drivers/dma/coh901318.c

   1 /*
   2  * driver/dma/coh901318.c
   3  *
   4  * Copyright (C) 2007-2009 ST-Ericsson
   5  * License terms: GNU General Public License (GPL) version 2
   6  * DMA driver for COH 901 318
   7  * Author: Per Friden <per.friden@stericsson.com>
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/kernel.h> /* printk() */
  13 #include <linux/fs.h> /* everything... */
  14 #include <linux/scatterlist.h>
  15 #include <linux/slab.h> /* kmalloc() */
  16 #include <linux/dmaengine.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/device.h>
  19 #include <linux/irqreturn.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/io.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/debugfs.h>
  24 #include <mach/coh901318.h>
  25
  26 #include "coh901318_lli.h"
  27 #include "dmaengine.h"
  28
  29 #define COHC_2_DEV(cohc) (&cohc->chan.dev->device)
  30
  31 #ifdef VERBOSE_DEBUG
  32 #define COH_DBG(x) ({ if (1) x; 0; })
  33 #else
  34 #define COH_DBG(x) ({ if (0) x; 0; })
  35 #endif
  36
  37 struct coh901318_desc {
  38         struct dma_async_tx_descriptor desc;
  39         struct list_head node;
  40         struct scatterlist *sg;
  41         unsigned int sg_len;
  42         struct coh901318_lli *lli;
  43         enum dma_transfer_direction dir;
  44         unsigned long flags;
  45         u32 head_config;
  46         u32 head_ctrl;
  47 };
  48
  49 struct coh901318_base {
  50         struct device *dev;
  51         void __iomem *virtbase;
  52         struct coh901318_pool pool;
  53         struct powersave pm;
  54         struct dma_device dma_slave;
  55         struct dma_device dma_memcpy;
  56         struct coh901318_chan *chans;
  57         struct coh901318_platform *platform;
  58 };
  59
  60 struct coh901318_chan {
  61         spinlock_t lock;
  62         int allocated;
  63         int id;
  64         int stopped;
  65
  66         struct work_struct free_work;
  67         struct dma_chan chan;
  68
  69         struct tasklet_struct tasklet;
  70
  71         struct list_head active;
  72         struct list_head queue;
  73         struct list_head free;
  74
  75         unsigned long nbr_active_done;
  76         unsigned long busy;
  77
  78         u32 runtime_addr;
  79         u32 runtime_ctrl;
  80
  81         struct coh901318_base *base;
  82 };
  83
  84 static void coh901318_list_print(struct coh901318_chan *cohc,
  85                                  struct coh901318_lli *lli)
  86 {
  87         struct coh901318_lli *l = lli;
  88         int i = 0;
  89
  90         while (l) {
  91                 dev_vdbg(COHC_2_DEV(cohc), "i %d, lli %p, ctrl 0x%x, src 0x%x"
  92                          ", dst 0x%x, link 0x%x virt_link_addr 0x%p\n",
  93                          i, l, l->control, l->src_addr, l->dst_addr,
  94                          l->link_addr, l->virt_link_addr);
  95                 i++;
  96                 l = l->virt_link_addr;
  97         }
  98 }
  99
 100 #ifdef CONFIG_DEBUG_FS
 101
 102 #define COH901318_DEBUGFS_ASSIGN(x, y) (x = y)
 103
 104 static struct coh901318_base *debugfs_dma_base;
 105 static struct dentry *dma_dentry;
 106
 107 static int coh901318_debugfs_open(struct inode *inode, struct file *file)
 108 {
 109
 110         file->private_data = inode->i_private;
 111         return 0;
 112 }
 113
 114 static int coh901318_debugfs_read(struct file *file, char __user *buf,
 115                                   size_t count, loff_t *f_pos)
 116 {
 117         u64 started_channels = debugfs_dma_base->pm.started_channels;
 118         int pool_count = debugfs_dma_base->pool.debugfs_pool_counter;
 119         int i;
 120         int ret = 0;
 121         char *dev_buf;
 122         char *tmp;
 123         int dev_size;
 124
 125         dev_buf = kmalloc(4*1024, GFP_KERNEL);
 126         if (dev_buf == NULL)
 127                 goto err_kmalloc;
 128         tmp = dev_buf;
 129
 130         tmp += sprintf(tmp, "DMA -- enabled dma channels\n");
 131
 132         for (i = 0; i < debugfs_dma_base->platform->max_channels; i++)
 133                 if (started_channels & (1 << i))
 134                         tmp += sprintf(tmp, "channel %d\n", i);
 135
 136         tmp += sprintf(tmp, "Pool alloc nbr %d\n", pool_count);
 137         dev_size = tmp  - dev_buf;
 138
 139         /* No more to read if offset != 0 */
 140         if (*f_pos > dev_size)
 141                 goto out;
 142
 143         if (count > dev_size - *f_pos)
 144                 count = dev_size - *f_pos;
 145
 146         if (copy_to_user(buf, dev_buf + *f_pos, count))
 147                 ret = -EINVAL;
 148         ret = count;
 149         *f_pos += count;
 150
 151  out:
 152         kfree(dev_buf);
 153         return ret;
 154
 155  err_kmalloc:
 156         return 0;
 157 }
 158
 159 static const struct file_operations coh901318_debugfs_status_operations = {
 160         .owner          = THIS_MODULE,
 161         .open           = coh901318_debugfs_open,
 162         .read           = coh901318_debugfs_read,
 163         .llseek         = default_llseek,
 164 };
 165
 166
 167 static int __init init_coh901318_debugfs(void)
 168 {
 169
 170         dma_dentry = debugfs_create_dir("dma", NULL);
 171
 172         (void) debugfs_create_file("status",
 173                                    S_IFREG | S_IRUGO,
 174                                    dma_dentry, NULL,
 175                                    &coh901318_debugfs_status_operations);
 176         return 0;
 177 }
 178
 179 static void __exit exit_coh901318_debugfs(void)
 180 {
 181         debugfs_remove_recursive(dma_dentry);
 182 }
 183
 184 module_init(init_coh901318_debugfs);
 185 module_exit(exit_coh901318_debugfs);
 186 #else
 187
 188 #define COH901318_DEBUGFS_ASSIGN(x, y)
 189
 190 #endif /* CONFIG_DEBUG_FS */
 191
 192 static inline struct coh901318_chan *to_coh901318_chan(struct dma_chan *chan)
 193 {
 194         return container_of(chan, struct coh901318_chan, chan);
 195 }
 196
 197 static inline dma_addr_t
 198 cohc_dev_addr(struct coh901318_chan *cohc)
 199 {
 200         /* Runtime supplied address will take precedence */
 201         if (cohc->runtime_addr)
 202                 return cohc->runtime_addr;
 203         return cohc->base->platform->chan_conf[cohc->id].dev_addr;
 204 }
 205
 206 static inline const struct coh901318_params *
 207 cohc_chan_param(struct coh901318_chan *cohc)
 208 {
 209         return &cohc->base->platform->chan_conf[cohc->id].param;
 210 }
 211
 212 static inline const struct coh_dma_channel *
 213 cohc_chan_conf(struct coh901318_chan *cohc)
 214 {
 215         return &cohc->base->platform->chan_conf[cohc->id];
 216 }
 217
 218 static void enable_powersave(struct coh901318_chan *cohc)
 219 {
 220         unsigned long flags;
 221         struct powersave *pm = &cohc->base->pm;
 222
 223         spin_lock_irqsave(&pm->lock, flags);
 224
 225         pm->started_channels &= ~(1ULL << cohc->id);
 226
 227         if (!pm->started_channels) {
 228                 /* DMA no longer intends to access memory */
 229                 cohc->base->platform->access_memory_state(cohc->base->dev,
