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                                 vchan_cookie_complete(&p->ds_run->vd);
 226                                 p->ds_done = p->ds_run;
 227                                 p->ds_run = NULL;
 228                                 spin_unlock_irqrestore(&c->vc.lock, flags);
 229                         }
 230                         if (c && (tc2 & BIT(i))) {
 231                                 spin_lock_irqsave(&c->vc.lock, flags);
 232                                 if (p->ds_run != NULL)
 233                                         vchan_cyclic_callback(&p->ds_run->vd);
 234                                 spin_unlock_irqrestore(&c->vc.lock, flags);
 235                         }
 236                         irq_chan |= BIT(i);
 237                 }
 238                 if (unlikely((err1 & BIT(i)) || (err2 & BIT(i))))
 239                         dev_warn(d->slave.dev, "DMA ERR\n");
 240         }
 241
 242         writel_relaxed(irq_chan, d->base + INT_TC1_RAW);
 243         writel_relaxed(irq_chan, d->base + INT_TC2_RAW);
 244         writel_relaxed(err1, d->base + INT_ERR1_RAW);
 245         writel_relaxed(err2, d->base + INT_ERR2_RAW);
 246
 247         if (irq_chan)
 248                 tasklet_schedule(&d->task);
 249
 250         if (irq_chan || err1 || err2)
 251                 return IRQ_HANDLED;
 252
 253         return IRQ_NONE;
 254 }
 255
 256 static int k3_dma_start_txd(struct k3_dma_chan *c)
 257 {
 258         struct k3_dma_dev *d = to_k3_dma(c->vc.chan.device);
 259         struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
 260
 261         if (!c->phy)
 262                 return -EAGAIN;
 263
 264         if (BIT(c->phy->idx) & k3_dma_get_chan_stat(d))
 265                 return -EAGAIN;
 266
 267         if (vd) {
 268                 struct k3_dma_desc_sw *ds =
 269                         container_of(vd, struct k3_dma_desc_sw, vd);
 270                 /*
 271                  * fetch and remove request from vc->desc_issued
 272                  * so vc->desc_issued only contains desc pending
 273                  */
 274                 list_del(&ds->vd.node);
 275
 276                 c->phy->ds_run = ds;
 277                 c->phy->ds_done = NULL;
 278                 /* start dma */
 279                 k3_dma_set_desc(c->phy, &ds->desc_hw[0]);
 280                 return 0;
 281         }
 282         c->phy->ds_run = NULL;
 283         c->phy->ds_done = NULL;
 284         return -EAGAIN;
 285 }
 286
 287 static void k3_dma_tasklet(unsigned long arg)
 288 {
 289         struct k3_dma_dev *d = (struct k3_dma_dev *)arg;
 290         struct k3_dma_phy *p;
 291         struct k3_dma_chan *c, *cn;
 292         unsigned pch, pch_alloc = 0;
 293
 294         /* check new dma request of running channel in vc->desc_issued */
 295         list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) {
 296                 spin_lock_irq(&c->vc.lock);
 297                 p = c->phy;
 298                 if (p && p->ds_done) {
 299                         if (k3_dma_start_txd(c)) {
 300                                 /* No current txd associated with this channel */
 301                                 dev_dbg(d->slave.dev, "pchan %u: free\n", p->idx);
 302                                 /* Mark this channel free */
 303                                 c->phy = NULL;
 304                                 p->vchan = NULL;
 305                         }
 306                 }
 307                 spin_unlock_irq(&c->vc.lock);
 308         }
 309
 310         /* check new channel request in d->chan_pending */
 311         spin_lock_irq(&d->lock);
