134 lines
3 KiB
C
134 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2012-2018 ARM Limited or its affiliates. */
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#include <linux/kernel.h>
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#include <linux/fips.h>
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#include "cc_driver.h"
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#include "cc_fips.h"
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static void fips_dsr(unsigned long devarg);
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struct cc_fips_handle {
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struct tasklet_struct tasklet;
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};
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/* The function called once at driver entry point to check
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* whether TEE FIPS error occurred.
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*/
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static bool cc_get_tee_fips_status(struct cc_drvdata *drvdata)
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{
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u32 reg;
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reg = cc_ioread(drvdata, CC_REG(GPR_HOST));
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/* Did the TEE report status? */
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if (reg & CC_FIPS_SYNC_TEE_STATUS)
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/* Yes. Is it OK? */
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return (reg & CC_FIPS_SYNC_MODULE_OK);
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/* No. It's either not in use or will be reported later */
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return true;
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}
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/*
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* This function should push the FIPS REE library status towards the TEE library
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* by writing the error state to HOST_GPR0 register.
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*/
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void cc_set_ree_fips_status(struct cc_drvdata *drvdata, bool status)
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{
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int val = CC_FIPS_SYNC_REE_STATUS;
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if (drvdata->hw_rev < CC_HW_REV_712)
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return;
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val |= (status ? CC_FIPS_SYNC_MODULE_OK : CC_FIPS_SYNC_MODULE_ERROR);
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cc_iowrite(drvdata, CC_REG(HOST_GPR0), val);
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}
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void cc_fips_fini(struct cc_drvdata *drvdata)
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{
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struct cc_fips_handle *fips_h = drvdata->fips_handle;
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if (drvdata->hw_rev < CC_HW_REV_712 || !fips_h)
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return;
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/* Kill tasklet */
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tasklet_kill(&fips_h->tasklet);
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kfree(fips_h);
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drvdata->fips_handle = NULL;
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}
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void fips_handler(struct cc_drvdata *drvdata)
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{
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struct cc_fips_handle *fips_handle_ptr = drvdata->fips_handle;
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if (drvdata->hw_rev < CC_HW_REV_712)
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return;
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tasklet_schedule(&fips_handle_ptr->tasklet);
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}
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static inline void tee_fips_error(struct device *dev)
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{
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if (fips_enabled)
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panic("ccree: TEE reported cryptographic error in fips mode!\n");
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else
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dev_err(dev, "TEE reported error!\n");
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}
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/*
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* This function check if cryptocell tee fips error occurred
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* and in such case triggers system error
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*/
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void cc_tee_handle_fips_error(struct cc_drvdata *p_drvdata)
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{
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struct device *dev = drvdata_to_dev(p_drvdata);
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if (!cc_get_tee_fips_status(p_drvdata))
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tee_fips_error(dev);
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}
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/* Deferred service handler, run as interrupt-fired tasklet */
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static void fips_dsr(unsigned long devarg)
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{
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struct cc_drvdata *drvdata = (struct cc_drvdata *)devarg;
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u32 irq, val;
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irq = (drvdata->irq & (CC_GPR0_IRQ_MASK));
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if (irq) {
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cc_tee_handle_fips_error(drvdata);
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}
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/* after verifing that there is nothing to do,
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* unmask AXI completion interrupt.
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*/
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val = (CC_REG(HOST_IMR) & ~irq);
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cc_iowrite(drvdata, CC_REG(HOST_IMR), val);
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}
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/* The function called once at driver entry point .*/
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int cc_fips_init(struct cc_drvdata *p_drvdata)
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{
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struct cc_fips_handle *fips_h;
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struct device *dev = drvdata_to_dev(p_drvdata);
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if (p_drvdata->hw_rev < CC_HW_REV_712)
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return 0;
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fips_h = kzalloc(sizeof(*fips_h), GFP_KERNEL);
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if (!fips_h)
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return -ENOMEM;
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p_drvdata->fips_handle = fips_h;
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dev_dbg(dev, "Initializing fips tasklet\n");
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tasklet_init(&fips_h->tasklet, fips_dsr, (unsigned long)p_drvdata);
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cc_tee_handle_fips_error(p_drvdata);
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return 0;
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}
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