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sahara.c
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sahara.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Cryptographic API.
*
* Support for SAHARA cryptographic accelerator.
*
* Copyright (c) 2014 Steffen Trumtrar <[email protected]>
* Copyright (c) 2013 Vista Silicon S.L.
* Author: Javier Martin <[email protected]>
*
* Based on omap-aes.c and tegra-aes.c
*/
#include <crypto/aes.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/skcipher.h>
#include <crypto/scatterwalk.h>
#include <crypto/sha.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#define SHA_BUFFER_LEN PAGE_SIZE
#define SAHARA_MAX_SHA_BLOCK_SIZE SHA256_BLOCK_SIZE
#define SAHARA_NAME "sahara"
#define SAHARA_VERSION_3 3
#define SAHARA_VERSION_4 4
#define SAHARA_TIMEOUT_MS 1000
#define SAHARA_MAX_HW_DESC 2
#define SAHARA_MAX_HW_LINK 20
#define FLAGS_MODE_MASK 0x000f
#define FLAGS_ENCRYPT BIT(0)
#define FLAGS_CBC BIT(1)
#define FLAGS_NEW_KEY BIT(3)
#define SAHARA_HDR_BASE 0x00800000
#define SAHARA_HDR_SKHA_ALG_AES 0
#define SAHARA_HDR_SKHA_OP_ENC (1 << 2)
#define SAHARA_HDR_SKHA_MODE_ECB (0 << 3)
#define SAHARA_HDR_SKHA_MODE_CBC (1 << 3)
#define SAHARA_HDR_FORM_DATA (5 << 16)
#define SAHARA_HDR_FORM_KEY (8 << 16)
#define SAHARA_HDR_LLO (1 << 24)
#define SAHARA_HDR_CHA_SKHA (1 << 28)
#define SAHARA_HDR_CHA_MDHA (2 << 28)
#define SAHARA_HDR_PARITY_BIT (1 << 31)
#define SAHARA_HDR_MDHA_SET_MODE_MD_KEY 0x20880000
#define SAHARA_HDR_MDHA_SET_MODE_HASH 0x208D0000
#define SAHARA_HDR_MDHA_HASH 0xA0850000
#define SAHARA_HDR_MDHA_STORE_DIGEST 0x20820000
#define SAHARA_HDR_MDHA_ALG_SHA1 0
#define SAHARA_HDR_MDHA_ALG_MD5 1
#define SAHARA_HDR_MDHA_ALG_SHA256 2
#define SAHARA_HDR_MDHA_ALG_SHA224 3
#define SAHARA_HDR_MDHA_PDATA (1 << 2)
#define SAHARA_HDR_MDHA_HMAC (1 << 3)
#define SAHARA_HDR_MDHA_INIT (1 << 5)
#define SAHARA_HDR_MDHA_IPAD (1 << 6)
#define SAHARA_HDR_MDHA_OPAD (1 << 7)
#define SAHARA_HDR_MDHA_SWAP (1 << 8)
#define SAHARA_HDR_MDHA_MAC_FULL (1 << 9)
#define SAHARA_HDR_MDHA_SSL (1 << 10)
/* SAHARA can only process one request at a time */
#define SAHARA_QUEUE_LENGTH 1
#define SAHARA_REG_VERSION 0x00
#define SAHARA_REG_DAR 0x04
#define SAHARA_REG_CONTROL 0x08
#define SAHARA_CONTROL_SET_THROTTLE(x) (((x) & 0xff) << 24)
#define SAHARA_CONTROL_SET_MAXBURST(x) (((x) & 0xff) << 16)
#define SAHARA_CONTROL_RNG_AUTORSD (1 << 7)
#define SAHARA_CONTROL_ENABLE_INT (1 << 4)
#define SAHARA_REG_CMD 0x0C
#define SAHARA_CMD_RESET (1 << 0)
#define SAHARA_CMD_CLEAR_INT (1 << 8)
#define SAHARA_CMD_CLEAR_ERR (1 << 9)
#define SAHARA_CMD_SINGLE_STEP (1 << 10)
#define SAHARA_CMD_MODE_BATCH (1 << 16)
#define SAHARA_CMD_MODE_DEBUG (1 << 18)
#define SAHARA_REG_STATUS 0x10
#define SAHARA_STATUS_GET_STATE(x) ((x) & 0x7)
#define SAHARA_STATE_IDLE 0
#define SAHARA_STATE_BUSY 1
#define SAHARA_STATE_ERR 2
#define SAHARA_STATE_FAULT 3
#define SAHARA_STATE_COMPLETE 4
#define SAHARA_STATE_COMP_FLAG (1 << 2)
#define SAHARA_STATUS_DAR_FULL (1 << 3)
#define SAHARA_STATUS_ERROR (1 << 4)
#define SAHARA_STATUS_SECURE (1 << 5)
#define SAHARA_STATUS_FAIL (1 << 6)
#define SAHARA_STATUS_INIT (1 << 7)
#define SAHARA_STATUS_RNG_RESEED (1 << 8)
#define SAHARA_STATUS_ACTIVE_RNG (1 << 9)
