118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/pm_runtime.h>
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#include "cc_driver.h"
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#include "cc_buffer_mgr.h"
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#include "cc_request_mgr.h"
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#include "cc_sram_mgr.h"
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#include "cc_hash.h"
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#include "cc_pm.h"
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#include "cc_fips.h"
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#define POWER_DOWN_ENABLE 0x01
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#define POWER_DOWN_DISABLE 0x00
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const struct dev_pm_ops ccree_pm = {
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SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL)
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};
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int cc_pm_suspend(struct device *dev)
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{
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struct cc_drvdata *drvdata = dev_get_drvdata(dev);
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dev_dbg(dev, "set HOST_POWER_DOWN_EN\n");
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fini_cc_regs(drvdata);
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cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_ENABLE);
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cc_clk_off(drvdata);
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return 0;
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}
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int cc_pm_resume(struct device *dev)
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{
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int rc;
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struct cc_drvdata *drvdata = dev_get_drvdata(dev);
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dev_dbg(dev, "unset HOST_POWER_DOWN_EN\n");
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/* Enables the device source clk */
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rc = cc_clk_on(drvdata);
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if (rc) {
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dev_err(dev, "failed getting clock back on. We're toast.\n");
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return rc;
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}
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/* wait for Crytpcell reset completion */
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if (!cc_wait_for_reset_completion(drvdata)) {
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dev_err(dev, "Cryptocell reset not completed");
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return -EBUSY;
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}
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cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
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rc = init_cc_regs(drvdata, false);
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if (rc) {
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dev_err(dev, "init_cc_regs (%x)\n", rc);
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return rc;
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}
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/* check if tee fips error occurred during power down */
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cc_tee_handle_fips_error(drvdata);
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cc_init_hash_sram(drvdata);
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return 0;
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}
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int cc_pm_get(struct device *dev)
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{
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int rc = 0;
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struct cc_drvdata *drvdata = dev_get_drvdata(dev);
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if (drvdata->pm_on)
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rc = pm_runtime_get_sync(dev);
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return (rc == 1 ? 0 : rc);
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}
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int cc_pm_put_suspend(struct device *dev)
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{
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int rc = 0;
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struct cc_drvdata *drvdata = dev_get_drvdata(dev);
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if (drvdata->pm_on) {
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pm_runtime_mark_last_busy(dev);
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rc = pm_runtime_put_autosuspend(dev);
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}
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return rc;
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}
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bool cc_pm_is_dev_suspended(struct device *dev)
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{
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/* check device state using runtime api */
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return pm_runtime_suspended(dev);
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}
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int cc_pm_init(struct cc_drvdata *drvdata)
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{
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struct device *dev = drvdata_to_dev(drvdata);
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/* must be before the enabling to avoid resdundent suspending */
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pm_runtime_set_autosuspend_delay(dev, CC_SUSPEND_TIMEOUT);
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pm_runtime_use_autosuspend(dev);
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/* set us as active - note we won't do PM ops until cc_pm_go()! */
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return pm_runtime_set_active(dev);
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}
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/* enable the PM module*/
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void cc_pm_go(struct cc_drvdata *drvdata)
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{
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pm_runtime_enable(drvdata_to_dev(drvdata));
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drvdata->pm_on = true;
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}
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void cc_pm_fini(struct cc_drvdata *drvdata)
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{
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pm_runtime_disable(drvdata_to_dev(drvdata));
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drvdata->pm_on = false;
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}
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