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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/crypto/ccree/cc_pm.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/crypto/ccree/cc_pm.c')
-rw-r--r-- | drivers/crypto/ccree/cc_pm.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/drivers/crypto/ccree/cc_pm.c b/drivers/crypto/ccree/cc_pm.c new file mode 100644 index 000000000..6124fbbbe --- /dev/null +++ b/drivers/crypto/ccree/cc_pm.c @@ -0,0 +1,82 @@ +// 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"); + clk_disable_unprepare(drvdata->clk); + 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); + clk_disable_unprepare(drvdata->clk); + 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); +} |