1 /* 2 * drivers/dma/imx-dma.c 3 * 4 * This file contains a driver for the Freescale i.MX DMA engine 5 * found on i.MX1/21/27 6 * 7 * Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> 8 * Copyright 2012 Javier Martin, Vista Silicon <javier.martin@vista-silicon.com> 9 * 10 * The code contained herein is licensed under the GNU General Public 11 * License. You may obtain a copy of the GNU General Public License 12 * Version 2 or later at the following locations: 13 * 14 * http://www.opensource.org/licenses/gpl-license.html 15 * http://www.gnu.org/copyleft/gpl.html 16 */ 17 #include <linux/err.h> 18 #include <linux/init.h> 19 #include <linux/types.h> 20 #include <linux/mm.h> 21 #include <linux/interrupt.h> 22 #include <linux/spinlock.h> 23 #include <linux/device.h> 24 #include <linux/dma-mapping.h> 25 #include <linux/slab.h> 26 #include <linux/platform_device.h> 27 #include <linux/clk.h> 28 #include <linux/dmaengine.h> 29 #include <linux/module.h> 30 #include <linux/of_device.h> 31 #include <linux/of_dma.h> 32 33 #include <asm/irq.h> 34 #include <linux/platform_data/dma-imx.h> 35 36 #include "dmaengine.h" 37 #define IMXDMA_MAX_CHAN_DESCRIPTORS 16 38 #define IMX_DMA_CHANNELS 16 39 40 #define IMX_DMA_2D_SLOTS 2 41 #define IMX_DMA_2D_SLOT_A 0 42 #define IMX_DMA_2D_SLOT_B 1 43 44 #define IMX_DMA_LENGTH_LOOP ((unsigned int)-1) 45 #define IMX_DMA_MEMSIZE_32 (0 << 4) 46 #define IMX_DMA_MEMSIZE_8 (1 << 4) 47 #define IMX_DMA_MEMSIZE_16 (2 << 4) 48 #define IMX_DMA_TYPE_LINEAR (0 << 10) 49 #define IMX_DMA_TYPE_2D (1 << 10) 50 #define IMX_DMA_TYPE_FIFO (2 << 10) 51 52 #define IMX_DMA_ERR_BURST (1 << 0) 53 #define IMX_DMA_ERR_REQUEST (1 << 1) 54 #define IMX_DMA_ERR_TRANSFER (1 << 2) 55 #define IMX_DMA_ERR_BUFFER (1 << 3) 56 #define IMX_DMA_ERR_TIMEOUT (1 << 4) 57 58 #define DMA_DCR 0x00 /* Control Register */ 59 #define DMA_DISR 0x04 /* Interrupt status Register */ 60 #define DMA_DIMR 0x08 /* Interrupt mask Register */ 61 #define DMA_DBTOSR 0x0c /* Burst timeout status Register */ 62 #define DMA_DRTOSR 0x10 /* Request timeout Register */ 63 #define DMA_DSESR 0x14 /* Transfer Error Status Register */ 64 #define DMA_DBOSR 0x18 /* Buffer overflow status Register */ 65 #define DMA_DBTOCR 0x1c /* Burst timeout control Register */ 66 #define DMA_WSRA 0x40 /* W-Size Register A */ 67 #define DMA_XSRA 0x44 /* X-Size Register A */ 68 #define DMA_YSRA 0x48 /* Y-Size Register A */ 69 #define DMA_WSRB 0x4c /* W-Size Register B */ 70 #define DMA_XSRB 0x50 /* X-Size Register B */ 71 #define DMA_YSRB 0x54 /* Y-Size Register B */ 72 #define DMA_SAR(x) (0x80 + ((x) << 6)) /* Source Address Registers */ 73 #define DMA_DAR(x) (0x84 + ((x) << 6)) /* Destination Address Registers */ 74 #define DMA_CNTR(x) (0x88 + ((x) << 6)) /* Count Registers */ 75 #define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control Registers */ 76 #define DMA_RSSR(x) (0x90 + ((x) << 6)) /* Request source select Registers */ 77 #define DMA_BLR(x) (0x94 + ((x) << 6)) /* Burst length Registers */ 78 #define DMA_RTOR(x) (0x98 + ((x) << 6)) /* Request timeout Registers */ 79 #define DMA_BUCR(x) (0x98 + ((x) << 6)) /* Bus Utilization Registers */ 80 #define DMA_CCNR(x) (0x9C + ((x) << 6)) /* Channel counter Registers */ 81 82 #define DCR_DRST (1<<1) 83 #define DCR_DEN (1<<0) 84 #define DBTOCR_EN (1<<15) 85 #define DBTOCR_CNT(x) ((x) & 0x7fff) 86 #define CNTR_CNT(x) ((x) & 0xffffff) 87 #define CCR_ACRPT (1<<14) 88 #define CCR_DMOD_LINEAR (0x0 << 12) 89 #define CCR_DMOD_2D (0x1 << 12) 90 #define CCR_DMOD_FIFO (0x2 << 12) 91 #define CCR_DMOD_EOBFIFO (0x3 << 12) 92 #define CCR_SMOD_LINEAR (0x0 << 10) 93 #define CCR_SMOD_2D (0x1 << 10) 94 #define CCR_SMOD_FIFO (0x2 << 10) 95 #define CCR_SMOD_EOBFIFO (0x3 << 10) 96 #define CCR_MDIR_DEC (1<<9) 97 #define CCR_MSEL_B (1<<8) 98 #define CCR_DSIZ_32 (0x0 << 6) 99 #define CCR_DSIZ_8 (0x1 << 6) 100 #define CCR_DSIZ_16 (0x2 << 6) 101 #define CCR_SSIZ_32 (0x0 << 4) 102 #define CCR_SSIZ_8 (0x1 << 4) 103 #define CCR_SSIZ_16 (0x2 << 4) 104 #define CCR_REN (1<<3) 105 #define CCR_RPT (1<<2) 106 #define CCR_FRC (1<<1) 107 #define CCR_CEN (1<<0) 108 #define RTOR_EN (1<<15) 109 #define RTOR_CLK (1<<14) 110 #define RTOR_PSC (1<<13) 111 112 enum imxdma_prep_type { 113 IMXDMA_DESC_MEMCPY, 114 IMXDMA_DESC_INTERLEAVED, 115 IMXDMA_DESC_SLAVE_SG, 116 IMXDMA_DESC_CYCLIC, 117 }; 118 119 struct imx_dma_2d_config { 120 u16 xsr; 121 u16 ysr; 122 u16 wsr; 123 int count; 124 }; 125 126 struct imxdma_desc { 127 struct list_head node; 128 struct dma_async_tx_descriptor desc; 129 enum dma_status status; 130 dma_addr_t src; 131 dma_addr_t dest; 132 size_t len; 133 enum dma_transfer_direction direction; 134 enum imxdma_prep_type type; 135 /* For memcpy and interleaved */ 136 unsigned int config_port; 137 unsigned int config_mem; 138 /* For interleaved