drivers/dma/k3dma.c

   1 /*
   2  * Copyright (c) 2013 - 2015 Linaro Ltd.
   3  * Copyright (c) 2013 Hisilicon Limited.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9 #include <linux/sched.h>
  10 #include <linux/device.h>
  11 #include <linux/dma-mapping.h>
  12 #include <linux/dmapool.h>
  13 #include <linux/dmaengine.h>
  14 #include <linux/init.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/slab.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/of_device.h>
  22 #include <linux/of.h>
  23 #include <linux/clk.h>
  24 #include <linux/of_dma.h>
  25
  26 #include "virt-dma.h"
  27
  28 #define DRIVER_NAME             "k3-dma"
  29 #define DMA_MAX_SIZE            0x1ffc
  30 #define DMA_CYCLIC_MAX_PERIOD   0x1000
  31 #define LLI_BLOCK_SIZE          (4 * PAGE_SIZE)
  32
  33 #define INT_STAT                0x00
  34 #define INT_TC1                 0x04
  35 #define INT_TC2                 0x08
  36 #define INT_ERR1                0x0c
  37 #define INT_ERR2                0x10
  38 #define INT_TC1_MASK            0x18
  39 #define INT_TC2_MASK            0x1c
  40 #define INT_ERR1_MASK           0x20
  41 #define INT_ERR2_MASK           0x24
  42 #define INT_TC1_RAW             0x600
  43 #define INT_TC2_RAW             0x608
  44 #define INT_ERR1_RAW            0x610
  45 #define INT_ERR2_RAW            0x618
  46 #define CH_PRI                  0x688
  47 #define CH_STAT                 0x690
  48 #define CX_CUR_CNT              0x704
  49 #define CX_LLI                  0x800
  50 #define CX_CNT1                 0x80c
  51 #define CX_CNT0                 0x810
  52 #define CX_SRC                  0x814
  53 #define CX_DST                  0x818
  54 #define CX_CFG                  0x81c
  55 #define AXI_CFG                 0x820
  56 #define AXI_CFG_DEFAULT         0x201201
  57
  58 #define CX_LLI_CHAIN_EN         0x2
  59 #define CX_CFG_EN               0x1
  60 #define CX_CFG_NODEIRQ          BIT(1)
  61 #define CX_CFG_MEM2PER          (0x1 << 2)
  62 #define CX_CFG_PER2MEM          (0x2 << 2)
  63 #define CX_CFG_SRCINCR          (0x1 << 31)
  64 #define CX_CFG_DSTINCR          (0x1 << 30)
  65
  66 struct k3_desc_hw {
  67         u32 lli;
  68         u32 reserved[3];
  69         u32 count;
  70         u32 saddr;
  71         u32 daddr;
  72         u32 config;
  73 } __aligned(32);
  74
  75 struct k3_dma_desc_sw {
  76         struct virt_dma_desc    vd;
  77         dma_addr_t              desc_hw_lli;
  78         size_t                  desc_num;
  79         size_t                  size;
  80         struct k3_desc_hw       *desc_hw;
  81 };
  82
  83 struct k3_dma_phy;
  84
  85 struct k3_dma_chan {
  86         u32                     ccfg;
  87         struct virt_dma_chan    vc;
  88         struct k3_dma_phy       *phy;
  89         struct list_head        node;
  90         enum dma_transfer_direction dir;
  91         dma_addr_t              dev_addr;
  92         enum dma_status         status;
  93         bool                    cyclic;
  94 };
  95
  96 struct k3_dma_phy {
  97         u32                     idx;
  98         void __iomem            *base;
  99         struct k3_dma_chan      *vchan;
 100         struct k3_dma_desc_sw   *ds_run;
 101         struct k3_dma_desc_sw   *ds_done;
 102 };
 103
 104 struct k3_dma_dev {
 105         struct dma_device       slave;
 106         void __iomem            *base;
 107         struct tasklet_struct   task;
 108         spinlock_t              lock;
 109         struct list_head        chan_pending;
 110         struct k3_dma_phy       *phy;
 111         struct k3_dma_chan      *chans;
 112         struct clk              *clk;
 113         struct dma_pool         *pool;
 114         u32                     dma_channels;
 115         u32                     dma_requests;
 116         unsigned int            irq;
 117 };
 118
 119 #define to_k3_dma(dmadev) container_of(dmadev, struct k3_dma_dev, slave)
 120
 121 static struct k3_dma_chan *to_k3_chan(struct dma_chan *chan)
 122 {
 123         return container_of(chan, struct k3_dma_chan, vc.chan);
 124 }
 125
 126 static void k3_dma_pause_dma(struct k3_dma_phy *phy, bool on)
 127 {
 128         u32 val = 0;
 129
 130         if (on) {
 131                 val = readl_relaxed(phy->base + CX_CFG);
 132                 val |= CX_CFG_EN;
 133                 writel_relaxed(val, phy->base + CX_CFG);
 134         } else {
 135                 val = readl_relaxed(phy->base + CX_CFG);
 136                 val &= ~CX_CFG_EN;
 137                 writel_relaxed(val, phy->base + CX_CFG);
 138         }
 139 }
 140
 141 static void k3_dma_terminate_chan(struct k3_dma_phy *phy, struct k3_dma_dev *d)
 142 {
 143         u32 val = 0;
 144
 145         k3_dma_pause_dma(phy, false);
 146
