linux/drivers/crypto/marvell/tdma.c

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/*
* Provide TDMA helper functions used by cipher and hash algorithm
* implementations.
*
* Author: Boris Brezillon <boris.brezillon@free-electrons.com>
* Author: Arnaud Ebalard <arno@natisbad.org>
*
* This work is based on an initial version written by
* Sebastian Andrzej Siewior < sebastian at breakpoint dot cc >
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include "cesa.h"
bool mv_cesa_req_dma_iter_next_transfer(struct mv_cesa_dma_iter *iter,
struct mv_cesa_sg_dma_iter *sgiter,
unsigned int len)
{
if (!sgiter->sg)
return false;
sgiter->op_offset += len;
sgiter->offset += len;
if (sgiter->offset == sg_dma_len(sgiter->sg)) {
if (sg_is_last(sgiter->sg))
return false;
sgiter->offset = 0;
sgiter->sg = sg_next(sgiter->sg);
}
if (sgiter->op_offset == iter->op_len)
return false;
return true;
}
void mv_cesa_dma_step(struct mv_cesa_req *dreq)
{
struct mv_cesa_engine *engine = dreq->engine;
writel_relaxed(0, engine->regs + CESA_SA_CFG);
mv_cesa_set_int_mask(engine, CESA_SA_INT_ACC0_IDMA_DONE);
writel_relaxed(CESA_TDMA_DST_BURST_128B | CESA_TDMA_SRC_BURST_128B |
CESA_TDMA_NO_BYTE_SWAP | CESA_TDMA_EN,
engine->regs + CESA_TDMA_CONTROL);
writel_relaxed(CESA_SA_CFG_ACT_CH0_IDMA | CESA_SA_CFG_MULTI_PKT |
CESA_SA_CFG_CH0_W_IDMA | CESA_SA_CFG_PARA_DIS,
engine->regs + CESA_SA_CFG);
writel_relaxed(dreq->chain.first->cur_dma,
engine->regs + CESA_TDMA_NEXT_ADDR);
BUG_ON(readl(engine->regs + CESA_SA_CMD) &
CESA_SA_CMD_EN_CESA_SA_ACCL0);
writel(CESA_SA_CMD_EN_CESA_SA_ACCL0, engine->regs + CESA_SA_CMD);
}
void mv_cesa_dma_cleanup(struct mv_cesa_req *dreq)
{
struct mv_cesa_tdma_desc *tdma;
for (tdma = dreq->chain.first; tdma;) {
struct mv_cesa_tdma_desc *old_tdma = tdma;
u32 type = tdma->flags & CESA_TDMA_TYPE_MSK;
if (type == CESA_TDMA_OP)
dma_pool_free(cesa_dev->dma->op_pool, tdma->op,
le32_to_cpu(tdma->src));
tdma = tdma->next;
dma_pool_free(cesa_dev->dma->tdma_desc_pool, old_tdma,
old_tdma->cur_dma);
}
dreq->chain.first = NULL;
dreq->chain.last = NULL;
}
void mv_cesa_dma_prepare(struct mv_cesa_req *dreq,
struct mv_cesa_engine *engine)
{
struct mv_cesa_tdma_desc *tdma;
for (tdma = dreq->chain.first; tdma; tdma = tdma->next) {
if (tdma->flags & CESA_TDMA_DST_IN_SRAM)
tdma->dst = cpu_to_le32(tdma->dst + engine->sram_dma);
if (tdma->flags & CESA_TDMA_SRC_IN_SRAM)
tdma->src = cpu_to_le32(tdma->src + engine->sram_dma);
if ((tdma->flags & CESA_TDMA_TYPE_MSK) == CESA_TDMA_OP)
mv_cesa_adjust_op(engine, tdma->op);
}
}
void mv_cesa_tdma_chain(struct mv_cesa_engine *engine,
struct mv_cesa_req *dreq)
{
if (engine->chain.first == NULL && engine->chain.last == NULL) {
engine->chain.first = dreq->chain.first;
engine->chain.last = dreq->chain.last;
} else {
struct mv_cesa_tdma_desc *last;
last = engine->chain.last;
last->next = dreq->chain.first;
engine->chain.last = dreq->chain.last;
/*
* Break the DMA chain if the CESA_TDMA_BREAK_CHAIN is set on
* the last element of the current chain, or if the request
* being queued needs the IV regs to be set before lauching
* the request.
