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/slab.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/dmaengine.h>
  25 #include <linux/delay.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/pm_runtime.h>
  29 #include <linux/sh_dma.h>
  30 #include <linux/notifier.h>
  31 #include <linux/kdebug.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/rculist.h>
  34 #include "shdma.h"
  35
  36 /* DMA descriptor control */
  37 enum sh_dmae_desc_status {
  38         DESC_IDLE,
  39         DESC_PREPARED,
  40         DESC_SUBMITTED,
  41         DESC_COMPLETED, /* completed, have to call callback */
  42         DESC_WAITING,   /* callback called, waiting for ack / re-submit */
  43 };
  44
  45 #define NR_DESCS_PER_CHANNEL 32
  46 /* Default MEMCPY transfer size = 2^2 = 4 bytes */
  47 #define LOG2_DEFAULT_XFER_SIZE  2
  48
  49 /*
  50  * Used for write-side mutual exclusion for the global device list,
  51  * read-side synchronization by way of RCU.
  52  */
  53 static DEFINE_SPINLOCK(sh_dmae_lock);
  54 static LIST_HEAD(sh_dmae_devices);
  55
  56 /* A bitmask with bits enough for enum sh_dmae_slave_chan_id */
  57 static unsigned long sh_dmae_slave_used[BITS_TO_LONGS(SH_DMA_SLAVE_NUMBER)];
  58
  59 static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all);
  60
  61 static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
  62 {
  63         __raw_writel(data, sh_dc->base + reg / sizeof(u32));
  64 }
  65
  66 static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
  67 {
  68         return __raw_readl(sh_dc->base + reg / sizeof(u32));
  69 }
  70
  71 static u16 dmaor_read(struct sh_dmae_device *shdev)
  72 {
  73         return __raw_readw(shdev->chan_reg + DMAOR / sizeof(u32));
  74 }
  75
  76 static void dmaor_write(struct sh_dmae_device *shdev, u16 data)
  77 {
  78         __raw_writew(data, shdev->chan_reg + DMAOR / sizeof(u32));
  79 }
  80
  81 /*
  82  * Reset DMA controller
  83  *
  84  * SH7780 has two DMAOR register
  85  */
  86 static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev)
  87 {
  88         unsigned short dmaor = dmaor_read(shdev);
  89
  90         dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME));
  91 }
  92
  93 static int sh_dmae_rst(struct sh_dmae_device *shdev)
  94 {
  95         unsigned short dmaor;
  96
  97         sh_dmae_ctl_stop(shdev);
  98         dmaor = dmaor_read(shdev) | shdev->pdata->dmaor_init;
  99
 100         dmaor_write(shdev, dmaor);
 101         if (dmaor_read(shdev) & (DMAOR_AE | DMAOR_NMIF)) {
 102                 pr_warning("dma-sh: Can't initialize DMAOR.\n");
 103                 return -EINVAL;
 104         }
 105         return 0;
 106 }
 107
 108 static bool dmae_is_busy(struct sh_dmae_chan *sh_chan)
 109 {
 110         u32 chcr = sh_dmae_readl(sh_chan, CHCR);
 111
 112         if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE)
 113                 return true; /* working */
 114
 115         return false; /* waiting */
 116 }
 117
 118 static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr)
 119 {
 120         struct sh_dmae_device *shdev = container_of(sh_chan->common.device,
 121                                                 struct sh_dmae_device, common);
 122         struct sh_dmae_pdata *pdata = shdev->pdata;
 123         int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) |
 124                 ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift);
 125
 126         if (cnt >= pdata->ts_shift_num)
 127                 cnt = 0;
 128
 129         return pdata->ts_shift[cnt];
 130 }
 131
 132 static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size)
 133 {
 134         struct sh_dmae_device *shdev = container_of(sh_chan->common.device,
 135                                                 struct sh_dmae_device, common);
 136         struct sh_dmae_pdata *pdata = shdev->pdata;
 137         int i;
 138
 139         for (i = 0; i < pdata->ts_shift_num; i++)
 140                 if (pdata->ts_shift[i] == l2size)
 141                         break;
 142
 143         if (i == pdata->ts_shift_num)
 144                 i = 0;
 145
 146         return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) |
 147                 ((i << pdata->ts_high_shift) & pdata->ts_high_mask);
 148 }
 149
 150 static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw)
 151 {
 152         sh_dmae_writel(sh_chan, hw->sar, SAR);
 153         sh_dmae_writel(sh_chan, hw->dar, DAR);
 154         sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR);
 155 }
 156
 157 static void dmae_start(struct sh_dmae_chan *sh_chan)
 158 {
 159         u32 chcr = sh_dmae_readl(sh_chan, CHCR);
 160
 161         chcr |= CHCR_DE | CHCR_IE;
 162         sh_dmae_writel(sh_chan, chcr & ~CHCR_TE, CHCR);
 163 }
 164
 165 static void dmae_halt(struct sh_dmae_chan *sh_chan)
 166 {
 167         u32 chcr = sh_dmae_readl(sh_chan, CHCR);
 168
 169         chcr &= ~(CHCR_DE | CHCR_TE | CHCR_IE);
 170         sh_dmae_writel(sh_chan, chcr, CHCR);
 171 }
 172
 173 static void dmae_init(struct sh_dmae_chan *sh_chan)
 174 {
 175         /*
 176          * Default configuration for dual address memory-memory transfer.
 177          * 0x400 represents auto-request.
