SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/dma/shdma.c

   1 /*
   2  * Renesas SuperH DMA Engine support
   3  *
   4  * base is drivers/dma/flsdma.c
   5  *
   6  * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
   7  * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
   8  * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
   9  *
  10  * This is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * - DMA of SuperH does not have Hardware DMA chain mode.
  16  * - MAX DMA size is 16MB.
  17  *
  18  */
  19
  20 #include <linux/init.h>
  21 #include <linux/module.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/dmaengine.h>
  24 #include <linux/delay.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/platform_device.h>
  27 #include <cpu/dma.h>
  28 #include <asm/dma-sh.h>
  29 #include "shdma.h"
  30
  31 /* DMA descriptor control */
  32 enum sh_dmae_desc_status {
  33         DESC_IDLE,
  34         DESC_PREPARED,
  35         DESC_SUBMITTED,
  36         DESC_COMPLETED, /* completed, have to call callback */
  37         DESC_WAITING,   /* callback called, waiting for ack / re-submit */
  38 };
  39
  40 #define NR_DESCS_PER_CHANNEL 32
  41 /*
  42  * Define the default configuration for dual address memory-memory transfer.
  43  * The 0x400 value represents auto-request, external->external.
  44  *
  45  * And this driver set 4byte burst mode.
  46  * If you want to change mode, you need to change RS_DEFAULT of value.
  47  * (ex 1byte burst mode -> (RS_DUAL & ~TS_32)
  48  */
  49 #define RS_DEFAULT  (RS_DUAL)
  50
  51 static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all);
  52
  53 #define SH_DMAC_CHAN_BASE(id) (dma_base_addr[id])
  54 static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
  55 {
  56         ctrl_outl(data, (SH_DMAC_CHAN_BASE(sh_dc->id) + reg));
  57 }
  58
  59 static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
  60 {
  61         return ctrl_inl((SH_DMAC_CHAN_BASE(sh_dc->id) + reg));
  62 }
  63
  64 static void dmae_init(struct sh_dmae_chan *sh_chan)
  65 {
  66         u32 chcr = RS_DEFAULT; /* default is DUAL mode */
  67         sh_dmae_writel(sh_chan, chcr, CHCR);
  68 }
  69
  70 /*
  71  * Reset DMA controller
  72  *
  73  * SH7780 has two DMAOR register
  74  */
  75 static void sh_dmae_ctl_stop(int id)
  76 {
  77         unsigned short dmaor = dmaor_read_reg(id);
  78
  79         dmaor &= ~(DMAOR_NMIF | DMAOR_AE);
  80         dmaor_write_reg(id, dmaor);
  81 }
  82
  83 static int sh_dmae_rst(int id)
  84 {
  85         unsigned short dmaor;
  86
  87         sh_dmae_ctl_stop(id);
  88         dmaor = dmaor_read_reg(id) | DMAOR_INIT;
  89
  90         dmaor_write_reg(id, dmaor);
  91         if (dmaor_read_reg(id) & (DMAOR_AE | DMAOR_NMIF)) {
  92                 pr_warning(KERN_ERR "dma-sh: Can't initialize DMAOR.\n");
  93                 return -EINVAL;
  94         }
  95         return 0;
  96 }
  97
  98 static int dmae_is_busy(struct sh_dmae_chan *sh_chan)
  99 {
 100         u32 chcr = sh_dmae_readl(sh_chan, CHCR);
 101         if (chcr & CHCR_DE) {
 102                 if (!(chcr & CHCR_TE))
 103                         return -EBUSY; /* working */
 104         }
 105         return 0; /* waiting */
 106 }
 107
 108 static inline unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan)
 109 {
 110         u32 chcr = sh_dmae_readl(sh_chan, CHCR);
 111         return ts_shift[(chcr & CHCR_TS_MASK) >> CHCR_TS_SHIFT];
 112 }
 113
 114 static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw)
 115 {
 116         sh_dmae_writel(sh_chan, hw->sar, SAR);
 117         sh_dmae_writel(sh_chan, hw->dar, DAR);
 118         sh_dmae_writel(sh_chan, hw->tcr >> calc_xmit_shift(sh_chan), TCR);
 119 }
 120
 121 static void dmae_start(struct sh_dmae_chan *sh_chan)
 122 {
 123         u32 chcr = sh_dmae_readl(sh_chan, CHCR);
 124
 125         chcr |= CHCR_DE | CHCR_IE;
 126         sh_dmae_writel(sh_chan, chcr, CHCR);