transfers */ 139 unsigned int x; 140 unsigned int y; 141 unsigned int w; 142 /* For slave sg and cyclic */ 143 struct scatterlist *sg; 144 unsigned int sgcount; 145 }; 146 147 struct imxdma_channel { 148 int hw_chaining; 149 struct timer_list watchdog; 150 struct imxdma_engine *imxdma; 151 unsigned int channel; 152 153 struct tasklet_struct dma_tasklet; 154 struct list_head ld_free; 155 struct list_head ld_queue; 156 struct list_head ld_active; 157 int descs_allocated; 158 enum dma_slave_buswidth word_size; 159 dma_addr_t per_address; 160 u32 watermark_level; 161 struct dma_chan chan; 162 struct dma_async_tx_descriptor desc; 163 enum dma_status status; 164 int dma_request; 165 struct scatterlist *sg_list; 166 u32 ccr_from_device; 167 u32 ccr_to_device; 168 bool enabled_2d; 169 int slot_2d; 170 unsigned int irq; 171 }; 172 173 enum imx_dma_type { 174 IMX1_DMA, 175 IMX21_DMA, 176 IMX27_DMA, 177 }; 178 179 struct imxdma_engine { 180 struct device *dev; 181 struct device_dma_parameters dma_parms; 182 struct dma_device dma_device; 183 void __iomem *base; 184 struct clk *dma_ahb; 185 struct clk *dma_ipg; 186 spinlock_t lock; 187 struct imx_dma_2d_config slots_2d[IMX_DMA_2D_SLOTS]; 188 struct imxdma_channel channel[IMX_DMA_CHANNELS]; 189 enum imx_dma_type devtype; 190 unsigned int irq; 191 unsigned int irq_err; 192 193 }; 194 195 struct imxdma_filter_data { 196 struct imxdma_engine *imxdma; 197 int request; 198 }; 199 200 static const struct platform_device_id imx_dma_devtype[] = { 201 { 202 .name = "imx1-dma", 203 .driver_data = IMX1_DMA, 204 }, { 205 .name = "imx21-dma", 206 .driver_data = IMX21_DMA, 207 }, { 208 .name = "imx27-dma", 209 .driver_data = IMX27_DMA, 210 }, { 211 /* sentinel */ 212 } 213 }; 214 MODULE_DEVICE_TABLE(platform, imx_dma_devtype); 215 216 static const struct of_device_id imx_dma_of_dev_id[] = { 217 { 218 .compatible = "fsl,imx1-dma", 219 .data = &imx_dma_devtype[IMX1_DMA], 220 }, { 221 .compatible = "fsl,imx21-dma", 222 .data = &imx_dma_devtype[IMX21_DMA], 223 }, { 224 .compatible = "fsl,imx27-dma", 225 .data = &imx_dma_devtype[IMX27_DMA], 226 }, { 227 /* sentinel */ 228 } 229 }; 230 MODULE_DEVICE_TABLE(of, imx_dma_of_dev_id); 231 232 static inline int is_imx1_dma(struct imxdma_engine *imxdma) 233 { 234 return imxdma->devtype == IMX1_DMA; 235 } 236 237 static inline int is_imx27_dma(struct imxdma_engine *imxdma) 238 { 239 return imxdma->devtype == IMX27_DMA; 240 } 241 242 static struct imxdma_channel *to_imxdma_chan(struct dma_chan *chan) 243 { 244 return container_of(chan, struct imxdma_channel, chan); 245 } 246 247 static inline bool imxdma_chan_is_doing_cyclic(struct imxdma_channel *imxdmac) 248 { 249 struct imxdma_desc *desc; 250 251 if (!list_empty(&imxdmac->ld_active)) { 252 desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, 253 node); 254 if (desc->type == IMXDMA_DESC_CYCLIC) 255 return true; 256 } 257 return false; 258 } 259 260 261 262 static void imx_dmav1_writel(struct imxdma_engine *imxdma, unsigned val, 263 unsigned offset) 264 { 265 __raw_writel(val, imxdma->base + offset); 266 } 267 268 static unsigned imx_dmav1_readl(struct imxdma_engine *imxdma, unsigned offset) 269 { 270 return __raw_readl(imxdma->base + offset); 271 } 272 273 static int imxdma_hw_chain(struct imxdma_channel *imxdmac) 274 { 275 struct imxdma_engine *imxdma = imxdmac->imxdma; 276 277 if (is_imx27_dma(imxdma)) 278 return imxdmac->hw_chaining; 279 else 280 return 0; 281 } 282 283 /* 284 * imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation 285 */ 286 static inline int imxdma_sg_next(struct imxdma_desc *d) 287 { 288 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan); 289 struct imxdma_engine *imxdma = imxdmac->imxdma; 290 struct scatterlist *sg = d->sg; 291 unsigned long now; 292 293 now = min(d->len, sg_dma_len(sg)); 294 if (d->len != IMX_DMA_LENGTH_LOOP) 295 d->len -= now; 296 297 if (d->direction == DMA_DEV_TO_MEM) 298 imx_dmav1_writel(imxdma, sg->dma_address, 299 DMA_DAR(imxdmac->channel)); 300 else 301 imx_dmav1_writel(imxdma, sg->dma_address, 302 DMA_SAR(imxdmac->channel)); 303 304 imx_dmav1_writel(imxdma, now, DMA_CNTR(imxdmac->channel)); 305 306 dev_dbg(imxdma->dev, " %s channel: %d dst 0x%08x, src 0x%08x, " 307 "size 0x%08x\n", __func__, imxdmac->channel, 308 imx_dmav1_readl(imxdma, DMA_DAR(imxdmac->channel)), 309 imx_dmav1_readl(imxdma, DMA_SAR(imxdmac->channel)), 310 imx_dmav1_readl(imxdma, DMA_CNTR(imxdmac->channel))); 311 312 return now; 313 } 314 315 static void imxdma_enable_hw(struct imxdma_desc *d) 316 { 317 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan); 318 struct imxdma_engine *imxdma = imxdmac->imxdma; 319 int channel = imxdmac->channel; 320 unsigned long flags; 321 322 dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel); 323 324 local_irq_save(flags); 