reset: MedaiTek: add reset controller driver for MediaTek SoCs

This patch adds reset controller driver for MediaTek SoCs.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>

diff --git a/arch/arm/include/asm/arch-mediatek/reset.h b/arch/arm/include/asm/arch-mediatek/reset.h
new file mode 100644 (file)
index 0000000..9704666
--- /dev/null
+++ b/arch/arm/include/asm/arch-mediatek/reset.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2018 MediaTek Inc.
+ */
+
+#ifndef __MEDIATEK_RESET_H
+#define __MEDIATEK_RESET_H
+
+#include <dm.h>
+
+int mediatek_reset_bind(struct udevice *pdev, u32 regofs, u32 num_regs);
+
+#endif /* __MEDIATEK_RESET_H */

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 9c5208b7da52d03d9cde0d0338e06ae338e2c7ab..3a6d61f440cda46cb80d16c67757666552d4be99 100644 (file)
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -106,4 +106,11 @@ config RESET_SOCFPGA
        help
          Support for reset controller on SoCFPGA platform.
 
+config RESET_MEDIATEK
+       bool "Reset controller driver for MediaTek SoCs"
+       depends on DM_RESET && ARCH_MEDIATEK && CLK
+       default y
+       help
+         Support for reset controller on MediaTek SoCs.
+
 endmenu

diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index f4520878b7c7878c82b7bd1c91ccd446fd8141e8..8a4dcab8f6472d39eb5b80c32581f5167464499a 100644 (file)
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -17,3 +17,4 @@ obj-$(CONFIG_AST2500_RESET) += ast2500-reset.o
 obj-$(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

diff --git a/drivers/reset/reset-mediatek.c b/drivers/reset/reset-mediatek.c
new file mode 100644 (file)
index 0000000..e3614e6
--- /dev/null
+++ b/drivers/reset/reset-mediatek.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 MediaTek Inc.
+ *
+ * Author: Ryder Lee <ryder.lee@mediatek.com>
+ *        Weijie Gao <weijie.gao@mediatek.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/lists.h>
+#include <regmap.h>
+#include <reset-uclass.h>
+#include <syscon.h>
+
+struct mediatek_reset_priv {
+       struct regmap *regmap;
+       u32 regofs;
+       u32 nr_resets;
+};
+
+static int mediatek_reset_request(struct reset_ctl *reset_ctl)
+{
+       return 0;
+}
+
+static int mediatek_reset_free(struct reset_ctl *reset_ctl)
+{
+       return 0;
+}
+
+static int mediatek_reset_assert(struct reset_ctl *reset_ctl)
+{
+       struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+       int id = reset_ctl->id;
+
+       if (id >= priv->nr_resets)
+               return -EINVAL;
+
+       return regmap_update_bits(priv->regmap,
+               priv->regofs + ((id / 32) << 2), BIT(id % 32), BIT(id % 32));
+}
+
+static int mediatek_reset_deassert(struct reset_ctl *reset_ctl)
+{
+       struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+       int id = reset_ctl->id;
+
+       if (id >= priv->nr_resets)
+               return -EINVAL;
+
+       return regmap_update_bits(priv->regmap,
+               priv->regofs + ((id / 32) << 2), BIT(id % 32), 0);
+}
+
+struct reset_ops mediatek_reset_ops = {
+       .request = mediatek_reset_request,
+       .free = mediatek_reset_free,
+       .rst_assert = mediatek_reset_assert,
+       .rst_deassert = mediatek_reset_deassert,
+};
+
+static int mediatek_reset_probe(struct udevice *dev)
+{
+       struct mediatek_reset_priv *priv = dev_get_priv(dev);
+
+       if (!priv->regofs && !priv->nr_resets)
+               return -EINVAL;
+
+       priv->regmap = syscon_node_to_regmap(dev_ofnode(dev));
+       if (IS_ERR(priv->regmap))
+               return PTR_ERR(priv->regmap);
+
+       return 0;
+}
+
+int mediatek_reset_bind(struct udevice *pdev, u32 regofs, u32 num_regs)
+{
+       struct udevice *rst_dev;
+       struct mediatek_reset_priv *priv;
+       int ret;
+
+       ret = device_bind_driver_to_node(pdev, "mediatek_reset", "reset",
+                                        dev_ofnode(pdev), &rst_dev);
+       if (ret)
+               return ret;
+
+       priv = malloc(sizeof(struct mediatek_reset_priv));
+       priv->regofs = regofs;
+       priv->nr_resets = num_regs * 32;
+       rst_dev->priv = priv;
+
+       return 0;
+}
+
+U_BOOT_DRIVER(mediatek_reset) = {
+       .name = "mediatek_reset",
+       .id = UCLASS_RESET,
+       .probe = mediatek_reset_probe,
+       .ops = &mediatek_reset_ops,
+       .priv_auto_alloc_size = sizeof(struct mediatek_reset_priv),
+};

diff --git a/include/dt-bindings/reset/mtk-reset.h b/include/dt-bindings/reset/mtk-reset.h
new file mode 100644 (file)
index 0000000..5f0a74f
--- /dev/null
+++ b/include/dt-bindings/reset/mtk-reset.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2018 MediaTek Inc.
+ */
+
+#ifndef _DT_BINDINGS_MTK_RESET_H_
+#define _DT_BINDINGS_MTK_RESET_H_
+
+/* ETHSYS */
+#define ETHSYS_PPE_RST                 31
+#define ETHSYS_EPHY_RST                        24
+#define ETHSYS_GMAC_RST                        23
+#define ETHSYS_ESW_RST                 16
+#define ETHSYS_FE_RST                  6
+#define ETHSYS_MCM_RST                 2
+#define ETHSYS_SYS_RST                 0
+
+#endif /* _DT_BINDINGS_MTK_RESET_H_ */