linux/drivers/dma/ste_dma40_ll.c
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   1/*
   2 * Copyright (C) ST-Ericsson SA 2007-2010
   3 * Author: Per Forlin <per.forlin@stericsson.com> for ST-Ericsson
   4 * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
   5 * License terms: GNU General Public License (GPL) version 2
   6 */
   7
   8#include <linux/kernel.h>
   9#include <linux/platform_data/dma-ste-dma40.h>
  10
  11#include "ste_dma40_ll.h"
  12
  13u8 d40_width_to_bits(enum dma_slave_buswidth width)
  14{
  15        if (width == DMA_SLAVE_BUSWIDTH_1_BYTE)
  16                return STEDMA40_ESIZE_8_BIT;
  17        else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
  18                return STEDMA40_ESIZE_16_BIT;
  19        else if (width == DMA_SLAVE_BUSWIDTH_8_BYTES)
  20                return STEDMA40_ESIZE_64_BIT;
  21        else
  22                return STEDMA40_ESIZE_32_BIT;
  23}
  24
  25/* Sets up proper LCSP1 and LCSP3 register for a logical channel */
  26void d40_log_cfg(struct stedma40_chan_cfg *cfg,
  27                 u32 *lcsp1, u32 *lcsp3)
  28{
  29        u32 l3 = 0; /* dst */
  30        u32 l1 = 0; /* src */
  31
  32        /* src is mem? -> increase address pos */
  33        if (cfg->dir ==  DMA_MEM_TO_DEV ||
  34            cfg->dir ==  DMA_MEM_TO_MEM)
  35                l1 |= BIT(D40_MEM_LCSP1_SCFG_INCR_POS);
  36
  37        /* dst is mem? -> increase address pos */
  38        if (cfg->dir ==  DMA_DEV_TO_MEM ||
  39            cfg->dir ==  DMA_MEM_TO_MEM)
  40                l3 |= BIT(D40_MEM_LCSP3_DCFG_INCR_POS);
  41
  42        /* src is hw? -> master port 1 */
  43        if (cfg->dir ==  DMA_DEV_TO_MEM ||
  44            cfg->dir ==  DMA_DEV_TO_DEV)
  45                l1 |= BIT(D40_MEM_LCSP1_SCFG_MST_POS);
  46
  47        /* dst is hw? -> master port 1 */
  48        if (cfg->dir ==  DMA_MEM_TO_DEV ||
  49            cfg->dir ==  DMA_DEV_TO_DEV)
  50                l3 |= BIT(D40_MEM_LCSP3_DCFG_MST_POS);
  51
  52        l3 |= BIT(D40_MEM_LCSP3_DCFG_EIM_POS);
  53        l3 |= cfg->dst_info.psize << D40_MEM_LCSP3_DCFG_PSIZE_POS;
  54        l3 |= d40_width_to_bits(cfg->dst_info.data_width)
  55                << D40_MEM_LCSP3_DCFG_ESIZE_POS;
  56
  57        l1 |= BIT(D40_MEM_LCSP1_SCFG_EIM_POS);
  58        l1 |= cfg->src_info.psize << D40_MEM_LCSP1_SCFG_PSIZE_POS;
  59        l1 |= d40_width_to_bits(cfg->src_info.data_width)
  60                << D40_MEM_LCSP1_SCFG_ESIZE_POS;
  61
  62        *lcsp1 = l1;
  63        *lcsp3 = l3;
  64
  65}
  66
  67void d40_phy_cfg(struct stedma40_chan_cfg *cfg, u32 *src_cfg, u32 *dst_cfg)
  68{
  69        u32 src = 0;
  70        u32 dst = 0;
  71
  72        if ((cfg->dir == DMA_DEV_TO_MEM) ||
  73            (cfg->dir == DMA_DEV_TO_DEV)) {
  74                /* Set master port to 1 */
  75                src |= BIT(D40_SREG_CFG_MST_POS);
  76                src |= D40_TYPE_TO_EVENT(cfg->dev_type);
  77
  78                if (cfg->src_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
  79                        src |= BIT(D40_SREG_CFG_PHY_TM_POS);
  80                else
  81                        src |= 3 << D40_SREG_CFG_PHY_TM_POS;
  82        }
  83        if ((cfg->dir == DMA_MEM_TO_DEV) ||
  84            (cfg->dir == DMA_DEV_TO_DEV)) {
  85                /* Set master port to 1 */
  86                dst |= BIT(D40_SREG_CFG_MST_POS);
  87                dst |= D40_TYPE_TO_EVENT(cfg->dev_type);
  88
  89                if (cfg->dst_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
  90                        dst |= BIT(D40_SREG_CFG_PHY_TM_POS);
  91                else
