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 int k3_dma_alloc_chan_resources(struct dma_chan *chan) 317 { 318 return 0; 319 } 320 321 static void k3_dma_free_chan_resources(struct dma_chan *chan) 322 { 323 struct k3_dma_chan *c = to_k3_chan(chan); 324 struct k3_dma_dev *d = to_k3_dma(chan->device); 325 unsigned long flags; 326 327 spin_lock_irqsave(&d->lock, flags); 328 list_del_init(&c->node); 329 spin_unlock_irqrestore(&d->lock, flags); 330 331 vchan_free_chan_resources(&c->vc); 332 c->ccfg = 0; 333 } 334 335 static enum dma_status k3_dma_tx_status(struct dma_chan *chan, 336 dma_cookie_t cookie, struct dma_tx_state *state) 337 { 338 struct k3_dma_chan *c = to_k3_chan(chan); 339 struct k3_dma_dev *d = to_k3_dma(chan->device); 340 struct k3_dma_phy *p; 341 struct virt_dma_desc *vd; 342 unsigned long flags; 343 enum dma_status ret; 344 size_t bytes = 0; 345 346 ret = dma_cookie_status(&c->vc.chan, cookie, state); 347 if (ret == DMA_COMPLETE) 348 return ret; 349 350 spin_lock_irqsave(&c->vc.lock, flags); 351 p = c->phy; 352 ret = c->status; 353 354 /* 355 * If the cookie is on our issue queue, then the residue is 356 * its total size. 357 */ 358 vd = vchan_find_desc(&c->vc, cookie); 359 if (vd) { 360 bytes = container_of(vd, struct k3_dma_desc_sw, vd)->size; 361 } else if ((!p) || (!p->ds_run)) { 362 bytes = 0; 363 } else { 364 struct k3_dma_desc_sw *ds = p->ds_run; 365 u32 clli = 0, index = 0; 366 367 bytes = k3_dma_get_curr_cnt(d, p); 368 clli = k3_dma_get_curr_lli(p); 369 index = (clli - ds->desc_hw_lli) / sizeof(struct k3_desc_hw); 370 for (; index < ds->desc_num; index++) { 371 bytes += ds->desc_hw[index].count; 372 /* end of lli */ 373 if (!ds->desc_hw[index].lli) 374 break; 375 } 376 } 377 spin_unlock_irqrestore(&c->vc.lock, flags); 378 dma_set_residue(state, bytes); 379 return ret; 380 } 381 382 static void k3_dma_issue_pending(struct dma_chan *chan) 383 { 384 struct k3_dma_chan *c = to_k3_chan(chan); 385 struct k3_dma_dev *d = to_k3_dma(chan->device); 386 unsigned long flags; 387 388 spin_lock_irqsave(&c->vc.lock, flags); 389 /* add request to vc->desc_issued */ 390 if (vchan_issue_pending(&c->vc)) { 391 spin_lock(&d->lock); 392 if (!c->phy) { 393 if (list_empty(&c->node)) { 394 /* if new channel, add chan_pending */ 395 list_add_tail(&c->node, &d->chan_pending); 396 /* check in tasklet */ 397 tasklet_schedule(&d->task); 398 dev_dbg(d->slave.dev, "vchan %p: issued\n", &c->vc); 399 } 400 } 401 spin_unlock(&d->lock); 402 } else 403 dev_dbg(d->slave.dev, "vchan %p: nothing to issue\n", &c->vc); 404 spin_unlock_irqrestore(&c->vc.lock, flags); 405 } 406 407 static void k3_dma_fill_desc(struct k3_dma_desc_sw *ds, dma_addr_t dst, 408 dma_addr_t src, size_t len, u32 num, u32 ccfg) 409 { 410 if ((num + 1) < ds->desc_num) 411 ds->desc_hw[num].lli = ds->desc_hw_lli + (num + 1) * 412 sizeof(struct k3_desc_hw); 413 ds->desc_hw[num].lli |= CX_LLI_CHAIN_EN; 414 ds->desc_hw[num].count = len; 415 ds->desc_hw[num].saddr = src; 416 