#define SAHARA_STATUS_ACTIVE_MDHA (1 << 10)
#define SAHARA_STATUS_ACTIVE_SKHA (1 << 11)
#define SAHARA_STATUS_MODE_BATCH (1 << 16)
#define SAHARA_STATUS_MODE_DEDICATED (1 << 17)
#define SAHARA_STATUS_MODE_DEBUG (1 << 18)
#define SAHARA_STATUS_GET_ISTATE(x) (((x) >> 24) & 0xff)
#define SAHARA_REG_ERRSTATUS 0x14
#define SAHARA_ERRSTATUS_GET_SOURCE(x) ((x) & 0xf)
#define SAHARA_ERRSOURCE_CHA 14
#define SAHARA_ERRSOURCE_DMA 15
#define SAHARA_ERRSTATUS_DMA_DIR (1 << 8)
#define SAHARA_ERRSTATUS_GET_DMASZ(x)(((x) >> 9) & 0x3)
#define SAHARA_ERRSTATUS_GET_DMASRC(x) (((x) >> 13) & 0x7)
#define SAHARA_ERRSTATUS_GET_CHASRC(x) (((x) >> 16) & 0xfff)
#define SAHARA_ERRSTATUS_GET_CHAERR(x) (((x) >> 28) & 0x3)
#define SAHARA_REG_FADDR 0x18
#define SAHARA_REG_CDAR 0x1C
#define SAHARA_REG_IDAR 0x20
struct sahara_hw_desc {
u32 hdr;
u32 len1;
u32 p1;
u32 len2;
u32 p2;
u32 next;
};
struct sahara_hw_link {
u32 len;
u32 p;
u32 next;
};
struct sahara_ctx {
unsigned long flags;
/* AES-specific context */
int keylen;
u8 key[AES_KEYSIZE_128];
struct crypto_skcipher *fallback;
};
struct sahara_aes_reqctx {
unsigned long mode;
struct skcipher_request fallback_req; // keep at the end
};
/*
* struct sahara_sha_reqctx - private data per request
* @buf: holds data for requests smaller than block_size
* @rembuf: used to prepare one block_size-aligned request
* @context: hw-specific context for request. Digest is extracted from this
* @mode: specifies what type of hw-descriptor needs to be built
* @digest_size: length of digest for this request
* @context_size: length of hw-context for this request.
* Always digest_size + 4
* @buf_cnt: number of bytes saved in buf
* @sg_in_idx: number of hw links
* @in_sg: scatterlist for input data
* @in_sg_chain: scatterlists for chained input data
* @total: total number of bytes for transfer
* @last: is this the last block
* @first: is this the first block
* @active: inside a transfer
*/
struct sahara_sha_reqctx {
u8 buf[SAHARA_MAX_SHA_BLOCK_SIZE];
u8 rembuf[SAHARA_MAX_SHA_BLOCK_SIZE];
u8 context[SHA256_DIGEST_SIZE + 4];
unsigned int mode;
unsigned int digest_size;
unsigned int context_size;
unsigned int buf_cnt;
unsigned int sg_in_idx;
struct scatterlist *in_sg;
struct scatterlist in_sg_chain[2];
size_t total;
unsigned int last;
unsigned int first;
unsigned int active;
};
struct sahara_dev {
struct device *device;
unsigned int version;
void __iomem *regs_base;
struct clk *clk_ipg;
struct clk *clk_ahb;
struct mutex queue_mutex;
struct task_struct *kthread;
struct completion dma_completion;
struct sahara_ctx *ctx;
struct crypto_queue queue;
unsigned long flags;
struct sahara_hw_desc *hw_desc[SAHARA_MAX_HW_DESC];
dma_addr_t hw_phys_desc[SAHARA_MAX_HW_DESC];
u8 *key_base;
dma_addr_t key_phys_base;
u8 *iv_base;
dma_addr_t iv_phys_base;
u8 *context_base;
dma_addr_t context_phys_base;
struct sahara_hw_link *hw_link[SAHARA_MAX_HW_LINK];
dma_addr_t hw_phys_link[SAHARA_MAX_HW_LINK];
size_t total;
struct scatterlist *in_sg;
int nb_in_sg;
struct scatterlist *out_sg;
int nb_out_sg;
u32 error;
};
static struct sahara_dev *dev_ptr;
static inline void sahara_write(struct sahara_dev *dev, u32 data, u32 reg)
{
writel(data, dev->regs_base + reg);
}
static inline unsigned int sahara_read(struct sahara_dev *dev, u32 reg)
