+++ /dev/null
-/*
- * drivers/crypto/tegra-aes.c
- *
- * Driver for NVIDIA Tegra AES hardware engine residing inside the
- * Bit Stream Engine for Video (BSEV) hardware block.
- *
- * The programming sequence for this engine is with the help
- * of commands which travel via a command queue residing between the
- * CPU and the BSEV block. The BSEV engine has an internal RAM (VRAM)
- * where the final input plaintext, keys and the IV have to be copied
- * before starting the encrypt/decrypt operation.
- *
- * Copyright (c) 2010, NVIDIA Corporation.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/clk.h>
-#include <linux/platform_device.h>
-#include <linux/scatterlist.h>
-#include <linux/dma-mapping.h>
-#include <linux/io.h>
-#include <linux/mutex.h>
-#include <linux/interrupt.h>
-#include <linux/completion.h>
-#include <linux/workqueue.h>
-
-#include <crypto/scatterwalk.h>
-#include <crypto/aes.h>
-#include <crypto/internal/rng.h>
-
-#include "tegra-aes.h"
-
-#define FLAGS_MODE_MASK 0x00FF
-#define FLAGS_ENCRYPT BIT(0)
-#define FLAGS_CBC BIT(1)
-#define FLAGS_GIV BIT(2)
-#define FLAGS_RNG BIT(3)
-#define FLAGS_OFB BIT(4)
-#define FLAGS_NEW_KEY BIT(5)
-#define FLAGS_NEW_IV BIT(6)
-#define FLAGS_INIT BIT(7)
-#define FLAGS_FAST BIT(8)
-#define FLAGS_BUSY 9
-
-/*
- * Defines AES engine Max process bytes size in one go, which takes 1 msec.
- * AES engine spends about 176 cycles/16-bytes or 11 cycles/byte
- * The duration CPU can use the BSE to 1 msec, then the number of available
- * cycles of AVP/BSE is 216K. In this duration, AES can process 216/11 ~= 19KB
- * Based on this AES_HW_DMA_BUFFER_SIZE_BYTES is configured to 16KB.
- */
-#define AES_HW_DMA_BUFFER_SIZE_BYTES 0x4000
-
-/*
- * The key table length is 64 bytes
- * (This includes first upto 32 bytes key + 16 bytes original initial vector
- * and 16 bytes updated initial vector)
- */
-#define AES_HW_KEY_TABLE_LENGTH_BYTES 64
-
-/*
- * The memory being used is divides as follows:
- * 1. Key - 32 bytes
- * 2. Original IV - 16 bytes
- * 3. Updated IV - 16 bytes
- * 4. Key schedule - 256 bytes
- *
- * 1+2+3 constitute the hw key table.
- */
-#define AES_HW_IV_SIZE 16
-#define AES_HW_KEYSCHEDULE_LEN 256
-#define AES_IVKEY_SIZE (AES_HW_KEY_TABLE_LENGTH_BYTES + AES_HW_KEYSCHEDULE_LEN)
-
-/* Define commands required for AES operation */
-enum {
- CMD_BLKSTARTENGINE = 0x0E,
- CMD_DMASETUP = 0x10,
- CMD_DMACOMPLETE = 0x11,
- CMD_SETTABLE = 0x15,
- CMD_MEMDMAVD = 0x22,
-};
-
-/* Define sub-commands */
-enum {
- SUBCMD_VRAM_SEL = 0x1,
- SUBCMD_CRYPTO_TABLE_SEL = 0x3,
- SUBCMD_KEY_TABLE_SEL = 0x8,
-};
-
-/* memdma_vd command */
-#define MEMDMA_DIR_DTOVRAM 0 /* sdram -> vram */
-#define MEMDMA_DIR_VTODRAM 1 /* vram -> sdram */
-#define MEMDMA_DIR_SHIFT 25
-#define MEMDMA_NUM_WORDS_SHIFT 12
-
-/* command queue bit shifts */
-enum {
- CMDQ_KEYTABLEADDR_SHIFT = 0,
- CMDQ_KEYTABLEID_SHIFT = 17,
- CMDQ_VRAMSEL_SHIFT = 23,
- CMDQ_TABLESEL_SHIFT = 24,
- CMDQ_OPCODE_SHIFT = 26,
-};
-
-/*
- * The secure key slot contains a unique secure key generated
- * and loaded by the bootloader. This slot is marked as non-accessible
- * to the kernel.
