drivers/dma/omap-dma.c

   1 /*
   2  * OMAP DMAengine support
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #include <linux/delay.h>
   9 #include <linux/dmaengine.h>
  10 #include <linux/dma-mapping.h>
  11 #include <linux/dmapool.h>
  12 #include <linux/err.h>
  13 #include <linux/init.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/list.h>
  16 #include <linux/module.h>
  17 #include <linux/omap-dma.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/slab.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/of_dma.h>
  22 #include <linux/of_device.h>
  23
  24 #include "virt-dma.h"
  25
  26 #define OMAP_SDMA_REQUESTS      127
  27 #define OMAP_SDMA_CHANNELS      32
  28
  29 struct omap_dmadev {
  30         struct dma_device ddev;
  31         spinlock_t lock;
  32         void __iomem *base;
  33         const struct omap_dma_reg *reg_map;
  34         struct omap_system_dma_plat_info *plat;
  35         bool legacy;
  36         bool ll123_supported;
  37         struct dma_pool *desc_pool;
  38         unsigned dma_requests;
  39         spinlock_t irq_lock;
  40         uint32_t irq_enable_mask;
  41         struct omap_chan **lch_map;
  42 };
  43
  44 struct omap_chan {
  45         struct virt_dma_chan vc;
  46         void __iomem *channel_base;
  47         const struct omap_dma_reg *reg_map;
  48         uint32_t ccr;
  49
  50         struct dma_slave_config cfg;
  51         unsigned dma_sig;
  52         bool cyclic;
  53         bool paused;
  54         bool running;
  55
  56         int dma_ch;
  57         struct omap_desc *desc;
  58         unsigned sgidx;
  59 };
  60
  61 #define DESC_NXT_SV_REFRESH     (0x1 << 24)
  62 #define DESC_NXT_SV_REUSE       (0x2 << 24)
  63 #define DESC_NXT_DV_REFRESH     (0x1 << 26)
  64 #define DESC_NXT_DV_REUSE       (0x2 << 26)
  65 #define DESC_NTYPE_TYPE2        (0x2 << 29)
  66
  67 /* Type 2 descriptor with Source or Destination address update */
  68 struct omap_type2_desc {
  69         uint32_t next_desc;
  70         uint32_t en;
  71         uint32_t addr; /* src or dst */
  72         uint16_t fn;
  73         uint16_t cicr;
  74         int16_t cdei;
  75         int16_t csei;
  76         int32_t cdfi;
  77         int32_t csfi;
  78 } __packed;
  79
  80 struct omap_sg {
  81         dma_addr_t addr;
  82         uint32_t en;            /* number of elements (24-bit) */
  83         uint32_t fn;            /* number of frames (16-bit) */
  84         int32_t fi;             /* for double indexing */
  85         int16_t ei;             /* for double indexing */
  86
  87         /* Linked list */
  88         struct omap_type2_desc *t2_desc;
  89         dma_addr_t t2_desc_paddr;
  90 };
  91
  92 struct omap_desc {
  93         struct virt_dma_desc vd;
  94         bool using_ll;
  95         enum dma_transfer_direction dir;
  96         dma_addr_t dev_addr;
  97
  98         int32_t fi;             /* for OMAP_DMA_SYNC_PACKET / double indexing */
  99         int16_t ei;             /* for double indexing */
 100         uint8_t es;             /* CSDP_DATA_TYPE_xxx */
 101         uint32_t ccr;           /* CCR value */
 102         uint16_t clnk_ctrl;     /* CLNK_CTRL value */
 103         uint16_t cicr;          /* CICR value */
 104         uint32_t csdp;          /* CSDP value */
 105
 106         unsigned sglen;
 107         struct omap_sg sg[0];
 108 };
 109
 110 enum {
 111         CAPS_0_SUPPORT_LL123    = BIT(20),      /* Linked List type1/2/3 */
 112         CAPS_0_SUPPORT_LL4      = BIT(21),      /* Linked List type4 */
 113
 114         CCR_FS                  = BIT(5),
 115         CCR_READ_PRIORITY       = BIT(6),
 116         CCR_ENABLE              = BIT(7),
 117         CCR_AUTO_INIT           = BIT(8),       /* OMAP1 only */
 118         CCR_REPEAT              = BIT(9),       /* OMAP1 only */
 119         CCR_OMAP31_DISABLE      = BIT(10),      /* OMAP1 only */
 120         CCR_SUSPEND_SENSITIVE   = BIT(8),       /* OMAP2+ only */
 121         CCR_RD_ACTIVE           = BIT(9),       /* OMAP2+ only */
 122         CCR_WR_ACTIVE           = BIT(10),      /* OMAP2+ only */
 123         CCR_SRC_AMODE_CONSTANT  = 0 << 12,
 124         CCR_SRC_AMODE_POSTINC   = 1 << 12,
 125         CCR_SRC_AMODE_SGLIDX    = 2 << 12,
 126         CCR_SRC_AMODE_DBLIDX    = 3 << 12,
 127         CCR_DST_AMODE_CONSTANT  = 0 << 14,
 128         CCR_DST_AMODE_POSTINC   = 1 << 14,
 129         CCR_DST_AMODE_SGLIDX    = 2 << 14,
 130         CCR_DST_AMODE_DBLIDX    = 3 << 14,
 131         CCR_CONSTANT_FILL       = BIT(16),
 132         CCR_TRANSPARENT_COPY    = BIT(17),
 133         CCR_BS                  = BIT(18),
 134         CCR_SUPERVISOR          = BIT(22),
 135         CCR_PREFETCH            = BIT(23),
 136         CCR_TRIGGER_SRC         = BIT(24),
 137         CCR_BUFFERING_DISABLE   = BIT(25),
 138         CCR_WRITE_PRIORITY      = BIT(26),
 139         CCR_SYNC_ELEMENT        = 0,
 140         CCR_SYNC_FRAME          = CCR_FS,
 141         CCR_SYNC_BLOCK          = CCR_BS,
 142         CCR_SYNC_PACKET         = CCR_BS | CCR_FS,
 143
 144         CSDP_DATA_TYPE_8        = 0,
 145         CSDP_DATA_TYPE_16       = 1,
 146         CSDP_DATA_TYPE_32       = 2,
 147         CSDP_SRC_PORT_EMIFF     = 0 << 2, /* OMAP1 only */
 148         CSDP_SRC_PORT_EMIFS     = 1 << 2, /* OMAP1 only */
 149         CSDP_SRC_PORT_OCP_T1    = 2 << 2, /* OMAP1 only */
 150         CSDP_SRC_PORT_TIPB      = 3 << 2, /* OMAP1 only */
 151         CSDP_SRC_PORT_OCP_T2    = 4 << 2, /* OMAP1 only */
 152         CSDP_SRC_PORT_MPUI      = 5 << 2, /* OMAP1 only */
 153         CSDP_SRC_PACKED         = BIT(6),
 154         CSDP_SRC_BURST_1        = 0 << 7,
 155         CSDP_SRC_BURST_16       = 1 << 7,
 156         CSDP_SRC_BURST_32       = 2 << 7,
 157         CSDP_SRC_BURST_64       = 3 << 7,
 158         CSDP_DST_PORT_EMIFF     = 0 << 9, /* OMAP1 only */
 159         CSDP_DST_PORT_EMIFS     = 1 << 9, /* OMAP1 only */
 160         CSDP_DST_PORT_OCP_T1    = 2 << 9, /* OMAP1 only */
 161         CSDP_DST_PORT_TIPB      = 3 << 9, /* OMAP1 only */
 162         CSDP_DST_PORT_OCP_T2    = 4 << 9, /* OMAP1 only */
 163         CSDP_DST_PORT_MPUI      = 5 << 9, /* OMAP1 only */
 164         CSDP_DST_PACKED         = BIT(13),
 165         CSDP_DST_BURST_1        = 0 << 14,
 166         CSDP_DST_BURST_16       = 1 << 14,
 167         CSDP_DST_BURST_32       = 2 << 14,
 168         CSDP_DST_BURST_64       = 3 << 14,
 169         CSDP_WRITE_NON_POSTED   = 0 << 16,