 147         val = 0x1 << phy->idx;
 148         writel_relaxed(val, d->base + INT_TC1_RAW);
 149         writel_relaxed(val, d->base + INT_TC2_RAW);
 150         writel_relaxed(val, d->base + INT_ERR1_RAW);
 151         writel_relaxed(val, d->base + INT_ERR2_RAW);
 152 }
 153
 154 static void k3_dma_set_desc(struct k3_dma_phy *phy, struct k3_desc_hw *hw)
 155 {
 156         writel_relaxed(hw->lli, phy->base + CX_LLI);
 157         writel_relaxed(hw->count, phy->base + CX_CNT0);
 158         writel_relaxed(hw->saddr, phy->base + CX_SRC);
 159         writel_relaxed(hw->daddr, phy->base + CX_DST);
 160         writel_relaxed(AXI_CFG_DEFAULT, phy->base + AXI_CFG);
 161         writel_relaxed(hw->config, phy->base + CX_CFG);
 162 }
 163
 164 static u32 k3_dma_get_curr_cnt(struct k3_dma_dev *d, struct k3_dma_phy *phy)
 165 {
 166         u32 cnt = 0;
 167
 168         cnt = readl_relaxed(d->base + CX_CUR_CNT + phy->idx * 0x10);
 169         cnt &= 0xffff;
 170         return cnt;
 171 }
 172
 173 static u32 k3_dma_get_curr_lli(struct k3_dma_phy *phy)
 174 {
 175         return readl_relaxed(phy->base + CX_LLI);
 176 }
 177
 178 static u32 k3_dma_get_chan_stat(struct k3_dma_dev *d)
 179 {
 180         return readl_relaxed(d->base + CH_STAT);
 181 }
 182
 183 static void k3_dma_enable_dma(struct k3_dma_dev *d, bool on)
 184 {
 185         if (on) {
 186                 /* set same priority */
 187                 writel_relaxed(0x0, d->base + CH_PRI);
 188
 189                 /* unmask irq */
 190                 writel_relaxed(0xffff, d->base + INT_TC1_MASK);
 191                 writel_relaxed(0xffff, d->base + INT_TC2_MASK);
 192                 writel_relaxed(0xffff, d->base + INT_ERR1_MASK);
 193                 writel_relaxed(0xffff, d->base + INT_ERR2_MASK);
 194         } else {
 195                 /* mask irq */
 196                 writel_relaxed(0x0, d->base + INT_TC1_MASK);
 197                 writel_relaxed(0x0, d->base + INT_TC2_MASK);
 198                 writel_relaxed(0x0, d->base + INT_ERR1_MASK);
 199                 writel_relaxed(0x0, d->base + INT_ERR2_MASK);
 200         }
 201 }
 202
 203 static irqreturn_t k3_dma_int_handler(int irq, void *dev_id)
 204 {
 205         struct k3_dma_dev *d = (struct k3_dma_dev *)dev_id;
 206         struct k3_dma_phy *p;
 207         struct k3_dma_chan *c;
 208         u32 stat = readl_relaxed(d->base + INT_STAT);
 209         u32 tc1  = readl_relaxed(d->base + INT_TC1);
 210         u32 tc2  = readl_relaxed(d->base + INT_TC2);
 211         u32 err1 = readl_relaxed(d->base + INT_ERR1);
 212         u32 err2 = readl_relaxed(d->base + INT_ERR2);
 213         u32 i, irq_chan = 0;
 214
 215         while (stat) {
 216                 i = __ffs(stat);
 217                 stat &= ~BIT(i);
 218                 if (likely(tc1 & BIT(i)) || (tc2 & BIT(i))) {
 219                         unsigned long flags;
 220
 221                         p = &d->phy[i];
 222                         c = p->vchan;
 223                         if (c && (tc1 & BIT(i))) {
 224                                 spin_lock_irqsave(&c->vc.lock, flags);
 225                                 if (p->ds_run != NULL) {
 226                                         vchan_cookie_complete(&p->ds_run->vd);
 227                                         p->ds_done = p->ds_run;
 228                                         p->ds_run = NULL;
 229                                 }
 230                                 spin_unlock_irqrestore(&c->vc.lock, flags);
 231                         }
 232                         if (c && (tc2 & BIT(i))) {
 233                                 spin_lock_irqsave(&c->vc.lock, flags);
 234                                 if (p->ds_run != NULL)
 235                                         vchan_cyclic_callback(&p->ds_run->vd);
 236                                 spin_unlock_irqrestore(&c->vc.lock, flags);
 237                         }
 238                         irq_chan |= BIT(i);
 239                 }
 240                 if (unlikely((err1 & BIT(i)) || (err2 & BIT(i))))
 241                         dev_warn(d->slave.dev, "DMA ERR\n");
 242         }
 243
 244         writel_relaxed(irq_chan, d->base + INT_TC1_RAW);
 245         writel_relaxed(irq_chan, d->base + INT_TC2_RAW);
 246         writel_relaxed(err1, d->base + INT_ERR1_RAW);
 247         writel_relaxed(err2, d->base + INT_ERR2_RAW);
 248
 249         if (irq_chan)
 250                 tasklet_schedule(&d->task);
 251
 252         if (irq_chan || err1 || err2)
 253                 return IRQ_HANDLED;
 254
 255         return IRQ_NONE;
 256 }
 257
 258 static int k3_dma_start_txd(struct k3_dma_chan *c)
 259 {
 260         struct k3_dma_dev *d = to_k3_dma(c->vc.chan.device);
 261         struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
