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49cfe4db2d
CONFIG_HOTPLUG is going away as an option. As a result, the __dev* markings need to be removed. This change removes the use of __devinit, __devexit_p, __devinitdata, and __devexit from these drivers. Based on patches originally written by Bill Pemberton, but redone by me in order to handle some of the coding style issues better, by hand. Cc: Bill Pemberton <wfp5p@virginia.edu> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "David S. Miller" <davem@davemloft.net> Cc: Kent Yoder <key@linux.vnet.ibm.com> Cc: Jamie Iles <jamie@jamieiles.com> Cc: Kim Phillips <kim.phillips@freescale.com> Cc: Shengzhou Liu <Shengzhou.Liu@freescale.com> Cc: Alex Porosanu <alexandru.porosanu@freescale.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1098 lines
27 KiB
C
1098 lines
27 KiB
C
/*
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* drivers/crypto/tegra-aes.c
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*
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* Driver for NVIDIA Tegra AES hardware engine residing inside the
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* Bit Stream Engine for Video (BSEV) hardware block.
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*
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* The programming sequence for this engine is with the help
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* of commands which travel via a command queue residing between the
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* CPU and the BSEV block. The BSEV engine has an internal RAM (VRAM)
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* where the final input plaintext, keys and the IV have to be copied
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* before starting the encrypt/decrypt operation.
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*
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* Copyright (c) 2010, NVIDIA Corporation.
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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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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/clk.h>
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#include <linux/platform_device.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/mutex.h>
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#include <linux/interrupt.h>
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#include <linux/completion.h>
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#include <linux/workqueue.h>
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#include <crypto/scatterwalk.h>
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#include <crypto/aes.h>
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#include <crypto/internal/rng.h>
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#include "tegra-aes.h"
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#define FLAGS_MODE_MASK 0x00FF
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#define FLAGS_ENCRYPT BIT(0)
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#define FLAGS_CBC BIT(1)
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#define FLAGS_GIV BIT(2)
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#define FLAGS_RNG BIT(3)
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#define FLAGS_OFB BIT(4)
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#define FLAGS_NEW_KEY BIT(5)
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#define FLAGS_NEW_IV BIT(6)
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#define FLAGS_INIT BIT(7)
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#define FLAGS_FAST BIT(8)
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#define FLAGS_BUSY 9
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/*
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* Defines AES engine Max process bytes size in one go, which takes 1 msec.
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* AES engine spends about 176 cycles/16-bytes or 11 cycles/byte
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* The duration CPU can use the BSE to 1 msec, then the number of available
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* cycles of AVP/BSE is 216K. In this duration, AES can process 216/11 ~= 19KB
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* Based on this AES_HW_DMA_BUFFER_SIZE_BYTES is configured to 16KB.
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*/
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#define AES_HW_DMA_BUFFER_SIZE_BYTES 0x4000
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/*
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* The key table length is 64 bytes
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* (This includes first upto 32 bytes key + 16 bytes original initial vector
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* and 16 bytes updated initial vector)
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*/
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#define AES_HW_KEY_TABLE_LENGTH_BYTES 64
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/*
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* The memory being used is divides as follows:
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* 1. Key - 32 bytes
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* 2. Original IV - 16 bytes
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* 3. Updated IV - 16 bytes
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* 4. Key schedule - 256 bytes
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*
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* 1+2+3 constitute the hw key table.
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*/
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#define AES_HW_IV_SIZE 16
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#define AES_HW_KEYSCHEDULE_LEN 256
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#define AES_IVKEY_SIZE (AES_HW_KEY_TABLE_LENGTH_BYTES + AES_HW_KEYSCHEDULE_LEN)
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/* Define commands required for AES operation */
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enum {
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CMD_BLKSTARTENGINE = 0x0E,
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CMD_DMASETUP = 0x10,
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CMD_DMACOMPLETE = 0x11,
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CMD_SETTABLE = 0x15,
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CMD_MEMDMAVD = 0x22,
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};
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/* Define sub-commands */
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enum {
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SUBCMD_VRAM_SEL = 0x1,
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SUBCMD_CRYPTO_TABLE_SEL = 0x3,
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SUBCMD_KEY_TABLE_SEL = 0x8,
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};
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/* memdma_vd command */
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#define MEMDMA_DIR_DTOVRAM 0 /* sdram -> vram */
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#define MEMDMA_DIR_VTODRAM 1 /* vram -> sdram */
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#define MEMDMA_DIR_SHIFT 25
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#define MEMDMA_NUM_WORDS_SHIFT 12
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/* command queue bit shifts */
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enum {
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CMDQ_KEYTABLEADDR_SHIFT = 0,
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CMDQ_KEYTABLEID_SHIFT = 17,
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CMDQ_VRAMSEL_SHIFT = 23,
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CMDQ_TABLESEL_SHIFT = 24,
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CMDQ_OPCODE_SHIFT = 26,
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};
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/*
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* The secure key slot contains a unique secure key generated
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* and loaded by the bootloader. This slot is marked as non-accessible
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* to the kernel.
