This patch adds reset controller driver for ZTE's zx2967 family.
Signed-off-by: Baoyou Xie <baoyou.xie@xxxxxxxxxx>
---
drivers/reset/Kconfig | 6 ++
drivers/reset/Makefile | 1 +
drivers/reset/reset-zx2967.c | 136 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 143 insertions(+)
create mode 100644 drivers/reset/reset-zx2967.c
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 172dc96..972d077 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -92,6 +92,12 @@ config RESET_ZYNQ
help
This enables the reset controller driver for Xilinx Zynq SoCs.
+config RESET_ZX2967
+ bool "ZX2967 Reset Driver"
+ depends on ARCH_ZX || COMPILE_TEST
+ help
+ This enables the reset controller driver for ZTE zx2967 family.
+
source "drivers/reset/sti/Kconfig"
source "drivers/reset/hisilicon/Kconfig"
source "drivers/reset/tegra/Kconfig"
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 13b346e..807b77b 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -14,3 +14,4 @@ obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o
obj-$(CONFIG_TI_SYSCON_RESET) += reset-ti-syscon.o
obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o
obj-$(CONFIG_RESET_ZYNQ) += reset-zynq.o
+obj-$(CONFIG_RESET_ZX2967) += reset-zx2967.o
diff --git a/drivers/reset/reset-zx2967.c b/drivers/reset/reset-zx2967.c
new file mode 100644
index 0000000..63f9c41
--- /dev/null
+++ b/drivers/reset/reset-zx2967.c
@@ -0,0 +1,136 @@
+/*
+ * ZTE's zx2967 family thermal sensor driver
+ *
+ * Copyright (C) 2017 ZTE Ltd.
+ *
+ * Author: Baoyou Xie <baoyou.xie@xxxxxxxxxx>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+
+struct zx2967_reset {
+ void __iomem *reg_base;
+ spinlock_t lock;
+ struct reset_controller_dev rcdev;
+};
+
+static int zx2967_reset_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct zx2967_reset *reset = NULL;
+ int bank = id / 32;
+ int offset = id % 32;
+ unsigned int reg;
+ unsigned long flags;
+
+ reset = container_of(rcdev, struct zx2967_reset, rcdev);
+
+ spin_lock_irqsave(&reset->lock, flags);
+
+ reg = readl(reset->reg_base + (bank * 4));
+ writel(reg & ~BIT(offset), reset->reg_base + (bank * 4));
+ reg = readl(reset->reg_base + (bank * 4));
+
+ spin_unlock_irqrestore(&reset->lock, flags);
+
+ return 0;
+}
+
+static int zx2967_reset_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct zx2967_reset *reset = NULL;
+ int bank = id / 32;
+ int offset = id % 32;
+ unsigned int reg;
+ unsigned long flags;
+
+ reset = container_of(rcdev, struct zx2967_reset, rcdev);
+
+ spin_lock_irqsave(&reset->lock, flags);
+
+ reg = readl(reset->reg_base + (bank * 4));
+ writel(reg | BIT(offset), reset->reg_base + (bank * 4));
+ reg = readl(reset->reg_base + (bank * 4));
+
+ spin_unlock_irqrestore(&reset->lock, flags);
+
+ return 0;
+}
+
+static struct reset_control_ops zx2967_reset_ops = {
+ .assert = zx2967_reset_assert,
+ .deassert = zx2967_reset_deassert,
+};
+
+static int zx2967_reset_probe(struct platform_device *pdev)
+{
+ struct zx2967_reset *reset;
+ struct resource *res;
+
+ reset = devm_kzalloc(&pdev->dev, sizeof(*reset), GFP_KERNEL);
+ if (!reset)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ reset->reg_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(reset->reg_base))
+ return PTR_ERR(reset->reg_base);
+
+ spin_lock_init(&reset->lock);
+
+ reset->rcdev.owner = THIS_MODULE;
+ reset->rcdev.nr_resets = resource_size(res) * 8;
+ reset->rcdev.ops = &zx2967_reset_ops;
+ reset->rcdev.of_node = pdev->dev.of_node;
+
+ dev_info(&pdev->dev, "reset controller cnt:%d",
+ reset->rcdev.nr_resets);
+
+ return reset_controller_register(&reset->rcdev);
+}
+
+static int zx2967_reset_remove(struct platform_device *pdev)
+{
+ struct zx2967_reset *reset = platform_get_drvdata(pdev);
+
+ reset_controller_unregister(&reset->rcdev);
+
+ return 0;
+}
+
+static const struct of_device_id zx2967_reset_dt_ids[] = {
+ { .compatible = "zte,zx296718-reset", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, zx2967_reset_dt_ids);
+
+static struct platform_driver zx2967_reset_driver = {
+ .probe = zx2967_reset_probe,
+ .remove = zx2967_reset_remove,
+ .driver = {
+ .name = "zx2967-reset",
+ .of_match_table = zx2967_reset_dt_ids,
+ },
+};
+
+static int __init zx2967_reset_init(void)
+{
+ return platform_driver_register(&zx2967_reset_driver);
+}
+arch_initcall(zx2967_reset_init);
+
+static void __exit zx2967_reset_exit(void)
+{
+ platform_driver_unregister(&zx2967_reset_driver);
+}
+module_exit(zx2967_reset_exit);
+
+MODULE_AUTHOR("Baoyou Xie <baoyou.xie@xxxxxxxxxx>");
+MODULE_DESCRIPTION("ZTE zx2967 Reset Controller Driver");
+MODULE_LICENSE("GPL");
--
2.7.4
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