 230                                                           false);
 231         }
 232
 233         spin_unlock_irqrestore(&pm->lock, flags);
 234 }
 235 static void disable_powersave(struct coh901318_chan *cohc)
 236 {
 237         unsigned long flags;
 238         struct powersave *pm = &cohc->base->pm;
 239
 240         spin_lock_irqsave(&pm->lock, flags);
 241
 242         if (!pm->started_channels) {
 243                 /* DMA intends to access memory */
 244                 cohc->base->platform->access_memory_state(cohc->base->dev,
 245                                                           true);
 246         }
 247
 248         pm->started_channels |= (1ULL << cohc->id);
 249
 250         spin_unlock_irqrestore(&pm->lock, flags);
 251 }
 252
 253 static inline int coh901318_set_ctrl(struct coh901318_chan *cohc, u32 control)
 254 {
 255         int channel = cohc->id;
 256         void __iomem *virtbase = cohc->base->virtbase;
 257
 258         writel(control,
 259                virtbase + COH901318_CX_CTRL +
 260                COH901318_CX_CTRL_SPACING * channel);
 261         return 0;
 262 }
 263
 264 static inline int coh901318_set_conf(struct coh901318_chan *cohc, u32 conf)
 265 {
 266         int channel = cohc->id;
 267         void __iomem *virtbase = cohc->base->virtbase;
 268
 269         writel(conf,
 270                virtbase + COH901318_CX_CFG +
 271                COH901318_CX_CFG_SPACING*channel);
 272         return 0;
 273 }
 274
 275
 276 static int coh901318_start(struct coh901318_chan *cohc)
 277 {
 278         u32 val;
 279         int channel = cohc->id;
 280         void __iomem *virtbase = cohc->base->virtbase;
 281
 282         disable_powersave(cohc);
 283
 284         val = readl(virtbase + COH901318_CX_CFG +
 285                     COH901318_CX_CFG_SPACING * channel);
 286
 287         /* Enable channel */
 288         val |= COH901318_CX_CFG_CH_ENABLE;
 289         writel(val, virtbase + COH901318_CX_CFG +
 290                COH901318_CX_CFG_SPACING * channel);
 291
 292         return 0;
 293 }
 294
 295 static int coh901318_prep_linked_list(struct coh901318_chan *cohc,
 296                                       struct coh901318_lli *lli)
 297 {
 298         int channel = cohc->id;
 299         void __iomem *virtbase = cohc->base->virtbase;
 300
 301         BUG_ON(readl(virtbase + COH901318_CX_STAT +
 302                      COH901318_CX_STAT_SPACING*channel) &
 303                COH901318_CX_STAT_ACTIVE);
 304
 305         writel(lli->src_addr,
 306                virtbase + COH901318_CX_SRC_ADDR +
 307                COH901318_CX_SRC_ADDR_SPACING * channel);
 308
 309         writel(lli->dst_addr, virtbase +
 310                COH901318_CX_DST_ADDR +
 311                COH901318_CX_DST_ADDR_SPACING * channel);
 312
 313         writel(lli->link_addr, virtbase + COH901318_CX_LNK_ADDR +
 314                COH901318_CX_LNK_ADDR_SPACING * channel);
 315
 316         writel(lli->control, virtbase + COH901318_CX_CTRL +
 317                COH901318_CX_CTRL_SPACING * channel);
 318
 319         return 0;
 320 }
 321
 322 static struct coh901318_desc *
 323 coh901318_desc_get(struct coh901318_chan *cohc)
 324 {
 325         struct coh901318_desc *desc;
 326
 327         if (list_empty(&cohc->free)) {
 328                 /* alloc new desc because we're out of used ones
 329                  * TODO: alloc a pile of descs instead of just one,
 330                  * avoid many small allocations.
 331                  */
 332                 desc = kzalloc(sizeof(struct coh901318_desc), GFP_NOWAIT);
 333                 if (desc == NULL)
 334                         goto out;
 335                 INIT_LIST_HEAD(&desc->node);
 336                 dma_async_tx_descriptor_init(&desc->desc, &cohc->chan);
 337         } else {
 338                 /* Reuse an old desc. */
 339                 desc = list_first_entry(&cohc->free,
 340                                         struct coh901318_desc,
 341                                         node);
 342                 list_del(&desc->node);
 343                 /* Initialize it a bit so it's not insane */
 344                 desc->sg = NULL;
 345                 desc->sg_len = 0;
 346                 desc->desc.callback = NULL;
 347                 desc->desc.callback_param = NULL;
 348         }
 349
 350  out:
 351         return desc;
 352 }
 353
 354 static void
 355 coh901318_desc_free(struct coh901318_chan *cohc, struct coh901318_desc *cohd)
 356 {
 357         list_add_tail(&cohd->node, &cohc->free);
 358 }
 359
 360 /* call with irq lock held */
 361 static void
 362 coh901318_desc_submit(struct coh901318_chan *cohc, struct coh901318_desc *desc)
 363 {
 364         list_add_tail(&desc->node, &cohc->active);
 365 }
 366
 367 static struct coh901318_desc *
 368 coh901318_first_active_get(struct coh901318_chan *cohc)
 369 {
 370         struct coh901318_desc *d;
 371
 372         if (list_empty(&cohc->active))
 373                 return NULL;
 374
 375         d = list_first_entry(&cohc->active,
 376                              struct coh901318_desc,
 377                              node);
 378         return d;
 379 }
 380
 381 static void
 382 coh901318_desc_remove(struct coh901318_desc *cohd)
 383 {
 384         list_del(&cohd->node);
 385 }
 386
 387 static void
 388 coh901318_desc_queue(struct coh901318_chan *cohc, struct coh901318_desc *desc)
 389 {
 390         list_add_tail(&desc->node, &cohc->queue);
 391 }
 392
 393 static struct coh901318_desc *
 394 coh901318_first_queued(struct coh901318_chan *cohc)
 395 {
 396         struct coh901318_desc *d;
 397
 398         if (list_empty(&cohc->queue))
 399                 return NULL;
 400
 401         d = list_first_entry(&cohc->queue,
 402                              struct coh901318_desc,
 403                              node);
 404         return d;
 405 }
 406
 407 static inline u32 coh901318_get_bytes_in_lli(struct coh901318_lli *in_lli)
 408 {
 409         struct coh901318_lli *lli = in_lli;
 410         u32 bytes = 0;
 411
 412         while (lli) {
 413                 bytes += lli->control & COH901318_CX_CTRL_TC_VALUE_MASK;
 414                 lli = lli->virt_link_addr;
 415         }
 416         return bytes;
 417 }
 418
 419 /*
 420  * Get the number of bytes left to transfer on this channel,
 421  * it is unwise to call this before stopping the channel for
 422  * absolute measures, but for a rough guess you can still call
 423  * it.
 424  */
 425 static u32 coh901318_get_bytes_left(struct dma_chan *chan)
 426 {
 427         struct coh901318_chan *cohc = to_coh901318_chan(chan);
 428         struct coh901318_desc *cohd;
 429         struct list_head *pos;
 430         unsigned long flags;
 431         u32 left = 0;
 432         int i = 0;
 433
 434         spin_lock_irqsave(&cohc->lock, flags);
 435
 436         /*
 437          * If there are many queued jobs, we iterate and add the
 438          * size of them all. We take a special look on the first
 439          * job though, since it is probably active.
