drivers/crypto/marvell/tdma.c

   1 /*
   2  * Provide TDMA helper functions used by cipher and hash algorithm
   3  * implementations.
   4  *
   5  * Author: Boris Brezillon <boris.brezillon@free-electrons.com>
   6  * Author: Arnaud Ebalard <arno@natisbad.org>
   7  *
   8  * This work is based on an initial version written by
   9  * Sebastian Andrzej Siewior < sebastian at breakpoint dot cc >
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU General Public License version 2 as published
  13  * by the Free Software Foundation.
  14  */
  15
  16 #include "cesa.h"
  17
  18 bool mv_cesa_req_dma_iter_next_transfer(struct mv_cesa_dma_iter *iter,
  19                                         struct mv_cesa_sg_dma_iter *sgiter,
  20                                         unsigned int len)
  21 {
  22         if (!sgiter->sg)
  23                 return false;
  24
  25         sgiter->op_offset += len;
  26         sgiter->offset += len;
  27         if (sgiter->offset == sg_dma_len(sgiter->sg)) {
  28                 if (sg_is_last(sgiter->sg))
  29                         return false;
  30                 sgiter->offset = 0;
  31                 sgiter->sg = sg_next(sgiter->sg);
  32         }
  33
  34         if (sgiter->op_offset == iter->op_len)
  35                 return false;
  36
  37         return true;
  38 }
  39
  40 void mv_cesa_dma_step(struct mv_cesa_req *dreq)
  41 {
  42         struct mv_cesa_engine *engine = dreq->engine;
  43
  44         writel_relaxed(0, engine->regs + CESA_SA_CFG);
  45
  46         mv_cesa_set_int_mask(engine, CESA_SA_INT_ACC0_IDMA_DONE);
  47         writel_relaxed(CESA_TDMA_DST_BURST_128B | CESA_TDMA_SRC_BURST_128B |
  48                        CESA_TDMA_NO_BYTE_SWAP | CESA_TDMA_EN,
  49                        engine->regs + CESA_TDMA_CONTROL);
  50
  51         writel_relaxed(CESA_SA_CFG_ACT_CH0_IDMA | CESA_SA_CFG_MULTI_PKT |
  52                        CESA_SA_CFG_CH0_W_IDMA | CESA_SA_CFG_PARA_DIS,
  53                        engine->regs + CESA_SA_CFG);
  54         writel_relaxed(dreq->chain.first->cur_dma,
  55                        engine->regs + CESA_TDMA_NEXT_ADDR);
  56         BUG_ON(readl(engine->regs + CESA_SA_CMD) &
  57                CESA_SA_CMD_EN_CESA_SA_ACCL0);
  58         writel(CESA_SA_CMD_EN_CESA_SA_ACCL0, engine->regs + CESA_SA_CMD);
  59 }
  60
  61 void mv_cesa_dma_cleanup(struct mv_cesa_req *dreq)
  62 {
  63         struct mv_cesa_tdma_desc *tdma;
  64
  65         for (tdma = dreq->chain.first; tdma;) {
  66                 struct mv_cesa_tdma_desc *old_tdma = tdma;
  67                 u32 type = tdma->flags & CESA_TDMA_TYPE_MSK;
  68
  69                 if (type == CESA_TDMA_OP)
  70                         dma_pool_free(cesa_dev->dma->op_pool, tdma->op,
  71                                       le32_to_cpu(tdma->src));
  72                 else if (type == CESA_TDMA_IV)
  73                         dma_pool_free(cesa_dev->dma->iv_pool, tdma->data,
  74                                       le32_to_cpu(tdma->dst));
  75
  76                 tdma = tdma->next;
  77                 dma_pool_free(cesa_dev->dma->tdma_desc_pool, old_tdma,
  78                               old_tdma->cur_dma);
  79         }
  80
  81         dreq->chain.first = NULL;
  82         dreq->chain.last = NULL;
  83 }
  84
  85 void mv_cesa_dma_prepare(struct mv_cesa_req *dreq,
  86                          struct mv_cesa_engine *engine)
  87 {
  88         struct mv_cesa_tdma_desc *tdma;
  89
  90         for (tdma = dreq->chain.first; tdma; tdma = tdma->next) {
  91                 if (tdma->flags & CESA_TDMA_DST_IN_SRAM)
  92                         tdma->dst = cpu_to_le32(tdma->dst + engine->sram_dma);
  93
  94                 if (tdma->flags & CESA_TDMA_SRC_IN_SRAM)
  95                         tdma->src = cpu_to_le32(tdma->src + engine->sram_dma);
  96
  97                 if ((tdma->flags & CESA_TDMA_TYPE_MSK) == CESA_TDMA_OP)
  98                         mv_cesa_adjust_op(engine, tdma->op);
  99         }
 100 }
 101
 102 void mv_cesa_tdma_chain(struct mv_cesa_engine *engine,
 103                         struct mv_cesa_req *dreq)
 104 {
 105         if (engine->chain.first == NULL && engine->chain.last == NULL) {
 106                 engine->chain.first = dreq->chain.first;
 107                 engine->chain.last  = dreq->chain.last;
 108         } else {
 109                 struct mv_cesa_tdma_desc *last;
 110