 178          */
 179         u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan,
 180                                                    LOG2_DEFAULT_XFER_SIZE);
 181         sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr);
 182         sh_dmae_writel(sh_chan, chcr, CHCR);
 183 }
 184
 185 static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
 186 {
 187         /* When DMA was working, can not set data to CHCR */
 188         if (dmae_is_busy(sh_chan))
 189                 return -EBUSY;
 190
 191         sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val);
 192         sh_dmae_writel(sh_chan, val, CHCR);
 193
 194         return 0;
 195 }
 196
 197 static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
 198 {
 199         struct sh_dmae_device *shdev = container_of(sh_chan->common.device,
 200                                                 struct sh_dmae_device, common);
 201         struct sh_dmae_pdata *pdata = shdev->pdata;
 202         const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->id];
 203         u16 __iomem *addr = shdev->dmars + chan_pdata->dmars / sizeof(u16);
 204         int shift = chan_pdata->dmars_bit;
 205
 206         if (dmae_is_busy(sh_chan))
 207                 return -EBUSY;
 208
 209         __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift),
 210                      addr);
 211
 212         return 0;
 213 }
 214
 215 static dma_cookie_t sh_dmae_tx_submit(struct dma_async_tx_descriptor *tx)
 216 {
 217         struct sh_desc *desc = tx_to_sh_desc(tx), *chunk, *last = desc, *c;
 218         struct sh_dmae_chan *sh_chan = to_sh_chan(tx->chan);
 219         dma_async_tx_callback callback = tx->callback;
 220         dma_cookie_t cookie;
 221
 222         spin_lock_bh(&sh_chan->desc_lock);
 223
 224         cookie = sh_chan->common.cookie;
 225         cookie++;
 226         if (cookie < 0)
 227                 cookie = 1;
 228
 229         sh_chan->common.cookie = cookie;
 230         tx->cookie = cookie;
 231
 232         /* Mark all chunks of this descriptor as submitted, move to the queue */
 233         list_for_each_entry_safe(chunk, c, desc->node.prev, node) {
 234                 /*
 235                  * All chunks are on the global ld_free, so, we have to find
 236                  * the end of the chain ourselves
 237                  */
 238                 if (chunk != desc && (chunk->mark == DESC_IDLE ||
 239                                       chunk->async_tx.cookie > 0 ||
 240                                       chunk->async_tx.cookie == -EBUSY ||
 241                                       &chunk->node == &sh_chan->ld_free))
 242                         break;
 243                 chunk->mark = DESC_SUBMITTED;
 244                 /* Callback goes to the last chunk */
 245                 chunk->async_tx.callback = NULL;
 246                 chunk->cookie = cookie;
 247                 list_move_tail(&chunk->node, &sh_chan->ld_queue);
 248                 last = chunk;
 249         }
 250
 251         last->async_tx.callback = callback;
 252         last->async_tx.callback_param = tx->callback_param;
 253
 254         dev_dbg(sh_chan->dev, "submit #%d@%p on %d: %x[%d] -> %x\n",
 255                 tx->cookie, &last->async_tx, sh_chan->id,
 256                 desc->hw.sar, desc->hw.tcr, desc->hw.dar);
 257
 258         spin_unlock_bh(&sh_chan->desc_lock);
 259
 260         return cookie;
 261 }
 262
 263 /* Called with desc_lock held */
 264 static struct sh_desc *sh_dmae_get_desc(struct sh_dmae_chan *sh_chan)
 265 {
 266         struct sh_desc *desc;
 267
 268         list_for_each_entry(desc, &sh_chan->ld_free, node)
 269                 if (desc->mark != DESC_PREPARED) {
 270                         BUG_ON(desc->mark != DESC_IDLE);
 271                         list_del(&desc->node);
 272                         return desc;
 273                 }
 274
 275         return NULL;
 276 }
 277
 278 static const struct sh_dmae_slave_config *sh_dmae_find_slave(
 279         struct sh_dmae_chan *sh_chan, struct sh_dmae_slave *param)
 280 {
 281         struct dma_device *dma_dev = sh_chan->common.device;
 282         struct sh_dmae_device *shdev = container_of(dma_dev,
 283                                         struct sh_dmae_device, common);
 284         struct sh_dmae_pdata *pdata = shdev->pdata;
 285         int i;
 286
 287         if (param->slave_id >= SH_DMA_SLAVE_NUMBER)
 288                 return NULL;
 289
 290         for (i = 0; i < pdata->slave_num; i++)
 291                 if (pdata->slave[i].slave_id == param->slave_id)
 292                         return pdata->slave + i;
 293
 294         return NULL;
 295 }
 296
 297 static int sh_dmae_alloc_chan_resources(struct dma_chan *chan)
 298 {
 299         struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
 300         struct sh_desc *desc;
 301         struct sh_dmae_slave *param = chan->private;
 302         int ret;
 303
 304         pm_runtime_get_sync(sh_chan->dev);
 305
 306         /*
 307          * This relies on the guarantee from dmaengine that alloc_chan_resources
 308          * never runs concurrently with itself or free_chan_resources.
 309          */
 310         if (param) {
 311                 const struct sh_dmae_slave_config *cfg;
 312
 313                 cfg = sh_dmae_find_slave(sh_chan, param);
 314                 if (!cfg) {
 315                         ret = -EINVAL;
 316                         goto efindslave;
 317                 }
 318
 319                 if (test_and_set_bit(param->slave_id, sh_dmae_slave_used)) {
 320                         ret = -EBUSY;
 321                         goto etestused;
 322                 }
 323
 324                 param->config = cfg;
 325
 326                 dmae_set_dmars(sh_chan, cfg->mid_rid);
 327                 dmae_set_chcr(sh_chan, cfg->chcr);
 328         } else if ((sh_dmae_readl(sh_chan, CHCR) & 0xf00) != 0x400) {
 329                 dmae_init(sh_chan);
 330         }
 331
 332         spin_lock_bh(&sh_chan->desc_lock);
 333         while (sh_chan->descs_allocated < NR_DESCS_PER_CHANNEL) {
 334                 spin_unlock_bh(&sh_chan->desc_lock);
 335                 desc = kzalloc(sizeof(struct sh_desc), GFP_KERNEL);
 336                 if (!desc) {
 337                         spin_lock_bh(&sh_chan->desc_lock);
 338                         break;
 339                 }
 340                 dma_async_tx_descriptor_init(&desc->async_tx,
 341                                         &sh_chan->common);
 342                 desc->async_tx.tx_submit = sh_dmae_tx_submit;
 343                 desc->mark = DESC_IDLE;
 344
 345                 spin_lock_bh(&sh_chan->desc_lock);
 346                 list_add(&desc->node, &sh_chan->ld_free);
 347                 sh_chan->descs_allocated++;
 348         }
 349         spin_unlock_bh(&sh_chan->desc_lock);
 350
 351         if (!sh_chan->descs_allocated) {
 352                 ret = -ENOMEM;
 353                 goto edescalloc;
 354         }
 355
 356         return sh_chan->descs_allocated;
 357
 358 edescalloc:
 359         if (param)
 360                 clear_bit(param->slave_id, sh_dmae_slave_used);
 361 etestused:
 362 efindslave:
 363         pm_runtime_put(sh_chan->dev);
 364         return ret;
 365 }
 366
 367 /*
 368  * sh_dma_free_chan_resources - Free all resources of the channel.
