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/* 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/elf.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <mach/msm_iomap.h>
#include "peripheral-loader.h"
#include "scm-pas.h"
#define PPSS_RESET (MSM_CLK_CTL_BASE + 0x2594)
#define PPSS_RESET_PROC_RESET 0x2
#define PPSS_RESET_RESET 0x1
#define PPSS_PROC_CLK_CTL (MSM_CLK_CTL_BASE + 0x2588)
#define CLK_BRANCH_ENA 0x10
#define PPSS_HCLK_CTL (MSM_CLK_CTL_BASE + 0x2580)
#define CLK_HALT_DFAB_STATE (MSM_CLK_CTL_BASE + 0x2FC8)
static int init_image_dsps(struct pil_desc *pil, const u8 *metadata,
size_t size)
{
/* Bring memory and bus interface out of reset */
writel_relaxed(PPSS_RESET_PROC_RESET, PPSS_RESET);
writel_relaxed(CLK_BRANCH_ENA, PPSS_HCLK_CTL);
mb();
return 0;
}
static int reset_dsps(struct pil_desc *pil)
{
writel_relaxed(CLK_BRANCH_ENA, PPSS_PROC_CLK_CTL);
while (readl_relaxed(CLK_HALT_DFAB_STATE) & BIT(18))
cpu_relax();
/* Bring DSPS out of reset */
writel_relaxed(0x0, PPSS_RESET);
return 0;
}
static int shutdown_dsps(struct pil_desc *pil)
{
writel_relaxed(PPSS_RESET_PROC_RESET | PPSS_RESET_RESET, PPSS_RESET);
usleep_range(1000, 2000);
writel_relaxed(PPSS_RESET_PROC_RESET, PPSS_RESET);
writel_relaxed(0x0, PPSS_PROC_CLK_CTL);
return 0;
}
struct pil_reset_ops pil_dsps_ops = {
.init_image = init_image_dsps,
.auth_and_reset = reset_dsps,
.shutdown = shutdown_dsps,
};
static int init_image_dsps_trusted(struct pil_desc *pil, const u8 *metadata,
size_t size)
{
return pas_init_image(PAS_DSPS, metadata, size);
}
static int reset_dsps_trusted(struct pil_desc *pil)
{
return pas_auth_and_reset(PAS_DSPS);
}
static int shutdown_dsps_trusted(struct pil_desc *pil)
{
return pas_shutdown(PAS_DSPS);
}
struct pil_reset_ops pil_dsps_ops_trusted = {
.init_image = init_image_dsps_trusted,
.auth_and_reset = reset_dsps_trusted,
.shutdown = shutdown_dsps_trusted,
};
static int __devinit pil_dsps_driver_probe(struct platform_device *pdev)
{
struct pil_desc *desc;
struct pil_device *pil;
desc = devm_kzalloc(&pdev->dev, sizeof(*desc), GFP_KERNEL);
if (!desc)
return -ENOMEM;
desc->name = pdev->dev.platform_data;
desc->dev = &pdev->dev;
desc->owner = THIS_MODULE;
if (pas_supported(PAS_DSPS) > 0) {
desc->ops = &pil_dsps_ops_trusted;
dev_info(&pdev->dev, "using secure boot\n");
} else {
desc->ops = &pil_dsps_ops;
dev_info(&pdev->dev, "using non-secure boot\n");
}
pil = msm_pil_register(desc);
if (IS_ERR(pil))
return PTR_ERR(pil);
platform_set_drvdata(pdev, pil);
return 0;
}
static int __devexit pil_dsps_driver_exit(struct platform_device *pdev)
{
struct pil_device *pil = platform_get_drvdata(pdev);
msm_pil_unregister(pil);
return 0;
}
static struct platform_driver pil_dsps_driver = {
.probe = pil_dsps_driver_probe,
.remove = __devexit_p(pil_dsps_driver_exit),
.driver = {
.name = "pil_dsps",
.owner = THIS_MODULE,
},
};
static int __init pil_dsps_init(void)
{
return platform_driver_register(&pil_dsps_driver);
}
module_init(pil_dsps_init);
static void __exit pil_dsps_exit(void)
{
platform_driver_unregister(&pil_dsps_driver);
}
module_exit(pil_dsps_exit);
MODULE_DESCRIPTION("Support for booting sensors (DSPS) images");
MODULE_LICENSE("GPL v2");
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