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80 lines
1.8 KiB
80 lines
1.8 KiB
// 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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static 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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clk_disable_unprepare(drvdata->clk); |
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return 0; |
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} |
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static 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 = clk_prepare_enable(drvdata->clk); |
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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 Cryptocell 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); |
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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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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_get(struct device *dev) |
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{ |
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int rc = pm_runtime_get_sync(dev); |
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if (rc < 0) { |
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pm_runtime_put_noidle(dev); |
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return rc; |
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} |
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return 0; |
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} |
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void cc_pm_put_suspend(struct device *dev) |
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{ |
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pm_runtime_mark_last_busy(dev); |
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pm_runtime_put_autosuspend(dev); |
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}
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