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*/
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#define SSK_SLOT_NUM 4
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#define AES_NR_KEYSLOTS 8
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#define TEGRA_AES_QUEUE_LENGTH 50
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#define DEFAULT_RNG_BLK_SZ 16
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/* The command queue depth */
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#define AES_HW_MAX_ICQ_LENGTH 5
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struct tegra_aes_slot {
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struct list_head node;
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int slot_num;
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};
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static struct tegra_aes_slot ssk = {
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.slot_num = SSK_SLOT_NUM,
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};
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struct tegra_aes_reqctx {
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unsigned long mode;
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};
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struct tegra_aes_dev {
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struct device *dev;
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void __iomem *io_base;
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dma_addr_t ivkey_phys_base;
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void __iomem *ivkey_base;
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struct clk *aes_clk;
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struct tegra_aes_ctx *ctx;
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int irq;
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unsigned long flags;
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struct completion op_complete;
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u32 *buf_in;
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dma_addr_t dma_buf_in;
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u32 *buf_out;
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dma_addr_t dma_buf_out;
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u8 *iv;
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u8 dt[DEFAULT_RNG_BLK_SZ];
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int ivlen;
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u64 ctr;
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spinlock_t lock;
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struct crypto_queue queue;
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struct tegra_aes_slot *slots;
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struct ablkcipher_request *req;
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size_t total;
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struct scatterlist *in_sg;
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size_t in_offset;
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struct scatterlist *out_sg;
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size_t out_offset;
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};
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static struct tegra_aes_dev *aes_dev;
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struct tegra_aes_ctx {
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struct tegra_aes_dev *dd;
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unsigned long flags;
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struct tegra_aes_slot *slot;
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u8 key[AES_MAX_KEY_SIZE];
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size_t keylen;
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};
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static struct tegra_aes_ctx rng_ctx = {
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.flags = FLAGS_NEW_KEY,
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.keylen = AES_KEYSIZE_128,
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};
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/* keep registered devices data here */
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static struct list_head dev_list;
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static DEFINE_SPINLOCK(list_lock);
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static DEFINE_MUTEX(aes_lock);
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static void aes_workqueue_handler(struct work_struct *work);
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static DECLARE_WORK(aes_work, aes_workqueue_handler);
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static struct workqueue_struct *aes_wq;
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extern unsigned long long tegra_chip_uid(void);
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static inline u32 aes_readl(struct tegra_aes_dev *dd, u32 offset)
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{
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return readl(dd->io_base + offset);
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}
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static inline void aes_writel(struct tegra_aes_dev *dd, u32 val, u32 offset)
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{
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writel(val, dd->io_base + offset);
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}