{
return readl(dev->regs_base + reg);
}
static u32 sahara_aes_key_hdr(struct sahara_dev *dev)
{
u32 hdr = SAHARA_HDR_BASE | SAHARA_HDR_SKHA_ALG_AES |
SAHARA_HDR_FORM_KEY | SAHARA_HDR_LLO |
SAHARA_HDR_CHA_SKHA | SAHARA_HDR_PARITY_BIT;
if (dev->flags & FLAGS_CBC) {
hdr |= SAHARA_HDR_SKHA_MODE_CBC;
hdr ^= SAHARA_HDR_PARITY_BIT;
}
if (dev->flags & FLAGS_ENCRYPT) {
hdr |= SAHARA_HDR_SKHA_OP_ENC;
hdr ^= SAHARA_HDR_PARITY_BIT;
}
return hdr;
}
static u32 sahara_aes_data_link_hdr(struct sahara_dev *dev)
{
return SAHARA_HDR_BASE | SAHARA_HDR_FORM_DATA |
SAHARA_HDR_CHA_SKHA | SAHARA_HDR_PARITY_BIT;
}
static const char *sahara_err_src[16] = {
"No error",
"Header error",
"Descriptor length error",
"Descriptor length or pointer error",
"Link length error",
"Link pointer error",
"Input buffer error",
"Output buffer error",
"Output buffer starvation",
"Internal state fault",
"General descriptor problem",
"Reserved",
"Descriptor address error",
"Link address error",
"CHA error",
"DMA error"
};
static const char *sahara_err_dmasize[4] = {
"Byte transfer",
"Half-word transfer",
"Word transfer",
"Reserved"
};
static const char *sahara_err_dmasrc[8] = {
"No error",
"AHB bus error",
"Internal IP bus error",
"Parity error",
"DMA crosses 256 byte boundary",
"DMA is busy",
"Reserved",
"DMA HW error"
};
static const char *sahara_cha_errsrc[12] = {
"Input buffer non-empty",
"Illegal address",
"Illegal mode",
"Illegal data size",
"Illegal key size",
"Write during processing",
"CTX read during processing",
"HW error",
"Input buffer disabled/underflow",
"Output buffer disabled/overflow",
"DES key parity error",
"Reserved"
};
static const char *sahara_cha_err[4] = { "No error", "SKHA", "MDHA", "RNG" };
static void sahara_decode_error(struct sahara_dev *dev, unsigned int error)
{
u8 source = SAHARA_ERRSTATUS_GET_SOURCE(error);
u16 chasrc = ffs(SAHARA_ERRSTATUS_GET_CHASRC(error));
dev_err(dev->device, "%s: Error Register = 0x%08x\n", __func__, error);
dev_err(dev->device, " - %s.\n", sahara_err_src[source]);
if (source == SAHARA_ERRSOURCE_DMA) {
if (error & SAHARA_ERRSTATUS_DMA_DIR)
dev_err(dev->device, " * DMA read.\n");
else
dev_err(dev->device, " * DMA write.\n");
dev_err(dev->device, " * %s.\n",
sahara_err_dmasize[SAHARA_ERRSTATUS_GET_DMASZ(error)]);
dev_err(dev->device, " * %s.\n",
sahara_err_dmasrc[SAHARA_ERRSTATUS_GET_DMASRC(error)]);
} else if (source == SAHARA_ERRSOURCE_CHA) {
dev_err(dev->device, " * %s.\n",
sahara_cha_errsrc[chasrc]);
dev_err(dev->device, " * %s.\n",
sahara_cha_err[SAHARA_ERRSTATUS_GET_CHAERR(error)]);
}
dev_err(dev->device, "\n");
}
static const char *sahara_state[4] = { "Idle", "Busy", "Error", "HW Fault" };
static void sahara_decode_status(struct sahara_dev *dev, unsigned int status)
{
u8 state;
if (!__is_defined(DEBUG))
return;
state = SAHARA_STATUS_GET_STATE(status);
dev_dbg(dev->device, "%s: Status Register = 0x%08x\n",
__func__, status);
dev_dbg(dev->device, " - State = %d:\n", state);
if (state & SAHARA_STATE_COMP_FLAG)
dev_dbg(dev->device, " * Descriptor completed. IRQ pending.\n");
dev_dbg(dev->device, " * %s.\n",
sahara_state[state & ~SAHARA_STATE_COMP_FLAG]);
if (status & SAHARA_STATUS_DAR_FULL)
dev_dbg(dev->device, " - DAR Full.\n");