- */
-#define SSK_SLOT_NUM 4
-
-#define AES_NR_KEYSLOTS 8
-#define TEGRA_AES_QUEUE_LENGTH 50
-#define DEFAULT_RNG_BLK_SZ 16
-
-/* The command queue depth */
-#define AES_HW_MAX_ICQ_LENGTH 5
-
-struct tegra_aes_slot {
- struct list_head node;
- int slot_num;
-};
-
-static struct tegra_aes_slot ssk = {
- .slot_num = SSK_SLOT_NUM,
-};
-
-struct tegra_aes_reqctx {
- unsigned long mode;
-};
-
-struct tegra_aes_dev {
- struct device *dev;
- void __iomem *io_base;
- dma_addr_t ivkey_phys_base;
- void __iomem *ivkey_base;
- struct clk *aes_clk;
- struct tegra_aes_ctx *ctx;
- int irq;
- unsigned long flags;
- struct completion op_complete;
- u32 *buf_in;
- dma_addr_t dma_buf_in;
- u32 *buf_out;
- dma_addr_t dma_buf_out;
- u8 *iv;
- u8 dt[DEFAULT_RNG_BLK_SZ];
- int ivlen;
- u64 ctr;
- spinlock_t lock;
- struct crypto_queue queue;
- struct tegra_aes_slot *slots;
- struct ablkcipher_request *req;
- size_t total;
- struct scatterlist *in_sg;
- size_t in_offset;
- struct scatterlist *out_sg;
- size_t out_offset;
-};
-
-static struct tegra_aes_dev *aes_dev;
-
-struct tegra_aes_ctx {
- struct tegra_aes_dev *dd;
- unsigned long flags;
- struct tegra_aes_slot *slot;
- u8 key[AES_MAX_KEY_SIZE];
- size_t keylen;
-};
-
-static struct tegra_aes_ctx rng_ctx = {
- .flags = FLAGS_NEW_KEY,
- .keylen = AES_KEYSIZE_128,
-};
-
-/* keep registered devices data here */
-static struct list_head dev_list;
-static DEFINE_SPINLOCK(list_lock);
-static DEFINE_MUTEX(aes_lock);
-
-static void aes_workqueue_handler(struct work_struct *work);
-static DECLARE_WORK(aes_work, aes_workqueue_handler);
-static struct workqueue_struct *aes_wq;
-
-static inline u32 aes_readl(struct tegra_aes_dev *dd, u32 offset)
-{
- return readl(dd->io_base + offset);
-}
-
-static inline void aes_writel(struct tegra_aes_dev *dd, u32 val, u32 offset)
-{
- writel(val, dd->io_base + offset);
-}
-
-static int aes_start_crypt(struct tegra_aes_dev *dd, u32 in_addr, u32 out_addr,
- int nblocks, int mode, bool upd_iv)
-{
- u32 cmdq[AES_HW_MAX_ICQ_LENGTH];
- int i, eng_busy, icq_empty, ret;
- u32 value;
-
- /* reset all the interrupt bits */
- aes_writel(dd, 0xFFFFFFFF, TEGRA_AES_INTR_STATUS);
-
- /* enable error, dma xfer complete interrupts */
- aes_writel(dd, 0x33, TEGRA_AES_INT_ENB);
-
- cmdq[0] = CMD_DMASETUP << CMDQ_OPCODE_SHIFT;
- cmdq[1] = in_addr;
- cmdq[2] = CMD_BLKSTARTENGINE << CMDQ_OPCODE_SHIFT | (nblocks-1);
- cmdq[3] = CMD_DMACOMPLETE << CMDQ_OPCODE_SHIFT;
-
- value = aes_readl(dd, TEGRA_AES_CMDQUE_CONTROL);
- /* access SDRAM through AHB */
- value &= ~TEGRA_AES_CMDQ_CTRL_SRC_STM_SEL_FIELD;
- value &= ~TEGRA_AES_CMDQ_CTRL_DST_STM_SEL_FIELD;
- value |= TEGRA_AES_CMDQ_CTRL_SRC_STM_SEL_FIELD |
- TEGRA_AES_CMDQ_CTRL_DST_STM_SEL_FIELD |
- TEGRA_AES_CMDQ_CTRL_ICMDQEN_FIELD;
- aes_writel(dd, value, TEGRA_AES_CMDQUE_CONTROL);
- dev_dbg(dd->dev, "cmd_q_ctrl=0x%x", value);
-
- value = (0x1 << TEGRA_AES_SECURE_INPUT_ALG_SEL_SHIFT) |
- ((dd->ctx->keylen * 8) <<
- TEGRA_AES_SECURE_INPUT_KEY_LEN_SHIFT) |
- ((u32)upd_iv << TEGRA_AES_SECURE_IV_SELECT_SHIFT);
-
- if (mode & FLAGS_CBC) {
- value |= ((((mode & FLAGS_ENCRYPT) ? 2 : 3)