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static int aes_start_crypt(struct tegra_aes_dev *dd, u32 in_addr, u32 out_addr,
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int nblocks, int mode, bool upd_iv)
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{
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u32 cmdq[AES_HW_MAX_ICQ_LENGTH];
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int i, eng_busy, icq_empty, ret;
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u32 value;
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/* reset all the interrupt bits */
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aes_writel(dd, 0xFFFFFFFF, TEGRA_AES_INTR_STATUS);
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/* enable error, dma xfer complete interrupts */
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aes_writel(dd, 0x33, TEGRA_AES_INT_ENB);
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cmdq[0] = CMD_DMASETUP << CMDQ_OPCODE_SHIFT;
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cmdq[1] = in_addr;
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cmdq[2] = CMD_BLKSTARTENGINE << CMDQ_OPCODE_SHIFT | (nblocks-1);
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cmdq[3] = CMD_DMACOMPLETE << CMDQ_OPCODE_SHIFT;
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value = aes_readl(dd, TEGRA_AES_CMDQUE_CONTROL);
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/* access SDRAM through AHB */
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value &= ~TEGRA_AES_CMDQ_CTRL_SRC_STM_SEL_FIELD;
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value &= ~TEGRA_AES_CMDQ_CTRL_DST_STM_SEL_FIELD;
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value |= TEGRA_AES_CMDQ_CTRL_SRC_STM_SEL_FIELD |
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TEGRA_AES_CMDQ_CTRL_DST_STM_SEL_FIELD |
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TEGRA_AES_CMDQ_CTRL_ICMDQEN_FIELD;
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aes_writel(dd, value, TEGRA_AES_CMDQUE_CONTROL);
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dev_dbg(dd->dev, "cmd_q_ctrl=0x%x", value);
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value = (0x1 << TEGRA_AES_SECURE_INPUT_ALG_SEL_SHIFT) |
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((dd->ctx->keylen * 8) <<
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TEGRA_AES_SECURE_INPUT_KEY_LEN_SHIFT) |
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((u32)upd_iv << TEGRA_AES_SECURE_IV_SELECT_SHIFT);
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if (mode & FLAGS_CBC) {
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value |= ((((mode & FLAGS_ENCRYPT) ? 2 : 3)
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<< TEGRA_AES_SECURE_XOR_POS_SHIFT) |
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(((mode & FLAGS_ENCRYPT) ? 2 : 3)
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<< TEGRA_AES_SECURE_VCTRAM_SEL_SHIFT) |
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((mode & FLAGS_ENCRYPT) ? 1 : 0)
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<< TEGRA_AES_SECURE_CORE_SEL_SHIFT);
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} else if (mode & FLAGS_OFB) {
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value |= ((TEGRA_AES_SECURE_XOR_POS_FIELD) |
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(2 << TEGRA_AES_SECURE_INPUT_SEL_SHIFT) |
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(TEGRA_AES_SECURE_CORE_SEL_FIELD));
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} else if (mode & FLAGS_RNG) {
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value |= (((mode & FLAGS_ENCRYPT) ? 1 : 0)
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<< TEGRA_AES_SECURE_CORE_SEL_SHIFT |
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TEGRA_AES_SECURE_RNG_ENB_FIELD);
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} else {
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value |= (((mode & FLAGS_ENCRYPT) ? 1 : 0)
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<< TEGRA_AES_SECURE_CORE_SEL_SHIFT);
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}
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dev_dbg(dd->dev, "secure_in_sel=0x%x", value);
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aes_writel(dd, value, TEGRA_AES_SECURE_INPUT_SELECT);
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aes_writel(dd, out_addr, TEGRA_AES_SECURE_DEST_ADDR);
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INIT_COMPLETION(dd->op_complete);
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for (i = 0; i < AES_HW_MAX_ICQ_LENGTH - 1; i++) {
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do {
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value = aes_readl(dd, TEGRA_AES_INTR_STATUS);
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eng_busy = value & TEGRA_AES_ENGINE_BUSY_FIELD;
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icq_empty = value & TEGRA_AES_ICQ_EMPTY_FIELD;
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} while (eng_busy & (!icq_empty));
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aes_writel(dd, cmdq[i], TEGRA_AES_ICMDQUE_WR);
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}
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ret = wait_for_completion_timeout(&dd->op_complete,
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msecs_to_jiffies(150));
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if (ret == 0) {
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dev_err(dd->dev, "timed out (0x%x)\n",
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aes_readl(dd, TEGRA_AES_INTR_STATUS));