if (status & SAHARA_STATUS_ERROR)
dev_dbg(dev->device, " - Error.\n");
if (status & SAHARA_STATUS_SECURE)
dev_dbg(dev->device, " - Secure.\n");
if (status & SAHARA_STATUS_FAIL)
dev_dbg(dev->device, " - Fail.\n");
if (status & SAHARA_STATUS_RNG_RESEED)
dev_dbg(dev->device, " - RNG Reseed Request.\n");
if (status & SAHARA_STATUS_ACTIVE_RNG)
dev_dbg(dev->device, " - RNG Active.\n");
if (status & SAHARA_STATUS_ACTIVE_MDHA)
dev_dbg(dev->device, " - MDHA Active.\n");
if (status & SAHARA_STATUS_ACTIVE_SKHA)
dev_dbg(dev->device, " - SKHA Active.\n");
if (status & SAHARA_STATUS_MODE_BATCH)
dev_dbg(dev->device, " - Batch Mode.\n");
else if (status & SAHARA_STATUS_MODE_DEDICATED)
dev_dbg(dev->device, " - Dedicated Mode.\n");
else if (status & SAHARA_STATUS_MODE_DEBUG)
dev_dbg(dev->device, " - Debug Mode.\n");
dev_dbg(dev->device, " - Internal state = 0x%02x\n",
SAHARA_STATUS_GET_ISTATE(status));
dev_dbg(dev->device, "Current DAR: 0x%08x\n",
sahara_read(dev, SAHARA_REG_CDAR));
dev_dbg(dev->device, "Initial DAR: 0x%08x\n\n",
sahara_read(dev, SAHARA_REG_IDAR));
}
static void sahara_dump_descriptors(struct sahara_dev *dev)
{
int i;
if (!__is_defined(DEBUG))
return;
for (i = 0; i < SAHARA_MAX_HW_DESC; i++) {
dev_dbg(dev->device, "Descriptor (%d) (%pad):\n",
i, &dev->hw_phys_desc[i]);
dev_dbg(dev->device, "\thdr = 0x%08x\n", dev->hw_desc[i]->hdr);
dev_dbg(dev->device, "\tlen1 = %u\n", dev->hw_desc[i]->len1);
dev_dbg(dev->device, "\tp1 = 0x%08x\n", dev->hw_desc[i]->p1);
dev_dbg(dev->device, "\tlen2 = %u\n", dev->hw_desc[i]->len2);
dev_dbg(dev->device, "\tp2 = 0x%08x\n", dev->hw_desc[i]->p2);
dev_dbg(dev->device, "\tnext = 0x%08x\n",
dev->hw_desc[i]->next);
}
dev_dbg(dev->device, "\n");
}
static void sahara_dump_links(struct sahara_dev *dev)
{
int i;
if (!__is_defined(DEBUG))
return;
for (i = 0; i < SAHARA_MAX_HW_LINK; i++) {
dev_dbg(dev->device, "Link (%d) (%pad):\n",
i, &dev->hw_phys_link[i]);
dev_dbg(dev->device, "\tlen = %u\n", dev->hw_link[i]->len);
dev_dbg(dev->device, "\tp = 0x%08x\n", dev->hw_link[i]->p);
dev_dbg(dev->device, "\tnext = 0x%08x\n",
dev->hw_link[i]->next);
}
dev_dbg(dev->device, "\n");
}
static int sahara_hw_descriptor_create(struct sahara_dev *dev)
{
struct sahara_ctx *ctx = dev->ctx;
struct scatterlist *sg;
int ret;
int i, j;
int idx = 0;
/* Copy new key if necessary */
if (ctx->flags & FLAGS_NEW_KEY) {
memcpy(dev->key_base, ctx->key, ctx->keylen);
ctx->flags &= ~FLAGS_NEW_KEY;
if (dev->flags & FLAGS_CBC) {
dev->hw_desc[idx]->len1 = AES_BLOCK_SIZE;
dev->hw_desc[idx]->p1 = dev->iv_phys_base;
} else {
dev->hw_desc[idx]->len1 = 0;
dev->hw_desc[idx]->p1 = 0;
}
dev->hw_desc[idx]->len2 = ctx->keylen;
dev->hw_desc[idx]->p2 = dev->key_phys_base;
dev->hw_desc[idx]->next = dev->hw_phys_desc[1];
dev->hw_desc[idx]->hdr = sahara_aes_key_hdr(dev);
idx++;
}
dev->nb_in_sg = sg_nents_for_len(dev->in_sg, dev->total);
if (dev->nb_in_sg < 0) {
dev_err(dev->device, "Invalid numbers of src SG.\n");
return dev->nb_in_sg;
}
dev->nb_out_sg = sg_nents_for_len(dev->out_sg, dev->total);
if (dev->nb_out_sg < 0) {
dev_err(dev->device, "Invalid numbers of dst SG.\n");
return dev->nb_out_sg;
}
if ((dev->nb_in_sg + dev->nb_out_sg) > SAHARA_MAX_HW_LINK) {
dev_err(dev->device, "not enough hw links (%d)\n",
