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From:   Hal Feng <hal.feng@starfivetech.com>
To:     <linux-riscv@lists.infradead.org>, <devicetree@vger.kernel.org>,
        <linux-clk@vger.kernel.org>
CC:     Conor Dooley <conor@kernel.org>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        "Rob Herring" <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Stephen Boyd <sboyd@kernel.org>,
        "Michael Turquette" <mturquette@baylibre.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Emil Renner Berthing <emil.renner.berthing@canonical.com>,
        Hal Feng <hal.feng@starfivetech.com>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH v2 04/14] reset: starfive: Factor out common JH71X0 reset code
Date:   Fri, 18 Nov 2022 09:06:17 +0800
Message-ID: <20221118010627.70576-5-hal.feng@starfivetech.com>
In-Reply-To: <20221118010627.70576-1-hal.feng@starfivetech.com>
References: <20221118010627.70576-1-hal.feng@starfivetech.com>
MIME-Version: 1.0
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Precedence: bulk

From: Emil Renner Berthing <kernel@esmil.dk>

The StarFive JH7100 SoC has additional reset controllers for audio and
video, but the registers follow the same structure. On the JH7110 the
reset registers don't get their own memory range, but instead follow the
clock control registers. The registers still follow the same structure
though, so let's factor out the common code to handle all these cases.

Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Co-developed-by: Hal Feng <hal.feng@starfivetech.com>
Signed-off-by: Hal Feng <hal.feng@starfivetech.com>
---
 drivers/reset/starfive/Kconfig                |   4 +
 drivers/reset/starfive/Makefile               |   2 +
 .../reset/starfive/reset-starfive-jh7100.c    | 121 ++----------------
 ...rfive-jh7100.c => reset-starfive-jh71x0.c} |  92 ++++---------
 .../reset/starfive/reset-starfive-jh71x0.h    |  14 ++
 5 files changed, 56 insertions(+), 177 deletions(-)
 copy drivers/reset/starfive/{reset-starfive-jh7100.c => reset-starfive-jh71x0.c} (50%)
 create mode 100644 drivers/reset/starfive/reset-starfive-jh71x0.h

diff --git a/drivers/reset/starfive/Kconfig b/drivers/reset/starfive/Kconfig
index cddebdba7177..9d15c4110e40 100644
--- a/drivers/reset/starfive/Kconfig
+++ b/drivers/reset/starfive/Kconfig
@@ -1,8 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
+config RESET_STARFIVE_JH71X0
+	bool
+
 config RESET_STARFIVE_JH7100
 	bool "StarFive JH7100 Reset Driver"
 	depends on SOC_STARFIVE || COMPILE_TEST
+	select RESET_STARFIVE_JH71X0
 	default SOC_STARFIVE
 	help
 	  This enables the reset controller driver for the StarFive JH7100 SoC.
diff --git a/drivers/reset/starfive/Makefile b/drivers/reset/starfive/Makefile
index 670d049423f5..f6aa12466fad 100644
--- a/drivers/reset/starfive/Makefile
+++ b/drivers/reset/starfive/Makefile
@@ -1,2 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_RESET_STARFIVE_JH71X0)		+= reset-starfive-jh71x0.o
+
 obj-$(CONFIG_RESET_STARFIVE_JH7100)		+= reset-starfive-jh7100.o
diff --git a/drivers/reset/starfive/reset-starfive-jh7100.c b/drivers/reset/starfive/reset-starfive-jh7100.c
index fc44b2fb3e03..43248e8135fd 100644
--- a/drivers/reset/starfive/reset-starfive-jh7100.c
+++ b/drivers/reset/starfive/reset-starfive-jh7100.c
@@ -5,14 +5,10 @@
  * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk>
  */
 
-#include <linux/bitmap.h>
-#include <linux/io.h>
-#include <linux/io-64-nonatomic-lo-hi.h>
-#include <linux/iopoll.h>
 #include <linux/mod_devicetable.h>
 #include <linux/platform_device.h>
-#include <linux/reset-controller.h>
-#include <linux/spinlock.h>
+
+#include "reset-starfive-jh71x0.h"
 
