1 /* 2 * Renesas SuperH DMA Engine support 3 * 4 * base is drivers/dma/flsdma.c 5 * 6 * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de> 7 * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> 8 * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. 9 * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. 10 * 11 * This is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * - DMA of SuperH does not have Hardware DMA chain mode. 17 * - MAX DMA size is 16MB. 18 * 19 */ 20 21 #include <linux/delay.h> 22 #include <linux/dmaengine.h> 23 #include <linux/err.h> 24 #include <linux/init.h> 25 #include <linux/interrupt.h> 26 #include <linux/kdebug.h> 27 #include <linux/module.h> 28 #include <linux/notifier.h> 29 #include <linux/of.h> 30 #include <linux/of_device.h> 31 #include <linux/platform_device.h> 32 #include <linux/pm_runtime.h> 33 #include <linux/rculist.h> 34 #include <linux/sh_dma.h> 35 #include <linux/slab.h> 36 #include <linux/spinlock.h> 37 38 #include "../dmaengine.h" 39 #include "shdma.h" 40 41 /* DMA registers */ 42 #define SAR 0x00 /* Source Address Register */ 43 #define DAR 0x04 /* Destination Address Register */ 44 #define TCR 0x08 /* Transfer Count Register */ 45 #define CHCR 0x0C /* Channel Control Register */ 46 #define DMAOR 0x40 /* DMA Operation Register */ 47 48 #define TEND 0x18 /* USB-DMAC */ 49 50 #define SH_DMAE_DRV_NAME "sh-dma-engine" 51 52 /* Default MEMCPY transfer size = 2^2 = 4 bytes */ 53 #define LOG2_DEFAULT_XFER_SIZE 2 54 #define SH_DMA_SLAVE_NUMBER 256 55 #define SH_DMA_TCR_MAX (16 * 1024 * 1024 - 1) 56 57 /* 58 * Used for write-side mutual exclusion for the global device list, 59 * read-side synchronization by way of RCU, and per-controller data. 60 */ 61 static DEFINE_SPINLOCK(sh_dmae_lock); 62 static LIST_HEAD(sh_dmae_devices); 63 64 /* 65 * Different DMAC implementations provide different ways to clear DMA channels: 66 * (1) none - no CHCLR registers are available 67 * (2) one CHCLR register per channel - 0 has to be written to it to clear 68 * channel buffers 69 * (3) one CHCLR per several channels - 1 has to be written to the bit, 70 * corresponding to the specific channel to reset it 71 */ 72 static void channel_clear(struct sh_dmae_chan *sh_dc) 73 { 74 struct sh_dmae_device *shdev = to_sh_dev(sh_dc); 75 const struct sh_dmae_channel *chan_pdata = shdev->pdata->channel + 76 sh_dc->shdma_chan.id; 77 u32 val = shdev->pdata->chclr_bitwise ? 1 << chan_pdata->chclr_bit : 0; 78 79 __raw_writel(val, shdev->chan_reg + chan_pdata->chclr_offset); 80 } 81 82 static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg) 83 { 84 __raw_writel(data, sh_dc->base + reg); 85 } 86 87 static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg) 88 { 89 return __raw_readl(sh_dc->base + reg); 90 } 91 92 static u16 dmaor_read(struct sh_dmae_device *shdev) 93 { 94 void __iomem *addr = shdev->chan_reg + DMAOR; 95 96 if (shdev->pdata->dmaor_is_32bit) 97 return __raw_readl(addr); 98 else 99 return __raw_readw(addr); 100 } 101 102 static void dmaor_write(struct sh_dmae_device *shdev, u16 data) 103 { 104 void __iomem *addr = shdev->chan_reg + DMAOR; 105 106 if (shdev->pdata->dmaor_is_32bit) 107 __raw_writel(data, addr); 108 else 109 __raw_writew(data, addr); 110 } 111 112 static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data) 113 { 114 struct sh_dmae_device *shdev = to_sh_dev(sh_dc); 115 116 __raw_writel(data, sh_dc->base + shdev->chcr_offset); 117 } 118 119 static u32 chcr_read(struct sh_dmae_chan *sh_dc) 120 { 121 struct sh_dmae_device *shdev = to_sh_dev(sh_dc); 122 123 return __raw_readl(sh_dc->base + shdev->chcr_offset); 124 } 125 126 /* 127 * Reset DMA controller 128 * 129 * SH7780 has two DMAOR register 130 */ 131 static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev) 132 { 133 unsigned short dmaor; 134 unsigned long flags; 135 136 spin_lock_irqsave(&sh_dmae_lock, flags); 137 138 dmaor = dmaor_read(shdev); 139 dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME)); 140 141 spin_unlock_irqrestore(&sh_dmae_lock, flags); 142 } 143 144 static int sh_dmae_rst(struct sh_dmae_device *shdev) 145 { 146 unsigned short dmaor; 147 unsigned long flags; 148 149 spin_lock_irqsave(&sh_dmae_lock, flags); 150 151 dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME); 152 153 if (shdev->pdata->chclr_present) { 154 int i; 155 for (i = 0; i < shdev->pdata->channel_num; i++) { 156 struct sh_dmae_chan *sh_chan = shdev->chan[i]; 157 if (sh_chan) 158 channel_clear(sh_chan); 159 } 160 } 161 162 dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init); 163 164 dmaor = dmaor_read(shdev); 165 166 spin_unlock_irqrestore(&sh_dmae_lock, flags); 167 168 if (dmaor & (DMAOR_AE | DMAOR_NMIF)) { 169 dev_warn(shdev->shdma_dev.dma_dev.dev, "Can't initialize DMAOR.\n"); 170 return -EIO; 171 } 172 if (shdev->pdata->dmaor_init & ~dmaor) 173 dev_warn(shdev->shdma_dev.dma_dev.dev, 174 "DMAOR=0x%x hasn't latched the initial value 0x%x.\n", 175 dmaor, shdev->pdata->dmaor_init); 176 return 0; 177 } 178 179 static bool dmae_is_busy(struct sh_dmae_chan *sh_chan) 180 { 181 u32 chcr = chcr_read(sh_chan); 182 183 if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE) 184 return true; /* working */ 185 186 return false; /* waiting */ 187 } 188 189 static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr) 190 { 191 struct sh_dmae_device *shdev = to_sh_dev(sh_chan); 192 const struct sh_dmae_pdata *pdata = shdev->pdata; 193 int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) | 194 ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift); 195 196 if (cnt >= pdata->ts_shift_num) 197 cnt = 0; 198 199 return pdata->ts_shift[cnt]; 200 } 201 202 static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size) 203 { 204 struct sh_dmae_device *shdev = to_sh_dev(sh_chan); 205 const struct sh_dmae_pdata *pdata = shdev->pdata; 206 int i; 207 208 for (i = 0; i < pdata->ts_shift_num; i++) 209 if (pdata->ts_shift[i] == l2size) 210 break; 211 212 if (i == pdata->ts_shift_num) 213 i = 0; 214 215 return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) | 216 ((i << pdata->ts_high_shift) & pdata->ts_high_mask); 217 } 218 219 static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw) 220 { 221 sh_dmae_writel(sh_chan, hw->sar, SAR); 222 sh_dmae_writel(sh_chan, hw->dar, DAR); 223 sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR); 224 } 225 226 static void dmae_start(struct sh_dmae_chan *sh_chan) 227 { 228 struct sh_dmae_device *shdev = to_sh_dev(sh_chan); 229 u32 chcr = chcr_read(sh_chan); 230 231 if (shdev->pdata->needs_tend_set) 232 sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND); 233 234 chcr |= CHCR_DE | shdev->chcr_ie_bit; 235 chcr_write(sh_chan, chcr & ~CHCR_TE); 236 } 237 238 static void dmae_init(struct sh_dmae_chan *sh_chan) 239 { 240 /* 241 * Default configuration for dual address memory-memory transfer. 