 170         CSDP_WRITE_POSTED       = 1 << 16,
 171         CSDP_WRITE_LAST_NON_POSTED = 2 << 16,
 172
 173         CICR_TOUT_IE            = BIT(0),       /* OMAP1 only */
 174         CICR_DROP_IE            = BIT(1),
 175         CICR_HALF_IE            = BIT(2),
 176         CICR_FRAME_IE           = BIT(3),
 177         CICR_LAST_IE            = BIT(4),
 178         CICR_BLOCK_IE           = BIT(5),
 179         CICR_PKT_IE             = BIT(7),       /* OMAP2+ only */
 180         CICR_TRANS_ERR_IE       = BIT(8),       /* OMAP2+ only */
 181         CICR_SUPERVISOR_ERR_IE  = BIT(10),      /* OMAP2+ only */
 182         CICR_MISALIGNED_ERR_IE  = BIT(11),      /* OMAP2+ only */
 183         CICR_DRAIN_IE           = BIT(12),      /* OMAP2+ only */
 184         CICR_SUPER_BLOCK_IE     = BIT(14),      /* OMAP2+ only */
 185
 186         CLNK_CTRL_ENABLE_LNK    = BIT(15),
 187
 188         CDP_DST_VALID_INC       = 0 << 0,
 189         CDP_DST_VALID_RELOAD    = 1 << 0,
 190         CDP_DST_VALID_REUSE     = 2 << 0,
 191         CDP_SRC_VALID_INC       = 0 << 2,
 192         CDP_SRC_VALID_RELOAD    = 1 << 2,
 193         CDP_SRC_VALID_REUSE     = 2 << 2,
 194         CDP_NTYPE_TYPE1         = 1 << 4,
 195         CDP_NTYPE_TYPE2         = 2 << 4,
 196         CDP_NTYPE_TYPE3         = 3 << 4,
 197         CDP_TMODE_NORMAL        = 0 << 8,
 198         CDP_TMODE_LLIST         = 1 << 8,
 199         CDP_FAST                = BIT(10),
 200 };
 201
 202 static const unsigned es_bytes[] = {
 203         [CSDP_DATA_TYPE_8] = 1,
 204         [CSDP_DATA_TYPE_16] = 2,
 205         [CSDP_DATA_TYPE_32] = 4,
 206 };
 207
 208 static struct of_dma_filter_info omap_dma_info = {
 209         .filter_fn = omap_dma_filter_fn,
 210 };
 211
 212 static inline struct omap_dmadev *to_omap_dma_dev(struct dma_device *d)
 213 {
 214         return container_of(d, struct omap_dmadev, ddev);
 215 }
 216
 217 static inline struct omap_chan *to_omap_dma_chan(struct dma_chan *c)
 218 {
 219         return container_of(c, struct omap_chan, vc.chan);
 220 }
 221
 222 static inline struct omap_desc *to_omap_dma_desc(struct dma_async_tx_descriptor *t)
 223 {
 224         return container_of(t, struct omap_desc, vd.tx);
 225 }
 226
 227 static void omap_dma_desc_free(struct virt_dma_desc *vd)
 228 {
 229         struct omap_desc *d = to_omap_dma_desc(&vd->tx);
 230
 231         if (d->using_ll) {
 232                 struct omap_dmadev *od = to_omap_dma_dev(vd->tx.chan->device);
 233                 int i;
 234
 235                 for (i = 0; i < d->sglen; i++) {
 236                         if (d->sg[i].t2_desc)
 237                                 dma_pool_free(od->desc_pool, d->sg[i].t2_desc,
 238                                               d->sg[i].t2_desc_paddr);
 239                 }
 240         }
 241
 242         kfree(d);
 243 }
 244
 245 static void omap_dma_fill_type2_desc(struct omap_desc *d, int idx,
 246                                      enum dma_transfer_direction dir, bool last)
 247 {
 248         struct omap_sg *sg = &d->sg[idx];
 249         struct omap_type2_desc *t2_desc = sg->t2_desc;
 250
 251         if (idx)
 252                 d->sg[idx - 1].t2_desc->next_desc = sg->t2_desc_paddr;
 253         if (last)
 254                 t2_desc->next_desc = 0xfffffffc;
 255
 256         t2_desc->en = sg->en;
 257         t2_desc->addr = sg->addr;
 258         t2_desc->fn = sg->fn & 0xffff;
 259         t2_desc->cicr = d->cicr;
 260         if (!last)
 261                 t2_desc->cicr &= ~CICR_BLOCK_IE;
 262
 263         switch (dir) {
 264         case DMA_DEV_TO_MEM:
 265                 t2_desc->cdei = sg->ei;
 266                 t2_desc->csei = d->ei;
 267                 t2_desc->cdfi = sg->fi;
 268                 t2_desc->csfi = d->fi;
 269
 270                 t2_desc->en |= DESC_NXT_DV_REFRESH;
 271                 t2_desc->en |= DESC_NXT_SV_REUSE;
 272                 break;
 273         case DMA_MEM_TO_DEV:
 274                 t2_desc->cdei = d->ei;
 275                 t2_desc->csei = sg->ei;
 276                 t2_desc->cdfi = d->fi;
 277                 t2_desc->csfi = sg->fi;
 278
 279                 t2_desc->en |= DESC_NXT_SV_REFRESH;
 280                 t2_desc->en |= DESC_NXT_DV_REUSE;
 281                 break;
 282         default:
 283                 return;
 284         }
 285
 286         t2_desc->en |= DESC_NTYPE_TYPE2;
 287 }
 288
 289 static void omap_dma_write(uint32_t val, unsigned type, void __iomem *addr)
 290 {
 291         switch (type) {
 292         case OMAP_DMA_REG_16BIT:
 293                 writew_relaxed(val, addr);
 294                 break;
 295         case OMAP_DMA_REG_2X16BIT:
 296                 writew_relaxed(val, addr);
 297                 writew_relaxed(val >> 16, addr + 2);
 298                 break;
 299         case OMAP_DMA_REG_32BIT:
 300                 writel_relaxed(val, addr);
 301                 break;
 302         default:
 303                 WARN_ON(1);
 304         }
 305 }
 306
 307 static unsigned omap_dma_read(unsigned type, void __iomem *addr)
 308 {
 309         unsigned val;
 310
 311         switch (type) {
 312         case OMAP_DMA_REG_16BIT:
 313                 val = readw_relaxed(addr);
 314                 break;
 315         case OMAP_DMA_REG_2X16BIT:
 316                 val = readw_relaxed(addr);
 317                 val |= readw_relaxed(addr + 2) << 16;
 318                 break;
 319         case OMAP_DMA_REG_32BIT:
 320                 val = readl_relaxed(addr);
 321                 break;
 322         default:
 323                 WARN_ON(1);
 324                 val = 0;
 325         }
 326
 327         return val;
 328 }
 329
 330 static void omap_dma_glbl_write(struct omap_dmadev *od, unsigned reg, unsigned val)
 331 {
 332         const struct omap_dma_reg *r = od->reg_map + reg;
 333
 334         WARN_ON(r->stride);
 335
 336         omap_dma_write(val, r->type, od->base + r->offset);
 337 }
 338
 339 static unsigned omap_dma_glbl_read(struct omap_dmadev *od, unsigned reg)
 340 {
 341         const struct omap_dma_reg *r = od->reg_map + reg;
 342
 343         WARN_ON(r->stride);
 344
 345         return omap_dma_read(r->type, od->base + r->offset);
 346 }
 347
 348 static void omap_dma_chan_write(struct omap_chan *c, unsigned reg, unsigned val)
 349 {
 350         const struct omap_dma_reg *r = c->reg_map + reg;
 351
 352         omap_dma_write(val, r->type, c->channel_base + r->offset);
 353 }
 354
 355 static unsigned omap_dma_chan_read(struct omap_chan *c, unsigned reg)