 440          */
 441         list_for_each(pos, &cohc->active) {
 442                 /*
 443                  * The first job in the list will be working on the
 444                  * hardware. The job can be stopped but still active,
 445                  * so that the transfer counter is somewhere inside
 446                  * the buffer.
 447                  */
 448                 cohd = list_entry(pos, struct coh901318_desc, node);
 449
 450                 if (i == 0) {
 451                         struct coh901318_lli *lli;
 452                         dma_addr_t ladd;
 453
 454                         /* Read current transfer count value */
 455                         left = readl(cohc->base->virtbase +
 456                                      COH901318_CX_CTRL +
 457                                      COH901318_CX_CTRL_SPACING * cohc->id) &
 458                                 COH901318_CX_CTRL_TC_VALUE_MASK;
 459
 460                         /* See if the transfer is linked... */
 461                         ladd = readl(cohc->base->virtbase +
 462                                      COH901318_CX_LNK_ADDR +
 463                                      COH901318_CX_LNK_ADDR_SPACING *
 464                                      cohc->id) &
 465                                 ~COH901318_CX_LNK_LINK_IMMEDIATE;
 466                         /* Single transaction */
 467                         if (!ladd)
 468                                 continue;
 469
 470                         /*
 471                          * Linked transaction, follow the lli, find the
 472                          * currently processing lli, and proceed to the next
 473                          */
 474                         lli = cohd->lli;
 475                         while (lli && lli->link_addr != ladd)
 476                                 lli = lli->virt_link_addr;
 477
 478                         if (lli)
 479                                 lli = lli->virt_link_addr;
 480
 481                         /*
 482                          * Follow remaining lli links around to count the total
 483                          * number of bytes left
 484                          */
 485                         left += coh901318_get_bytes_in_lli(lli);
 486                 } else {
 487                         left += coh901318_get_bytes_in_lli(cohd->lli);
 488                 }
 489                 i++;
 490         }
 491
 492         /* Also count bytes in the queued jobs */
 493         list_for_each(pos, &cohc->queue) {
 494                 cohd = list_entry(pos, struct coh901318_desc, node);
 495                 left += coh901318_get_bytes_in_lli(cohd->lli);
 496         }
 497
 498         spin_unlock_irqrestore(&cohc->lock, flags);
 499
 500         return left;
 501 }
 502
 503 /*
 504  * Pauses a transfer without losing data. Enables power save.
 505  * Use this function in conjunction with coh901318_resume.
 506  */
 507 static void coh901318_pause(struct dma_chan *chan)
 508 {
 509         u32 val;
 510         unsigned long flags;
 511         struct coh901318_chan *cohc = to_coh901318_chan(chan);
 512         int channel = cohc->id;
 513         void __iomem *virtbase = cohc->base->virtbase;
 514
 515         spin_lock_irqsave(&cohc->lock, flags);
 516
 517         /* Disable channel in HW */
 518         val = readl(virtbase + COH901318_CX_CFG +
 519                     COH901318_CX_CFG_SPACING * channel);
 520
 521         /* Stopping infinite transfer */
 522         if ((val & COH901318_CX_CTRL_TC_ENABLE) == 0 &&
 523             (val & COH901318_CX_CFG_CH_ENABLE))
 524                 cohc->stopped = 1;
 525
 526
 527         val &= ~COH901318_CX_CFG_CH_ENABLE;
 528         /* Enable twice, HW bug work around */
 529         writel(val, virtbase + COH901318_CX_CFG +
 530                COH901318_CX_CFG_SPACING * channel);
 531         writel(val, virtbase + COH901318_CX_CFG +
 532                COH901318_CX_CFG_SPACING * channel);
 533
 534         /* Spin-wait for it to actually go inactive */
 535         while (readl(virtbase + COH901318_CX_STAT+COH901318_CX_STAT_SPACING *
 536                      channel) & COH901318_CX_STAT_ACTIVE)
 537                 cpu_relax();
 538
 539         /* Check if we stopped an active job */
 540         if ((readl(virtbase + COH901318_CX_CTRL+COH901318_CX_CTRL_SPACING *
 541                    channel) & COH901318_CX_CTRL_TC_VALUE_MASK) > 0)
 542                 cohc->stopped = 1;
 543
 544         enable_powersave(cohc);
 545
 546         spin_unlock_irqrestore(&cohc->lock, flags);
 547 }
 548
 549 /* Resumes a transfer that has been stopped via 300_dma_stop(..).
 550    Power save is handled.
 551 */
 552 static void coh901318_resume(struct dma_chan *chan)
 553 {
 554         u32 val;
 555         unsigned long flags;
 556         struct coh901318_chan *cohc = to_coh901318_chan(chan);
 557         int channel = cohc->id;
 558
 559         spin_lock_irqsave(&cohc->lock, flags);
 560
 561         disable_powersave(cohc);
 562
 563         if (cohc->stopped) {
 564                 /* Enable channel in HW */
 565                 val = readl(cohc->base->virtbase + COH901318_CX_CFG +
 566                             COH901318_CX_CFG_SPACING * channel);
 567
 568                 val |= COH901318_CX_CFG_CH_ENABLE;
 569
 570                 writel(val, cohc->base->virtbase + COH901318_CX_CFG +
 571                        COH901318_CX_CFG_SPACING*channel);
 572
 573                 cohc->stopped = 0;
 574         }
 575
 576         spin_unlock_irqrestore(&cohc->lock, flags);
 577 }
 578
 579 bool coh901318_filter_id(struct dma_chan *chan, void *chan_id)
 580 {
 581         unsigned int ch_nr = (unsigned int) chan_id;
 582
 583         if (ch_nr == to_coh901318_chan(chan)->id)
 584                 return true;
 585
 586         return false;
 587 }
 588 EXPORT_SYMBOL(coh901318_filter_id);
 589
 590 /*
 591  * DMA channel allocation
 592  */
 593 static int coh901318_config(struct coh901318_chan *cohc,
 594                             struct coh901318_params *param)
 595 {
 596         unsigned long flags;
 597         const struct coh901318_params *p;
 598         int channel = cohc->id;
 599         void __iomem *virtbase = cohc->base->virtbase;
 600
 601         spin_lock_irqsave(&cohc->lock, flags);
 602
 603         if (param)
 604                 p = param;
 605         else
 606                 p = &cohc->base->platform->chan_conf[channel].param;
 607
 608         /* Clear any pending BE or TC interrupt */
 609         if (channel < 32) {
 610                 writel(1 << channel, virtbase + COH901318_BE_INT_CLEAR1);
 611                 writel(1 << channel, virtbase + COH901318_TC_INT_CLEAR1);
 612         } else {
 613                 writel(1 << (channel - 32), virtbase +
 614                        COH901318_BE_INT_CLEAR2);
 615                 writel(1 << (channel - 32), virtbase +
 616                        COH901318_TC_INT_CLEAR2);
 617         }
 618
 619         coh901318_set_conf(cohc, p->config);
 620         coh901318_set_ctrl(cohc, p->ctrl_lli_last);
 621
 622         spin_unlock_irqrestore(&cohc->lock, flags);
 623
 624         return 0;
 625 }
 626
 627 /* must lock when calling this function
 628  * start queued jobs, if any
 629  * TODO: start all queued jobs in one go
 630  *
 631  * Returns descriptor if queued job is started otherwise NULL.
 632  * If the queue is empty NULL is returned.
