[PATCH v3 11/11] reset: starfive: Add StarFive JH7110 reset driver

Hal Feng
2022-12-20T00:57:54Z

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

Signed-off-by: Hal Feng <hal.feng@starfivetech.com>
---
drivers/reset/starfive/Kconfig | 8 +++
drivers/reset/starfive/Makefile | 1 +
.../reset/starfive/reset-starfive-jh7110.c | 64 +++++++++++++++++++
.../reset/starfive/reset-starfive-jh71x0.h | 6 ++
4 files changed, 79 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..74bbc79f86af
--- /dev/null
+++ b/drivers/reset/starfive/reset-starfive-jh7110.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Reset driver for the StarFive JH7110 SoC
+ *
+ * Copyright (C) 2022 StarFive Technology Co., Ltd.
+ */
+
+#include <linux/auxiliary_bus.h>
+
+#include "reset-starfive-jh71x0.h"
+
+#include <dt-bindings/reset/starfive,jh7110-crg.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,
+ NULL,
+ info->nr_resets,
+ NULL);
+}
+
+static const struct reset_info jh7110_sys_info = {
+ .nr_resets = JH7110_SYSRST_END,
+ .assert_offset = 0x2F8,
+ .status_offset = 0x308,
+};
+
+static const struct reset_info jh7110_aon_info = {
+ .nr_resets = JH7110_AONRST_END,
+ .assert_offset = 0x38,
+ .status_offset = 0x3C,
+};
+
+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_AUTHOR("Hal Feng <hal.feng@starfivetech.com>");
+MODULE_DESCRIPTION("StarFive JH7110 reset driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/reset/starfive/reset-starfive-jh71x0.h b/drivers/reset/starfive/reset-starfive-jh71x0.h
index db7d39a87f87..e485472e1adc 100644
--- a/drivers/reset/starfive/reset-starfive-jh71x0.h
+++ b/drivers/reset/starfive/reset-starfive-jh71x0.h
@@ -6,6 +6,12 @@
#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;
+};
+
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