 262
 263         if (!c->phy)
 264                 return -EAGAIN;
 265
 266         if (BIT(c->phy->idx) & k3_dma_get_chan_stat(d))
 267                 return -EAGAIN;
 268
 269         /* Avoid losing track of  ds_run if a transaction is in flight */
 270         if (c->phy->ds_run)
 271                 return -EAGAIN;
 272
 273         if (vd) {
 274                 struct k3_dma_desc_sw *ds =
 275                         container_of(vd, struct k3_dma_desc_sw, vd);
 276                 /*
 277                  * fetch and remove request from vc->desc_issued
 278                  * so vc->desc_issued only contains desc pending
 279                  */
 280                 list_del(&ds->vd.node);
 281
 282                 c->phy->ds_run = ds;
 283                 c->phy->ds_done = NULL;
 284                 /* start dma */
 285                 k3_dma_set_desc(c->phy, &ds->desc_hw[0]);
 286                 return 0;
 287         }
 288         c->phy->ds_run = NULL;
 289         c->phy->ds_done = NULL;
 290         return -EAGAIN;
 291 }
 292
 293 static void k3_dma_tasklet(unsigned long arg)
 294 {
 295         struct k3_dma_dev *d = (struct k3_dma_dev *)arg;
 296         struct k3_dma_phy *p;
 297         struct k3_dma_chan *c, *cn;
 298         unsigned pch, pch_alloc = 0;
 299
 300         /* check new dma request of running channel in vc->desc_issued */
 301         list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) {
 302                 spin_lock_irq(&c->vc.lock);
 303                 p = c->phy;
 304                 if (p && p->ds_done) {
 305                         if (k3_dma_start_txd(c)) {
 306                                 /* No current txd associated with this channel */
 307                                 dev_dbg(d->slave.dev, "pchan %u: free\n", p->idx);
 308                                 /* Mark this channel free */
 309                                 c->phy = NULL;
 310                                 p->vchan = NULL;
 311                         }
 312                 }
 313                 spin_unlock_irq(&c->vc.lock);
 314         }
 315
 316         /* check new channel request in d->chan_pending */
 317         spin_lock_irq(&d->lock);
 318         for (pch = 0; pch < d->dma_channels; pch++) {
 319                 p = &d->phy[pch];
 320
 321                 if (p->vchan == NULL && !list_empty(&d->chan_pending)) {
 322                         c = list_first_entry(&d->chan_pending,
 323                                 struct k3_dma_chan, node);
 324                         /* remove from d->chan_pending */
 325                         list_del_init(&c->node);
 326                         pch_alloc |= 1 << pch;
 327                         /* Mark this channel allocated */
 328                         p->vchan = c;
 329                         c->phy = p;
 330                         dev_dbg(d->slave.dev, "pchan %u: alloc vchan %p\n", pch, &c->vc);
 331                 }
 332         }
 333         spin_unlock_irq(&d->lock);
 334
 335         for (pch = 0; pch < d->dma_channels; pch++) {
 336                 if (pch_alloc & (1 << pch)) {
 337                         p = &d->phy[pch];
 338                         c = p->vchan;
 339                         if (c) {
 340                                 spin_lock_irq(&c->vc.lock);
 341                                 k3_dma_start_txd(c);
 342                                 spin_unlock_irq(&c->vc.lock);
 343                         }
 344                 }
 345         }
 346 }
 347
 348 static void k3_dma_free_chan_resources(struct dma_chan *chan)
 349 {
 350         struct k3_dma_chan *c = to_k3_chan(chan);
 351         struct k3_dma_dev *d = to_k3_dma(chan->device);
 352         unsigned long flags;
 353
 354         spin_lock_irqsave(&d->lock, flags);
 355         list_del_init(&c->node);
 356         spin_unlock_irqrestore(&d->lock, flags);
 357
 358         vchan_free_chan_resources(&c->vc);
 359         c->ccfg = 0;
 360 }
 361
 362 static enum dma_status k3_dma_tx_status(struct dma_chan *chan,
 363         dma_cookie_t cookie, struct dma_tx_state *state)
 364 {
 365         struct k3_dma_chan *c = to_k3_chan(chan);
 366         struct k3_dma_dev *d = to_k3_dma(chan->device);
 367         struct k3_dma_phy *p;
 368         struct virt_dma_desc *vd;
 369         unsigned long flags;
 370         enum dma_status ret;
 371         size_t bytes = 0;
 372
 373         ret = dma_cookie_status(&c->vc.chan, cookie, state);
 374         if (ret == DMA_COMPLETE)
 375                 return ret;
 376
 377         spin_lock_irqsave(&c->vc.lock, flags);
 378         p = c->phy;
 379         ret = c->status;
 380
 381         /*
 382          * If the cookie is on our issue queue, then the residue is
 383          * its total size.