242 */ 243 u32 chcr = DM_INC | SM_INC | RS_AUTO | log2size_to_chcr(sh_chan, 244 LOG2_DEFAULT_XFER_SIZE); 245 sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr); 246 chcr_write(sh_chan, chcr); 247 } 248 249 static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val) 250 { 251 /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */ 252 if (dmae_is_busy(sh_chan)) 253 return -EBUSY; 254 255 sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val); 256 chcr_write(sh_chan, val); 257 258 return 0; 259 } 260 261 static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val) 262 { 263 struct sh_dmae_device *shdev = to_sh_dev(sh_chan); 264 const struct sh_dmae_pdata *pdata = shdev->pdata; 265 const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->shdma_chan.id]; 266 void __iomem *addr = shdev->dmars; 267 unsigned int shift = chan_pdata->dmars_bit; 268 269 if (dmae_is_busy(sh_chan)) 270 return -EBUSY; 271 272 if (pdata->no_dmars) 273 return 0; 274 275 /* in the case of a missing DMARS resource use first memory window */ 276 if (!addr) 277 addr = shdev->chan_reg; 278 addr += chan_pdata->dmars; 279 280 __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift), 281 addr); 282 283 return 0; 284 } 285 286 static void sh_dmae_start_xfer(struct shdma_chan *schan, 287 struct shdma_desc *sdesc) 288 { 289 struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, 290 shdma_chan); 291 struct sh_dmae_desc *sh_desc = container_of(sdesc, 292 struct sh_dmae_desc, shdma_desc); 293 dev_dbg(sh_chan->shdma_chan.dev, "Queue #%d to %d: %u@%x -> %x\n", 294 sdesc->async_tx.cookie, sh_chan->shdma_chan.id, 295 sh_desc->hw.tcr, sh_desc->hw.sar, sh_desc->hw.dar); 296 /* Get the ld start address from ld_queue */ 297 dmae_set_reg(sh_chan, &sh_desc->hw); 298 dmae_start(sh_chan); 299 } 300 301 static bool sh_dmae_channel_busy(struct shdma_chan *schan) 302 { 303 struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, 304 shdma_chan); 305 return dmae_is_busy(sh_chan); 306 } 307 308 static void sh_dmae_setup_xfer(struct shdma_chan *schan, 309 int slave_id) 310 { 311 struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, 312 shdma_chan); 313 314 if (slave_id >= 0) { 315 const struct sh_dmae_slave_config *cfg = 316 sh_chan->config; 317 318 dmae_set_dmars(sh_chan, cfg->mid_rid); 319 dmae_set_chcr(sh_chan, cfg->chcr); 320 } else { 321 dmae_init(sh_chan); 322 } 323 } 324 325 /* 326 * Find a slave channel configuration from the contoller list by either a slave 327 * ID in the non-DT case, or by a MID/RID value in the DT case 328 */ 329 static const struct sh_dmae_slave_config *dmae_find_slave( 330 struct sh_dmae_chan *sh_chan, int match) 331 { 332 struct sh_dmae_device *shdev = to_sh_dev(sh_chan); 333 const struct sh_dmae_pdata *pdata = shdev->pdata; 334 const struct sh_dmae_slave_config *cfg; 335 int i; 336 337 if (!sh_chan->shdma_chan.dev->of_node) { 338 if (match >= SH_DMA_SLAVE_NUMBER) 339 return NULL; 340 341 for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) 342 if (cfg->slave_id == match) 343 return cfg; 344 } else { 345 for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) 346 if (cfg->mid_rid == match) { 347 sh_chan->shdma_chan.slave_id = i; 348 return cfg; 349 } 350 } 351 352 return NULL; 353 } 354 355 static int sh_dmae_set_slave(struct shdma_chan *schan, 356 int slave_id, dma_addr_t slave_addr, bool try) 357 { 358 struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, 359 shdma_chan); 360 const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave_id); 361 if (!cfg) 362 return -ENXIO; 363 364 if (!try) { 365 sh_chan->config = cfg; 366 sh_chan->slave_addr = slave_addr ? : cfg->addr; 367 } 368 369 return 0; 370 } 371 372 static void dmae_halt(struct sh_dmae_chan *sh_chan) 373 { 374 struct sh_dmae_device *shdev = to_sh_dev(sh_chan); 375 u32 chcr = chcr_read(sh_chan); 376 377 chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit); 378 chcr_write(sh_chan, chcr); 379 } 380 381 static int sh_dmae_desc_setup(struct shdma_chan *schan, 382 struct shdma_desc *sdesc, 383 dma_addr_t src, dma_addr_t dst, size_t *len) 384 { 385 struct sh_dmae_desc *sh_desc = container_of(sdesc, 386 struct sh_dmae_desc, shdma_desc); 387 388 if (*len > schan->max_xfer_len) 389 *len = schan->max_xfer_len; 390 391 sh_desc->hw.sar = src; 392 sh_desc->hw.dar = dst; 393 sh_desc->hw.tcr = *len; 394 395 return 0; 396 } 397 398 static void sh_dmae_halt(struct shdma_chan *schan) 399 { 400 struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, 401 shdma_chan); 402 dmae_halt(sh_chan); 403 } 404 405 static bool sh_dmae_chan_irq(struct shdma_chan *schan, int irq) 406 { 407 struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, 408 shdma_chan); 409 410 if (!(chcr_read(sh_chan) & CHCR_TE)) 411 return false; 412 413 /* DMA stop */ 414 dmae_halt(sh_chan); 415 416 return true; 417 } 418 419 static size_t sh_dmae_get_partial(struct shdma_chan *schan, 420 struct shdma_desc *sdesc) 421 { 422 struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, 423 shdma_chan); 424 struct sh_dmae_desc *sh_desc = container_of(sdesc, 425 struct sh_dmae_desc, shdma_desc); 426 return sh_desc->hw.tcr - 427 (sh_dmae_readl(sh_chan, TCR) << sh_chan->xmit_shift); 428 } 429 430 /* Called from error IRQ or NMI */ 431 static bool sh_dmae_reset(struct sh_dmae_device *shdev) 432 { 433 bool ret; 434 435 /* halt the dma controller */ 436 sh_dmae_ctl_stop(shdev); 437 438 /* We cannot detect, which channel caused the error, have to reset all */ 439 ret = shdma_reset(&shdev->shdma_dev); 440 441 sh_dmae_rst(shdev); 442 443 return ret; 444 } 445 446 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARM) 447 static irqreturn_t sh_dmae_err(int irq, void *data) 448 { 449 struct sh_dmae_device *shdev = data; 450 451 if (!(dmaor_read(shdev) & DMAOR_AE)) 452 return IRQ_NONE; 453 454 sh_dmae_reset(shdev); 455 return IRQ_HANDLED; 456 } 457 #endif 458 459 static bool sh_dmae_desc_completed(struct shdma_chan *schan, 460 struct shdma_desc *sdesc) 461 { 462 struct sh_dmae_chan *sh_chan = container_of(schan, 463 struct sh_dmae_chan, shdma_chan); 464 struct sh_dmae_desc *sh_desc = container_of(sdesc, 465 struct sh_dmae_desc, shdma_desc); 466 u32 sar_buf = sh_dmae_readl(sh_chan, SAR); 467 u32 dar_buf = sh_dmae_readl(sh_chan, DAR); 468 469 return (sdesc->direction == DMA_DEV_TO_MEM && 470 (sh_desc->hw.dar + sh_desc->hw.tcr) == dar_buf) || 471 (sdesc->direction != DMA_DEV_TO_MEM && 472 (sh_desc->hw.sar + sh_desc->hw.tcr) == sar_buf); 473 } 474 475 static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev) 476 { 477 /* Fast path out if NMIF is not asserted for this controller */ 478 if ((dmaor_read(shdev) & DMAOR_NMIF) == 0) 479 return false; 480 481 return sh_dmae_reset(shdev); 482 } 483 484 static int sh_dmae_nmi_handler(struct notifier_block *self, 485 unsigned long cmd, void *data) 486 { 487 struct sh_dmae_device *shdev; 488 int ret = NOTIFY_DONE; 489 bool triggered; 490 491 /* 492 * Only concern ourselves with NMI events. 