 356 {
 357         const struct omap_dma_reg *r = c->reg_map + reg;
 358
 359         return omap_dma_read(r->type, c->channel_base + r->offset);
 360 }
 361
 362 static void omap_dma_clear_csr(struct omap_chan *c)
 363 {
 364         if (dma_omap1())
 365                 omap_dma_chan_read(c, CSR);
 366         else
 367                 omap_dma_chan_write(c, CSR, ~0);
 368 }
 369
 370 static unsigned omap_dma_get_csr(struct omap_chan *c)
 371 {
 372         unsigned val = omap_dma_chan_read(c, CSR);
 373
 374         if (!dma_omap1())
 375                 omap_dma_chan_write(c, CSR, val);
 376
 377         return val;
 378 }
 379
 380 static void omap_dma_assign(struct omap_dmadev *od, struct omap_chan *c,
 381         unsigned lch)
 382 {
 383         c->channel_base = od->base + od->plat->channel_stride * lch;
 384
 385         od->lch_map[lch] = c;
 386 }
 387
 388 static void omap_dma_start(struct omap_chan *c, struct omap_desc *d)
 389 {
 390         struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
 391         uint16_t cicr = d->cicr;
 392
 393         if (__dma_omap15xx(od->plat->dma_attr))
 394                 omap_dma_chan_write(c, CPC, 0);
 395         else
 396                 omap_dma_chan_write(c, CDAC, 0);
 397
 398         omap_dma_clear_csr(c);
 399
 400         if (d->using_ll) {
 401                 uint32_t cdp = CDP_TMODE_LLIST | CDP_NTYPE_TYPE2 | CDP_FAST;
 402
 403                 if (d->dir == DMA_DEV_TO_MEM)
 404                         cdp |= (CDP_DST_VALID_RELOAD | CDP_SRC_VALID_REUSE);
 405                 else
 406                         cdp |= (CDP_DST_VALID_REUSE | CDP_SRC_VALID_RELOAD);
 407                 omap_dma_chan_write(c, CDP, cdp);
 408
 409                 omap_dma_chan_write(c, CNDP, d->sg[0].t2_desc_paddr);
 410                 omap_dma_chan_write(c, CCDN, 0);
 411                 omap_dma_chan_write(c, CCFN, 0xffff);
 412                 omap_dma_chan_write(c, CCEN, 0xffffff);
 413
 414                 cicr &= ~CICR_BLOCK_IE;
 415         } else if (od->ll123_supported) {
 416                 omap_dma_chan_write(c, CDP, 0);
 417         }
 418
 419         /* Enable interrupts */
 420         omap_dma_chan_write(c, CICR, cicr);
 421
 422         /* Enable channel */
 423         omap_dma_chan_write(c, CCR, d->ccr | CCR_ENABLE);
 424
 425         c->running = true;
 426 }
 427
 428 static void omap_dma_drain_chan(struct omap_chan *c)
 429 {
 430         int i;
 431         u32 val;
 432
 433         /* Wait for sDMA FIFO to drain */
 434         for (i = 0; ; i++) {
 435                 val = omap_dma_chan_read(c, CCR);
 436                 if (!(val & (CCR_RD_ACTIVE | CCR_WR_ACTIVE)))
 437                         break;
 438
 439                 if (i > 100)
 440                         break;
 441
 442                 udelay(5);
 443         }
 444
 445         if (val & (CCR_RD_ACTIVE | CCR_WR_ACTIVE))
 446                 dev_err(c->vc.chan.device->dev,
 447                         "DMA drain did not complete on lch %d\n",
 448                         c->dma_ch);
 449 }
 450
 451 static int omap_dma_stop(struct omap_chan *c)
 452 {
 453         struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
 454         uint32_t val;
 455
 456         /* disable irq */
 457         omap_dma_chan_write(c, CICR, 0);
 458
 459         omap_dma_clear_csr(c);
 460
 461         val = omap_dma_chan_read(c, CCR);
 462         if (od->plat->errata & DMA_ERRATA_i541 && val & CCR_TRIGGER_SRC) {
 463                 uint32_t sysconfig;
 464
 465                 sysconfig = omap_dma_glbl_read(od, OCP_SYSCONFIG);
 466                 val = sysconfig & ~DMA_SYSCONFIG_MIDLEMODE_MASK;
 467                 val |= DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_NO_IDLE);
 468                 omap_dma_glbl_write(od, OCP_SYSCONFIG, val);
 469
 470                 val = omap_dma_chan_read(c, CCR);
 471                 val &= ~CCR_ENABLE;
 472                 omap_dma_chan_write(c, CCR, val);
 473
 474                 if (!(c->ccr & CCR_BUFFERING_DISABLE))
 475                         omap_dma_drain_chan(c);
 476
 477                 omap_dma_glbl_write(od, OCP_SYSCONFIG, sysconfig);
 478         } else {
 479                 if (!(val & CCR_ENABLE))
 480                         return -EINVAL;
 481
 482                 val &= ~CCR_ENABLE;
 483                 omap_dma_chan_write(c, CCR, val);
 484
 485                 if (!(c->ccr & CCR_BUFFERING_DISABLE))
 486                         omap_dma_drain_chan(c);
 487         }
 488
 489         mb();
 490
 491         if (!__dma_omap15xx(od->plat->dma_attr) && c->cyclic) {
 492                 val = omap_dma_chan_read(c, CLNK_CTRL);
 493
 494                 if (dma_omap1())
 495                         val |= 1 << 14; /* set the STOP_LNK bit */
 496                 else
 497                         val &= ~CLNK_CTRL_ENABLE_LNK;
 498
 499                 omap_dma_chan_write(c, CLNK_CTRL, val);
 500         }
 501         c->running = false;
 502         return 0;
 503 }
 504
 505 static void omap_dma_start_sg(struct omap_chan *c, struct omap_desc *d)
 506 {
 507         struct omap_sg *sg = d->sg + c->sgidx;
 508         unsigned cxsa, cxei, cxfi;
 509
 510         if (d->dir == DMA_DEV_TO_MEM || d->dir == DMA_MEM_TO_MEM) {
 511                 cxsa = CDSA;
 512                 cxei = CDEI;
 513                 cxfi = CDFI;
 514         } else {
 515                 cxsa = CSSA;
 516                 cxei = CSEI;
 517                 cxfi = CSFI;
 518         }
 519
 520         omap_dma_chan_write(c, cxsa, sg->addr);
 521         omap_dma_chan_write(c, cxei, sg->ei);
 522         omap_dma_chan_write(c, cxfi, sg->fi);
 523         omap_dma_chan_write(c, CEN, sg->en);
 524         omap_dma_chan_write(c, CFN, sg->fn);
 525
 526         omap_dma_start(c, d);
 527         c->sgidx++;
 528 }
 529
 530 static void omap_dma_start_desc(struct omap_chan *c)
 531 {
 532         struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
 533         struct omap_desc *d;
 534         unsigned cxsa, cxei, cxfi;
 535
 536         if (!vd) {
 537                 c->desc = NULL;
 538                 return;
 539         }
 540
 541         list_del(&vd->node);
 542
 543         c->desc = d = to_omap_dma_desc(&vd->tx);
 544         c->sgidx = 0;
 545
 546         /*
 547          * This provides the necessary barrier to ensure data held in
 548          * DMA coherent memory is visible to the DMA engine prior to
 549          * the transfer starting.
