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// 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
const struct dev_pm_ops ccree_pm = {
SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL)
};
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;
}
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, false);
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;
}
int cc_pm_get(struct device *dev)
{
int rc = 0;
struct cc_drvdata *drvdata = dev_get_drvdata(dev);
if (drvdata->pm_on)
rc = pm_runtime_get_sync(dev);
return (rc == 1 ? 0 : rc);
}
void cc_pm_put_suspend(struct device *dev)
{
struct cc_drvdata *drvdata = dev_get_drvdata(dev);
if (drvdata->pm_on) {
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
}
}
bool cc_pm_is_dev_suspended(struct device *dev)
{
/* check device state using runtime api */
return pm_runtime_suspended(dev);
}
int cc_pm_init(struct cc_drvdata *drvdata)
{
struct device *dev = drvdata_to_dev(drvdata);
/* must be before the enabling to avoid redundant suspending */
pm_runtime_set_autosuspend_delay(dev, CC_SUSPEND_TIMEOUT);
pm_runtime_use_autosuspend(dev);
/* set us as active - note we won't do PM ops until cc_pm_go()! */
return pm_runtime_set_active(dev);
}
/* enable the PM module*/
void cc_pm_go(struct cc_drvdata *drvdata)
{
pm_runtime_enable(drvdata_to_dev(drvdata));
drvdata->pm_on = true;
}
void cc_pm_fini(struct cc_drvdata *drvdata)
{
pm_runtime_disable(drvdata_to_dev(drvdata));
drvdata->pm_on = false;
}
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