- << TEGRA_AES_SECURE_XOR_POS_SHIFT) |
- (((mode & FLAGS_ENCRYPT) ? 2 : 3)
- << TEGRA_AES_SECURE_VCTRAM_SEL_SHIFT) |
- ((mode & FLAGS_ENCRYPT) ? 1 : 0)
- << TEGRA_AES_SECURE_CORE_SEL_SHIFT);
- } else if (mode & FLAGS_OFB) {
- value |= ((TEGRA_AES_SECURE_XOR_POS_FIELD) |
- (2 << TEGRA_AES_SECURE_INPUT_SEL_SHIFT) |
- (TEGRA_AES_SECURE_CORE_SEL_FIELD));
- } else if (mode & FLAGS_RNG) {
- value |= (((mode & FLAGS_ENCRYPT) ? 1 : 0)
- << TEGRA_AES_SECURE_CORE_SEL_SHIFT |
- TEGRA_AES_SECURE_RNG_ENB_FIELD);
- } else {
- value |= (((mode & FLAGS_ENCRYPT) ? 1 : 0)
- << TEGRA_AES_SECURE_CORE_SEL_SHIFT);
- }
-
- dev_dbg(dd->dev, "secure_in_sel=0x%x", value);
- aes_writel(dd, value, TEGRA_AES_SECURE_INPUT_SELECT);
-
- aes_writel(dd, out_addr, TEGRA_AES_SECURE_DEST_ADDR);
- reinit_completion(&dd->op_complete);
-
- for (i = 0; i < AES_HW_MAX_ICQ_LENGTH - 1; i++) {
- do {
- value = aes_readl(dd, TEGRA_AES_INTR_STATUS);
- eng_busy = value & TEGRA_AES_ENGINE_BUSY_FIELD;
- icq_empty = value & TEGRA_AES_ICQ_EMPTY_FIELD;
- } while (eng_busy && !icq_empty);
- aes_writel(dd, cmdq[i], TEGRA_AES_ICMDQUE_WR);
- }
-
- ret = wait_for_completion_timeout(&dd->op_complete,
- msecs_to_jiffies(150));
- if (ret == 0) {
- dev_err(dd->dev, "timed out (0x%x)\n",
- aes_readl(dd, TEGRA_AES_INTR_STATUS));
- return -ETIMEDOUT;
- }
-
- aes_writel(dd, cmdq[AES_HW_MAX_ICQ_LENGTH - 1], TEGRA_AES_ICMDQUE_WR);
- return 0;
-}
-
-static void aes_release_key_slot(struct tegra_aes_slot *slot)
-{
- if (slot->slot_num == SSK_SLOT_NUM)
- return;
-
- spin_lock(&list_lock);
- list_add_tail(&slot->node, &dev_list);
- slot = NULL;
- spin_unlock(&list_lock);
-}
-
-static struct tegra_aes_slot *aes_find_key_slot(void)
-{
- struct tegra_aes_slot *slot = NULL;
- struct list_head *new_head;
- int empty;
-
- spin_lock(&list_lock);
- empty = list_empty(&dev_list);
- if (!empty) {
- slot = list_entry(&dev_list, struct tegra_aes_slot, node);
- new_head = dev_list.next;
- list_del(&dev_list);
- dev_list.next = new_head->next;
- dev_list.prev = NULL;
- }
- spin_unlock(&list_lock);
-
- return slot;
-}
-
-static int aes_set_key(struct tegra_aes_dev *dd)
-{
- u32 value, cmdq[2];
- struct tegra_aes_ctx *ctx = dd->ctx;
- int eng_busy, icq_empty, dma_busy;
- bool use_ssk = false;
-
- /* use ssk? */
- if (!dd->ctx->slot) {
- dev_dbg(dd->dev, "using ssk");
- dd->ctx->slot = &ssk;
- use_ssk = true;
- }
-
- /* enable key schedule generation in hardware */
- value = aes_readl(dd, TEGRA_AES_SECURE_CONFIG_EXT);
- value &= ~TEGRA_AES_SECURE_KEY_SCH_DIS_FIELD;
- aes_writel(dd, value, TEGRA_AES_SECURE_CONFIG_EXT);
-
- /* select the key slot */
- value = aes_readl(dd, TEGRA_AES_SECURE_CONFIG);
- value &= ~TEGRA_AES_SECURE_KEY_INDEX_FIELD;
- value |= (ctx->slot->slot_num << TEGRA_AES_SECURE_KEY_INDEX_SHIFT);
- aes_writel(dd, value, TEGRA_AES_SECURE_CONFIG);
-
- if (use_ssk)
- return 0;
-
- /* copy the key table from sdram to vram */
- cmdq[0] = CMD_MEMDMAVD << CMDQ_OPCODE_SHIFT |
- MEMDMA_DIR_DTOVRAM << MEMDMA_DIR_SHIFT |
- AES_HW_KEY_TABLE_LENGTH_BYTES / sizeof(u32) <<
- MEMDMA_NUM_WORDS_SHIFT;
- cmdq[1] = (u32)dd->ivkey_phys_base;
-
- aes_writel(dd, cmdq[0], TEGRA_AES_ICMDQUE_WR);