dev->nb_in_sg + dev->nb_out_sg);
return -EINVAL;
}
ret = dma_map_sg(dev->device, dev->in_sg, dev->nb_in_sg,
DMA_TO_DEVICE);
if (ret != dev->nb_in_sg) {
dev_err(dev->device, "couldn't map in sg\n");
goto unmap_in;
}
ret = dma_map_sg(dev->device, dev->out_sg, dev->nb_out_sg,
DMA_FROM_DEVICE);
if (ret != dev->nb_out_sg) {
dev_err(dev->device, "couldn't map out sg\n");
goto unmap_out;
}
/* Create input links */
dev->hw_desc[idx]->p1 = dev->hw_phys_link[0];
sg = dev->in_sg;
for (i = 0; i < dev->nb_in_sg; i++) {
dev->hw_link[i]->len = sg->length;
dev->hw_link[i]->p = sg->dma_address;
if (i == (dev->nb_in_sg - 1)) {
dev->hw_link[i]->next = 0;
} else {
dev->hw_link[i]->next = dev->hw_phys_link[i + 1];
sg = sg_next(sg);
}
}
/* Create output links */
dev->hw_desc[idx]->p2 = dev->hw_phys_link[i];
sg = dev->out_sg;
for (j = i; j < dev->nb_out_sg + i; j++) {
dev->hw_link[j]->len = sg->length;
dev->hw_link[j]->p = sg->dma_address;
if (j == (dev->nb_out_sg + i - 1)) {
dev->hw_link[j]->next = 0;
} else {
dev->hw_link[j]->next = dev->hw_phys_link[j + 1];
sg = sg_next(sg);
}
}
/* Fill remaining fields of hw_desc[1] */
dev->hw_desc[idx]->hdr = sahara_aes_data_link_hdr(dev);
dev->hw_desc[idx]->len1 = dev->total;
dev->hw_desc[idx]->len2 = dev->total;
dev->hw_desc[idx]->next = 0;
sahara_dump_descriptors(dev);
sahara_dump_links(dev);
sahara_write(dev, dev->hw_phys_desc[0], SAHARA_REG_DAR);
return 0;
unmap_out:
dma_unmap_sg(dev->device, dev->out_sg, dev->nb_out_sg,
DMA_FROM_DEVICE);
unmap_in:
dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
DMA_TO_DEVICE);
return -EINVAL;
}
static int sahara_aes_process(struct skcipher_request *req)
{
struct sahara_dev *dev = dev_ptr;
struct sahara_ctx *ctx;
struct sahara_aes_reqctx *rctx;
int ret;
unsigned long timeout;
/* Request is ready to be dispatched by the device */
dev_dbg(dev->device,
"dispatch request (nbytes=%d, src=%p, dst=%p)\n",
req->cryptlen, req->src, req->dst);
/* assign new request to device */
dev->total = req->cryptlen;
dev->in_sg = req->src;
dev->out_sg = req->dst;
rctx = skcipher_request_ctx(req);
ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
rctx->mode &= FLAGS_MODE_MASK;
dev->flags = (dev->flags & ~FLAGS_MODE_MASK) | rctx->mode;
if ((dev->flags & FLAGS_CBC) && req->iv)
memcpy(dev->iv_base, req->iv, AES_KEYSIZE_128);
/* assign new context to device */
dev->ctx = ctx;
reinit_completion(&dev->dma_completion);
ret = sahara_hw_descriptor_create(dev);
if (ret)
return -EINVAL;
timeout = wait_for_completion_timeout(&dev->dma_completion,
msecs_to_jiffies(SAHARA_TIMEOUT_MS));
if (!timeout) {
dev_err(dev->device, "AES timeout\n");
return -ETIMEDOUT;
}
dma_unmap_sg(dev->device, dev->out_sg, dev->nb_out_sg,
DMA_FROM_DEVICE);
dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
DMA_TO_DEVICE);
return 0;
}
static int sahara_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct sahara_ctx *ctx = crypto_skcipher_ctx(tfm);
ctx->keylen = keylen;
/* SAHARA only supports 128bit keys */
if (keylen == AES_KEYSIZE_128) {
memcpy(ctx->key, key, keylen);
ctx->flags |= FLAGS_NEW_KEY;
return 0;
}
if (keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_256)
return -EINVAL;
/*
* The requested key size is not supported by HW, do a fallback.
