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-rw-r--r--drivers/reset/Kconfig6
-rw-r--r--drivers/reset/Makefile1
-rw-r--r--drivers/reset/reset-stm32mp1.c115
3 files changed, 122 insertions, 0 deletions
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 1efbc6cc8021..c0b292be1b72 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -97,6 +97,12 @@ config RESET_SIMPLE
- Allwinner SoCs
- ZTE's zx2967 family
+config RESET_STM32MP157
+ bool "STM32MP157 Reset Driver" if COMPILE_TEST
+ default MACH_STM32MP157
+ help
+ This enables the RCC reset controller driver for STM32 MPUs.
+
config RESET_SUNXI
bool "Allwinner SoCs Reset Driver" if COMPILE_TEST && !ARCH_SUNXI
default ARCH_SUNXI
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 132c24f5ddb5..c1261dcfe9ad 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_RESET_MESON) += reset-meson.o
obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
obj-$(CONFIG_RESET_PISTACHIO) += reset-pistachio.o
obj-$(CONFIG_RESET_SIMPLE) += reset-simple.o
+obj-$(CONFIG_RESET_STM32MP157) += reset-stm32mp1.o
obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o
obj-$(CONFIG_RESET_TI_SCI) += reset-ti-sci.o
obj-$(CONFIG_RESET_TI_SYSCON) += reset-ti-syscon.o
diff --git a/drivers/reset/reset-stm32mp1.c b/drivers/reset/reset-stm32mp1.c
new file mode 100644
index 000000000000..b221a28041fa
--- /dev/null
+++ b/drivers/reset/reset-stm32mp1.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) STMicroelectronics 2018 - All Rights Reserved
+ * Author: Gabriel Fernandez <gabriel.fernandez@st.com> for STMicroelectronics.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+
+#define CLR_OFFSET 0x4
+
+struct stm32_reset_data {
+ struct reset_controller_dev rcdev;
+ void __iomem *membase;
+};
+
+static inline struct stm32_reset_data *
+to_stm32_reset_data(struct reset_controller_dev *rcdev)
+{
+ return container_of(rcdev, struct stm32_reset_data, rcdev);
+}
+
+static int stm32_reset_update(struct reset_controller_dev *rcdev,
+ unsigned long id, bool assert)
+{
+ struct stm32_reset_data *data = to_stm32_reset_data(rcdev);
+ int reg_width = sizeof(u32);
+ int bank = id / (reg_width * BITS_PER_BYTE);
+ int offset = id % (reg_width * BITS_PER_BYTE);
+ void __iomem *addr;
+
+ addr = data->membase + (bank * reg_width);
+ if (!assert)
+ addr += CLR_OFFSET;
+
+ writel(BIT(offset), addr);
+
+ return 0;
+}
+
+static int stm32_reset_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ return stm32_reset_update(rcdev, id, true);
+}
+
+static int stm32_reset_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ return stm32_reset_update(rcdev, id, false);
+}
+
+static int stm32_reset_status(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct stm32_reset_data *data = to_stm32_reset_data(rcdev);
+ int reg_width = sizeof(u32);
+ int bank = id / (reg_width * BITS_PER_BYTE);
+ int offset = id % (reg_width * BITS_PER_BYTE);
+ u32 reg;
+
+ reg = readl(data->membase + (bank * reg_width));
+
+ return !!(reg & BIT(offset));
+}
+
+static const struct reset_control_ops stm32_reset_ops = {
+ .assert = stm32_reset_assert,
+ .deassert = stm32_reset_deassert,
+ .status = stm32_reset_status,
+};
+
+static const struct of_device_id stm32_reset_dt_ids[] = {
+ { .compatible = "st,stm32mp1-rcc"},
+ { /* sentinel */ },
+};
+
+static int stm32_reset_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct stm32_reset_data *data;
+ void __iomem *membase;
+ struct resource *res;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ membase = devm_ioremap_resource(dev, res);
+ if (IS_ERR(membase))
+ return PTR_ERR(membase);
+
+ data->membase = membase;
+ data->rcdev.owner = THIS_MODULE;
+ data->rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE;
+ data->rcdev.ops = &stm32_reset_ops;
+ data->rcdev.of_node = dev->of_node;
+
+ return devm_reset_controller_register(dev, &data->rcdev);
+}
+
+static struct platform_driver stm32_reset_driver = {
+ .probe = stm32_reset_probe,
+ .driver = {
+ .name = "stm32mp1-reset",
+ .of_match_table = stm32_reset_dt_ids,
+ },
+};
+
+builtin_platform_driver(stm32_reset_driver);
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