 369  */
 370 static void sh_dmae_free_chan_resources(struct dma_chan *chan)
 371 {
 372         struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
 373         struct sh_desc *desc, *_desc;
 374         LIST_HEAD(list);
 375         int descs = sh_chan->descs_allocated;
 376
 377         dmae_halt(sh_chan);
 378
 379         /* Prepared and not submitted descriptors can still be on the queue */
 380         if (!list_empty(&sh_chan->ld_queue))
 381                 sh_dmae_chan_ld_cleanup(sh_chan, true);
 382
 383         if (chan->private) {
 384                 /* The caller is holding dma_list_mutex */
 385                 struct sh_dmae_slave *param = chan->private;
 386                 clear_bit(param->slave_id, sh_dmae_slave_used);
 387         }
 388
 389         spin_lock_bh(&sh_chan->desc_lock);
 390
 391         list_splice_init(&sh_chan->ld_free, &list);
 392         sh_chan->descs_allocated = 0;
 393
 394         spin_unlock_bh(&sh_chan->desc_lock);
 395
 396         if (descs > 0)
 397                 pm_runtime_put(sh_chan->dev);
 398
 399         list_for_each_entry_safe(desc, _desc, &list, node)
 400                 kfree(desc);
 401 }
 402
 403 /**
 404  * sh_dmae_add_desc - get, set up and return one transfer descriptor
 405  * @sh_chan:    DMA channel
 406  * @flags:      DMA transfer flags
 407  * @dest:       destination DMA address, incremented when direction equals
 408  *              DMA_FROM_DEVICE or DMA_BIDIRECTIONAL
 409  * @src:        source DMA address, incremented when direction equals
 410  *              DMA_TO_DEVICE or DMA_BIDIRECTIONAL
 411  * @len:        DMA transfer length
 412  * @first:      if NULL, set to the current descriptor and cookie set to -EBUSY
 413  * @direction:  needed for slave DMA to decide which address to keep constant,
 414  *              equals DMA_BIDIRECTIONAL for MEMCPY
 415  * Returns 0 or an error
 416  * Locks: called with desc_lock held
 417  */
 418 static struct sh_desc *sh_dmae_add_desc(struct sh_dmae_chan *sh_chan,
 419         unsigned long flags, dma_addr_t *dest, dma_addr_t *src, size_t *len,
 420         struct sh_desc **first, enum dma_data_direction direction)
 421 {
 422         struct sh_desc *new;
 423         size_t copy_size;
 424
 425         if (!*len)
 426                 return NULL;
 427
 428         /* Allocate the link descriptor from the free list */
 429         new = sh_dmae_get_desc(sh_chan);
 430         if (!new) {
 431                 dev_err(sh_chan->dev, "No free link descriptor available\n");
 432                 return NULL;
 433         }
 434
 435         copy_size = min(*len, (size_t)SH_DMA_TCR_MAX + 1);
 436
 437         new->hw.sar = *src;
 438         new->hw.dar = *dest;
 439         new->hw.tcr = copy_size;
 440
 441         if (!*first) {
 442                 /* First desc */
 443                 new->async_tx.cookie = -EBUSY;
 444                 *first = new;
 445         } else {
 446                 /* Other desc - invisible to the user */
 447                 new->async_tx.cookie = -EINVAL;
 448         }
 449
 450         dev_dbg(sh_chan->dev,
 451                 "chaining (%u/%u)@%x -> %x with %p, cookie %d, shift %d\n",
 452                 copy_size, *len, *src, *dest, &new->async_tx,
 453                 new->async_tx.cookie, sh_chan->xmit_shift);
 454
 455         new->mark = DESC_PREPARED;
 456         new->async_tx.flags = flags;
 457         new->direction = direction;
 458
 459         *len -= copy_size;
 460         if (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE)
 461                 *src += copy_size;
 462         if (direction == DMA_BIDIRECTIONAL || direction == DMA_FROM_DEVICE)
 463                 *dest += copy_size;
 464
 465         return new;
 466 }
 467
 468 /*
 469  * sh_dmae_prep_sg - prepare transfer descriptors from an SG list
 470  *
 471  * Common routine for public (MEMCPY) and slave DMA. The MEMCPY case is also
 472  * converted to scatter-gather to guarantee consistent locking and a correct
 473  * list manipulation. For slave DMA direction carries the usual meaning, and,
 474  * logically, the SG list is RAM and the addr variable contains slave address,
 475  * e.g., the FIFO I/O register. For MEMCPY direction equals DMA_BIDIRECTIONAL
 476  * and the SG list contains only one element and points at the source buffer.