 127 }
 128
 129 static void dmae_halt(struct sh_dmae_chan *sh_chan)
 130 {
 131         u32 chcr = sh_dmae_readl(sh_chan, CHCR);
 132
 133         chcr &= ~(CHCR_DE | CHCR_TE | CHCR_IE);
 134         sh_dmae_writel(sh_chan, chcr, CHCR);
 135 }
 136
 137 static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
 138 {
 139         int ret = dmae_is_busy(sh_chan);
 140         /* When DMA was working, can not set data to CHCR */
 141         if (ret)
 142                 return ret;
 143
 144         sh_dmae_writel(sh_chan, val, CHCR);
 145         return 0;
 146 }
 147
 148 #define DMARS1_ADDR     0x04
 149 #define DMARS2_ADDR     0x08
 150 #define DMARS_SHIFT 8
 151 #define DMARS_CHAN_MSK 0x01
 152 static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
 153 {
 154         u32 addr;
 155         int shift = 0;
 156         int ret = dmae_is_busy(sh_chan);
 157         if (ret)
 158                 return ret;
 159
 160         if (sh_chan->id & DMARS_CHAN_MSK)
 161                 shift = DMARS_SHIFT;
 162
 163         switch (sh_chan->id) {
 164         /* DMARS0 */
 165         case 0:
 166         case 1:
 167                 addr = SH_DMARS_BASE;
 168                 break;
 169         /* DMARS1 */
 170         case 2:
 171         case 3:
 172                 addr = (SH_DMARS_BASE + DMARS1_ADDR);
 173                 break;
 174         /* DMARS2 */
 175         case 4:
 176         case 5:
 177                 addr = (SH_DMARS_BASE + DMARS2_ADDR);
 178                 break;
 179         default:
 180                 return -EINVAL;
 181         }
 182
 183         ctrl_outw((val << shift) |
 184                 (ctrl_inw(addr) & (shift ? 0xFF00 : 0x00FF)),
 185                 addr);
 186
 187         return 0;
 188 }
 189
 190 static dma_cookie_t sh_dmae_tx_submit(struct dma_async_tx_descriptor *tx)
 191 {
 192         struct sh_desc *desc = tx_to_sh_desc(tx), *chunk, *last = desc, *c;
 193         struct sh_dmae_chan *sh_chan = to_sh_chan(tx->chan);
 194         dma_async_tx_callback callback = tx->callback;
 195         dma_cookie_t cookie;
 196
 197         spin_lock_bh(&sh_chan->desc_lock);
 198
 199         cookie = sh_chan->common.cookie;
 200         cookie++;
 201         if (cookie < 0)
 202                 cookie = 1;
 203
 204         sh_chan->common.cookie = cookie;
 205         tx->cookie = cookie;
 206
 207         /* Mark all chunks of this descriptor as submitted, move to the queue */
 208         list_for_each_entry_safe(chunk, c, desc->node.prev, node) {
 209                 /*
 210                  * All chunks are on the global ld_free, so, we have to find
 211                  * the end of the chain ourselves
 212                  */
 213                 if (chunk != desc && (chunk->mark == DESC_IDLE ||
 214                                       chunk->async_tx.cookie > 0 ||
 215                                       chunk->async_tx.cookie == -EBUSY ||
 216                                       &chunk->node == &sh_chan->ld_free))
 217                         break;
 218                 chunk->mark = DESC_SUBMITTED;
 219                 /* Callback goes to the last chunk */
 220                 chunk->async_tx.callback = NULL;
 221                 chunk->cookie = cookie;
 222                 list_move_tail(&chunk->node, &sh_chan->ld_queue);
 223                 last = chunk;
 224         }
 225
 226         last->async_tx.callback = callback;
 227         last->async_tx.callback_param = tx->callback_param;
 228
 229         dev_dbg(sh_chan->dev, "submit #%d@%p on %d: %x[%d] -> %x\n",
 230                 tx->cookie, &last->async_tx, sh_chan->id,
 231                 desc->hw.sar, desc->hw.tcr, desc->hw.dar);
 232
 233         spin_unlock_bh(&sh_chan->desc_lock);
 234
 235         return cookie;
 236 }
 237
 238 /* Called with desc_lock held */
 239 static struct sh_desc *sh_dmae_get_desc(struct sh_dmae_chan *sh_chan)
 240 {
 241         struct sh_desc *desc;
 242
