+++ /dev/null
-From aac025437f14c1647dc6054b95daeebed34f6971 Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
-Date: Wed, 17 Jun 2020 12:50:35 +0200
-Subject: [PATCH 3/9] reset: add BCM6345 reset controller driver
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-Add support for resetting blocks through the Linux reset controller
-subsystem for BCM63xx SoCs.
-
-Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
-Reviewed-by: Florian Fainelli <F.fainelli@gmail.com>
-Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
-Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
----
- drivers/reset/Kconfig | 7 ++
- drivers/reset/Makefile | 1 +
- drivers/reset/reset-bcm6345.c | 135 ++++++++++++++++++++++++++++++++++
- 3 files changed, 143 insertions(+)
- create mode 100644 drivers/reset/reset-bcm6345.c
-
---- a/drivers/reset/Kconfig
-+++ b/drivers/reset/Kconfig
-@@ -35,6 +35,13 @@ config RESET_AXS10X
- help
- This enables the reset controller driver for AXS10x.
-
-+config RESET_BCM6345
-+ bool "BCM6345 Reset Controller"
-+ depends on BMIPS_GENERIC || COMPILE_TEST
-+ default BMIPS_GENERIC
-+ help
-+ This enables the reset controller driver for BCM6345 SoCs.
-+
- config RESET_BERLIN
- bool "Berlin Reset Driver" if COMPILE_TEST
- default ARCH_BERLIN
---- a/drivers/reset/Makefile
-+++ b/drivers/reset/Makefile
-@@ -6,6 +6,7 @@ obj-$(CONFIG_ARCH_TEGRA) += tegra/
- obj-$(CONFIG_RESET_A10SR) += reset-a10sr.o
- obj-$(CONFIG_RESET_ATH79) += reset-ath79.o
- obj-$(CONFIG_RESET_AXS10X) += reset-axs10x.o
-+obj-$(CONFIG_RESET_BCM6345) += reset-bcm6345.o
- obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o
- obj-$(CONFIG_RESET_BRCMSTB) += reset-brcmstb.o
- obj-$(CONFIG_RESET_BRCMSTB_RESCAL) += reset-brcmstb-rescal.o
---- /dev/null
-+++ b/drivers/reset/reset-bcm6345.c
-@@ -0,0 +1,135 @@
-+// SPDX-License-Identifier: GPL-2.0-or-later
-+/*
-+ * BCM6345 Reset Controller Driver
-+ *
-+ * Copyright (C) 2020 Álvaro Fernández Rojas <noltari@gmail.com>
-+ */
-+
-+#include <linux/delay.h>
-+#include <linux/init.h>
-+#include <linux/io.h>
-+#include <linux/mod_devicetable.h>
-+#include <linux/platform_device.h>
-+#include <linux/reset-controller.h>
-+
-+#define BCM6345_RESET_NUM 32
-+#define BCM6345_RESET_SLEEP_MIN_US 10000
-+#define BCM6345_RESET_SLEEP_MAX_US 20000
-+
-+struct bcm6345_reset {
-+ struct reset_controller_dev rcdev;
-+ void __iomem *base;
-+ spinlock_t lock;
-+};
-+
-+static inline struct bcm6345_reset *
-+to_bcm6345_reset(struct reset_controller_dev *rcdev)
-+{
-+ return container_of(rcdev, struct bcm6345_reset, rcdev);
-+}
-+
-+static int bcm6345_reset_update(struct reset_controller_dev *rcdev,
-+ unsigned long id, bool assert)
-+{
-+ struct bcm6345_reset *bcm6345_reset = to_bcm6345_reset(rcdev);
-+ unsigned long flags;
-+ uint32_t val;
-+