ds->desc_hw[num].daddr = dst; 417 ds->desc_hw[num].config = ccfg; 418 } 419 420 static struct dma_async_tx_descriptor *k3_dma_prep_memcpy( 421 struct dma_chan *chan, dma_addr_t dst, dma_addr_t src, 422 size_t len, unsigned long flags) 423 { 424 struct k3_dma_chan *c = to_k3_chan(chan); 425 struct k3_dma_desc_sw *ds; 426 size_t copy = 0; 427 int num = 0; 428 429 if (!len) 430 return NULL; 431 432 num = DIV_ROUND_UP(len, DMA_MAX_SIZE); 433 ds = kzalloc(sizeof(*ds) + num * sizeof(ds->desc_hw[0]), GFP_ATOMIC); 434 if (!ds) { 435 dev_dbg(chan->device->dev, "vchan %p: kzalloc fail\n", &c->vc); 436 return NULL; 437 } 438 ds->desc_hw_lli = __virt_to_phys((unsigned long)&ds->desc_hw[0]); 439 ds->size = len; 440 ds->desc_num = num; 441 num = 0; 442 443 if (!c->ccfg) { 444 /* default is memtomem, without calling device_config */ 445 c->ccfg = CX_CFG_SRCINCR | CX_CFG_DSTINCR | CX_CFG_EN; 446 c->ccfg |= (0xf << 20) | (0xf << 24); /* burst = 16 */ 447 c->ccfg |= (0x3 << 12) | (0x3 << 16); /* width = 64 bit */ 448 } 449 450 do { 451 copy = min_t(size_t, len, DMA_MAX_SIZE); 452 k3_dma_fill_desc(ds, dst, src, copy, num++, c->ccfg); 453 454 if (c->dir == DMA_MEM_TO_DEV) { 455 src += copy; 456 } else if (c->dir == DMA_DEV_TO_MEM) { 457 dst += copy; 458 } else { 459 src += copy; 460 dst += copy; 461 } 462 len -= copy; 463 } while (len); 464 465 ds->desc_hw[num-1].lli = 0; /* end of link */ 466 return vchan_tx_prep(&c->vc, &ds->vd, flags); 467 } 468 469 static struct dma_async_tx_descriptor *k3_dma_prep_slave_sg( 470 struct dma_chan *chan, struct scatterlist *sgl, unsigned int sglen, 471 enum dma_transfer_direction dir, unsigned long flags, void *context) 472 { 473 struct k3_dma_chan *c = to_k3_chan(chan); 474 struct k3_dma_desc_sw *ds; 475 size_t len, avail, total = 0; 476 struct scatterlist *sg; 477 dma_addr_t addr, src = 0, dst = 0; 478 int num = sglen, i; 479 480 if (sgl == NULL) 481 return NULL; 482 483 for_each_sg(sgl, sg, sglen, i) { 484 avail = sg_dma_len(sg); 485 if (avail > DMA_MAX_SIZE) 486 num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1; 487 } 488 489 ds = kzalloc(sizeof(*ds) + num * sizeof(ds->desc_hw[0]), GFP_ATOMIC); 490 if (!ds) { 491 dev_dbg(chan->device->dev, "vchan %p: kzalloc fail\n", &c->vc); 492 return NULL; 493 } 494 ds->desc_hw_lli = __virt_to_phys((unsigned long)&ds->desc_hw[0]); 495 ds->desc_num = num; 496 num = 0; 497 498 for_each_sg(sgl, sg, sglen, i) { 499 addr = sg_dma_address(sg); 500 avail = sg_dma_len(sg); 501 total += avail; 502 503 do { 504 len = min_t(size_t, avail, DMA_MAX_SIZE); 505 506 if (dir == DMA_MEM_TO_DEV) { 507 src = addr; 508 dst = c->dev_addr; 509 } else if (dir == DMA_DEV_TO_MEM) { 510 src = c->dev_addr; 511 dst = addr; 512 } 513 514 k3_dma_fill_desc(ds, dst, src, len, num++, c->ccfg); 515 516 addr += len; 517 avail -= len; 518 } while (avail); 519 } 520 521 ds->desc_hw[num-1].lli = 0; /* end of link */ 522 ds->size = total; 523 return vchan_tx_prep(&c->vc, &ds->vd, flags); 524 } 525 526 static int k3_dma_config(struct