 477  */
 478 static struct dma_async_tx_descriptor *sh_dmae_prep_sg(struct sh_dmae_chan *sh_chan,
 479         struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr,
 480         enum dma_data_direction direction, unsigned long flags)
 481 {
 482         struct scatterlist *sg;
 483         struct sh_desc *first = NULL, *new = NULL /* compiler... */;
 484         LIST_HEAD(tx_list);
 485         int chunks = 0;
 486         int i;
 487
 488         if (!sg_len)
 489                 return NULL;
 490
 491         for_each_sg(sgl, sg, sg_len, i)
 492                 chunks += (sg_dma_len(sg) + SH_DMA_TCR_MAX) /
 493                         (SH_DMA_TCR_MAX + 1);
 494
 495         /* Have to lock the whole loop to protect against concurrent release */
 496         spin_lock_bh(&sh_chan->desc_lock);
 497
 498         /*
 499          * Chaining:
 500          * first descriptor is what user is dealing with in all API calls, its
 501          *      cookie is at first set to -EBUSY, at tx-submit to a positive
 502          *      number
 503          * if more than one chunk is needed further chunks have cookie = -EINVAL
 504          * the last chunk, if not equal to the first, has cookie = -ENOSPC
 505          * all chunks are linked onto the tx_list head with their .node heads
 506          *      only during this function, then they are immediately spliced
 507          *      back onto the free list in form of a chain
 508          */
 509         for_each_sg(sgl, sg, sg_len, i) {
 510                 dma_addr_t sg_addr = sg_dma_address(sg);
 511                 size_t len = sg_dma_len(sg);
 512
 513                 if (!len)
 514                         goto err_get_desc;
 515
 516                 do {
 517                         dev_dbg(sh_chan->dev, "Add SG #%d@%p[%d], dma %llx\n",
 518                                 i, sg, len, (unsigned long long)sg_addr);
 519
 520                         if (direction == DMA_FROM_DEVICE)
 521                                 new = sh_dmae_add_desc(sh_chan, flags,
 522                                                 &sg_addr, addr, &len, &first,
 523                                                 direction);
 524                         else
 525                                 new = sh_dmae_add_desc(sh_chan, flags,
 526                                                 addr, &sg_addr, &len, &first,
 527                                                 direction);
 528                         if (!new)
 529                                 goto err_get_desc;
 530
 531                         new->chunks = chunks--;
 532                         list_add_tail(&new->node, &tx_list);
 533                 } while (len);
 534         }
 535
 536         if (new != first)
 537                 new->async_tx.cookie = -ENOSPC;
 538
 539         /* Put them back on the free list, so, they don't get lost */
 540         list_splice_tail(&tx_list, &sh_chan->ld_free);
 541
 542         spin_unlock_bh(&sh_chan->desc_lock);
 543
 544         return &first->async_tx;
 545
 546 err_get_desc:
 547         list_for_each_entry(new, &tx_list, node)
 548                 new->mark = DESC_IDLE;
 549         list_splice(&tx_list, &sh_chan->ld_free);
 550
 551         spin_unlock_bh(&sh_chan->desc_lock);
 552
 553         return NULL;
 554 }
 555
 556 static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy(
 557         struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src,
 558         size_t len, unsigned long flags)
 559 {
 560         struct sh_dmae_chan *sh_chan;
 561         struct scatterlist sg;
 562
 563         if (!chan || !len)
 564                 return NULL;
 565
 566         chan->private = NULL;
 567
 568         sh_chan = to_sh_chan(chan);
 569
 570         sg_init_table(&sg, 1);
 571         sg_set_page(&sg, pfn_to_page(PFN_DOWN(dma_src)), len,
 572                     offset_in_page(dma_src));
 573         sg_dma_address(&sg) = dma_src;
 574         sg_dma_len(&sg) = len;
 575
 576         return sh_dmae_prep_sg(sh_chan, &sg, 1, &dma_dest, DMA_BIDIRECTIONAL,
 577                                flags);
 578 }
 579
 580 static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg(
 581         struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
 582         enum dma_data_direction direction, unsigned long flags)
 583 {
 584         struct sh_dmae_slave *param;
 585         struct sh_dmae_chan *sh_chan;
 586         dma_addr_t slave_addr;
 587
 588         if (!chan)
 589                 return NULL;
 590
 591         sh_chan = to_sh_chan(chan);
 592         param = chan->private;
 593
 594         /* Someone calling slave DMA on a public channel? */
 595         if (!param || !sg_len) {
 596                 dev_warn(sh_chan->dev, "%s: bad parameter: %p, %d, %d\n",
 597                          __func__, param, sg_len, param ? param->slave_id : -1);
 598                 return NULL;
 599         }
 600
 601         slave_addr = param->config->addr;
 602
 603         /*
 604          * if (param != NULL), this is a successfully requested slave channel,
 605          * therefore param->config != NULL too.
 606          */
 607         return sh_dmae_prep_sg(sh_chan, sgl, sg_len, &slave_addr,
 608                                direction, flags);
 609 }
 610
 611 static int sh_dmae_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
 612                            unsigned long arg)
 613 {
 614         struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
 615
 616         /* Only supports DMA_TERMINATE_ALL */
 617         if (cmd != DMA_TERMINATE_ALL)
 618                 return -ENXIO;
 619
 620         if (!chan)
 621                 return -EINVAL;
 622
 623         dmae_halt(sh_chan);
 624
 625         spin_lock_bh(&sh_chan->desc_lock);
 626         if (!list_empty(&sh_chan->ld_queue)) {
 627                 /* Record partial transfer */
 628                 struct sh_desc *desc = list_entry(sh_chan->ld_queue.next,
 629                                                   struct sh_desc, node);