 550          */
 551         mb();
 552
 553         omap_dma_chan_write(c, CCR, d->ccr);
 554         if (dma_omap1())
 555                 omap_dma_chan_write(c, CCR2, d->ccr >> 16);
 556
 557         if (d->dir == DMA_DEV_TO_MEM || d->dir == DMA_MEM_TO_MEM) {
 558                 cxsa = CSSA;
 559                 cxei = CSEI;
 560                 cxfi = CSFI;
 561         } else {
 562                 cxsa = CDSA;
 563                 cxei = CDEI;
 564                 cxfi = CDFI;
 565         }
 566
 567         omap_dma_chan_write(c, cxsa, d->dev_addr);
 568         omap_dma_chan_write(c, cxei, d->ei);
 569         omap_dma_chan_write(c, cxfi, d->fi);
 570         omap_dma_chan_write(c, CSDP, d->csdp);
 571         omap_dma_chan_write(c, CLNK_CTRL, d->clnk_ctrl);
 572
 573         omap_dma_start_sg(c, d);
 574 }
 575
 576 static void omap_dma_callback(int ch, u16 status, void *data)
 577 {
 578         struct omap_chan *c = data;
 579         struct omap_desc *d;
 580         unsigned long flags;
 581
 582         spin_lock_irqsave(&c->vc.lock, flags);
 583         d = c->desc;
 584         if (d) {
 585                 if (c->cyclic) {
 586                         vchan_cyclic_callback(&d->vd);
 587                 } else if (d->using_ll || c->sgidx == d->sglen) {
 588                         omap_dma_start_desc(c);
 589                         vchan_cookie_complete(&d->vd);
 590                 } else {
 591                         omap_dma_start_sg(c, d);
 592                 }
 593         }
 594         spin_unlock_irqrestore(&c->vc.lock, flags);
 595 }
 596
 597 static irqreturn_t omap_dma_irq(int irq, void *devid)
 598 {
 599         struct omap_dmadev *od = devid;
 600         unsigned status, channel;
 601
 602         spin_lock(&od->irq_lock);
 603
 604         status = omap_dma_glbl_read(od, IRQSTATUS_L1);
 605         status &= od->irq_enable_mask;
 606         if (status == 0) {
 607                 spin_unlock(&od->irq_lock);
 608                 return IRQ_NONE;
 609         }
 610
 611         while ((channel = ffs(status)) != 0) {
 612                 unsigned mask, csr;
 613                 struct omap_chan *c;
 614
 615                 channel -= 1;
 616                 mask = BIT(channel);
 617                 status &= ~mask;
 618
 619                 c = od->lch_map[channel];
 620                 if (c == NULL) {
 621                         /* This should never happen */
 622                         dev_err(od->ddev.dev, "invalid channel %u\n", channel);
 623                         continue;
 624                 }
 625
 626                 csr = omap_dma_get_csr(c);
 627                 omap_dma_glbl_write(od, IRQSTATUS_L1, mask);
 628
 629                 omap_dma_callback(channel, csr, c);
 630         }
 631
 632         spin_unlock(&od->irq_lock);
 633
 634         return IRQ_HANDLED;
 635 }
 636
 637 static int omap_dma_alloc_chan_resources(struct dma_chan *chan)
 638 {
 639         struct omap_dmadev *od = to_omap_dma_dev(chan->device);
 640         struct omap_chan *c = to_omap_dma_chan(chan);
 641         struct device *dev = od->ddev.dev;
 642         int ret;
 643
 644         if (od->legacy) {
 645                 ret = omap_request_dma(c->dma_sig, "DMA engine",
 646                                        omap_dma_callback, c, &c->dma_ch);
 647         } else {
 648                 ret = omap_request_dma(c->dma_sig, "DMA engine", NULL, NULL,
 649                                        &c->dma_ch);
 650         }
 651
 652         dev_dbg(dev, "allocating channel %u for %u\n", c->dma_ch, c->dma_sig);
 653
 654         if (ret >= 0) {
 655                 omap_dma_assign(od, c, c->dma_ch);
 656
 657                 if (!od->legacy) {
 658                         unsigned val;
 659
 660                         spin_lock_irq(&od->irq_lock);
 661                         val = BIT(c->dma_ch);
 662                         omap_dma_glbl_write(od, IRQSTATUS_L1, val);
 663                         od->irq_enable_mask |= val;
 664                         omap_dma_glbl_write(od, IRQENABLE_L1, od->irq_enable_mask);
 665
 666                         val = omap_dma_glbl_read(od, IRQENABLE_L0);
 667                         val &= ~BIT(c->dma_ch);
 668                         omap_dma_glbl_write(od, IRQENABLE_L0, val);
 669                         spin_unlock_irq(&od->irq_lock);
 670                 }
 671         }
 672
 673         if (dma_omap1()) {
 674                 if (__dma_omap16xx(od->plat->dma_attr)) {
 675                         c->ccr = CCR_OMAP31_DISABLE;
 676                         /* Duplicate what plat-omap/dma.c does */
 677                         c->ccr |= c->dma_ch + 1;
 678                 } else {
 679                         c->ccr = c->dma_sig & 0x1f;
 680                 }
 681         } else {
 682                 c->ccr = c->dma_sig & 0x1f;
 683                 c->ccr |= (c->dma_sig & ~0x1f) << 14;
 684         }
 685         if (od->plat->errata & DMA_ERRATA_IFRAME_BUFFERING)
 686                 c->ccr |= CCR_BUFFERING_DISABLE;
 687
 688         return ret;
 689 }
 690
 691 static void omap_dma_free_chan_resources(struct dma_chan *chan)
 692 {
 693         struct omap_dmadev *od = to_omap_dma_dev(chan->device);
 694         struct omap_chan *c = to_omap_dma_chan(chan);
 695
 696         if (!od->legacy) {
 697                 spin_lock_irq(&od->irq_lock);
 698                 od->irq_enable_mask &= ~BIT(c->dma_ch);
 699                 omap_dma_glbl_write(od, IRQENABLE_L1, od->irq_enable_mask);
 700                 spin_unlock_irq(&od->irq_lock);
 701         }
 702
 703         c->channel_base = NULL;
 704         od->lch_map[c->dma_ch] = NULL;
 705         vchan_free_chan_resources(&c->vc);
 706         omap_free_dma(c->dma_ch);
 707
 708         dev_dbg(od->ddev.dev, "freeing channel %u used for %u\n", c->dma_ch,
 709                 c->dma_sig);
 710         c->dma_sig = 0;
 711 }
 712
 713 static size_t omap_dma_sg_size(struct omap_sg *sg)
 714 {
 715         return sg->en * sg->fn;
 716 }
 717
 718 static size_t omap_dma_desc_size(struct omap_desc *d)
 719 {
 720         unsigned i;
 721         size_t size;
 722
 723         for (size = i = 0; i < d->sglen; i++)
 724                 size += omap_dma_sg_size(&d->sg[i]);
 725
 726         return size * es_bytes[d->es];
 727 }
 728
 729 static size_t omap_dma_desc_size_pos(struct omap_desc *d, dma_addr_t addr)
 730 {
 731         unsigned i;
 732         size_t size, es_size = es_bytes[d->es];
 733
 734         for (size = i = 0; i < d->sglen; i++) {
 735                 size_t this_size = omap_dma_sg_size(&d->sg[i]) * es_size;
 736
 737                 if (size)
 738                         size += this_size;
 739                 else if (addr >= d->sg[i].addr &&
 740                          addr < d->sg[i].addr + this_size)
 741                         size += d->sg[i].addr + this_size - addr;
 742         }
 743         return size;
 744 }
 745
 746 /*
 747  * OMAP 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
 748  * read before the DMA controller finished disabling the channel.
 749  */
 750 static uint32_t omap_dma_chan_read_3_3(struct omap_chan *c, unsigned reg)
 751 {
 752         struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
 753         uint32_t val;
 754
 755         val = omap_dma_chan_read(c, reg);
 756         if (val == 0 && od->plat->errata & DMA_ERRATA_3_3)
 757                 val = omap_dma_chan_read(c, reg);
 758
 759         return val;
 760 }
 761
 762 static dma_addr_t omap_dma_get_src_pos(struct omap_chan *c)
 763 {
 764         struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
 765         dma_addr_t addr, cdac;
 766
 767         if (__dma_omap15xx(od->plat->dma_attr)) {
 768                 addr = omap_dma_chan_read(c, CPC);
 769         } else {
 770                 addr = omap_dma_chan_read_3_3(c, CSAC);
 771                 cdac = omap_dma_chan_read_3_3(c, CDAC);
 772
 773                 /*
 774                  * CDAC == 0 indicates that the DMA transfer on the channel has
 775                  * not been started (no data has been transferred so far).
 776                  * Return the programmed source start address in this case.
 777                  */
 778                 if (cdac == 0)
 779                         addr = omap_dma_chan_read(c, CSSA);
 780         }
 781
 782         if (dma_omap1())
 783                 addr |= omap_dma_chan_read(c, CSSA) & 0xffff0000;
 784
 785         return addr;
 786 }
 787
 788 static dma_addr_t omap_dma_get_dst_pos(struct omap_chan *c)
 789 {
 790         struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
 791         dma_addr_t addr;
 792
 793         if (__dma_omap15xx(od->plat->dma_attr)) {
 794                 addr = omap_dma_chan_read(c, CPC);
 795         } else {
 796                 addr = omap_dma_chan_read_3_3(c, CDAC);
 797
 798                 /*
 799                  * CDAC == 0 indicates that the DMA transfer on the channel
 800                  * has not been started (no data has been transferred so
 801                  * far).  Return the programmed destination start address in
 802                  * this case.
