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authorArnd Bergmann <arnd@arndb.de>2019-02-15 17:16:17 +0100
committerArnd Bergmann <arnd@arndb.de>2019-02-15 17:16:45 +0100
commit59f527dd7a6191734f7c2049f045cbcac290efa8 (patch)
tree869102cc0060ad8d24185bf9b691da23b1284b6d /drivers/reset
parent57f87c7989d2ceda9fbbfb838bd50f9879038fd7 (diff)
parente23d9c6d0d4912fab12cd2d56070b0a8199772f0 (diff)
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Merge tag 'zynqmp-soc-for-v5.1' of https://github.com/Xilinx/linux-xlnx into arm/drivers
arm64: zynqmp: SoC changes for v5.1 - Extend firmware interface with reset, nvmem, power management and power domain support - Add reset, nvmem driver, power management and power domain drivers - * tag 'zynqmp-soc-for-v5.1' of https://github.com/Xilinx/linux-xlnx: drivers: soc: xilinx: Add ZynqMP power domain driver firmware: xilinx: Add APIs to control node status/power dt-bindings: power: Add ZynqMP power domain bindings drivers: soc: xilinx: Add ZynqMP PM driver firmware: xilinx: Implement ZynqMP power management APIs dt-bindings: soc: Add ZynqMP PM bindings nvmem: zynqmp: Added zynqmp nvmem firmware driver dt-bindings: nvmem: Add bindings for ZynqMP nvmem driver firmware: xilinx: Add zynqmp_pm_get_chipid() API reset: reset-zynqmp: Adding support for Xilinx zynqmp reset controller. dt-bindings: reset: Add bindings for ZynqMP reset driver firmware: xilinx: Add reset API's Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/reset')
-rw-r--r--drivers/reset/Makefile1
-rw-r--r--drivers/reset/reset-zynqmp.c114
2 files changed, 115 insertions, 0 deletions
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index dc7874df78d9..573b8386d901 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -26,4 +26,5 @@ obj-$(CONFIG_RESET_TI_SYSCON) += reset-ti-syscon.o
obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o
obj-$(CONFIG_RESET_UNIPHIER_GLUE) += reset-uniphier-glue.o
obj-$(CONFIG_RESET_ZYNQ) += reset-zynq.o
+obj-$(CONFIG_ARCH_ZYNQMP) += reset-zynqmp.o
diff --git a/drivers/reset/reset-zynqmp.c b/drivers/reset/reset-zynqmp.c
new file mode 100644
index 000000000000..2ef1f13aa47b
--- /dev/null
+++ b/drivers/reset/reset-zynqmp.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Xilinx, Inc.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+#include <linux/firmware/xlnx-zynqmp.h>
+
+#define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START)
+#define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START
+
+struct zynqmp_reset_data {
+ struct reset_controller_dev rcdev;
+ const struct zynqmp_eemi_ops *eemi_ops;
+};
+
+static inline struct zynqmp_reset_data *
+to_zynqmp_reset_data(struct reset_controller_dev *rcdev)
+{
+ return container_of(rcdev, struct zynqmp_reset_data, rcdev);
+}
+
+static int zynqmp_reset_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
+
+ return priv->eemi_ops->reset_assert(ZYNQMP_RESET_ID + id,
+ PM_RESET_ACTION_ASSERT);
+}
+
+static int zynqmp_reset_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
+
+ return priv->eemi_ops->reset_assert(ZYNQMP_RESET_ID + id,
+ PM_RESET_ACTION_RELEASE);
+}
+
+static int zynqmp_reset_status(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
+ int val, err;
+
+ err = priv->eemi_ops->reset_get_status(ZYNQMP_RESET_ID + id, &val);
+ if (err)
+ return err;
+
+ return val;
+}
+
+static int zynqmp_reset_reset(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
+
+ return priv->eemi_ops->reset_assert(ZYNQMP_RESET_ID + id,
+ PM_RESET_ACTION_PULSE);
+}
+
+static struct reset_control_ops zynqmp_reset_ops = {
+ .reset = zynqmp_reset_reset,
+ .assert = zynqmp_reset_assert,
+ .deassert = zynqmp_reset_deassert,
+ .status = zynqmp_reset_status,
+};
+
+static int zynqmp_reset_probe(struct platform_device *pdev)
+{
+ struct zynqmp_reset_data *priv;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, priv);
+
+ priv->eemi_ops = zynqmp_pm_get_eemi_ops();
+ if (!priv->eemi_ops)
+ return -ENXIO;
+
+ priv->rcdev.ops = &zynqmp_reset_ops;
+ priv->rcdev.owner = THIS_MODULE;
+ priv->rcdev.of_node = pdev->dev.of_node;
+ priv->rcdev.nr_resets = ZYNQMP_NR_RESETS;
+
+ return devm_reset_controller_register(&pdev->dev, &priv->rcdev);
+}
+
+static const struct of_device_id zynqmp_reset_dt_ids[] = {
+ { .compatible = "xlnx,zynqmp-reset", },
+ { /* sentinel */ },
+};
+
+static struct platform_driver zynqmp_reset_driver = {
+ .probe = zynqmp_reset_probe,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = zynqmp_reset_dt_ids,
+ },
+};
+
+static int __init zynqmp_reset_init(void)
+{
+ return platform_driver_register(&zynqmp_reset_driver);
+}
+
+arch_initcall(zynqmp_reset_init);