325 326 imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR); 327 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) & 328 ~(1 << channel), DMA_DIMR); 329 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) | 330 CCR_CEN | CCR_ACRPT, DMA_CCR(channel)); 331 332 if (!is_imx1_dma(imxdma) && 333 d->sg && imxdma_hw_chain(imxdmac)) { 334 d->sg = sg_next(d->sg); 335 if (d->sg) { 336 u32 tmp; 337 imxdma_sg_next(d); 338 tmp = imx_dmav1_readl(imxdma, DMA_CCR(channel)); 339 imx_dmav1_writel(imxdma, tmp | CCR_RPT | CCR_ACRPT, 340 DMA_CCR(channel)); 341 } 342 } 343 344 local_irq_restore(flags); 345 } 346 347 static void imxdma_disable_hw(struct imxdma_channel *imxdmac) 348 { 349 struct imxdma_engine *imxdma = imxdmac->imxdma; 350 int channel = imxdmac->channel; 351 unsigned long flags; 352 353 dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel); 354 355 if (imxdma_hw_chain(imxdmac)) 356 del_timer(&imxdmac->watchdog); 357 358 local_irq_save(flags); 359 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) | 360 (1 << channel), DMA_DIMR); 361 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) & 362 ~CCR_CEN, DMA_CCR(channel)); 363 imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR); 364 local_irq_restore(flags); 365 } 366 367 static void imxdma_watchdog(struct timer_list *t) 368 { 369 struct imxdma_channel *imxdmac = from_timer(imxdmac, t, watchdog); 370 struct imxdma_engine *imxdma = imxdmac->imxdma; 371 int channel = imxdmac->channel; 372 373 imx_dmav1_writel(imxdma, 0, DMA_CCR(channel)); 374 375 /* Tasklet watchdog error handler */ 376 tasklet_schedule(&imxdmac->dma_tasklet); 377 dev_dbg(imxdma->dev, "channel %d: watchdog timeout!\n", 378 imxdmac->channel); 379 } 380 381 static irqreturn_t imxdma_err_handler(int irq, void *dev_id) 382 { 383 struct imxdma_engine *imxdma = dev_id; 384 unsigned int err_mask; 385 int i, disr; 386 int errcode; 387 388 disr = imx_dmav1_readl(imxdma, DMA_DISR); 389 390 err_mask = imx_dmav1_readl(imxdma, DMA_DBTOSR) | 391 imx_dmav1_readl(imxdma, DMA_DRTOSR) | 392 imx_dmav1_readl(imxdma, DMA_DSESR) | 393 imx_dmav1_readl(imxdma, DMA_DBOSR); 394 395 if (!err_mask) 396 return IRQ_HANDLED; 397 398 imx_dmav1_writel(imxdma, disr & err_mask, DMA_DISR); 399 400 for (i = 0; i < IMX_DMA_CHANNELS; i++) { 401 if (!(err_mask & (1 << i))) 402 continue; 403 errcode = 0; 404 405 if (imx_dmav1_readl(imxdma, DMA_DBTOSR) & (1 << i)) { 406 imx_dmav1_writel(imxdma, 1 << i, DMA_DBTOSR); 407 errcode |= IMX_DMA_ERR_BURST; 408 } 409 if (imx_dmav1_readl(imxdma, DMA_DRTOSR) & (1 << i)) { 410 imx_dmav1_writel(imxdma, 1 << i, DMA_DRTOSR); 411 errcode |= IMX_DMA_ERR_REQUEST; 412 } 413 if (imx_dmav1_readl(imxdma, DMA_DSESR) & (1 << i)) { 414 imx_dmav1_writel(imxdma, 1 << i, DMA_DSESR); 415 errcode |= IMX_DMA_ERR_TRANSFER; 416 } 417 if (imx_dmav1_readl(imxdma, DMA_DBOSR) & (1 << i)) { 418 imx_dmav1_writel(imxdma, 1 << i, DMA_DBOSR); 419 errcode |= IMX_DMA_ERR_BUFFER; 420 } 421 /* Tasklet error handler */ 422 tasklet_schedule(&imxdma->channel[i].dma_tasklet); 423 424 dev_warn(imxdma->dev, 425 "DMA timeout on channel %d -%s%s%s%s\n", i, 426 errcode & IMX_DMA_ERR_BURST ? " burst" : "", 427 errcode & IMX_DMA_ERR_REQUEST ? " request" : "", 428 errcode & IMX_DMA_ERR_TRANSFER ? " transfer" : "", 429 errcode & IMX_DMA_ERR_BUFFER ? " buffer" : ""); 430 } 431 return IRQ_HANDLED; 432 } 433 434 static void dma_irq_handle_channel(struct imxdma_channel *imxdmac) 435 { 436 struct imxdma_engine *imxdma = imxdmac->imxdma; 437 int chno = imxdmac->channel; 438 struct imxdma_desc *desc; 439 unsigned long flags; 440 441 spin_lock_irqsave(&imxdma->lock, flags); 442 if (list_empty(&imxdmac->ld_active)) { 443 spin_unlock_irqrestore(&imxdma->lock, flags); 444 goto out; 445 } 446 447 desc = list_first_entry(&imxdmac->ld_active, 448 struct imxdma_desc, 449 node); 450 spin_unlock_irqrestore(&imxdma->lock, flags); 451 452 if (desc->sg) { 453 u32 tmp; 454 desc->sg = sg_next(desc->sg); 455 456 if (desc->sg) { 457 imxdma_sg_next(desc); 458 459 tmp = imx_dmav1_readl(imxdma, DMA_CCR(chno)); 460 461 if (imxdma_hw_chain(imxdmac)) { 462 /* FIXME: The timeout should probably be 463 * configurable 464 */ 465 mod_timer(&imxdmac->watchdog, 466 jiffies + msecs_to_jiffies(500)); 467 468 tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT; 469 imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno)); 470 } else { 471 imx_dmav1_writel(imxdma, tmp & ~CCR_CEN, 472 DMA_CCR(chno)); 473 tmp |= CCR_CEN; 474 } 475 476 imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno)); 477 478 if (imxdma_chan_is_doing_cyclic(imxdmac)) 479 /* Tasklet progression */ 480 tasklet_schedule(&imxdmac->dma_tasklet); 481 482 return; 483 } 484 485 if (imxdma_hw_chain(imxdmac)) { 486 del_timer(&imxdmac->watchdog); 487 return; 488 } 489 } 490 491 out: 492 