- aes_writel(dd, cmdq[1], TEGRA_AES_ICMDQUE_WR);
-
- do {
- value = aes_readl(dd, TEGRA_AES_INTR_STATUS);
- eng_busy = value & TEGRA_AES_ENGINE_BUSY_FIELD;
- icq_empty = value & TEGRA_AES_ICQ_EMPTY_FIELD;
- dma_busy = value & TEGRA_AES_DMA_BUSY_FIELD;
- } while (eng_busy && !icq_empty && dma_busy);
-
- /* settable command to get key into internal registers */
- value = CMD_SETTABLE << CMDQ_OPCODE_SHIFT |
- SUBCMD_CRYPTO_TABLE_SEL << CMDQ_TABLESEL_SHIFT |
- SUBCMD_VRAM_SEL << CMDQ_VRAMSEL_SHIFT |
- (SUBCMD_KEY_TABLE_SEL | ctx->slot->slot_num) <<
- CMDQ_KEYTABLEID_SHIFT;
- aes_writel(dd, value, TEGRA_AES_ICMDQUE_WR);
-
- do {
- value = aes_readl(dd, TEGRA_AES_INTR_STATUS);
- eng_busy = value & TEGRA_AES_ENGINE_BUSY_FIELD;
- icq_empty = value & TEGRA_AES_ICQ_EMPTY_FIELD;
- } while (eng_busy && !icq_empty);
-
- return 0;
-}
-
-static int tegra_aes_handle_req(struct tegra_aes_dev *dd)
-{
- struct crypto_async_request *async_req, *backlog;
- struct crypto_ablkcipher *tfm;
- struct tegra_aes_ctx *ctx;
- struct tegra_aes_reqctx *rctx;
- struct ablkcipher_request *req;
- unsigned long flags;
- int dma_max = AES_HW_DMA_BUFFER_SIZE_BYTES;
- int ret = 0, nblocks, total;
- int count = 0;
- dma_addr_t addr_in, addr_out;
- struct scatterlist *in_sg, *out_sg;
-
- if (!dd)
- return -EINVAL;
-
- spin_lock_irqsave(&dd->lock, flags);
- backlog = crypto_get_backlog(&dd->queue);
- async_req = crypto_dequeue_request(&dd->queue);
- if (!async_req)
- clear_bit(FLAGS_BUSY, &dd->flags);
- spin_unlock_irqrestore(&dd->lock, flags);
-
- if (!async_req)
- return -ENODATA;
-
- if (backlog)
- backlog->complete(backlog, -EINPROGRESS);
-
- req = ablkcipher_request_cast(async_req);
-
- dev_dbg(dd->dev, "%s: get new req\n", __func__);
-
- if (!req->src || !req->dst)
- return -EINVAL;
-
- /* take mutex to access the aes hw */
- mutex_lock(&aes_lock);
-
- /* assign new request to device */
- dd->req = req;
- dd->total = req->nbytes;
- dd->in_offset = 0;
- dd->in_sg = req->src;
- dd->out_offset = 0;
- dd->out_sg = req->dst;
-
- in_sg = dd->in_sg;
- out_sg = dd->out_sg;
-
- total = dd->total;
-
- tfm = crypto_ablkcipher_reqtfm(req);
- rctx = ablkcipher_request_ctx(req);
- ctx = crypto_ablkcipher_ctx(tfm);
- rctx->mode &= FLAGS_MODE_MASK;
- dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
-
- dd->iv = (u8 *)req->info;
- dd->ivlen = crypto_ablkcipher_ivsize(tfm);
-
- /* assign new context to device */
- ctx->dd = dd;
- dd->ctx = ctx;
-
- if (ctx->flags & FLAGS_NEW_KEY) {
- /* 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;
- int ret = 0;
- u8 tmp[16]; /* 16 bytes = 128 bits of entropy */
- u8 *dt;
-
- if (!ctx || !dd) {
- pr_err("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 {
- get_random_bytes(tmp, sizeof(tmp));
- dt = 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;
-}
-
-static 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 = devm_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 (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);
- 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");
projects / platform / kernel / linux-rpi.git / commitdiff