 #include <dt-bindings/reset/starfive-jh7100.h>
 
@@ -48,114 +44,19 @@ static const u64 jh7100_reset_asserted[2] = {
 	0,
 };
 
-struct jh7100_reset {
-	struct reset_controller_dev rcdev;
-	/* protect registers against concurrent read-modify-write */
-	spinlock_t lock;
-	void __iomem *base;
-};
-
-static inline struct jh7100_reset *
-jh7100_reset_from(struct reset_controller_dev *rcdev)
-{
-	return container_of(rcdev, struct jh7100_reset, rcdev);
-}
-
-static int jh7100_reset_update(struct reset_controller_dev *rcdev,
-			       unsigned long id, bool assert)
-{
-	struct jh7100_reset *data = jh7100_reset_from(rcdev);
-	unsigned long offset = BIT_ULL_WORD(id);
-	u64 mask = BIT_ULL_MASK(id);
-	void __iomem *reg_assert = data->base + JH7100_RESET_ASSERT0 + offset * sizeof(u64);
-	void __iomem *reg_status = data->base + JH7100_RESET_STATUS0 + offset * sizeof(u64);
-	u64 done = jh7100_reset_asserted[offset] & mask;
-	u64 value;
-	unsigned long flags;
-	int ret;
-
-	if (!assert)
-		done ^= mask;
-
-	spin_lock_irqsave(&data->lock, flags);
-
-	value = readq(reg_assert);
-	if (assert)
-		value |= mask;
-	else
-		value &= ~mask;
-	writeq(value, reg_assert);
-
-	/* if the associated clock is gated, deasserting might otherwise hang forever */
-	ret = readq_poll_timeout_atomic(reg_status, value, (value & mask) == done, 0, 1000);
-
-	spin_unlock_irqrestore(&data->lock, flags);
-	return ret;
-}
-
-static int jh7100_reset_assert(struct reset_controller_dev *rcdev,
-			       unsigned long id)
-{
-	return jh7100_reset_update(rcdev, id, true);
-}
-
-static int jh7100_reset_deassert(struct reset_controller_dev *rcdev,
-				 unsigned long id)
-{
-	return jh7100_reset_update(rcdev, id, false);
-}
-
-static int jh7100_reset_reset(struct reset_controller_dev *rcdev,
-			      unsigned long id)
-{
-	int ret;
-
-	ret = jh7100_reset_assert(rcdev, id);
-	if (ret)
-		return ret;
-
-	return jh7100_reset_deassert(rcdev, id);
-}
-
-static int jh7100_reset_status(struct reset_controller_dev *rcdev,
-			       unsigned long id)
-{
-	struct jh7100_reset *data = jh7100_reset_from(rcdev);
-	unsigned long offset = BIT_ULL_WORD(id);
-	u64 mask = BIT_ULL_MASK(id);
-	void __iomem *reg_status = data->base + JH7100_RESET_STATUS0 + offset * sizeof(u64);
-	u64 value = readq(reg_status);
-
-	return !((value ^ jh7100_reset_asserted[offset]) & mask);
-}
-
-static const struct reset_control_ops jh7100_reset_ops = {
-	.assert		= jh7100_reset_assert,
-	.deassert	= jh7100_reset_deassert,
-	.reset		= jh7100_reset_reset,
-	.status		= jh7100_reset_status,
-};
-
 static int __init jh7100_reset_probe(struct platform_device *pdev)
 {
-	struct jh7100_reset *data;
-
-	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
-
-	data->base = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(data->base))
-		return PTR_ERR(data->base);
+	void __iomem *base = devm_platform_ioremap_resource(pdev, 0);
 
