git: 7a9a15eaf917 - main - if_dwc: Add support for cvitek ethernet controller

The branch main has been updated by bnovkov:

URL: https://cgit.FreeBSD.org/src/commit/?id=7a9a15eaf9170e06533f20d44540ab15af9142ef

commit 7a9a15eaf9170e06533f20d44540ab15af9142ef
Author:     Bojan Novković <bnovkov@FreeBSD.org>
AuthorDate: 2025-01-18 19:10:39 +0000
Commit:     Bojan Novković <bnovkov@FreeBSD.org>
CommitDate: 2025-08-01 12:35:54 +0000

    if_dwc: Add support for cvitek ethernet controller
    
    This patch adds support for the cvitek flavor of the DWC ethernet
    controller. This controller is present on the Milk-V riscv SoCs.
    
    Reviewed by:    manu
    Differential Revision:  https://reviews.freebsd.org/D48530
---
 sys/dev/dwc/if_dwc_cvitek.c | 89 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)

diff --git a/sys/dev/dwc/if_dwc_cvitek.c b/sys/dev/dwc/if_dwc_cvitek.c
new file mode 100644
index 000000000000..fd9a844d3fd4
--- /dev/null
+++ b/sys/dev/dwc/if_dwc_cvitek.c
@@ -0,0 +1,89 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2025 Bojan Novković <bnovkov@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/socket.h>
+#include <sys/module.h>
+
+#include <net/if.h>
+
+#include <machine/bus.h>
+#include <machine/param.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/clk/clk.h>
+#include <dev/hwreset/hwreset.h>
+
+#include <dev/dwc/if_dwcvar.h>
+#include <dev/dwc/dwc1000_reg.h>
+
+#include "if_dwc_if.h"
+
+static int
+if_dwc_cvitek_probe(device_t dev)
+{
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	if (!ofw_bus_is_compatible(dev, "cvitek,ethernet"))
+		return (ENXIO);
+	device_set_desc(dev, "CVITEK Ethernet Controller");
+
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+if_dwc_cvitek_mii_clk(device_t dev)
+{
+	/*
+	 * XXX: This is a hack to get the driver working on
+	 * the Milk-V platform. For reference, the u-boot designware
+	 * driver uses the same '150_250M' clock value, but if_dwc
+	 * will not work on Milk-V hardware unless the lowest
+	 * bit of the PHY register address is always set.
+	 */
+	return (0x10 | GMAC_MII_CLK_150_250M_DIV102);
+}
+
+static device_method_t dwc_cvitek_methods[] = {
+	DEVMETHOD(device_probe,		if_dwc_cvitek_probe),
+
+	DEVMETHOD(if_dwc_mii_clk,	if_dwc_cvitek_mii_clk),
+	DEVMETHOD_END
+};
+
+extern driver_t dwc_driver;
+
+DEFINE_CLASS_1(dwc, dwc_cvitek_driver, dwc_cvitek_methods,
+    sizeof(struct dwc_softc), dwc_driver);
+DRIVER_MODULE(dwc_cvitek, simplebus, dwc_cvitek_driver, 0, 0);
+MODULE_DEPEND(dwc_cvitek, dwc, 1, 1, 1);