*/
crypto_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
CRYPTO_TFM_REQ_MASK);
return crypto_skcipher_setkey(ctx->fallback, key, keylen);
}
static int sahara_aes_crypt(struct skcipher_request *req, unsigned long mode)
{
struct sahara_aes_reqctx *rctx = skcipher_request_ctx(req);
struct sahara_dev *dev = dev_ptr;
int err = 0;
dev_dbg(dev->device, "nbytes: %d, enc: %d, cbc: %d\n",
req->cryptlen, !!(mode & FLAGS_ENCRYPT), !!(mode & FLAGS_CBC));
if (!IS_ALIGNED(req->cryptlen, AES_BLOCK_SIZE)) {
dev_err(dev->device,
"request size is not exact amount of AES blocks\n");
return -EINVAL;
}
rctx->mode = mode;
mutex_lock(&dev->queue_mutex);
err = crypto_enqueue_request(&dev->queue, &req->base);
mutex_unlock(&dev->queue_mutex);
wake_up_process(dev->kthread);
return err;
}
static int sahara_aes_ecb_encrypt(struct skcipher_request *req)
{
struct sahara_aes_reqctx *rctx = skcipher_request_ctx(req);
struct sahara_ctx *ctx = crypto_skcipher_ctx(
crypto_skcipher_reqtfm(req));
if (unlikely(ctx->keylen != AES_KEYSIZE_128)) {
skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
skcipher_request_set_callback(&rctx->fallback_req,
req->base.flags,
req->base.complete,
req->base.data);
skcipher_request_set_crypt(&rctx->fallback_req, req->src,
req->dst, req->cryptlen, req->iv);
return crypto_skcipher_encrypt(&rctx->fallback_req);
}
return sahara_aes_crypt(req, FLAGS_ENCRYPT);
}
static int sahara_aes_ecb_decrypt(struct skcipher_request *req)
{
struct sahara_aes_reqctx *rctx = skcipher_request_ctx(req);
struct sahara_ctx *ctx = crypto_skcipher_ctx(
crypto_skcipher_reqtfm(req));
if (unlikely(ctx->keylen != AES_KEYSIZE_128)) {
skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
skcipher_request_set_callback(&rctx->fallback_req,
req->base.flags,
req->base.complete,
req->base.data);
skcipher_request_set_crypt(&rctx->fallback_req, req->src,
req->dst, req->cryptlen, req->iv);
return crypto_skcipher_decrypt(&rctx->fallback_req);
}
return sahara_aes_crypt(req, 0);
}
static int sahara_aes_cbc_encrypt(struct skcipher_request *req)
{
struct sahara_aes_reqctx *rctx = skcipher_request_ctx(req);
struct sahara_ctx *ctx = crypto_skcipher_ctx(
crypto_skcipher_reqtfm(req));
if (unlikely(ctx->keylen != AES_KEYSIZE_128)) {
skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
skcipher_request_set_callback(&rctx->fallback_req,
req->base.flags,
req->base.complete,
req->base.data);
skcipher_request_set_crypt(&rctx->fallback_req, req->src,
req->dst, req->cryptlen, req->iv);
return crypto_skcipher_encrypt(&rctx->fallback_req);
}
return sahara_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
}
static int sahara_aes_cbc_decrypt(struct skcipher_request *req)
{
struct sahara_aes_reqctx *rctx = skcipher_request_ctx(req);
struct sahara_ctx *ctx = crypto_skcipher_ctx(
crypto_skcipher_reqtfm(req));
if (unlikely(ctx->keylen != AES_KEYSIZE_128)) {
skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
skcipher_request_set_callback(&rctx->fallback_req,
req->base.flags,
req->base.complete,
req->base.data);
skcipher_request_set_crypt(&rctx->fallback_req, req->src,
req->dst, req->cryptlen, req->iv);