 630                 desc->partial = (desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) <<
 631                         sh_chan->xmit_shift;
 632
 633         }
 634         spin_unlock_bh(&sh_chan->desc_lock);
 635
 636         sh_dmae_chan_ld_cleanup(sh_chan, true);
 637
 638         return 0;
 639 }
 640
 641 static dma_async_tx_callback __ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
 642 {
 643         struct sh_desc *desc, *_desc;
 644         /* Is the "exposed" head of a chain acked? */
 645         bool head_acked = false;
 646         dma_cookie_t cookie = 0;
 647         dma_async_tx_callback callback = NULL;
 648         void *param = NULL;
 649
 650         spin_lock_bh(&sh_chan->desc_lock);
 651         list_for_each_entry_safe(desc, _desc, &sh_chan->ld_queue, node) {
 652                 struct dma_async_tx_descriptor *tx = &desc->async_tx;
 653
 654                 BUG_ON(tx->cookie > 0 && tx->cookie != desc->cookie);
 655                 BUG_ON(desc->mark != DESC_SUBMITTED &&
 656                        desc->mark != DESC_COMPLETED &&
 657                        desc->mark != DESC_WAITING);
 658
 659                 /*
 660                  * queue is ordered, and we use this loop to (1) clean up all
 661                  * completed descriptors, and to (2) update descriptor flags of
 662                  * any chunks in a (partially) completed chain
 663                  */
 664                 if (!all && desc->mark == DESC_SUBMITTED &&
 665                     desc->cookie != cookie)
 666                         break;
 667
 668                 if (tx->cookie > 0)
 669                         cookie = tx->cookie;
 670
 671                 if (desc->mark == DESC_COMPLETED && desc->chunks == 1) {
 672                         if (sh_chan->completed_cookie != desc->cookie - 1)
 673                                 dev_dbg(sh_chan->dev,
 674                                         "Completing cookie %d, expected %d\n",
 675                                         desc->cookie,
 676                                         sh_chan->completed_cookie + 1);
 677                         sh_chan->completed_cookie = desc->cookie;
 678                 }
 679
 680                 /* Call callback on the last chunk */
 681                 if (desc->mark == DESC_COMPLETED && tx->callback) {
 682                         desc->mark = DESC_WAITING;
 683                         callback = tx->callback;
 684                         param = tx->callback_param;
 685                         dev_dbg(sh_chan->dev, "descriptor #%d@%p on %d callback\n",
 686                                 tx->cookie, tx, sh_chan->id);
 687                         BUG_ON(desc->chunks != 1);
 688                         break;
 689                 }
 690
 691                 if (tx->cookie > 0 || tx->cookie == -EBUSY) {
 692                         if (desc->mark == DESC_COMPLETED) {
 693                                 BUG_ON(tx->cookie < 0);
 694                                 desc->mark = DESC_WAITING;
 695                         }
 696                         head_acked = async_tx_test_ack(tx);
 697                 } else {
 698                         switch (desc->mark) {
 699                         case DESC_COMPLETED:
 700                                 desc->mark = DESC_WAITING;
 701                                 /* Fall through */
 702                         case DESC_WAITING:
 703                                 if (head_acked)
 704                                         async_tx_ack(&desc->async_tx);
 705                         }
 706                 }
 707
 708                 dev_dbg(sh_chan->dev, "descriptor %p #%d completed.\n",
 709                         tx, tx->cookie);
 710
 711                 if (((desc->mark == DESC_COMPLETED ||
 712                       desc->mark == DESC_WAITING) &&
 713                      async_tx_test_ack(&desc->async_tx)) || all) {
 714                         /* Remove from ld_queue list */
 715                         desc->mark = DESC_IDLE;
 716                         list_move(&desc->node, &sh_chan->ld_free);
 717                 }
 718         }
 719         spin_unlock_bh(&sh_chan->desc_lock);
 720
 721         if (callback)
 722                 callback(param);
 723
 724         return callback;
 725 }
 726
 727 /*
 728  * sh_chan_ld_cleanup - Clean up link descriptors
 729  *
 730  * This function cleans up the ld_queue of DMA channel.
 731  */
 732 static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
 733 {
 734         while (__ld_cleanup(sh_chan, all))
 735                 ;
 736
 737         if (all)
 738                 /* Terminating - forgive uncompleted cookies */
 739                 sh_chan->completed_cookie = sh_chan->common.cookie;
 740 }
 741
 742 static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan)
 743 {
 744         struct sh_desc *desc;
 745
 746         spin_lock_bh(&sh_chan->desc_lock);
 747         /* DMA work check */
 748         if (dmae_is_busy(sh_chan)) {
 749                 spin_unlock_bh(&sh_chan->desc_lock);
 750                 return;
 751         }
 752
 753         /* Find the first not transferred descriptor */
 754         list_for_each_entry(desc, &sh_chan->ld_queue, node)
 755                 if (desc->mark == DESC_SUBMITTED) {
 756                         dev_dbg(sh_chan->dev, "Queue #%d to %d: %u@%x -> %x\n",
 757                                 desc->async_tx.cookie, sh_chan->id,
 758                                 desc->hw.tcr, desc->hw.sar, desc->hw.dar);
 759                         /* Get the ld start address from ld_queue */
 760                         dmae_set_reg(sh_chan, &desc->hw);
 761                         dmae_start(sh_chan);
 762                         break;
 763                 }
 764
 765         spin_unlock_bh(&sh_chan->desc_lock);
 766 }
 767
 768 static void sh_dmae_memcpy_issue_pending(struct dma_chan *chan)
 769 {
 770         struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
 771         sh_chan_xfer_ld_queue(sh_chan);
 772 }
 773
 774 static enum dma_status sh_dmae_tx_status(struct dma_chan *chan,
