drivers/dma/ste_dma40_ll.c

   1 /*
   2  * driver/dma/ste_dma40_ll.c
   3  *
   4  * Copyright (C) ST-Ericsson 2007-2010
   5  * License terms: GNU General Public License (GPL) version 2
   6  * Author: Per Friden <per.friden@stericsson.com>
   7  * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <plat/ste_dma40.h>
  12
  13 #include "ste_dma40_ll.h"
  14
  15 /* Sets up proper LCSP1 and LCSP3 register for a logical channel */
  16 void d40_log_cfg(struct stedma40_chan_cfg *cfg,
  17                  u32 *lcsp1, u32 *lcsp3)
  18 {
  19         u32 l3 = 0; /* dst */
  20         u32 l1 = 0; /* src */
  21
  22         /* src is mem? -> increase address pos */
  23         if (cfg->dir ==  STEDMA40_MEM_TO_PERIPH ||
  24             cfg->dir ==  STEDMA40_MEM_TO_MEM)
  25                 l1 |= 1 << D40_MEM_LCSP1_SCFG_INCR_POS;
  26
  27         /* dst is mem? -> increase address pos */
  28         if (cfg->dir ==  STEDMA40_PERIPH_TO_MEM ||
  29             cfg->dir ==  STEDMA40_MEM_TO_MEM)
  30                 l3 |= 1 << D40_MEM_LCSP3_DCFG_INCR_POS;
  31
  32         /* src is hw? -> master port 1 */
  33         if (cfg->dir ==  STEDMA40_PERIPH_TO_MEM ||
  34             cfg->dir ==  STEDMA40_PERIPH_TO_PERIPH)
  35                 l1 |= 1 << D40_MEM_LCSP1_SCFG_MST_POS;
  36
  37         /* dst is hw? -> master port 1 */
  38         if (cfg->dir ==  STEDMA40_MEM_TO_PERIPH ||
  39             cfg->dir ==  STEDMA40_PERIPH_TO_PERIPH)
  40                 l3 |= 1 << D40_MEM_LCSP3_DCFG_MST_POS;
  41
  42         l3 |= 1 << D40_MEM_LCSP3_DCFG_TIM_POS;
  43         l3 |= 1 << D40_MEM_LCSP3_DCFG_EIM_POS;
  44         l3 |= cfg->dst_info.psize << D40_MEM_LCSP3_DCFG_PSIZE_POS;
  45         l3 |= cfg->dst_info.data_width << D40_MEM_LCSP3_DCFG_ESIZE_POS;
  46         l3 |= 1 << D40_MEM_LCSP3_DTCP_POS;
  47
  48         l1 |= 1 << D40_MEM_LCSP1_SCFG_EIM_POS;
  49         l1 |= cfg->src_info.psize << D40_MEM_LCSP1_SCFG_PSIZE_POS;
  50         l1 |= cfg->src_info.data_width << D40_MEM_LCSP1_SCFG_ESIZE_POS;
  51         l1 |= 1 << D40_MEM_LCSP1_STCP_POS;
  52
  53         *lcsp1 = l1;
  54         *lcsp3 = l3;
  55
  56 }
  57
  58 /* Sets up SRC and DST CFG register for both logical and physical channels */
  59 void d40_phy_cfg(struct stedma40_chan_cfg *cfg,
  60                  u32 *src_cfg, u32 *dst_cfg, bool is_log)
  61 {
  62         u32 src = 0;
  63         u32 dst = 0;
  64
  65         if (!is_log) {
  66                 /* Physical channel */
  67                 if ((cfg->dir ==  STEDMA40_PERIPH_TO_MEM) ||
  68                     (cfg->dir == STEDMA40_PERIPH_TO_PERIPH)) {
  69                         /* Set master port to 1 */
  70                         src |= 1 << D40_SREG_CFG_MST_POS;
  71                         src |= D40_TYPE_TO_EVENT(cfg->src_dev_type);
  72
  73                         if (cfg->src_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
  74                                 src |= 1 << D40_SREG_CFG_PHY_TM_POS;
  75                         else
  76                                 src |= 3 << D40_SREG_CFG_PHY_TM_POS;
  77                 }
  78                 if ((cfg->dir ==  STEDMA40_MEM_TO_PERIPH) ||
  79                     (cfg->dir == STEDMA40_PERIPH_TO_PERIPH)) {
  80                         /* Set master port to 1 */
  81                         dst |= 1 << D40_SREG_CFG_MST_POS;