 803                  */
 804                 if (addr == 0)
 805                         addr = omap_dma_chan_read(c, CDSA);
 806         }
 807
 808         if (dma_omap1())
 809                 addr |= omap_dma_chan_read(c, CDSA) & 0xffff0000;
 810
 811         return addr;
 812 }
 813
 814 static enum dma_status omap_dma_tx_status(struct dma_chan *chan,
 815         dma_cookie_t cookie, struct dma_tx_state *txstate)
 816 {
 817         struct omap_chan *c = to_omap_dma_chan(chan);
 818         struct virt_dma_desc *vd;
 819         enum dma_status ret;
 820         unsigned long flags;
 821
 822         ret = dma_cookie_status(chan, cookie, txstate);
 823
 824         if (!c->paused && c->running) {
 825                 uint32_t ccr = omap_dma_chan_read(c, CCR);
 826                 /*
 827                  * The channel is no longer active, set the return value
 828                  * accordingly
 829                  */
 830                 if (!(ccr & CCR_ENABLE))
 831                         ret = DMA_COMPLETE;
 832         }
 833
 834         if (ret == DMA_COMPLETE || !txstate)
 835                 return ret;
 836
 837         spin_lock_irqsave(&c->vc.lock, flags);
 838         vd = vchan_find_desc(&c->vc, cookie);
 839         if (vd) {
 840                 txstate->residue = omap_dma_desc_size(to_omap_dma_desc(&vd->tx));
 841         } else if (c->desc && c->desc->vd.tx.cookie == cookie) {
 842                 struct omap_desc *d = c->desc;
 843                 dma_addr_t pos;
 844
 845                 if (d->dir == DMA_MEM_TO_DEV)
 846                         pos = omap_dma_get_src_pos(c);
 847                 else if (d->dir == DMA_DEV_TO_MEM  || d->dir == DMA_MEM_TO_MEM)
 848                         pos = omap_dma_get_dst_pos(c);
 849                 else
 850                         pos = 0;
 851
 852                 txstate->residue = omap_dma_desc_size_pos(d, pos);
 853         } else {
 854                 txstate->residue = 0;
 855         }
 856         if (ret == DMA_IN_PROGRESS && c->paused)
 857                 ret = DMA_PAUSED;
 858         spin_unlock_irqrestore(&c->vc.lock, flags);
 859
 860         return ret;
 861 }
 862
 863 static void omap_dma_issue_pending(struct dma_chan *chan)
 864 {
 865         struct omap_chan *c = to_omap_dma_chan(chan);
 866         unsigned long flags;
 867
 868         spin_lock_irqsave(&c->vc.lock, flags);
 869         if (vchan_issue_pending(&c->vc) && !c->desc)
 870                 omap_dma_start_desc(c);
 871         spin_unlock_irqrestore(&c->vc.lock, flags);
 872 }
 873
 874 static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
 875         struct dma_chan *chan, struct scatterlist *sgl, unsigned sglen,
 876         enum dma_transfer_direction dir, unsigned long tx_flags, void *context)
 877 {
 878         struct omap_dmadev *od = to_omap_dma_dev(chan->device);
 879         struct omap_chan *c = to_omap_dma_chan(chan);
 880         enum dma_slave_buswidth dev_width;
 881         struct scatterlist *sgent;
 882         struct omap_desc *d;
 883         dma_addr_t dev_addr;
 884         unsigned i, es, en, frame_bytes;
 885         bool ll_failed = false;
 886         u32 burst;
 887         u32 port_window, port_window_bytes;
 888
 889         if (dir == DMA_DEV_TO_MEM) {
 890                 dev_addr = c->cfg.src_addr;
 891                 dev_width = c->cfg.src_addr_width;
 892                 burst = c->cfg.src_maxburst;
 893                 port_window = c->cfg.src_port_window_size;
 894         } else if (dir == DMA_MEM_TO_DEV) {
 895                 dev_addr = c->cfg.dst_addr;
 896                 dev_width = c->cfg.dst_addr_width;
 897                 burst = c->cfg.dst_maxburst;
 898                 port_window = c->cfg.dst_port_window_size;
 899         } else {
 900                 dev_err(chan->device->dev, "%s: bad direction?\n", __func__);
 901                 return NULL;
 902         }
 903
 904         /* Bus width translates to the element size (ES) */
 905         switch (dev_width) {
 906         case DMA_SLAVE_BUSWIDTH_1_BYTE:
 907                 es = CSDP_DATA_TYPE_8;
 908                 break;
 909         case DMA_SLAVE_BUSWIDTH_2_BYTES:
 910                 es = CSDP_DATA_TYPE_16;
 911                 break;
 912         case DMA_SLAVE_BUSWIDTH_4_BYTES:
 913                 es = CSDP_DATA_TYPE_32;
 914                 break;
 915         default: /* not reached */
 916                 return NULL;
 917         }
 918
 919         /* Now allocate and setup the descriptor. */
 920         d = kzalloc(sizeof(*d) + sglen * sizeof(d->sg[0]), GFP_ATOMIC);
 921         if (!d)
 922                 return NULL;
 923
 924         d->dir = dir;
 925         d->dev_addr = dev_addr;
 926         d->es = es;
 927
 928         /* When the port_window is used, one frame must cover the window */
 929         if (port_window) {
 930                 burst = port_window;
 931                 port_window_bytes = port_window * es_bytes[es];
 932
 933                 d->ei = 1;
 934                 /*
 935                  * One frame covers the port_window and by  configure
 936                  * the source frame index to be -1 * (port_window - 1)
 937                  * we instruct the sDMA that after a frame is processed
 938                  * it should move back to the start of the window.
 939                  */
 940                 d->fi = -(port_window_bytes - 1);
 941         }
 942
 943         d->ccr = c->ccr | CCR_SYNC_FRAME;
 944         if (dir == DMA_DEV_TO_MEM) {
 945                 d->csdp = CSDP_DST_BURST_64 | CSDP_DST_PACKED;
 946
 947                 d->ccr |= CCR_DST_AMODE_POSTINC;
 948                 if (port_window) {
 949                         d->ccr |= CCR_SRC_AMODE_DBLIDX;
 950
 951                         if (port_window_bytes >= 64)
 952                                 d->csdp |= CSDP_SRC_BURST_64;
 953                         else if (port_window_bytes >= 32)
 954                                 d->csdp |= CSDP_SRC_BURST_32;
 955                         else if (port_window_bytes >= 16)
 956                                 d->csdp |= CSDP_SRC_BURST_16;
 957
 958                 } else {
 959                         d->ccr |= CCR_SRC_AMODE_CONSTANT;
 960                 }
 961         } else {
 962                 d->csdp = CSDP_SRC_BURST_64 | CSDP_SRC_PACKED;
 963
 964                 d->ccr |= CCR_SRC_AMODE_POSTINC;
 965                 if (port_window) {
 966                         d->ccr |= CCR_DST_AMODE_DBLIDX;
 967
 968                         if (port_window_bytes >= 64)
 969                                 d->csdp |= CSDP_DST_BURST_64;
 970                         else if (port_window_bytes >= 32)
 971                                 d->csdp |= CSDP_DST_BURST_32;
 972                         else if (port_window_bytes >= 16)
 973                                 d->csdp |= CSDP_DST_BURST_16;
 974                 } else {
 975                         d->ccr |= CCR_DST_AMODE_CONSTANT;
 976                 }
 977         }
 978
 979         d->cicr = CICR_DROP_IE | CICR_BLOCK_IE;
 980         d->csdp |= es;
 981
 982         if (dma_omap1()) {
 983                 d->cicr |= CICR_TOUT_IE;
 984
 985                 if (dir == DMA_DEV_TO_MEM)
 986                         d->csdp |= CSDP_DST_PORT_EMIFF | CSDP_SRC_PORT_TIPB;
 987                 else
 988                         d->csdp |= CSDP_DST_PORT_TIPB | CSDP_SRC_PORT_EMIFF;
 989         } else {
 990                 if (dir == DMA_DEV_TO_MEM)
 991                         d->ccr |= CCR_TRIGGER_SRC;
 992
 993                 d->cicr |= CICR_MISALIGNED_ERR_IE | CICR_TRANS_ERR_IE;
 994
 995                 if (port_window)
 996                         d->csdp |= CSDP_WRITE_LAST_NON_POSTED;
 997         }
 998         if (od->plat->errata & DMA_ERRATA_PARALLEL_CHANNELS)
 999                 d->clnk_ctrl = c->dma_ch;
1000
1001         /*
1002          * Build our scatterlist entries: each contains the address,
1003          * the number of elements (EN) in each frame, and the number of
1004          * frames (FN).  Number of bytes for this entry = ES * EN * FN.
1005          *
1006          * Burst size translates to number of elements with frame sync.
1007          * Note: DMA engine defines burst to be the number of dev-width
1008          * transfers.
