kernel/drivers/dma/k3dma.c

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