dma_chan *chan, 527 struct dma_slave_config *cfg) 528 { 529 struct k3_dma_chan *c = to_k3_chan(chan); 530 u32 maxburst = 0, val = 0; 531 enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED; 532 533 if (cfg == NULL) 534 return -EINVAL; 535 c->dir = cfg->direction; 536 if (c->dir == DMA_DEV_TO_MEM) { 537 c->ccfg = CX_CFG_DSTINCR; 538 c->dev_addr = cfg->src_addr; 539 maxburst = cfg->src_maxburst; 540 width = cfg->src_addr_width; 541 } else if (c->dir == DMA_MEM_TO_DEV) { 542 c->ccfg = CX_CFG_SRCINCR; 543 c->dev_addr = cfg->dst_addr; 544 maxburst = cfg->dst_maxburst; 545 width = cfg->dst_addr_width; 546 } 547 switch (width) { 548 case DMA_SLAVE_BUSWIDTH_1_BYTE: 549 case DMA_SLAVE_BUSWIDTH_2_BYTES: 550 case DMA_SLAVE_BUSWIDTH_4_BYTES: 551 case DMA_SLAVE_BUSWIDTH_8_BYTES: 552 val = __ffs(width); 553 break; 554 default: 555 val = 3; 556 break; 557 } 558 c->ccfg |= (val << 12) | (val << 16); 559 560 if ((maxburst == 0) || (maxburst > 16)) 561 val = 16; 562 else 563 val = maxburst - 1; 564 c->ccfg |= (val << 20) | (val << 24); 565 c->ccfg |= CX_CFG_MEM2PER | CX_CFG_EN; 566 567 /* specific request line */ 568 c->ccfg |= c->vc.chan.chan_id << 4; 569 570 return 0; 571 } 572 573 static int k3_dma_terminate_all(struct dma_chan *chan) 574 { 575 struct k3_dma_chan *c = to_k3_chan(chan); 576 struct k3_dma_dev *d = to_k3_dma(chan->device); 577 struct k3_dma_phy *p = c->phy; 578 unsigned long flags; 579 LIST_HEAD(head); 580 581 dev_dbg(d->slave.dev, "vchan %p: terminate all\n", &c->vc); 582 583 /* Prevent this channel being scheduled */ 584 spin_lock(&d->lock); 585 list_del_init(&c->node); 586 spin_unlock(&d->lock); 587 588 /* Clear the tx descriptor lists */ 589 spin_lock_irqsave(&c->vc.lock, flags); 590 vchan_get_all_descriptors(&c->vc, &head); 591 if (p) { 592 /* vchan is assigned to a pchan - stop the channel */ 593 k3_dma_terminate_chan(p, d); 594 c->phy = NULL; 595 p->vchan = NULL; 596 p->ds_run = p->ds_done = NULL; 597 } 598 spin_unlock_irqrestore(&c->vc.lock, flags); 599 vchan_dma_desc_free_list(&c->vc, &head); 600 601 return 0; 602 } 603 604 static int k3_dma_transfer_pause(struct dma_chan *chan) 605 { 606 struct k3_dma_chan *c = to_k3_chan(chan); 607 struct k3_dma_dev *d = to_k3_dma(chan->device); 608 struct k3_dma_phy *p = c->phy; 609 610 dev_dbg(d->slave.dev, "vchan %p: pause\n", &c->vc); 611 if (c->status == DMA_IN_PROGRESS) { 612 c->status = DMA_PAUSED; 613 if (p) { 614 k3_dma_pause_dma(p, false); 615 } else { 616 spin_lock(&d->lock); 617 list_del_init(&c->node); 618 spin_unlock(&d->lock); 619 } 620 } 621 622 return 0; 623 } 624 625 static int k3_dma_transfer_resume(struct dma_chan *chan) 626 { 627 struct k3_dma_chan *c = to_k3_chan(chan); 628 struct k3_dma_dev *d = to_k3_dma(chan->device); 629 struct k3_dma_phy *p = c->phy; 630 unsigned long flags; 631 632 dev_dbg(d->slave.dev, "vchan %p: resume\n", &c->vc); 633 spin_lock_irqsave(&c->vc.lock, flags); 634 if (c->status == DMA_PAUSED) { 635 c->status = DMA_IN_PROGRESS; 636 if (p) { 