 111                 last = engine->chain.last;
 112                 last->next = dreq->chain.first;
 113                 engine->chain.last = dreq->chain.last;
 114
 115                 if (!(last->flags & CESA_TDMA_BREAK_CHAIN))
 116                         last->next_dma = dreq->chain.first->cur_dma;
 117         }
 118 }
 119
 120 int mv_cesa_tdma_process(struct mv_cesa_engine *engine, u32 status)
 121 {
 122         struct crypto_async_request *req = NULL;
 123         struct mv_cesa_tdma_desc *tdma = NULL, *next = NULL;
 124         dma_addr_t tdma_cur;
 125         int res = 0;
 126
 127         tdma_cur = readl(engine->regs + CESA_TDMA_CUR);
 128
 129         for (tdma = engine->chain.first; tdma; tdma = next) {
 130                 spin_lock_bh(&engine->lock);
 131                 next = tdma->next;
 132                 spin_unlock_bh(&engine->lock);
 133
 134                 if (tdma->flags & CESA_TDMA_END_OF_REQ) {
 135                         struct crypto_async_request *backlog = NULL;
 136                         struct mv_cesa_ctx *ctx;
 137                         u32 current_status;
 138
 139                         spin_lock_bh(&engine->lock);
 140                         /*
 141                          * if req is NULL, this means we're processing the
 142                          * request in engine->req.
 143                          */
 144                         if (!req)
 145                                 req = engine->req;
 146                         else
 147                                 req = mv_cesa_dequeue_req_locked(engine,
 148                                                                  &backlog);
 149
 150                         /* Re-chaining to the next request */
 151                         engine->chain.first = tdma->next;
 152                         tdma->next = NULL;
 153
 154                         /* If this is the last request, clear the chain */
 155                         if (engine->chain.first == NULL)
 156                                 engine->chain.last  = NULL;
 157                         spin_unlock_bh(&engine->lock);
 158
 159                         ctx = crypto_tfm_ctx(req->tfm);
 160                         current_status = (tdma->cur_dma == tdma_cur) ?
 161                                           status : CESA_SA_INT_ACC0_IDMA_DONE;
 162                         res = ctx->ops->process(req, current_status);
 163                         ctx->ops->complete(req);
 164
 165                         if (res == 0)
 166                                 mv_cesa_engine_enqueue_complete_request(engine,
 167                                                                         req);
 168
 169                         if (backlog)
 170                                 backlog->complete(backlog, -EINPROGRESS);
 171                 }
 172
 173                 if (res || tdma->cur_dma == tdma_cur)
 174                         break;
 175         }
 176
 177         /* Save the last request in error to engine->req, so that the core
 178          * knows which request was fautly */
 179         if (res) {
 180                 spin_lock_bh(&engine->lock);
 181                 engine->req = req;
 182                 spin_unlock_bh(&engine->lock);
 183         }
 184
 185         return res;
 186 }
 187
 188 static struct mv_cesa_tdma_desc *
 189 mv_cesa_dma_add_desc(struct mv_cesa_tdma_chain *chain, gfp_t flags)
 190 {
 191         struct mv_cesa_tdma_desc *new_tdma = NULL;
 192         dma_addr_t dma_handle;
 193
 194         new_tdma = dma_pool_zalloc(cesa_dev->dma->tdma_desc_pool, flags,
 195                                    &dma_handle);
 196         if (!new_tdma)
 197                 return ERR_PTR(-ENOMEM);
 198
 199         new_tdma->cur_dma = dma_handle;
 200         if (chain->last) {
 201                 chain->last->next_dma = cpu_to_le32(dma_handle);
 202                 chain->last->next = new_tdma;
 203         } else {
 204                 chain->first = new_tdma;
 205         }
 206
 207         chain->last = new_tdma;
 208
 209         return new_tdma;
 210 }
 211
 212 int mv_cesa_dma_add_iv_op(struct mv_cesa_tdma_chain *chain, dma_addr_t src,
 213                           u32 size, u32 flags, gfp_t gfp_flags)
 214 {
 215
 216         struct mv_cesa_tdma_desc *tdma;
 217         u8 *iv;
 218         dma_addr_t dma_handle;
 219
 220         tdma = mv_cesa_dma_add_desc(chain, gfp_flags);
 221         if (IS_ERR(tdma))
