mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-07 08:48:05 -04:00
127 lines
3.8 KiB
C
127 lines
3.8 KiB
C
/*
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* Exynos FMP MMC driver
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*
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* Copyright (C) 2015 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/pagemap.h>
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#include <linux/mmc/dw_mmc.h>
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#include <linux/smc.h>
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#include "dw_mmc-exynos.h"
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#if defined(CONFIG_MMC_DW_FMP_ECRYPT_FS)
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#include "fmp_derive_iv.h"
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#endif
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extern volatile unsigned int disk_key_flag;
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extern spinlock_t disk_key_lock;
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#define byte2word(b0, b1, b2, b3) \
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((unsigned int)(b0) << 24) | ((unsigned int)(b1) << 16) | ((unsigned int)(b2) << 8) | (b3)
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#define word_in(x, c) byte2word(((unsigned char *)(x) + 4 * (c))[0], ((unsigned char *)(x) + 4 * (c))[1], \
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((unsigned char *)(x) + 4 * (c))[2], ((unsigned char *)(x) + 4 * (c))[3])
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int fmp_map_sg(struct dw_mci *host, struct idmac_desc_64addr *desc, int idx,
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uint32_t sector_key, uint32_t sector, struct mmc_data *data)
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{
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#if defined(CONFIG_MMC_DW_FMP_DM_CRYPT)
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if ((sector_key & DW_MMC_ENCRYPTION_SECTOR_BEGIN) &&
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(host->pdata->quirks & DW_MCI_QUIRK_USE_SMU)) { /* disk encryption */
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int ret;
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/* disk algorithm selector */
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IDMAC_SET_DAS(desc, AES_XTS);
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desc->des2 |= IDMAC_DES2_DKL;
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/* Disk IV */
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desc->des28 = 0;
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desc->des29 = 0;
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desc->des30 = 0;
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desc->des31 = htonl(sector);
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/* Disk Enc Key, Tweak Key */
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if (disk_key_flag) {
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/* Disk Enc Key, Tweak Key */
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ret = exynos_smc(SMC_CMD_FMP, FMP_KEY_SET, EMMC0_FMP, 0);
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if (ret) {
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printk(KERN_ERR "Failed to smc call for FMP key setting: %x\n", ret);
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return ret;
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}
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spin_lock(&disk_key_lock);
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disk_key_flag = 0;
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spin_unlock(&disk_key_lock);
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}
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}
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#endif
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#if defined(CONFIG_MMC_DW_FMP_ECRYPT_FS)
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if ((sector_key & DW_MMC_FILE_ENCRYPTION_SECTOR_BEGIN) &&
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(host->pdata->quirks & DW_MCI_QUIRK_USE_SMU)) { /* file encryption */
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int ret;
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unsigned int aes_alg = 0;
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unsigned int j;
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unsigned int last_index = 0;
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unsigned long last_inode = 0;
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#ifdef CONFIG_CRYPTO_FIPS
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char extent_iv[SHA256_HASH_SIZE];
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#else
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char extent_iv[MD5_DIGEST_SIZE];
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#endif
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loff_t index;
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/* File algorithm selector*/
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if (!strncmp(sg_page(&data->sg[idx])->mapping->alg, "aes", sizeof("aes")))
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aes_alg = AES_CBC;
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else if (!strncmp(sg_page(&data->sg[idx])->mapping->alg, "aesxts", sizeof("aesxts")))
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aes_alg = AES_XTS;
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else {
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printk(KERN_ERR "Invalid file algorithm: %s\n", sg_page(&data->sg[idx])->mapping->alg);
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return -1;
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}
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IDMAC_SET_FAS(desc, aes_alg);
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/* File enc key size */
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switch (sg_page(&data->sg[idx])->mapping->key_length) {
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case 16:
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desc->des2 &= ~IDMAC_DES2_FKL;
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break;
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case 32:
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case 64:
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desc->des2 |= IDMAC_DES2_FKL;
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break;
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default:
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printk(KERN_ERR "Invalid file key length: %lx\n", sg_page(&data->sg[idx])->mapping->key_length);
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return -1;
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}
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index = sg_page(&data->sg[idx])->index;
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if ((last_index != index) || (last_inode != sg_page(&data->sg[idx])->mapping->host->i_ino)) {
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index = index - sg_page(&data->sg[idx])->mapping->sensitive_data_index;
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ret = file_enc_derive_iv(sg_page(&data->sg[idx])->mapping, index, extent_iv);
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if (ret) {
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printk(KERN_ERR "Error attemping to derive IV\n");
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return ret;
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}
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}
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last_index = sg_page(&data->sg[idx])->index;
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last_inode = sg_page(&data->sg[idx])->mapping->host->i_ino;
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/* File IV */
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desc->des8 = word_in(extent_iv, 3);
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desc->des9 = word_in(extent_iv, 2);
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desc->des10 = word_in(extent_iv, 1);
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desc->des11 = word_in(extent_iv, 0);
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/* File Enc key */
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for (j = 0; j < sg_page(&data->sg[idx])->mapping->key_length >> 2; j++)
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*(&(desc->des12) + j) =
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word_in(sg_page(&data->sg[idx])->mapping->key, (sg_page(&data->sg[idx])->mapping->key_length >> 2) - (j + 1));
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}
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#endif
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return 0;
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}
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