 633  */
 634 static struct coh901318_desc *coh901318_queue_start(struct coh901318_chan *cohc)
 635 {
 636         struct coh901318_desc *cohd;
 637
 638         /*
 639          * start queued jobs, if any
 640          * TODO: transmit all queued jobs in one go
 641          */
 642         cohd = coh901318_first_queued(cohc);
 643
 644         if (cohd != NULL) {
 645                 /* Remove from queue */
 646                 coh901318_desc_remove(cohd);
 647                 /* initiate DMA job */
 648                 cohc->busy = 1;
 649
 650                 coh901318_desc_submit(cohc, cohd);
 651
 652                 /* Program the transaction head */
 653                 coh901318_set_conf(cohc, cohd->head_config);
 654                 coh901318_set_ctrl(cohc, cohd->head_ctrl);
 655                 coh901318_prep_linked_list(cohc, cohd->lli);
 656
 657                 /* start dma job on this channel */
 658                 coh901318_start(cohc);
 659
 660         }
 661
 662         return cohd;
 663 }
 664
 665 /*
 666  * This tasklet is called from the interrupt handler to
 667  * handle each descriptor (DMA job) that is sent to a channel.
 668  */
 669 static void dma_tasklet(unsigned long data)
 670 {
 671         struct coh901318_chan *cohc = (struct coh901318_chan *) data;
 672         struct coh901318_desc *cohd_fin;
 673         unsigned long flags;
 674         dma_async_tx_callback callback;
 675         void *callback_param;
 676
 677         dev_vdbg(COHC_2_DEV(cohc), "[%s] chan_id %d"
 678                  " nbr_active_done %ld\n", __func__,
 679                  cohc->id, cohc->nbr_active_done);
 680
 681         spin_lock_irqsave(&cohc->lock, flags);
 682
 683         /* get first active descriptor entry from list */
 684         cohd_fin = coh901318_first_active_get(cohc);
 685
 686         if (cohd_fin == NULL)
 687                 goto err;
 688
 689         /* locate callback to client */
 690         callback = cohd_fin->desc.callback;
 691         callback_param = cohd_fin->desc.callback_param;
 692
 693         /* sign this job as completed on the channel */
 694         dma_cookie_complete(&cohd_fin->desc);
 695
 696         /* release the lli allocation and remove the descriptor */
 697         coh901318_lli_free(&cohc->base->pool, &cohd_fin->lli);
 698
 699         /* return desc to free-list */
 700         coh901318_desc_remove(cohd_fin);
 701         coh901318_desc_free(cohc, cohd_fin);
 702
 703         spin_unlock_irqrestore(&cohc->lock, flags);
 704
 705         /* Call the callback when we're done */
 706         if (callback)
 707                 callback(callback_param);
 708
 709         spin_lock_irqsave(&cohc->lock, flags);
 710
 711         /*
 712          * If another interrupt fired while the tasklet was scheduling,
 713          * we don't get called twice, so we have this number of active
 714          * counter that keep track of the number of IRQs expected to
 715          * be handled for this channel. If there happen to be more than
 716          * one IRQ to be ack:ed, we simply schedule this tasklet again.
 717          */
 718         cohc->nbr_active_done--;
 719         if (cohc->nbr_active_done) {
 720                 dev_dbg(COHC_2_DEV(cohc), "scheduling tasklet again, new IRQs "
 721                         "came in while we were scheduling this tasklet\n");
 722                 if (cohc_chan_conf(cohc)->priority_high)
 723                         tasklet_hi_schedule(&cohc->tasklet);
 724                 else
 725                         tasklet_schedule(&cohc->tasklet);
 726         }
 727
 728         spin_unlock_irqrestore(&cohc->lock, flags);
 729
 730         return;
 731
 732  err:
 733         spin_unlock_irqrestore(&cohc->lock, flags);
 734         dev_err(COHC_2_DEV(cohc), "[%s] No active dma desc\n", __func__);
 735 }
 736
 737
 738 /* called from interrupt context */
 739 static void dma_tc_handle(struct coh901318_chan *cohc)
 740 {
 741         /*
 742          * If the channel is not allocated, then we shouldn't have
 743          * any TC interrupts on it.
 744          */
 745         if (!cohc->allocated) {
 746                 dev_err(COHC_2_DEV(cohc), "spurious interrupt from "
 747                         "unallocated channel\n");
 748                 return;
 749         }
 750
 751         spin_lock(&cohc->lock);
 752
 753         /*
 754          * When we reach this point, at least one queue item
 755          * should have been moved over from cohc->queue to
 756          * cohc->active and run to completion, that is why we're
 757          * getting a terminal count interrupt is it not?
 758          * If you get this BUG() the most probable cause is that
 759          * the individual nodes in the lli chain have IRQ enabled,
 760          * so check your platform config for lli chain ctrl.
 761          */
 762         BUG_ON(list_empty(&cohc->active));
 763
 764         cohc->nbr_active_done++;
 765
 766         /*
 767          * This attempt to take a job from cohc->queue, put it
 768          * into cohc->active and start it.
 769          */
 770         if (coh901318_queue_start(cohc) == NULL)
 771                 cohc->busy = 0;
 772
 773         spin_unlock(&cohc->lock);
 774
 775         /*
 776          * This tasklet will remove items from cohc->active
 777          * and thus terminates them.
 778          */
 779         if (cohc_chan_conf(cohc)->priority_high)
 780                 tasklet_hi_schedule(&cohc->tasklet);
 781         else
 782                 tasklet_schedule(&cohc->tasklet);
 783 }
 784
 785
 786 static irqreturn_t dma_irq_handler(int irq, void *dev_id)
 787 {
 788         u32 status1;
 789         u32 status2;
 790         int i;
 791         int ch;
 792         struct coh901318_base *base  = dev_id;
 793         struct coh901318_chan *cohc;
 794         void __iomem *virtbase = base->virtbase;
 795
 796         status1 = readl(virtbase + COH901318_INT_STATUS1);
 797         status2 = readl(virtbase + COH901318_INT_STATUS2);
 798
 799         if (unlikely(status1 == 0 && status2 == 0)) {
 800                 dev_warn(base->dev, "spurious DMA IRQ from no channel!\n");
 801                 return IRQ_HANDLED;
 802         }
 803
 804         /* TODO: consider handle IRQ in tasklet here to
 805          *       minimize interrupt latency */
 806
 807         /* Check the first 32 DMA channels for IRQ */
 808         while (status1) {
 809                 /* Find first bit set, return as a number. */
 810                 i = ffs(status1) - 1;
 811                 ch = i;
 812
 813                 cohc = &base->chans[ch];
 814                 spin_lock(&cohc->lock);
 815
 816                 /* Mask off this bit */
 817                 status1 &= ~(1 << i);
 818                 /* Check the individual channel bits */
 819                 if (test_bit(i, virtbase + COH901318_BE_INT_STATUS1)) {
 820                         dev_crit(COHC_2_DEV(cohc),
 821                                  "DMA bus error on channel %d!\n", ch);
 822                         BUG_ON(1);
 823                         /* Clear BE interrupt */
 824                         __set_bit(i, virtbase + COH901318_BE_INT_CLEAR1);
 825                 } else {
 826                         /* Caused by TC, really? */
 827                         if (unlikely(!test_bit(i, virtbase +
 828                                                COH901318_TC_INT_STATUS1))) {
 829                                 dev_warn(COHC_2_DEV(cohc),
 830                                          "ignoring interrupt not caused by terminal count on channel %d\n", ch);
 831                                 /* Clear TC interrupt */
 832                                 BUG_ON(1);
 833                                 __set_bit(i, virtbase + COH901318_TC_INT_CLEAR1);
 834                         } else {
 835                                 /* Enable powersave if transfer has finished */
 836                                 if (!(readl(virtbase + COH901318_CX_STAT +
 837                                             COH901318_CX_STAT_SPACING*ch) &
 838                                       COH901318_CX_STAT_ENABLED)) {
 839                                         enable_powersave(cohc);
 840                                 }
 841
 842                                 /* Must clear TC interrupt before calling
 843                                  * dma_tc_handle
 844                                  * in case tc_handle initiate a new dma job