imx_dmav1_writel(imxdma, 0, DMA_CCR(chno)); 493 /* Tasklet irq */ 494 tasklet_schedule(&imxdmac->dma_tasklet); 495 } 496 497 static irqreturn_t dma_irq_handler(int irq, void *dev_id) 498 { 499 struct imxdma_engine *imxdma = dev_id; 500 int i, disr; 501 502 if (!is_imx1_dma(imxdma)) 503 imxdma_err_handler(irq, dev_id); 504 505 disr = imx_dmav1_readl(imxdma, DMA_DISR); 506 507 dev_dbg(imxdma->dev, "%s called, disr=0x%08x\n", __func__, disr); 508 509 imx_dmav1_writel(imxdma, disr, DMA_DISR); 510 for (i = 0; i < IMX_DMA_CHANNELS; i++) { 511 if (disr & (1 << i)) 512 dma_irq_handle_channel(&imxdma->channel[i]); 513 } 514 515 return IRQ_HANDLED; 516 } 517 518 static int imxdma_xfer_desc(struct imxdma_desc *d) 519 { 520 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan); 521 struct imxdma_engine *imxdma = imxdmac->imxdma; 522 int slot = -1; 523 int i; 524 525 /* Configure and enable */ 526 switch (d->type) { 527 case IMXDMA_DESC_INTERLEAVED: 528 /* Try to get a free 2D slot */ 529 for (i = 0; i < IMX_DMA_2D_SLOTS; i++) { 530 if ((imxdma->slots_2d[i].count > 0) && 531 ((imxdma->slots_2d[i].xsr != d->x) || 532 (imxdma->slots_2d[i].ysr != d->y) || 533 (imxdma->slots_2d[i].wsr != d->w))) 534 continue; 535 slot = i; 536 break; 537 } 538 if (slot < 0) 539 return -EBUSY; 540 541 imxdma->slots_2d[slot].xsr = d->x; 542 imxdma->slots_2d[slot].ysr = d->y; 543 imxdma->slots_2d[slot].wsr = d->w; 544 imxdma->slots_2d[slot].count++; 545 546 imxdmac->slot_2d = slot; 547 imxdmac->enabled_2d = true; 548 549 if (slot == IMX_DMA_2D_SLOT_A) { 550 d->config_mem &= ~CCR_MSEL_B; 551 d->config_port &= ~CCR_MSEL_B; 552 imx_dmav1_writel(imxdma, d->x, DMA_XSRA); 553 imx_dmav1_writel(imxdma, d->y, DMA_YSRA); 554 imx_dmav1_writel(imxdma, d->w, DMA_WSRA); 555 } else { 556 d->config_mem |= CCR_MSEL_B; 557 d->config_port |= CCR_MSEL_B; 558 imx_dmav1_writel(imxdma, d->x, DMA_XSRB); 559 imx_dmav1_writel(imxdma, d->y, DMA_YSRB); 560 imx_dmav1_writel(imxdma, d->w, DMA_WSRB); 561 } 562 /* 563 * We fall-through here intentionally, since a 2D transfer is 564 * similar to MEMCPY just adding the 2D slot configuration. 565 */ 566 case IMXDMA_DESC_MEMCPY: 567 imx_dmav1_writel(imxdma, d->src, DMA_SAR(imxdmac->channel)); 568 imx_dmav1_writel(imxdma, d->dest, DMA_DAR(imxdmac->channel)); 569 imx_dmav1_writel(imxdma, d->config_mem | (d->config_port << 2), 570 DMA_CCR(imxdmac->channel)); 571 572 imx_dmav1_writel(imxdma, d->len, DMA_CNTR(imxdmac->channel)); 573 574 dev_dbg(imxdma->dev, 575 "%s channel: %d dest=0x%08llx src=0x%08llx dma_length=%zu\n", 576 __func__, imxdmac->channel, 577 (unsigned long long)d->dest, 578 (unsigned long long)d->src, d->len); 579 580 break; 581 /* Cyclic transfer is the same as slave_sg with special sg configuration. */ 582 case IMXDMA_DESC_CYCLIC: 583 case IMXDMA_DESC_SLAVE_SG: 584 if (d->direction == DMA_DEV_TO_MEM) { 585 imx_dmav1_writel(imxdma, imxdmac->per_address, 586 DMA_SAR(imxdmac->channel)); 587 imx_dmav1_writel(imxdma, imxdmac->ccr_from_device, 588 DMA_CCR(imxdmac->channel)); 589 590 dev_dbg(imxdma->dev, 591 "%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (dev2mem)\n", 592 __func__, imxdmac->channel, 593 d->sg, d->sgcount, d->len, 594 (unsigned long long)imxdmac->per_address); 595 } else if (d->direction == DMA_MEM_TO_DEV) { 596 imx_dmav1_writel(imxdma, imxdmac->per_address, 597 DMA_DAR(imxdmac->channel)); 598 imx_dmav1_writel(imxdma, imxdmac->ccr_to_device, 599 DMA_CCR(imxdmac->channel)); 600 601 dev_dbg(imxdma->dev, 602 "%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (mem2dev)\n", 603 __func__, imxdmac->channel, 604 d->sg, d->sgcount, d->len, 605 (unsigned long long)imxdmac->per_address); 606 } else { 607 dev_err(imxdma->dev, "%s channel: %d bad dma mode\n", 608 __func__, imxdmac->channel); 609 return -EINVAL; 610 } 611 612 imxdma_sg_next(d); 613 614 break; 615 default: 616 return -EINVAL; 617 } 618 imxdma_enable_hw(d); 619 return 0; 620 } 621 622 static void imxdma_tasklet(unsigned long data) 623 { 624 struct imxdma_channel *imxdmac = (void *)data; 625 struct imxdma_engine *imxdma = imxdmac->imxdma; 626 struct imxdma_desc *desc; 627 unsigned long flags; 628 629 spin_lock_irqsave(&imxdma->lock, flags); 630 631 if (list_empty(&imxdmac->ld_active)) { 632 /* Someone might have called terminate all */ 633 spin_unlock_irqrestore(&imxdma->lock, flags); 634 return; 635 } 636 desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node); 637 638 /* If we are dealing with a cyclic descriptor, keep it on ld_active 639 * and dont mark the descriptor as complete. 