1009          */
1010         en = burst;
1011         frame_bytes = es_bytes[es] * en;
1012
1013         if (sglen >= 2)
1014                 d->using_ll = od->ll123_supported;
1015
1016         for_each_sg(sgl, sgent, sglen, i) {
1017                 struct omap_sg *osg = &d->sg[i];
1018
1019                 osg->addr = sg_dma_address(sgent);
1020                 osg->en = en;
1021                 osg->fn = sg_dma_len(sgent) / frame_bytes;
1022
1023                 if (d->using_ll) {
1024                         osg->t2_desc = dma_pool_alloc(od->desc_pool, GFP_ATOMIC,
1025                                                       &osg->t2_desc_paddr);
1026                         if (!osg->t2_desc) {
1027                                 dev_err(chan->device->dev,
1028                                         "t2_desc[%d] allocation failed\n", i);
1029                                 ll_failed = true;
1030                                 d->using_ll = false;
1031                                 continue;
1032                         }
1033
1034                         omap_dma_fill_type2_desc(d, i, dir, (i == sglen - 1));
1035                 }
1036         }
1037
1038         d->sglen = sglen;
1039
1040         /* Release the dma_pool entries if one allocation failed */
1041         if (ll_failed) {
1042                 for (i = 0; i < d->sglen; i++) {
1043                         struct omap_sg *osg = &d->sg[i];
1044
1045                         if (osg->t2_desc) {
1046                                 dma_pool_free(od->desc_pool, osg->t2_desc,
1047                                               osg->t2_desc_paddr);
1048                                 osg->t2_desc = NULL;
1049                         }
1050                 }
1051         }
1052
1053         return vchan_tx_prep(&c->vc, &d->vd, tx_flags);
1054 }
1055
1056 static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic(
1057         struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
1058         size_t period_len, enum dma_transfer_direction dir, unsigned long flags)
1059 {
1060         struct omap_dmadev *od = to_omap_dma_dev(chan->device);
1061         struct omap_chan *c = to_omap_dma_chan(chan);
1062         enum dma_slave_buswidth dev_width;
1063         struct omap_desc *d;
1064         dma_addr_t dev_addr;
1065         unsigned es;
1066         u32 burst;
1067
1068         if (dir == DMA_DEV_TO_MEM) {
1069                 dev_addr = c->cfg.src_addr;
1070                 dev_width = c->cfg.src_addr_width;
1071                 burst = c->cfg.src_maxburst;
1072         } else if (dir == DMA_MEM_TO_DEV) {
1073                 dev_addr = c->cfg.dst_addr;
1074                 dev_width = c->cfg.dst_addr_width;
1075                 burst = c->cfg.dst_maxburst;
1076         } else {
1077                 dev_err(chan->device->dev, "%s: bad direction?\n", __func__);
1078                 return NULL;
1079         }
1080
1081         /* Bus width translates to the element size (ES) */
1082         switch (dev_width) {
1083         case DMA_SLAVE_BUSWIDTH_1_BYTE:
1084                 es = CSDP_DATA_TYPE_8;
1085                 break;
1086         case DMA_SLAVE_BUSWIDTH_2_BYTES:
1087                 es = CSDP_DATA_TYPE_16;
1088                 break;
1089         case DMA_SLAVE_BUSWIDTH_4_BYTES:
1090                 es = CSDP_DATA_TYPE_32;
1091                 break;
1092         default: /* not reached */
1093                 return NULL;
1094         }
1095
1096         /* Now allocate and setup the descriptor. */
1097         d = kzalloc(sizeof(*d) + sizeof(d->sg[0]), GFP_ATOMIC);
1098         if (!d)
1099                 return NULL;
1100
1101         d->dir = dir;
1102         d->dev_addr = dev_addr;
1103         d->fi = burst;
1104         d->es = es;
1105         d->sg[0].addr = buf_addr;
1106         d->sg[0].en = period_len / es_bytes[es];
1107         d->sg[0].fn = buf_len / period_len;
1108         d->sglen = 1;
1109
1110         d->ccr = c->ccr;
1111         if (dir == DMA_DEV_TO_MEM)
1112                 d->ccr |= CCR_DST_AMODE_POSTINC | CCR_SRC_AMODE_CONSTANT;
1113         else
1114                 d->ccr |= CCR_DST_AMODE_CONSTANT | CCR_SRC_AMODE_POSTINC;
1115
1116         d->cicr = CICR_DROP_IE;
1117         if (flags & DMA_PREP_INTERRUPT)
1118                 d->cicr |= CICR_FRAME_IE;
1119
1120         d->csdp = es;
1121
1122         if (dma_omap1()) {
1123                 d->cicr |= CICR_TOUT_IE;
1124
1125                 if (dir == DMA_DEV_TO_MEM)
1126                         d->csdp |= CSDP_DST_PORT_EMIFF | CSDP_SRC_PORT_MPUI;
1127                 else
1128                         d->csdp |= CSDP_DST_PORT_MPUI | CSDP_SRC_PORT_EMIFF;
1129         } else {
1130                 if (burst)
1131                         d->ccr |= CCR_SYNC_PACKET;
1132                 else
1133                         d->ccr |= CCR_SYNC_ELEMENT;
1134
1135                 if (dir == DMA_DEV_TO_MEM) {
1136                         d->ccr |= CCR_TRIGGER_SRC;
1137                         d->csdp |= CSDP_DST_PACKED;
1138                 } else {
1139                         d->csdp |= CSDP_SRC_PACKED;
1140                 }
1141
1142                 d->cicr |= CICR_MISALIGNED_ERR_IE | CICR_TRANS_ERR_IE;
1143
1144                 d->csdp |= CSDP_DST_BURST_64 | CSDP_SRC_BURST_64;
1145         }
1146
1147         if (__dma_omap15xx(od->plat->dma_attr))
1148                 d->ccr |= CCR_AUTO_INIT | CCR_REPEAT;
1149         else
1150                 d->clnk_ctrl = c->dma_ch | CLNK_CTRL_ENABLE_LNK;
1151
1152         c->cyclic = true;
1153
1154         return vchan_tx_prep(&c->vc, &d->vd, flags);
1155 }
1156
1157 static struct dma_async_tx_descriptor *omap_dma_prep_dma_memcpy(
1158         struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
1159         size_t len, unsigned long tx_flags)
1160 {
1161         struct omap_chan *c = to_omap_dma_chan(chan);
1162         struct omap_desc *d;
1163         uint8_t data_type;
1164
1165         d = kzalloc(sizeof(*d) + sizeof(d->sg[0]), GFP_ATOMIC);
1166         if (!d)
1167                 return NULL;
1168
1169         data_type = __ffs((src | dest | len));
1170         if (data_type > CSDP_DATA_TYPE_32)
1171                 data_type = CSDP_DATA_TYPE_32;
1172
1173         d->dir = DMA_MEM_TO_MEM;
1174         d->dev_addr = src;
1175         d->fi = 0;
1176         d->es = data_type;
1177         d->sg[0].en = len / BIT(data_type);
1178         d->sg[0].fn = 1;
1179         d->sg[0].addr = dest;
1180         d->sglen = 1;
1181         d->ccr = c->ccr;
1182         d->ccr |= CCR_DST_AMODE_POSTINC | CCR_SRC_AMODE_POSTINC;
1183
1184         d->cicr = CICR_DROP_IE | CICR_FRAME_IE;
1185
1186         d->csdp = data_type;
1187
1188         if (dma_omap1()) {
1189                 d->cicr |= CICR_TOUT_IE;
1190                 d->csdp |= CSDP_DST_PORT_EMIFF | CSDP_SRC_PORT_EMIFF;
1191         } else {
1192                 d->csdp |= CSDP_DST_PACKED | CSDP_SRC_PACKED;
1193                 d->cicr |= CICR_MISALIGNED_ERR_IE | CICR_TRANS_ERR_IE;
1194                 d->csdp |= CSDP_DST_BURST_64 | CSDP_SRC_BURST_64;
1195         }
1196
1197         return vchan_tx_prep(&c->vc, &d->vd, tx_flags);
1198 }
1199
1200 static struct dma_async_tx_descriptor *omap_dma_prep_dma_interleaved(
1201         struct dma_chan *chan, struct dma_interleaved_template *xt,
1202         unsigned long flags)
1203 {
1204         struct omap_chan *c = to_omap_dma_chan(chan);
1205         struct omap_desc *d;
1206         struct omap_sg *sg;
1207         uint8_t data_type;
1208         size_t src_icg, dst_icg;
1209
1210         /* Slave mode is not supported */
1211         if (is_slave_direction(xt->dir))
1212                 return NULL;
1213
1214         if (xt->frame_size != 1 || xt->numf == 0)
1215                 return NULL;
1216
1217         d = kzalloc(sizeof(*d) + sizeof(d->sg[0]), GFP_ATOMIC);
1218         if (!d)
1219                 return NULL;
1220
1221         data_type = __ffs((xt->src_start | xt->dst_start | xt->sgl[0].size));
1222         if (data_type > CSDP_DATA_TYPE_32)
1223                 data_type = CSDP_DATA_TYPE_32;
1224
1225         sg = &d->sg[0];
1226         d->dir = DMA_MEM_TO_MEM;
1227         d->dev_addr = xt->src_start;
1228         d->es = data_type;
1229         sg->en = xt->sgl[0].size / BIT(data_type);
1230         sg->fn = xt->numf;
1231         sg->addr = xt->dst_start;
1232         d->sglen = 1;
