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8c7849a302
Currently, a large part of the probe function runs before Runtime PM is
enabled. As the driver manages the device's clock manually, this may
work fine on some systems, but may break on platforms with a more
complex power hierarchy.
Fix this by moving the initialization of Runtime PM before the first
register access (in cc_wait_for_reset_completion()), and putting the
device to sleep only after the last access (in cc_set_ree_fips_status()).
This allows to remove the pm_on flag, which was used to track manually
if Runtime PM had been enabled or not.
Remove the cc_pm_{init,go,fini}() wrappers, as they are called only
once, and obscure operation.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
82 lines
1.9 KiB
C
82 lines
1.9 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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clk_disable_unprepare(drvdata->clk);
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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 = 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, 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 = pm_runtime_get_sync(dev);
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return (rc == 1 ? 0 : rc);
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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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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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