640 * Only in non-cyclic cases it would be marked as complete 641 */ 642 if (imxdma_chan_is_doing_cyclic(imxdmac)) 643 goto out; 644 else 645 dma_cookie_complete(&desc->desc); 646 647 /* Free 2D slot if it was an interleaved transfer */ 648 if (imxdmac->enabled_2d) { 649 imxdma->slots_2d[imxdmac->slot_2d].count--; 650 imxdmac->enabled_2d = false; 651 } 652 653 list_move_tail(imxdmac->ld_active.next, &imxdmac->ld_free); 654 655 if (!list_empty(&imxdmac->ld_queue)) { 656 desc = list_first_entry(&imxdmac->ld_queue, struct imxdma_desc, 657 node); 658 list_move_tail(imxdmac->ld_queue.next, &imxdmac->ld_active); 659 if (imxdma_xfer_desc(desc) < 0) 660 dev_warn(imxdma->dev, "%s: channel: %d couldn't xfer desc\n", 661 __func__, imxdmac->channel); 662 } 663 out: 664 spin_unlock_irqrestore(&imxdma->lock, flags); 665 666 dmaengine_desc_get_callback_invoke(&desc->desc, NULL); 667 } 668 669 static int imxdma_terminate_all(struct dma_chan *chan) 670 { 671 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 672 struct imxdma_engine *imxdma = imxdmac->imxdma; 673 unsigned long flags; 674 675 imxdma_disable_hw(imxdmac); 676 677 spin_lock_irqsave(&imxdma->lock, flags); 678 list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free); 679 list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free); 680 spin_unlock_irqrestore(&imxdma->lock, flags); 681 return 0; 682 } 683 684 static int imxdma_config(struct dma_chan *chan, 685 struct dma_slave_config *dmaengine_cfg) 686 { 687 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 688 struct imxdma_engine *imxdma = imxdmac->imxdma; 689 unsigned int mode = 0; 690 691 if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) { 692 imxdmac->per_address = dmaengine_cfg->src_addr; 693 imxdmac->watermark_level = dmaengine_cfg->src_maxburst; 694 imxdmac->word_size = dmaengine_cfg->src_addr_width; 695 } else { 696 imxdmac->per_address = dmaengine_cfg->dst_addr; 697 imxdmac->watermark_level = dmaengine_cfg->dst_maxburst; 698 imxdmac->word_size = dmaengine_cfg->dst_addr_width; 699 } 700 701 switch (imxdmac->word_size) { 702 case DMA_SLAVE_BUSWIDTH_1_BYTE: 703 mode = IMX_DMA_MEMSIZE_8; 704 break; 705 case DMA_SLAVE_BUSWIDTH_2_BYTES: 706 mode = IMX_DMA_MEMSIZE_16; 707 break; 708 default: 709 case DMA_SLAVE_BUSWIDTH_4_BYTES: 710 mode = IMX_DMA_MEMSIZE_32; 711 break; 712 } 713 714 imxdmac->hw_chaining = 0; 715 716 imxdmac->ccr_from_device = (mode | IMX_DMA_TYPE_FIFO) | 717 ((IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) << 2) | 718 CCR_REN; 719 imxdmac->ccr_to_device = 720 (IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) | 721 ((mode | IMX_DMA_TYPE_FIFO) << 2) | CCR_REN; 722 imx_dmav1_writel(imxdma, imxdmac->dma_request, 723 DMA_RSSR(imxdmac->channel)); 724 725 /* Set burst length */ 726 imx_dmav1_writel(imxdma, imxdmac->watermark_level * 727 imxdmac->word_size, DMA_BLR(imxdmac->channel)); 728 729 return 0; 730 } 731 732 static enum dma_status imxdma_tx_status(struct dma_chan *chan, 733 dma_cookie_t cookie, 734 struct dma_tx_state *txstate) 735 { 736 return dma_cookie_status(chan, cookie, txstate); 737 } 738 739 static dma_cookie_t imxdma_tx_submit(struct dma_async_tx_descriptor *tx) 740 { 741 struct imxdma_channel *imxdmac = to_imxdma_chan(tx->chan); 742 struct imxdma_engine *imxdma = imxdmac->imxdma; 743 dma_cookie_t cookie; 744 unsigned long flags; 745 746 spin_lock_irqsave(&imxdma->lock, flags); 747 list_move_tail(imxdmac->ld_free.next, &imxdmac->ld_queue); 748 cookie = dma_cookie_assign(tx); 749 spin_unlock_irqrestore(&imxdma->lock, flags); 750 751 return cookie; 752 } 753 754 static int imxdma_alloc_chan_resources(struct dma_chan *chan) 755 { 756 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 757 struct imx_dma_data *data = chan->private; 758 759 if (data != NULL) 760 imxdmac->dma_request = data->dma_request; 761 762 while (imxdmac->descs_allocated < IMXDMA_MAX_CHAN_DESCRIPTORS) { 763 struct imxdma_desc *desc; 764 765 desc = kzalloc(sizeof(*desc), GFP_KERNEL); 766 if (!desc) 767 break; 768 __memzero(&desc->desc, sizeof(struct dma_async_tx_descriptor)); 769 dma_async_tx_descriptor_init(&desc->desc, chan); 770 desc->desc.tx_submit = imxdma_tx_submit; 771 /* txd.flags will be overwritten in prep funcs */ 772 desc->desc.flags = DMA_CTRL_ACK; 773 desc->status = DMA_COMPLETE; 774 775 list_add_tail(&desc->node, &imxdmac->ld_free); 776 imxdmac->descs_allocated++; 777 } 778 779 if (!imxdmac->descs_allocated) 780 return -ENOMEM; 781 782 return imxdmac->descs_allocated; 783 } 784 785 static void imxdma_free_chan_resources(struct dma_chan *chan) 786 { 787 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 788 struct imxdma_engine *imxdma = imxdmac->imxdma; 789 struct imxdma_desc *desc, *_desc; 790 unsigned long flags; 791 792 spin_lock_irqsave(&imxdma->lock, flags); 793 794 imxdma_disable_hw(imxdmac); 795 list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free); 796 list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free); 797 798 spin_unlock_irqrestore(&imxdma->lock, flags); 799 800 