1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // drivers/dma/imx-dma.c 4 // 5 // This file contains a driver for the Freescale i.MX DMA engine 6 // found on i.MX1/21/27 7 // 8 // Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> 9 // Copyright 2012 Javier Martin, Vista Silicon <javier.martin@vista-silicon.com> 10 11 #include <linux/err.h> 12 #include <linux/init.h> 13 #include <linux/types.h> 14 #include <linux/mm.h> 15 #include <linux/interrupt.h> 16 #include <linux/spinlock.h> 17 #include <linux/device.h> 18 #include <linux/dma-mapping.h> 19 #include <linux/slab.h> 20 #include <linux/platform_device.h> 21 #include <linux/clk.h> 22 #include <linux/dmaengine.h> 23 #include <linux/module.h> 24 #include <linux/of_device.h> 25 #include <linux/of_dma.h> 26 27 #include <asm/irq.h> 28 #include <linux/platform_data/dma-imx.h> 29 30 #include "dmaengine.h" 31 #define IMXDMA_MAX_CHAN_DESCRIPTORS 16 32 #define IMX_DMA_CHANNELS 16 33 34 #define IMX_DMA_2D_SLOTS 2 35 #define IMX_DMA_2D_SLOT_A 0 36 #define IMX_DMA_2D_SLOT_B 1 37 38 #define IMX_DMA_LENGTH_LOOP ((unsigned int)-1) 39 #define IMX_DMA_MEMSIZE_32 (0 << 4) 40 #define IMX_DMA_MEMSIZE_8 (1 << 4) 41 #define IMX_DMA_MEMSIZE_16 (2 << 4) 42 #define IMX_DMA_TYPE_LINEAR (0 << 10) 43 #define IMX_DMA_TYPE_2D (1 << 10) 44 #define IMX_DMA_TYPE_FIFO (2 << 10) 45 46 #define IMX_DMA_ERR_BURST (1 << 0) 47 #define IMX_DMA_ERR_REQUEST (1 << 1) 48 #define IMX_DMA_ERR_TRANSFER (1 << 2) 49 #define IMX_DMA_ERR_BUFFER (1 << 3) 50 #define IMX_DMA_ERR_TIMEOUT (1 << 4) 51 52 #define DMA_DCR 0x00 /* Control Register */ 53 #define DMA_DISR 0x04 /* Interrupt status Register */ 54 #define DMA_DIMR 0x08 /* Interrupt mask Register */ 55 #define DMA_DBTOSR 0x0c /* Burst timeout status Register */ 56 #define DMA_DRTOSR 0x10 /* Request timeout Register */ 57 #define DMA_DSESR 0x14 /* Transfer Error Status Register */ 58 #define DMA_DBOSR 0x18 /* Buffer overflow status Register */ 59 #define DMA_DBTOCR 0x1c /* Burst timeout control Register */ 60 #define DMA_WSRA 0x40 /* W-Size Register A */ 61 #define DMA_XSRA 0x44 /* X-Size Register A */ 62 #define DMA_YSRA 0x48 /* Y-Size Register A */ 63 #define DMA_WSRB 0x4c /* W-Size Register B */ 64 #define DMA_XSRB 0x50 /* X-Size Register B */ 65 #define DMA_YSRB 0x54 /* Y-Size Register B */ 66 #define DMA_SAR(x) (0x80 + ((x) << 6)) /* Source Address Registers */ 67 #define DMA_DAR(x) (0x84 + ((x) << 6)) /* Destination Address Registers */ 68 #define DMA_CNTR(x) (0x88 + ((x) << 6)) /* Count Registers */ 69 #define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control Registers */ 70 #define DMA_RSSR(x) (0x90 + ((x) << 6)) /* Request source select Registers */ 71 #define DMA_BLR(x) (0x94 + ((x) << 6)) /* Burst length Registers */ 72 #define DMA_RTOR(x) (0x98 + ((x) << 6)) /* Request timeout Registers */ 73 #define DMA_BUCR(x) (0x98 + ((x) << 6)) /* Bus Utilization Registers */ 74 #define DMA_CCNR(x) (0x9C + ((x) << 6)) /* Channel counter Registers */ 75 76 #define DCR_DRST (1<<1) 77 #define DCR_DEN (1<<0) 78 #define DBTOCR_EN (1<<15) 79 #define DBTOCR_CNT(x) ((x) & 0x7fff) 80 #define CNTR_CNT(x) ((x) & 0xffffff) 81 #define CCR_ACRPT (1<<14) 82 #define CCR_DMOD_LINEAR (0x0 << 12) 83 #define CCR_DMOD_2D (0x1 << 12) 84 #define CCR_DMOD_FIFO (0x2 << 12) 85 #define CCR_DMOD_EOBFIFO (0x3 << 12) 86 #define CCR_SMOD_LINEAR (0x0 << 10) 87 #define CCR_SMOD_2D (0x1 << 10) 88 #define CCR_SMOD_FIFO (0x2 << 10) 89 #define CCR_SMOD_EOBFIFO (0x3 << 10) 90 #define CCR_MDIR_DEC (1<<9) 91 #define CCR_MSEL_B (1<<8) 92 #define CCR_DSIZ_32 (0x0 << 6) 93 #define CCR_DSIZ_8 (0x1 << 6) 94 #define CCR_DSIZ_16 (0x2 << 6) 95 #define CCR_SSIZ_32 (0x0 << 4) 96 #define CCR_SSIZ_8 (0x1 << 4) 97 #define CCR_SSIZ_16 (0x2 << 4) 98 #define CCR_REN (1<<3) 99 #define CCR_RPT (1<<2) 100 #define CCR_FRC (1<<1) 101 #define CCR_CEN (1<<0) 102 #define RTOR_EN (1<<15) 103 #define RTOR_CLK (1<<14) 104 #define RTOR_PSC (1<<13) 105 106 enum imxdma_prep_type { 107 IMXDMA_DESC_MEMCPY, 108 IMXDMA_DESC_INTERLEAVED, 109 IMXDMA_DESC_SLAVE_SG, 110 IMXDMA_DESC_CYCLIC, 111 }; 112 113 struct imx_dma_2d_config { 114 u16 xsr; 115 u16 ysr; 116 u16 wsr; 117 int count; 118 }; 119 120 struct imxdma_desc { 121 struct list_head node; 122 struct dma_async_tx_descriptor desc; 123 enum dma_status status; 124 dma_addr_t src; 125 dma_addr_t dest; 126 size_t len; 127 enum dma_transfer_direction direction; 128 enum imxdma_prep_type type; 129 /* For memcpy and interleaved */ 130 unsigned int config_port; 131 unsigned int config_mem; 132 /* For interleaved transfers */ 133 unsigned int x; 134 unsigned int y; 135 unsigned int w; 136 /* For slave sg and cyclic */ 137 struct scatterlist *sg; 138 unsigned int sgcount; 139 }; 140 141 struct imxdma_channel { 142 int hw_chaining; 143 struct timer_list watchdog; 144 struct imxdma_engine *imxdma; 145 unsigned int channel; 146 147 struct tasklet_struct dma_tasklet; 148 struct list_head ld_free; 149 struct list_head ld_queue; 150 struct list_head ld_active; 151 int descs_allocated; 152 enum dma_slave_buswidth word_size; 153 dma_addr_t per_address; 154 u32 watermark_level; 155 struct dma_chan chan; 156 struct dma_async_tx_descriptor desc; 157 enum dma_status status; 158 int dma_request; 159 struct scatterlist *sg_list; 160 u32 ccr_from_device; 161 u32 ccr_to_device; 162 bool enabled_2d; 163 int slot_2d; 164 unsigned int irq; 165 struct dma_slave_config config; 166 }; 167 168 enum imx_dma_type { 169 IMX1_DMA, 170 IMX21_DMA, 171 IMX27_DMA, 172 }; 173 174 struct imxdma_engine { 175 struct device *dev; 176 struct dma_device dma_device; 177 void __iomem *base; 178 struct clk *dma_ahb; 179 struct clk *dma_ipg; 180 spinlock_t lock; 181 struct imx_dma_2d_config slots_2d[IMX_DMA_2D_SLOTS]; 182 struct imxdma_channel channel[IMX_DMA_CHANNELS]; 183 enum imx_dma_type devtype; 184 unsigned int irq; 185 unsigned int irq_err; 186 187 }; 188 189 struct imxdma_filter_data { 190 struct imxdma_engine *imxdma; 191 int request; 192 }; 193 194 static const struct platform_device_id imx_dma_devtype[] = { 195 { 196 .name = "imx1-dma", 197 .driver_data = IMX1_DMA, 198 }, { 199 .name = "imx21-dma", 200 .driver_data = IMX21_DMA, 201 }, { 202 .name = "imx27-dma", 203 .driver_data = IMX27_DMA, 204 }, { 205 /* sentinel */ 206 } 207 }; 208 MODULE_DEVICE_TABLE(platform, imx_dma_devtype); 209 210 static const struct of_device_id imx_dma_of_dev_id[] = { 211 { 212 .compatible = "fsl,imx1-dma", 213 .data = &imx_dma_devtype[IMX1_DMA], 214 }, { 215 .compatible = "fsl,imx21-dma", 216 .data = &imx_dma_devtype[IMX21_DMA], 217 }, { 218 .compatible = "fsl,imx27-dma", 219 .data = &imx_dma_devtype[IMX27_DMA], 220 }, { 221 /* sentinel */ 222 } 223 }; 224 MODULE_DEVICE_TABLE(of, imx_dma_of_dev_id); 225 226 static inline int is_imx1_dma(struct imxdma_engine *imxdma) 227 { 228 return imxdma->devtype == IMX1_DMA; 229 } 230 231 static inline int is_imx27_dma(struct imxdma_engine *imxdma) 232 { 233 return imxdma->devtype == IMX27_DMA; 234 } 235 236 static struct imxdma_channel *to_imxdma_chan(struct dma_chan *chan) 237 { 238 return container_of(chan, struct imxdma_channel, chan); 239 } 240 241 static inline bool imxdma_chan_is_doing_cyclic(struct imxdma_channel *imxdmac) 242 { 243 struct imxdma_desc *desc; 244 245 if (!list_empty(&imxdmac->ld_active)) { 246 desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, 247 node); 248 if (desc->type == IMXDMA_DESC_CYCLIC) 249 return true; 250 } 251 return false; 252 } 253 254 255 256 static void imx_dmav1_writel(struct imxdma_engine *imxdma, unsigned val, 257 unsigned offset) 258 { 259 __raw_writel(val, imxdma->base + offset); 260 } 261 262 static unsigned imx_dmav1_readl(struct imxdma_engine *imxdma, unsigned offset) 263 { 264 return __raw_readl(imxdma->base + offset); 265 } 266 267 static int imxdma_hw_chain(struct imxdma_channel *imxdmac) 268 { 269 struct imxdma_engine *imxdma = imxdmac->imxdma; 270 271 if (is_imx27_dma(imxdma)) 272 return imxdmac->hw_chaining; 273 else 274 return 0; 275 } 276 277 /* 278 * imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation 279 */ 280 static inline void imxdma_sg_next(struct imxdma_desc *d) 281 { 282 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan); 283 struct imxdma_engine *imxdma = imxdmac->imxdma; 284 struct scatterlist *sg = d->sg; 285 size_t now; 286 287 now = min_t(size_t, d->len, sg_dma_len(sg)); 288 if (d->len != IMX_DMA_LENGTH_LOOP) 289 d->len -= now; 290 291 if (d->direction == DMA_DEV_TO_MEM) 292 imx_dmav1_writel(imxdma, sg->dma_address, 293 DMA_DAR(imxdmac->channel)); 294 else 295 imx_dmav1_writel(imxdma, sg->dma_address, 296 DMA_SAR(imxdmac->channel)); 297 298 imx_dmav1_writel(imxdma, now, DMA_CNTR(imxdmac->channel)); 299 300 dev_dbg(imxdma->dev, " %s channel: %d dst 0x%08x, src 0x%08x, " 301 "size 0x%08x\n", __func__, imxdmac->channel, 302 imx_dmav1_readl(imxdma, DMA_DAR(imxdmac->channel)), 303 imx_dmav1_readl(imxdma, DMA_SAR(imxdmac->channel)), 304 imx_dmav1_readl(imxdma, DMA_CNTR(imxdmac->channel))); 305 } 306 307 static void imxdma_enable_hw(struct imxdma_desc *d) 308 { 309 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan); 310 struct imxdma_engine *imxdma = imxdmac->imxdma; 311 int channel = imxdmac->channel; 312 unsigned long flags; 313 314 dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel); 315 316 local_irq_save(flags); 317 318 imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR); 319 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) & 320 ~(1 << channel), DMA_DIMR); 321 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) | 322 CCR_CEN | CCR_ACRPT, DMA_CCR(channel)); 323 324 if (!is_imx1_dma(imxdma) && 325 d->sg && imxdma_hw_chain(imxdmac)) { 326 d->sg = sg_next(d->sg); 327 if (d->sg) { 328 u32 tmp; 329 imxdma_sg_next(d); 330 tmp = imx_dmav1_readl(imxdma, DMA_CCR(channel)); 331 imx_dmav1_writel(imxdma, tmp | CCR_RPT | CCR_ACRPT, 332 DMA_CCR(channel)); 333 } 334 } 335 336 local_irq_restore(flags); 337 } 338 339 static void imxdma_disable_hw(struct imxdma_channel *imxdmac) 340 { 341 struct imxdma_engine *imxdma = imxdmac->imxdma; 342 int channel = imxdmac->channel; 343 unsigned long flags; 344 345 dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel); 346 347 if (imxdma_hw_chain(imxdmac)) 348 del_timer(&imxdmac->watchdog); 349 350 local_irq_save(flags); 351 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) | 352 (1 << channel), DMA_DIMR); 353 imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) & 354 ~CCR_CEN, DMA_CCR(channel)); 355 imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR); 356 local_irq_restore(flags); 357 } 358 359 static void imxdma_watchdog(struct timer_list *t) 360 { 361 struct imxdma_channel *imxdmac = from_timer(imxdmac, t, watchdog); 362 struct imxdma_engine *imxdma = imxdmac->imxdma; 363 int channel = imxdmac->channel; 364 365 imx_dmav1_writel(imxdma, 0, DMA_CCR(channel)); 366 367 /* Tasklet watchdog error handler */ 368 tasklet_schedule(&imxdmac->dma_tasklet); 369 dev_dbg(imxdma->dev, "channel %d: watchdog timeout!\n", 370 imxdmac->channel); 371 } 372 373 static irqreturn_t imxdma_err_handler(int irq, void *dev_id) 374 { 375 struct imxdma_engine *imxdma = dev_id; 376 unsigned int err_mask; 377 int i, disr; 378 int errcode; 379 380 disr = imx_dmav1_readl(imxdma, DMA_DISR); 381 382 err_mask = imx_dmav1_readl(imxdma, DMA_DBTOSR) | 383 imx_dmav1_readl(imxdma, DMA_DRTOSR) | 384 imx_dmav1_readl(imxdma, DMA_DSESR) | 385 imx_dmav1_readl(imxdma, DMA_DBOSR); 386 387 if (!err_mask) 388 return IRQ_HANDLED; 389 390 imx_dmav1_writel(imxdma, disr & err_mask, DMA_DISR); 391 392 for (i = 0; i < IMX_DMA_CHANNELS; i++) { 393 if (!