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return -ETIMEDOUT;
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}
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aes_writel(dd, cmdq[AES_HW_MAX_ICQ_LENGTH - 1], TEGRA_AES_ICMDQUE_WR);
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return 0;
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}
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static void aes_release_key_slot(struct tegra_aes_slot *slot)
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{
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if (slot->slot_num == SSK_SLOT_NUM)
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return;
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spin_lock(&list_lock);
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list_add_tail(&slot->node, &dev_list);
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slot = NULL;
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spin_unlock(&list_lock);
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}
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static struct tegra_aes_slot *aes_find_key_slot(void)
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{
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struct tegra_aes_slot *slot = NULL;
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struct list_head *new_head;
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int empty;
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spin_lock(&list_lock);
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empty = list_empty(&dev_list);
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if (!empty) {
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slot = list_entry(&dev_list, struct tegra_aes_slot, node);
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new_head = dev_list.next;
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list_del(&dev_list);
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dev_list.next = new_head->next;
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dev_list.prev = NULL;
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}
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spin_unlock(&list_lock);
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return slot;
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}
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static int aes_set_key(struct tegra_aes_dev *dd)
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{
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u32 value, cmdq[2];
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struct tegra_aes_ctx *ctx = dd->ctx;
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int eng_busy, icq_empty, dma_busy;
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bool use_ssk = false;
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/* use ssk? */
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if (!dd->ctx->slot) {
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dev_dbg(dd->dev, "using ssk");
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dd->ctx->slot = &ssk;
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use_ssk = true;
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}
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/* enable key schedule generation in hardware */
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value = aes_readl(dd, TEGRA_AES_SECURE_CONFIG_EXT);
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value &= ~TEGRA_AES_SECURE_KEY_SCH_DIS_FIELD;
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aes_writel(dd, value, TEGRA_AES_SECURE_CONFIG_EXT);
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/* select the key slot */
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value = aes_readl(dd, TEGRA_AES_SECURE_CONFIG);
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value &= ~TEGRA_AES_SECURE_KEY_INDEX_FIELD;
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value |= (ctx->slot->slot_num << TEGRA_AES_SECURE_KEY_INDEX_SHIFT);
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aes_writel(dd, value, TEGRA_AES_SECURE_CONFIG);
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if (use_ssk)
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return 0;
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/* copy the key table from sdram to vram */
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cmdq[0] = CMD_MEMDMAVD << CMDQ_OPCODE_SHIFT |
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MEMDMA_DIR_DTOVRAM << MEMDMA_DIR_SHIFT |
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AES_HW_KEY_TABLE_LENGTH_BYTES / sizeof(u32) <<
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MEMDMA_NUM_WORDS_SHIFT;
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cmdq[1] = (u32)dd->ivkey_phys_base;
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aes_writel(dd, cmdq[0], TEGRA_AES_ICMDQUE_WR);
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aes_writel(dd, cmdq[1], TEGRA_AES_ICMDQUE_WR);
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do {
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value = aes_readl(dd, TEGRA_AES_INTR_STATUS);
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eng_busy = value & TEGRA_AES_ENGINE_BUSY_FIELD;
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icq_empty = value & TEGRA_AES_ICQ_EMPTY_FIELD;
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dma_busy = value & TEGRA_AES_DMA_BUSY_FIELD;
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} while (eng_busy & (!icq_empty) & dma_busy);