list_for_each_entry_safe(desc, _desc, &imxdmac->ld_free, node) { 801 kfree(desc); 802 imxdmac->descs_allocated--; 803 } 804 INIT_LIST_HEAD(&imxdmac->ld_free); 805 806 kfree(imxdmac->sg_list); 807 imxdmac->sg_list = NULL; 808 } 809 810 static struct dma_async_tx_descriptor *imxdma_prep_slave_sg( 811 struct dma_chan *chan, struct scatterlist *sgl, 812 unsigned int sg_len, enum dma_transfer_direction direction, 813 unsigned long flags, void *context) 814 { 815 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 816 struct scatterlist *sg; 817 int i, dma_length = 0; 818 struct imxdma_desc *desc; 819 820 if (list_empty(&imxdmac->ld_free) || 821 imxdma_chan_is_doing_cyclic(imxdmac)) 822 return NULL; 823 824 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); 825 826 for_each_sg(sgl, sg, sg_len, i) { 827 dma_length += sg_dma_len(sg); 828 } 829 830 switch (imxdmac->word_size) { 831 case DMA_SLAVE_BUSWIDTH_4_BYTES: 832 if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3) 833 return NULL; 834 break; 835 case DMA_SLAVE_BUSWIDTH_2_BYTES: 836 if (sg_dma_len(sgl) & 1 || sgl->dma_address & 1) 837 return NULL; 838 break; 839 case DMA_SLAVE_BUSWIDTH_1_BYTE: 840 break; 841 default: 842 return NULL; 843 } 844 845 desc->type = IMXDMA_DESC_SLAVE_SG; 846 desc->sg = sgl; 847 desc->sgcount = sg_len; 848 desc->len = dma_length; 849 desc->direction = direction; 850 if (direction == DMA_DEV_TO_MEM) { 851 desc->src = imxdmac->per_address; 852 } else { 853 desc->dest = imxdmac->per_address; 854 } 855 desc->desc.callback = NULL; 856 desc->desc.callback_param = NULL; 857 858 return &desc->desc; 859 } 860 861 static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic( 862 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, 863 size_t period_len, enum dma_transfer_direction direction, 864 unsigned long flags) 865 { 866 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 867 struct imxdma_engine *imxdma = imxdmac->imxdma; 868 struct imxdma_desc *desc; 869 int i; 870 unsigned int periods = buf_len / period_len; 871 872 dev_dbg(imxdma->dev, "%s channel: %d buf_len=%zu period_len=%zu\n", 873 __func__, imxdmac->channel, buf_len, period_len); 874 875 if (list_empty(&imxdmac->ld_free) || 876 imxdma_chan_is_doing_cyclic(imxdmac)) 877 return NULL; 878 879 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); 880 881 kfree(imxdmac->sg_list); 882 883 imxdmac->sg_list = kcalloc(periods + 1, 884 sizeof(struct scatterlist), GFP_ATOMIC); 885 if (!imxdmac->sg_list) 886 return NULL; 887 888 sg_init_table(imxdmac->sg_list, periods); 889 890 for (i = 0; i < periods; i++) { 891 sg_assign_page(&imxdmac->sg_list[i], NULL); 892 imxdmac->sg_list[i].offset = 0; 893 imxdmac->sg_list[i].dma_address = dma_addr; 894 sg_dma_len(&imxdmac->sg_list[i]) = period_len; 895 dma_addr += period_len; 896 } 897 898 /* close the loop */ 899 sg_chain(imxdmac->sg_list, periods + 1, imxdmac->sg_list); 900 901 desc->type = IMXDMA_DESC_CYCLIC; 902 desc->sg = imxdmac->sg_list; 903 desc->sgcount = periods; 904 desc->len = IMX_DMA_LENGTH_LOOP; 905 desc->direction = direction; 906 if (direction == DMA_DEV_TO_MEM) { 907 desc->src = imxdmac->per_address; 908 } else { 909 desc->dest = imxdmac->per_address; 910 } 911 desc->desc.callback = NULL; 912 desc->desc.callback_param = NULL; 913 914 return &desc->desc; 915 } 916 917 static struct dma_async_tx_descriptor *imxdma_prep_dma_memcpy( 918 struct dma_chan *chan, dma_addr_t dest, 919 dma_addr_t src, size_t len, unsigned long flags) 920 { 921 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 922 struct imxdma_engine *imxdma = imxdmac->imxdma; 923 struct imxdma_desc *desc; 924 925 dev_dbg(imxdma->dev, "%s channel: %d src=0x%llx dst=0x%llx len=%zu\n", 926 __func__, imxdmac->channel, (unsigned long long)src, 927 (unsigned long long)dest, len); 928 929 if (list_empty(&imxdmac->ld_free) || 930 imxdma_chan_is_doing_cyclic(imxdmac)) 931 return NULL; 932 933 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); 934 935 desc->type = IMXDMA_DESC_MEMCPY; 936 desc->src = src; 937 desc->dest = dest; 938 desc->len = len; 939 desc->direction = DMA_MEM_TO_MEM; 940 desc->config_port = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR; 941 desc->config_mem = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR; 942 desc->desc.callback = NULL; 943 desc->desc.callback_param = NULL; 944 945 return &desc->desc; 946 } 947 948 static struct dma_async_tx_descriptor *imxdma_prep_dma_interleaved( 949 struct dma_chan *chan, struct dma_interleaved_template *xt, 950 unsigned long flags) 951 { 952 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 953 struct imxdma_engine *imxdma = imxdmac->imxdma; 954 struct imxdma_desc *desc; 955 956 dev_dbg(imxdma->dev, "%s channel: %d src_start=0x%llx dst_start=0x%llx\n" 957 " src_sgl=%s dst_sgl=%s numf=%zu frame_size=%zu\n", __func__, 