-+ spin_lock_irqsave(&bcm6345_reset->lock, flags);
-+ val = __raw_readl(bcm6345_reset->base);
-+ if (assert)
-+ val &= ~BIT(id);
-+ else
-+ val |= BIT(id);
-+ __raw_writel(val, bcm6345_reset->base);
-+ spin_unlock_irqrestore(&bcm6345_reset->lock, flags);
-+
-+ return 0;
-+}
-+
-+static int bcm6345_reset_assert(struct reset_controller_dev *rcdev,
-+ unsigned long id)
-+{
-+ return bcm6345_reset_update(rcdev, id, true);
-+}
-+
-+static int bcm6345_reset_deassert(struct reset_controller_dev *rcdev,
-+ unsigned long id)
-+{
-+ return bcm6345_reset_update(rcdev, id, false);
-+}
-+
-+static int bcm6345_reset_reset(struct reset_controller_dev *rcdev,
-+ unsigned long id)
-+{
-+ bcm6345_reset_update(rcdev, id, true);
-+ usleep_range(BCM6345_RESET_SLEEP_MIN_US,
-+ BCM6345_RESET_SLEEP_MAX_US);
-+
-+ bcm6345_reset_update(rcdev, id, false);
-+ /*
-+ * Ensure component is taken out reset state by sleeping also after
-+ * deasserting the reset. Otherwise, the component may not be ready
-+ * for operation.
-+ */
-+ usleep_range(BCM6345_RESET_SLEEP_MIN_US,
-+ BCM6345_RESET_SLEEP_MAX_US);
-+
-+ return 0;
-+}
-+
-+static int bcm6345_reset_status(struct reset_controller_dev *rcdev,
-+ unsigned long id)
-+{
-+ struct bcm6345_reset *bcm6345_reset = to_bcm6345_reset(rcdev);
-+
-+ return !(__raw_readl(bcm6345_reset->base) & BIT(id));
-+}
-+
-+static struct reset_control_ops bcm6345_reset_ops = {
-+ .assert = bcm6345_reset_assert,
-+ .deassert = bcm6345_reset_deassert,
-+ .reset = bcm6345_reset_reset,
-+ .status = bcm6345_reset_status,
-+};
-+
-+static int bcm6345_reset_probe(struct platform_device *pdev)
-+{
-+ struct bcm6345_reset *bcm6345_reset;
-+
-+ bcm6345_reset = devm_kzalloc(&pdev->dev,
-+ sizeof(*bcm6345_reset), GFP_KERNEL);
-+ if (!bcm6345_reset)
-+ return -ENOMEM;
-+
-+ platform_set_drvdata(pdev, bcm6345_reset);
-+
-+ bcm6345_reset->base = devm_platform_ioremap_resource(pdev, 0);
-+ if (IS_ERR(bcm6345_reset->base))
-+ return PTR_ERR(bcm6345_reset->base);
-+
-+ spin_lock_init(&bcm6345_reset->lock);
-+ bcm6345_reset->rcdev.ops = &bcm6345_reset_ops;
-+ bcm6345_reset->rcdev.owner = THIS_MODULE;
-+ bcm6345_reset->rcdev.of_node = pdev->dev.of_node;
-+ bcm6345_reset->rcdev.of_reset_n_cells = 1;
-+ bcm6345_reset->rcdev.nr_resets = BCM6345_RESET_NUM;
-+
-+ return devm_reset_controller_register(&pdev->dev,
-+ &bcm6345_reset->rcdev);
-+}
-+
-+static const struct of_device_id bcm6345_reset_of_match[] = {
-+ { .compatible = "brcm,bcm6345-reset" },
-+ { /* sentinel */ },
-+};
-+
-+static struct platform_driver bcm6345_reset_driver = {
-+ .probe = bcm6345_reset_probe,
-+ .driver = {
-+ .name = "bcm6345-reset",
-+ .of_match_table = bcm6345_reset_of_match,
-+ .suppress_bind_attrs = true,
-+ },
-+};
-+builtin_platform_driver(bcm6345_reset_driver);
projects / openwrt / staging / ldir.git / blobdiff