  82                         dst |= D40_TYPE_TO_EVENT(cfg->dst_dev_type);
  83
  84                         if (cfg->dst_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
  85                                 dst |= 1 << D40_SREG_CFG_PHY_TM_POS;
  86                         else
  87                                 dst |= 3 << D40_SREG_CFG_PHY_TM_POS;
  88                 }
  89                 /* Interrupt on end of transfer for destination */
  90                 dst |= 1 << D40_SREG_CFG_TIM_POS;
  91
  92                 /* Generate interrupt on error */
  93                 src |= 1 << D40_SREG_CFG_EIM_POS;
  94                 dst |= 1 << D40_SREG_CFG_EIM_POS;
  95
  96                 /* PSIZE */
  97                 if (cfg->src_info.psize != STEDMA40_PSIZE_PHY_1) {
  98                         src |= 1 << D40_SREG_CFG_PHY_PEN_POS;
  99                         src |= cfg->src_info.psize << D40_SREG_CFG_PSIZE_POS;
 100                 }
 101                 if (cfg->dst_info.psize != STEDMA40_PSIZE_PHY_1) {
 102                         dst |= 1 << D40_SREG_CFG_PHY_PEN_POS;
 103                         dst |= cfg->dst_info.psize << D40_SREG_CFG_PSIZE_POS;
 104                 }
 105
 106                 /* Element size */
 107                 src |= cfg->src_info.data_width << D40_SREG_CFG_ESIZE_POS;
 108                 dst |= cfg->dst_info.data_width << D40_SREG_CFG_ESIZE_POS;
 109
 110         } else {
 111                 /* Logical channel */
 112                 dst |= 1 << D40_SREG_CFG_LOG_GIM_POS;
 113                 src |= 1 << D40_SREG_CFG_LOG_GIM_POS;
 114         }
 115
 116         if (cfg->channel_type & STEDMA40_HIGH_PRIORITY_CHANNEL) {
 117                 src |= 1 << D40_SREG_CFG_PRI_POS;
 118                 dst |= 1 << D40_SREG_CFG_PRI_POS;
 119         }
 120
 121         src |= cfg->src_info.endianess << D40_SREG_CFG_LBE_POS;
 122         dst |= cfg->dst_info.endianess << D40_SREG_CFG_LBE_POS;
 123
 124         *src_cfg = src;
 125         *dst_cfg = dst;
 126 }
 127
 128 int d40_phy_fill_lli(struct d40_phy_lli *lli,
 129                      dma_addr_t data,
 130                      u32 data_size,
 131                      int psize,
 132                      dma_addr_t next_lli,
 133                      u32 reg_cfg,
 134                      bool term_int,
 135                      u32 data_width,
 136                      bool is_device)
 137 {
 138         int num_elems;
 139
 140         if (psize == STEDMA40_PSIZE_PHY_1)
 141                 num_elems = 1;
 142         else
 143                 num_elems = 2 << psize;
 144
 145         /*
 146          * Size is 16bit. data_width is 8, 16, 32 or 64 bit
 147          * Block large than 64 KiB must be split.
 148          */
 149         if (data_size > (0xffff << data_width))
 150                 return -EINVAL;
 151
 152         /* Must be aligned */
 153         if (!IS_ALIGNED(data, 0x1 << data_width))
 154                 return -EINVAL;
 155
 156         /* Transfer size can't be smaller than (num_elms * elem_size) */
 157         if (data_size < num_elems * (0x1 << data_width))
 158                 return -EINVAL;
 159
 160         /* The number of elements. IE now many chunks */
 161         lli->reg_elt = (data_size >> data_width) << D40_SREG_ELEM_PHY_ECNT_POS;
 162
 163         /*
 164          * Distance to next element sized entry.