  92                        dst |= 3 << D40_SREG_CFG_PHY_TM_POS;
  93        }
  94        /* Interrupt on end of transfer for destination */
  95        dst |= BIT(D40_SREG_CFG_TIM_POS);
  96
  97        /* Generate interrupt on error */
  98        src |= BIT(D40_SREG_CFG_EIM_POS);
  99        dst |= BIT(D40_SREG_CFG_EIM_POS);
 100
 101        /* PSIZE */
 102        if (cfg->src_info.psize != STEDMA40_PSIZE_PHY_1) {
 103                src |= BIT(D40_SREG_CFG_PHY_PEN_POS);
 104                src |= cfg->src_info.psize << D40_SREG_CFG_PSIZE_POS;
 105        }
 106        if (cfg->dst_info.psize != STEDMA40_PSIZE_PHY_1) {
 107                dst |= BIT(D40_SREG_CFG_PHY_PEN_POS);
 108                dst |= cfg->dst_info.psize << D40_SREG_CFG_PSIZE_POS;
 109        }
 110
 111        /* Element size */
 112        src |= d40_width_to_bits(cfg->src_info.data_width)
 113                << D40_SREG_CFG_ESIZE_POS;
 114        dst |= d40_width_to_bits(cfg->dst_info.data_width)
 115                << D40_SREG_CFG_ESIZE_POS;
 116
 117        /* Set the priority bit to high for the physical channel */
 118        if (cfg->high_priority) {
 119                src |= BIT(D40_SREG_CFG_PRI_POS);
 120                dst |= BIT(D40_SREG_CFG_PRI_POS);
 121        }
 122
 123        if (cfg->src_info.big_endian)
 124                src |= BIT(D40_SREG_CFG_LBE_POS);
 125        if (cfg->dst_info.big_endian)
 126                dst |= BIT(D40_SREG_CFG_LBE_POS);
 127
 128        *src_cfg = src;
 129        *dst_cfg = dst;
 130}
 131
 132static int d40_phy_fill_lli(struct d40_phy_lli *lli,
 133                            dma_addr_t data,
 134                            u32 data_size,
 135                            dma_addr_t next_lli,
 136                            u32 reg_cfg,
 137                            struct stedma40_half_channel_info *info,
 138                            unsigned int flags)
 139{
 140        bool addr_inc = flags & LLI_ADDR_INC;
 141        bool term_int = flags & LLI_TERM_INT;
 142        unsigned int data_width = info->data_width;
 143        int psize = info->psize;
 144        int num_elems;
 145
 146        if (psize == STEDMA40_PSIZE_PHY_1)
 147                num_elems = 1;
 148        else
 149                num_elems = 2 << psize;
 150
 151        /* Must be aligned */
 152        if (!IS_ALIGNED(data, data_width))
 153                return -EINVAL;
 154
 155        /* Transfer size can't be smaller than (num_elms * elem_size) */
 156        if (data_size < num_elems * data_width)
 157                return -EINVAL;
 158
 159        /* The number of elements. IE now many chunks */
 160        lli->reg_elt = (data_size / data_width) << D40_SREG_ELEM_PHY_ECNT_POS;
 161
 162        /*
 163         * Distance to next element sized entry.
 164         * Usually the size of the element unless you want gaps.
 165         */
 166        if (addr_inc)
 167                lli->reg_elt |= data_width << D40_SREG_ELEM_PHY_EIDX_POS;
 168
 169        /* Where the data is */
 170        lli->reg_ptr = data;
 171        lli->reg_cfg = reg_cfg;
 172
 173        /* If this scatter list entry is the last one, no next link */
 174        if (next_lli == 0)
 175                lli->reg_lnk = BIT(D40_SREG_LNK_PHY_TCP_POS);
 176        else
 177                lli->reg_lnk = next_lli;
 178
 179        /* Set/clear interrupt generation on this link item.*/
 180        if (term_int)
 181                lli->reg_cfg |= BIT(D40_SREG_CFG_TIM_POS);
 182        else
 183                lli->reg_cfg &= ~BIT(D40_SREG_CFG_TIM_POS);
 184
 185        /*
 186         * Post link - D40_SREG_LNK_PHY_PRE_POS = 0
 187         * Relink happens after transfer completion.