-	data->rcdev.ops = &jh7100_reset_ops;
-	data->rcdev.owner = THIS_MODULE;
-	data->rcdev.nr_resets = JH7100_RSTN_END;
-	data->rcdev.dev = &pdev->dev;
-	data->rcdev.of_node = pdev->dev.of_node;
-	spin_lock_init(&data->lock);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
 
-	return devm_reset_controller_register(&pdev->dev, &data->rcdev);
+	return reset_starfive_jh7100_register(&pdev->dev, pdev->dev.of_node,
+					      base + JH7100_RESET_ASSERT0,
+					      base + JH7100_RESET_STATUS0,
+					      jh7100_reset_asserted,
+					      JH7100_RSTN_END,
+					      true);
 }
 
 static const struct of_device_id jh7100_reset_dt_ids[] = {
diff --git a/drivers/reset/starfive/reset-starfive-jh7100.c b/drivers/reset/starfive/reset-starfive-jh71x0.c
similarity index 50%
copy from drivers/reset/starfive/reset-starfive-jh7100.c
copy to drivers/reset/starfive/reset-starfive-jh71x0.c
index fc44b2fb3e03..1e230f3f9841 100644
--- a/drivers/reset/starfive/reset-starfive-jh7100.c
+++ b/drivers/reset/starfive/reset-starfive-jh71x0.c
@@ -6,53 +6,20 @@
  */
 
 #include <linux/bitmap.h>
+#include <linux/device.h>
 #include <linux/io.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 #include <linux/iopoll.h>
-#include <linux/mod_devicetable.h>
-#include <linux/platform_device.h>
 #include <linux/reset-controller.h>
 #include <linux/spinlock.h>
 
-#include <dt-bindings/reset/starfive-jh7100.h>
-
-/* register offsets */
-#define JH7100_RESET_ASSERT0	0x00
-#define JH7100_RESET_ASSERT1	0x04
-#define JH7100_RESET_ASSERT2	0x08
-#define JH7100_RESET_ASSERT3	0x0c
-#define JH7100_RESET_STATUS0	0x10
-#define JH7100_RESET_STATUS1	0x14
-#define JH7100_RESET_STATUS2	0x18
-#define JH7100_RESET_STATUS3	0x1c
-
-/*
- * Writing a 1 to the n'th bit of the m'th ASSERT register asserts
- * line 32m + n, and writing a 0 deasserts the same line.
- * Most reset lines have their status inverted so a 0 bit in the STATUS
- * register means the line is asserted and a 1 means it's deasserted. A few
- * lines don't though, so store the expected value of the status registers when
- * all lines are asserted.
- */
-static const u64 jh7100_reset_asserted[2] = {
-	/* STATUS0 */
-	BIT_ULL_MASK(JH7100_RST_U74) |
-	BIT_ULL_MASK(JH7100_RST_VP6_DRESET) |
-	BIT_ULL_MASK(JH7100_RST_VP6_BRESET) |
-	/* STATUS1 */
-	BIT_ULL_MASK(JH7100_RST_HIFI4_DRESET) |
-	BIT_ULL_MASK(JH7100_RST_HIFI4_BRESET),
-	/* STATUS2 */
-	BIT_ULL_MASK(JH7100_RST_E24) |
-	/* STATUS3 */
-	0,
-};
-
 struct jh7100_reset {
 	struct reset_controller_dev rcdev;
 	/* protect registers against concurrent read-modify-write */
 	spinlock_t lock;
-	void __iomem *base;
+	void __iomem *assert;
+	void __iomem *status;
+	const u64 *asserted;
 };
 
