81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */
|
||
|
|
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/pm_runtime.h>
|
||
|
|
#include "cc_driver.h"
|
||
|
|
#include "cc_buffer_mgr.h"
|
||
|
|
#include "cc_request_mgr.h"
|
||
|
|
#include "cc_sram_mgr.h"
|
||
|
|
#include "cc_hash.h"
|
||
|
|
#include "cc_pm.h"
|
||
|
|
#include "cc_fips.h"
|
||
|
|
|
||
|
|
#define POWER_DOWN_ENABLE 0x01
|
||
|
|
#define POWER_DOWN_DISABLE 0x00
|
||
|
|
|
||
|
|
static int cc_pm_suspend(struct device *dev)
|
||
|
|
{
|
||
|
|
struct cc_drvdata *drvdata = dev_get_drvdata(dev);
|
||
|
|
|
||
|
|
dev_dbg(dev, "set HOST_POWER_DOWN_EN\n");
|
||
|
|
fini_cc_regs(drvdata);
|
||
|
|
cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_ENABLE);
|
||
|
|
clk_disable_unprepare(drvdata->clk);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int cc_pm_resume(struct device *dev)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
struct cc_drvdata *drvdata = dev_get_drvdata(dev);
|
||
|
|
|
||
|
|
dev_dbg(dev, "unset HOST_POWER_DOWN_EN\n");
|
||
|
|
/* Enables the device source clk */
|
||
|
|
rc = clk_prepare_enable(drvdata->clk);
|
||
|
|
if (rc) {
|
||
|
|
dev_err(dev, "failed getting clock back on. We're toast.\n");
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
/* wait for Cryptocell reset completion */
|
||
|
|
if (!cc_wait_for_reset_completion(drvdata)) {
|
||
|
|
dev_err(dev, "Cryptocell reset not completed");
|
||
|
|
return -EBUSY;
|
||
|
|
}
|
||
|
|
|
||
|
|
cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
|
||
|
|
rc = init_cc_regs(drvdata);
|
||
|
|
if (rc) {
|
||
|
|
dev_err(dev, "init_cc_regs (%x)\n", rc);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
/* check if tee fips error occurred during power down */
|
||
|
|
cc_tee_handle_fips_error(drvdata);
|
||
|
|
|
||
|
|
cc_init_hash_sram(drvdata);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
const struct dev_pm_ops ccree_pm = {
|
||
|
|
SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL)
|
||
|
|
};
|
||
|
|
|
||
|
|
int cc_pm_get(struct device *dev)
|
||
|
|
{
|
||
|
|
int rc = pm_runtime_get_sync(dev);
|
||
|
|
if (rc < 0) {
|
||
|
|
pm_runtime_put_noidle(dev);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void cc_pm_put_suspend(struct device *dev)
|
||
|
|
{
|
||
|
|
pm_runtime_mark_last_busy(dev);
|
||
|
|
pm_runtime_put_autosuspend(dev);
|
||
|
|
}
|