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