linux-kernel - [PATCH v2 13/14] reset: starfive: Add StarFive JH7110 reset driver

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Date:   Fri, 18 Nov 2022 09:06:26 +0800
From:   Hal Feng <hal.feng@...rfivetech.com>
To:     <linux-riscv@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-clk@...r.kernel.org>
CC:     Conor Dooley <conor@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        "Rob Herring" <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        "Michael Turquette" <mturquette@...libre.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        Hal Feng <hal.feng@...rfivetech.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 13/14] reset: starfive: Add StarFive JH7110 reset driver

Add auxiliary driver to support StarFive JH7110 system
and always-on resets.

Signed-off-by: Hal Feng <hal.feng@...rfivetech.com>
---
 drivers/reset/starfive/Kconfig                |  8 +++
 drivers/reset/starfive/Makefile               |  1 +
 .../reset/starfive/reset-starfive-jh7110.c    | 67 +++++++++++++++++++
 .../reset/starfive/reset-starfive-jh71x0.h    |  7 ++
 4 files changed, 83 insertions(+)
 create mode 100644 drivers/reset/starfive/reset-starfive-jh7110.c

diff --git a/drivers/reset/starfive/Kconfig b/drivers/reset/starfive/Kconfig
index 9d15c4110e40..fab1a081af17 100644
--- a/drivers/reset/starfive/Kconfig
+++ b/drivers/reset/starfive/Kconfig
@@ -10,3 +10,11 @@ config RESET_STARFIVE_JH7100
 	default SOC_STARFIVE
 	help
 	  This enables the reset controller driver for the StarFive JH7100 SoC.
+
+config RESET_STARFIVE_JH7110
+	bool "StarFive JH7110 Reset Driver"
+	depends on AUXILIARY_BUS && CLK_STARFIVE_JH7110_SYS
+	select RESET_STARFIVE_JH71X0
+	default CLK_STARFIVE_JH7110_SYS
+	help
+	  This enables the reset controller driver for the StarFive JH7110 SoC.
diff --git a/drivers/reset/starfive/Makefile b/drivers/reset/starfive/Makefile
index f6aa12466fad..7a44b66fb9d5 100644
--- a/drivers/reset/starfive/Makefile
+++ b/drivers/reset/starfive/Makefile
@@ -2,3 +2,4 @@
 obj-$(CONFIG_RESET_STARFIVE_JH71X0)		+= reset-starfive-jh71x0.o
 
 obj-$(CONFIG_RESET_STARFIVE_JH7100)		+= reset-starfive-jh7100.o
+obj-$(CONFIG_RESET_STARFIVE_JH7110)		+= reset-starfive-jh7110.o
diff --git a/drivers/reset/starfive/reset-starfive-jh7110.c b/drivers/reset/starfive/reset-starfive-jh7110.c
new file mode 100644
index 000000000000..00f3b4ecfb02
--- /dev/null
+++ b/drivers/reset/starfive/reset-starfive-jh7110.c
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Reset driver for the StarFive JH7110 SoC
+ *
+ * Copyright (C) 2022 StarFive Technology Co., Ltd.
+ * Copyright (C) 2022 Hal Feng <hal.feng@...rfivetech.com>
+ */
+
+#include <linux/auxiliary_bus.h>
+
+#include "reset-starfive-jh71x0.h"
+
+#include <dt-bindings/reset/starfive-jh7110.h>
+
+static int jh7110_reset_probe(struct auxiliary_device *adev,
+			      const struct auxiliary_device_id *id)
+{
+	struct reset_info *info = (struct reset_info *)(id->driver_data);
+	void __iomem *base = dev_get_drvdata(adev->dev.parent);
+
+	if (!info || !base)
+		return -ENODEV;
+
+	return reset_starfive_jh71x0_register(&adev->dev, adev->dev.parent->of_node,
+					      base + info->assert_offset,
+					      base + info->status_offset,
+					      info->asserted,
+					      info->nr_resets,
+					      false);
+}
+
+static const struct reset_info jh7110_sys_info = {
+	.nr_resets = JH7110_SYSRST_END,
+	.assert_offset = 0x2F8,
+	.status_offset = 0x308,
+	.asserted = NULL,
+};
+
+static const struct reset_info jh7110_aon_info = {
+	.nr_resets = JH7110_AONRST_END,
+	.assert_offset = 0x38,
+	.status_offset = 0x3C,
+	.asserted = NULL,
+};
+
+static const struct auxiliary_device_id jh7110_reset_ids[] = {
+	{
+		.name = "clk_starfive_jh71x0.reset-sys",
+		.driver_data = (kernel_ulong_t)&jh7110_sys_info,
+	},
+	{
+		.name = "clk_starfive_jh71x0.reset-aon",
+		.driver_data = (kernel_ulong_t)&jh7110_aon_info,
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(auxiliary, jh7110_reset_ids);
+
+static struct auxiliary_driver jh7110_reset_driver = {
+	.probe		= jh7110_reset_probe,
+	.id_table	= jh7110_reset_ids,
+};
+module_auxiliary_driver(jh7110_reset_driver);
+
+MODULE_DESCRIPTION("StarFive JH7110 Reset Driver");
+MODULE_AUTHOR("Hal Feng <hal.feng@...rfivetech.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/reset/starfive/reset-starfive-jh71x0.h b/drivers/reset/starfive/reset-starfive-jh71x0.h
index e6b27110de48..63a94ee1b395 100644
--- a/drivers/reset/starfive/reset-starfive-jh71x0.h
+++ b/drivers/reset/starfive/reset-starfive-jh71x0.h
@@ -6,6 +6,13 @@
 #ifndef __RESET_STARFIVE_JH71X0_H
 #define __RESET_STARFIVE_JH71X0_H
 
+struct reset_info {
+	unsigned int nr_resets;
+	unsigned int assert_offset;
+	unsigned int status_offset;
+	const u32 *asserted;
+};
+
 int reset_starfive_jh71x0_register(struct device *dev, struct device_node *of_node,
 				   void __iomem *assert, void __iomem *status,
 				   const u32 *asserted, unsigned int nr_resets,
-- 
2.38.1