493 * 494 * Normally we would check the die chain value, but as this needs 495 * to be architecture independent, check for NMI context instead. 496 */ 497 if (!in_nmi()) 498 return NOTIFY_DONE; 499 500 rcu_read_lock(); 501 list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) { 502 /* 503 * Only stop if one of the controllers has NMIF asserted, 504 * we do not want to interfere with regular address error 505 * handling or NMI events that don't concern the DMACs. 506 */ 507 triggered = sh_dmae_nmi_notify(shdev); 508 if (triggered == true) 509 ret = NOTIFY_OK; 510 } 511 rcu_read_unlock(); 512 513 return ret; 514 } 515 516 static struct notifier_block sh_dmae_nmi_notifier __read_mostly = { 517 .notifier_call = sh_dmae_nmi_handler, 518 519 /* Run before NMI debug handler and KGDB */ 520 .priority = 1, 521 }; 522 523 static int sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id, 524 int irq, unsigned long flags) 525 { 526 const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id]; 527 struct shdma_dev *sdev = &shdev->shdma_dev; 528 struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev); 529 struct sh_dmae_chan *sh_chan; 530 struct shdma_chan *schan; 531 int err; 532 533 sh_chan = devm_kzalloc(sdev->dma_dev.dev, sizeof(struct sh_dmae_chan), 534 GFP_KERNEL); 535 if (!sh_chan) { 536 dev_err(sdev->dma_dev.dev, 537 "No free memory for allocating dma channels!\n"); 538 return -ENOMEM; 539 } 540 541 schan = &sh_chan->shdma_chan; 542 schan->max_xfer_len = SH_DMA_TCR_MAX + 1; 543 544 shdma_chan_probe(sdev, schan, id); 545 546 sh_chan->base = shdev->chan_reg + chan_pdata->offset; 547 548 /* set up channel irq */ 549 if (pdev->id >= 0) 550 snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id), 551 "sh-dmae%d.%d", pdev->id, id); 552 else 553 snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id), 554 "sh-dma%d", id); 555 556 err = shdma_request_irq(schan, irq, flags, sh_chan->dev_id); 557 if (err) { 558 dev_err(sdev->dma_dev.dev, 559 "DMA channel %d request_irq error %d\n", 560 id, err); 561 goto err_no_irq; 562 } 563 564 shdev->chan[id] = sh_chan; 565 return 0; 566 567 err_no_irq: 568 /* remove from dmaengine device node */ 569 shdma_chan_remove(schan); 570 return err; 571 } 572 573 static void sh_dmae_chan_remove(struct sh_dmae_device *shdev) 574 { 575 struct shdma_chan *schan; 576 int i; 577 578 shdma_for_each_chan(schan, &shdev->shdma_dev, i) { 579 BUG_ON(!schan); 580 581 shdma_chan_remove(schan); 582 } 583 } 584 585 static void sh_dmae_shutdown(struct platform_device *pdev) 586 { 587 struct sh_dmae_device *shdev = platform_get_drvdata(pdev); 588 sh_dmae_ctl_stop(shdev); 589 } 590 591 static int sh_dmae_runtime_suspend(struct device *dev) 592 { 593 return 0; 594 } 595 596 static int sh_dmae_runtime_resume(struct device *dev) 597 { 598 struct sh_dmae_device *shdev = dev_get_drvdata(dev); 599 600 return sh_dmae_rst(shdev); 601 } 602 603 #ifdef CONFIG_PM 604 static int sh_dmae_suspend(struct device *dev) 605 { 606 return 0; 607 } 608 609 static int sh_dmae_resume(struct device *dev) 610 { 611 struct sh_dmae_device *shdev = dev_get_drvdata(dev); 612 int i, ret; 613 614 ret = sh_dmae_rst(shdev); 615 if (ret < 0) 616 dev_err(dev, "Failed to reset!