drivers/crypto/amcc/crypto4xx_sa.c

   1 /**
   2  * AMCC SoC PPC4xx Crypto Driver
   3  *
   4  * Copyright (c) 2008 Applied Micro Circuits Corporation.
   5  * All rights reserved. James Hsiao <jhsiao@amcc.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * @file crypto4xx_sa.c
  18  *
  19  * This file implements the security context
  20  * associate format.
  21  */
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/mod_devicetable.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/spinlock_types.h>
  28 #include <linux/highmem.h>
  29 #include <linux/scatterlist.h>
  30 #include <linux/crypto.h>
  31 #include <crypto/algapi.h>
  32 #include <crypto/des.h>
  33 #include "crypto4xx_reg_def.h"
  34 #include "crypto4xx_sa.h"
  35 #include "crypto4xx_core.h"
  36
  37 u32 get_dynamic_sa_offset_iv_field(struct crypto4xx_ctx *ctx)
  38 {
  39         u32 offset;
  40         union dynamic_sa_contents cts;
  41
  42         if (ctx->direction == DIR_INBOUND)
  43                 cts.w = ((struct dynamic_sa_ctl *)(ctx->sa_in))->sa_contents;
  44         else
  45                 cts.w = ((struct dynamic_sa_ctl *)(ctx->sa_out))->sa_contents;
  46         offset = cts.bf.key_size
  47                 + cts.bf.inner_size
  48                 + cts.bf.outer_size
  49                 + cts.bf.spi
  50                 + cts.bf.seq_num0
  51                 + cts.bf.seq_num1
  52                 + cts.bf.seq_num_mask0
  53                 + cts.bf.seq_num_mask1
  54                 + cts.bf.seq_num_mask2
  55                 + cts.bf.seq_num_mask3;
  56
  57         return sizeof(struct dynamic_sa_ctl) + offset * 4;
  58 }
  59
  60 u32 get_dynamic_sa_offset_state_ptr_field(struct crypto4xx_ctx *ctx)
  61 {
  62         u32 offset;
  63         union dynamic_sa_contents cts;
  64
  65         if (ctx->direction == DIR_INBOUND)
  66                 cts.w = ((struct dynamic_sa_ctl *) ctx->sa_in)->sa_contents;
  67         else
  68                 cts.w = ((struct dynamic_sa_ctl *) ctx->sa_out)->sa_contents;
  69         offset = cts.bf.key_size
  70                 + cts.bf.inner_size
  71                 + cts.bf.outer_size
  72                 + cts.bf.spi
  73                 + cts.bf.seq_num0
  74                 + cts.bf.seq_num1
  75                 + cts.bf.seq_num_mask0
  76                 + cts.bf.seq_num_mask1
  77                 + cts.bf.seq_num_mask2
  78                 + cts.bf.seq_num_mask3
  79                 + cts.bf.iv0
  80                 + cts.bf.iv1
  81                 + cts.bf.iv2
  82                 + cts.bf.iv3;
  83
  84         return sizeof(struct dynamic_sa_ctl) + offset * 4;
  85 }
  86
  87 u32 get_dynamic_sa_iv_size(struct crypto4xx_ctx *ctx)
  88 {
  89         union dynamic_sa_contents cts;
  90
  91         if (ctx->direction == DIR_INBOUND)
  92                 cts.w = ((struct dynamic_sa_ctl *) ctx->sa_in)->sa_contents;
  93         else
  94                 cts.w = ((struct dynamic_sa_ctl *) ctx->sa_out)->sa_contents;
  95         return (cts.bf.iv0 + cts.bf.iv1 + cts.bf.iv2 + cts.bf.iv3) * 4;
  96 }
  97
  98 u32 get_dynamic_sa_offset_key_field(struct crypto4xx_ctx *ctx)
  99 {
 100         union dynamic_sa_contents cts;
 101
 102         if (ctx->direction == DIR_INBOUND)
 103                 cts.w = ((struct dynamic_sa_ctl *) ctx->sa_in)->sa_contents;
 104         else
 105                 cts.w = ((struct dynamic_sa_ctl *) ctx->sa_out)->sa_contents;
 106
 107         return sizeof(struct dynamic_sa_ctl);
 108 }