 312         for (pch = 0; pch < d->dma_channels; pch++) {
 313                 p = &d->phy[pch];
 314
 315                 if (p->vchan == NULL && !list_empty(&d->chan_pending)) {
 316                         c = list_first_entry(&d->chan_pending,
 317                                 struct k3_dma_chan, node);
 318                         /* remove from d->chan_pending */
 319                         list_del_init(&c->node);
 320                         pch_alloc |= 1 << pch;
 321                         /* Mark this channel allocated */
 322                         p->vchan = c;
 323                         c->phy = p;
 324                         dev_dbg(d->slave.dev, "pchan %u: alloc vchan %p\n", pch, &c->vc);
 325                 }
 326         }
 327         spin_unlock_irq(&d->lock);
 328
 329         for (pch = 0; pch < d->dma_channels; pch++) {
 330                 if (pch_alloc & (1 << pch)) {
 331                         p = &d->phy[pch];
 332                         c = p->vchan;
 333                         if (c) {
 334                                 spin_lock_irq(&c->vc.lock);
 335                                 k3_dma_start_txd(c);
 336                                 spin_unlock_irq(&c->vc.lock);
 337                         }
 338                 }
 339         }
 340 }
 341
 342 static void k3_dma_free_chan_resources(struct dma_chan *chan)
 343 {
 344         struct k3_dma_chan *c = to_k3_chan(chan);
 345         struct k3_dma_dev *d = to_k3_dma(chan->device);
 346         unsigned long flags;
 347
 348         spin_lock_irqsave(&d->lock, flags);
 349         list_del_init(&c->node);
 350         spin_unlock_irqrestore(&d->lock, flags);
 351
 352         vchan_free_chan_resources(&c->vc);
 353         c->ccfg = 0;
 354 }
 355
 356 static enum dma_status k3_dma_tx_status(struct dma_chan *chan,
 357         dma_cookie_t cookie, struct dma_tx_state *state)
 358 {
 359         struct k3_dma_chan *c = to_k3_chan(chan);
 360         struct k3_dma_dev *d = to_k3_dma(chan->device);
 361         struct k3_dma_phy *p;
 362         struct virt_dma_desc *vd;
 363         unsigned long flags;
 364         enum dma_status ret;
 365         size_t bytes = 0;
 366
 367         ret = dma_cookie_status(&c->vc.chan, cookie, state);
 368         if (ret == DMA_COMPLETE)
 369                 return ret;
 370
 371         spin_lock_irqsave(&c->vc.lock, flags);
 372         p = c->phy;
 373         ret = c->status;
 374
 375         /*
 376          * If the cookie is on our issue queue, then the residue is
 377          * its total size.
 378          */
 379         vd = vchan_find_desc(&c->vc, cookie);
 380         if (vd && !c->cyclic) {
 381                 bytes = container_of(vd, struct k3_dma_desc_sw, vd)->size;
 382         } else if ((!p) || (!p->ds_run)) {
 383                 bytes = 0;
 384         } else {
 385                 struct k3_dma_desc_sw *ds = p->ds_run;
 386                 u32 clli = 0, index = 0;
 387
 388                 bytes = k3_dma_get_curr_cnt(d, p);
 389                 clli = k3_dma_get_curr_lli(p);
 390                 index = ((clli - ds->desc_hw_lli) /
 391                                 sizeof(struct k3_desc_hw)) + 1;
 392                 for (; index < ds->desc_num; index++) {
 393                         bytes += ds->desc_hw[index].count;
 394                         /* end of lli */
 395                         if (!ds->desc_hw[index].lli)
 396                                 break;
 397                 }
 398         }
 399         spin_unlock_irqrestore(&c->vc.lock, flags);
 400         dma_set_residue(state, bytes);
 401         return ret;
 402 }
 403