\n"); 617 618 for (i = 0; i < shdev->pdata->channel_num; i++) { 619 struct sh_dmae_chan *sh_chan = shdev->chan[i]; 620 621 if (!sh_chan->shdma_chan.desc_num) 622 continue; 623 624 if (sh_chan->shdma_chan.slave_id >= 0) { 625 const struct sh_dmae_slave_config *cfg = sh_chan->config; 626 dmae_set_dmars(sh_chan, cfg->mid_rid); 627 dmae_set_chcr(sh_chan, cfg->chcr); 628 } else { 629 dmae_init(sh_chan); 630 } 631 } 632 633 return 0; 634 } 635 #else 636 #define sh_dmae_suspend NULL 637 #define sh_dmae_resume NULL 638 #endif 639 640 static const struct dev_pm_ops sh_dmae_pm = { 641 .suspend = sh_dmae_suspend, 642 .resume = sh_dmae_resume, 643 .runtime_suspend = sh_dmae_runtime_suspend, 644 .runtime_resume = sh_dmae_runtime_resume, 645 }; 646 647 static dma_addr_t sh_dmae_slave_addr(struct shdma_chan *schan) 648 { 649 struct sh_dmae_chan *sh_chan = container_of(schan, 650 struct sh_dmae_chan, shdma_chan); 651 652 /* 653 * Implicit BUG_ON(!sh_chan->config) 654 * This is an exclusive slave DMA operation, may only be called after a 655 * successful slave configuration. 656 */ 657 return sh_chan->slave_addr; 658 } 659 660 static struct shdma_desc *sh_dmae_embedded_desc(void *buf, int i) 661 { 662 return &((struct sh_dmae_desc *)buf)[i].shdma_desc; 663 } 664 665 static const struct shdma_ops sh_dmae_shdma_ops = { 666 .desc_completed = sh_dmae_desc_completed, 667 .halt_channel = sh_dmae_halt, 668 .channel_busy = sh_dmae_channel_busy, 669 .slave_addr = sh_dmae_slave_addr, 670 .desc_setup = sh_dmae_desc_setup, 671 .set_slave = sh_dmae_set_slave, 672 .setup_xfer = sh_dmae_setup_xfer, 673 .start_xfer = sh_dmae_start_xfer, 674 .embedded_desc = sh_dmae_embedded_desc, 675 .chan_irq = sh_dmae_chan_irq, 676 .get_partial = sh_dmae_get_partial, 677 }; 678 679 static const struct of_device_id sh_dmae_of_match[] = { 680 {.compatible = "renesas,shdma-r8a73a4", .data = r8a73a4_shdma_devid,}, 681 {} 682 }; 683 MODULE_DEVICE_TABLE(of, sh_dmae_of_match); 684 685 static int sh_dmae_probe(struct platform_device *pdev) 686 { 687 const struct sh_dmae_pdata *pdata; 688 unsigned long chan_flag[SH_DMAE_MAX_CHANNELS] = {}; 689 int chan_irq[SH_DMAE_MAX_CHANNELS]; 690 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARM) 691 unsigned long irqflags = 0; 692 int errirq; 693 #endif 694 int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0; 695 struct sh_dmae_device *shdev; 696 struct dma_device *dma_dev; 697 struct resource *chan, *dmars, *errirq_res, *chanirq_res; 698 699 if (pdev->dev.of_node) 700 pdata = of_match_device(sh_dmae_of_match, &pdev->dev)->data; 701 else 702 pdata = dev_get_platdata(&pdev->dev); 703 704 /* get platform data */ 705 if (!pdata || !pdata->channel_num) 706 return -ENODEV; 707 708 chan = platform_get_resource(pdev, IORESOURCE_MEM, 0); 709 /* DMARS area is optional */ 710 dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1); 711 /* 712 * IRQ resources: 713 * 1. there always must be at least one IRQ IO-resource. On SH4 it is 714 * the error IRQ, in which case it is the only IRQ in this resource: 715 * start == end. If it is the only IRQ resource, all channels also 716 * use the same IRQ. 717 * 2. DMA channel IRQ resources can be specified one per resource or in 718 * ranges (start != end) 719 * 3. iff all events (channels and, optionally, error) on this 720 * controller use the same IRQ, only one IRQ resource can be 721 * specified, otherwise there must be one IRQ per channel, even if 722 * some of them are equal 723 * 4. if all IRQs on this controller are equal or if some specific IRQs 724 * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be 725 * requested with the IRQF_SHARED flag 726 */ 727 errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 728 if (!chan || !errirq_res) 729 return -ENODEV; 730 731 shdev = devm_kzalloc(&pdev->dev, sizeof(struct sh_dmae_device), 732 GFP_KERNEL); 733 if (!shdev) { 734 dev_err(&pdev->dev, "Not enough memory\n"); 735 return -ENOMEM; 736 } 737 738 dma_dev = &shdev->shdma_dev.dma_dev; 739 740 shdev->chan_reg = devm_ioremap_resource(&pdev->dev, chan); 741 if (IS_ERR(shdev->chan_reg)) 742 return PTR_ERR(shdev->chan_reg); 743 if (dmars) { 744 shdev->dmars = devm_ioremap_resource(&pdev->dev, dmars); 745 if (IS_ERR(shdev->dmars)) 746 return PTR_ERR(shdev->dmars); 747 } 748 749 if (!pdata->slave_only) 750 dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); 751 if (pdata->slave && pdata->slave_num) 752 dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); 753 754 /* Default transfer size of 32 bytes requires 32-byte alignment */ 755 dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE; 756 757 shdev->shdma_dev.ops = &sh_dmae_shdma_ops; 758 shdev->shdma_dev.desc_size = sizeof(struct sh_dmae_desc); 759 err = shdma_init(&pdev->dev, &shdev->shdma_dev, 760 pdata->channel_num); 761 if (err < 0) 762 goto eshdma; 763 764 /* platform data */ 765 shdev->pdata = pdata; 766 767 if (pdata->chcr_offset) 768 shdev->chcr_offset = pdata->chcr_offset; 769 else 770 shdev->chcr_offset = CHCR; 771 772 if (pdata->chcr_ie_bit) 773 shdev->chcr_ie_bit = pdata->chcr_ie_bit; 774 else 775 shdev->chcr_ie_bit = CHCR_IE; 776 777 platform_set_drvdata(pdev, shdev); 778 779 pm_runtime_enable(&pdev->dev); 780 err = pm_runtime_get_sync(&pdev->dev); 781 if (err < 0) 782 dev_err(&pdev->dev, "%s(): GET = %d\n", __func__, err); 783 784 spin_lock_irq(&sh_dmae_lock); 785 list_add_tail_rcu(&shdev->node, &sh_dmae_devices); 786 spin_unlock_irq(&sh_dmae_lock); 787 788 /* reset dma controller - only needed as a test */ 789 err = sh_dmae_rst(shdev); 790 if (err) 791 goto rst_err; 792 793 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) 794 chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1); 795 796 if (!chanirq_res) 797 chanirq_res = errirq_res; 798 else 799 irqres++; 800 801 if (chanirq_res == errirq_res || 802 (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE) 803 irqflags = IRQF_SHARED; 804 805 errirq = errirq_res->start; 806 807 err = devm_request_irq(&pdev->dev, errirq, sh_dmae_err, irqflags, 808 "DMAC Address Error", shdev); 809 if (err) { 810 dev_err(&pdev->dev, 811 "DMA failed requesting irq #%d, error %d\n", 812 errirq, err); 813 goto eirq_err; 814 } 815 816 #else 817 chanirq_res = errirq_res; 818 #endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */ 819 820 if (chanirq_res->start == chanirq_res->end && 821 !