637 k3_dma_pause_dma(p, true); 638 } else if (!list_empty(&c->vc.desc_issued)) { 639 spin_lock(&d->lock); 640 list_add_tail(&c->node, &d->chan_pending); 641 spin_unlock(&d->lock); 642 } 643 } 644 spin_unlock_irqrestore(&c->vc.lock, flags); 645 646 return 0; 647 } 648 649 static void k3_dma_free_desc(struct virt_dma_desc *vd) 650 { 651 struct k3_dma_desc_sw *ds = 652 container_of(vd, struct k3_dma_desc_sw, vd); 653 654 kfree(ds); 655 } 656 657 static struct of_device_id k3_pdma_dt_ids[] = { 658 { .compatible = "hisilicon,k3-dma-1.0", }, 659 {} 660 }; 661 MODULE_DEVICE_TABLE(of, k3_pdma_dt_ids); 662 663 static struct dma_chan *k3_of_dma_simple_xlate(struct of_phandle_args *dma_spec, 664 struct of_dma *ofdma) 665 { 666 struct k3_dma_dev *d = ofdma->of_dma_data; 667 unsigned int request = dma_spec->args[0]; 668 669 if (request > d->dma_requests) 670 return NULL; 671 672 return dma_get_slave_channel(&(d->chans[request].vc.chan)); 673 } 674 675 static int k3_dma_probe(struct platform_device *op) 676 { 677 struct k3_dma_dev *d; 678 const struct of_device_id *of_id; 679 struct resource *iores; 680 int i, ret, irq = 0; 681 682 iores = platform_get_resource(op, IORESOURCE_MEM, 0); 683 if (!iores) 684 return -EINVAL; 685 686 d = devm_kzalloc(&op->dev, sizeof(*d), GFP_KERNEL); 687 if (!d) 688 return -ENOMEM; 689 690 d->base = devm_ioremap_resource(&op->dev, iores); 691 if (IS_ERR(d->base)) 692 return PTR_ERR(d->base); 693 694 of_id = of_match_device(k3_pdma_dt_ids, &op->dev); 695 if (of_id) { 696 of_property_read_u32((&op->dev)->of_node, 697 "dma-channels", &d->dma_channels); 698 of_property_read_u32((&op->dev)->of_node, 699 "dma-requests", &d->dma_requests); 700 } 701 702 d->clk = devm_clk_get(&op->dev, NULL); 703 if (IS_ERR(d->clk)) { 704 dev_err(&op->dev, "no dma clk\n"); 705 return PTR_ERR(d->clk); 706 } 707 708 irq = platform_get_irq(op, 0); 709 ret = devm_request_irq(&op->dev, irq, 710 k3_dma_int_handler, 0, DRIVER_NAME, d); 711 if (ret) 712 return ret; 713 714 /* init phy channel */ 715 d->phy = devm_kzalloc(&op->dev, 716 d->dma_channels * sizeof(struct k3_dma_phy), GFP_KERNEL); 717 if (d->phy == NULL) 718 return -ENOMEM; 719 720 for (i = 0; i < d->dma_channels; i++) { 721 struct k3_dma_phy *p = &d->phy[i]; 722 723 p->idx = i; 724 p->base = d->base + i * 0x40; 725 } 726 727 INIT_LIST_HEAD(&d->slave.channels); 728 dma_cap_set(DMA_SLAVE, d->slave.cap_mask); 729 dma_cap_set(DMA_MEMCPY, d->slave.cap_mask); 730 d->slave.dev = &op->dev; 731 d->slave.device_alloc_chan_resources = k3_dma_alloc_chan_resources; 732 d->slave.device_free_chan_resources = k3_dma_free_chan_resources; 733 d->slave.device_tx_status = k3_dma_tx_status; 734 d->slave.device_prep_dma_memcpy = k3_dma_prep_memcpy; 735 d->slave.device_prep_slave_sg = k3_dma_prep_slave_sg; 736 d->slave.device_issue_pending = k3_dma_issue_pending; 737 d->slave.device_config = k3_dma_config; 738 d->slave.device_pause = k3_dma_transfer_pause; 739 d->slave.device_resume = k3_dma_transfer_resume; 740 