 222                 return PTR_ERR(tdma);
 223
 224         iv = dma_pool_alloc(cesa_dev->dma->iv_pool, gfp_flags, &dma_handle);
 225         if (!iv)
 226                 return -ENOMEM;
 227
 228         tdma->byte_cnt = cpu_to_le32(size | BIT(31));
 229         tdma->src = src;
 230         tdma->dst = cpu_to_le32(dma_handle);
 231         tdma->data = iv;
 232
 233         flags &= (CESA_TDMA_DST_IN_SRAM | CESA_TDMA_SRC_IN_SRAM);
 234         tdma->flags = flags | CESA_TDMA_IV;
 235         return 0;
 236 }
 237
 238 struct mv_cesa_op_ctx *mv_cesa_dma_add_op(struct mv_cesa_tdma_chain *chain,
 239                                         const struct mv_cesa_op_ctx *op_templ,
 240                                         bool skip_ctx,
 241                                         gfp_t flags)
 242 {
 243         struct mv_cesa_tdma_desc *tdma;
 244         struct mv_cesa_op_ctx *op;
 245         dma_addr_t dma_handle;
 246         unsigned int size;
 247
 248         tdma = mv_cesa_dma_add_desc(chain, flags);
 249         if (IS_ERR(tdma))
 250                 return ERR_CAST(tdma);
 251
 252         op = dma_pool_alloc(cesa_dev->dma->op_pool, flags, &dma_handle);
 253         if (!op)
 254                 return ERR_PTR(-ENOMEM);
 255
 256         *op = *op_templ;
 257
 258         size = skip_ctx ? sizeof(op->desc) : sizeof(*op);
 259
 260         tdma = chain->last;
 261         tdma->op = op;
 262         tdma->byte_cnt = cpu_to_le32(size | BIT(31));
 263         tdma->src = cpu_to_le32(dma_handle);
 264         tdma->dst = CESA_SA_CFG_SRAM_OFFSET;
 265         tdma->flags = CESA_TDMA_DST_IN_SRAM | CESA_TDMA_OP;
 266
 267         return op;
 268 }
 269
 270 int mv_cesa_dma_add_data_transfer(struct mv_cesa_tdma_chain *chain,
 271                                   dma_addr_t dst, dma_addr_t src, u32 size,
 272                                   u32 flags, gfp_t gfp_flags)
 273 {
 274         struct mv_cesa_tdma_desc *tdma;
 275
 276         tdma = mv_cesa_dma_add_desc(chain, gfp_flags);
 277         if (IS_ERR(tdma))
 278                 return PTR_ERR(tdma);
 279
 280         tdma->byte_cnt = cpu_to_le32(size | BIT(31));
 281         tdma->src = src;
 282         tdma->dst = dst;
 283
 284         flags &= (CESA_TDMA_DST_IN_SRAM | CESA_TDMA_SRC_IN_SRAM);
 285         tdma->flags = flags | CESA_TDMA_DATA;
 286
 287         return 0;
 288 }
 289
 290 int mv_cesa_dma_add_dummy_launch(struct mv_cesa_tdma_chain *chain, gfp_t flags)
 291 {
 292         struct mv_cesa_tdma_desc *tdma;
 293
 294         tdma = mv_cesa_dma_add_desc(chain, flags);
 295         if (IS_ERR(tdma))
 296                 return PTR_ERR(tdma);
 297
 298         return 0;
 299 }
 300
 301 int mv_cesa_dma_add_dummy_end(struct mv_cesa_tdma_chain *chain, gfp_t flags)
 302 {
 303         struct mv_cesa_tdma_desc *tdma;
 304
 305         tdma = mv_cesa_dma_add_desc(chain, flags);
 306         if (IS_ERR(tdma))
 307                 return PTR_ERR(tdma);
 308
 309         tdma->byte_cnt = cpu_to_le32(BIT(31));
 310
 311         return 0;
 312 }
 313
 314 int mv_cesa_dma_add_op_transfers(struct mv_cesa_tdma_chain *chain,
 315                                  struct mv_cesa_dma_iter *dma_iter,
 316                                  struct mv_cesa_sg_dma_iter *sgiter,
 317                                  gfp_t gfp_flags)
 318 {
 319         u32 flags = sgiter->dir == DMA_TO_DEVICE ?
 320                     CESA_TDMA_DST_IN_SRAM : CESA_TDMA_SRC_IN_SRAM;
 321         unsigned int len;
 322
 323         do {
 324                 dma_addr_t dst, src;
 325                 int ret;
 326
 327                 len = mv_cesa_req_dma_iter_transfer_len(dma_iter, sgiter);
 328                 if (sgiter->dir == DMA_TO_DEVICE) {
 329                         dst = CESA_SA_DATA_SRAM_OFFSET + sgiter->op_offset;
 330                         src = sg_dma_address(sgiter->sg) + sgiter->offset;
 331                 } else {
 332                         dst = sg_dma_address(sgiter->sg) + sgiter->offset;
 333                         src = CESA_SA_DATA_SRAM_OFFSET + sgiter->op_offset;
 334                 }
 335
 336                 ret = mv_cesa_dma_add_data_transfer(chain, dst, src, len,
 337                                                     flags, gfp_flags);
 338                 if (ret)
 339                         return ret;
 340
 341         } while (mv_cesa_req_dma_iter_next_transfer(dma_iter, sgiter, len));
 342
 343         return 0;
 344 }