1233         d->ccr = c->ccr;
1234
1235         src_icg = dmaengine_get_src_icg(xt, &xt->sgl[0]);
1236         dst_icg = dmaengine_get_dst_icg(xt, &xt->sgl[0]);
1237         if (src_icg) {
1238                 d->ccr |= CCR_SRC_AMODE_DBLIDX;
1239                 d->ei = 1;
1240                 d->fi = src_icg;
1241         } else if (xt->src_inc) {
1242                 d->ccr |= CCR_SRC_AMODE_POSTINC;
1243                 d->fi = 0;
1244         } else {
1245                 dev_err(chan->device->dev,
1246                         "%s: SRC constant addressing is not supported\n",
1247                         __func__);
1248                 kfree(d);
1249                 return NULL;
1250         }
1251
1252         if (dst_icg) {
1253                 d->ccr |= CCR_DST_AMODE_DBLIDX;
1254                 sg->ei = 1;
1255                 sg->fi = dst_icg;
1256         } else if (xt->dst_inc) {
1257                 d->ccr |= CCR_DST_AMODE_POSTINC;
1258                 sg->fi = 0;
1259         } else {
1260                 dev_err(chan->device->dev,
1261                         "%s: DST constant addressing is not supported\n",
1262                         __func__);
1263                 kfree(d);
1264                 return NULL;
1265         }
1266
1267         d->cicr = CICR_DROP_IE | CICR_FRAME_IE;
1268
1269         d->csdp = data_type;
1270
1271         if (dma_omap1()) {
1272                 d->cicr |= CICR_TOUT_IE;
1273                 d->csdp |= CSDP_DST_PORT_EMIFF | CSDP_SRC_PORT_EMIFF;
1274         } else {
1275                 d->csdp |= CSDP_DST_PACKED | CSDP_SRC_PACKED;
1276                 d->cicr |= CICR_MISALIGNED_ERR_IE | CICR_TRANS_ERR_IE;
1277                 d->csdp |= CSDP_DST_BURST_64 | CSDP_SRC_BURST_64;
1278         }
1279
1280         return vchan_tx_prep(&c->vc, &d->vd, flags);
1281 }
1282
1283 static int omap_dma_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
1284 {
1285         struct omap_chan *c = to_omap_dma_chan(chan);
1286
1287         if (cfg->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
1288             cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
1289                 return -EINVAL;
1290
1291         memcpy(&c->cfg, cfg, sizeof(c->cfg));
1292
1293         return 0;
1294 }
1295
1296 static int omap_dma_terminate_all(struct dma_chan *chan)
1297 {
1298         struct omap_chan *c = to_omap_dma_chan(chan);
1299         unsigned long flags;
1300         LIST_HEAD(head);
1301
1302         spin_lock_irqsave(&c->vc.lock, flags);
1303
1304         /*
1305          * Stop DMA activity: we assume the callback will not be called
1306          * after omap_dma_stop() returns (even if it does, it will see
1307          * c->desc is NULL and exit.)
1308          */
1309         if (c->desc) {
1310                 omap_dma_desc_free(&c->desc->vd);
1311                 c->desc = NULL;
1312                 /* Avoid stopping the dma twice */
1313                 if (!c->paused)
1314                         omap_dma_stop(c);
1315         }
1316
1317         c->cyclic = false;
1318         c->paused = false;
1319
1320         vchan_get_all_descriptors(&c->vc, &head);
1321         spin_unlock_irqrestore(&c->vc.lock, flags);
1322         vchan_dma_desc_free_list(&c->vc, &head);
1323
1324         return 0;
1325 }
1326
1327 static void omap_dma_synchronize(struct dma_chan *chan)
1328 {
1329         struct omap_chan *c = to_omap_dma_chan(chan);
1330
1331         vchan_synchronize(&c->vc);
1332 }
1333
1334 static int omap_dma_pause(struct dma_chan *chan)
1335 {
1336         struct omap_chan *c = to_omap_dma_chan(chan);
1337         struct omap_dmadev *od = to_omap_dma_dev(chan->device);
1338         unsigned long flags;
1339         int ret = -EINVAL;
1340         bool can_pause = false;
1341
1342         spin_lock_irqsave(&od->irq_lock, flags);
1343
1344         if (!c->desc)
1345                 goto out;
1346
1347         if (c->cyclic)
1348                 can_pause = true;
1349
1350         /*
1351          * We do not allow DMA_MEM_TO_DEV transfers to be paused.
1352          * From the AM572x TRM, 16.1.4.18 Disabling a Channel During Transfer:
1353          * "When a channel is disabled during a transfer, the channel undergoes
1354          * an abort, unless it is hardware-source-synchronized …".
1355          * A source-synchronised channel is one where the fetching of data is
1356          * under control of the device. In other words, a device-to-memory
1357          * transfer. So, a destination-synchronised channel (which would be a
1358          * memory-to-device transfer) undergoes an abort if the the CCR_ENABLE
1359          * bit is cleared.
1360          * From 16.1.4.20.4.6.2 Abort: "If an abort trigger occurs, the channel
1361          * aborts immediately after completion of current read/write
1362          * transactions and then the FIFO is cleaned up." The term "cleaned up"
1363          * is not defined. TI recommends to check that RD_ACTIVE and WR_ACTIVE
1364          * are both clear _before_ disabling the channel, otherwise data loss
1365          * will occur.
1366          * The problem is that if the channel is active, then device activity
1367          * can result in DMA activity starting between reading those as both
1368          * clear and the write to DMA_CCR to clear the enable bit hitting the
1369          * hardware. If the DMA hardware can't drain the data in its FIFO to the
1370          * destination, then data loss "might" occur (say if we write to an UART
1371          * and the UART is not accepting any further data).
1372          */
1373         else if (c->desc->dir == DMA_DEV_TO_MEM)
1374                 can_pause = true;
1375
1376         if (can_pause && !c->paused) {
1377                 ret = omap_dma_stop(c);
1378                 if (!ret)
1379                         c->paused = true;
1380         }
1381 out:
1382         spin_unlock_irqrestore(&od->irq_lock, flags);
1383
1384         return ret;
1385 }
1386
1387 static int omap_dma_resume(struct dma_chan *chan)
1388 {
1389         struct omap_chan *c = to_omap_dma_chan(chan);
1390         struct omap_dmadev *od = to_omap_dma_dev(chan->device);
1391         unsigned long flags;
1392         int ret = -EINVAL;
1393
1394         spin_lock_irqsave(&od->irq_lock, flags);
1395
1396         if (c->paused && c->desc) {
1397                 mb();
1398
1399                 /* Restore channel link register */
1400                 omap_dma_chan_write(c, CLNK_CTRL, c->desc->clnk_ctrl);
1401
1402                 omap_dma_start(c, c->desc);
1403                 c->paused = false;
1404                 ret = 0;
1405         }
1406         spin_unlock_irqrestore(&od->irq_lock, flags);
1407
1408         return ret;
1409 }
1410
1411 static int omap_dma_chan_init(struct omap_dmadev *od)
1412 {
1413         struct omap_chan *c;
1414
1415         c = kzalloc(sizeof(*c), GFP_KERNEL);
1416         if (!c)
1417                 return -ENOMEM;
1418
1419         c->reg_map = od->reg_map;
1420         c->vc.desc_free = omap_dma_desc_free;
1421         vchan_init(&c->vc, &od->ddev);
1422
1423         return 0;
1424 }
1425
1426 static void omap_dma_free(struct omap_dmadev *od)
1427 {
1428         while (!list_empty(&od->ddev.channels)) {
1429                 struct omap_chan *c = list_first_entry(&od->ddev.channels,
1430                         struct omap_chan, vc.chan.device_node);
1431
1432                 list_del(&c->vc.chan.device_node);
1433                 tasklet_kill(&c->vc.task);
1434                 kfree(c);
1435         }
1436 }
1437
1438 #define OMAP_DMA_BUSWIDTHS      (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
1439                                  BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
1440                                  BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
1441
1442 static int omap_dma_probe(struct platform_device *pdev)
1443 {
1444         struct omap_dmadev *od;
1445         struct resource *res;
1446         int rc, i, irq;
1447         u32 lch_count;
1448
1449         od = devm_kzalloc(&pdev->dev, sizeof(*od), GFP_KERNEL);
1450         if (!od)
1451                 return -ENOMEM;
1452
1453         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1454         od->base = devm_ioremap_resource(&pdev->dev, res);
1455         if (IS_ERR(od->base))
1456                 return PTR_ERR(od->base);
1457
