cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cc_pm.c (1851B)

      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}