*/
if (!(last->flags & CESA_TDMA_BREAK_CHAIN) &&
!(dreq->chain.first->flags & CESA_TDMA_SET_STATE))
last->next_dma = dreq->chain.first->cur_dma;
}
}
int mv_cesa_tdma_process(struct mv_cesa_engine *engine, u32 status)
{
struct crypto_async_request *req = NULL;
struct mv_cesa_tdma_desc *tdma = NULL, *next = NULL;
dma_addr_t tdma_cur;
int res = 0;
tdma_cur = readl(engine->regs + CESA_TDMA_CUR);
for (tdma = engine->chain.first; tdma; tdma = next) {
spin_lock_bh(&engine->lock);
next = tdma->next;
spin_unlock_bh(&engine->lock);
if (tdma->flags & CESA_TDMA_END_OF_REQ) {
struct crypto_async_request *backlog = NULL;
struct mv_cesa_ctx *ctx;
u32 current_status;
spin_lock_bh(&engine->lock);
/*
* if req is NULL, this means we're processing the
* request in engine->req.
*/
if (!req)
req = engine->req;
else
req = mv_cesa_dequeue_req_locked(engine,
&backlog);
/* Re-chaining to the next request */
engine->chain.first = tdma->next;
tdma->next = NULL;
/* If this is the last request, clear the chain */
if (engine->chain.first == NULL)
engine->chain.last = NULL;
spin_unlock_bh(&engine->lock);
ctx = crypto_tfm_ctx(req->tfm);
current_status = (tdma->cur_dma == tdma_cur) ?
status : CESA_SA_INT_ACC0_IDMA_DONE;
res = ctx->ops->process(req, current_status);
ctx->ops->complete(req);
if (res == 0)
mv_cesa_engine_enqueue_complete_request(engine,
req);
if (backlog)
backlog->complete(backlog, -EINPROGRESS);
}
if (res || tdma->cur_dma == tdma_cur)
break;
}
/* Save the last request in error to engine->req, so that the core
* knows which request was fautly */
if (res) {
spin_lock_bh(&engine->lock);
engine->req = req;
spin_unlock_bh(&engine->lock);
}
return res;
}
static struct mv_cesa_tdma_desc *
mv_cesa_dma_add_desc(struct mv_cesa_tdma_chain *chain, gfp_t flags)
{
struct mv_cesa_tdma_desc *new_tdma = NULL;
dma_addr_t dma_handle;
new_tdma = dma_pool_zalloc(cesa_dev->dma->tdma_desc_pool, flags,
&dma_handle);
if (!new_tdma)
return ERR_PTR(-ENOMEM);
new_tdma->cur_dma = dma_handle;
if (chain->last) {
chain->last->next_dma = cpu_to_le32(dma_handle);
chain->last->next = new_tdma;
} else {
chain->first = new_tdma;
}
chain->last = new_tdma;
return new_tdma;
}
int mv_cesa_dma_add_result_op(struct mv_cesa_tdma_chain *chain, dma_addr_t src,
u32 size, u32 flags, gfp_t gfp_flags)
{
struct mv_cesa_tdma_desc *tdma, *op_desc;
tdma = mv_cesa_dma_add_desc(chain, gfp_flags);
if (IS_ERR(tdma))
return PTR_ERR(tdma);
/* We re-use an existing op_desc object to retrieve the context
* and result instead of allocating a new one.
* There is at least one object of this type in a CESA crypto
* req, just pick the first one in the chain.