 384          */
 385         vd = vchan_find_desc(&c->vc, cookie);
 386         if (vd && !c->cyclic) {
 387                 bytes = container_of(vd, struct k3_dma_desc_sw, vd)->size;
 388         } else if ((!p) || (!p->ds_run)) {
 389                 bytes = 0;
 390         } else {
 391                 struct k3_dma_desc_sw *ds = p->ds_run;
 392                 u32 clli = 0, index = 0;
 393
 394                 bytes = k3_dma_get_curr_cnt(d, p);
 395                 clli = k3_dma_get_curr_lli(p);
 396                 index = ((clli - ds->desc_hw_lli) /
 397                                 sizeof(struct k3_desc_hw)) + 1;
 398                 for (; index < ds->desc_num; index++) {
 399                         bytes += ds->desc_hw[index].count;
 400                         /* end of lli */
 401                         if (!ds->desc_hw[index].lli)
 402                                 break;
 403                 }
 404         }
 405         spin_unlock_irqrestore(&c->vc.lock, flags);
 406         dma_set_residue(state, bytes);
 407         return ret;
 408 }
 409
 410 static void k3_dma_issue_pending(struct dma_chan *chan)
 411 {
 412         struct k3_dma_chan *c = to_k3_chan(chan);
 413         struct k3_dma_dev *d = to_k3_dma(chan->device);
 414         unsigned long flags;
 415
 416         spin_lock_irqsave(&c->vc.lock, flags);
 417         /* add request to vc->desc_issued */
 418         if (vchan_issue_pending(&c->vc)) {
 419                 spin_lock(&d->lock);
 420                 if (!c->phy) {
 421                         if (list_empty(&c->node)) {
 422                                 /* if new channel, add chan_pending */
 423                                 list_add_tail(&c->node, &d->chan_pending);
 424                                 /* check in tasklet */
 425                                 tasklet_schedule(&d->task);
 426                                 dev_dbg(d->slave.dev, "vchan %p: issued\n", &c->vc);
 427                         }
 428                 }
 429                 spin_unlock(&d->lock);
 430         } else
 431                 dev_dbg(d->slave.dev, "vchan %p: nothing to issue\n", &c->vc);
 432         spin_unlock_irqrestore(&c->vc.lock, flags);
 433 }
 434
 435 static void k3_dma_fill_desc(struct k3_dma_desc_sw *ds, dma_addr_t dst,
 436                         dma_addr_t src, size_t len, u32 num, u32 ccfg)
 437 {
 438         if (num != ds->desc_num - 1)
 439                 ds->desc_hw[num].lli = ds->desc_hw_lli + (num + 1) *
 440                         sizeof(struct k3_desc_hw);
 441
 442         ds->desc_hw[num].lli |= CX_LLI_CHAIN_EN;
 443         ds->desc_hw[num].count = len;
 444         ds->desc_hw[num].saddr = src;
 445         ds->desc_hw[num].daddr = dst;
 446         ds->desc_hw[num].config = ccfg;
 447 }
 448
 449 static struct k3_dma_desc_sw *k3_dma_alloc_desc_resource(int num,
 450                                                         struct dma_chan *chan)
 451 {
 452         struct k3_dma_chan *c = to_k3_chan(chan);
 453         struct k3_dma_desc_sw *ds;
 454         struct k3_dma_dev *d = to_k3_dma(chan->device);
 455         int lli_limit = LLI_BLOCK_SIZE / sizeof(struct k3_desc_hw);
 456
 457         if (num > lli_limit) {
 458                 dev_dbg(chan->device->dev, "vch %p: sg num %d exceed max %d\n",
 459                         &c->vc, num, lli_limit);
 460                 return NULL;
 461         }
 462
 463         ds = kzalloc(sizeof(*ds), GFP_NOWAIT);
 464         if (!ds)
 465                 return NULL;
 466
 467         ds->desc_hw = dma_pool_zalloc(d->pool, GFP_NOWAIT, &ds->desc_hw_lli);
 468         if (!ds->desc_hw) {
 469                 dev_dbg(chan->device->dev, "vch %p: dma alloc fail\n", &c->vc);
 470                 kfree(ds);
 471                 return NULL;
 472         }
 473         ds->desc_num = num;
 474         return ds;
 475 }
 476
 477 static struct dma_async_tx_descriptor *k3_dma_prep_memcpy(
 478         struct dma_chan *chan,  dma_addr_t dst, dma_addr_t src,
 479         size_t len, unsigned long flags)
 480 {
 481         struct k3_dma_chan *c = to_k3_chan(chan);
 482         struct k3_dma_desc_sw *ds;
 483         size_t copy = 0;
 484         int num = 0;
 485
 486         if (!len)
 487                 return NULL;
 488
 489         num = DIV_ROUND_UP(len, DMA_MAX_SIZE);
 490
 491         ds = k3_dma_alloc_desc_resource(num, chan);
 492         if (!ds)
 493                 return NULL;
 494
 495         c->cyclic = 0;
 496         ds->size = len;
 497         num = 0;
 498
 499         if (!c->ccfg) {