1458         od->plat = omap_get_plat_info();
1459         if (!od->plat)
1460                 return -EPROBE_DEFER;
1461
1462         od->reg_map = od->plat->reg_map;
1463
1464         dma_cap_set(DMA_SLAVE, od->ddev.cap_mask);
1465         dma_cap_set(DMA_CYCLIC, od->ddev.cap_mask);
1466         dma_cap_set(DMA_MEMCPY, od->ddev.cap_mask);
1467         dma_cap_set(DMA_INTERLEAVE, od->ddev.cap_mask);
1468         od->ddev.device_alloc_chan_resources = omap_dma_alloc_chan_resources;
1469         od->ddev.device_free_chan_resources = omap_dma_free_chan_resources;
1470         od->ddev.device_tx_status = omap_dma_tx_status;
1471         od->ddev.device_issue_pending = omap_dma_issue_pending;
1472         od->ddev.device_prep_slave_sg = omap_dma_prep_slave_sg;
1473         od->ddev.device_prep_dma_cyclic = omap_dma_prep_dma_cyclic;
1474         od->ddev.device_prep_dma_memcpy = omap_dma_prep_dma_memcpy;
1475         od->ddev.device_prep_interleaved_dma = omap_dma_prep_dma_interleaved;
1476         od->ddev.device_config = omap_dma_slave_config;
1477         od->ddev.device_pause = omap_dma_pause;
1478         od->ddev.device_resume = omap_dma_resume;
1479         od->ddev.device_terminate_all = omap_dma_terminate_all;
1480         od->ddev.device_synchronize = omap_dma_synchronize;
1481         od->ddev.src_addr_widths = OMAP_DMA_BUSWIDTHS;
1482         od->ddev.dst_addr_widths = OMAP_DMA_BUSWIDTHS;
1483         od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
1484         od->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1485         od->ddev.dev = &pdev->dev;
1486         INIT_LIST_HEAD(&od->ddev.channels);
1487         spin_lock_init(&od->lock);
1488         spin_lock_init(&od->irq_lock);
1489
1490         /* Number of DMA requests */
1491         od->dma_requests = OMAP_SDMA_REQUESTS;
1492         if (pdev->dev.of_node && of_property_read_u32(pdev->dev.of_node,
1493                                                       "dma-requests",
1494                                                       &od->dma_requests)) {
1495                 dev_info(&pdev->dev,
1496                          "Missing dma-requests property, using %u.\n",
1497                          OMAP_SDMA_REQUESTS);
1498         }
1499
1500         /* Number of available logical channels */
1501         if (!pdev->dev.of_node) {
1502                 lch_count = od->plat->dma_attr->lch_count;
1503                 if (unlikely(!lch_count))
1504                         lch_count = OMAP_SDMA_CHANNELS;
1505         } else if (of_property_read_u32(pdev->dev.of_node, "dma-channels",
1506                                         &lch_count)) {
1507                 dev_info(&pdev->dev,
1508                          "Missing dma-channels property, using %u.\n",
1509                          OMAP_SDMA_CHANNELS);
1510                 lch_count = OMAP_SDMA_CHANNELS;
1511         }
1512
1513         od->lch_map = devm_kcalloc(&pdev->dev, lch_count, sizeof(*od->lch_map),
1514                                    GFP_KERNEL);
1515         if (!od->lch_map)
1516                 return -ENOMEM;
1517
1518         for (i = 0; i < od->dma_requests; i++) {
1519                 rc = omap_dma_chan_init(od);
1520                 if (rc) {
1521                         omap_dma_free(od);
1522                         return rc;
1523                 }
1524         }
1525
1526         irq = platform_get_irq(pdev, 1);
1527         if (irq <= 0) {
1528                 dev_info(&pdev->dev, "failed to get L1 IRQ: %d\n", irq);
1529                 od->legacy = true;
1530         } else {
1531                 /* Disable all interrupts */
1532                 od->irq_enable_mask = 0;
1533                 omap_dma_glbl_write(od, IRQENABLE_L1, 0);
1534
1535                 rc = devm_request_irq(&pdev->dev, irq, omap_dma_irq,
1536                                       IRQF_SHARED, "omap-dma-engine", od);
1537                 if (rc)
1538                         return rc;
1539         }
1540
1541         if (omap_dma_glbl_read(od, CAPS_0) & CAPS_0_SUPPORT_LL123)
1542                 od->ll123_supported = true;
1543
1544         od->ddev.filter.map = od->plat->slave_map;
1545         od->ddev.filter.mapcnt = od->plat->slavecnt;
1546         od->ddev.filter.fn = omap_dma_filter_fn;
1547
1548         if (od->ll123_supported) {
1549                 od->desc_pool = dma_pool_create(dev_name(&pdev->dev),
1550                                                 &pdev->dev,
1551                                                 sizeof(struct omap_type2_desc),
1552                                                 4, 0);
1553                 if (!od->desc_pool) {
1554                         dev_err(&pdev->dev,
1555                                 "unable to allocate descriptor pool\n");
1556                         od->ll123_supported = false;
1557                 }
1558         }
1559
1560         rc = dma_async_device_register(&od->ddev);
1561         if (rc) {
1562                 pr_warn("OMAP-DMA: failed to register slave DMA engine device: %d\n",
1563                         rc);
1564                 omap_dma_free(od);
1565                 return rc;
1566         }
1567
1568         platform_set_drvdata(pdev, od);
1569
1570         if (pdev->dev.of_node) {
1571                 omap_dma_info.dma_cap = od->ddev.cap_mask;
1572
1573                 /* Device-tree DMA controller registration */
1574                 rc = of_dma_controller_register(pdev->dev.of_node,
1575                                 of_dma_simple_xlate, &omap_dma_info);
1576                 if (rc) {
1577                         pr_warn("OMAP-DMA: failed to register DMA controller\n");
1578                         dma_async_device_unregister(&od->ddev);
1579                         omap_dma_free(od);
1580                 }
1581         }
1582
1583         dev_info(&pdev->dev, "OMAP DMA engine driver%s\n",
1584                  od->ll123_supported ? " (LinkedList1/2/3 supported)" : "");
1585
1586         return rc;
1587 }
1588
1589 static int omap_dma_remove(struct platform_device *pdev)
1590 {
1591         struct omap_dmadev *od = platform_get_drvdata(pdev);
1592         int irq;
1593
1594         if (pdev->dev.of_node)
1595                 of_dma_controller_free(pdev->dev.of_node);
1596
1597         irq = platform_get_irq(pdev, 1);
1598         devm_free_irq(&pdev->dev, irq, od);
1599
1600         dma_async_device_unregister(&od->ddev);
1601
1602         if (!od->legacy) {
1603                 /* Disable all interrupts */
1604                 omap_dma_glbl_write(od, IRQENABLE_L0, 0);
1605         }
1606
1607         if (od->ll123_supported)
1608                 dma_pool_destroy(od->desc_pool);
1609
1610         omap_dma_free(od);
1611
1612         return 0;
1613 }
1614
1615 static const struct of_device_id omap_dma_match[] = {
1616         { .compatible = "ti,omap2420-sdma", },
1617         { .compatible = "ti,omap2430-sdma", },
1618         { .compatible = "ti,omap3430-sdma", },
1619         { .compatible = "ti,omap3630-sdma", },
1620         { .compatible = "ti,omap4430-sdma", },
1621         {},
1622 };
1623 MODULE_DEVICE_TABLE(of, omap_dma_match);
1624
1625 static struct platform_driver omap_dma_driver = {
1626         .probe  = omap_dma_probe,
1627         .remove = omap_dma_remove,
1628         .driver = {
1629                 .name = "omap-dma-engine",
1630                 .of_match_table = of_match_ptr(omap_dma_match),
1631         },
1632 };
1633
1634 bool omap_dma_filter_fn(struct dma_chan *chan, void *param)
1635 {
1636         if (chan->device->dev->driver == &omap_dma_driver.driver) {
1637                 struct omap_dmadev *od = to_omap_dma_dev(chan->device);
1638                 struct omap_chan *c = to_omap_dma_chan(chan);
1639                 unsigned req = *(unsigned *)param;
1640
1641                 if (req <= od->dma_requests) {
1642                         c->dma_sig = req;
1643                         return true;
1644                 }
1645         }
1646         return false;
1647 }
1648 EXPORT_SYMBOL_GPL(omap_dma_filter_fn);
1649
1650 static int omap_dma_init(void)
1651 {
1652         return platform_driver_register(&omap_dma_driver);
1653 }
1654 subsys_initcall(omap_dma_init);
1655
1656 static void __exit omap_dma_exit(void)
1657 {
1658         platform_driver_unregister(&omap_dma_driver);
1659 }
1660 module_exit(omap_dma_exit);
1661
1662 MODULE_AUTHOR("Russell King");
1663 MODULE_LICENSE("GPL");