[RFC 15/16] reset: starfive: Add StarFive JH8100 reset driver

[Sia Jee Heng]

Add auxiliary reset driver to support StarFive JH8100 SoC.

Co-developed-by: Joshua Yeong <joshua.yeong at starfivetech.com>
Signed-off-by: Joshua Yeong <joshua.yeong at starfivetech.com>
Signed-off-by: Sia Jee Heng <jeeheng.sia at starfivetech.com>
Reviewed-by: Ley Foon Tan <leyfoon.tan at starfivetech.com>
---
 MAINTAINERS                                   |   7 ++
 drivers/reset/starfive/Kconfig                |   8 ++
 drivers/reset/starfive/Makefile               |   2 +
 .../reset/starfive/reset-starfive-jh8100.c    | 108 ++++++++++++++++++
 4 files changed, 125 insertions(+)
 create mode 100644 drivers/reset/starfive/reset-starfive-jh8100.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 1ea4a694ed31..96fbe3259356 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20692,6 +20692,13 @@ F:	Documentation/devicetree/bindings/clock/starfive,jh81*.yaml
 F:	drivers/clk/starfive/clk-starfive-jh81*
 F:	include/dt-bindings/clock/starfive?jh81*.h
 
+STARFIVE JH8100 RESET CONTROLLER DRIVERS
+M:	Sia Jee Heng <jeeheng.sia at starfivetech.com>
+M:	Ley Foon Tan <leyfoon.tan at starfivetech.com>
+S:	Maintained
+F:	drivers/reset/starfive/reset-starfive-jh81*
+F:	include/dt-bindings/reset/starfive?jh81*.h
+
 STATIC BRANCH/CALL
 M:	Peter Zijlstra <peterz at infradead.org>
 M:	Josh Poimboeuf <jpoimboe at kernel.org>
diff --git a/drivers/reset/starfive/Kconfig b/drivers/reset/starfive/Kconfig
index 29fbcf1a7d83..88d050044d52 100644
--- a/drivers/reset/starfive/Kconfig
+++ b/drivers/reset/starfive/Kconfig
@@ -19,3 +19,11 @@ config RESET_STARFIVE_JH7110
 	default ARCH_STARFIVE
 	help
 	  This enables the reset controller driver for the StarFive JH7110 SoC.
+
+config RESET_STARFIVE_JH8100
+	bool "StarFive JH8100 Reset Driver"
+	depends on AUXILIARY_BUS && CLK_STARFIVE_JH8100_SYS
+	select RESET_STARFIVE_COMMON
+	default ARCH_STARFIVE
+	help
+	  This enables the reset controller driver for the StarFive JH8100 SoC.
diff --git a/drivers/reset/starfive/Makefile b/drivers/reset/starfive/Makefile
index 582e4c160bd4..ede1fc1c9601 100644
--- a/drivers/reset/starfive/Makefile
+++ b/drivers/reset/starfive/Makefile
@@ -3,3 +3,5 @@ obj-$(CONFIG_RESET_STARFIVE_COMMON)		+= reset-starfive-common.o
 