 845                                  */
 846                                 __set_bit(i, virtbase + COH901318_TC_INT_CLEAR1);
 847
 848                                 dma_tc_handle(cohc);
 849                         }
 850                 }
 851                 spin_unlock(&cohc->lock);
 852         }
 853
 854         /* Check the remaining 32 DMA channels for IRQ */
 855         while (status2) {
 856                 /* Find first bit set, return as a number. */
 857                 i = ffs(status2) - 1;
 858                 ch = i + 32;
 859                 cohc = &base->chans[ch];
 860                 spin_lock(&cohc->lock);
 861
 862                 /* Mask off this bit */
 863                 status2 &= ~(1 << i);
 864                 /* Check the individual channel bits */
 865                 if (test_bit(i, virtbase + COH901318_BE_INT_STATUS2)) {
 866                         dev_crit(COHC_2_DEV(cohc),
 867                                  "DMA bus error on channel %d!\n", ch);
 868                         /* Clear BE interrupt */
 869                         BUG_ON(1);
 870                         __set_bit(i, virtbase + COH901318_BE_INT_CLEAR2);
 871                 } else {
 872                         /* Caused by TC, really? */
 873                         if (unlikely(!test_bit(i, virtbase +
 874                                                COH901318_TC_INT_STATUS2))) {
 875                                 dev_warn(COHC_2_DEV(cohc),
 876                                          "ignoring interrupt not caused by terminal count on channel %d\n", ch);
 877                                 /* Clear TC interrupt */
 878                                 __set_bit(i, virtbase + COH901318_TC_INT_CLEAR2);
 879                                 BUG_ON(1);
 880                         } else {
 881                                 /* Enable powersave if transfer has finished */
 882                                 if (!(readl(virtbase + COH901318_CX_STAT +
 883                                             COH901318_CX_STAT_SPACING*ch) &
 884                                       COH901318_CX_STAT_ENABLED)) {
 885                                         enable_powersave(cohc);
 886                                 }
 887                                 /* Must clear TC interrupt before calling
 888                                  * dma_tc_handle
 889                                  * in case tc_handle initiate a new dma job
 890                                  */
 891                                 __set_bit(i, virtbase + COH901318_TC_INT_CLEAR2);
 892
 893                                 dma_tc_handle(cohc);
 894                         }
 895                 }
 896                 spin_unlock(&cohc->lock);
 897         }
 898
 899         return IRQ_HANDLED;
 900 }
 901
 902 static int coh901318_alloc_chan_resources(struct dma_chan *chan)
 903 {
 904         struct coh901318_chan   *cohc = to_coh901318_chan(chan);
 905         unsigned long flags;
 906
 907         dev_vdbg(COHC_2_DEV(cohc), "[%s] DMA channel %d\n",
 908                  __func__, cohc->id);
 909
 910         if (chan->client_count > 1)
 911                 return -EBUSY;
 912
 913         spin_lock_irqsave(&cohc->lock, flags);
 914
 915         coh901318_config(cohc, NULL);
 916
 917         cohc->allocated = 1;
 918         dma_cookie_init(chan);
 919
 920         spin_unlock_irqrestore(&cohc->lock, flags);
 921
 922         return 1;
 923 }
 924
 925 static void
 926 coh901318_free_chan_resources(struct dma_chan *chan)
 927 {
 928         struct coh901318_chan   *cohc = to_coh901318_chan(chan);
 929         int channel = cohc->id;
 930         unsigned long flags;
 931
 932         spin_lock_irqsave(&cohc->lock, flags);
 933
 934         /* Disable HW */
 935         writel(0x00000000U, cohc->base->virtbase + COH901318_CX_CFG +
 936                COH901318_CX_CFG_SPACING*channel);
 937         writel(0x00000000U, cohc->base->virtbase + COH901318_CX_CTRL +
 938                COH901318_CX_CTRL_SPACING*channel);
 939
 940         cohc->allocated = 0;
 941
 942         spin_unlock_irqrestore(&cohc->lock, flags);
 943
 944         chan->device->device_control(chan, DMA_TERMINATE_ALL, 0);
 945 }
 946
 947
 948 static dma_cookie_t
 949 coh901318_tx_submit(struct dma_async_tx_descriptor *tx)
 950 {
 951         struct coh901318_desc *cohd = container_of(tx, struct coh901318_desc,
 952                                                    desc);
 953         struct coh901318_chan *cohc = to_coh901318_chan(tx->chan);
 954         unsigned long flags;
 955         dma_cookie_t cookie;
 956
 957         spin_lock_irqsave(&cohc->lock, flags);
 958         cookie = dma_cookie_assign(tx);
 959
 960         coh901318_desc_queue(cohc, cohd);
 961
 962         spin_unlock_irqrestore(&cohc->lock, flags);
 963
 964         return cookie;
 965 }
 966
 967 static struct dma_async_tx_descriptor *
 968 coh901318_prep_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
 969                       size_t size, unsigned long flags)
 970 {
 971         struct coh901318_lli *lli;
 972         struct coh901318_desc *cohd;
 973         unsigned long flg;
 974         struct coh901318_chan *cohc = to_coh901318_chan(chan);
 975         int lli_len;
 976         u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last;
 977         int ret;
 978
 979         spin_lock_irqsave(&cohc->lock, flg);
 980
 981         dev_vdbg(COHC_2_DEV(cohc),
 982                  "[%s] channel %d src 0x%x dest 0x%x size %d\n",
 983                  __func__, cohc->id, src, dest, size);
 984
 985         if (flags & DMA_PREP_INTERRUPT)
 986                 /* Trigger interrupt after last lli */
 987                 ctrl_last |= COH901318_CX_CTRL_TC_IRQ_ENABLE;
 988
 989         lli_len = size >> MAX_DMA_PACKET_SIZE_SHIFT;
 990         if ((lli_len << MAX_DMA_PACKET_SIZE_SHIFT) < size)
 991                 lli_len++;
 992
 993         lli = coh901318_lli_alloc(&cohc->base->pool, lli_len);
 994
 995         if (lli == NULL)
 996                 goto err;
 997
 998         ret = coh901318_lli_fill_memcpy(
 999                 &cohc->base->pool, lli, src, size, dest,
1000                 cohc_chan_param(cohc)->ctrl_lli_chained,
1001                 ctrl_last);
1002         if (ret)
1003                 goto err;
1004
1005         COH_DBG(coh901318_list_print(cohc, lli));
1006
1007         /* Pick a descriptor to handle this transfer */
1008         cohd = coh901318_desc_get(cohc);
1009         cohd->lli = lli;
1010         cohd->flags = flags;
1011         cohd->desc.tx_submit = coh901318_tx_submit;
1012
1013         spin_unlock_irqrestore(&cohc->lock, flg);
1014
1015         return &cohd->desc;
1016  err:
1017         spin_unlock_irqrestore(&cohc->lock, flg);
1018         return NULL;
1019 }
1020
1021 static struct dma_async_tx_descriptor *
1022 coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
1023                         unsigned int sg_len, enum dma_transfer_direction direction,
1024                         unsigned long flags, void *context)
1025 {
1026         struct coh901318_chan *cohc = to_coh901318_chan(chan);
1027         struct coh901318_lli *lli;
1028         struct coh901318_desc *cohd;
1029         const struct coh901318_params *params;
1030         struct scatterlist *sg;
1031         int len = 0;
1032         int size;
1033         int i;
1034         u32 ctrl_chained = cohc_chan_param(cohc)->ctrl_lli_chained;
1035         u32 ctrl = cohc_chan_param(cohc)->ctrl_lli;
1036         u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last;
1037         u32 config;
1038         unsigned long flg;
1039         int ret;
1040
1041         if (!sgl)
1042                 goto out;
1043         if (sgl->length == 0)
1044                 goto out;
1045
1046         spin_lock_irqsave(&cohc->lock, flg);
1047
1048         dev_vdbg(COHC_2_DEV(cohc), "[%s] sg_len %d dir %d\n",
1049                  __func__, sg_len, direction);
1050
1051         if (flags & DMA_PREP_INTERRUPT)
1052                 /* Trigger interrupt after last lli */
1053                 ctrl_last |= COH901318_CX_CTRL_TC_IRQ_ENABLE;
1054
1055         params = cohc_chan_param(cohc);
1056         config = params->config;
1057         /*
1058          * Add runtime-specific control on top, make
1059          * sure the bits you set per peripheral channel are
1060          * cleared in the default config from the platform.