 165          * Usually the size of the element unless you want gaps.
 166          */
 167         if (!is_device)
 168                 lli->reg_elt |= (0x1 << data_width) <<
 169                         D40_SREG_ELEM_PHY_EIDX_POS;
 170
 171         /* Where the data is */
 172         lli->reg_ptr = data;
 173         lli->reg_cfg = reg_cfg;
 174
 175         /* If this scatter list entry is the last one, no next link */
 176         if (next_lli == 0)
 177                 lli->reg_lnk = 0x1 << D40_SREG_LNK_PHY_TCP_POS;
 178         else
 179                 lli->reg_lnk = next_lli;
 180
 181         /* Set/clear interrupt generation on this link item.*/
 182         if (term_int)
 183                 lli->reg_cfg |= 0x1 << D40_SREG_CFG_TIM_POS;
 184         else
 185                 lli->reg_cfg &= ~(0x1 << D40_SREG_CFG_TIM_POS);
 186
 187         /* Post link */
 188         lli->reg_lnk |= 0 << D40_SREG_LNK_PHY_PRE_POS;
 189
 190         return 0;
 191 }
 192
 193 int d40_phy_sg_to_lli(struct scatterlist *sg,
 194                       int sg_len,
 195                       dma_addr_t target,
 196                       struct d40_phy_lli *lli,
 197                       dma_addr_t lli_phys,
 198                       u32 reg_cfg,
 199                       u32 data_width,
 200                       int psize,
 201                       bool term_int)
 202 {
 203         int total_size = 0;
 204         int i;
 205         struct scatterlist *current_sg = sg;
 206         dma_addr_t next_lli_phys;
 207         dma_addr_t dst;
 208         int err = 0;
 209
 210         for_each_sg(sg, current_sg, sg_len, i) {
 211
 212                 total_size += sg_dma_len(current_sg);
 213
 214                 /* If this scatter list entry is the last one, no next link */
 215                 if (sg_len - 1 == i)
 216                         next_lli_phys = 0;
 217                 else
 218                         next_lli_phys = ALIGN(lli_phys + (i + 1) *
 219                                               sizeof(struct d40_phy_lli),
 220                                               D40_LLI_ALIGN);
 221
 222                 if (target)
 223                         dst = target;
 224                 else
 225                         dst = sg_phys(current_sg);
 226
 227                 err = d40_phy_fill_lli(&lli[i],
 228                                        dst,
 229                                        sg_dma_len(current_sg),
 230                                        psize,
 231                                        next_lli_phys,
 232                                        reg_cfg,
 233                                        !next_lli_phys,
 234                                        data_width,
 235                                        target == dst);
 236                 if (err)
 237                         goto err;
 238         }
 239
 240         return total_size;
 241  err:
 242         return err;
 243 }
 244
 245
 246 void d40_phy_lli_write(void __iomem *virtbase,
 247                        u32 phy_chan_num,
 248                        struct d40_phy_lli *lli_dst,
 249                        struct d40_phy_lli *lli_src)
 250 {
 251
 252         writel(lli_src->reg_cfg, virtbase + D40_DREG_PCBASE +
 253                phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SSCFG);
 254         writel(lli_src->reg_elt, virtbase + D40_DREG_PCBASE +
 255                phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SSELT);
 256         writel(lli_src->reg_ptr, virtbase + D40_DREG_PCBASE +
 257                phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SSPTR);
 258         writel(lli_src->reg_lnk, virtbase + D40_DREG_PCBASE +
 259                phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SSLNK);
 260
 261         writel(lli_dst->reg_cfg, virtbase + D40_DREG_PCBASE +
 262                phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SDCFG);
 263         writel(lli_dst->reg_elt, virtbase + D40_DREG_PCBASE +
 264                phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SDELT);
 265         writel(lli_dst->reg_ptr, virtbase + D40_DREG_PCBASE +
 266                phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SDPTR);
 267         writel(lli_dst->reg_lnk, virtbase + D40_DREG_PCBASE +