 243         list_for_each_entry(desc, &sh_chan->ld_free, node)
 244                 if (desc->mark != DESC_PREPARED) {
 245                         BUG_ON(desc->mark != DESC_IDLE);
 246                         list_del(&desc->node);
 247                         return desc;
 248                 }
 249
 250         return NULL;
 251 }
 252
 253 static int sh_dmae_alloc_chan_resources(struct dma_chan *chan)
 254 {
 255         struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
 256         struct sh_desc *desc;
 257
 258         spin_lock_bh(&sh_chan->desc_lock);
 259         while (sh_chan->descs_allocated < NR_DESCS_PER_CHANNEL) {
 260                 spin_unlock_bh(&sh_chan->desc_lock);
 261                 desc = kzalloc(sizeof(struct sh_desc), GFP_KERNEL);
 262                 if (!desc) {
 263                         spin_lock_bh(&sh_chan->desc_lock);
 264                         break;
 265                 }
 266                 dma_async_tx_descriptor_init(&desc->async_tx,
 267                                         &sh_chan->common);
 268                 desc->async_tx.tx_submit = sh_dmae_tx_submit;
 269                 desc->mark = DESC_IDLE;
 270
 271                 spin_lock_bh(&sh_chan->desc_lock);
 272                 list_add(&desc->node, &sh_chan->ld_free);
 273                 sh_chan->descs_allocated++;
 274         }
 275         spin_unlock_bh(&sh_chan->desc_lock);
 276
 277         return sh_chan->descs_allocated;
 278 }
 279
 280 /*
 281  * sh_dma_free_chan_resources - Free all resources of the channel.
 282  */
 283 static void sh_dmae_free_chan_resources(struct dma_chan *chan)
 284 {
 285         struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
 286         struct sh_desc *desc, *_desc;
 287         LIST_HEAD(list);
 288
 289         /* Prepared and not submitted descriptors can still be on the queue */
 290         if (!list_empty(&sh_chan->ld_queue))
 291                 sh_dmae_chan_ld_cleanup(sh_chan, true);
 292
 293         spin_lock_bh(&sh_chan->desc_lock);
 294
 295         list_splice_init(&sh_chan->ld_free, &list);
 296         sh_chan->descs_allocated = 0;
 297
 298         spin_unlock_bh(&sh_chan->desc_lock);
 299
 300         list_for_each_entry_safe(desc, _desc, &list, node)
 301                 kfree(desc);
 302 }
 303
 304 static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy(
 305         struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src,
 306         size_t len, unsigned long flags)
 307 {
 308         struct sh_dmae_chan *sh_chan;
 309         struct sh_desc *first = NULL, *prev = NULL, *new;
 310         size_t copy_size;
 311         LIST_HEAD(tx_list);
 312         int chunks = (len + SH_DMA_TCR_MAX) / (SH_DMA_TCR_MAX + 1);
 313
 314         if (!chan)
 315                 return NULL;
 316
 317         if (!len)
 318                 return NULL;
 319
 320         sh_chan = to_sh_chan(chan);
 321
 322         /* Have to lock the whole loop to protect against concurrent release */
 323         spin_lock_bh(&sh_chan->desc_lock);
 324
 325         /*
 326          * Chaining:
 327          * first descriptor is what user is dealing with in all API calls, its
 328          *      cookie is at first set to -EBUSY, at tx-submit to a positive
 329          *      number
 330          * if more than one chunk is needed further chunks have cookie = -EINVAL
 331          * the last chunk, if not equal to the first, has cookie = -ENOSPC
 332          * all chunks are linked onto the tx_list head with their .node heads
 333          *      only during this function, then they are immediately spliced
 334          *      back onto the free list in form of a chain
 335          */
 336         do {
 337                 /* Allocate the link descriptor from the free list */
 338                 new = sh_dmae_get_desc(sh_chan);
 339                 if (!new) {
 340                         dev_err(sh_chan->dev,
 341                                 "No free memory for link descriptor\n");