1061          */
1062         ctrl_chained |= cohc->runtime_ctrl;
1063         ctrl_last |= cohc->runtime_ctrl;
1064         ctrl |= cohc->runtime_ctrl;
1065
1066         if (direction == DMA_MEM_TO_DEV) {
1067                 u32 tx_flags = COH901318_CX_CTRL_PRDD_SOURCE |
1068                         COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE;
1069
1070                 config |= COH901318_CX_CFG_RM_MEMORY_TO_PRIMARY;
1071                 ctrl_chained |= tx_flags;
1072                 ctrl_last |= tx_flags;
1073                 ctrl |= tx_flags;
1074         } else if (direction == DMA_DEV_TO_MEM) {
1075                 u32 rx_flags = COH901318_CX_CTRL_PRDD_DEST |
1076                         COH901318_CX_CTRL_DST_ADDR_INC_ENABLE;
1077
1078                 config |= COH901318_CX_CFG_RM_PRIMARY_TO_MEMORY;
1079                 ctrl_chained |= rx_flags;
1080                 ctrl_last |= rx_flags;
1081                 ctrl |= rx_flags;
1082         } else
1083                 goto err_direction;
1084
1085         /* The dma only supports transmitting packages up to
1086          * MAX_DMA_PACKET_SIZE. Calculate to total number of
1087          * dma elemts required to send the entire sg list
1088          */
1089         for_each_sg(sgl, sg, sg_len, i) {
1090                 unsigned int factor;
1091                 size = sg_dma_len(sg);
1092
1093                 if (size <= MAX_DMA_PACKET_SIZE) {
1094                         len++;
1095                         continue;
1096                 }
1097
1098                 factor = size >> MAX_DMA_PACKET_SIZE_SHIFT;
1099                 if ((factor << MAX_DMA_PACKET_SIZE_SHIFT) < size)
1100                         factor++;
1101
1102                 len += factor;
1103         }
1104
1105         pr_debug("Allocate %d lli:s for this transfer\n", len);
1106         lli = coh901318_lli_alloc(&cohc->base->pool, len);
1107
1108         if (lli == NULL)
1109                 goto err_dma_alloc;
1110
1111         /* initiate allocated lli list */
1112         ret = coh901318_lli_fill_sg(&cohc->base->pool, lli, sgl, sg_len,
1113                                     cohc_dev_addr(cohc),
1114                                     ctrl_chained,
1115                                     ctrl,
1116                                     ctrl_last,
1117                                     direction, COH901318_CX_CTRL_TC_IRQ_ENABLE);
1118         if (ret)
1119                 goto err_lli_fill;
1120
1121
1122         COH_DBG(coh901318_list_print(cohc, lli));
1123
1124         /* Pick a descriptor to handle this transfer */
1125         cohd = coh901318_desc_get(cohc);
1126         cohd->head_config = config;
1127         /*
1128          * Set the default head ctrl for the channel to the one from the
1129          * lli, things may have changed due to odd buffer alignment
1130          * etc.
1131          */
1132         cohd->head_ctrl = lli->control;
1133         cohd->dir = direction;
1134         cohd->flags = flags;
1135         cohd->desc.tx_submit = coh901318_tx_submit;
1136         cohd->lli = lli;
1137
1138         spin_unlock_irqrestore(&cohc->lock, flg);
1139
1140         return &cohd->desc;
1141  err_lli_fill:
1142  err_dma_alloc:
1143  err_direction:
1144         spin_unlock_irqrestore(&cohc->lock, flg);
1145  out:
1146         return NULL;
1147 }
1148
1149 static enum dma_status
1150 coh901318_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
1151                  struct dma_tx_state *txstate)
1152 {
1153         struct coh901318_chan *cohc = to_coh901318_chan(chan);
1154         enum dma_status ret;
1155
1156         ret = dma_cookie_status(chan, cookie, txstate);
1157         /* FIXME: should be conditional on ret != DMA_SUCCESS? */
1158         dma_set_residue(txstate, coh901318_get_bytes_left(chan));
1159
1160         if (ret == DMA_IN_PROGRESS && cohc->stopped)
1161                 ret = DMA_PAUSED;
1162
1163         return ret;
1164 }
1165
1166 static void
1167 coh901318_issue_pending(struct dma_chan *chan)
1168 {
1169         struct coh901318_chan *cohc = to_coh901318_chan(chan);
1170         unsigned long flags;
1171
1172         spin_lock_irqsave(&cohc->lock, flags);
1173
1174         /*
1175          * Busy means that pending jobs are already being processed,
1176          * and then there is no point in starting the queue: the
1177          * terminal count interrupt on the channel will take the next
1178          * job on the queue and execute it anyway.
