M7350/kernel/arch/arm/mach-msm/pil-vidc.c
2024-09-09 08:52:07 +00:00

159 lines
3.7 KiB
C

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