 268                phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SDLNK);
 269
 270 }
 271
 272 /* DMA logical lli operations */
 273
 274 void d40_log_fill_lli(struct d40_log_lli *lli,
 275                       dma_addr_t data, u32 data_size,
 276                       u32 lli_next_off, u32 reg_cfg,
 277                       u32 data_width,
 278                       bool term_int, bool addr_inc)
 279 {
 280         lli->lcsp13 = reg_cfg;
 281
 282         /* The number of elements to transfer */
 283         lli->lcsp02 = ((data_size >> data_width) <<
 284                        D40_MEM_LCSP0_ECNT_POS) & D40_MEM_LCSP0_ECNT_MASK;
 285         /* 16 LSBs address of the current element */
 286         lli->lcsp02 |= data & D40_MEM_LCSP0_SPTR_MASK;
 287         /* 16 MSBs address of the current element */
 288         lli->lcsp13 |= data & D40_MEM_LCSP1_SPTR_MASK;
 289
 290         if (addr_inc)
 291                 lli->lcsp13 |= D40_MEM_LCSP1_SCFG_INCR_MASK;
 292
 293         lli->lcsp13 |= D40_MEM_LCSP3_DTCP_MASK;
 294         /* If this scatter list entry is the last one, no next link */
 295         lli->lcsp13 |= (lli_next_off << D40_MEM_LCSP1_SLOS_POS) &
 296                 D40_MEM_LCSP1_SLOS_MASK;
 297
 298         if (term_int)
 299                 lli->lcsp13 |= D40_MEM_LCSP1_SCFG_TIM_MASK;
 300         else
 301                 lli->lcsp13 &= ~D40_MEM_LCSP1_SCFG_TIM_MASK;
 302 }
 303
 304 int d40_log_sg_to_dev(struct d40_lcla_elem *lcla,
 305                       struct scatterlist *sg,
 306                       int sg_len,
 307                       struct d40_log_lli_bidir *lli,
 308                       struct d40_def_lcsp *lcsp,
 309                       u32 src_data_width,
 310                       u32 dst_data_width,
 311                       enum dma_data_direction direction,
 312                       bool term_int, dma_addr_t dev_addr, int max_len,
 313                       int llis_per_log)
 314 {
 315         int total_size = 0;
 316         struct scatterlist *current_sg = sg;
 317         int i;
 318         u32 next_lli_off_dst;
 319         u32 next_lli_off_src;
 320
 321         next_lli_off_src = 0;
 322         next_lli_off_dst = 0;
 323
 324         for_each_sg(sg, current_sg, sg_len, i) {
 325                 total_size += sg_dma_len(current_sg);
 326
 327                 /*
 328                  * If this scatter list entry is the last one or
 329                  * max length, terminate link.
 330                  */
 331                 if (sg_len - 1 == i || ((i+1) % max_len == 0)) {
 332                         next_lli_off_src = 0;
 333                         next_lli_off_dst = 0;
 334                 } else {
 335                         if (next_lli_off_dst == 0 &&
 336                             next_lli_off_src == 0) {
 337                                 /* The first lli will be at next_lli_off */
 338                                 next_lli_off_dst = (lcla->dst_id *
 339                                                     llis_per_log + 1);
 340                                 next_lli_off_src = (lcla->src_id *
 341                                                     llis_per_log + 1);
 342                         } else {
 343                                 next_lli_off_dst++;
 344                                 next_lli_off_src++;
 345                         }
 346                 }
 347
 348                 if (direction == DMA_TO_DEVICE) {
 349                         d40_log_fill_lli(&lli->src[i],
 350                                          sg_phys(current_sg),
 351                                          sg_dma_len(current_sg),
 352                                          next_lli_off_src,
 353                                          lcsp->lcsp1, src_data_width,
 354                                          term_int && !next_lli_off_src,
 355                                          true);
 356                         d40_log_fill_lli(&lli->dst[i],
 357                                          dev_addr,
 358                                          sg_dma_len(current_sg),
 359                                          next_lli_off_dst,
 360                                          lcsp->lcsp3, dst_data_width,