 500                 /* default is memtomem, without calling device_config */
 501                 c->ccfg = CX_CFG_SRCINCR | CX_CFG_DSTINCR | CX_CFG_EN;
 502                 c->ccfg |= (0xf << 20) | (0xf << 24);   /* burst = 16 */
 503                 c->ccfg |= (0x3 << 12) | (0x3 << 16);   /* width = 64 bit */
 504         }
 505
 506         do {
 507                 copy = min_t(size_t, len, DMA_MAX_SIZE);
 508                 k3_dma_fill_desc(ds, dst, src, copy, num++, c->ccfg);
 509
 510                 if (c->dir == DMA_MEM_TO_DEV) {
 511                         src += copy;
 512                 } else if (c->dir == DMA_DEV_TO_MEM) {
 513                         dst += copy;
 514                 } else {
 515                         src += copy;
 516                         dst += copy;
 517                 }
 518                 len -= copy;
 519         } while (len);
 520
 521         ds->desc_hw[num-1].lli = 0;     /* end of link */
 522         return vchan_tx_prep(&c->vc, &ds->vd, flags);
 523 }
 524
 525 static struct dma_async_tx_descriptor *k3_dma_prep_slave_sg(
 526         struct dma_chan *chan, struct scatterlist *sgl, unsigned int sglen,
 527         enum dma_transfer_direction dir, unsigned long flags, void *context)
 528 {
 529         struct k3_dma_chan *c = to_k3_chan(chan);
 530         struct k3_dma_desc_sw *ds;
 531         size_t len, avail, total = 0;
 532         struct scatterlist *sg;
 533         dma_addr_t addr, src = 0, dst = 0;
 534         int num = sglen, i;
 535
 536         if (sgl == NULL)
 537                 return NULL;
 538
 539         c->cyclic = 0;
 540
 541         for_each_sg(sgl, sg, sglen, i) {
 542                 avail = sg_dma_len(sg);
 543                 if (avail > DMA_MAX_SIZE)
 544                         num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1;
 545         }
 546
 547         ds = k3_dma_alloc_desc_resource(num, chan);
 548         if (!ds)
 549                 return NULL;
 550         num = 0;
 551
 552         for_each_sg(sgl, sg, sglen, i) {
 553                 addr = sg_dma_address(sg);
 554                 avail = sg_dma_len(sg);
 555                 total += avail;
 556
 557                 do {
 558                         len = min_t(size_t, avail, DMA_MAX_SIZE);
 559
 560                         if (dir == DMA_MEM_TO_DEV) {
 561                                 src = addr;
 562                                 dst = c->dev_addr;
 563                         } else if (dir == DMA_DEV_TO_MEM) {
 564                                 src = c->dev_addr;
 565                                 dst = addr;
 566                         }
 567
 568                         k3_dma_fill_desc(ds, dst, src, len, num++, c->ccfg);
 569
 570                         addr += len;
 571                         avail -= len;
 572                 } while (avail);
 573         }
 574
 575         ds->desc_hw[num-1].lli = 0;     /* end of link */
 576         ds->size = total;
 577         return vchan_tx_prep(&c->vc, &ds->vd, flags);
 578 }
 579
 580 static struct dma_async_tx_descriptor *
 581 k3_dma_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr,
 582                        size_t buf_len, size_t period_len,
 583                        enum dma_transfer_direction dir,
 584                        unsigned long flags)
 585 {
 586         struct k3_dma_chan *c = to_k3_chan(chan);
 587         struct k3_dma_desc_sw *ds;
 588         size_t len, avail, total = 0;
 589         dma_addr_t addr, src = 0, dst = 0;
 590         int num = 1, since = 0;
 591         size_t modulo = DMA_CYCLIC_MAX_PERIOD;
 592         u32 en_tc2 = 0;
 593
 594         dev_dbg(chan->device->dev, "%s: buf %pad, dst %pad, buf len %zu, period_len = %zu, dir %d\n",
 595                __func__, &buf_addr, &to_k3_chan(chan)->dev_addr,
 596                buf_len, period_len, (int)dir);
 597
 598         avail = buf_len;
 599         if (avail > modulo)
 600                 num += DIV_ROUND_UP(avail, modulo) - 1;
 601
 602         ds = k3_dma_alloc_desc_resource(num, chan);
 603         if (!ds)
 604                 return NULL;
 605
 606         c->cyclic = 1;
 607         addr = buf_addr;
 608         avail = buf_len;
 609         total = avail;
 610         num = 0;
 611
 612         if (period_len < modulo)
 613                 modulo = period_len;
 614
 615         do {
 616                 len = min_t(size_t, avail, modulo);
 617
 618                 if (dir == DMA_MEM_TO_DEV) {
 619                         src = addr;
 620                         dst = c->dev_addr;