*/
for (op_desc = chain->first; op_desc; op_desc = op_desc->next) {
u32 type = op_desc->flags & CESA_TDMA_TYPE_MSK;
if (type == CESA_TDMA_OP)
break;
}
if (!op_desc)
return -EIO;
tdma->byte_cnt = cpu_to_le32(size | BIT(31));
tdma->src = src;
tdma->dst = op_desc->src;
tdma->op = op_desc->op;
flags &= (CESA_TDMA_DST_IN_SRAM | CESA_TDMA_SRC_IN_SRAM);
tdma->flags = flags | CESA_TDMA_RESULT;
return 0;
}
struct mv_cesa_op_ctx *mv_cesa_dma_add_op(struct mv_cesa_tdma_chain *chain,
const struct mv_cesa_op_ctx *op_templ,
bool skip_ctx,
gfp_t flags)
{
struct mv_cesa_tdma_desc *tdma;
struct mv_cesa_op_ctx *op;
dma_addr_t dma_handle;
unsigned int size;
tdma = mv_cesa_dma_add_desc(chain, flags);
if (IS_ERR(tdma))
return ERR_CAST(tdma);
op = dma_pool_alloc(cesa_dev->dma->op_pool, flags, &dma_handle);
if (!op)
return ERR_PTR(-ENOMEM);
*op = *op_templ;
size = skip_ctx ? sizeof(op->desc) : sizeof(*op);
tdma = chain->last;
tdma->op = op;
tdma->byte_cnt = cpu_to_le32(size | BIT(31));
tdma->src = cpu_to_le32(dma_handle);
tdma->dst = CESA_SA_CFG_SRAM_OFFSET;
tdma->flags = CESA_TDMA_DST_IN_SRAM | CESA_TDMA_OP;
return op;
}
int mv_cesa_dma_add_data_transfer(struct mv_cesa_tdma_chain *chain,
dma_addr_t dst, dma_addr_t src, u32 size,
u32 flags, gfp_t gfp_flags)
{
struct mv_cesa_tdma_desc *tdma;
tdma = mv_cesa_dma_add_desc(chain, gfp_flags);
if (IS_ERR(tdma))
return PTR_ERR(tdma);
tdma->byte_cnt = cpu_to_le32(size | BIT(31));
tdma->src = src;
tdma->dst = dst;
flags &= (CESA_TDMA_DST_IN_SRAM | CESA_TDMA_SRC_IN_SRAM);
tdma->flags = flags | CESA_TDMA_DATA;
return 0;
}
int mv_cesa_dma_add_dummy_launch(struct mv_cesa_tdma_chain *chain, gfp_t flags)
{
struct mv_cesa_tdma_desc *tdma;
tdma = mv_cesa_dma_add_desc(chain, flags);
if (IS_ERR(tdma))
return PTR_ERR(tdma);
return 0;
}
int mv_cesa_dma_add_dummy_end(struct mv_cesa_tdma_chain *chain, gfp_t flags)
{
struct mv_cesa_tdma_desc *tdma;
tdma = mv_cesa_dma_add_desc(chain, flags);
if (IS_ERR(tdma))
return PTR_ERR(tdma);
tdma->byte_cnt = cpu_to_le32(BIT(31));
return 0;
}
int mv_cesa_dma_add_op_transfers(struct mv_cesa_tdma_chain *chain,
struct mv_cesa_dma_iter *dma_iter,
struct mv_cesa_sg_dma_iter *sgiter,
gfp_t gfp_flags)
{
u32 flags = sgiter->dir == DMA_TO_DEVICE ?
CESA_TDMA_DST_IN_SRAM : CESA_TDMA_SRC_IN_SRAM;
unsigned int len;
do {
dma_addr_t dst, src;
int ret;
len = mv_cesa_req_dma_iter_transfer_len(dma_iter, sgiter);
if (sgiter->dir == DMA_TO_DEVICE) {
dst = CESA_SA_DATA_SRAM_OFFSET + sgiter->op_offset;
src = sg_dma_address(sgiter->sg) + sgiter->offset;
} else {
dst = sg_dma_address(sgiter->sg) + sgiter->offset;
src = CESA_SA_DATA_SRAM_OFFSET + sgiter->op_offset;
}
ret = mv_cesa_dma_add_data_transfer(chain, dst, src, len,
flags, gfp_flags);
if (ret)
return ret;
} while (mv_cesa_req_dma_iter_next_transfer(dma_iter, sgiter, len));
return 0;
}