 404 static void k3_dma_issue_pending(struct dma_chan *chan)
 405 {
 406         struct k3_dma_chan *c = to_k3_chan(chan);
 407         struct k3_dma_dev *d = to_k3_dma(chan->device);
 408         unsigned long flags;
 409
 410         spin_lock_irqsave(&c->vc.lock, flags);
 411         /* add request to vc->desc_issued */
 412         if (vchan_issue_pending(&c->vc)) {
 413                 spin_lock(&d->lock);
 414                 if (!c->phy) {
 415                         if (list_empty(&c->node)) {
 416                                 /* if new channel, add chan_pending */
 417                                 list_add_tail(&c->node, &d->chan_pending);
 418                                 /* check in tasklet */
 419                                 tasklet_schedule(&d->task);
 420                                 dev_dbg(d->slave.dev, "vchan %p: issued\n", &c->vc);
 421                         }
 422                 }
 423                 spin_unlock(&d->lock);
 424         } else
 425                 dev_dbg(d->slave.dev, "vchan %p: nothing to issue\n", &c->vc);
 426         spin_unlock_irqrestore(&c->vc.lock, flags);
 427 }
 428
 429 static void k3_dma_fill_desc(struct k3_dma_desc_sw *ds, dma_addr_t dst,
 430                         dma_addr_t src, size_t len, u32 num, u32 ccfg)
 431 {
 432         if (num != ds->desc_num - 1)
 433                 ds->desc_hw[num].lli = ds->desc_hw_lli + (num + 1) *
 434                         sizeof(struct k3_desc_hw);
 435
 436         ds->desc_hw[num].lli |= CX_LLI_CHAIN_EN;
 437         ds->desc_hw[num].count = len;
 438         ds->desc_hw[num].saddr = src;
 439         ds->desc_hw[num].daddr = dst;
 440         ds->desc_hw[num].config = ccfg;
 441 }
 442
 443 static struct k3_dma_desc_sw *k3_dma_alloc_desc_resource(int num,
 444                                                         struct dma_chan *chan)
 445 {
 446         struct k3_dma_chan *c = to_k3_chan(chan);
 447         struct k3_dma_desc_sw *ds;
 448         struct k3_dma_dev *d = to_k3_dma(chan->device);
 449         int lli_limit = LLI_BLOCK_SIZE / sizeof(struct k3_desc_hw);
 450
 451         if (num > lli_limit) {
 452                 dev_dbg(chan->device->dev, "vch %p: sg num %d exceed max %d\n",
 453                         &c->vc, num, lli_limit);
 454                 return NULL;
 455         }
 456
 457         ds = kzalloc(sizeof(*ds), GFP_NOWAIT);
 458         if (!ds)
 459                 return NULL;
 460
 461         ds->desc_hw = dma_pool_zalloc(d->pool, GFP_NOWAIT, &ds->desc_hw_lli);
 462         if (!ds->desc_hw) {
 463                 dev_dbg(chan->device->dev, "vch %p: dma alloc fail\n", &c->vc);
 464                 kfree(ds);
 465                 return NULL;
 466         }
 467         ds->desc_num = num;
 468         return ds;
 469 }
 470
 471 static struct dma_async_tx_descriptor *k3_dma_prep_memcpy(
 472         struct dma_chan *chan,  dma_addr_t dst, dma_addr_t src,
 473         size_t len, unsigned long flags)
 474 {
 475         struct k3_dma_chan *c = to_k3_chan(chan);
 476         struct k3_dma_desc_sw *ds;
 477         size_t copy = 0;
 478         int num = 0;
 479
 480         if (!len)
 481                 return NULL;
 482
 483         num = DIV_ROUND_UP(len, DMA_MAX_SIZE);
 484
 485         ds = k3_dma_alloc_desc_resource(num, chan);
 486         if (!ds)
 487                 return NULL;
 488
 489         c->cyclic = 0;
 490         ds->size = len;
 491         num = 0;
 492
 493         if (!c->ccfg) {
 494                 /* default is memtomem, without calling device_config */
 495                 c->ccfg = CX_CFG_SRCINCR | CX_CFG_DSTINCR | CX_CFG_EN;
 496                 c->ccfg |= (0xf << 20) | (0xf << 24);   /* burst = 16 */