 621                 } else if (dir == DMA_DEV_TO_MEM) {
 622                         src = c->dev_addr;
 623                         dst = addr;
 624                 }
 625                 since += len;
 626                 if (since >= period_len) {
 627                         /* descriptor asks for TC2 interrupt on completion */
 628                         en_tc2 = CX_CFG_NODEIRQ;
 629                         since -= period_len;
 630                 } else
 631                         en_tc2 = 0;
 632
 633                 k3_dma_fill_desc(ds, dst, src, len, num++, c->ccfg | en_tc2);
 634
 635                 addr += len;
 636                 avail -= len;
 637         } while (avail);
 638
 639         /* "Cyclic" == end of link points back to start of link */
 640         ds->desc_hw[num - 1].lli |= ds->desc_hw_lli;
 641
 642         ds->size = total;
 643
 644         return vchan_tx_prep(&c->vc, &ds->vd, flags);
 645 }
 646
 647 static int k3_dma_config(struct dma_chan *chan,
 648                          struct dma_slave_config *cfg)
 649 {
 650         struct k3_dma_chan *c = to_k3_chan(chan);
 651         u32 maxburst = 0, val = 0;
 652         enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
 653
 654         if (cfg == NULL)
 655                 return -EINVAL;
 656         c->dir = cfg->direction;
 657         if (c->dir == DMA_DEV_TO_MEM) {
 658                 c->ccfg = CX_CFG_DSTINCR;
 659                 c->dev_addr = cfg->src_addr;
 660                 maxburst = cfg->src_maxburst;
 661                 width = cfg->src_addr_width;
 662         } else if (c->dir == DMA_MEM_TO_DEV) {
 663                 c->ccfg = CX_CFG_SRCINCR;
 664                 c->dev_addr = cfg->dst_addr;
 665                 maxburst = cfg->dst_maxburst;
 666                 width = cfg->dst_addr_width;
 667         }
 668         switch (width) {
 669         case DMA_SLAVE_BUSWIDTH_1_BYTE:
 670         case DMA_SLAVE_BUSWIDTH_2_BYTES:
 671         case DMA_SLAVE_BUSWIDTH_4_BYTES:
 672         case DMA_SLAVE_BUSWIDTH_8_BYTES:
 673                 val =  __ffs(width);
 674                 break;
 675         default:
 676                 val = 3;
 677                 break;
 678         }
 679         c->ccfg |= (val << 12) | (val << 16);
 680
 681         if ((maxburst == 0) || (maxburst > 16))
 682                 val = 15;
 683         else
 684                 val = maxburst - 1;
 685         c->ccfg |= (val << 20) | (val << 24);
 686         c->ccfg |= CX_CFG_MEM2PER | CX_CFG_EN;
 687
 688         /* specific request line */
 689         c->ccfg |= c->vc.chan.chan_id << 4;
 690
 691         return 0;
 692 }
 693
 694 static void k3_dma_free_desc(struct virt_dma_desc *vd)
 695 {
 696         struct k3_dma_desc_sw *ds =
 697                 container_of(vd, struct k3_dma_desc_sw, vd);
 698         struct k3_dma_dev *d = to_k3_dma(vd->tx.chan->device);
 699
 700         dma_pool_free(d->pool, ds->desc_hw, ds->desc_hw_lli);
 701         kfree(ds);
 702 }
 703
 704 static int k3_dma_terminate_all(struct dma_chan *chan)
 705 {
 706         struct k3_dma_chan *c = to_k3_chan(chan);
 707         struct k3_dma_dev *d = to_k3_dma(chan->device);
 708         struct k3_dma_phy *p = c->phy;
 709         unsigned long flags;
 710         LIST_HEAD(head);
 711
 712         dev_dbg(d->slave.dev, "vchan %p: terminate all\n", &c->vc);
 713
 714         /* Prevent this channel being scheduled */
 715         spin_lock(&d->lock);
 716         list_del_init(&c->node);
 717         spin_unlock(&d->lock);
 718
 719         /* Clear the tx descriptor lists */
 720         spin_lock_irqsave(&c->vc.lock, flags);
 721         vchan_get_all_descriptors(&c->vc, &head);
 722         if (p) {
 723                 /* vchan is assigned to a pchan - stop the channel */
 724                 k3_dma_terminate_chan(p, d);
 725                 c->phy = NULL;
 726                 p->vchan = NULL;
 727                 if (p->ds_run) {
 728                         k3_dma_free_desc(&p->ds_run->vd);
 729                         p->ds_run = NULL;
 730                 }
 731                 p->ds_done = NULL;
 732         }
 733         spin_unlock_irqrestore(&c->vc.lock, flags);
 734         vchan_dma_desc_free_list(&c->vc, &head);
 735
 736         return 0;
 737 }
 738
 739 static int k3_dma_transfer_pause(struct dma_chan *chan)
 740 {
 741         struct k3_dma_chan *c = to_k3_chan(chan);
 742         struct k3_dma_dev *d = to_k3_dma(chan->device);
 743         struct k3_dma_phy *p = c->phy;
 744
 745         dev_dbg(d->slave.dev, "vchan %p: pause\n", &c->vc);