return crypto_skcipher_decrypt(&rctx->fallback_req);
}
return sahara_aes_crypt(req, FLAGS_CBC);
}
static int sahara_aes_init_tfm(struct crypto_skcipher *tfm)
{
const char *name = crypto_tfm_alg_name(&tfm->base);
struct sahara_ctx *ctx = crypto_skcipher_ctx(tfm);
ctx->fallback = crypto_alloc_skcipher(name, 0,
CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(ctx->fallback)) {
pr_err("Error allocating fallback algo %s\n", name);
return PTR_ERR(ctx->fallback);
}
crypto_skcipher_set_reqsize(tfm, sizeof(struct sahara_aes_reqctx) +
crypto_skcipher_reqsize(ctx->fallback));
return 0;
}
static void sahara_aes_exit_tfm(struct crypto_skcipher *tfm)
{
struct sahara_ctx *ctx = crypto_skcipher_ctx(tfm);
crypto_free_skcipher(ctx->fallback);
}
static u32 sahara_sha_init_hdr(struct sahara_dev *dev,
struct sahara_sha_reqctx *rctx)
{
u32 hdr = 0;
hdr = rctx->mode;
if (rctx->first) {
hdr |= SAHARA_HDR_MDHA_SET_MODE_HASH;
hdr |= SAHARA_HDR_MDHA_INIT;
} else {
hdr |= SAHARA_HDR_MDHA_SET_MODE_MD_KEY;
}
if (rctx->last)
hdr |= SAHARA_HDR_MDHA_PDATA;
if (hweight_long(hdr) % 2 == 0)
hdr |= SAHARA_HDR_PARITY_BIT;
return hdr;
}
static int sahara_sha_hw_links_create(struct sahara_dev *dev,
struct sahara_sha_reqctx *rctx,
int start)
{
struct scatterlist *sg;
unsigned int i;
int ret;
dev->in_sg = rctx->in_sg;
dev->nb_in_sg = sg_nents_for_len(dev->in_sg, rctx->total);
if (dev->nb_in_sg < 0) {
dev_err(dev->device, "Invalid numbers of src SG.\n");
return dev->nb_in_sg;
}
if ((dev->nb_in_sg) > SAHARA_MAX_HW_LINK) {
dev_err(dev->device, "not enough hw links (%d)\n",
dev->nb_in_sg + dev->nb_out_sg);
return -EINVAL;
}
sg = dev->in_sg;
ret = dma_map_sg(dev->device, dev->in_sg, dev->nb_in_sg, DMA_TO_DEVICE);
if (!ret)
return -EFAULT;
for (i = start; i < dev->nb_in_sg + start; i++) {
dev->hw_link[i]->len = sg->length;
dev->hw_link[i]->p = sg->dma_address;
if (i == (dev->nb_in_sg + start - 1)) {
dev->hw_link[i]->next = 0;
} else {
dev->hw_link[i]->next = dev->hw_phys_link[i + 1];
sg = sg_next(sg);
}
}
return i;
}
static int sahara_sha_hw_data_descriptor_create(struct sahara_dev *dev,
struct sahara_sha_reqctx *rctx,
struct ahash_request *req,
int index)
{
unsigned result_len;
int i = index;
if (rctx->first)
/* Create initial descriptor: #8*/
dev->hw_desc[index]->hdr = sahara_sha_init_hdr(dev, rctx);
else
/* Create hash descriptor: #10. Must follow #6. */
dev->hw_desc[index]->hdr = SAHARA_HDR_MDHA_HASH;
dev->hw_desc[index]->len1 = rctx->total;
if (dev->hw_desc[index]->len1 == 0) {
/* if len1 is 0, p1 must be 0, too */
dev->hw_desc[index]->p1 = 0;
rctx->sg_in_idx = 0;
} else {
/* Create input links */
dev->hw_desc[index]->p1 = dev->hw_phys_link[index];
i = sahara_sha_hw_links_create(dev, rctx, index);
rctx->sg_in_idx = index;
if (i < 0)
return i;
}
dev->hw_desc[index]->p2 = dev->hw_phys_link[i];
/* Save the context for the next operation */
result_len = rctx->context_size;
dev->hw_link[i]->p = dev->context_phys_base;
dev->hw_link[i]->len = result_len;
dev->hw_desc[index]->len2 = result_len;
dev->hw_link[i]->next = 0;
return 0;
}
/*
* Load descriptor aka #6
*
* To load a previously saved context back to the MDHA unit
*
* p1: Saved Context