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/* settable command to get key into internal registers */
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value = CMD_SETTABLE << CMDQ_OPCODE_SHIFT |
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SUBCMD_CRYPTO_TABLE_SEL << CMDQ_TABLESEL_SHIFT |
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SUBCMD_VRAM_SEL << CMDQ_VRAMSEL_SHIFT |
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(SUBCMD_KEY_TABLE_SEL | ctx->slot->slot_num) <<
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CMDQ_KEYTABLEID_SHIFT;
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aes_writel(dd, value, TEGRA_AES_ICMDQUE_WR);
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do {
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value = aes_readl(dd, TEGRA_AES_INTR_STATUS);
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eng_busy = value & TEGRA_AES_ENGINE_BUSY_FIELD;
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icq_empty = value & TEGRA_AES_ICQ_EMPTY_FIELD;
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} while (eng_busy & (!icq_empty));
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return 0;
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}
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static int tegra_aes_handle_req(struct tegra_aes_dev *dd)
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{
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struct crypto_async_request *async_req, *backlog;
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struct crypto_ablkcipher *tfm;
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struct tegra_aes_ctx *ctx;
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struct tegra_aes_reqctx *rctx;
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struct ablkcipher_request *req;
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unsigned long flags;
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int dma_max = AES_HW_DMA_BUFFER_SIZE_BYTES;
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int ret = 0, nblocks, total;
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int count = 0;
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dma_addr_t addr_in, addr_out;
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struct scatterlist *in_sg, *out_sg;
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if (!dd)
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return -EINVAL;
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spin_lock_irqsave(&dd->lock, flags);
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backlog = crypto_get_backlog(&dd->queue);
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async_req = crypto_dequeue_request(&dd->queue);
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if (!async_req)
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clear_bit(FLAGS_BUSY, &dd->flags);
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spin_unlock_irqrestore(&dd->lock, flags);
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if (!async_req)
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return -ENODATA;
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if (backlog)
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backlog->complete(backlog, -EINPROGRESS);
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req = ablkcipher_request_cast(async_req);
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dev_dbg(dd->dev, "%s: get new req\n", __func__);
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if (!req->src || !req->dst)
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return -EINVAL;
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/* take mutex to access the aes hw */
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mutex_lock(&aes_lock);
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/* assign new request to device */
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dd->req = req;
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dd->total = req->nbytes;
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dd->in_offset = 0;
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dd->in_sg = req->src;
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dd->out_offset = 0;
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dd->out_sg = req->dst;
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in_sg = dd->in_sg;
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out_sg = dd->out_sg;
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total = dd->total;
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tfm = crypto_ablkcipher_reqtfm(req);
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rctx = ablkcipher_request_ctx(req);
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ctx = crypto_ablkcipher_ctx(tfm);
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rctx->mode &= FLAGS_MODE_MASK;
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dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
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dd->iv = (u8 *)req->info;
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dd->ivlen = crypto_ablkcipher_ivsize(tfm);
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/* assign new context to device */
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ctx->dd = dd;
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dd->ctx = ctx;
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if (ctx->flags & FLAGS_NEW_KEY) {
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/* copy the key */
|
|
memcpy(dd->ivkey_base, ctx->key, ctx->keylen);
|
|
memset(dd->ivkey_base + ctx->keylen, 0, AES_HW_KEY_TABLE_LENGTH_BYTES - ctx->keylen);
