159 lines
3.7 KiB
C
159 lines
3.7 KiB
C
/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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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 version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <mach/subsystem_restart.h>
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#include "peripheral-loader.h"
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#include "scm-pas.h"
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struct vidc_data {
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struct clk *smmu_iface;
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struct clk *core;
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struct pil_desc pil_desc;
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struct subsys_device *subsys;
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struct subsys_desc subsys_desc;
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};
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static int pil_vidc_init_image(struct pil_desc *pil, const u8 *metadata,
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size_t size)
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{
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return pas_init_image(PAS_VIDC, metadata, size);
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}
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static int pil_vidc_reset(struct pil_desc *pil)
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{
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int ret;
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struct vidc_data *drv = dev_get_drvdata(pil->dev);
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ret = clk_prepare_enable(drv->smmu_iface);
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if (ret)
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goto err_smmu;
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ret = clk_prepare_enable(drv->core);
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if (ret)
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goto err_core;
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ret = pas_auth_and_reset(PAS_VIDC);
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clk_disable_unprepare(drv->core);
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err_core:
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clk_disable_unprepare(drv->smmu_iface);
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err_smmu:
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return ret;
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}
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static int pil_vidc_shutdown(struct pil_desc *pil)
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{
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return pas_shutdown(PAS_VIDC);
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}
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static struct pil_reset_ops pil_vidc_ops = {
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.init_image = pil_vidc_init_image,
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.auth_and_reset = pil_vidc_reset,
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.shutdown = pil_vidc_shutdown,
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};
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#define subsys_to_drv(d) container_of(d, struct vidc_data, subsys_desc)
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static int vidc_start(const struct subsys_desc *desc)
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{
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struct vidc_data *drv = subsys_to_drv(desc);
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return pil_boot(&drv->pil_desc);
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}
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static void vidc_stop(const struct subsys_desc *desc)
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{
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struct vidc_data *drv = subsys_to_drv(desc);
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pil_shutdown(&drv->pil_desc);
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}
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static int __devinit pil_vidc_driver_probe(struct platform_device *pdev)
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{
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struct pil_desc *desc;
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struct vidc_data *drv;
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int ret;
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if (pas_supported(PAS_VIDC) < 0)
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return -ENOSYS;
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drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
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if (!drv)
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return -ENOMEM;
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platform_set_drvdata(pdev, drv);
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drv->smmu_iface = devm_clk_get(&pdev->dev, "smmu_iface_clk");
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if (IS_ERR(drv->smmu_iface))
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return PTR_ERR(drv->smmu_iface);
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drv->core = devm_clk_get(&pdev->dev, "core_clk");
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if (IS_ERR(drv->core))
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return PTR_ERR(drv->core);
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desc = &drv->pil_desc;
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desc->name = "vidc";
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desc->dev = &pdev->dev;
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desc->ops = &pil_vidc_ops;
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desc->owner = THIS_MODULE;
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ret = pil_desc_init(desc);
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if (ret)
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return ret;
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drv->subsys_desc.name = "vidc";
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drv->subsys_desc.dev = &pdev->dev;
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drv->subsys_desc.owner = THIS_MODULE;
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drv->subsys_desc.start = vidc_start;
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drv->subsys_desc.stop = vidc_stop;
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drv->subsys = subsys_register(&drv->subsys_desc);
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if (IS_ERR(drv->subsys)) {
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pil_desc_release(desc);
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return PTR_ERR(drv->subsys);
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}
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return 0;
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}
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static int __devexit pil_vidc_driver_exit(struct platform_device *pdev)
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{
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struct vidc_data *drv = platform_get_drvdata(pdev);
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subsys_unregister(drv->subsys);
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pil_desc_release(&drv->pil_desc);
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return 0;
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}
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static struct platform_driver pil_vidc_driver = {
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.probe = pil_vidc_driver_probe,
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.remove = __devexit_p(pil_vidc_driver_exit),
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.driver = {
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.name = "pil_vidc",
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.owner = THIS_MODULE,
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},
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};
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static int __init pil_vidc_init(void)
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{
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return platform_driver_register(&pil_vidc_driver);
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}
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module_init(pil_vidc_init);
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static void __exit pil_vidc_exit(void)
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{
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platform_driver_unregister(&pil_vidc_driver);
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}
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module_exit(pil_vidc_exit);
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MODULE_DESCRIPTION("Support for secure booting vidc images");
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MODULE_LICENSE("GPL v2");
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