 497                 c->ccfg |= (0x3 << 12) | (0x3 << 16);   /* width = 64 bit */
 498         }
 499
 500         do {
 501                 copy = min_t(size_t, len, DMA_MAX_SIZE);
 502                 k3_dma_fill_desc(ds, dst, src, copy, num++, c->ccfg);
 503
 504                 if (c->dir == DMA_MEM_TO_DEV) {
 505                         src += copy;
 506                 } else if (c->dir == DMA_DEV_TO_MEM) {
 507                         dst += copy;
 508                 } else {
 509                         src += copy;
 510                         dst += copy;
 511                 }
 512                 len -= copy;
 513         } while (len);
 514
 515         ds->desc_hw[num-1].lli = 0;     /* end of link */
 516         return vchan_tx_prep(&c->vc, &ds->vd, flags);
 517 }
 518
 519 static struct dma_async_tx_descriptor *k3_dma_prep_slave_sg(
 520         struct dma_chan *chan, struct scatterlist *sgl, unsigned int sglen,
 521         enum dma_transfer_direction dir, unsigned long flags, void *context)
 522 {
 523         struct k3_dma_chan *c = to_k3_chan(chan);
 524         struct k3_dma_desc_sw *ds;
 525         size_t len, avail, total = 0;
 526         struct scatterlist *sg;
 527         dma_addr_t addr, src = 0, dst = 0;
 528         int num = sglen, i;
 529
 530         if (sgl == NULL)
 531                 return NULL;
 532
 533         c->cyclic = 0;
 534
 535         for_each_sg(sgl, sg, sglen, i) {
 536                 avail = sg_dma_len(sg);
 537                 if (avail > DMA_MAX_SIZE)
 538                         num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1;
 539         }
 540
 541         ds = k3_dma_alloc_desc_resource(num, chan);
 542         if (!ds)
 543                 return NULL;
 544         num = 0;
 545
 546         for_each_sg(sgl, sg, sglen, i) {
 547                 addr = sg_dma_address(sg);
 548                 avail = sg_dma_len(sg);
 549                 total += avail;
 550
 551                 do {
 552                         len = min_t(size_t, avail, DMA_MAX_SIZE);
 553
 554                         if (dir == DMA_MEM_TO_DEV) {
 555                                 src = addr;
 556                                 dst = c->dev_addr;
 557                         } else if (dir == DMA_DEV_TO_MEM) {
 558                                 src = c->dev_addr;
 559                                 dst = addr;
 560                         }
 561
 562                         k3_dma_fill_desc(ds, dst, src, len, num++, c->ccfg);
 563
 564                         addr += len;
 565                         avail -= len;
 566                 } while (avail);
 567         }
 568
 569         ds->desc_hw[num-1].lli = 0;     /* end of link */
 570         ds->size = total;
 571         return vchan_tx_prep(&c->vc, &ds->vd, flags);
 572 }
 573
 574 static struct dma_async_tx_descriptor *
 575 k3_dma_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr,
 576                        size_t buf_len, size_t period_len,
 577                        enum dma_transfer_direction dir,
 578                        unsigned long flags)
 579 {
 580         struct k3_dma_chan *c = to_k3_chan(chan);
 581         struct k3_dma_desc_sw *ds;
 582         size_t len, avail, total = 0;
 583         dma_addr_t addr, src = 0, dst = 0;
 584         int num = 1, since = 0;
 585         size_t modulo = DMA_CYCLIC_MAX_PERIOD;
 586         u32 en_tc2 = 0;
 587
 588         dev_dbg(chan->device->dev, "%s: buf %pad, dst %pad, buf len %zu, period_len = %zu, dir %d\n",
 589                __func__, &buf_addr, &to_k3_chan(chan)->dev_addr,
 590                buf_len, period_len, (int)dir);
