linux/drivers/crypto/ccree/cc_pm.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */
   3
   4#include <linux/kernel.h>
   5#include <linux/interrupt.h>
   6#include <linux/pm_runtime.h>
   7#include "cc_driver.h"
   8#include "cc_buffer_mgr.h"
   9#include "cc_request_mgr.h"
  10#include "cc_sram_mgr.h"
  11#include "cc_hash.h"
  12#include "cc_pm.h"
  13#include "cc_fips.h"
  14
  15#define POWER_DOWN_ENABLE 0x01
  16#define POWER_DOWN_DISABLE 0x00
  17
  18static int cc_pm_suspend(struct device *dev)
  19{
  20        struct cc_drvdata *drvdata = dev_get_drvdata(dev);
  21
  22        dev_dbg(dev, "set HOST_POWER_DOWN_EN\n");
  23        fini_cc_regs(drvdata);
  24        cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_ENABLE);
  25        clk_disable_unprepare(drvdata->clk);
  26        return 0;
  27}
  28
  29static int cc_pm_resume(struct device *dev)
  30{
  31        int rc;
  32        struct cc_drvdata *drvdata = dev_get_drvdata(dev);
  33
  34        dev_dbg(dev, "unset HOST_POWER_DOWN_EN\n");
  35        /* Enables the device source clk */
  36        rc = clk_prepare_enable(drvdata->clk);
  37        if (rc) {
  38                dev_err(dev, "failed getting clock back on. We're toast.\n");
  39                return rc;
  40        }
  41        /* wait for Cryptocell reset completion */
  42        if (!cc_wait_for_reset_completion(drvdata)) {
  43                dev_err(dev, "Cryptocell reset not completed");
  44                return -EBUSY;
  45        }
  46
  47        cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
  48        rc = init_cc_regs(drvdata);
  49        if (rc) {
  50                dev_err(dev, "init_cc_regs (%x)\n", rc);
  51                return rc;
  52        }
  53        /* check if tee fips error occurred during power down */
  54        cc_tee_handle_fips_error(drvdata);
  55
  56        cc_init_hash_sram(drvdata);
  57
  58        return 0;
  59}
  60
  61const struct dev_pm_ops ccree_pm = {
  62        SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL)
  63};
  64
  65int cc_pm_get(struct device *dev)
  66{
  67        int rc = pm_runtime_get_sync(dev);
  68        if (rc < 0) {
  69                pm_runtime_put_noidle(dev);
  70                return rc;
  71        }
  72
  73        return 0;
  74}
  75
  76void cc_pm_put_suspend(struct device *dev)
  77{
  78        pm_runtime_mark_last_busy(dev);
  79        pm_runtime_put_autosuspend(dev);
  80}
  81