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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_tdma_req *dreq)
{
struct mv_cesa_engine *engine = dreq->base.engine;
writel(0, engine->regs + CESA_SA_CFG);
mv_cesa_set_int_mask(engine, CESA_SA_INT_ACC0_IDMA_DONE);
writel(CESA_TDMA_DST_BURST_128B | CESA_TDMA_SRC_BURST_128B |
CESA_TDMA_NO_BYTE_SWAP | CESA_TDMA_EN,
engine->regs + CESA_TDMA_CONTROL);
writel(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(dreq->chain.first->cur_dma,
engine->regs + CESA_TDMA_NEXT_ADDR);
writel(CESA_SA_CMD_EN_CESA_SA_ACCL0, engine->regs + CESA_SA_CMD);
}
void mv_cesa_dma_cleanup(struct mv_cesa_tdma_req *dreq)
{
struct mv_cesa_tdma_desc *tdma;
for (tdma = dreq->chain.first; tdma;) {
struct mv_cesa_tdma_desc *old_tdma = tdma;
if (tdma->flags & 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,
le32_to_cpu(old_tdma->cur_dma));
}
dreq->chain.first = NULL;
dreq->chain.last = NULL;
}
void mv_cesa_dma_prepare(struct mv_cesa_tdma_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_OP)
mv_cesa_adjust_op(engine, tdma->op);
}
}
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_alloc(cesa_dev->dma->tdma_desc_pool, flags,
&dma_handle);
if (!new_tdma)
return ERR_PTR(-ENOMEM);
memset(new_tdma, 0, sizeof(*new_tdma));
new_tdma->cur_dma = cpu_to_le32(dma_handle);
if (chain->last) {
chain->last->next_dma = new_tdma->cur_dma;
chain->last->next = new_tdma;
} else {
chain->first = new_tdma;
}
chain->last = new_tdma;
return new_tdma;
}
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;
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;
tdma = chain->last;
tdma->op = op;
tdma->byte_cnt = (skip_ctx ? sizeof(op->desc) : sizeof(*op)) | BIT(31);
tdma->src = dma_handle;
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 = 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,
u32 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, u32 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 = 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;
}
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