 775                                         dma_cookie_t cookie,
 776                                         struct dma_tx_state *txstate)
 777 {
 778         struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
 779         dma_cookie_t last_used;
 780         dma_cookie_t last_complete;
 781         enum dma_status status;
 782
 783         sh_dmae_chan_ld_cleanup(sh_chan, false);
 784
 785         last_used = chan->cookie;
 786         last_complete = sh_chan->completed_cookie;
 787         BUG_ON(last_complete < 0);
 788         dma_set_tx_state(txstate, last_complete, last_used, 0);
 789
 790         spin_lock_bh(&sh_chan->desc_lock);
 791
 792         status = dma_async_is_complete(cookie, last_complete, last_used);
 793
 794         /*
 795          * If we don't find cookie on the queue, it has been aborted and we have
 796          * to report error
 797          */
 798         if (status != DMA_SUCCESS) {
 799                 struct sh_desc *desc;
 800                 status = DMA_ERROR;
 801                 list_for_each_entry(desc, &sh_chan->ld_queue, node)
 802                         if (desc->cookie == cookie) {
 803                                 status = DMA_IN_PROGRESS;
 804                                 break;
 805                         }
 806         }
 807
 808         spin_unlock_bh(&sh_chan->desc_lock);
 809
 810         return status;
 811 }
 812
 813 static irqreturn_t sh_dmae_interrupt(int irq, void *data)
 814 {
 815         irqreturn_t ret = IRQ_NONE;
 816         struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data;
 817         u32 chcr = sh_dmae_readl(sh_chan, CHCR);
 818
 819         if (chcr & CHCR_TE) {
 820                 /* DMA stop */
 821                 dmae_halt(sh_chan);
 822
 823                 ret = IRQ_HANDLED;
 824                 tasklet_schedule(&sh_chan->tasklet);
 825         }
 826
 827         return ret;
 828 }
 829
 830 static unsigned int sh_dmae_reset(struct sh_dmae_device *shdev)
 831 {
 832         unsigned int handled = 0;
 833         int i;
 834
 835         /* halt the dma controller */
 836         sh_dmae_ctl_stop(shdev);
 837
 838         /* We cannot detect, which channel caused the error, have to reset all */
 839         for (i = 0; i < SH_DMAC_MAX_CHANNELS; i++) {
 840                 struct sh_dmae_chan *sh_chan = shdev->chan[i];
 841                 struct sh_desc *desc;
 842
 843                 if (!sh_chan)
 844                         continue;
 845
 846                 /* Stop the channel */
 847                 dmae_halt(sh_chan);
 848
 849                 /* Complete all  */
 850                 list_for_each_entry(desc, &sh_chan->ld_queue, node) {
 851                         struct dma_async_tx_descriptor *tx = &desc->async_tx;
 852                         desc->mark = DESC_IDLE;
 853                         if (tx->callback)
 854                                 tx->callback(tx->callback_param);
 855                 }
 856
 857                 list_splice_init(&sh_chan->ld_queue, &sh_chan->ld_free);
 858                 handled++;
 859         }
 860
 861         sh_dmae_rst(shdev);
 862
 863         return !!handled;
 864 }
 865
 866 static irqreturn_t sh_dmae_err(int irq, void *data)
 867 {
 868         struct sh_dmae_device *shdev = data;
 869
 870         if (dmaor_read(shdev) & DMAOR_AE)
 871                 return IRQ_RETVAL(sh_dmae_reset(data));
 872         else
 873                 return IRQ_NONE;
 874 }
 875
 876 static void dmae_do_tasklet(unsigned long data)
 877 {
 878         struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data;
 879         struct sh_desc *desc;
 880         u32 sar_buf = sh_dmae_readl(sh_chan, SAR);
 881         u32 dar_buf = sh_dmae_readl(sh_chan, DAR);
 882
 883         spin_lock(&sh_chan->desc_lock);
 884         list_for_each_entry(desc, &sh_chan->ld_queue, node) {
 885                 if (desc->mark == DESC_SUBMITTED &&
 886                     ((desc->direction == DMA_FROM_DEVICE &&
 887                       (desc->hw.dar + desc->hw.tcr) == dar_buf) ||
 888                      (desc->hw.sar + desc->hw.tcr) == sar_buf)) {
 889                         dev_dbg(sh_chan->dev, "done #%d@%p dst %u\n",
 890                                 desc->async_tx.cookie, &desc->async_tx,
 891                                 desc->hw.dar);
 892                         desc->mark = DESC_COMPLETED;
 893                         break;
 894                 }
 895         }
 896         spin_unlock(&sh_chan->desc_lock);
 897
 898         /* Next desc */
 899         sh_chan_xfer_ld_queue(sh_chan);
 900         sh_dmae_chan_ld_cleanup(sh_chan, false);
 901 }
 902
 903 static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev)
 904 {
 905         unsigned int handled;
 906
 907         /* Fast path out if NMIF is not asserted for this controller */
 908         if ((dmaor_read(shdev) & DMAOR_NMIF) == 0)
 909                 return false;
 910
 911         handled = sh_dmae_reset(shdev);
 912         if (handled)
 913                 return true;
 914
 915         return false;
 916 }
 917
 918 static int sh_dmae_nmi_handler(struct notifier_block *self,
 919                                unsigned long cmd, void *data)
 920 {
 921         struct sh_dmae_device *shdev;
 922         int ret = NOTIFY_DONE;
 923         bool triggered;
 924
 925         /*
 926          * Only concern ourselves with NMI events.
 927          *
 928          * Normally we would check the die chain value, but as this needs
 929          * to be architecture independent, check for NMI context instead.
 930          */
 931         if (!in_nmi())
 932                 return NOTIFY_DONE;
 933
 934         rcu_read_lock();
 935         list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) {
 936                 /*
 937                  * Only stop if one of the controllers has NMIF asserted,
 938                  * we do not want to interfere with regular address error
 939                  * handling or NMI events that don't concern the DMACs.