(err_mask & (1 << i))) 394 continue; 395 errcode = 0; 396 397 if (imx_dmav1_readl(imxdma, DMA_DBTOSR) & (1 << i)) { 398 imx_dmav1_writel(imxdma, 1 << i, DMA_DBTOSR); 399 errcode |= IMX_DMA_ERR_BURST; 400 } 401 if (imx_dmav1_readl(imxdma, DMA_DRTOSR) & (1 << i)) { 402 imx_dmav1_writel(imxdma, 1 << i, DMA_DRTOSR); 403 errcode |= IMX_DMA_ERR_REQUEST; 404 } 405 if (imx_dmav1_readl(imxdma, DMA_DSESR) & (1 << i)) { 406 imx_dmav1_writel(imxdma, 1 << i, DMA_DSESR); 407 errcode |= IMX_DMA_ERR_TRANSFER; 408 } 409 if (imx_dmav1_readl(imxdma, DMA_DBOSR) & (1 << i)) { 410 imx_dmav1_writel(imxdma, 1 << i, DMA_DBOSR); 411 errcode |= IMX_DMA_ERR_BUFFER; 412 } 413 /* Tasklet error handler */ 414 tasklet_schedule(&imxdma->channel[i].dma_tasklet); 415 416 dev_warn(imxdma->dev, 417 "DMA timeout on channel %d -%s%s%s%s\n", i, 418 errcode & IMX_DMA_ERR_BURST ? " burst" : "", 419 errcode & IMX_DMA_ERR_REQUEST ? " request" : "", 420 errcode & IMX_DMA_ERR_TRANSFER ? " transfer" : "", 421 errcode & IMX_DMA_ERR_BUFFER ? " buffer" : ""); 422 } 423 return IRQ_HANDLED; 424 } 425 426 static void dma_irq_handle_channel(struct imxdma_channel *imxdmac) 427 { 428 struct imxdma_engine *imxdma = imxdmac->imxdma; 429 int chno = imxdmac->channel; 430 struct imxdma_desc *desc; 431 unsigned long flags; 432 433 spin_lock_irqsave(&imxdma->lock, flags); 434 if (list_empty(&imxdmac->ld_active)) { 435 spin_unlock_irqrestore(&imxdma->lock, flags); 436 goto out; 437 } 438 439 desc = list_first_entry(&imxdmac->ld_active, 440 struct imxdma_desc, 441 node); 442 spin_unlock_irqrestore(&imxdma->lock, flags); 443 444 if (desc->sg) { 445 u32 tmp; 446 desc->sg = sg_next(desc->sg); 447 448 if (desc->sg) { 449 imxdma_sg_next(desc); 450 451 tmp = imx_dmav1_readl(imxdma, DMA_CCR(chno)); 452 453 if (imxdma_hw_chain(imxdmac)) { 454 /* FIXME: The timeout should probably be 455 * configurable 456 */ 457 mod_timer(&imxdmac->watchdog, 458 jiffies + msecs_to_jiffies(500)); 459 460 tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT; 461 imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno)); 462 } else { 463 imx_dmav1_writel(imxdma, tmp & ~CCR_CEN, 464 DMA_CCR(chno)); 465 tmp |= CCR_CEN; 466 } 467 468 imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno)); 469 470 if (imxdma_chan_is_doing_cyclic(imxdmac)) 471 /* Tasklet progression */ 472 tasklet_schedule(&imxdmac->dma_tasklet); 473 474 return; 475 } 476 477 if (imxdma_hw_chain(imxdmac)) { 478 del_timer(&imxdmac->watchdog); 479 return; 480 } 481 } 482 483 out: 484 imx_dmav1_writel(imxdma, 0, DMA_CCR(chno)); 485 /* Tasklet irq */ 486 tasklet_schedule(&imxdmac->dma_tasklet); 487 } 488 489 static irqreturn_t dma_irq_handler(int irq, void *dev_id) 490 { 491 struct imxdma_engine *imxdma = dev_id; 492 int i, disr; 493 494 if (!is_imx1_dma(imxdma)) 495 imxdma_err_handler(irq, dev_id); 496 497 disr = imx_dmav1_readl(imxdma, DMA_DISR); 498 499 dev_dbg(imxdma->dev, "%s called, disr=0x%08x\n", __func__, disr); 500 501 imx_dmav1_writel(imxdma, disr, DMA_DISR); 502 for (i = 0; i < IMX_DMA_CHANNELS; i++) { 503 if (disr & (1 << i)) 504 dma_irq_handle_channel(&imxdma->channel[i]); 505 } 506 507 return IRQ_HANDLED; 508 } 509 510 static int imxdma_xfer_desc(struct imxdma_desc *d) 511 { 512 struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan); 513 struct imxdma_engine *imxdma = imxdmac->imxdma; 514 int slot = -1; 515 int i; 516 517 /* Configure and enable */ 518 switch (d->type) { 519 case IMXDMA_DESC_INTERLEAVED: 520 /* Try to get a free 2D slot */ 521 for (i = 0; i < IMX_DMA_2D_SLOTS; i++) { 522 if ((imxdma->slots_2d[i].count > 0) && 523 ((imxdma->slots_2d[i].xsr != d->x) || 524 (imxdma->slots_2d[i].ysr != d->y) || 525 (imxdma->slots_2d[i].wsr != d->w))) 526 continue; 527 slot = i; 528 break; 529 } 530 if (slot < 0) 531 return -EBUSY; 532 533 imxdma->slots_2d[slot].xsr = d->x; 534 imxdma->slots_2d[slot].ysr = d->y; 535 imxdma->slots_2d[slot].wsr = d->w; 536 imxdma->slots_2d[slot].count++; 537 538 imxdmac->slot_2d = slot; 539 imxdmac->enabled_2d = true; 540 541 if (slot == IMX_DMA_2D_SLOT_A) { 542 d->config_mem &= ~CCR_MSEL_B; 543 d->config_port &= ~CCR_MSEL_B; 544 imx_dmav1_writel(imxdma, d->x, DMA_XSRA); 545 imx_dmav1_writel(imxdma, d->y, DMA_YSRA); 546 imx_dmav1_writel(imxdma, d->w, DMA_WSRA); 547 } else { 548 d->config_mem |= CCR_MSEL_B; 549 d->config_port |= CCR_MSEL_B; 550 imx_dmav1_writel(imxdma, d->x, DMA_XSRB); 551 imx_dmav1_writel(imxdma, d->y, DMA_YSRB); 552 imx_dmav1_writel(imxdma, d->w, DMA_WSRB); 553 } 554 /* 555 * We fall-through here intentionally, since a 2D transfer is 556 * similar to MEMCPY just adding the 2D slot configuration. 557 */ 558 fallthrough; 559 case IMXDMA_DESC_MEMCPY: 560 imx_dmav1_writel(imxdma, d->src, DMA_SAR(imxdmac->channel)); 561 imx_dmav1_writel(imxdma, d->dest, DMA_DAR(imxdmac->channel)); 562 imx_dmav1_writel(imxdma, d->config_mem | (d->config_port << 2), 563 DMA_CCR(imxdmac->channel)); 564 565 imx_dmav1_writel(imxdma, d->len, DMA_CNTR(imxdmac->channel)); 566 567 dev_dbg(imxdma->dev, 568 "%s channel: %d dest=0x%08llx src=0x%08llx dma_length=%zu\n", 569 __func__, imxdmac->channel, 570 (unsigned long long)d->dest, 571 (unsigned long long)d->src, d->len); 572 573 break; 574 /* Cyclic transfer is the same as slave_sg with special sg configuration. */ 575 case IMXDMA_DESC_CYCLIC: 576 case IMXDMA_DESC_SLAVE_SG: 577 if (d->direction == DMA_DEV_TO_MEM) { 578 imx_dmav1_writel(imxdma, imxdmac->per_address, 579 DMA_SAR(imxdmac->channel)); 580 imx_dmav1_writel(imxdma, imxdmac->ccr_from_device, 581 DMA_CCR(imxdmac->channel)); 582 583 dev_dbg(imxdma->dev, 584 "%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (dev2mem)\n", 585 __func__, imxdmac->channel, 586 d->sg, d->sgcount, d->len, 587 (unsigned long long)imxdmac->per_address); 588 } else if (d->direction == DMA_MEM_TO_DEV) { 589 imx_dmav1_writel(imxdma, imxdmac->per_address, 590 DMA_DAR(imxdmac->channel)); 591 imx_dmav1_writel(imxdma, imxdmac->ccr_to_device, 592 DMA_CCR(imxdmac->channel)); 593 594 dev_dbg(imxdma->dev, 595 "%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (mem2dev)\n", 596 __func__, imxdmac->channel, 597 d->sg, d->sgcount, d->len, 598 (unsigned long long)imxdmac->per_address); 599 } else { 600 dev_err(imxdma->dev, "%s channel: %d bad dma mode\n", 601 __func__, imxdmac->channel); 602 return -EINVAL; 603 } 604 605 imxdma_sg_next(d); 606 607 break; 608 default: 609 return -EINVAL; 610 } 611 imxdma_enable_hw(d); 612 return 0; 613 } 614 615 static void imxdma_tasklet(struct tasklet_struct *t) 616 { 617 struct imxdma_channel *imxdmac = from_tasklet(imxdmac, t, dma_tasklet); 618 struct imxdma_engine *imxdma = imxdmac->imxdma; 619 struct imxdma_desc *desc, *next_desc; 620 unsigned long flags; 621 622 spin_lock_irqsave(&imxdma->lock, flags); 623 624 if (list_empty(&imxdmac->ld_active)) { 625 /* Someone might have called terminate all */ 626 spin_unlock_irqrestore(&imxdma->lock, flags); 627 return; 628 } 629 desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node); 630 631 /* If we are dealing with a cyclic descriptor, keep it on ld_active 632 * and dont mark the descriptor as complete. 