249 lines
5.2 KiB
C
249 lines
5.2 KiB
C
/*
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* UFS SMU (Secure Management Unit) driver for Exynos
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*
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* Copyright (C) 2016 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/smc.h>
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#include <crypto/smu.h>
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static LIST_HEAD(smu_devices);
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struct exynos_smu {
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struct list_head list;
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int id;
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int command;
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int desc_type;
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struct device *dev;
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};
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static int exynos_smu_init(struct platform_device *pdev,
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struct smu_data_setting *smu_set)
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{
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int ret = 0;
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struct exynos_smu *smu = NULL;
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if (!pdev || !smu_set) {
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pr_err("%s: Invalid input parameter.\n", __func__);
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ret = -EINVAL;
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goto err;
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}
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smu = platform_get_drvdata(pdev);
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ret = exynos_smc(SMC_CMD_SMU, smu_set->command, smu_set->id, 0);
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if (ret)
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dev_err(smu->dev, "%s: Fail smc call for SMU init. ret(%d)\n",
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__func__, ret);
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err:
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return ret;
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}
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static int exynos_smu_sec_config(struct platform_device *pdev,
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struct smu_data_setting *smu_set)
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{
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int ret = 0;
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struct exynos_smu *smu = NULL;
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if (!pdev || !smu_set) {
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pr_err("%s: Invalid input parameter.\n", __func__);
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ret = -EINVAL;
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goto err;
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}
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smu = platform_get_drvdata(pdev);
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ret = exynos_smc(SMC_CMD_FMP_SECURITY, 0, smu_set->id, smu_set->desc_type);
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if (ret)
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dev_err(smu->dev, "%s: Fail smc for FMPSECURITY config. ret(%d)\n",
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__func__, ret);
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err:
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return ret;
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}
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static int exynos_smu_resume(struct platform_device *pdev,
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struct smu_data_setting *smu_set)
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{
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int ret = 0;
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struct exynos_smu *smu = NULL;
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if (!pdev || !smu_set) {
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pr_err("%s: Invalid input parameter.\n", __func__);
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ret = -EINVAL;
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goto err;
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}
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smu = platform_get_drvdata(pdev);
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ret = exynos_smc(SMC_CMD_FMP_SMU_RESUME, 0, smu_set->id, 0);
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if (ret)
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dev_err(smu->dev, "%s: Fail smc call for SMU resume. ret(%d)\n",
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__func__, ret);
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err:
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return ret;
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}
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static int exynos_smu_abort(struct platform_device *pdev,
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struct smu_data_setting *smu_set)
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{
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int ret = 0;
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if (!pdev || !smu_set) {
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pr_err("%s: Invalid input parameter.\n", __func__);
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ret = -EINVAL;
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goto err;
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}
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ret = exynos_smc(SMC_CMD_SMU, smu_set->command, smu_set->id, 0);
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err:
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return ret;
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}
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const struct exynos_smu_variant_ops exynos_smu_ops = {
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.name = "exynos-smu",
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.init = exynos_smu_init,
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.sec_config = exynos_smu_sec_config,
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.resume = exynos_smu_resume,
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.abort = exynos_smu_abort,
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};
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static struct of_device_id exynos_smu_match[] = {
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{
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.compatible = "samsung,exynos-smu",
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.data = (void *)&exynos_smu_ops,
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, exynos_smu_match);
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struct platform_device *exynos_smu_get_pdevice(struct device_node *node)
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{
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struct platform_device *smu_pdev = NULL;
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struct exynos_smu *smu = NULL;
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if (!node) {
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pr_err("%s: Invalid node\n", __func__);
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goto err;
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}
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if (!of_device_is_available(node)) {
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pr_err("%s: Unavailable device\n", __func__);
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goto err;
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}
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if (list_empty(&smu_devices)) {
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pr_err("%s: Invalie device list\n", __func__);
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smu_pdev = ERR_PTR(-EPROBE_DEFER);
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goto err;
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}
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list_for_each_entry(smu, &smu_devices, list) {
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if (smu->dev->of_node == node) {
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pr_info("%s: Found smu device\n", __func__);
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break;
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}
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}
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smu_pdev = to_platform_device(smu->dev);
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pr_info("%s: Matching platform device\n", __func__);
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err:
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return smu_pdev;
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}
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EXPORT_SYMBOL(exynos_smu_get_pdevice);
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struct exynos_smu_variant_ops *exynos_smu_get_variant_ops(struct device_node *node)
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{
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if (node) {
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const struct of_device_id *match;
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match = of_match_node(exynos_smu_match, node);
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if (match)
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return (struct exynos_smu_variant_ops *)(match->data);
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pr_err("%s: Error matching\n", __func__);
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} else {
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pr_err("%s: Invalid node\n", __func__);
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}
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return NULL;
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}
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EXPORT_SYMBOL(exynos_smu_get_variant_ops);
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static int exynos_smu_probe(struct platform_device *pdev)
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{
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int ret = 0;
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struct exynos_smu *smu;
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if (!pdev) {
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pr_err("%s: Invalid platform_device.\n", __func__);
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ret = -EINVAL;
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goto err_pdev;
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}
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smu = kzalloc(sizeof(struct exynos_smu), GFP_KERNEL);
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if (!smu) {
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ret = -ENOMEM;
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goto err_mem;
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}
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smu->dev = &pdev->dev;
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if (!smu->dev) {
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pr_err("%s: Invalid device.\n", __func__);
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ret = -EINVAL;
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goto err_dev;
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}
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platform_set_drvdata(pdev, smu);
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list_add_tail(&smu->list, &smu_devices);
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pr_info("%s: Exynos SMU driver is proved\n", __func__);
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return ret;
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err_dev:
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kfree(smu);
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err_mem:
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err_pdev:
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return ret;
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}
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static int exynos_smu_remove(struct platform_device *pdev)
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{
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struct exynos_smu *smu;
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smu = (struct exynos_smu *)platform_get_drvdata(pdev);
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if (!smu)
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return 0;
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kfree(smu);
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return 0;
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}
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static struct platform_driver exynos_smu_driver = {
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.driver = {
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.name = "exynos-smu",
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.owner = THIS_MODULE,
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.pm = NULL,
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.of_match_table = exynos_smu_match,
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},
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.probe = exynos_smu_probe,
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.remove = exynos_smu_remove,
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};
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static int __init smu_init(void)
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{
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return platform_driver_register(&exynos_smu_driver);
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}
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subsys_initcall(smu_init);
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static void __exit smu_exit(void)
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{
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platform_driver_unregister(&exynos_smu_driver);
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}
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module_exit(smu_exit);
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MODULE_DESCRIPTION("Exynos Specific SMU(Secure Management Unit) driver");
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