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build/patch/kernel/archive/starfive-6.1/1012-reset-starfive-Add-JH7100-audio-reset-driver.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Emil Renner Berthing <kernel@esmil.dk>
Date: Sat, 20 Nov 2021 19:30:49 +0100
Subject: reset: starfive: Add JH7100 audio reset driver
The audio resets are almost identical to the system resets, there are
just fewer of them. So factor out and export a generic probe function,
so most of the reset controller implementation can be shared.
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
---
MAINTAINERS | 8 +-
drivers/reset/starfive/Kconfig | 7 ++
drivers/reset/starfive/Makefile | 1 +
drivers/reset/starfive/reset-starfive-jh7100-audio.c | 58 ++++++++++
drivers/reset/starfive/reset-starfive-jh7100.c | 37 ++++--
drivers/reset/starfive/reset-starfive-jh7100.h | 16 +++
6 files changed, 112 insertions(+), 15 deletions(-)
diff --git a/MAINTAINERS b/MAINTAINERS
index a7f510edd537..09459491eef9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19650,12 +19650,12 @@ F: Documentation/devicetree/bindings/pinctrl/starfive,jh7100-pinctrl.yaml
F: drivers/pinctrl/starfive/
F: include/dt-bindings/pinctrl/pinctrl-starfive-jh7100.h
-STARFIVE JH7100 RESET CONTROLLER DRIVER
+STARFIVE JH7100 RESET CONTROLLER DRIVERS
M: Emil Renner Berthing <kernel@esmil.dk>
S: Maintained
-F: Documentation/devicetree/bindings/reset/starfive,jh7100-reset.yaml
-F: drivers/reset/starfive/reset-starfive-jh7100.c
-F: include/dt-bindings/reset/starfive-jh7100.h
+F: Documentation/devicetree/bindings/reset/starfive,jh7100-*.yaml
+F: drivers/reset/starfive/reset-starfive-jh7100*
+F: include/dt-bindings/reset/starfive-jh7100*.h
STATIC BRANCH/CALL
M: Peter Zijlstra <peterz@infradead.org>
diff --git a/drivers/reset/starfive/Kconfig b/drivers/reset/starfive/Kconfig
index cddebdba7177..5f88d3792d96 100644
--- a/drivers/reset/starfive/Kconfig
+++ b/drivers/reset/starfive/Kconfig
@@ -6,3 +6,10 @@ config RESET_STARFIVE_JH7100
default SOC_STARFIVE
help
This enables the reset controller driver for the StarFive JH7100 SoC.
+
+config RESET_STARFIVE_JH7100_AUDIO
+ tristate "StarFive JH7100 Audio Reset Driver"
+ depends on RESET_STARFIVE_JH7100
+ default m if SOC_STARFIVE
+ help
+ This enables the audio reset driver for the StarFive JH7100 SoC.
diff --git a/drivers/reset/starfive/Makefile b/drivers/reset/starfive/Makefile
index 670d049423f5..d3a55a75dd0f 100644
--- a/drivers/reset/starfive/Makefile
+++ b/drivers/reset/starfive/Makefile
@@ -1,2 +1,3 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_RESET_STARFIVE_JH7100) += reset-starfive-jh7100.o
+obj-$(CONFIG_RESET_STARFIVE_JH7100_AUDIO) += reset-starfive-jh7100-audio.o
diff --git a/drivers/reset/starfive/reset-starfive-jh7100-audio.c b/drivers/reset/starfive/reset-starfive-jh7100-audio.c
new file mode 100644
index 000000000000..bae8f8c90d28
--- /dev/null
+++ b/drivers/reset/starfive/reset-starfive-jh7100-audio.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Audio reset driver for the StarFive JH7100 SoC
+ *
+ * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk>
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+
+#include <dt-bindings/reset/starfive-jh7100-audio.h>
+
+#include "reset-starfive-jh7100.h"
+
+/* register offsets */
+#define JH7100_AUDRST_ASSERT0 0x00
+#define JH7100_AUDRST_STATUS0 0x04
+
+/*
+ * Writing a 1 to the n'th bit of the ASSERT register asserts
+ * line 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 u32 jh7100_audrst_asserted[1] = {
+ BIT(JH7100_AUDRST_USB_AXI) |
+ BIT(JH7100_AUDRST_USB_PWRUP_RST_N) |
+ BIT(JH7100_AUDRST_USB_PONRST)
+};
+
+static int jh7100_audrst_probe(struct platform_device *pdev)
+{
+ return reset_starfive_jh7100_generic_probe(pdev, jh7100_audrst_asserted,
+ JH7100_AUDRST_STATUS0, JH7100_AUDRSTN_END);
+}
+
+static const struct of_device_id jh7100_audrst_dt_ids[] = {
+ { .compatible = "starfive,jh7100-audrst" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, jh7100_audrst_dt_ids);
+