|
|
aes_set_key(dd);
|
|
ctx->flags &= ~FLAGS_NEW_KEY;
|
|
}
|
|
|
|
if (((dd->flags & FLAGS_CBC) || (dd->flags & FLAGS_OFB)) && dd->iv) {
|
|
/* set iv to the aes hw slot
|
|
* Hw generates updated iv only after iv is set in slot.
|
|
* So key and iv is passed asynchronously.
|
|
*/
|
|
memcpy(dd->buf_in, dd->iv, dd->ivlen);
|
|
|
|
ret = aes_start_crypt(dd, (u32)dd->dma_buf_in,
|
|
dd->dma_buf_out, 1, FLAGS_CBC, false);
|
|
if (ret < 0) {
|
|
dev_err(dd->dev, "aes_start_crypt fail(%d)\n", ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
while (total) {
|
|
dev_dbg(dd->dev, "remain: %d\n", total);
|
|
ret = dma_map_sg(dd->dev, in_sg, 1, DMA_TO_DEVICE);
|
|
if (!ret) {
|
|
dev_err(dd->dev, "dma_map_sg() error\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = dma_map_sg(dd->dev, out_sg, 1, DMA_FROM_DEVICE);
|
|
if (!ret) {
|
|
dev_err(dd->dev, "dma_map_sg() error\n");
|
|
dma_unmap_sg(dd->dev, dd->in_sg,
|
|
1, DMA_TO_DEVICE);
|
|
goto out;
|
|
}
|
|
|
|
addr_in = sg_dma_address(in_sg);
|
|
addr_out = sg_dma_address(out_sg);
|
|
dd->flags |= FLAGS_FAST;
|
|
count = min_t(int, sg_dma_len(in_sg), dma_max);
|
|
WARN_ON(sg_dma_len(in_sg) != sg_dma_len(out_sg));
|
|
nblocks = DIV_ROUND_UP(count, AES_BLOCK_SIZE);
|
|
|
|
ret = aes_start_crypt(dd, addr_in, addr_out, nblocks,
|
|
dd->flags, true);
|
|
|
|
dma_unmap_sg(dd->dev, out_sg, 1, DMA_FROM_DEVICE);
|
|
dma_unmap_sg(dd->dev, in_sg, 1, DMA_TO_DEVICE);
|
|
|
|
if (ret < 0) {
|
|
dev_err(dd->dev, "aes_start_crypt fail(%d)\n", ret);
|
|
goto out;
|
|
}
|
|
dd->flags &= ~FLAGS_FAST;
|
|
|
|
dev_dbg(dd->dev, "out: copied %d\n", count);
|
|
total -= count;
|
|
in_sg = sg_next(in_sg);
|
|
out_sg = sg_next(out_sg);
|
|
WARN_ON(((total != 0) && (!in_sg || !out_sg)));
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&aes_lock);
|
|
|
|
dd->total = total;
|
|
|
|
if (dd->req->base.complete)
|
|
dd->req->base.complete(&dd->req->base, ret);
|
|
|
|
dev_dbg(dd->dev, "%s: exit\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
static int tegra_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct tegra_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
|
|
struct tegra_aes_dev *dd = aes_dev;
|
|
struct tegra_aes_slot *key_slot;
|
|
|
|
if ((keylen != AES_KEYSIZE_128) && (keylen != AES_KEYSIZE_192) &&
|
|
(keylen != AES_KEYSIZE_256)) {
|
|
dev_err(dd->dev, "unsupported key size\n");
|
|
crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev_dbg(dd->dev, "keylen: %d\n", keylen);
|
|
|
|
ctx->dd = dd;
|
|
|
|
if (key) {
|
|
if (!ctx->slot) {
|
|
key_slot = aes_find_key_slot();
|
|
if (!key_slot) {
|
|
dev_err(dd->dev, "no empty slot\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ctx->slot = key_slot;
|
|
}
|
|
|
|
memcpy(ctx->key, key, keylen);
|
|
ctx->keylen = keylen;
|
|
}
|
|
|
|
ctx->flags |= FLAGS_NEW_KEY;
|
|
dev_dbg(dd->dev, "done\n");
|
|
return 0;
|
|
}
|
|
|
|
static void aes_workqueue_handler(struct work_struct *work)
|
|
{
|
|
struct tegra_aes_dev *dd = aes_dev;
|
|
int ret;
|
|
|
|
ret = clk_prepare_enable(dd->aes_clk);
|
|
if (ret)
|
|
BUG_ON("clock enable failed");
|
|
|
|
/* empty the crypto queue and then return */
|
|
do {
|
|
ret = tegra_aes_handle_req(dd);
|
|
} while (!ret);
|
|
|
|
clk_disable_unprepare(dd->aes_clk);
|
|
}
|
|
|
|
static irqreturn_t aes_irq(int irq, void *dev_id)
|
|
{
|
|
struct tegra_aes_dev *dd = (struct tegra_aes_dev *)dev_id;
|
|
u32 value = aes_readl(dd, TEGRA_AES_INTR_STATUS);
|
|
int busy = test_bit(FLAGS_BUSY, &dd->flags);
|
|
|
|
if (!busy) {
|
|
dev_dbg(dd->dev, "spurious interrupt\n");
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
dev_dbg(dd->dev, "irq_stat: 0x%x\n", value);
|
|
if (value & TEGRA_AES_INT_ERROR_MASK)
|
|
aes_writel(dd, TEGRA_AES_INT_ERROR_MASK, TEGRA_AES_INTR_STATUS);
|
|
|
|
if (!(value & TEGRA_AES_ENGINE_BUSY_FIELD))
|
|
complete(&dd->op_complete);
|
|
else
|
|
return IRQ_NONE;
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int tegra_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
|
|
{
|
|
struct tegra_aes_reqctx *rctx = ablkcipher_request_ctx(req);
|
|
struct tegra_aes_dev *dd = aes_dev;
|
|
unsigned long flags;
|
|
int err = 0;
|
|
int busy;
|
|
|
|
dev_dbg(dd->dev, "nbytes: %d, enc: %d, cbc: %d, ofb: %d\n",
|
|
req->nbytes, !!(mode & FLAGS_ENCRYPT),
|
|
!!(mode & FLAGS_CBC), !!(mode & FLAGS_OFB));
|
|
|
|
rctx->mode = mode;
|
|
|
|
spin_lock_irqsave(&dd->lock, flags);
|
|
err = ablkcipher_enqueue_request(&dd->queue, req);
|
|
busy = test_and_set_bit(FLAGS_BUSY, &dd->flags);
|
|
spin_unlock_irqrestore(&dd->lock, flags);
|
|
|
|
if (!busy)
|
|
queue_work(aes_wq, &aes_work);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int tegra_aes_ecb_encrypt(struct ablkcipher_request *req)
|
|
{
|
|
return tegra_aes_crypt(req, FLAGS_ENCRYPT);
|
|
}
|
|
|
|
static int tegra_aes_ecb_decrypt(struct ablkcipher_request *req)
|
|
{
|
|
return tegra_aes_crypt(req, 0);
|
|
}
|
|
|
|
static int tegra_aes_cbc_encrypt(struct ablkcipher_request *req)
|
|
{
|
|
return tegra_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
|
|
}
|
|
|
|
static int tegra_aes_cbc_decrypt(struct ablkcipher_request *req)
|
|
{
|
|
return tegra_aes_crypt(req, FLAGS_CBC);
|
|
}
|
|
|
|
static int tegra_aes_ofb_encrypt(struct ablkcipher_request *req)
|
|
{
|
|
return tegra_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_OFB);
|
|
}
|
|
|
|
static int tegra_aes_ofb_decrypt(struct ablkcipher_request *req)
|
|
{
|
|
return tegra_aes_crypt(req, FLAGS_OFB);
|
|
}
|
|
|
|
static int tegra_aes_get_random(struct crypto_rng *tfm, u8 *rdata,
|
|
unsigned int dlen)
|
|
{
|
|
struct tegra_aes_dev *dd = aes_dev;
|
|
struct tegra_aes_ctx *ctx = &rng_ctx;
