1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/bus/imx-aipstz.c b/drivers/bus/imx-aipstz.c
new file mode 100644
index 000000000000..5fdf377f5d06
--- /dev/null
+++ b/drivers/bus/imx-aipstz.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2025 NXP
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+
+#define IMX_AIPSTZ_MPR0 0x0
+
+struct imx_aipstz_config {
+	u32 mpr0;
+};
+
+struct imx_aipstz_data {
+	void __iomem *base;
+	const struct imx_aipstz_config *default_cfg;
+};
+
+static void imx_aipstz_apply_default(struct imx_aipstz_data *data)
+{
+	writel(data->default_cfg->mpr0, data->base + IMX_AIPSTZ_MPR0);
+}
+
+static const struct of_device_id imx_aipstz_match_table[] = {
+	{ .compatible = "simple-bus", },
+	{ }
+};
+
+static int imx_aipstz_probe(struct platform_device *pdev)
+{
+	struct imx_aipstz_data *data;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return dev_err_probe(&pdev->dev, -ENOMEM,
+				     "failed to allocate data memory\n");
+
+	data->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
+	if (IS_ERR(data->base))
+		return dev_err_probe(&pdev->dev, -ENOMEM,
+				     "failed to get/ioremap AC memory\n");
+
+	data->default_cfg = of_device_get_match_data(&pdev->dev);
+
+	imx_aipstz_apply_default(data);
+
+	dev_set_drvdata(&pdev->dev, data);
+
+	pm_runtime_set_active(&pdev->dev);
+	devm_pm_runtime_enable(&pdev->dev);
+
+	return of_platform_populate(pdev->dev.of_node, imx_aipstz_match_table,
+				    NULL, &pdev->dev);
+}
+
+static void imx_aipstz_remove(struct platform_device *pdev)
+{
+	of_platform_depopulate(&pdev->dev);
+}
+
+static int imx_aipstz_runtime_resume(struct device *dev)
+{
+	struct imx_aipstz_data *data = dev_get_drvdata(dev);
+
+	/* restore potentially lost configuration during domain power-off */
+	imx_aipstz_apply_default(data);
+
+	return 0;
+}
+
+static const struct dev_pm_ops imx_aipstz_pm_ops = {
+	RUNTIME_PM_OPS(NULL, imx_aipstz_runtime_resume, NULL)
+	SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume)
+};
+
+/*
+ * following configuration is equivalent to:
+ *	masters 0-7 => trusted for R/W + use AHB's HPROT[1] to det. privilege
+ */
+static const struct imx_aipstz_config imx8mp_aipstz_default_cfg = {
+	.mpr0 = 0x77777777,
+};
+
+static const struct of_device_id imx_aipstz_of_ids[] = {
+	{ .compatible = "fsl,imx8mp-aipstz", .data = &imx8mp_aipstz_default_cfg },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, imx_aipstz_of_ids);
+
+static struct platform_driver imx_aipstz_of_driver = {
+	.probe = imx_aipstz_probe,
+	.remove = imx_aipstz_remove,
+	.driver = {
+		.name = "imx-aipstz",
+		.of_match_table = imx_aipstz_of_ids,
+		.pm = pm_ptr(&imx_aipstz_pm_ops),
+	},
+};
+module_platform_driver(imx_aipstz_of_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("IMX secure AHB to IP Slave bus (AIPSTZ) bridge driver");
+MODULE_AUTHOR("Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>");