 static inline struct jh7100_reset *
@@ -67,9 +34,9 @@ static int jh7100_reset_update(struct reset_controller_dev *rcdev,
 	struct jh7100_reset *data = jh7100_reset_from(rcdev);
 	unsigned long offset = BIT_ULL_WORD(id);
 	u64 mask = BIT_ULL_MASK(id);
-	void __iomem *reg_assert = data->base + JH7100_RESET_ASSERT0 + offset * sizeof(u64);
-	void __iomem *reg_status = data->base + JH7100_RESET_STATUS0 + offset * sizeof(u64);
-	u64 done = jh7100_reset_asserted[offset] & mask;
+	void __iomem *reg_assert = data->assert + offset * sizeof(u64);
+	void __iomem *reg_status = data->status + offset * sizeof(u64);
+	u64 done = data->asserted ? data->asserted[offset] & mask : 0;
 	u64 value;
 	unsigned long flags;
 	int ret;
@@ -123,10 +90,10 @@ static int jh7100_reset_status(struct reset_controller_dev *rcdev,
 	struct jh7100_reset *data = jh7100_reset_from(rcdev);
 	unsigned long offset = BIT_ULL_WORD(id);
 	u64 mask = BIT_ULL_MASK(id);
-	void __iomem *reg_status = data->base + JH7100_RESET_STATUS0 + offset * sizeof(u64);
+	void __iomem *reg_status = data->status + offset * sizeof(u64);
 	u64 value = readq(reg_status);
 
-	return !((value ^ jh7100_reset_asserted[offset]) & mask);
+	return !((value ^ data->asserted[offset]) & mask);
 }
 
 static const struct reset_control_ops jh7100_reset_ops = {
@@ -136,38 +103,29 @@ static const struct reset_control_ops jh7100_reset_ops = {
 	.status		= jh7100_reset_status,
 };
 
-static int __init jh7100_reset_probe(struct platform_device *pdev)
+int reset_starfive_jh7100_register(struct device *dev, struct device_node *of_node,
+				   void __iomem *assert, void __iomem *status,
+				   const u64 *asserted, unsigned int nr_resets,
+				   bool is_module)
 {
 	struct jh7100_reset *data;
 
-	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
 
-	data->base = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(data->base))
-		return PTR_ERR(data->base);
-
 	data->rcdev.ops = &jh7100_reset_ops;
-	data->rcdev.owner = THIS_MODULE;
-	data->rcdev.nr_resets = JH7100_RSTN_END;
-	data->rcdev.dev = &pdev->dev;
-	data->rcdev.of_node = pdev->dev.of_node;
+	if (is_module)
+		data->rcdev.owner = THIS_MODULE;
+	data->rcdev.nr_resets = nr_resets;
+	data->rcdev.dev = dev;
+	data->rcdev.of_node = of_node;
+
 	spin_lock_init(&data->lock);
+	data->assert = assert;
+	data->status = status;
+	data->asserted = asserted;
 
-	return devm_reset_controller_register(&pdev->dev, &data->rcdev);
+	return devm_reset_controller_register(dev, &data->rcdev);
 }
-
-static const struct of_device_id jh7100_reset_dt_ids[] = {
-	{ .compatible = "starfive,jh7100-reset" },
-	{ /* sentinel */ }
-};
-
-static struct platform_driver jh7100_reset_driver = {
-	.driver = {
-		.name = "jh7100-reset",
-		.of_match_table = jh7100_reset_dt_ids,
-		.suppress_bind_attrs = true,
-	},
-};
-builtin_platform_driver_probe(jh7100_reset_driver, jh7100_reset_probe);
+EXPORT_SYMBOL_GPL(reset_starfive_jh7100_register);
diff --git a/drivers/reset/starfive/reset-starfive-jh71x0.h b/drivers/reset/starfive/reset-starfive-jh71x0.h
new file mode 100644
index 000000000000..10770c55ab0e
--- /dev/null
+++ b/drivers/reset/starfive/reset-starfive-jh71x0.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk>
+ */
+
+#ifndef __RESET_STARFIVE_JH71X0_H
+#define __RESET_STARFIVE_JH71X0_H
+
+int reset_starfive_jh7100_register(struct device *dev, struct device_node *of_node,
+				   void __iomem *assert, void __iomem *status,
+				   const u64 *asserted, unsigned int nr_resets,
+				   bool is_module);
+
+#endif /* __RESET_STARFIVE_JH71X0_H */
-- 
2.38.1