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author | Gilad Ben-Yossef <gilad@benyossef.com> | 2018-01-09 10:24:29 +0000 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-09 16:00:07 +0100 |
commit | e7660d2d4714a146a80553e9355b40c467d60183 (patch) | |
tree | 2f1ebf583b0b49ff3b1ac6694c609664a0d682b5 /drivers/staging/ccree/cc_fips.c | |
parent | staging: lustre: remove LIBCFS_ALLOC, LIBCFS_FREE and related macros. (diff) | |
download | linux-dev-e7660d2d4714a146a80553e9355b40c467d60183.tar.xz linux-dev-e7660d2d4714a146a80553e9355b40c467d60183.zip |
staging: ccree: use a consistent file naming convention
The ccree driver source files were using an inconsistent
naming convention stemming from what the company was called
when they were added.
Move to a single consistent naming convention for better
code readability.
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/ccree/cc_fips.c')
-rw-r--r-- | drivers/staging/ccree/cc_fips.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/staging/ccree/cc_fips.c b/drivers/staging/ccree/cc_fips.c new file mode 100644 index 000000000000..b25c34e08717 --- /dev/null +++ b/drivers/staging/ccree/cc_fips.c @@ -0,0 +1,112 @@ +// 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; + + 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 (!fips_h) + return; /* Not allocated */ + + /* 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; + + 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); + + 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; +} |