 591
 592         avail = buf_len;
 593         if (avail > modulo)
 594                 num += DIV_ROUND_UP(avail, modulo) - 1;
 595
 596         ds = k3_dma_alloc_desc_resource(num, chan);
 597         if (!ds)
 598                 return NULL;
 599
 600         c->cyclic = 1;
 601         addr = buf_addr;
 602         avail = buf_len;
 603         total = avail;
 604         num = 0;
 605
 606         if (period_len < modulo)
 607                 modulo = period_len;
 608
 609         do {
 610                 len = min_t(size_t, avail, modulo);
 611
 612                 if (dir == DMA_MEM_TO_DEV) {
 613                         src = addr;
 614                         dst = c->dev_addr;
 615                 } else if (dir == DMA_DEV_TO_MEM) {
 616                         src = c->dev_addr;
 617                         dst = addr;
 618                 }
 619                 since += len;
 620                 if (since >= period_len) {
 621                         /* descriptor asks for TC2 interrupt on completion */
 622                         en_tc2 = CX_CFG_NODEIRQ;
 623                         since -= period_len;
 624                 } else
 625                         en_tc2 = 0;
 626
 627                 k3_dma_fill_desc(ds, dst, src, len, num++, c->ccfg | en_tc2);
 628
 629                 addr += len;
 630                 avail -= len;
 631         } while (avail);
 632
 633         /* "Cyclic" == end of link points back to start of link */
 634         ds->desc_hw[num - 1].lli |= ds->desc_hw_lli;
 635
 636         ds->size = total;
 637
 638         return vchan_tx_prep(&c->vc, &ds->vd, flags);
 639 }
 640
 641 static int k3_dma_config(struct dma_chan *chan,
 642                          struct dma_slave_config *cfg)
 643 {
 644         struct k3_dma_chan *c = to_k3_chan(chan);
 645         u32 maxburst = 0, val = 0;
 646         enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
 647
 648         if (cfg == NULL)
 649                 return -EINVAL;
 650         c->dir = cfg->direction;
 651         if (c->dir == DMA_DEV_TO_MEM) {
 652                 c->ccfg = CX_CFG_DSTINCR;
 653                 c->dev_addr = cfg->src_addr;
 654                 maxburst = cfg->src_maxburst;
 655                 width = cfg->src_addr_width;
 656         } else if (c->dir == DMA_MEM_TO_DEV) {
 657                 c->ccfg = CX_CFG_SRCINCR;
 658                 c->dev_addr = cfg->dst_addr;
 659                 maxburst = cfg->dst_maxburst;
 660                 width = cfg->dst_addr_width;
 661         }
 662         switch (width) {
 663         case DMA_SLAVE_BUSWIDTH_1_BYTE:
 664         case DMA_SLAVE_BUSWIDTH_2_BYTES:
 665         case DMA_SLAVE_BUSWIDTH_4_BYTES:
 666         case DMA_SLAVE_BUSWIDTH_8_BYTES:
 667                 val =  __ffs(width);
 668                 break;
 669         default:
 670                 val = 3;
 671                 break;
 672         }
 673         c->ccfg |= (val << 12) | (val << 16);
 674
 675         if ((maxburst == 0) || (maxburst > 16))
 676                 val = 15;
 677         else
 678                 val = maxburst - 1;
 679         c->ccfg |= (val << 20) | (val << 24);
 680         c->ccfg |= CX_CFG_MEM2PER | CX_CFG_EN;
 681
 682         /* specific request line */
 683         c->ccfg |= c->vc.chan.chan_id << 4;
 684
 685         return 0;
 686 }
 687
 688 static void k3_dma_free_desc(struct virt_dma_desc *vd)
 689 {
 690         struct k3_dma_desc_sw *ds =
 691                 container_of(vd, struct k3_dma_desc_sw, vd);
 692         struct k3_dma_dev *d = to_k3_dma(vd->tx.chan->device);
 693
 694         dma_pool_free(d->pool, ds->desc_hw, ds->desc_hw_lli);
