imx-aipstz.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright 2025 NXP
  4 */
  5
  6#include <linux/module.h>
  7#include <linux/of.h>
  8#include <linux/of_platform.h>
  9#include <linux/platform_device.h>
 10#include <linux/pm_runtime.h>
 11#include <linux/regmap.h>
 12
 13#define IMX_AIPSTZ_MPR0 0x0
 14
 15struct imx_aipstz_config {
 16	u32 mpr0;
 17};
 18
 19struct imx_aipstz_data {
 20	void __iomem *base;
 21	const struct imx_aipstz_config *default_cfg;
 22};
 23
 24static void imx_aipstz_apply_default(struct imx_aipstz_data *data)
 25{
 26	writel(data->default_cfg->mpr0, data->base + IMX_AIPSTZ_MPR0);
 27}
 28
 29static const struct of_device_id imx_aipstz_match_table[] = {
 30	{ .compatible = "simple-bus", },
 31	{ }
 32};
 33
 34static int imx_aipstz_probe(struct platform_device *pdev)
 35{
 36	struct imx_aipstz_data *data;
 37
 38	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 39	if (!data)
 40		return dev_err_probe(&pdev->dev, -ENOMEM,
 41				     "failed to allocate data memory\n");
 42
 43	data->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
 44	if (IS_ERR(data->base))
 45		return dev_err_probe(&pdev->dev, -ENOMEM,
 46				     "failed to get/ioremap AC memory\n");
 47
 48	data->default_cfg = of_device_get_match_data(&pdev->dev);
 49
 50	imx_aipstz_apply_default(data);
 51
 52	dev_set_drvdata(&pdev->dev, data);
 53
 54	pm_runtime_set_active(&pdev->dev);
 55	devm_pm_runtime_enable(&pdev->dev);
 56
 57	return of_platform_populate(pdev->dev.of_node, imx_aipstz_match_table,
 58				    NULL, &pdev->dev);
 59}
 60
 61static void imx_aipstz_remove(struct platform_device *pdev)
 62{
 63	of_platform_depopulate(&pdev->dev);
 64}
 65
 66static int imx_aipstz_runtime_resume(struct device *dev)
 67{
 68	struct imx_aipstz_data *data = dev_get_drvdata(dev);
 69
 70	/* restore potentially lost configuration during domain power-off */
 71	imx_aipstz_apply_default(data);
 72
 73	return 0;
 74}
 75
 76static const struct dev_pm_ops imx_aipstz_pm_ops = {
 77	RUNTIME_PM_OPS(NULL, imx_aipstz_runtime_resume, NULL)
 78	SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume)
 79};
 80
 81/*
 82 * following configuration is equivalent to:
 83 *	masters 0-7 => trusted for R/W + use AHB's HPROT[1] to det. privilege
 84 */
 85static const struct imx_aipstz_config imx8mp_aipstz_default_cfg = {
 86	.mpr0 = 0x77777777,
 87};
 88
 89static const struct of_device_id imx_aipstz_of_ids[] = {
 90	{ .compatible = "fsl,imx8mp-aipstz", .data = &imx8mp_aipstz_default_cfg },
 91	{ }
 92};
 93MODULE_DEVICE_TABLE(of, imx_aipstz_of_ids);
 94
 95static struct platform_driver imx_aipstz_of_driver = {
 96	.probe = imx_aipstz_probe,
 97	.remove = imx_aipstz_remove,
 98	.driver = {
 99		.name = "imx-aipstz",
100		.of_match_table = imx_aipstz_of_ids,
101		.pm = pm_ptr(&imx_aipstz_pm_ops),
102	},
103};
104module_platform_driver(imx_aipstz_of_driver);
105
106MODULE_LICENSE("GPL");
107MODULE_DESCRIPTION("IMX secure AHB to IP Slave bus (AIPSTZ) bridge driver");
108MODULE_AUTHOR("Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>");