1179          */
1180         if (!cohc->busy)
1181                 coh901318_queue_start(cohc);
1182
1183         spin_unlock_irqrestore(&cohc->lock, flags);
1184 }
1185
1186 /*
1187  * Here we wrap in the runtime dma control interface
1188  */
1189 struct burst_table {
1190         int burst_8bit;
1191         int burst_16bit;
1192         int burst_32bit;
1193         u32 reg;
1194 };
1195
1196 static const struct burst_table burst_sizes[] = {
1197         {
1198                 .burst_8bit = 64,
1199                 .burst_16bit = 32,
1200                 .burst_32bit = 16,
1201                 .reg = COH901318_CX_CTRL_BURST_COUNT_64_BYTES,
1202         },
1203         {
1204                 .burst_8bit = 48,
1205                 .burst_16bit = 24,
1206                 .burst_32bit = 12,
1207                 .reg = COH901318_CX_CTRL_BURST_COUNT_48_BYTES,
1208         },
1209         {
1210                 .burst_8bit = 32,
1211                 .burst_16bit = 16,
1212                 .burst_32bit = 8,
1213                 .reg = COH901318_CX_CTRL_BURST_COUNT_32_BYTES,
1214         },
1215         {
1216                 .burst_8bit = 16,
1217                 .burst_16bit = 8,
1218                 .burst_32bit = 4,
1219                 .reg = COH901318_CX_CTRL_BURST_COUNT_16_BYTES,
1220         },
1221         {
1222                 .burst_8bit = 8,
1223                 .burst_16bit = 4,
1224                 .burst_32bit = 2,
1225                 .reg = COH901318_CX_CTRL_BURST_COUNT_8_BYTES,
1226         },
1227         {
1228                 .burst_8bit = 4,
1229                 .burst_16bit = 2,
1230                 .burst_32bit = 1,
1231                 .reg = COH901318_CX_CTRL_BURST_COUNT_4_BYTES,
1232         },
1233         {
1234                 .burst_8bit = 2,
1235                 .burst_16bit = 1,
1236                 .burst_32bit = 0,
1237                 .reg = COH901318_CX_CTRL_BURST_COUNT_2_BYTES,
1238         },
1239         {
1240                 .burst_8bit = 1,
1241                 .burst_16bit = 0,
1242                 .burst_32bit = 0,
1243                 .reg = COH901318_CX_CTRL_BURST_COUNT_1_BYTE,
1244         },
1245 };
1246
1247 static void coh901318_dma_set_runtimeconfig(struct dma_chan *chan,
1248                         struct dma_slave_config *config)
1249 {
1250         struct coh901318_chan *cohc = to_coh901318_chan(chan);
1251         dma_addr_t addr;
1252         enum dma_slave_buswidth addr_width;
1253         u32 maxburst;
1254         u32 runtime_ctrl = 0;
1255         int i = 0;
1256
1257         /* We only support mem to per or per to mem transfers */
1258         if (config->direction == DMA_DEV_TO_MEM) {
1259                 addr = config->src_addr;
1260                 addr_width = config->src_addr_width;
1261                 maxburst = config->src_maxburst;
1262         } else if (config->direction == DMA_MEM_TO_DEV) {
1263                 addr = config->dst_addr;
1264                 addr_width = config->dst_addr_width;
1265                 maxburst = config->dst_maxburst;
1266         } else {
1267                 dev_err(COHC_2_DEV(cohc), "illegal channel mode\n");
1268                 return;
1269         }
1270
1271         dev_dbg(COHC_2_DEV(cohc), "configure channel for %d byte transfers\n",
1272                 addr_width);
1273         switch (addr_width)  {
1274         case DMA_SLAVE_BUSWIDTH_1_BYTE:
1275                 runtime_ctrl |=
1276                         COH901318_CX_CTRL_SRC_BUS_SIZE_8_BITS |
1277                         COH901318_CX_CTRL_DST_BUS_SIZE_8_BITS;
1278
1279                 while (i < ARRAY_SIZE(burst_sizes)) {
1280                         if (burst_sizes[i].burst_8bit <= maxburst)
1281                                 break;
1282                         i++;
1283                 }
1284
1285                 break;
1286         case DMA_SLAVE_BUSWIDTH_2_BYTES:
1287                 runtime_ctrl |=
1288                         COH901318_CX_CTRL_SRC_BUS_SIZE_16_BITS |
1289                         COH901318_CX_CTRL_DST_BUS_SIZE_16_BITS;
1290
1291                 while (i < ARRAY_SIZE(burst_sizes)) {
1292                         if (burst_sizes[i].burst_16bit <= maxburst)
1293                                 break;
1294                         i++;
1295                 }
1296
1297                 break;
1298         case DMA_SLAVE_BUSWIDTH_4_BYTES:
1299                 /* Direction doesn't matter here, it's 32/32 bits */
1300                 runtime_ctrl |=
1301                         COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS |
1302                         COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS;
1303
1304                 while (i < ARRAY_SIZE(burst_sizes)) {
1305                         if (burst_sizes[i].burst_32bit <= maxburst)
1306                                 break;
1307                         i++;
1308                 }
1309
1310                 break;
1311         default:
1312                 dev_err(COHC_2_DEV(cohc),
1313                         "bad runtimeconfig: alien address width\n");
1314                 return;
1315         }
1316
1317         runtime_ctrl |= burst_sizes[i].reg;
1318         dev_dbg(COHC_2_DEV(cohc),
1319                 "selected burst size %d bytes for address width %d bytes, maxburst %d\n",
1320                 burst_sizes[i].burst_8bit, addr_width, maxburst);
1321
1322         cohc->runtime_addr = addr;
1323         cohc->runtime_ctrl = runtime_ctrl;
1324 }
1325
1326 static int
1327 coh901318_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
1328                   unsigned long arg)
1329 {
1330         unsigned long flags;
1331         struct coh901318_chan *cohc = to_coh901318_chan(chan);
1332         struct coh901318_desc *cohd;
1333         void __iomem *virtbase = cohc->base->virtbase;
1334
1335         if (cmd == DMA_SLAVE_CONFIG) {
1336                 struct dma_slave_config *config =
1337                         (struct dma_slave_config *) arg;
1338
1339                 coh901318_dma_set_runtimeconfig(chan, config);
1340                 return 0;
1341           }
1342
1343         if (cmd == DMA_PAUSE) {
1344                 coh901318_pause(chan);
1345                 return 0;
1346         }
1347
1348         if (cmd == DMA_RESUME) {
1349                 coh901318_resume(chan);
1350                 return 0;
1351         }
1352
1353         if (cmd != DMA_TERMINATE_ALL)
1354                 return -ENXIO;
1355
1356         /* The remainder of this function terminates the transfer */
1357         coh901318_pause(chan);
1358         spin_lock_irqsave(&cohc->lock, flags);
1359
1360         /* Clear any pending BE or TC interrupt */
1361         if (cohc->id < 32) {
1362                 writel(1 << cohc->id, virtbase + COH901318_BE_INT_CLEAR1);
1363                 writel(1 << cohc->id, virtbase + COH901318_TC_INT_CLEAR1);
1364         } else {
1365                 writel(1 << (cohc->id - 32), virtbase +
1366                        COH901318_BE_INT_CLEAR2);
1367                 writel(1 << (cohc->id - 32), virtbase +
1368                        COH901318_TC_INT_CLEAR2);
1369         }
1370
1371         enable_powersave(cohc);
1372
1373         while ((cohd = coh901318_first_active_get(cohc))) {
1374                 /* release the lli allocation*/
1375                 coh901318_lli_free(&cohc->base->pool, &cohd->lli);
1376
1377                 /* return desc to free-list */
1378                 coh901318_desc_remove(cohd);
1379                 coh901318_desc_free(cohc, cohd);
1380         }
1381
1382         while ((cohd = coh901318_first_queued(cohc))) {
1383                 /* release the lli allocation*/
1384                 coh901318_lli_free(&cohc->base->pool, &cohd->lli);
1385
1386                 /* return desc to free-list */
1387                 coh901318_desc_remove(cohd);
1388                 coh901318_desc_free(cohc, cohd);
1389         }
1390
1391
1392         cohc->nbr_active_done = 0;
1393         cohc->busy = 0;
1394
1395         spin_unlock_irqrestore(&cohc->lock, flags);
1396
1397         return 0;
1398 }
1399
1400 void coh901318_base_init(struct dma_device *dma, const int *pick_chans,
1401                          struct coh901318_base *base)
1402 {
1403         int chans_i;
1404         int i = 0;
1405         struct coh901318_chan *cohc;
1406
1407         INIT_LIST_HEAD(&dma->channels);
1408
1409         for (chans_i = 0; pick_chans[chans_i] != -1; chans_i += 2) {
1410                 for (i = pick_chans[chans_i]; i <= pick_chans[chans_i+1]; i++) {
1411                         cohc = &base->chans[i];
1412
1413                         cohc->base = base;
1414                         cohc->chan.device = dma;
1415                         cohc->id = i;
1416
1417                         /* TODO: do we really need this lock if only one
1418                          * client is connected to each channel?