 361                                          /* No next == terminal interrupt */
 362                                          term_int && !next_lli_off_dst,
 363                                          false);
 364                 } else {
 365                         d40_log_fill_lli(&lli->dst[i],
 366                                          sg_phys(current_sg),
 367                                          sg_dma_len(current_sg),
 368                                          next_lli_off_dst,
 369                                          lcsp->lcsp3, dst_data_width,
 370                                          /* No next == terminal interrupt */
 371                                          term_int && !next_lli_off_dst,
 372                                          true);
 373                         d40_log_fill_lli(&lli->src[i],
 374                                          dev_addr,
 375                                          sg_dma_len(current_sg),
 376                                          next_lli_off_src,
 377                                          lcsp->lcsp1, src_data_width,
 378                                          term_int && !next_lli_off_src,
 379                                          false);
 380                 }
 381         }
 382         return total_size;
 383 }
 384
 385 int d40_log_sg_to_lli(int lcla_id,
 386                       struct scatterlist *sg,
 387                       int sg_len,
 388                       struct d40_log_lli *lli_sg,
 389                       u32 lcsp13, /* src or dst*/
 390                       u32 data_width,
 391                       bool term_int, int max_len, int llis_per_log)
 392 {
 393         int total_size = 0;
 394         struct scatterlist *current_sg = sg;
 395         int i;
 396         u32 next_lli_off = 0;
 397
 398         for_each_sg(sg, current_sg, sg_len, i) {
 399                 total_size += sg_dma_len(current_sg);
 400
 401                 /*
 402                  * If this scatter list entry is the last one or
 403                  * max length, terminate link.
 404                  */
 405                 if (sg_len - 1 == i || ((i+1) % max_len == 0))
 406                         next_lli_off = 0;
 407                 else {
 408                         if (next_lli_off == 0)
 409                                 /* The first lli will be at next_lli_off */
 410                                 next_lli_off = lcla_id * llis_per_log + 1;
 411                         else
 412                                 next_lli_off++;
 413                 }
 414
 415                 d40_log_fill_lli(&lli_sg[i],
 416                                  sg_phys(current_sg),
 417                                  sg_dma_len(current_sg),
 418                                  next_lli_off,
 419                                  lcsp13, data_width,
 420                                  term_int && !next_lli_off,
 421                                  true);
 422         }
 423         return total_size;
 424 }
 425
 426 void d40_log_lli_write(struct d40_log_lli_full *lcpa,
 427                        struct d40_log_lli *lcla_src,
 428                        struct d40_log_lli *lcla_dst,
 429                        struct d40_log_lli *lli_dst,
 430                        struct d40_log_lli *lli_src,
 431                        int llis_per_log)
 432 {
 433         u32 slos = 0;
 434         u32 dlos = 0;
 435         int i;
 436
 437         lcpa->lcsp0 = lli_src->lcsp02;
 438         lcpa->lcsp1 = lli_src->lcsp13;
 439         lcpa->lcsp2 = lli_dst->lcsp02;
 440         lcpa->lcsp3 = lli_dst->lcsp13;
 441
 442         slos = lli_src->lcsp13 & D40_MEM_LCSP1_SLOS_MASK;
 443         dlos = lli_dst->lcsp13 & D40_MEM_LCSP3_DLOS_MASK;
 444
 445         for (i = 0; (i < llis_per_log) && slos && dlos; i++) {
 446                 writel(lli_src[i+1].lcsp02, &lcla_src[i].lcsp02);
 447                 writel(lli_src[i+1].lcsp13, &lcla_src[i].lcsp13);
 448                 writel(lli_dst[i+1].lcsp02, &lcla_dst[i].lcsp02);
 449                 writel(lli_dst[i+1].lcsp13, &lcla_dst[i].lcsp13);
 450
 451                 slos = lli_src[i+1].lcsp13 & D40_MEM_LCSP1_SLOS_MASK;
 452                 dlos = lli_dst[i+1].lcsp13 & D40_MEM_LCSP3_DLOS_MASK;
 453         }
 454 }