 695         kfree(ds);
 696 }
 697
 698 static int k3_dma_terminate_all(struct dma_chan *chan)
 699 {
 700         struct k3_dma_chan *c = to_k3_chan(chan);
 701         struct k3_dma_dev *d = to_k3_dma(chan->device);
 702         struct k3_dma_phy *p = c->phy;
 703         unsigned long flags;
 704         LIST_HEAD(head);
 705
 706         dev_dbg(d->slave.dev, "vchan %p: terminate all\n", &c->vc);
 707
 708         /* Prevent this channel being scheduled */
 709         spin_lock(&d->lock);
 710         list_del_init(&c->node);
 711         spin_unlock(&d->lock);
 712
 713         /* Clear the tx descriptor lists */
 714         spin_lock_irqsave(&c->vc.lock, flags);
 715         vchan_get_all_descriptors(&c->vc, &head);
 716         if (p) {
 717                 /* vchan is assigned to a pchan - stop the channel */
 718                 k3_dma_terminate_chan(p, d);
 719                 c->phy = NULL;
 720                 p->vchan = NULL;
 721                 if (p->ds_run) {
 722                         vchan_terminate_vdesc(&p->ds_run->vd);
 723                         p->ds_run = NULL;
 724                 }
 725                 p->ds_done = NULL;
 726         }
 727         spin_unlock_irqrestore(&c->vc.lock, flags);
 728         vchan_dma_desc_free_list(&c->vc, &head);
 729
 730         return 0;
 731 }
 732
 733 static void k3_dma_synchronize(struct dma_chan *chan)
 734 {
 735         struct k3_dma_chan *c = to_k3_chan(chan);
 736
 737         vchan_synchronize(&c->vc);
 738 }
 739
 740 static int k3_dma_transfer_pause(struct dma_chan *chan)
 741 {
 742         struct k3_dma_chan *c = to_k3_chan(chan);
 743         struct k3_dma_dev *d = to_k3_dma(chan->device);
 744         struct k3_dma_phy *p = c->phy;
 745
 746         dev_dbg(d->slave.dev, "vchan %p: pause\n", &c->vc);
 747         if (c->status == DMA_IN_PROGRESS) {
 748                 c->status = DMA_PAUSED;
 749                 if (p) {
 750                         k3_dma_pause_dma(p, false);
 751                 } else {
 752                         spin_lock(&d->lock);
 753                         list_del_init(&c->node);
 754                         spin_unlock(&d->lock);
 755                 }
 756         }
 757
 758         return 0;
 759 }
 760
 761 static int k3_dma_transfer_resume(struct dma_chan *chan)
 762 {
 763         struct k3_dma_chan *c = to_k3_chan(chan);
 764         struct k3_dma_dev *d = to_k3_dma(chan->device);
 765         struct k3_dma_phy *p = c->phy;
 766         unsigned long flags;
 767
 768         dev_dbg(d->slave.dev, "vchan %p: resume\n", &c->vc);
 769         spin_lock_irqsave(&c->vc.lock, flags);
 770         if (c->status == DMA_PAUSED) {
 771                 c->status = DMA_IN_PROGRESS;
 772                 if (p) {
 773                         k3_dma_pause_dma(p, true);
 774                 } else if (!list_empty(&c->vc.desc_issued)) {
 775                         spin_lock(&d->lock);
 776                         list_add_tail(&c->node, &d->chan_pending);
 777                         spin_unlock(&d->lock);
 778                 }
 779         }
 780         spin_unlock_irqrestore(&c->vc.lock, flags);
 781
 782         return 0;
 783 }
 784
 785 static const struct of_device_id k3_pdma_dt_ids[] = {
 786         { .compatible = "hisilicon,k3-dma-1.0", },
 787         {}
 788 };
 789 MODULE_DEVICE_TABLE(of, k3_pdma_dt_ids);
 790
 791 static struct dma_chan *k3_of_dma_simple_xlate(struct of_phandle_args *dma_spec,
 792                                                 struct of_dma *ofdma)
 793 {
 794         struct k3_dma_dev *d = ofdma->of_dma_data;
 795         unsigned int request = dma_spec->args[0];
 796