 342                         list_for_each_entry(new, &tx_list, node)
 343                                 new->mark = DESC_IDLE;
 344                         list_splice(&tx_list, &sh_chan->ld_free);
 345                         spin_unlock_bh(&sh_chan->desc_lock);
 346                         return NULL;
 347                 }
 348
 349                 copy_size = min(len, (size_t)SH_DMA_TCR_MAX + 1);
 350
 351                 new->hw.sar = dma_src;
 352                 new->hw.dar = dma_dest;
 353                 new->hw.tcr = copy_size;
 354                 if (!first) {
 355                         /* First desc */
 356                         new->async_tx.cookie = -EBUSY;
 357                         first = new;
 358                 } else {
 359                         /* Other desc - invisible to the user */
 360                         new->async_tx.cookie = -EINVAL;
 361                 }
 362
 363                 dev_dbg(sh_chan->dev,
 364                         "chaining %u of %u with %p, dst %x, cookie %d\n",
 365                         copy_size, len, &new->async_tx, dma_dest,
 366                         new->async_tx.cookie);
 367
 368                 new->mark = DESC_PREPARED;
 369                 new->async_tx.flags = flags;
 370                 new->chunks = chunks--;
 371
 372                 prev = new;
 373                 len -= copy_size;
 374                 dma_src += copy_size;
 375                 dma_dest += copy_size;
 376                 /* Insert the link descriptor to the LD ring */
 377                 list_add_tail(&new->node, &tx_list);
 378         } while (len);
 379
 380         if (new != first)
 381                 new->async_tx.cookie = -ENOSPC;
 382
 383         /* Put them back on the free list, so, they don't get lost */
 384         list_splice_tail(&tx_list, &sh_chan->ld_free);
 385
 386         spin_unlock_bh(&sh_chan->desc_lock);
 387
 388         return &first->async_tx;
 389 }
 390
 391 static dma_async_tx_callback __ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
 392 {
 393         struct sh_desc *desc, *_desc;
 394         /* Is the "exposed" head of a chain acked? */
 395         bool head_acked = false;
 396         dma_cookie_t cookie = 0;
 397         dma_async_tx_callback callback = NULL;
 398         void *param = NULL;
 399
 400         spin_lock_bh(&sh_chan->desc_lock);
 401         list_for_each_entry_safe(desc, _desc, &sh_chan->ld_queue, node) {
 402                 struct dma_async_tx_descriptor *tx = &desc->async_tx;
 403
 404                 BUG_ON(tx->cookie > 0 && tx->cookie != desc->cookie);
 405                 BUG_ON(desc->mark != DESC_SUBMITTED &&
 406                        desc->mark != DESC_COMPLETED &&
 407                        desc->mark != DESC_WAITING);
 408
 409                 /*
 410                  * queue is ordered, and we use this loop to (1) clean up all
 411                  * completed descriptors, and to (2) update descriptor flags of
 412                  * any chunks in a (partially) completed chain
 413                  */
 414                 if (!all && desc->mark == DESC_SUBMITTED &&
 415                     desc->cookie != cookie)
 416                         break;
 417
 418                 if (tx->cookie > 0)
 419                         cookie = tx->cookie;
 420
 421                 if (desc->mark == DESC_COMPLETED && desc->chunks == 1) {
 422                         BUG_ON(sh_chan->completed_cookie != desc->cookie - 1);
 423                         sh_chan->completed_cookie = desc->cookie;
 424                 }
 425
 426                 /* Call callback on the last chunk */
 427                 if (desc->mark == DESC_COMPLETED && tx->callback) {
 428                         desc->mark = DESC_WAITING;
 429                         callback = tx->callback;
 430                         param = tx->callback_param;
 431                         dev_dbg(sh_chan->dev, "descriptor #%d@%p on %d callback\n",