 940                  */
 941                 triggered = sh_dmae_nmi_notify(shdev);
 942                 if (triggered == true)
 943                         ret = NOTIFY_OK;
 944         }
 945         rcu_read_unlock();
 946
 947         return ret;
 948 }
 949
 950 static struct notifier_block sh_dmae_nmi_notifier __read_mostly = {
 951         .notifier_call  = sh_dmae_nmi_handler,
 952
 953         /* Run before NMI debug handler and KGDB */
 954         .priority       = 1,
 955 };
 956
 957 static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
 958                                         int irq, unsigned long flags)
 959 {
 960         int err;
 961         const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id];
 962         struct platform_device *pdev = to_platform_device(shdev->common.dev);
 963         struct sh_dmae_chan *new_sh_chan;
 964
 965         /* alloc channel */
 966         new_sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL);
 967         if (!new_sh_chan) {
 968                 dev_err(shdev->common.dev,
 969                         "No free memory for allocating dma channels!\n");
 970                 return -ENOMEM;
 971         }
 972
 973         /* copy struct dma_device */
 974         new_sh_chan->common.device = &shdev->common;
 975
 976         new_sh_chan->dev = shdev->common.dev;
 977         new_sh_chan->id = id;
 978         new_sh_chan->irq = irq;
 979         new_sh_chan->base = shdev->chan_reg + chan_pdata->offset / sizeof(u32);
 980
 981         /* Init DMA tasklet */
 982         tasklet_init(&new_sh_chan->tasklet, dmae_do_tasklet,
 983                         (unsigned long)new_sh_chan);
 984
 985         /* Init the channel */
 986         dmae_init(new_sh_chan);
 987
 988         spin_lock_init(&new_sh_chan->desc_lock);
 989
 990         /* Init descripter manage list */
 991         INIT_LIST_HEAD(&new_sh_chan->ld_queue);
 992         INIT_LIST_HEAD(&new_sh_chan->ld_free);
 993
 994         /* Add the channel to DMA device channel list */
 995         list_add_tail(&new_sh_chan->common.device_node,
 996                         &shdev->common.channels);
 997         shdev->common.chancnt++;
 998
 999         if (pdev->id >= 0)
1000                 snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
1001                          "sh-dmae%d.%d", pdev->id, new_sh_chan->id);
1002         else
1003                 snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
1004                          "sh-dma%d", new_sh_chan->id);
1005
1006         /* set up channel irq */
1007         err = request_irq(irq, &sh_dmae_interrupt, flags,
1008                           new_sh_chan->dev_id, new_sh_chan);
1009         if (err) {
1010                 dev_err(shdev->common.dev, "DMA channel %d request_irq error "
1011                         "with return %d\n", id, err);
1012                 goto err_no_irq;
1013         }
1014
1015         shdev->chan[id] = new_sh_chan;
1016         return 0;
1017
1018 err_no_irq:
1019         /* remove from dmaengine device node */
1020         list_del(&new_sh_chan->common.device_node);
1021         kfree(new_sh_chan);
1022         return err;
1023 }
1024
1025 static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
1026 {
1027         int i;
1028
1029         for (i = shdev->common.chancnt - 1 ; i >= 0 ; i--) {
1030                 if (shdev->chan[i]) {
1031                         struct sh_dmae_chan *sh_chan = shdev->chan[i];
1032
1033                         free_irq(sh_chan->irq, sh_chan);
1034
1035                         list_del(&sh_chan->common.device_node);
1036                         kfree(sh_chan);
1037                         shdev->chan[i] = NULL;
1038                 }
1039         }
1040         shdev->common.chancnt = 0;
1041 }
1042
1043 static int __init sh_dmae_probe(struct platform_device *pdev)
1044 {
1045         struct sh_dmae_pdata *pdata = pdev->dev.platform_data;
1046         unsigned long irqflags = IRQF_DISABLED,
1047                 chan_flag[SH_DMAC_MAX_CHANNELS] = {};
1048         unsigned long flags;
1049         int errirq, chan_irq[SH_DMAC_MAX_CHANNELS];
1050         int err, i, irq_cnt = 0, irqres = 0;
1051         struct sh_dmae_device *shdev;
1052         struct resource *chan, *dmars, *errirq_res, *chanirq_res;
1053
1054         /* get platform data */
1055         if (!pdata || !pdata->channel_num)
1056                 return -ENODEV;
1057
1058         chan = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1059         /* DMARS area is optional, if absent, this controller cannot do slave DMA */
1060         dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1061         /*
1062          * IRQ resources:
1063          * 1. there always must be at least one IRQ IO-resource. On SH4 it is
1064          *    the error IRQ, in which case it is the only IRQ in this resource:
1065          *    start == end. If it is the only IRQ resource, all channels also
1066          *    use the same IRQ.
1067          * 2. DMA channel IRQ resources can be specified one per resource or in
1068          *    ranges (start != end)
1069          * 3. iff all events (channels and, optionally, error) on this
1070          *    controller use the same IRQ, only one IRQ resource can be
1071          *    specified, otherwise there must be one IRQ per channel, even if
1072          *    some of them are equal
1073          * 4. if all IRQs on this controller are equal or if some specific IRQs
1074          *    specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be
1075          *    requested with the IRQF_SHARED flag
1076          */
1077         errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1078         if (!chan || !errirq_res)
1079                 return -ENODEV;
1080
1081         if (!request_mem_region(chan->start, resource_size(chan), pdev->name)) {
1082                 dev_err(&pdev->dev, "DMAC register region already claimed\n");
1083                 return -EBUSY;
1084         }
1085
1086         if (dmars && !request_mem_region(dmars->start, resource_size(dmars), pdev->name)) {
1087                 dev_err(&pdev->dev, "DMAC DMARS region already claimed\n");
1088                 err = -EBUSY;
1089                 goto ermrdmars;
1090         }
1091
1092         err = -ENOMEM;
1093         shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL);
1094         if (!shdev) {
1095                 dev_err(&pdev->dev, "Not enough memory\n");
1096                 goto ealloc;
1097         }
1098
1099         shdev->chan_reg = ioremap(chan->start, resource_size(chan));
1100         if (!shdev->chan_reg)
1101                 goto emapchan;
1102         if (dmars) {
1103                 shdev->dmars = ioremap(dmars->start, resource_size(dmars));
1104                 if (!shdev->dmars)
1105                         goto emapdmars;
1106         }
1107
1108         /* platform data */
1109         shdev->pdata = pdata;
1110
1111         pm_runtime_enable(&pdev->dev);
1112         pm_runtime_get_sync(&pdev->dev);
1113
1114         spin_lock_irqsave(&sh_dmae_lock, flags);
1115         list_add_tail_rcu(&shdev->node, &sh_dmae_devices);
1116         spin_unlock_irqrestore(&sh_dmae_lock, flags);
1117
1118         /* reset dma controller */
1119         err = sh_dmae_rst(shdev);