 797         if (request >= d->dma_requests)
 798                 return NULL;
 799
 800         return dma_get_slave_channel(&(d->chans[request].vc.chan));
 801 }
 802
 803 static int k3_dma_probe(struct platform_device *op)
 804 {
 805         struct k3_dma_dev *d;
 806         const struct of_device_id *of_id;
 807         struct resource *iores;
 808         int i, ret, irq = 0;
 809
 810         iores = platform_get_resource(op, IORESOURCE_MEM, 0);
 811         if (!iores)
 812                 return -EINVAL;
 813
 814         d = devm_kzalloc(&op->dev, sizeof(*d), GFP_KERNEL);
 815         if (!d)
 816                 return -ENOMEM;
 817
 818         d->base = devm_ioremap_resource(&op->dev, iores);
 819         if (IS_ERR(d->base))
 820                 return PTR_ERR(d->base);
 821
 822         of_id = of_match_device(k3_pdma_dt_ids, &op->dev);
 823         if (of_id) {
 824                 of_property_read_u32((&op->dev)->of_node,
 825                                 "dma-channels", &d->dma_channels);
 826                 of_property_read_u32((&op->dev)->of_node,
 827                                 "dma-requests", &d->dma_requests);
 828         }
 829
 830         d->clk = devm_clk_get(&op->dev, NULL);
 831         if (IS_ERR(d->clk)) {
 832                 dev_err(&op->dev, "no dma clk\n");
 833                 return PTR_ERR(d->clk);
 834         }
 835
 836         irq = platform_get_irq(op, 0);
 837         ret = devm_request_irq(&op->dev, irq,
 838                         k3_dma_int_handler, 0, DRIVER_NAME, d);
 839         if (ret)
 840                 return ret;
 841
 842         d->irq = irq;
 843
 844         /* A DMA memory pool for LLIs, align on 32-byte boundary */
 845         d->pool = dmam_pool_create(DRIVER_NAME, &op->dev,
 846                                         LLI_BLOCK_SIZE, 32, 0);
 847         if (!d->pool)
 848                 return -ENOMEM;
 849
 850         /* init phy channel */
 851         d->phy = devm_kcalloc(&op->dev,
 852                 d->dma_channels, sizeof(struct k3_dma_phy), GFP_KERNEL);
 853         if (d->phy == NULL)
 854                 return -ENOMEM;
 855
 856         for (i = 0; i < d->dma_channels; i++) {
 857                 struct k3_dma_phy *p = &d->phy[i];
 858
 859                 p->idx = i;
 860                 p->base = d->base + i * 0x40;
 861         }
 862
 863         INIT_LIST_HEAD(&d->slave.channels);
 864         dma_cap_set(DMA_SLAVE, d->slave.cap_mask);
 865         dma_cap_set(DMA_MEMCPY, d->slave.cap_mask);
 866         dma_cap_set(DMA_CYCLIC, d->slave.cap_mask);
 867         d->slave.dev = &op->dev;
 868         d->slave.device_free_chan_resources = k3_dma_free_chan_resources;
 869         d->slave.device_tx_status = k3_dma_tx_status;
 870         d->slave.device_prep_dma_memcpy = k3_dma_prep_memcpy;
 871         d->slave.device_prep_slave_sg = k3_dma_prep_slave_sg;
 872         d->slave.device_prep_dma_cyclic = k3_dma_prep_dma_cyclic;
 873         d->slave.device_issue_pending = k3_dma_issue_pending;
 874         d->slave.device_config = k3_dma_config;
 875         d->slave.device_pause = k3_dma_transfer_pause;
 876         d->slave.device_resume = k3_dma_transfer_resume;
 877         d->slave.device_terminate_all = k3_dma_terminate_all;
 878         d->slave.device_synchronize = k3_dma_synchronize;
 879         d->slave.copy_align = DMAENGINE_ALIGN_8_BYTES;
 880
 881         /* init virtual channel */
 882         d->chans = devm_kcalloc(&op->dev,
 883                 d->dma_requests, sizeof(struct k3_dma_chan), GFP_KERNEL);
 884         if (d->chans == NULL)
 885                 return -ENOMEM;
 886
 887         for (i = 0; i < d->dma_requests; i++) {