 432                                 tx->cookie, tx, sh_chan->id);
 433                         BUG_ON(desc->chunks != 1);
 434                         break;
 435                 }
 436
 437                 if (tx->cookie > 0 || tx->cookie == -EBUSY) {
 438                         if (desc->mark == DESC_COMPLETED) {
 439                                 BUG_ON(tx->cookie < 0);
 440                                 desc->mark = DESC_WAITING;
 441                         }
 442                         head_acked = async_tx_test_ack(tx);
 443                 } else {
 444                         switch (desc->mark) {
 445                         case DESC_COMPLETED:
 446                                 desc->mark = DESC_WAITING;
 447                                 /* Fall through */
 448                         case DESC_WAITING:
 449                                 if (head_acked)
 450                                         async_tx_ack(&desc->async_tx);
 451                         }
 452                 }
 453
 454                 dev_dbg(sh_chan->dev, "descriptor %p #%d completed.\n",
 455                         tx, tx->cookie);
 456
 457                 if (((desc->mark == DESC_COMPLETED ||
 458                       desc->mark == DESC_WAITING) &&
 459                      async_tx_test_ack(&desc->async_tx)) || all) {
 460                         /* Remove from ld_queue list */
 461                         desc->mark = DESC_IDLE;
 462                         list_move(&desc->node, &sh_chan->ld_free);
 463                 }
 464         }
 465         spin_unlock_bh(&sh_chan->desc_lock);
 466
 467         if (callback)
 468                 callback(param);
 469
 470         return callback;
 471 }
 472
 473 /*
 474  * sh_chan_ld_cleanup - Clean up link descriptors
 475  *
 476  * This function cleans up the ld_queue of DMA channel.
 477  */
 478 static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
 479 {
 480         while (__ld_cleanup(sh_chan, all))
 481                 ;
 482 }
 483
 484 static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan)
 485 {
 486         struct sh_desc *sd;
 487
 488         spin_lock_bh(&sh_chan->desc_lock);
 489         /* DMA work check */
 490         if (dmae_is_busy(sh_chan)) {
 491                 spin_unlock_bh(&sh_chan->desc_lock);
 492                 return;
 493         }
 494
 495         /* Find the first un-transfer desciptor */
 496         list_for_each_entry(sd, &sh_chan->ld_queue, node)
 497                 if (sd->mark == DESC_SUBMITTED) {
 498                         /* Get the ld start address from ld_queue */
 499                         dmae_set_reg(sh_chan, &sd->hw);
 500                         dmae_start(sh_chan);
 501                         break;
 502                 }
 503
 504         spin_unlock_bh(&sh_chan->desc_lock);
 505 }
 506
 507 static void sh_dmae_memcpy_issue_pending(struct dma_chan *chan)
 508 {
 509         struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
 510         sh_chan_xfer_ld_queue(sh_chan);
 511 }
 512
 513 static enum dma_status sh_dmae_is_complete(struct dma_chan *chan,
 514                                         dma_cookie_t cookie,
 515                                         dma_cookie_t *done,
 516                                         dma_cookie_t *used)
 517 {
 518         struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
 519         dma_cookie_t last_used;
 520         dma_cookie_t last_complete;
 521
 522         sh_dmae_chan_ld_cleanup(sh_chan, false);
 523
 524         last_used = chan->cookie;
 525         last_complete = sh_chan->completed_cookie;
 526         BUG_ON(last_complete < 0);
 527
 528         if (done)
 529                 *done = last_complete;
 530
 531         if (used)
 532                 *used = last_used;
 533
 534         return dma_async_is_complete(cookie, last_complete, last_used);
 535 }
 536