633 * Only in non-cyclic cases it would be marked as complete 634 */ 635 if (imxdma_chan_is_doing_cyclic(imxdmac)) 636 goto out; 637 else 638 dma_cookie_complete(&desc->desc); 639 640 /* Free 2D slot if it was an interleaved transfer */ 641 if (imxdmac->enabled_2d) { 642 imxdma->slots_2d[imxdmac->slot_2d].count--; 643 imxdmac->enabled_2d = false; 644 } 645 646 list_move_tail(imxdmac->ld_active.next, &imxdmac->ld_free); 647 648 if (!list_empty(&imxdmac->ld_queue)) { 649 next_desc = list_first_entry(&imxdmac->ld_queue, 650 struct imxdma_desc, node); 651 list_move_tail(imxdmac->ld_queue.next, &imxdmac->ld_active); 652 if (imxdma_xfer_desc(next_desc) < 0) 653 dev_warn(imxdma->dev, "%s: channel: %d couldn't xfer desc\n", 654 __func__, imxdmac->channel); 655 } 656 out: 657 spin_unlock_irqrestore(&imxdma->lock, flags); 658 659 dmaengine_desc_get_callback_invoke(&desc->desc, NULL); 660 } 661 662 static int imxdma_terminate_all(struct dma_chan *chan) 663 { 664 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 665 struct imxdma_engine *imxdma = imxdmac->imxdma; 666 unsigned long flags; 667 668 imxdma_disable_hw(imxdmac); 669 670 spin_lock_irqsave(&imxdma->lock, flags); 671 list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free); 672 list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free); 673 spin_unlock_irqrestore(&imxdma->lock, flags); 674 return 0; 675 } 676 677 static int imxdma_config_write(struct dma_chan *chan, 678 struct dma_slave_config *dmaengine_cfg, 679 enum dma_transfer_direction direction) 680 { 681 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 682 struct imxdma_engine *imxdma = imxdmac->imxdma; 683 unsigned int mode = 0; 684 685 if (direction == DMA_DEV_TO_MEM) { 686 imxdmac->per_address = dmaengine_cfg->src_addr; 687 imxdmac->watermark_level = dmaengine_cfg->src_maxburst; 688 imxdmac->word_size = dmaengine_cfg->src_addr_width; 689 } else { 690 imxdmac->per_address = dmaengine_cfg->dst_addr; 691 imxdmac->watermark_level = dmaengine_cfg->dst_maxburst; 692 imxdmac->word_size = dmaengine_cfg->dst_addr_width; 693 } 694 695 switch (imxdmac->word_size) { 696 case DMA_SLAVE_BUSWIDTH_1_BYTE: 697 mode = IMX_DMA_MEMSIZE_8; 698 break; 699 case DMA_SLAVE_BUSWIDTH_2_BYTES: 700 mode = IMX_DMA_MEMSIZE_16; 701 break; 702 default: 703 case DMA_SLAVE_BUSWIDTH_4_BYTES: 704 mode = IMX_DMA_MEMSIZE_32; 705 break; 706 } 707 708 imxdmac->hw_chaining = 0; 709 710 imxdmac->ccr_from_device = (mode | IMX_DMA_TYPE_FIFO) | 711 ((IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) << 2) | 712 CCR_REN; 713 imxdmac->ccr_to_device = 714 (IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) | 715 ((mode | IMX_DMA_TYPE_FIFO) << 2) | CCR_REN; 716 imx_dmav1_writel(imxdma, imxdmac->dma_request, 717 DMA_RSSR(imxdmac->channel)); 718 719 /* Set burst length */ 720 imx_dmav1_writel(imxdma, imxdmac->watermark_level * 721 imxdmac->word_size, DMA_BLR(imxdmac->channel)); 722 723 return 0; 724 } 725 726 static int imxdma_config(struct dma_chan *chan, 727 struct dma_slave_config *dmaengine_cfg) 728 { 729 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 730 731 memcpy(&imxdmac->config, dmaengine_cfg, sizeof(*dmaengine_cfg)); 732 733 return 0; 734 } 735 736 static enum dma_status imxdma_tx_status(struct dma_chan *chan, 737 dma_cookie_t cookie, 738 struct dma_tx_state *txstate) 739 { 740 return dma_cookie_status(chan, cookie, txstate); 741 } 742 743 static dma_cookie_t imxdma_tx_submit(struct dma_async_tx_descriptor *tx) 744 { 745 struct imxdma_channel *imxdmac = to_imxdma_chan(tx->chan); 746 struct imxdma_engine *imxdma = imxdmac->imxdma; 747 dma_cookie_t cookie; 748 unsigned long flags; 749 750 spin_lock_irqsave(&imxdma->lock, flags); 751 list_move_tail(imxdmac->ld_free.next, &imxdmac->ld_queue); 752 cookie = dma_cookie_assign(tx); 753 spin_unlock_irqrestore(&imxdma->lock, flags); 754 755 return cookie; 756 } 757 758 static int imxdma_alloc_chan_resources(struct dma_chan *chan) 759 { 760 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 761 struct imx_dma_data *data = chan->private; 762 763 if (data != NULL) 764 imxdmac->dma_request = data->dma_request; 765 766 while (imxdmac->descs_allocated < IMXDMA_MAX_CHAN_DESCRIPTORS) { 767 struct imxdma_desc *desc; 768 769 desc = kzalloc(sizeof(*desc), GFP_KERNEL); 770 if (!desc) 771 break; 772 memset(&desc->desc, 0, sizeof(struct dma_async_tx_descriptor)); 773 dma_async_tx_descriptor_init(&desc->desc, chan); 774 desc->desc.tx_submit = imxdma_tx_submit; 775 /* txd.flags will be overwritten in prep funcs */ 776 desc->desc.flags = DMA_CTRL_ACK; 777 desc->status = DMA_COMPLETE; 778 779 list_add_tail(&desc->node, &imxdmac->ld_free); 780 imxdmac->descs_allocated++; 781 } 782 783 if (!imxdmac->descs_allocated) 784 return -ENOMEM; 785 786 return imxdmac->descs_allocated; 787 } 788 789 static void imxdma_free_chan_resources(struct dma_chan *chan) 790 { 791 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 792 struct imxdma_engine *imxdma = imxdmac->imxdma; 793 struct imxdma_desc *desc, *_desc; 794 unsigned long flags; 795 796 spin_lock_irqsave(&imxdma->lock, flags); 797 798 imxdma_disable_hw(imxdmac); 799 list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free); 800 list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free); 801 802 spin_unlock_irqrestore(&imxdma->lock, flags); 803 804 list_for_each_entry_safe(desc, _desc, &imxdmac->ld_free, node) { 805 kfree(desc); 806 imxdmac->descs_allocated--; 807 } 808 INIT_LIST_HEAD(&imxdmac->ld_free); 809 810 kfree(imxdmac->sg_list); 811 imxdmac->sg_list = NULL; 812 } 813 814 static struct dma_async_tx_descriptor *imxdma_prep_slave_sg( 815 struct dma_chan *chan, struct scatterlist *sgl, 816 unsigned int sg_len, enum dma_transfer_direction direction, 817 unsigned long flags, void *context) 818 { 819 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 820 struct scatterlist *sg; 821 int i, dma_length = 0; 822 struct imxdma_desc *desc; 823 824 if (list_empty(&imxdmac->ld_free) || 825 imxdma_chan_is_doing_cyclic(imxdmac)) 826 return NULL; 827 828 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); 829 830 for_each_sg(sgl, sg, sg_len, i) { 831 dma_length += sg_dma_len(sg); 832 } 833 834 switch (imxdmac->word_size) { 835 case DMA_SLAVE_BUSWIDTH_4_BYTES: 836 if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3) 837 return NULL; 838 break; 839 case DMA_SLAVE_BUSWIDTH_2_BYTES: 840 if (sg_dma_len(sgl) & 1 || sgl->dma_address & 1) 841 return NULL; 842 break; 843 case DMA_SLAVE_BUSWIDTH_1_BYTE: 844 break; 845 default: 846 return NULL; 847 } 848 849 desc->type = IMXDMA_DESC_SLAVE_SG; 850 desc->sg = sgl; 851 desc->sgcount = sg_len; 852 desc->len = dma_length; 853 desc->direction = direction; 854 if (direction == DMA_DEV_TO_MEM) { 855 desc->src = imxdmac->per_address; 856 } else { 857 desc->dest = imxdmac->per_address; 858 } 859 desc->desc.callback = NULL; 860 desc->desc.callback_param = NULL; 861 862 return &desc->desc; 863 } 864 865 static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic( 866 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, 867 size_t period_len, enum dma_transfer_direction direction, 868 unsigned long flags) 869 { 870 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 871 struct imxdma_engine *imxdma = imxdmac->imxdma; 872 struct imxdma_desc *desc; 873 int i; 874 unsigned int periods = buf_len / period_len; 875 876 dev_dbg(imxdma->dev, "%s channel: %d buf_len=%zu period_len=%zu\n", 877 __func__, imxdmac->channel, buf_len, period_len); 878 879 if (list_empty(&imxdmac->ld_free) || 880 imxdma_chan_is_doing_cyclic(imxdmac)) 881 return NULL; 882 883 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); 884 885 kfree(imxdmac->sg_list); 886 887 imxdmac->sg_list = kcalloc(periods + 1, 888 sizeof(struct scatterlist), GFP_ATOMIC); 889 if (!imxdmac->sg_list) 890 