ++++++++++++++++++++++++++++++++++++++
1 file changed, 158 insertions(+)
diff --git a/sys/riscv/cvitek/cvitek_restart.c
b/sys/riscv/cvitek/cvitek_restart.c
new file mode 100644
index 000000000000..53df126d5171
--- /dev/null
+++ b/sys/riscv/cvitek/cvitek_restart.c
@@ -0,0 +1,158 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2024 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.
+ */
+
+/*
+ * Driver for cvitek's poweroff/restart controller.
+ */
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/types.h>
+#include <sys/eventhandler.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/reboot.h>
+#include <sys/rman.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/ofw/openfirm.h>
+
+#define RTC_CTRL0_UNLOCK 0x4
+#define RTC_CTRL0_UNLOCK_KEY 0xAB18
+
+#define RTC_CTRL0 0x8
+#define RTC_CTRL0_RESERVED_MASK 0xFFFF0800
+#define RTC_CTRL0_REQ_SHUTDOWN 0x01
+#define RTC_CTRL0_REQ_POWERCYCLE 0x08
+#define RTC_CTRL0_REQ_WARM_RESET 0x10
+
+#define RTC_BASE_OFFSET 0x1000
+#define RTC_EN_SHDN_REQ (RTC_BASE_OFFSET + 0xC0)
+#define RTC_EN_PWR_CYC_REQ (RTC_BASE_OFFSET + 0xC8)
+#define RTC_EN_WARM_RST_REQ (RTC_BASE_OFFSET + 0xCC)
+
+struct cvitek_restart_softc {
+ int reg_rid;
+ struct resource *reg;
+ eventhandler_tag tag;
+};
+
+static void
+cvitek_restart_shutdown_final(device_t dev, int howto)
+{
+ struct cvitek_restart_softc *sc;
+ uint32_t val;
+
+ sc = device_get_softc(dev);
+ val = RTC_CTRL0_RESERVED_MASK;
+ if ((howto & RB_POWEROFF) != 0)
+ val |= RTC_CTRL0_REQ_SHUTDOWN;
+ else if ((howto & RB_POWERCYCLE) != 0)
+ val |= RTC_CTRL0_REQ_POWERCYCLE;
+ else
+ val |= RTC_CTRL0_REQ_WARM_RESET;
+
+ /* Unlock writes to 'rtc_ctrl0'. */
+ bus_write_4(sc->reg, RTC_CTRL0_UNLOCK, RTC_CTRL0_UNLOCK_KEY);
+ bus_write_4(sc->reg, RTC_CTRL0, val);
+ DELAY(1000);
+
+ device_printf(dev, "Poweroff request failed\n");
+}
+
+static int
+cvitek_restart_probe(device_t dev)
+{
+
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ if (ofw_bus_is_compatible(dev, "cvitek,restart")) {
+ device_set_desc(dev, "Cvitek restart controller");
+ return (BUS_PROBE_DEFAULT);
+ }
+ return (ENXIO);
+}
+
+static int
+cvitek_restart_attach(device_t dev)
+{
+ struct cvitek_restart_softc *sc;
+
+ sc = device_get_softc(dev);
+ sc->reg = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->reg_rid,
+ RF_ACTIVE);
+ if (sc->reg == NULL) {
+ device_printf(dev, "can't map RTC regs\n");
+ return (ENXIO);
+ }
+
+ /* Enable requests for various poweroff methods. */
+ bus_write_4(sc->reg, RTC_EN_SHDN_REQ, 0x1);
+ bus_write_4(sc->reg, RTC_EN_PWR_CYC_REQ, 0x1);
+ bus_write_4(sc->reg, RTC_EN_WARM_RST_REQ, 0x1);
+
+ sc->tag = EVENTHANDLER_REGISTER(shutdown_final,
+ cvitek_restart_shutdown_final, dev, SHUTDOWN_PRI_LAST);
+
+ return (0);
+}
+
+static int
+cvitek_restart_detach(device_t dev)
+{
+ struct cvitek_restart_softc *sc;
+
+ sc = device_get_softc(dev);
+ if (sc->reg == NULL)
+ return (0);
+
+ bus_write_4(sc->reg, RTC_EN_SHDN_REQ, 0x0);
+ bus_write_4(sc->reg, RTC_EN_PWR_CYC_REQ, 0x0);
+ bus_write_4(sc->reg, RTC_EN_WARM_RST_REQ, 0x0);
+
+ bus_release_resource(dev, SYS_RES_MEMORY, sc->reg_rid, sc->reg);
+ EVENTHANDLER_DEREGISTER(shutdown_final, sc->tag);
+
+ return (0);
+}
+
+static device_method_t cvitek_restart_methods[] = {
+ DEVMETHOD(device_probe, cvitek_restart_probe),
+ DEVMETHOD(device_attach, cvitek_restart_attach),
+ DEVMETHOD(device_detach, cvitek_restart_detach),
+
+ DEVMETHOD_END
+};
+
+DEFINE_CLASS_0(cvitek_restart, cvitek_restart_driver, cvitek_restart_methods,
+ sizeof(struct cvitek_restart_softc));
+DRIVER_MODULE(cvitek_restart, simplebus, cvitek_restart_driver, NULL, NULL);
