|
| 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 | + |
| 15 | +struct imx_aipstz_config { |
| 16 | + u32 mpr0; |
| 17 | +}; |
| 18 | + |
| 19 | +struct imx_aipstz_data { |
| 20 | + void __iomem *base; |
| 21 | + const struct imx_aipstz_config *default_cfg; |
| 22 | +}; |
| 23 | + |
| 24 | +static void imx_aipstz_apply_default(struct imx_aipstz_data *data) |
| 25 | +{ |
| 26 | + writel(data->default_cfg->mpr0, data->base + IMX_AIPSTZ_MPR0); |
| 27 | +} |
| 28 | + |
| 29 | +static const struct of_device_id imx_aipstz_match_table[] = { |
| 30 | + { .compatible = "simple-bus", }, |
| 31 | + { } |
| 32 | +}; |
| 33 | + |
| 34 | +static 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 | + |
| 61 | +static void imx_aipstz_remove(struct platform_device *pdev) |
| 62 | +{ |
| 63 | + of_platform_depopulate(&pdev->dev); |
| 64 | +} |
| 65 | + |
| 66 | +static 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 | + |
| 76 | +static 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 | + */ |
| 85 | +static const struct imx_aipstz_config imx8mp_aipstz_default_cfg = { |
| 86 | + .mpr0 = 0x77777777, |
| 87 | +}; |
| 88 | + |
| 89 | +static const struct of_device_id imx_aipstz_of_ids[] = { |
| 90 | + { .compatible = "fsl,imx8mp-aipstz", .data = &imx8mp_aipstz_default_cfg }, |
| 91 | + { } |
| 92 | +}; |
| 93 | +MODULE_DEVICE_TABLE(of, imx_aipstz_of_ids); |
| 94 | + |
| 95 | +static 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 | +}; |
| 104 | +module_platform_driver(imx_aipstz_of_driver); |
| 105 | + |
| 106 | +MODULE_LICENSE("GPL"); |
| 107 | +MODULE_DESCRIPTION("IMX secure AHB to IP Slave bus (AIPSTZ) bridge driver"); |
| 108 | +MODULE_AUTHOR( "Laurentiu Mihalcea <[email protected]>"); |
0 commit comments