mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 04:15:27 +07:00
27b3b22dd9
Add support for the legacy CryptoCell 630 and 710 revs. Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (C) 2012-2018 ARM Limited or its affiliates. */
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/fips.h>
|
|
|
|
#include "cc_driver.h"
|
|
#include "cc_fips.h"
|
|
|
|
static void fips_dsr(unsigned long devarg);
|
|
|
|
struct cc_fips_handle {
|
|
struct tasklet_struct tasklet;
|
|
};
|
|
|
|
/* The function called once at driver entry point to check
|
|
* whether TEE FIPS error occurred.
|
|
*/
|
|
static bool cc_get_tee_fips_status(struct cc_drvdata *drvdata)
|
|
{
|
|
u32 reg;
|
|
|
|
reg = cc_ioread(drvdata, CC_REG(GPR_HOST));
|
|
return (reg == (CC_FIPS_SYNC_TEE_STATUS | CC_FIPS_SYNC_MODULE_OK));
|
|
}
|
|
|
|
/*
|
|
* This function should push the FIPS REE library status towards the TEE library
|
|
* by writing the error state to HOST_GPR0 register.
|
|
*/
|
|
void cc_set_ree_fips_status(struct cc_drvdata *drvdata, bool status)
|
|
{
|
|
int val = CC_FIPS_SYNC_REE_STATUS;
|
|
|
|
if (drvdata->hw_rev < CC_HW_REV_712)
|
|
return;
|
|
|
|
val |= (status ? CC_FIPS_SYNC_MODULE_OK : CC_FIPS_SYNC_MODULE_ERROR);
|
|
|
|
cc_iowrite(drvdata, CC_REG(HOST_GPR0), val);
|
|
}
|
|
|
|
void cc_fips_fini(struct cc_drvdata *drvdata)
|
|
{
|
|
struct cc_fips_handle *fips_h = drvdata->fips_handle;
|
|
|
|
if (drvdata->hw_rev < CC_HW_REV_712 || !fips_h)
|
|
return;
|
|
|
|
/* Kill tasklet */
|
|
tasklet_kill(&fips_h->tasklet);
|
|
|
|
kfree(fips_h);
|
|
drvdata->fips_handle = NULL;
|
|
}
|
|
|
|
void fips_handler(struct cc_drvdata *drvdata)
|
|
{
|
|
struct cc_fips_handle *fips_handle_ptr = drvdata->fips_handle;
|
|
|
|
if (drvdata->hw_rev < CC_HW_REV_712)
|
|
return;
|
|
|
|
tasklet_schedule(&fips_handle_ptr->tasklet);
|
|
}
|
|
|
|
static inline void tee_fips_error(struct device *dev)
|
|
{
|
|
if (fips_enabled)
|
|
panic("ccree: TEE reported cryptographic error in fips mode!\n");
|
|
else
|
|
dev_err(dev, "TEE reported error!\n");
|
|
}
|
|
|
|
/* Deferred service handler, run as interrupt-fired tasklet */
|
|
static void fips_dsr(unsigned long devarg)
|
|
{
|
|
struct cc_drvdata *drvdata = (struct cc_drvdata *)devarg;
|
|
struct device *dev = drvdata_to_dev(drvdata);
|
|
u32 irq, state, val;
|
|
|
|
irq = (drvdata->irq & (CC_GPR0_IRQ_MASK));
|
|
|
|
if (irq) {
|
|
state = cc_ioread(drvdata, CC_REG(GPR_HOST));
|
|
|
|
if (state != (CC_FIPS_SYNC_TEE_STATUS | CC_FIPS_SYNC_MODULE_OK))
|
|
tee_fips_error(dev);
|
|
}
|
|
|
|
/* after verifing that there is nothing to do,
|
|
* unmask AXI completion interrupt.
|
|
*/
|
|
val = (CC_REG(HOST_IMR) & ~irq);
|
|
cc_iowrite(drvdata, CC_REG(HOST_IMR), val);
|
|
}
|
|
|
|
/* The function called once at driver entry point .*/
|
|
int cc_fips_init(struct cc_drvdata *p_drvdata)
|
|
{
|
|
struct cc_fips_handle *fips_h;
|
|
struct device *dev = drvdata_to_dev(p_drvdata);
|
|
|
|
if (p_drvdata->hw_rev < CC_HW_REV_712)
|
|
return 0;
|
|
|
|
fips_h = kzalloc(sizeof(*fips_h), GFP_KERNEL);
|
|
if (!fips_h)
|
|
return -ENOMEM;
|
|
|
|
p_drvdata->fips_handle = fips_h;
|
|
|
|
dev_dbg(dev, "Initializing fips tasklet\n");
|
|
tasklet_init(&fips_h->tasklet, fips_dsr, (unsigned long)p_drvdata);
|
|
|
|
if (!cc_get_tee_fips_status(p_drvdata))
|
|
tee_fips_error(dev);
|
|
|
|
return 0;
|
|
}
|