1120         if (err)
1121                 goto rst_err;
1122
1123         INIT_LIST_HEAD(&shdev->common.channels);
1124
1125         dma_cap_set(DMA_MEMCPY, shdev->common.cap_mask);
1126         if (dmars)
1127                 dma_cap_set(DMA_SLAVE, shdev->common.cap_mask);
1128
1129         shdev->common.device_alloc_chan_resources
1130                 = sh_dmae_alloc_chan_resources;
1131         shdev->common.device_free_chan_resources = sh_dmae_free_chan_resources;
1132         shdev->common.device_prep_dma_memcpy = sh_dmae_prep_memcpy;
1133         shdev->common.device_tx_status = sh_dmae_tx_status;
1134         shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending;
1135
1136         /* Compulsory for DMA_SLAVE fields */
1137         shdev->common.device_prep_slave_sg = sh_dmae_prep_slave_sg;
1138         shdev->common.device_control = sh_dmae_control;
1139
1140         shdev->common.dev = &pdev->dev;
1141         /* Default transfer size of 32 bytes requires 32-byte alignment */
1142         shdev->common.copy_align = LOG2_DEFAULT_XFER_SIZE;
1143
1144 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
1145         chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
1146
1147         if (!chanirq_res)
1148                 chanirq_res = errirq_res;
1149         else
1150                 irqres++;
1151
1152         if (chanirq_res == errirq_res ||
1153             (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE)
1154                 irqflags = IRQF_SHARED;
1155
1156         errirq = errirq_res->start;
1157
1158         err = request_irq(errirq, sh_dmae_err, irqflags,
1159                           "DMAC Address Error", shdev);
1160         if (err) {
1161                 dev_err(&pdev->dev,
1162                         "DMA failed requesting irq #%d, error %d\n",
1163                         errirq, err);
1164                 goto eirq_err;
1165         }
1166
1167 #else
1168         chanirq_res = errirq_res;
1169 #endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */
1170
1171         if (chanirq_res->start == chanirq_res->end &&
1172             !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) {
1173                 /* Special case - all multiplexed */
1174                 for (; irq_cnt < pdata->channel_num; irq_cnt++) {
1175                         chan_irq[irq_cnt] = chanirq_res->start;
1176                         chan_flag[irq_cnt] = IRQF_SHARED;
1177                 }
1178         } else {
1179                 do {
1180                         for (i = chanirq_res->start; i <= chanirq_res->end; i++) {
1181                                 if ((errirq_res->flags & IORESOURCE_BITS) ==
1182                                     IORESOURCE_IRQ_SHAREABLE)
1183                                         chan_flag[irq_cnt] = IRQF_SHARED;
1184                                 else
1185                                         chan_flag[irq_cnt] = IRQF_DISABLED;
1186                                 dev_dbg(&pdev->dev,
1187                                         "Found IRQ %d for channel %d\n",
1188                                         i, irq_cnt);
1189                                 chan_irq[irq_cnt++] = i;
1190                         }
1191                         chanirq_res = platform_get_resource(pdev,
1192                                                 IORESOURCE_IRQ, ++irqres);
1193                 } while (irq_cnt < pdata->channel_num && chanirq_res);
1194         }
1195
1196         if (irq_cnt < pdata->channel_num)
1197                 goto eirqres;
1198
1199         /* Create DMA Channel */
1200         for (i = 0; i < pdata->channel_num; i++) {
1201                 err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]);
1202                 if (err)
1203                         goto chan_probe_err;
1204         }
1205
1206         pm_runtime_put(&pdev->dev);
1207
1208         platform_set_drvdata(pdev, shdev);
1209         dma_async_device_register(&shdev->common);
1210
1211         return err;
1212
1213 chan_probe_err:
1214         sh_dmae_chan_remove(shdev);
1215 eirqres:
1216 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
1217         free_irq(errirq, shdev);
1218 eirq_err:
1219 #endif
1220 rst_err:
1221         spin_lock_irqsave(&sh_dmae_lock, flags);
1222         list_del_rcu(&shdev->node);
1223         spin_unlock_irqrestore(&sh_dmae_lock, flags);
1224
1225         pm_runtime_put(&pdev->dev);
1226         if (dmars)
1227                 iounmap(shdev->dmars);
1228 emapdmars:
1229         iounmap(shdev->chan_reg);
1230 emapchan:
1231         kfree(shdev);
1232 ealloc:
1233         if (dmars)
1234                 release_mem_region(dmars->start, resource_size(dmars));
1235 ermrdmars:
1236         release_mem_region(chan->start, resource_size(chan));
1237
1238         return err;
1239 }
1240
1241 static int __exit sh_dmae_remove(struct platform_device *pdev)
1242 {
1243         struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
1244         struct resource *res;
1245         unsigned long flags;
1246         int errirq = platform_get_irq(pdev, 0);
1247
1248         dma_async_device_unregister(&shdev->common);
1249
1250         if (errirq > 0)
1251                 free_irq(errirq, shdev);
1252
1253         spin_lock_irqsave(&sh_dmae_lock, flags);
1254         list_del_rcu(&shdev->node);
1255         spin_unlock_irqrestore(&sh_dmae_lock, flags);
1256
1257         /* channel data remove */
1258         sh_dmae_chan_remove(shdev);
1259
1260         pm_runtime_disable(&pdev->dev);
1261
1262         if (shdev->dmars)
1263                 iounmap(shdev->dmars);
1264         iounmap(shdev->chan_reg);
1265
1266         kfree(shdev);
1267
1268         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1269         if (res)
1270                 release_mem_region(res->start, resource_size(res));
1271         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1272         if (res)
1273                 release_mem_region(res->start, resource_size(res));
1274
1275         return 0;
1276 }
1277
1278 static void sh_dmae_shutdown(struct platform_device *pdev)
1279 {
1280         struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
1281         sh_dmae_ctl_stop(shdev);
1282 }
1283
1284 static struct platform_driver sh_dmae_driver = {
1285         .remove         = __exit_p(sh_dmae_remove),
1286         .shutdown       = sh_dmae_shutdown,
1287         .driver = {
1288                 .owner  = THIS_MODULE,
1289                 .name   = "sh-dma-engine",
1290         },
1291 };
1292
1293 static int __init sh_dmae_init(void)
1294 {
1295         /* Wire up NMI handling */
1296         int err = register_die_notifier(&sh_dmae_nmi_notifier);
1297         if (err)
1298                 return err;
1299
1300         return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe);
1301 }
1302 module_init(sh_dmae_init);
1303
1304 static void __exit sh_dmae_exit(void)
1305 {
1306         platform_driver_unregister(&sh_dmae_driver);
1307
1308         unregister_die_notifier(&sh_dmae_nmi_notifier);
1309 }
1310 module_exit(sh_dmae_exit);
1311
1312 MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>");
1313 MODULE_DESCRIPTION("Renesas SH DMA Engine driver");
1314 MODULE_LICENSE("GPL");
1315 MODULE_ALIAS("platform:sh-dma-engine");