1419                          */
1420
1421                         spin_lock_init(&cohc->lock);
1422
1423                         cohc->nbr_active_done = 0;
1424                         cohc->busy = 0;
1425                         INIT_LIST_HEAD(&cohc->free);
1426                         INIT_LIST_HEAD(&cohc->active);
1427                         INIT_LIST_HEAD(&cohc->queue);
1428
1429                         tasklet_init(&cohc->tasklet, dma_tasklet,
1430                                      (unsigned long) cohc);
1431
1432                         list_add_tail(&cohc->chan.device_node,
1433                                       &dma->channels);
1434                 }
1435         }
1436 }
1437
1438 static int __init coh901318_probe(struct platform_device *pdev)
1439 {
1440         int err = 0;
1441         struct coh901318_platform *pdata;
1442         struct coh901318_base *base;
1443         int irq;
1444         struct resource *io;
1445
1446         io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1447         if (!io)
1448                 goto err_get_resource;
1449
1450         /* Map DMA controller registers to virtual memory */
1451         if (request_mem_region(io->start,
1452                                resource_size(io),
1453                                pdev->dev.driver->name) == NULL) {
1454                 err = -EBUSY;
1455                 goto err_request_mem;
1456         }
1457
1458         pdata = pdev->dev.platform_data;
1459         if (!pdata)
1460                 goto err_no_platformdata;
1461
1462         base = kmalloc(ALIGN(sizeof(struct coh901318_base), 4) +
1463                        pdata->max_channels *
1464                        sizeof(struct coh901318_chan),
1465                        GFP_KERNEL);
1466         if (!base)
1467                 goto err_alloc_coh_dma_channels;
1468
1469         base->chans = ((void *)base) + ALIGN(sizeof(struct coh901318_base), 4);
1470
1471         base->virtbase = ioremap(io->start, resource_size(io));
1472         if (!base->virtbase) {
1473                 err = -ENOMEM;
1474                 goto err_no_ioremap;
1475         }
1476
1477         base->dev = &pdev->dev;
1478         base->platform = pdata;
1479         spin_lock_init(&base->pm.lock);
1480         base->pm.started_channels = 0;
1481
1482         COH901318_DEBUGFS_ASSIGN(debugfs_dma_base, base);
1483
1484         platform_set_drvdata(pdev, base);
1485
1486         irq = platform_get_irq(pdev, 0);
1487         if (irq < 0)
1488                 goto err_no_irq;
1489
1490         err = request_irq(irq, dma_irq_handler, IRQF_DISABLED,
1491                           "coh901318", base);
1492         if (err) {
1493                 dev_crit(&pdev->dev,
1494                          "Cannot allocate IRQ for DMA controller!\n");
1495                 goto err_request_irq;
1496         }
1497
1498         err = coh901318_pool_create(&base->pool, &pdev->dev,
1499                                     sizeof(struct coh901318_lli),
1500                                     32);
1501         if (err)
1502                 goto err_pool_create;
1503
1504         /* init channels for device transfers */
1505         coh901318_base_init(&base->dma_slave,  base->platform->chans_slave,
1506                             base);
1507
1508         dma_cap_zero(base->dma_slave.cap_mask);
1509         dma_cap_set(DMA_SLAVE, base->dma_slave.cap_mask);
1510
1511         base->dma_slave.device_alloc_chan_resources = coh901318_alloc_chan_resources;
1512         base->dma_slave.device_free_chan_resources = coh901318_free_chan_resources;
1513         base->dma_slave.device_prep_slave_sg = coh901318_prep_slave_sg;
1514         base->dma_slave.device_tx_status = coh901318_tx_status;
1515         base->dma_slave.device_issue_pending = coh901318_issue_pending;
1516         base->dma_slave.device_control = coh901318_control;
1517         base->dma_slave.dev = &pdev->dev;
1518
1519         err = dma_async_device_register(&base->dma_slave);
1520
1521         if (err)
1522                 goto err_register_slave;
1523
1524         /* init channels for memcpy */
1525         coh901318_base_init(&base->dma_memcpy, base->platform->chans_memcpy,
1526                             base);
1527
1528         dma_cap_zero(base->dma_memcpy.cap_mask);
1529         dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask);
1530
1531         base->dma_memcpy.device_alloc_chan_resources = coh901318_alloc_chan_resources;
1532         base->dma_memcpy.device_free_chan_resources = coh901318_free_chan_resources;
1533         base->dma_memcpy.device_prep_dma_memcpy = coh901318_prep_memcpy;
1534         base->dma_memcpy.device_tx_status = coh901318_tx_status;
1535         base->dma_memcpy.device_issue_pending = coh901318_issue_pending;
1536         base->dma_memcpy.device_control = coh901318_control;
1537         base->dma_memcpy.dev = &pdev->dev;
1538         /*
1539          * This controller can only access address at even 32bit boundaries,
1540          * i.e. 2^2
1541          */
1542         base->dma_memcpy.copy_align = 2;
1543         err = dma_async_device_register(&base->dma_memcpy);
1544
1545         if (err)
1546                 goto err_register_memcpy;
1547
1548         dev_info(&pdev->dev, "Initialized COH901318 DMA on virtual base 0x%08x\n",
1549                 (u32) base->virtbase);
1550
1551         return err;
1552
1553  err_register_memcpy:
1554         dma_async_device_unregister(&base->dma_slave);
1555  err_register_slave:
1556         coh901318_pool_destroy(&base->pool);
1557  err_pool_create:
1558         free_irq(platform_get_irq(pdev, 0), base);
1559  err_request_irq:
1560  err_no_irq:
1561         iounmap(base->virtbase);
1562  err_no_ioremap:
1563         kfree(base);
1564  err_alloc_coh_dma_channels:
1565  err_no_platformdata:
1566         release_mem_region(pdev->resource->start,
1567                            resource_size(pdev->resource));
1568  err_request_mem:
1569  err_get_resource:
1570         return err;
1571 }
1572
1573 static int __exit coh901318_remove(struct platform_device *pdev)
1574 {
1575         struct coh901318_base *base = platform_get_drvdata(pdev);
1576
1577         dma_async_device_unregister(&base->dma_memcpy);
1578         dma_async_device_unregister(&base->dma_slave);
1579         coh901318_pool_destroy(&base->pool);
1580         free_irq(platform_get_irq(pdev, 0), base);
1581         iounmap(base->virtbase);
1582         kfree(base);
1583         release_mem_region(pdev->resource->start,
1584                            resource_size(pdev->resource));
1585         return 0;
1586 }
1587
1588
1589 static struct platform_driver coh901318_driver = {
1590         .remove = __exit_p(coh901318_remove),
1591         .driver = {
1592                 .name   = "coh901318",
1593         },
1594 };
1595
1596 int __init coh901318_init(void)
1597 {
1598         return platform_driver_probe(&coh901318_driver, coh901318_probe);
1599 }
1600 subsys_initcall(coh901318_init);
1601
1602 void __exit coh901318_exit(void)
1603 {
1604         platform_driver_unregister(&coh901318_driver);
1605 }
1606 module_exit(coh901318_exit);
1607
1608 MODULE_LICENSE("GPL");
1609 MODULE_AUTHOR("Per Friden");