 537 static irqreturn_t sh_dmae_interrupt(int irq, void *data)
 538 {
 539         irqreturn_t ret = IRQ_NONE;
 540         struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data;
 541         u32 chcr = sh_dmae_readl(sh_chan, CHCR);
 542
 543         if (chcr & CHCR_TE) {
 544                 /* DMA stop */
 545                 dmae_halt(sh_chan);
 546
 547                 ret = IRQ_HANDLED;
 548                 tasklet_schedule(&sh_chan->tasklet);
 549         }
 550
 551         return ret;
 552 }
 553
 554 #if defined(CONFIG_CPU_SH4)
 555 static irqreturn_t sh_dmae_err(int irq, void *data)
 556 {
 557         int err = 0;
 558         struct sh_dmae_device *shdev = (struct sh_dmae_device *)data;
 559
 560         /* IRQ Multi */
 561         if (shdev->pdata.mode & SHDMA_MIX_IRQ) {
 562                 int cnt = 0;
 563                 switch (irq) {
 564 #if defined(DMTE6_IRQ) && defined(DMAE1_IRQ)
 565                 case DMTE6_IRQ:
 566                         cnt++;
 567 #endif
 568                 case DMTE0_IRQ:
 569                         if (dmaor_read_reg(cnt) & (DMAOR_NMIF | DMAOR_AE)) {
 570                                 disable_irq(irq);
 571                                 return IRQ_HANDLED;
 572                         }
 573                 default:
 574                         return IRQ_NONE;
 575                 }
 576         } else {
 577                 /* reset dma controller */
 578                 err = sh_dmae_rst(0);
 579                 if (err)
 580                         return err;
 581 #ifdef SH_DMAC_BASE1
 582                 if (shdev->pdata.mode & SHDMA_DMAOR1) {
 583                         err = sh_dmae_rst(1);
 584                         if (err)
 585                                 return err;
 586                 }
 587 #endif
 588                 disable_irq(irq);
 589                 return IRQ_HANDLED;
 590         }
 591 }
 592 #endif
 593
 594 static void dmae_do_tasklet(unsigned long data)
 595 {
 596         struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data;
 597         struct sh_desc *desc;
 598         u32 sar_buf = sh_dmae_readl(sh_chan, SAR);
 599
 600         spin_lock(&sh_chan->desc_lock);
 601         list_for_each_entry(desc, &sh_chan->ld_queue, node) {
 602                 if ((desc->hw.sar + desc->hw.tcr) == sar_buf &&
 603                     desc->mark == DESC_SUBMITTED) {
 604                         dev_dbg(sh_chan->dev, "done #%d@%p dst %u\n",
 605                                 desc->async_tx.cookie, &desc->async_tx,
 606                                 desc->hw.dar);
 607                         desc->mark = DESC_COMPLETED;
 608                         break;
 609                 }
 610         }
 611         spin_unlock(&sh_chan->desc_lock);
 612
 613         /* Next desc */
 614         sh_chan_xfer_ld_queue(sh_chan);
 615         sh_dmae_chan_ld_cleanup(sh_chan, false);
 616 }
 617
 618 static unsigned int get_dmae_irq(unsigned int id)
 619 {
 620         unsigned int irq = 0;
 621         if (id < ARRAY_SIZE(dmte_irq_map))
 622                 irq = dmte_irq_map[id];
 623         return irq;
 624 }
 625
 626 static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id)
 627 {
 628         int err;
 629         unsigned int irq = get_dmae_irq(id);
 630         unsigned long irqflags = IRQF_DISABLED;
 631         struct sh_dmae_chan *new_sh_chan;
 632
 633         /* alloc channel */
 634         new_sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL);
 635         if (!new_sh_chan) {
 636                 dev_err(shdev->common.dev,
 637                         "No free memory for allocating dma channels!\n");
 638                 return -ENOMEM;
 639         }
 640
 641         new_sh_chan->dev = shdev->common.dev;
 642         new_sh_chan->id = id;
 643
 644         /* Init DMA tasklet */
 645         tasklet_init(&new_sh_chan->tasklet, dmae_do_tasklet,
 646                         (unsigned long)new_sh_chan);
 647
 648         /* Init the channel */