|
|
int ret, i;
|
|
u8 *dest = rdata, *dt = dd->dt;
|
|
|
|
/* take mutex to access the aes hw */
|
|
mutex_lock(&aes_lock);
|
|
|
|
ret = clk_prepare_enable(dd->aes_clk);
|
|
if (ret) {
|
|
mutex_unlock(&aes_lock);
|
|
return ret;
|
|
}
|
|
|
|
ctx->dd = dd;
|
|
dd->ctx = ctx;
|
|
dd->flags = FLAGS_ENCRYPT | FLAGS_RNG;
|
|
|
|
memcpy(dd->buf_in, dt, DEFAULT_RNG_BLK_SZ);
|
|
|
|
ret = aes_start_crypt(dd, (u32)dd->dma_buf_in,
|
|
(u32)dd->dma_buf_out, 1, dd->flags, true);
|
|
if (ret < 0) {
|
|
dev_err(dd->dev, "aes_start_crypt fail(%d)\n", ret);
|
|
dlen = ret;
|
|
goto out;
|
|
}
|
|
memcpy(dest, dd->buf_out, dlen);
|
|
|
|
/* update the DT */
|
|
for (i = DEFAULT_RNG_BLK_SZ - 1; i >= 0; i--) {
|
|
dt[i] += 1;
|
|
if (dt[i] != 0)
|
|
break;
|
|
}
|
|
|
|
out:
|
|
clk_disable_unprepare(dd->aes_clk);
|
|
mutex_unlock(&aes_lock);
|
|
|
|
dev_dbg(dd->dev, "%s: done\n", __func__);
|
|
return dlen;
|
|
}
|
|
|
|
static int tegra_aes_rng_reset(struct crypto_rng *tfm, u8 *seed,
|
|
unsigned int slen)
|
|
{
|
|
struct tegra_aes_dev *dd = aes_dev;
|
|
struct tegra_aes_ctx *ctx = &rng_ctx;
|
|
struct tegra_aes_slot *key_slot;
|
|
struct timespec ts;
|
|
int ret = 0;
|
|
u64 nsec, tmp[2];
|
|
u8 *dt;
|
|
|
|
if (!ctx || !dd) {
|
|
dev_err(dd->dev, "ctx=0x%x, dd=0x%x\n",
|
|
(unsigned int)ctx, (unsigned int)dd);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (slen < (DEFAULT_RNG_BLK_SZ + AES_KEYSIZE_128)) {
|
|
dev_err(dd->dev, "seed size invalid");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* take mutex to access the aes hw */
|
|
mutex_lock(&aes_lock);
|
|
|
|
if (!ctx->slot) {
|
|
key_slot = aes_find_key_slot();
|
|
if (!key_slot) {
|
|
dev_err(dd->dev, "no empty slot\n");
|
|
mutex_unlock(&aes_lock);
|
|
return -ENOMEM;
|
|
}
|
|
ctx->slot = key_slot;
|
|
}
|
|
|
|
ctx->dd = dd;
|
|
dd->ctx = ctx;
|
|
dd->ctr = 0;
|
|
|
|
ctx->keylen = AES_KEYSIZE_128;
|
|
ctx->flags |= FLAGS_NEW_KEY;
|
|
|
|
/* copy the key to the key slot */
|
|
memcpy(dd->ivkey_base, seed + DEFAULT_RNG_BLK_SZ, AES_KEYSIZE_128);
|
|
memset(dd->ivkey_base + AES_KEYSIZE_128, 0, AES_HW_KEY_TABLE_LENGTH_BYTES - AES_KEYSIZE_128);
|
|
|
|
dd->iv = seed;
|
|
dd->ivlen = slen;
|
|
|
|
dd->flags = FLAGS_ENCRYPT | FLAGS_RNG;
|
|
|
|
ret = clk_prepare_enable(dd->aes_clk);
|
|
if (ret) {
|
|
mutex_unlock(&aes_lock);
|
|
return ret;
|
|
}
|
|
|
|
aes_set_key(dd);
|
|
|
|
/* set seed to the aes hw slot */
|
|
memcpy(dd->buf_in, dd->iv, DEFAULT_RNG_BLK_SZ);
|
|
ret = aes_start_crypt(dd, (u32)dd->dma_buf_in,
|
|
dd->dma_buf_out, 1, FLAGS_CBC, false);
|
|
if (ret < 0) {
|
|
dev_err(dd->dev, "aes_start_crypt fail(%d)\n", ret);
|
|
goto out;
|
|
}
|
|
|
|
if (dd->ivlen >= (2 * DEFAULT_RNG_BLK_SZ + AES_KEYSIZE_128)) {
|
|
dt = dd->iv + DEFAULT_RNG_BLK_SZ + AES_KEYSIZE_128;
|
|
} else {
|
|
getnstimeofday(&ts);
|
|
nsec = timespec_to_ns(&ts);
|
|
do_div(nsec, 1000);
|
|
nsec ^= dd->ctr << 56;
|
|
dd->ctr++;
|
|
tmp[0] = nsec;
|
|
tmp[1] = tegra_chip_uid();
|
|
dt = (u8 *)tmp;
|
|
}
|
|
memcpy(dd->dt, dt, DEFAULT_RNG_BLK_SZ);
|
|
|
|
out:
|
|
clk_disable_unprepare(dd->aes_clk);
|
|
mutex_unlock(&aes_lock);
|
|
|
|
dev_dbg(dd->dev, "%s: done\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
static int tegra_aes_cra_init(struct crypto_tfm *tfm)
|
|
{
|
|
tfm->crt_ablkcipher.reqsize = sizeof(struct tegra_aes_reqctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void tegra_aes_cra_exit(struct crypto_tfm *tfm)
|
|
{
|
|
struct tegra_aes_ctx *ctx =
|
|
crypto_ablkcipher_ctx((struct crypto_ablkcipher *)tfm);
|
|
|
|
if (ctx && ctx->slot)
|
|
aes_release_key_slot(ctx->slot);
|
|
}
|
|
|
|
static struct crypto_alg algs[] = {
|
|
{
|
|
.cra_name = "ecb(aes)",
|
|
.cra_driver_name = "ecb-aes-tegra",
|
|
.cra_priority = 300,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
|
.cra_alignmask = 3,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_u.ablkcipher = {
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
|
.setkey = tegra_aes_setkey,
|
|
.encrypt = tegra_aes_ecb_encrypt,
|
|
.decrypt = tegra_aes_ecb_decrypt,
|
|
},
|
|
}, {
|
|
.cra_name = "cbc(aes)",
|
|
.cra_driver_name = "cbc-aes-tegra",
|
|
.cra_priority = 300,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
|
.cra_alignmask = 3,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_u.ablkcipher = {
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
|
.ivsize = AES_MIN_KEY_SIZE,
|
|
.setkey = tegra_aes_setkey,
|
|
.encrypt = tegra_aes_cbc_encrypt,
|
|
.decrypt = tegra_aes_cbc_decrypt,
|
|
}
|
|
}, {
|
|
.cra_name = "ofb(aes)",
|
|
.cra_driver_name = "ofb-aes-tegra",
|
|
.cra_priority = 300,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
|
.cra_alignmask = 3,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_u.ablkcipher = {
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
|
.ivsize = AES_MIN_KEY_SIZE,
|
|
.setkey = tegra_aes_setkey,
|
|
.encrypt = tegra_aes_ofb_encrypt,
|
|
.decrypt = tegra_aes_ofb_decrypt,
|
|
}
|
|
}, {
|
|
.cra_name = "ansi_cprng",
|
|
.cra_driver_name = "rng-aes-tegra",
|
|
.cra_flags = CRYPTO_ALG_TYPE_RNG,
|
|
.cra_ctxsize = sizeof(struct tegra_aes_ctx),
|
|
.cra_type = &crypto_rng_type,
|
|
.cra_u.rng = {
|
|
.rng_make_random = tegra_aes_get_random,
|
|
.rng_reset = tegra_aes_rng_reset,
|
|
.seedsize = AES_KEYSIZE_128 + (2 * DEFAULT_RNG_BLK_SZ),
|
|
}
|
|
}
|
|
};
|
|
|
|
static int tegra_aes_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct tegra_aes_dev *dd;
|
|
struct resource *res;
|
|
int err = -ENOMEM, i = 0, j;
|
|
|
|
dd = devm_kzalloc(dev, sizeof(struct tegra_aes_dev), GFP_KERNEL);
|
|
if (dd == NULL) {
|
|
dev_err(dev, "unable to alloc data struct.\n");
|
|
return err;
