reset: add reset controller driver for MediaTek MIPS platform

This patch adds reset controller driver for MediaTek MIPS platform and
header file for mt7628.

Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>

3 files changed, 90 insertions, 0 deletions

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 976f3a7..cff0082 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -113,6 +113,13 @@ config RESET_MEDIATEK
 	help
 	  Support for reset controller on MediaTek SoCs.
 
+config RESET_MTMIPS
+	bool "Reset controller driver for MediaTek MIPS platform"
+	depends on DM_RESET && ARCH_MTMIPS
+	default y
+	help
+	  Support for reset controller on MediaTek MIPS platform.
+
 config RESET_SUNXI
 	bool "RESET support for Allwinner SoCs"
 	depends on DM_RESET && ARCH_SUNXI
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index f5875fc..8102d8d 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_RESET_ROCKCHIP) += reset-rockchip.o
 obj-$(CONFIG_RESET_MESON) += reset-meson.o
 obj-$(CONFIG_RESET_SOCFPGA) += reset-socfpga.o
 obj-$(CONFIG_RESET_MEDIATEK) += reset-mediatek.o
+obj-$(CONFIG_RESET_MTMIPS) += reset-mtmips.o
 obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o
 obj-$(CONFIG_RESET_HISILICON) += reset-hisilicon.o
 obj-$(CONFIG_RESET_IMX7) += reset-imx7.o
diff --git a/drivers/reset/reset-mtmips.c b/drivers/reset/reset-mtmips.c
new file mode 100644
index 0000000..5973456
--- /dev/null
+++ b/drivers/reset/reset-mtmips.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <weijie.gao@mediatek.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <reset-uclass.h>
+#include <linux/io.h>
+
+struct mtmips_reset_priv {
+	void __iomem *base;
+};
+
+static int mtmips_reset_request(struct reset_ctl *reset_ctl)
+{
+	return 0;
+}
+
+static int mtmips_reset_free(struct reset_ctl *reset_ctl)
+{
+	return 0;
+}
+
+static int mtmips_reset_assert(struct reset_ctl *reset_ctl)
+{
+	struct mtmips_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+
+	setbits_32(priv->base, BIT(reset_ctl->id));
+
+	return 0;
+}
+
+static int mtmips_reset_deassert(struct reset_ctl *reset_ctl)
+{
+	struct mtmips_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+
+	clrbits_32(priv->base, BIT(reset_ctl->id));
+
+	return 0;
+}
+
+static const struct reset_ops mtmips_reset_ops = {
+	.request	= mtmips_reset_request,
+	.free		= mtmips_reset_free,
+	.rst_assert	= mtmips_reset_assert,
+	.rst_deassert	= mtmips_reset_deassert,
+};
+
+static int mtmips_reset_probe(struct udevice *dev)
+{
+	return 0;
+}
+
+static int mtmips_reset_ofdata_to_platdata(struct udevice *dev)
+{
+	struct mtmips_reset_priv *priv = dev_get_priv(dev);
+
+	priv->base = (void __iomem *)dev_remap_addr_index(dev, 0);
+	if (!priv->base)
+		return -EINVAL;
+
+	return 0;
+}
+
+static const struct udevice_id mtmips_reset_ids[] = {
+	{ .compatible = "mediatek,mtmips-reset" },
+	{ }
+};
+
+U_BOOT_DRIVER(mtmips_reset) = {
+	.name = "mtmips-reset",
+	.id = UCLASS_RESET,
+	.of_match = mtmips_reset_ids,
+	.ofdata_to_platdata = mtmips_reset_ofdata_to_platdata,
+	.probe = mtmips_reset_probe,
+	.priv_auto_alloc_size = sizeof(struct mtmips_reset_priv),
+	.ops = &mtmips_reset_ops,
+};