 649         dmae_init(new_sh_chan);
 650
 651         spin_lock_init(&new_sh_chan->desc_lock);
 652
 653         /* Init descripter manage list */
 654         INIT_LIST_HEAD(&new_sh_chan->ld_queue);
 655         INIT_LIST_HEAD(&new_sh_chan->ld_free);
 656
 657         /* copy struct dma_device */
 658         new_sh_chan->common.device = &shdev->common;
 659
 660         /* Add the channel to DMA device channel list */
 661         list_add_tail(&new_sh_chan->common.device_node,
 662                         &shdev->common.channels);
 663         shdev->common.chancnt++;
 664
 665         if (shdev->pdata.mode & SHDMA_MIX_IRQ) {
 666                 irqflags = IRQF_SHARED;
 667 #if defined(DMTE6_IRQ)
 668                 if (irq >= DMTE6_IRQ)
 669                         irq = DMTE6_IRQ;
 670                 else
 671 #endif
 672                         irq = DMTE0_IRQ;
 673         }
 674
 675         snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
 676                         "sh-dmae%d", new_sh_chan->id);
 677
 678         /* set up channel irq */
 679         err = request_irq(irq, &sh_dmae_interrupt, irqflags,
 680                           new_sh_chan->dev_id, new_sh_chan);
 681         if (err) {
 682                 dev_err(shdev->common.dev, "DMA channel %d request_irq error "
 683                         "with return %d\n", id, err);
 684                 goto err_no_irq;
 685         }
 686
 687         /* CHCR register control function */
 688         new_sh_chan->set_chcr = dmae_set_chcr;
 689         /* DMARS register control function */
 690         new_sh_chan->set_dmars = dmae_set_dmars;
 691
 692         shdev->chan[id] = new_sh_chan;
 693         return 0;
 694
 695 err_no_irq:
 696         /* remove from dmaengine device node */
 697         list_del(&new_sh_chan->common.device_node);
 698         kfree(new_sh_chan);
 699         return err;
 700 }
 701
 702 static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
 703 {
 704         int i;
 705
 706         for (i = shdev->common.chancnt - 1 ; i >= 0 ; i--) {
 707                 if (shdev->chan[i]) {
 708                         struct sh_dmae_chan *shchan = shdev->chan[i];
 709                         if (!(shdev->pdata.mode & SHDMA_MIX_IRQ))
 710                                 free_irq(dmte_irq_map[i], shchan);
 711
 712                         list_del(&shchan->common.device_node);
 713                         kfree(shchan);
 714                         shdev->chan[i] = NULL;
 715                 }
 716         }
 717         shdev->common.chancnt = 0;
 718 }
 719
 720 static int __init sh_dmae_probe(struct platform_device *pdev)
 721 {
 722         int err = 0, cnt, ecnt;
 723         unsigned long irqflags = IRQF_DISABLED;
 724 #if defined(CONFIG_CPU_SH4)
 725         int eirq[] = { DMAE0_IRQ,
 726 #if defined(DMAE1_IRQ)
 727                         DMAE1_IRQ
 728 #endif
 729                 };
 730 #endif
 731         struct sh_dmae_device *shdev;
 732
 733         /* get platform data */
 734         if (!pdev->dev.platform_data)
 735                 return -ENODEV;
 736
 737         shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL);
 738         if (!shdev) {
 739                 dev_err(&pdev->dev, "No enough memory\n");
 740                 return -ENOMEM;
 741         }
 742
 743         /* platform data */
 744         memcpy(&shdev->pdata, pdev->dev.platform_data,
 745                         sizeof(struct sh_dmae_pdata));
 746
 747         /* reset dma controller */
 748         err = sh_dmae_rst(0);
 749         if (err)
 750                 goto rst_err;
 751
 752         /* SH7780/85/23 has DMAOR1 */
 753         if (shdev->pdata.mode & SHDMA_DMAOR1) {
 754                 err = sh_dmae_rst(1);
 755                 if (err)
 756                         goto rst_err;
 757         }
 758
 759         INIT_LIST_HEAD(&shdev->common.channels);
 760
 761         dma_cap_set(DMA_MEMCPY, shdev->common.cap_mask);