 888                 struct k3_dma_chan *c = &d->chans[i];
 889
 890                 c->status = DMA_IN_PROGRESS;
 891                 INIT_LIST_HEAD(&c->node);
 892                 c->vc.desc_free = k3_dma_free_desc;
 893                 vchan_init(&c->vc, &d->slave);
 894         }
 895
 896         /* Enable clock before accessing registers */
 897         ret = clk_prepare_enable(d->clk);
 898         if (ret < 0) {
 899                 dev_err(&op->dev, "clk_prepare_enable failed: %d\n", ret);
 900                 return ret;
 901         }
 902
 903         k3_dma_enable_dma(d, true);
 904
 905         ret = dma_async_device_register(&d->slave);
 906         if (ret)
 907                 goto dma_async_register_fail;
 908
 909         ret = of_dma_controller_register((&op->dev)->of_node,
 910                                         k3_of_dma_simple_xlate, d);
 911         if (ret)
 912                 goto of_dma_register_fail;
 913
 914         spin_lock_init(&d->lock);
 915         INIT_LIST_HEAD(&d->chan_pending);
 916         tasklet_init(&d->task, k3_dma_tasklet, (unsigned long)d);
 917         platform_set_drvdata(op, d);
 918         dev_info(&op->dev, "initialized\n");
 919
 920         return 0;
 921
 922 of_dma_register_fail:
 923         dma_async_device_unregister(&d->slave);
 924 dma_async_register_fail:
 925         clk_disable_unprepare(d->clk);
 926         return ret;
 927 }
 928
 929 static int k3_dma_remove(struct platform_device *op)
 930 {
 931         struct k3_dma_chan *c, *cn;
 932         struct k3_dma_dev *d = platform_get_drvdata(op);
 933
 934         dma_async_device_unregister(&d->slave);
 935         of_dma_controller_free((&op->dev)->of_node);
 936
 937         devm_free_irq(&op->dev, d->irq, d);
 938
 939         list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) {
 940                 list_del(&c->vc.chan.device_node);
 941                 tasklet_kill(&c->vc.task);
 942         }
 943         tasklet_kill(&d->task);
 944         clk_disable_unprepare(d->clk);
 945         return 0;
 946 }
 947
 948 #ifdef CONFIG_PM_SLEEP
 949 static int k3_dma_suspend_dev(struct device *dev)
 950 {
 951         struct k3_dma_dev *d = dev_get_drvdata(dev);
 952         u32 stat = 0;
 953
 954         stat = k3_dma_get_chan_stat(d);
 955         if (stat) {
 956                 dev_warn(d->slave.dev,
 957                         "chan %d is running fail to suspend\n", stat);
 958                 return -1;
 959         }
 960         k3_dma_enable_dma(d, false);
 961         clk_disable_unprepare(d->clk);
 962         return 0;
 963 }
 964
 965 static int k3_dma_resume_dev(struct device *dev)
 966 {
 967         struct k3_dma_dev *d = dev_get_drvdata(dev);
 968         int ret = 0;
 969
 970         ret = clk_prepare_enable(d->clk);
 971         if (ret < 0) {
 972                 dev_err(d->slave.dev, "clk_prepare_enable failed: %d\n", ret);
 973                 return ret;
 974         }
 975         k3_dma_enable_dma(d, true);
 976         return 0;
 977 }
 978 #endif
 979
 980 static SIMPLE_DEV_PM_OPS(k3_dma_pmops, k3_dma_suspend_dev, k3_dma_resume_dev);
 981
 982 static struct platform_driver k3_pdma_driver = {
 983         .driver         = {
 984                 .name   = DRIVER_NAME,
 985                 .pm     = &k3_dma_pmops,
 986                 .of_match_table = k3_pdma_dt_ids,
 987         },
 988         .probe          = k3_dma_probe,
 989         .remove         = k3_dma_remove,
 990 };
 991
 992 module_platform_driver(k3_pdma_driver);
 993
 994 MODULE_DESCRIPTION("Hisilicon k3 DMA Driver");
 995 MODULE_ALIAS("platform:k3dma");
 996 MODULE_LICENSE("GPL v2");