 188         */
 189
 190        return 0;
 191}
 192
 193static int d40_seg_size(int size, int data_width1, int data_width2)
 194{
 195        u32 max_w = max(data_width1, data_width2);
 196        u32 min_w = min(data_width1, data_width2);
 197        u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE * min_w, max_w);
 198
 199        if (seg_max > STEDMA40_MAX_SEG_SIZE)
 200                seg_max -= max_w;
 201
 202        if (size <= seg_max)
 203                return size;
 204
 205        if (size <= 2 * seg_max)
 206                return ALIGN(size / 2, max_w);
 207
 208        return seg_max;
 209}
 210
 211static struct d40_phy_lli *
 212d40_phy_buf_to_lli(struct d40_phy_lli *lli, dma_addr_t addr, u32 size,
 213                   dma_addr_t lli_phys, dma_addr_t first_phys, u32 reg_cfg,
 214                   struct stedma40_half_channel_info *info,
 215                   struct stedma40_half_channel_info *otherinfo,
 216                   unsigned long flags)
 217{
 218        bool lastlink = flags & LLI_LAST_LINK;
 219        bool addr_inc = flags & LLI_ADDR_INC;
 220        bool term_int = flags & LLI_TERM_INT;
 221        bool cyclic = flags & LLI_CYCLIC;
 222        int err;
 223        dma_addr_t next = lli_phys;
 224        int size_rest = size;
 225        int size_seg = 0;
 226
 227        /*
 228         * This piece may be split up based on d40_seg_size(); we only want the
 229         * term int on the last part.
 230         */
 231        if (term_int)
 232                flags &= ~LLI_TERM_INT;
 233
 234        do {
 235                size_seg = d40_seg_size(size_rest, info->data_width,
 236                                        otherinfo->data_width);
 237                size_rest -= size_seg;
 238
 239                if (size_rest == 0 && term_int)
 240                        flags |= LLI_TERM_INT;
 241
 242                if (size_rest == 0 && lastlink)
 243                        next = cyclic ? first_phys : 0;
 244                else
 245                        next = ALIGN(next + sizeof(struct d40_phy_lli),
 246                                     D40_LLI_ALIGN);
 247
 248                err = d40_phy_fill_lli(lli, addr, size_seg, next,
 249                                       reg_cfg, info, flags);
 250
 251                if (err)
 252                        goto err;
 253
 254                lli++;
 255                if (addr_inc)
 256                        addr += size_seg;
 257        } while (size_rest);
 258
 259        return lli;
 260
 261err:
 262        return NULL;
 263}
 264
 265int d40_phy_sg_to_lli(struct scatterlist *sg,
 266                      int sg_len,
 267                      dma_addr_t target,
 268                      struct d40_phy_lli *lli_sg,
 269                      dma_addr_t lli_phys,
 270                      u32 reg_cfg,
 271                      struct stedma40_half_channel_info *info,
 272                      struct stedma40_half_channel_info *otherinfo,
 273                      unsigned long flags)
 274{
 275        int total_size = 0;
 276        int i;
 277        struct scatterlist *current_sg = sg;
 278        struct d40_phy_lli *lli = lli_sg;
 279        dma_addr_t l_phys = lli_phys;
 280
 281        if (!target)
 282                flags |= LLI_ADDR_INC;
 283
 284        for_each_sg(sg, current_sg, sg_len, i) {
 285                dma_addr_t sg_addr = sg_dma_address(current_sg);
 286                unsigned int len = sg_dma_len(current_sg);
 287                dma_addr_t dst = target ?: sg_addr;
 288
 289                total_size += sg_dma_len(current_sg);
 290
 291                if (i == sg_len - 1)
 292                        flags |= LLI_TERM_INT | LLI_LAST_LINK;
 293
 294                l_phys = ALIGN(lli_phys + (lli - lli_sg) *
 295                               sizeof(struct d40_phy_lli), D40_LLI_ALIGN);
 296
 297                lli = d40_phy_buf_to_lli(lli, dst, len, l_phys, lli_phys,
 298                                         reg_cfg, info, otherinfo, flags);
 299
 300                if (lli == NULL)
 301                        return -EINVAL;
 302        }
 303
 304        return total_size;
 305}
 306
 307
 308/* DMA logical lli operations */
 309
 310static void d40_log_lli_link(struct d40_log_lli *lli_dst,
 311                             struct d40_log_lli *lli_src,
 312                             int next, unsigned int flags)
 313{
 314        bool interrupt = flags & LLI_TERM_INT;
 315        u32 slos = 0;
 316        u32 dlos = 0;
 317
 318        if (next != -EINVAL) {
 319                slos = next * 2;
 320                dlos = next * 2 + 1;
 321        }
 322
 323        if (interrupt) {
 324                lli_dst->lcsp13 |= D40_MEM_LCSP1_SCFG_TIM_MASK;
 325                lli_dst->lcsp13 |= D40_MEM_LCSP3_DTCP_MASK;
 326        }
 327