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) { 822 /* Special case - all multiplexed */ 823 for (; irq_cnt < pdata->channel_num; irq_cnt++) { 824 if (irq_cnt < SH_DMAE_MAX_CHANNELS) { 825 chan_irq[irq_cnt] = chanirq_res->start; 826 chan_flag[irq_cnt] = IRQF_SHARED; 827 } else { 828 irq_cap = 1; 829 break; 830 } 831 } 832 } else { 833 do { 834 for (i = chanirq_res->start; i <= chanirq_res->end; i++) { 835 if (irq_cnt >= SH_DMAE_MAX_CHANNELS) { 836 irq_cap = 1; 837 break; 838 } 839 840 if ((errirq_res->flags & IORESOURCE_BITS) == 841 IORESOURCE_IRQ_SHAREABLE) 842 chan_flag[irq_cnt] = IRQF_SHARED; 843 else 844 chan_flag[irq_cnt] = 0; 845 dev_dbg(&pdev->dev, 846 "Found IRQ %d for channel %d\n", 847 i, irq_cnt); 848 chan_irq[irq_cnt++] = i; 849 } 850 851 if (irq_cnt >= SH_DMAE_MAX_CHANNELS) 852 break; 853 854 chanirq_res = platform_get_resource(pdev, 855 IORESOURCE_IRQ, ++irqres); 856 } while (irq_cnt < pdata->channel_num && chanirq_res); 857 } 858 859 /* Create DMA Channel */ 860 for (i = 0; i < irq_cnt; i++) { 861 err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]); 862 if (err) 863 goto chan_probe_err; 864 } 865 866 if (irq_cap) 867 dev_notice(&pdev->dev, "Attempting to register %d DMA " 868 "channels when a maximum of %d are supported.\n", 869 pdata->channel_num, SH_DMAE_MAX_CHANNELS); 870 871 pm_runtime_put(&pdev->dev); 872 873 err = dma_async_device_register(&shdev->shdma_dev.dma_dev); 874 if (err < 0) 875 goto edmadevreg; 876 877 return err; 878 879 edmadevreg: 880 pm_runtime_get(&pdev->dev); 881 882 chan_probe_err: 883 sh_dmae_chan_remove(shdev); 884 885 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) 886 eirq_err: 887 #endif 888 rst_err: 889 spin_lock_irq(&sh_dmae_lock); 890 list_del_rcu(&shdev->node); 891 spin_unlock_irq(&sh_dmae_lock); 892 893 pm_runtime_put(&pdev->dev); 894 pm_runtime_disable(&pdev->dev); 895 896 shdma_cleanup(&shdev->shdma_dev); 897 eshdma: 898 synchronize_rcu(); 899 900 return err; 901 } 902 903 static int sh_dmae_remove(struct platform_device *pdev) 904 { 905 struct sh_dmae_device *shdev = platform_get_drvdata(pdev); 906 struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev; 907 908 dma_async_device_unregister(dma_dev); 909 910 spin_lock_irq(&sh_dmae_lock); 911 list_del_rcu(&shdev->node); 912 spin_unlock_irq(&sh_dmae_lock); 913 914 pm_runtime_disable(&pdev->dev); 915 916 sh_dmae_chan_remove(shdev); 917 shdma_cleanup(&shdev->shdma_dev); 918 919 synchronize_rcu(); 920 921 return 0; 922 } 923 924 static struct platform_driver sh_dmae_driver = { 925 .driver = { 926 .pm = &sh_dmae_pm, 927 .name = SH_DMAE_DRV_NAME, 928 .of_match_table = sh_dmae_of_match, 929 }, 930 .remove = sh_dmae_remove, 931 .shutdown = sh_dmae_shutdown, 932 }; 933 934 static int __init sh_dmae_init(void) 935 { 936 /* Wire up NMI handling */ 937 int err = register_die_notifier(&sh_dmae_nmi_notifier); 938 if (err) 939 return err; 940 941 return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe); 942 } 943 module_init(sh_dmae_init); 944 945 static void __exit sh_dmae_exit(void) 946 { 947 platform_driver_unregister(&sh_dmae_driver); 948 949 unregister_die_notifier(&sh_dmae_nmi_notifier); 950 } 951 module_exit(sh_dmae_exit); 952 953 MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>"); 954 MODULE_DESCRIPTION("Renesas SH DMA Engine driver"); 955 MODULE_LICENSE("GPL"); 956 MODULE_ALIAS("platform:" SH_DMAE_DRV_NAME); 957