* p2: NULL
*
*/
static int sahara_sha_hw_context_descriptor_create(struct sahara_dev *dev,
struct sahara_sha_reqctx *rctx,
struct ahash_request *req,
int index)
{
dev->hw_desc[index]->hdr = sahara_sha_init_hdr(dev, rctx);
dev->hw_desc[index]->len1 = rctx->context_size;
dev->hw_desc[index]->p1 = dev->hw_phys_link[index];
dev->hw_desc[index]->len2 = 0;
dev->hw_desc[index]->p2 = 0;
dev->hw_link[index]->len = rctx->context_size;
dev->hw_link[index]->p = dev->context_phys_base;
dev->hw_link[index]->next = 0;
return 0;
}
static int sahara_walk_and_recalc(struct scatterlist *sg, unsigned int nbytes)
{
if (!sg || !sg->length)
return nbytes;
while (nbytes && sg) {
if (nbytes <= sg->length) {
sg->length = nbytes;
sg_mark_end(sg);
break;
}
nbytes -= sg->length;
sg = sg_next(sg);
}
return nbytes;
}
static int sahara_sha_prepare_request(struct ahash_request *req)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
unsigned int hash_later;
unsigned int block_size;
unsigned int len;
block_size = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
/* append bytes from previous operation */
len = rctx->buf_cnt + req->nbytes;
/* only the last transfer can be padded in hardware */
if (!rctx->last && (len < block_size)) {
/* to few data, save for next operation */
scatterwalk_map_and_copy(rctx->buf + rctx->buf_cnt, req->src,
0, req->nbytes, 0);
rctx->buf_cnt += req->nbytes;
return 0;
}
/* add data from previous operation first */
if (rctx->buf_cnt)
memcpy(rctx->rembuf, rctx->buf, rctx->buf_cnt);
/* data must always be a multiple of block_size */
hash_later = rctx->last ? 0 : len & (block_size - 1);
if (hash_later) {
unsigned int offset = req->nbytes - hash_later;
/* Save remaining bytes for later use */
scatterwalk_map_and_copy(rctx->buf, req->src, offset,
hash_later, 0);
}
/* nbytes should now be multiple of blocksize */
req->nbytes = req->nbytes - hash_later;
sahara_walk_and_recalc(req->src, req->nbytes);
/* have data from previous operation and current */
if (rctx->buf_cnt && req->nbytes) {
sg_init_table(rctx->in_sg_chain, 2);
sg_set_buf(rctx->in_sg_chain, rctx->rembuf, rctx->buf_cnt);
sg_chain(rctx->in_sg_chain, 2, req->src);
rctx->total = req->nbytes + rctx->buf_cnt;
rctx->in_sg = rctx->in_sg_chain;
req->src = rctx->in_sg_chain;
/* only data from previous operation */
} else if (rctx->buf_cnt) {
if (req->src)
rctx->in_sg = req->src;
else
rctx->in_sg = rctx->in_sg_chain;
/* buf was copied into rembuf above */
sg_init_one(rctx->in_sg, rctx->rembuf, rctx->buf_cnt);
rctx->total = rctx->buf_cnt;
/* no data from previous operation */
} else {
rctx->in_sg = req->src;
rctx->total = req->nbytes;
req->src = rctx->in_sg;
}
/* on next call, we only have the remaining data in the buffer */
rctx->buf_cnt = hash_later;
return -EINPROGRESS;
}
static int sahara_sha_process(struct ahash_request *req)
{
struct sahara_dev *dev = dev_ptr;
struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
int ret;
unsigned long timeout;
ret = sahara_sha_prepare_request(req);
if (!ret)
return ret;
if (rctx->first) {
sahara_sha_hw_data_descriptor_create(dev, rctx, req, 0);
dev->hw_desc[0]->next = 0;
rctx->first = 0;
} else {