 328        lli_src->lcsp13 = (lli_src->lcsp13 & ~D40_MEM_LCSP1_SLOS_MASK) |
 329                (slos << D40_MEM_LCSP1_SLOS_POS);
 330
 331        lli_dst->lcsp13 = (lli_dst->lcsp13 & ~D40_MEM_LCSP1_SLOS_MASK) |
 332                (dlos << D40_MEM_LCSP1_SLOS_POS);
 333}
 334
 335void d40_log_lli_lcpa_write(struct d40_log_lli_full *lcpa,
 336                           struct d40_log_lli *lli_dst,
 337                           struct d40_log_lli *lli_src,
 338                           int next, unsigned int flags)
 339{
 340        d40_log_lli_link(lli_dst, lli_src, next, flags);
 341
 342        writel_relaxed(lli_src->lcsp02, &lcpa[0].lcsp0);
 343        writel_relaxed(lli_src->lcsp13, &lcpa[0].lcsp1);
 344        writel_relaxed(lli_dst->lcsp02, &lcpa[0].lcsp2);
 345        writel_relaxed(lli_dst->lcsp13, &lcpa[0].lcsp3);
 346}
 347
 348void d40_log_lli_lcla_write(struct d40_log_lli *lcla,
 349                           struct d40_log_lli *lli_dst,
 350                           struct d40_log_lli *lli_src,
 351                           int next, unsigned int flags)
 352{
 353        d40_log_lli_link(lli_dst, lli_src, next, flags);
 354
 355        writel_relaxed(lli_src->lcsp02, &lcla[0].lcsp02);
 356        writel_relaxed(lli_src->lcsp13, &lcla[0].lcsp13);
 357        writel_relaxed(lli_dst->lcsp02, &lcla[1].lcsp02);
 358        writel_relaxed(lli_dst->lcsp13, &lcla[1].lcsp13);
 359}
 360
 361static void d40_log_fill_lli(struct d40_log_lli *lli,
 362                             dma_addr_t data, u32 data_size,
 363                             u32 reg_cfg,
 364                             u32 data_width,
 365                             unsigned int flags)
 366{
 367        bool addr_inc = flags & LLI_ADDR_INC;
 368
 369        lli->lcsp13 = reg_cfg;
 370
 371        /* The number of elements to transfer */
 372        lli->lcsp02 = ((data_size / data_width) <<
 373                       D40_MEM_LCSP0_ECNT_POS) & D40_MEM_LCSP0_ECNT_MASK;
 374
 375        BUG_ON((data_size / data_width) > STEDMA40_MAX_SEG_SIZE);
 376
 377        /* 16 LSBs address of the current element */
 378        lli->lcsp02 |= data & D40_MEM_LCSP0_SPTR_MASK;
 379        /* 16 MSBs address of the current element */
 380        lli->lcsp13 |= data & D40_MEM_LCSP1_SPTR_MASK;
 381
 382        if (addr_inc)
 383                lli->lcsp13 |= D40_MEM_LCSP1_SCFG_INCR_MASK;
 384
 385}
 386
 387static struct d40_log_lli *d40_log_buf_to_lli(struct d40_log_lli *lli_sg,
 388                                       dma_addr_t addr,
 389                                       int size,
 390                                       u32 lcsp13, /* src or dst*/
 391                                       u32 data_width1,
 392                                       u32 data_width2,
 393                                       unsigned int flags)
 394{
 395        bool addr_inc = flags & LLI_ADDR_INC;
 396        struct d40_log_lli *lli = lli_sg;
 397        int size_rest = size;
 398        int size_seg = 0;
 399
 400        do {
 401                size_seg = d40_seg_size(size_rest, data_width1, data_width2);
 402                size_rest -= size_seg;
 403
 404                d40_log_fill_lli(lli,
 405                                 addr,
 406                                 size_seg,
 407                                 lcsp13, data_width1,
 408                                 flags);
 409                if (addr_inc)
 410                        addr += size_seg;
 411                lli++;
 412        } while (size_rest);
 413
 414        return lli;
 415}
 416
 417int d40_log_sg_to_lli(struct scatterlist *sg,
 418                      int sg_len,
 419                      dma_addr_t dev_addr,
 420                      struct d40_log_lli *lli_sg,
 421                      u32 lcsp13, /* src or dst*/
 422                      u32 data_width1, u32 data_width2)
 423{
 424        int total_size = 0;
 425        struct scatterlist *current_sg = sg;
 426        int i;
 427        struct d40_log_lli *lli = lli_sg;
 428        unsigned long flags = 0;
 429
 430        if (!dev_addr)
 431                flags |= LLI_ADDR_INC;
 432
 433        for_each_sg(sg, current_sg, sg_len, i) {
 434                dma_addr_t sg_addr = sg_dma_address(current_sg);
 435                unsigned int len = sg_dma_len(current_sg);
 436                dma_addr_t addr = dev_addr ?: sg_addr;
 437
 438                total_size += sg_dma_len(current_sg);
 439
 440                lli = d40_log_buf_to_lli(lli, addr, len,
 441                                         lcsp13,
 442                                         data_width1,
 443                                         data_width2,
 444                                         flags);
 445        }
 446
 447        return total_size;
 448}
 449
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