958 imxdmac->channel, (unsigned long long)xt->src_start, 959 (unsigned long long) xt->dst_start, 960 xt->src_sgl ? "true" : "false", xt->dst_sgl ? "true" : "false", 961 xt->numf, xt->frame_size); 962 963 if (list_empty(&imxdmac->ld_free) || 964 imxdma_chan_is_doing_cyclic(imxdmac)) 965 return NULL; 966 967 if (xt->frame_size != 1 || xt->numf <= 0 || xt->dir != DMA_MEM_TO_MEM) 968 return NULL; 969 970 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); 971 972 desc->type = IMXDMA_DESC_INTERLEAVED; 973 desc->src = xt->src_start; 974 desc->dest = xt->dst_start; 975 desc->x = xt->sgl[0].size; 976 desc->y = xt->numf; 977 desc->w = xt->sgl[0].icg + desc->x; 978 desc->len = desc->x * desc->y; 979 desc->direction = DMA_MEM_TO_MEM; 980 desc->config_port = IMX_DMA_MEMSIZE_32; 981 desc->config_mem = IMX_DMA_MEMSIZE_32; 982 if (xt->src_sgl) 983 desc->config_mem |= IMX_DMA_TYPE_2D; 984 if (xt->dst_sgl) 985 desc->config_port |= IMX_DMA_TYPE_2D; 986 desc->desc.callback = NULL; 987 desc->desc.callback_param = NULL; 988 989 return &desc->desc; 990 } 991 992 static void imxdma_issue_pending(struct dma_chan *chan) 993 { 994 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 995 struct imxdma_engine *imxdma = imxdmac->imxdma; 996 struct imxdma_desc *desc; 997 unsigned long flags; 998 999 spin_lock_irqsave(&imxdma->lock, flags); 1000 if (list_empty(&imxdmac->ld_active) && 1001 !list_empty(&imxdmac->ld_queue)) { 1002 desc = list_first_entry(&imxdmac->ld_queue, 1003 struct imxdma_desc, node); 1004 1005 if (imxdma_xfer_desc(desc) < 0) { 1006 dev_warn(imxdma->dev, 1007 "%s: channel: %d couldn't issue DMA xfer\n", 1008 __func__, imxdmac->channel); 1009 } else { 1010 list_move_tail(imxdmac->ld_queue.next, 1011 &imxdmac->ld_active); 1012 } 1013 } 1014 spin_unlock_irqrestore(&imxdma->lock, flags); 1015 } 1016 1017 static bool imxdma_filter_fn(struct dma_chan *chan, void *param) 1018 { 1019 struct imxdma_filter_data *fdata = param; 1020 struct imxdma_channel *imxdma_chan = to_imxdma_chan(chan); 1021 1022 if (chan->device->dev != fdata->imxdma->dev) 1023 return false; 1024 1025 imxdma_chan->dma_request = fdata->request; 1026 chan->private = NULL; 1027 1028 return true; 1029 } 1030 1031 static struct dma_chan *imxdma_xlate(struct of_phandle_args *dma_spec, 1032 struct of_dma *ofdma) 1033 { 1034 int count = dma_spec->args_count; 1035 struct imxdma_engine *imxdma = ofdma->of_dma_data; 1036 struct imxdma_filter_data fdata = { 1037 .imxdma = imxdma, 1038 }; 1039 1040 if (count != 1) 1041 return NULL; 1042 1043 fdata.request = dma_spec->args[0]; 1044 1045 return dma_request_channel(imxdma->dma_device.cap_mask, 1046 imxdma_filter_fn, &fdata); 1047 } 1048 1049 static int __init imxdma_probe(struct platform_device *pdev) 1050 { 1051 struct imxdma_engine *imxdma; 1052 struct resource *res; 1053 const struct of_device_id *of_id; 1054 int ret, i; 1055 int irq, irq_err; 1056 1057 of_id = of_match_device(imx_dma_of_dev_id, &pdev->dev); 1058 if (of_id) 1059 pdev->id_entry = of_id->data; 1060 1061 imxdma = devm_kzalloc(&pdev->dev, sizeof(*imxdma), GFP_KERNEL); 1062 if (!imxdma) 1063 return -ENOMEM; 1064 1065 imxdma->dev = &pdev->dev; 1066 imxdma->devtype = pdev->id_entry->driver_data; 1067 1068 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1069 imxdma->base = devm_ioremap_resource(&pdev->dev, res); 1070 if (IS_ERR(imxdma->base)) 1071 return PTR_ERR(imxdma->base); 1072 1073 irq = platform_get_irq(pdev, 0); 1074 if (irq < 0) 1075 return irq; 1076 1077 imxdma->dma_ipg = devm_clk_get(&pdev->dev, "ipg"); 1078 if (IS_ERR(imxdma->dma_ipg)) 1079 return PTR_ERR(imxdma->dma_ipg); 1080 1081 imxdma->dma_ahb = devm_clk_get(&pdev->dev, "ahb"); 1082 if (IS_ERR(imxdma->dma_ahb)) 1083 return PTR_ERR(imxdma->dma_ahb); 1084 1085 ret = clk_prepare_enable(imxdma->dma_ipg); 1086 if (ret) 1087 return ret; 1088 ret = clk_prepare_enable(imxdma->dma_ahb); 1089 if (ret) 1090 goto disable_dma_ipg_clk; 1091 1092 /* reset DMA module */ 1093 imx_dmav1_writel(imxdma, DCR_DRST, DMA_DCR); 1094 1095 if (is_imx1_dma(imxdma)) { 1096 ret = devm_request_irq(&pdev->dev, irq, 1097 dma_irq_handler, 0, "DMA", imxdma); 1098 if (ret) { 1099 dev_warn(imxdma->dev, "Can't register IRQ for DMA\n"); 1100 goto disable_dma_ahb_clk; 1101 } 1102 imxdma->irq = irq; 1103 1104 irq_err = platform_get_irq(pdev, 1); 1105 if (irq_err < 0) { 1106 ret = irq_err; 1107 goto disable_dma_ahb_clk; 1108 } 1109 1110 ret = devm_request_irq(&pdev->dev, irq_err, 1111 imxdma_err_handler, 0, "DMA", imxdma); 1112 if (ret) { 1113 dev_warn(imxdma->dev, "Can't register ERRIRQ for DMA\n"); 1114 goto disable_dma_ahb_clk; 1115 } 1116 imxdma->irq_err = irq_err; 1117 } 1118 1119 /* enable DMA module */ 1120 imx_dmav1_writel(imxdma, DCR_DEN, DMA_DCR); 1121 1122 /* clear all interrupts */ 1123 imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DISR); 1124 1125 /* disable interrupts */ 1126 imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR); 1127 1128 INIT_LIST_HEAD(&imxdma->dma_device.channels); 1129 1130 dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask); 1131 dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask); 1132 dma_cap_set(DMA_MEMCPY, imxdma->dma_device.cap_mask); 1133 dma_cap_set(DMA_INTERLEAVE, imxdma->dma_device.cap_mask); 1134 1135 /* Initialize 2D global parameters */ 1136 for (i = 0; i < IMX_DMA_2D_SLOTS; i++) 1137 imxdma->slots_2d[i].count = 0; 1138 1139 spin_lock_init(&imxdma->lock); 1140 1141 /* Initialize channel parameters */ 1142 for (i = 0; i < IMX_DMA_CHANNELS; i++) { 1143 struct imxdma_channel *imxdmac = &imxdma->channel[i]; 1144 1145 if (!is_imx1_dma(imxdma)) { 1146 ret = devm_request_irq(&pdev->dev, irq + i, 1147 dma_irq_handler, 0, "DMA", imxdma); 1148 if (ret) { 1149 dev_warn(imxdma->dev, "Can't register IRQ %d " 1150 "for DMA channel %d\n", 1151 irq + i, i); 1152 goto disable_dma_ahb_clk; 1153 } 1154 1155 imxdmac->irq = irq + i; 1156 timer_setup(&imxdmac->watchdog, imxdma_watchdog, 0); 1157 } 1158 1159 imxdmac->imxdma = imxdma; 1160 1161 INIT_LIST_HEAD(&imxdmac->ld_queue); 1162 INIT_LIST_HEAD(&imxdmac->ld_free); 1163 INIT_LIST_HEAD(&imxdmac->ld_active); 1164 1165 tasklet_init(&imxdmac->dma_tasklet, imxdma_tasklet, 1166 (unsigned long)imxdmac); 1167 imxdmac->chan.device = &imxdma->dma_device; 1168 dma_cookie_init(&imxdmac->chan); 1169 imxdmac->channel = i; 1170 1171 /* Add the channel to the DMAC list */ 1172 list_add_tail(&imxdmac->chan.device_node, 1173 &imxdma->dma_device.channels); 1174 } 1175 1176 imxdma->dma_device.dev = &pdev->dev; 1177 1178 imxdma->dma_device.device_alloc_chan_resources = imxdma_alloc_chan_resources; 1179 imxdma->dma_device.device_free_chan_resources = imxdma_free_chan_resources; 1180 imxdma->dma_device.device_tx_status = imxdma_tx_status; 1181 imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg; 1182 imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic; 1183 imxdma->dma_device.device_prep_dma_memcpy = imxdma_prep_dma_memcpy; 1184 imxdma->dma_device.device_prep_interleaved_dma = imxdma_prep_dma_interleaved; 1185 imxdma->dma_device.device_config = imxdma_config; 1186 imxdma->dma_device.device_terminate_all = imxdma_terminate_all; 1187 imxdma->dma_device.device_issue_pending = imxdma_issue_pending; 1188 1189 platform_set_drvdata(pdev, imxdma); 1190 1191 imxdma->dma_device.copy_align = DMAENGINE_ALIGN_4_BYTES; 1192 imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms; 1193 dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff); 1194 1195 ret = dma_async_device_register(&imxdma->dma_device); 1196 if (ret) { 1197 dev_err(&pdev->dev, "unable to register\n"); 1198 goto disable_dma_ahb_clk; 1199 } 1200 1201 if (pdev->dev.of_node) { 1202 ret = of_dma_controller_register(pdev->dev.of_node, 1203 imxdma_xlate, imxdma); 1204 if (ret) { 1205 dev_err(&pdev->dev, "unable to register of_dma_controller\n"); 1206 goto err_of_dma_controller; 1207 } 1208 } 1209 1210 return 0; 1211 1212 err_of_dma_controller: 1213 dma_async_device_unregister(&imxdma->dma_device); 1214 disable_dma_ahb_clk: 1215 clk_disable_unprepare(imxdma->dma_ahb); 1216 disable_dma_ipg_clk: 1217 clk_disable_unprepare(imxdma->dma_ipg); 1218 return ret; 1219 } 1220 1221 static void imxdma_free_irq(struct platform_device *pdev, struct imxdma_engine *imxdma) 1222 { 1223 int i; 1224 1225 if (is_imx1_dma(imxdma)) { 1226 disable_irq(imxdma->irq); 1227 disable_irq(imxdma->irq_err); 1228 } 1229 1230 for (i = 0; i < IMX_DMA_CHANNELS; i++) { 1231 struct imxdma_channel *imxdmac = &imxdma->channel[i]; 1232 1233 if (!is_imx1_dma(imxdma)) 1234 disable_irq(imxdmac->irq); 1235 1236 tasklet_kill(&imxdmac->dma_tasklet); 1237 } 1238 } 1239 1240 static int imxdma_remove(struct platform_device *pdev) 1241 { 1242 struct imxdma_engine *imxdma = platform_get_drvdata(pdev); 1243 1244 imxdma_free_irq(pdev, imxdma); 1245 1246 dma_async_device_unregister(&imxdma->dma_device); 1247 1248 if (pdev->dev.of_node) 1249 of_dma_controller_free(pdev->dev.of_node); 1250 1251 clk_disable_unprepare(imxdma->dma_ipg); 1252 clk_disable_unprepare(imxdma->dma_ahb); 1253 1254 return 0; 1255 } 1256 1257 static struct platform_driver imxdma_driver = { 1258 .driver = { 1259 .name = "imx-dma", 1260 .of_match_table = imx_dma_of_dev_id, 1261 }, 1262 .id_table = imx_dma_devtype, 1263 .remove = imxdma_remove, 1264 }; 1265 1266 static int __init imxdma_module_init(void) 1267 { 1268 return platform_driver_probe(&imxdma_driver, imxdma_probe); 1269 } 1270 subsys_initcall(imxdma_module_init); 1271 1272 MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>"); 1273 MODULE_DESCRIPTION("i.MX dma driver"); 1274 MODULE_LICENSE("GPL"); 1275