+static struct platform_driver jh7100_audrst_driver = {
+ .probe = jh7100_audrst_probe,
+ .driver = {
+ .name = "jh7100-reset-audio",
+ .of_match_table = jh7100_audrst_dt_ids,
+ },
+};
+module_platform_driver(jh7100_audrst_driver);
+
+MODULE_AUTHOR("Emil Renner Berthing");
+MODULE_DESCRIPTION("StarFive JH7100 audio reset driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/reset/starfive/reset-starfive-jh7100.c b/drivers/reset/starfive/reset-starfive-jh7100.c
index 7563d317f5c8..8e8733908c70 100644
--- a/drivers/reset/starfive/reset-starfive-jh7100.c
+++ b/drivers/reset/starfive/reset-starfive-jh7100.c
@@ -16,6 +16,8 @@
#include <dt-bindings/reset/starfive-jh7100.h>
+#include "reset-starfive-jh7100.h"
+
/* register offsets */
#define JH7100_RESET_ASSERT0 0x00
#define JH7100_RESET_ASSERT1 0x04
@@ -52,7 +54,9 @@ 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 u32 *asserted;
};
static inline struct jh7100_reset *
@@ -67,9 +71,9 @@ static int jh7100_reset_update(struct reset_controller_dev *rcdev,
struct jh7100_reset *data = jh7100_reset_from(rcdev);
unsigned long offset = id / 32;
u32 mask = BIT(id % 32);
- void __iomem *reg_assert = data->base + JH7100_RESET_ASSERT0 + offset * sizeof(u32);
- void __iomem *reg_status = data->base + JH7100_RESET_STATUS0 + offset * sizeof(u32);
- u32 done = jh7100_reset_asserted[offset] & mask;
+ void __iomem *reg_assert = data->assert + offset * sizeof(u32);
+ void __iomem *reg_status = data->status + offset * sizeof(u32);
+ u32 done = data->asserted[offset] & mask;
u32 value;
unsigned long flags;
int ret;
@@ -123,10 +127,10 @@ static int jh7100_reset_status(struct reset_controller_dev *rcdev,
struct jh7100_reset *data = jh7100_reset_from(rcdev);
unsigned long offset = id / 32;
u32 mask = BIT(id % 32);
- void __iomem *reg_status = data->base + JH7100_RESET_STATUS0 + offset * sizeof(u32);
+ void __iomem *reg_status = data->status + offset * sizeof(u32);
u32 value = readl(reg_status);
- return !((value ^ jh7100_reset_asserted[offset]) & mask);
+ return !((value ^ data->asserted[offset]) & mask);
}
static const struct reset_control_ops jh7100_reset_ops = {
@@ -136,7 +140,8 @@ 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_generic_probe(struct platform_device *pdev, const u32 *asserted,
+ unsigned int status_offset, unsigned int nr_resets)
{
struct jh7100_reset *data;
@@ -144,19 +149,29 @@ static int __init jh7100_reset_probe(struct platform_device *pdev)
if (!data)
return -ENOMEM;
- data->base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(data->base))
- return PTR_ERR(data->base);
+ data->assert = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(data->assert))
+ return PTR_ERR(data->assert);
data->rcdev.ops = &jh7100_reset_ops;
data->rcdev.owner = THIS_MODULE;
- data->rcdev.nr_resets = JH7100_RSTN_END;
+ data->rcdev.nr_resets = nr_resets;
data->rcdev.dev = &pdev->dev;
data->rcdev.of_node = pdev->dev.of_node;
+
spin_lock_init(&data->lock);
+ data->status = data->assert + status_offset;
+ data->asserted = asserted;
return devm_reset_controller_register(&pdev->dev, &data->rcdev);
}
+EXPORT_SYMBOL_GPL(reset_starfive_jh7100_generic_probe);
+
+static int __init jh7100_reset_probe(struct platform_device *pdev)
+{
+ return reset_starfive_jh7100_generic_probe(pdev, jh7100_reset_asserted,
+ JH7100_RESET_STATUS0, JH7100_RSTN_END);
+}
static const struct of_device_id jh7100_reset_dt_ids[] = {
{ .compatible = "starfive,jh7100-reset" },
diff --git a/drivers/reset/starfive/reset-starfive-jh7100.h b/drivers/reset/starfive/reset-starfive-jh7100.h
new file mode 100644
index 000000000000..ee8f3e3b1644
--- /dev/null
+++ b/drivers/reset/starfive/reset-starfive-jh7100.h
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk>
+ */
+
+#ifndef _RESET_STARFIVE_JH7100_H_
+#define _RESET_STARFIVE_JH7100_H_
+
+#include <linux/platform_device.h>
+
+int reset_starfive_jh7100_generic_probe(struct platform_device *pdev,
+ const u32 *asserted,
+ unsigned int status_offset,
+ unsigned int nr_resets);
+
+#endif
--
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