1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2012-2018 ARM Limited or its affiliates. */
4 #include <linux/kernel.h>
5 #include <linux/fips.h>
10 static void fips_dsr(unsigned long devarg
);
12 struct cc_fips_handle
{
13 struct tasklet_struct tasklet
;
16 /* The function called once at driver entry point to check
17 * whether TEE FIPS error occurred.
19 static bool cc_get_tee_fips_status(struct cc_drvdata
*drvdata
)
23 reg
= cc_ioread(drvdata
, CC_REG(GPR_HOST
));
24 /* Did the TEE report status? */
25 if (reg
& CC_FIPS_SYNC_TEE_STATUS
)
27 return (reg
& CC_FIPS_SYNC_MODULE_OK
);
29 /* No. It's either not in use or will be reported later */
34 * This function should push the FIPS REE library status towards the TEE library
35 * by writing the error state to HOST_GPR0 register.
37 void cc_set_ree_fips_status(struct cc_drvdata
*drvdata
, bool status
)
39 int val
= CC_FIPS_SYNC_REE_STATUS
;
41 if (drvdata
->hw_rev
< CC_HW_REV_712
)
44 val
|= (status
? CC_FIPS_SYNC_MODULE_OK
: CC_FIPS_SYNC_MODULE_ERROR
);
46 cc_iowrite(drvdata
, CC_REG(HOST_GPR0
), val
);
49 void cc_fips_fini(struct cc_drvdata
*drvdata
)
51 struct cc_fips_handle
*fips_h
= drvdata
->fips_handle
;
53 if (drvdata
->hw_rev
< CC_HW_REV_712
|| !fips_h
)
57 tasklet_kill(&fips_h
->tasklet
);
60 drvdata
->fips_handle
= NULL
;
63 void fips_handler(struct cc_drvdata
*drvdata
)
65 struct cc_fips_handle
*fips_handle_ptr
= drvdata
->fips_handle
;
67 if (drvdata
->hw_rev
< CC_HW_REV_712
)
70 tasklet_schedule(&fips_handle_ptr
->tasklet
);
73 static inline void tee_fips_error(struct device
*dev
)
76 panic("ccree: TEE reported cryptographic error in fips mode!\n");
78 dev_err(dev
, "TEE reported error!\n");
82 * This function check if cryptocell tee fips error occurred
83 * and in such case triggers system error
85 void cc_tee_handle_fips_error(struct cc_drvdata
*p_drvdata
)
87 struct device
*dev
= drvdata_to_dev(p_drvdata
);
89 if (!cc_get_tee_fips_status(p_drvdata
))
93 /* Deferred service handler, run as interrupt-fired tasklet */
94 static void fips_dsr(unsigned long devarg
)
96 struct cc_drvdata
*drvdata
= (struct cc_drvdata
*)devarg
;
99 irq
= (drvdata
->irq
& (CC_GPR0_IRQ_MASK
));
102 cc_tee_handle_fips_error(drvdata
);
105 /* after verifing that there is nothing to do,
106 * unmask AXI completion interrupt.
108 val
= (CC_REG(HOST_IMR
) & ~irq
);
109 cc_iowrite(drvdata
, CC_REG(HOST_IMR
), val
);
112 /* The function called once at driver entry point .*/
113 int cc_fips_init(struct cc_drvdata
*p_drvdata
)
115 struct cc_fips_handle
*fips_h
;
116 struct device
*dev
= drvdata_to_dev(p_drvdata
);
118 if (p_drvdata
->hw_rev
< CC_HW_REV_712
)
121 fips_h
= kzalloc(sizeof(*fips_h
), GFP_KERNEL
);
125 p_drvdata
->fips_handle
= fips_h
;
127 dev_dbg(dev
, "Initializing fips tasklet\n");
128 tasklet_init(&fips_h
->tasklet
, fips_dsr
, (unsigned long)p_drvdata
);
130 cc_tee_handle_fips_error(p_drvdata
);