d->slave.device_terminate_all = k3_dma_terminate_all; 741 d->slave.copy_align = DMA_ALIGN; 742 743 /* init virtual channel */ 744 d->chans = devm_kzalloc(&op->dev, 745 d->dma_requests * sizeof(struct k3_dma_chan), GFP_KERNEL); 746 if (d->chans == NULL) 747 return -ENOMEM; 748 749 for (i = 0; i < d->dma_requests; i++) { 750 struct k3_dma_chan *c = &d->chans[i]; 751 752 c->status = DMA_IN_PROGRESS; 753 INIT_LIST_HEAD(&c->node); 754 c->vc.desc_free = k3_dma_free_desc; 755 vchan_init(&c->vc, &d->slave); 756 } 757 758 /* Enable clock before accessing registers */ 759 ret = clk_prepare_enable(d->clk); 760 if (ret < 0) { 761 dev_err(&op->dev, "clk_prepare_enable failed: %d\n", ret); 762 return ret; 763 } 764 765 k3_dma_enable_dma(d, true); 766 767 ret = dma_async_device_register(&d->slave); 768 if (ret) 769 return ret; 770 771 ret = of_dma_controller_register((&op->dev)->of_node, 772 k3_of_dma_simple_xlate, d); 773 if (ret) 774 goto of_dma_register_fail; 775 776 spin_lock_init(&d->lock); 777 INIT_LIST_HEAD(&d->chan_pending); 778 tasklet_init(&d->task, k3_dma_tasklet, (unsigned long)d); 779 platform_set_drvdata(op, d); 780 dev_info(&op->dev, "initialized\n"); 781 782 return 0; 783 784 of_dma_register_fail: 785 dma_async_device_unregister(&d->slave); 786 return ret; 787 } 788 789 static int k3_dma_remove(struct platform_device *op) 790 { 791 struct k3_dma_chan *c, *cn; 792 struct k3_dma_dev *d = platform_get_drvdata(op); 793 794 dma_async_device_unregister(&d->slave); 795 of_dma_controller_free((&op->dev)->of_node); 796 797 list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) { 798 list_del(&c->vc.chan.device_node); 799 tasklet_kill(&c->vc.task); 800 } 801 tasklet_kill(&d->task); 802 clk_disable_unprepare(d->clk); 803 return 0; 804 } 805 806 #ifdef CONFIG_PM_SLEEP 807 static int k3_dma_suspend_dev(struct device *dev) 808 { 809 struct k3_dma_dev *d = dev_get_drvdata(dev); 810 u32 stat = 0; 811 812 stat = k3_dma_get_chan_stat(d); 813 if (stat) { 814 dev_warn(d->slave.dev, 815 "chan %d is running fail to suspend\n", stat); 816 return -1; 817 } 818 k3_dma_enable_dma(d, false); 819 clk_disable_unprepare(d->clk); 820 return 0; 821 } 822 823 static int k3_dma_resume_dev(struct device *dev) 824 { 825 struct k3_dma_dev *d = dev_get_drvdata(dev); 826 int ret = 0; 827 828 ret = clk_prepare_enable(d->clk); 829 if (ret < 0) { 830 dev_err(d->slave.dev, "clk_prepare_enable failed: %d\n", ret); 831 return ret; 832 } 833 k3_dma_enable_dma(d, true); 834 return 0; 835 } 836 #endif 837 838 static SIMPLE_DEV_PM_OPS(k3_dma_pmops, k3_dma_suspend_dev, k3_dma_resume_dev); 839 840 static struct platform_driver k3_pdma_driver = { 841 .driver = { 842 .name = DRIVER_NAME, 843 .pm = &k3_dma_pmops, 844 .of_match_table = k3_pdma_dt_ids, 845 }, 846 .probe = k3_dma_probe, 847 .remove = k3_dma_remove, 848 }; 849 850 module_platform_driver(k3_pdma_driver); 851 852 MODULE_DESCRIPTION("Hisilicon k3 DMA Driver"); 853 MODULE_ALIAS("platform:k3dma"); 854 MODULE_LICENSE("GPL v2"); 855