83 lines · c
1// SPDX-License-Identifier: GPL-2.02/* 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 0x0116#define POWER_DOWN_DISABLE 0x0017 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 clk_disable_unprepare(drvdata->clk);45 return -EBUSY;46 }47 48 cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);49 rc = init_cc_regs(drvdata);50 if (rc) {51 dev_err(dev, "init_cc_regs (%x)\n", rc);52 clk_disable_unprepare(drvdata->clk);53 return rc;54 }55 /* check if tee fips error occurred during power down */56 cc_tee_handle_fips_error(drvdata);57 58 cc_init_hash_sram(drvdata);59 60 return 0;61}62 63const struct dev_pm_ops ccree_pm = {64 SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL)65};66 67int cc_pm_get(struct device *dev)68{69 int rc = pm_runtime_get_sync(dev);70 if (rc < 0) {71 pm_runtime_put_noidle(dev);72 return rc;73 }74 75 return 0;76}77 78void cc_pm_put_suspend(struct device *dev)79{80 pm_runtime_mark_last_busy(dev);81 pm_runtime_put_autosuspend(dev);82}83