 746         if (c->status == DMA_IN_PROGRESS) {
 747                 c->status = DMA_PAUSED;
 748                 if (p) {
 749                         k3_dma_pause_dma(p, false);
 750                 } else {
 751                         spin_lock(&d->lock);
 752                         list_del_init(&c->node);
 753                         spin_unlock(&d->lock);
 754                 }
 755         }
 756
 757         return 0;
 758 }
 759
 760 static int k3_dma_transfer_resume(struct dma_chan *chan)
 761 {
 762         struct k3_dma_chan *c = to_k3_chan(chan);
 763         struct k3_dma_dev *d = to_k3_dma(chan->device);
 764         struct k3_dma_phy *p = c->phy;
 765         unsigned long flags;
 766
 767         dev_dbg(d->slave.dev, "vchan %p: resume\n", &c->vc);
 768         spin_lock_irqsave(&c->vc.lock, flags);
 769         if (c->status == DMA_PAUSED) {
 770                 c->status = DMA_IN_PROGRESS;
 771                 if (p) {
 772                         k3_dma_pause_dma(p, true);
 773                 } else if (!list_empty(&c->vc.desc_issued)) {
 774                         spin_lock(&d->lock);
 775                         list_add_tail(&c->node, &d->chan_pending);
 776                         spin_unlock(&d->lock);
 777                 }
 778         }
 779         spin_unlock_irqrestore(&c->vc.lock, flags);
 780
 781         return 0;
 782 }
 783
 784 static const struct of_device_id k3_pdma_dt_ids[] = {
 785         { .compatible = "hisilicon,k3-dma-1.0", },
 786         {}
 787 };
 788 MODULE_DEVICE_TABLE(of, k3_pdma_dt_ids);
 789
 790 static struct dma_chan *k3_of_dma_simple_xlate(struct of_phandle_args *dma_spec,
 791                                                 struct of_dma *ofdma)
 792 {
 793         struct k3_dma_dev *d = ofdma->of_dma_data;
 794         unsigned int request = dma_spec->args[0];
 795
 796         if (request >= d->dma_requests)
 797                 return NULL;
 798
 799         return dma_get_slave_channel(&(d->chans[request].vc.chan));
 800 }
 801
 802 static int k3_dma_probe(struct platform_device *op)
 803 {
 804         struct k3_dma_dev *d;
 805         const struct of_device_id *of_id;
 806         struct resource *iores;
 807         int i, ret, irq = 0;
 808
 809         iores = platform_get_resource(op, IORESOURCE_MEM, 0);
 810         if (!iores)
 811                 return -EINVAL;
 812
 813         d = devm_kzalloc(&op->dev, sizeof(*d), GFP_KERNEL);
 814         if (!d)
 815                 return -ENOMEM;
 816
 817         d->base = devm_ioremap_resource(&op->dev, iores);
 818         if (IS_ERR(d->base))
 819                 return PTR_ERR(d->base);
 820
 821         of_id = of_match_device(k3_pdma_dt_ids, &op->dev);
 822         if (of_id) {
 823                 of_property_read_u32((&op->dev)->of_node,
 824                                 "dma-channels", &d->dma_channels);
 825                 of_property_read_u32((&op->dev)->of_node,
 826                                 "dma-requests", &d->dma_requests);
 827         }
 828
 829         d->clk = devm_clk_get(&op->dev, NULL);
 830         if (IS_ERR(d->clk)) {
 831                 dev_err(&op->dev, "no dma clk\n");
 832                 return PTR_ERR(d->clk);
 833         }
 834
 835         irq = platform_get_irq(op, 0);
 836         ret = devm_request_irq(&op->dev, irq,
 837                         k3_dma_int_handler, 0, DRIVER_NAME, d);
 838         if (ret)
 839                 return ret;
 840
 841         d->irq = irq;
 842
 843         /* A DMA memory pool for LLIs, align on 32-byte boundary */
 844         d->pool = dmam_pool_create(DRIVER_NAME, &op->dev,
 845                                         LLI_BLOCK_SIZE, 32, 0);
 846         if (!d->pool)
 847                 return -ENOMEM;
 848
 849         /* init phy channel */
 850         d->phy = devm_kzalloc(&op->dev,
 851                 d->dma_channels * sizeof(struct k3_dma_phy), GFP_KERNEL);
 852         if (d->phy == NULL)
 853                 return -ENOMEM;
 854
 855         for (i = 0; i < d->dma_channels; i++) {
 856                 struct k3_dma_phy *p = &d->phy[i];
 857
 858                 p->idx = i;
 859                 p->base = d->base + i * 0x40;
 860         }
 861
 862         INIT_LIST_HEAD(&d->slave.channels);
 863         dma_cap_set(DMA_SLAVE, d->slave.cap_mask);
 864         dma_cap_set(DMA_MEMCPY, d->slave.cap_mask);
 865         dma_cap_set(DMA_CYCLIC, d->slave.cap_mask);
 866         d->slave.dev = &op->dev;
 867         d->slave.device_free_chan_resources = k3_dma_free_chan_resources;