|
|
}
|
|
|
|
dd->dev = dev;
|
|
platform_set_drvdata(pdev, dd);
|
|
|
|
dd->slots = devm_kzalloc(dev, sizeof(struct tegra_aes_slot) *
|
|
AES_NR_KEYSLOTS, GFP_KERNEL);
|
|
if (dd->slots == NULL) {
|
|
dev_err(dev, "unable to alloc slot struct.\n");
|
|
goto out;
|
|
}
|
|
|
|
spin_lock_init(&dd->lock);
|
|
crypto_init_queue(&dd->queue, TEGRA_AES_QUEUE_LENGTH);
|
|
|
|
/* Get the module base address */
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res) {
|
|
dev_err(dev, "invalid resource type: base\n");
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
if (!devm_request_mem_region(&pdev->dev, res->start,
|
|
resource_size(res),
|
|
dev_name(&pdev->dev))) {
|
|
dev_err(&pdev->dev, "Couldn't request MEM resource\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
dd->io_base = devm_ioremap(dev, res->start, resource_size(res));
|
|
if (!dd->io_base) {
|
|
dev_err(dev, "can't ioremap register space\n");
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* Initialize the vde clock */
|
|
dd->aes_clk = clk_get(dev, "vde");
|
|
if (IS_ERR(dd->aes_clk)) {
|
|
dev_err(dev, "iclock intialization failed.\n");
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
err = clk_set_rate(dd->aes_clk, ULONG_MAX);
|
|
if (err) {
|
|
dev_err(dd->dev, "iclk set_rate fail(%d)\n", err);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* the foll contiguous memory is allocated as follows -
|
|
* - hardware key table
|
|
* - key schedule
|
|
*/
|
|
dd->ivkey_base = dma_alloc_coherent(dev, AES_HW_KEY_TABLE_LENGTH_BYTES,
|
|
&dd->ivkey_phys_base,
|
|
GFP_KERNEL);
|
|
if (!dd->ivkey_base) {
|
|
dev_err(dev, "can not allocate iv/key buffer\n");
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
dd->buf_in = dma_alloc_coherent(dev, AES_HW_DMA_BUFFER_SIZE_BYTES,
|
|
&dd->dma_buf_in, GFP_KERNEL);
|
|
if (!dd->buf_in) {
|
|
dev_err(dev, "can not allocate dma-in buffer\n");
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
dd->buf_out = dma_alloc_coherent(dev, AES_HW_DMA_BUFFER_SIZE_BYTES,
|
|
&dd->dma_buf_out, GFP_KERNEL);
|
|
if (!dd->buf_out) {
|
|
dev_err(dev, "can not allocate dma-out buffer\n");
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
init_completion(&dd->op_complete);
|
|
aes_wq = alloc_workqueue("tegra_aes_wq", WQ_HIGHPRI | WQ_UNBOUND, 1);
|
|
if (!aes_wq) {
|
|
dev_err(dev, "alloc_workqueue failed\n");
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* get the irq */
|
|
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
|
if (!res) {
|
|
dev_err(dev, "invalid resource type: base\n");
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
dd->irq = res->start;
|
|
|
|
err = devm_request_irq(dev, dd->irq, aes_irq, IRQF_TRIGGER_HIGH |
|
|
IRQF_SHARED, "tegra-aes", dd);
|
|
if (err) {
|
|
dev_err(dev, "request_irq failed\n");
|
|
goto out;
|
|
}
|
|
|
|
mutex_init(&aes_lock);
|
|
INIT_LIST_HEAD(&dev_list);
|
|
|
|
spin_lock_init(&list_lock);
|
|
spin_lock(&list_lock);
|
|
for (i = 0; i < AES_NR_KEYSLOTS; i++) {
|
|
if (i == SSK_SLOT_NUM)
|
|
continue;
|
|
dd->slots[i].slot_num = i;
|
|
INIT_LIST_HEAD(&dd->slots[i].node);
|
|
list_add_tail(&dd->slots[i].node, &dev_list);
|
|
}
|
|
spin_unlock(&list_lock);
|
|
|
|
aes_dev = dd;
|
|
for (i = 0; i < ARRAY_SIZE(algs); i++) {
|
|
algs[i].cra_priority = 300;
|
|
algs[i].cra_ctxsize = sizeof(struct tegra_aes_ctx);
|
|
algs[i].cra_module = THIS_MODULE;
|
|
algs[i].cra_init = tegra_aes_cra_init;
|
|
algs[i].cra_exit = tegra_aes_cra_exit;
|
|
|
|
err = crypto_register_alg(&algs[i]);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
dev_info(dev, "registered");
|
|
return 0;
|
|
|
|
out:
|
|
for (j = 0; j < i; j++)
|
|
crypto_unregister_alg(&algs[j]);
|
|
if (dd->ivkey_base)
|
|
dma_free_coherent(dev, AES_HW_KEY_TABLE_LENGTH_BYTES,
|
|
dd->ivkey_base, dd->ivkey_phys_base);
|
|
if (dd->buf_in)
|
|
dma_free_coherent(dev, AES_HW_DMA_BUFFER_SIZE_BYTES,
|
|
dd->buf_in, dd->dma_buf_in);
|
|
if (dd->buf_out)
|
|
dma_free_coherent(dev, AES_HW_DMA_BUFFER_SIZE_BYTES,
|
|
dd->buf_out, dd->dma_buf_out);
|
|
if (!IS_ERR(dd->aes_clk))
|
|
clk_put(dd->aes_clk);
|
|
if (aes_wq)
|
|
destroy_workqueue(aes_wq);
|
|
spin_lock(&list_lock);
|
|
list_del(&dev_list);
|
|
spin_unlock(&list_lock);
|
|
|
|
aes_dev = NULL;
|
|
|
|
dev_err(dev, "%s: initialization failed.\n", __func__);
|
|
return err;
|
|
}
|
|
|
|
static int tegra_aes_remove(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct tegra_aes_dev *dd = platform_get_drvdata(pdev);
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(algs); i++)
|
|
crypto_unregister_alg(&algs[i]);
|
|
|
|
cancel_work_sync(&aes_work);
|
|
destroy_workqueue(aes_wq);
|
|
spin_lock(&list_lock);
|
|
list_del(&dev_list);
|
|
spin_unlock(&list_lock);
|
|
|
|
dma_free_coherent(dev, AES_HW_KEY_TABLE_LENGTH_BYTES,
|
|
dd->ivkey_base, dd->ivkey_phys_base);
|
|
dma_free_coherent(dev, AES_HW_DMA_BUFFER_SIZE_BYTES,
|
|
dd->buf_in, dd->dma_buf_in);
|
|
dma_free_coherent(dev, AES_HW_DMA_BUFFER_SIZE_BYTES,
|
|
dd->buf_out, dd->dma_buf_out);
|
|
clk_put(dd->aes_clk);
|
|
aes_dev = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id tegra_aes_of_match[] = {
|
|
{ .compatible = "nvidia,tegra20-aes", },
|
|
{ .compatible = "nvidia,tegra30-aes", },
|
|
{ },
|
|
};
|
|
|
|
static struct platform_driver tegra_aes_driver = {
|
|
.probe = tegra_aes_probe,
|
|
.remove = tegra_aes_remove,
|
|
.driver = {
|
|
.name = "tegra-aes",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = tegra_aes_of_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(tegra_aes_driver);
|
|
|
|
MODULE_DESCRIPTION("Tegra AES/OFB/CPRNG hw acceleration support.");
|
|
MODULE_AUTHOR("NVIDIA Corporation");
|
|
MODULE_LICENSE("GPL v2");
|