 762         shdev->common.device_alloc_chan_resources
 763                 = sh_dmae_alloc_chan_resources;
 764         shdev->common.device_free_chan_resources = sh_dmae_free_chan_resources;
 765         shdev->common.device_prep_dma_memcpy = sh_dmae_prep_memcpy;
 766         shdev->common.device_is_tx_complete = sh_dmae_is_complete;
 767         shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending;
 768         shdev->common.dev = &pdev->dev;
 769         /* Default transfer size of 32 bytes requires 32-byte alignment */
 770         shdev->common.copy_align = 5;
 771
 772 #if defined(CONFIG_CPU_SH4)
 773         /* Non Mix IRQ mode SH7722/SH7730 etc... */
 774         if (shdev->pdata.mode & SHDMA_MIX_IRQ) {
 775                 irqflags = IRQF_SHARED;
 776                 eirq[0] = DMTE0_IRQ;
 777 #if defined(DMTE6_IRQ) && defined(DMAE1_IRQ)
 778                 eirq[1] = DMTE6_IRQ;
 779 #endif
 780         }
 781
 782         for (ecnt = 0 ; ecnt < ARRAY_SIZE(eirq); ecnt++) {
 783                 err = request_irq(eirq[ecnt], sh_dmae_err, irqflags,
 784                                   "DMAC Address Error", shdev);
 785                 if (err) {
 786                         dev_err(&pdev->dev, "DMA device request_irq"
 787                                 "error (irq %d) with return %d\n",
 788                                 eirq[ecnt], err);
 789                         goto eirq_err;
 790                 }
 791         }
 792 #endif /* CONFIG_CPU_SH4 */
 793
 794         /* Create DMA Channel */
 795         for (cnt = 0 ; cnt < MAX_DMA_CHANNELS ; cnt++) {
 796                 err = sh_dmae_chan_probe(shdev, cnt);
 797                 if (err)
 798                         goto chan_probe_err;
 799         }
 800
 801         platform_set_drvdata(pdev, shdev);
 802         dma_async_device_register(&shdev->common);
 803
 804         return err;
 805
 806 chan_probe_err:
 807         sh_dmae_chan_remove(shdev);
 808
 809 eirq_err:
 810         for (ecnt-- ; ecnt >= 0; ecnt--)
 811                 free_irq(eirq[ecnt], shdev);
 812
 813 rst_err:
 814         kfree(shdev);
 815
 816         return err;
 817 }
 818
 819 static int __exit sh_dmae_remove(struct platform_device *pdev)
 820 {
 821         struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
 822
 823         dma_async_device_unregister(&shdev->common);
 824
 825         if (shdev->pdata.mode & SHDMA_MIX_IRQ) {
 826                 free_irq(DMTE0_IRQ, shdev);
 827 #if defined(DMTE6_IRQ)
 828                 free_irq(DMTE6_IRQ, shdev);
 829 #endif
 830         }
 831
 832         /* channel data remove */
 833         sh_dmae_chan_remove(shdev);
 834
 835         if (!(shdev->pdata.mode & SHDMA_MIX_IRQ)) {
 836                 free_irq(DMAE0_IRQ, shdev);
 837 #if defined(DMAE1_IRQ)
 838                 free_irq(DMAE1_IRQ, shdev);
 839 #endif
 840         }
 841         kfree(shdev);
 842
 843         return 0;
 844 }
 845
 846 static void sh_dmae_shutdown(struct platform_device *pdev)
 847 {
 848         struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
 849         sh_dmae_ctl_stop(0);
 850         if (shdev->pdata.mode & SHDMA_DMAOR1)
 851                 sh_dmae_ctl_stop(1);
 852 }
 853
 854 static struct platform_driver sh_dmae_driver = {
 855         .remove         = __exit_p(sh_dmae_remove),
 856         .shutdown       = sh_dmae_shutdown,
 857         .driver = {
 858                 .name   = "sh-dma-engine",
 859         },
 860 };
 861
 862 static int __init sh_dmae_init(void)
 863 {
 864         return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe);
 865 }
 866 module_init(sh_dmae_init);
 867
 868 static void __exit sh_dmae_exit(void)
 869 {
 870         platform_driver_unregister(&sh_dmae_driver);
 871 }
 872 module_exit(sh_dmae_exit);
 873
 874 MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>");
 875 MODULE_DESCRIPTION("Renesas SH DMA Engine driver");
 876 MODULE_LICENSE("GPL");