 868         d->slave.device_tx_status = k3_dma_tx_status;
 869         d->slave.device_prep_dma_memcpy = k3_dma_prep_memcpy;
 870         d->slave.device_prep_slave_sg = k3_dma_prep_slave_sg;
 871         d->slave.device_prep_dma_cyclic = k3_dma_prep_dma_cyclic;
 872         d->slave.device_issue_pending = k3_dma_issue_pending;
 873         d->slave.device_config = k3_dma_config;
 874         d->slave.device_pause = k3_dma_transfer_pause;
 875         d->slave.device_resume = k3_dma_transfer_resume;
 876         d->slave.device_terminate_all = k3_dma_terminate_all;
 877         d->slave.copy_align = DMAENGINE_ALIGN_8_BYTES;
 878
 879         /* init virtual channel */
 880         d->chans = devm_kzalloc(&op->dev,
 881                 d->dma_requests * sizeof(struct k3_dma_chan), GFP_KERNEL);
 882         if (d->chans == NULL)
 883                 return -ENOMEM;
 884
 885         for (i = 0; i < d->dma_requests; i++) {
 886                 struct k3_dma_chan *c = &d->chans[i];
 887
 888                 c->status = DMA_IN_PROGRESS;
 889                 INIT_LIST_HEAD(&c->node);
 890                 c->vc.desc_free = k3_dma_free_desc;
 891                 vchan_init(&c->vc, &d->slave);
 892         }
 893
 894         /* Enable clock before accessing registers */
 895         ret = clk_prepare_enable(d->clk);
 896         if (ret < 0) {
 897                 dev_err(&op->dev, "clk_prepare_enable failed: %d\n", ret);
 898                 return ret;
 899         }
 900
 901         k3_dma_enable_dma(d, true);
 902
 903         ret = dma_async_device_register(&d->slave);
 904         if (ret)
 905                 goto dma_async_register_fail;
 906
 907         ret = of_dma_controller_register((&op->dev)->of_node,
 908                                         k3_of_dma_simple_xlate, d);
 909         if (ret)
 910                 goto of_dma_register_fail;
 911
 912         spin_lock_init(&d->lock);
 913         INIT_LIST_HEAD(&d->chan_pending);
 914         tasklet_init(&d->task, k3_dma_tasklet, (unsigned long)d);
 915         platform_set_drvdata(op, d);
 916         dev_info(&op->dev, "initialized\n");
 917
 918         return 0;
 919
 920 of_dma_register_fail:
 921         dma_async_device_unregister(&d->slave);
 922 dma_async_register_fail:
 923         clk_disable_unprepare(d->clk);
 924         return ret;
 925 }
 926
 927 static int k3_dma_remove(struct platform_device *op)
 928 {
 929         struct k3_dma_chan *c, *cn;
 930         struct k3_dma_dev *d = platform_get_drvdata(op);
 931
 932         dma_async_device_unregister(&d->slave);
 933         of_dma_controller_free((&op->dev)->of_node);
 934
 935         devm_free_irq(&op->dev, d->irq, d);
 936
 937         list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) {
 938                 list_del(&c->vc.chan.device_node);
 939                 tasklet_kill(&c->vc.task);
 940         }
 941         tasklet_kill(&d->task);
 942         clk_disable_unprepare(d->clk);
 943         return 0;
 944 }
 945
 946 #ifdef CONFIG_PM_SLEEP
 947 static int k3_dma_suspend_dev(struct device *dev)
 948 {
 949         struct k3_dma_dev *d = dev_get_drvdata(dev);
 950         u32 stat = 0;
 951
 952         stat = k3_dma_get_chan_stat(d);
 953         if (stat) {
 954                 dev_warn(d->slave.dev,
 955                         "chan %d is running fail to suspend\n", stat);
 956                 return -1;
 957         }
 958         k3_dma_enable_dma(d, false);
 959         clk_disable_unprepare(d->clk);
 960         return 0;
 961 }
 962
 963 static int k3_dma_resume_dev(struct device *dev)
 964 {
 965         struct k3_dma_dev *d = dev_get_drvdata(dev);
 966         int ret = 0;
 967
 968         ret = clk_prepare_enable(d->clk);
 969         if (ret < 0) {
 970                 dev_err(d->slave.dev, "clk_prepare_enable failed: %d\n", ret);
 971                 return ret;
 972         }
 973         k3_dma_enable_dma(d, true);
 974         return 0;
 975 }
 976 #endif
 977
 978 static SIMPLE_DEV_PM_OPS(k3_dma_pmops, k3_dma_suspend_dev, k3_dma_resume_dev);
 979
 980 static struct platform_driver k3_pdma_driver = {
 981         .driver         = {
 982                 .name   = DRIVER_NAME,
 983                 .pm     = &k3_dma_pmops,
 984                 .of_match_table = k3_pdma_dt_ids,
 985         },
 986         .probe          = k3_dma_probe,
 987         .remove         = k3_dma_remove,
 988 };
 989
 990 module_platform_driver(k3_pdma_driver);
 991
 992 MODULE_DESCRIPTION("Hisilicon k3 DMA Driver");
 993 MODULE_ALIAS("platform:k3dma");
 994 MODULE_LICENSE("GPL v2");