 obj-$(CONFIG_RESET_STARFIVE_JH7100)		+= reset-starfive-jh7100.o
 obj-$(CONFIG_RESET_STARFIVE_JH7110)		+= reset-starfive-jh7110.o
+
+obj-$(CONFIG_RESET_STARFIVE_JH8100)		+= reset-starfive-jh8100.o
diff --git a/drivers/reset/starfive/reset-starfive-jh8100.c b/drivers/reset/starfive/reset-starfive-jh8100.c
new file mode 100644
index 000000000000..a14418653608
--- /dev/null
+++ b/drivers/reset/starfive/reset-starfive-jh8100.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Reset driver for the StarFive JH8100 SoC
+ *
+ * Copyright (C) 2023 StarFive Technology Co., Ltd.
+ */
+
+#include <dt-bindings/reset/starfive,jh8100-crg.h>
+#include <linux/auxiliary_bus.h>
+#include <soc/starfive/reset-starfive-common.h>
+
+#include "reset-starfive-common.h"
+
+#define JH8100_SYSRST_NUM_RESETS	(JH8100_SYSRST_HD_AUDIO + 1)
+#define JH8100_NWRST_NUM_RESETS		(JH8100_NWRST_MERAK1_TVSENSOR + 1)
+#define JH8100_NERST_NUM_RESETS		(JH8100_NERST_DUBHE_TVSENSOR + 1)
+#define JH8100_SWRST_NUM_RESETS		(JH8100_SWRST_DDR_TVSENSOR + 1)
+#define JH8100_AONRST_NUM_RESETS	(JH8100_AONRST_IRQ_CTRL + 1)
+
+struct jh8100_reset_info {
+	unsigned int nr_resets;
+	unsigned int assert_offset;
+	unsigned int status_offset;
+};
+
+static const struct jh8100_reset_info jh8100_sys_info = {
+	.nr_resets = JH8100_SYSRST_NUM_RESETS,
+	.assert_offset = 0x1B4,
+	.status_offset = 0x1B8,
+};
+
+static const struct jh8100_reset_info jh8100_sys_nw_info = {
+	.nr_resets = JH8100_NWRST_NUM_RESETS,
+	.assert_offset = 0xA4,
+	.status_offset = 0xA8,
+};
+
+static const struct jh8100_reset_info jh8100_sys_ne_info = {
+	.nr_resets = JH8100_NERST_NUM_RESETS,
+	.assert_offset = 0x2BC,
+	.status_offset = 0x2C4,
+};
+
+static const struct jh8100_reset_info jh8100_sys_sw_info = {
+	.nr_resets = JH8100_SWRST_NUM_RESETS,
+	.assert_offset = 0x28,
+	.status_offset = 0x2C,
+};
+
+static const struct jh8100_reset_info jh8100_aon_info = {
+	.nr_resets = JH8100_AONRST_NUM_RESETS,
+	.assert_offset = 0x104,
+	.status_offset = 0x108,
+};
+
+static int jh8100_reset_probe(struct auxiliary_device *adev,
+			      const struct auxiliary_device_id *id)
+{
+	struct jh8100_reset_info *info = (struct jh8100_reset_info *)
+					 (id->driver_data);
+	struct starfive_reset_adev *rdev = to_starfive_reset_adev(adev);
+	void __iomem *base = rdev->base;
+
+	if (!info || !base)
+		return -ENODEV;
+
+	return reset_starfive_register(&adev->dev,
+					      adev->dev.parent->of_node,
+					      base + info->assert_offset,
+					      base + info->status_offset, NULL,
+					      info->nr_resets, NULL);
+}
+
+static const struct auxiliary_device_id jh8100_reset_ids[] = {
+	{
+		.name = "clk_starfive_jh8100_sys.rst-sys",
+		.driver_data = (kernel_ulong_t)&jh8100_sys_info,
+	},
+	{
+		.name = "clk_starfive_jh8100_sys.rst-nw",
+		.driver_data = (kernel_ulong_t)&jh8100_sys_nw_info,
+	},
+	{
+		.name = "clk_starfive_jh8100_sys.rst-ne",
+		.driver_data = (kernel_ulong_t)&jh8100_sys_ne_info,
+	},
+	{
+		.name = "clk_starfive_jh8100_sys.rst-sw",
+		.driver_data = (kernel_ulong_t)&jh8100_sys_sw_info,
+	},
+	{
+		.name = "clk_starfive_jh8100_sys.rst-aon",
+		.driver_data = (kernel_ulong_t)&jh8100_aon_info,
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(auxiliary, jh8100_reset_ids);
+
+static struct auxiliary_driver jh8100_reset_driver = {
+	.probe		= jh8100_reset_probe,
+	.id_table	= jh8100_reset_ids,
+};
+module_auxiliary_driver(jh8100_reset_driver);
+
+MODULE_AUTHOR("Joshua Yeong <joshua.yeong at starfivetech.com>");
+MODULE_AUTHOR("Sia Jee Heng <jeeheng.sia at starfivetech.com>");
+MODULE_DESCRIPTION("StarFive JH8100 reset driver");
+MODULE_LICENSE("GPL");
-- 
2.34.1