ram: renesas: Add Renesas R-Car Gen4 DBSC5 driver
Add Renesas R-Car Gen4 DBSC5 DRAM controller driver. This driver is currently
capable of bringing LPDDR5 DRAM on Renesas R-Car V4H Whitehawk board. Further
boards can be supported by supplying board specific DRAM configuration data
via dbsc5_get_board_data(). Support for R-Car V4M is not implemented, however
the driver is already mostly prepared to support this SoC.
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/drivers/ram/renesas/dbsc5/dbsc5.c b/drivers/ram/renesas/dbsc5/dbsc5.c
new file mode 100644
index 0000000..d24b7c5
--- /dev/null
+++ b/drivers/ram/renesas/dbsc5/dbsc5.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2024 Renesas Electronics Corp.
+ */
+
+#include <asm/io.h>
+#include <dm.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <errno.h>
+#include <linux/sizes.h>
+#include <ram.h>
+#include "dbsc5.h"
+
+static int renesas_dbsc5_probe(struct udevice *dev)
+{
+ struct udevice *pdev;
+ int ret;
+
+ ret = uclass_get_device_by_name(UCLASS_RAM, "dbsc5_dram", &pdev);
+ if (ret)
+ return ret;
+
+ ret = uclass_get_device_by_name(UCLASS_NOP, "dbsc5_qos", &pdev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+int renesas_dbsc5_bind(struct udevice *dev)
+{
+ struct udevice *ramdev, *qosdev;
+ struct driver *ramdrv, *qosdrv;
+ int ret;
+
+ ramdrv = lists_driver_lookup_name("dbsc5_dram");
+ if (!ramdrv)
+ return -ENOENT;
+
+
+ qosdrv = lists_driver_lookup_name("dbsc5_qos");
+ if (!qosdrv)
+ return -ENOENT;
+
+ ret = device_bind_with_driver_data(dev, ramdrv, "dbsc5_dram",
+ dev_get_driver_data(dev),
+ dev_ofnode(dev), &ramdev);
+ if (ret)
+ return ret;
+
+ ret = device_bind_with_driver_data(dev, qosdrv, "dbsc5_qos", 0,
+ dev_ofnode(dev), &qosdev);
+ if (ret)
+ device_unbind(ramdev);
+
+ return ret;
+}
+
+struct renesas_dbsc5_data r8a779g0_dbsc5_data = {
+ .clock_node = "renesas,r8a779g0-cpg-mssr",
+ .reset_node = "renesas,r8a779g0-rst"
+};
+
+static const struct udevice_id renesas_dbsc5_ids[] = {
+ {
+ .compatible = "renesas,r8a779g0-dbsc",
+ .data = (ulong)&r8a779g0_dbsc5_data
+ },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(renesas_dbsc5) = {
+ .name = "dbsc5",
+ .id = UCLASS_NOP,
+ .of_match = renesas_dbsc5_ids,
+ .bind = renesas_dbsc5_bind,
+ .probe = renesas_dbsc5_probe,
+};