return NULL; 891 892 sg_init_table(imxdmac->sg_list, periods); 893 894 for (i = 0; i < periods; i++) { 895 sg_assign_page(&imxdmac->sg_list[i], NULL); 896 imxdmac->sg_list[i].offset = 0; 897 imxdmac->sg_list[i].dma_address = dma_addr; 898 sg_dma_len(&imxdmac->sg_list[i]) = period_len; 899 dma_addr += period_len; 900 } 901 902 /* close the loop */ 903 sg_chain(imxdmac->sg_list, periods + 1, imxdmac->sg_list); 904 905 desc->type = IMXDMA_DESC_CYCLIC; 906 desc->sg = imxdmac->sg_list; 907 desc->sgcount = periods; 908 desc->len = IMX_DMA_LENGTH_LOOP; 909 desc->direction = direction; 910 if (direction == DMA_DEV_TO_MEM) { 911 desc->src = imxdmac->per_address; 912 } else { 913 desc->dest = imxdmac->per_address; 914 } 915 desc->desc.callback = NULL; 916 desc->desc.callback_param = NULL; 917 918 imxdma_config_write(chan, &imxdmac->config, direction); 919 920 return &desc->desc; 921 } 922 923 static struct dma_async_tx_descriptor *imxdma_prep_dma_memcpy( 924 struct dma_chan *chan, dma_addr_t dest, 925 dma_addr_t src, size_t len, unsigned long flags) 926 { 927 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 928 struct imxdma_engine *imxdma = imxdmac->imxdma; 929 struct imxdma_desc *desc; 930 931 dev_dbg(imxdma->dev, "%s channel: %d src=0x%llx dst=0x%llx len=%zu\n", 932 __func__, imxdmac->channel, (unsigned long long)src, 933 (unsigned long long)dest, len); 934 935 if (list_empty(&imxdmac->ld_free) || 936 imxdma_chan_is_doing_cyclic(imxdmac)) 937 return NULL; 938 939 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); 940 941 desc->type = IMXDMA_DESC_MEMCPY; 942 desc->src = src; 943 desc->dest = dest; 944 desc->len = len; 945 desc->direction = DMA_MEM_TO_MEM; 946 desc->config_port = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR; 947 desc->config_mem = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR; 948 desc->desc.callback = NULL; 949 desc->desc.callback_param = NULL; 950 951 return &desc->desc; 952 } 953 954 static struct dma_async_tx_descriptor *imxdma_prep_dma_interleaved( 955 struct dma_chan *chan, struct dma_interleaved_template *xt, 956 unsigned long flags) 957 { 958 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 959 struct imxdma_engine *imxdma = imxdmac->imxdma; 960 struct imxdma_desc *desc; 961 962 dev_dbg(imxdma->dev, "%s channel: %d src_start=0x%llx dst_start=0x%llx\n" 963 " src_sgl=%s dst_sgl=%s numf=%zu frame_size=%zu\n", __func__, 964 imxdmac->channel, (unsigned long long)xt->src_start, 965 (unsigned long long) xt->dst_start, 966 xt->src_sgl ? "true" : "false", xt->dst_sgl ? "true" : "false", 967 xt->numf, xt->frame_size); 968 969 if (list_empty(&imxdmac->ld_free) || 970 imxdma_chan_is_doing_cyclic(imxdmac)) 971 return NULL; 972 973 if (xt->frame_size != 1 || xt->numf <= 0 || xt->dir != DMA_MEM_TO_MEM) 974 return NULL; 975 976 desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); 977 978 desc->type = IMXDMA_DESC_INTERLEAVED; 979 desc->src = xt->src_start; 980 desc->dest = xt->dst_start; 981 desc->x = xt->sgl[0].size; 982 desc->y = xt->numf; 983 desc->w = xt->sgl[0].icg + desc->x; 984 desc->len = desc->x * desc->y; 985 desc->direction = DMA_MEM_TO_MEM; 986 desc->config_port = IMX_DMA_MEMSIZE_32; 987 desc->config_mem = IMX_DMA_MEMSIZE_32; 988 if (xt->src_sgl) 989 desc->config_mem |= IMX_DMA_TYPE_2D; 990 if (xt->dst_sgl) 991 desc->config_port |= IMX_DMA_TYPE_2D; 992 desc->desc.callback = NULL; 993 desc->desc.callback_param = NULL; 994 995 return &desc->desc; 996 } 997 998 static void imxdma_issue_pending(struct dma_chan *chan) 999 { 1000 struct imxdma_channel *imxdmac = to_imxdma_chan(chan); 1001 struct imxdma_engine *imxdma = imxdmac->imxdma; 1002 struct imxdma_desc *desc; 1003 unsigned long flags; 1004 1005 spin_lock_irqsave(&imxdma->lock, flags); 1006 if (list_empty(&imxdmac->ld_active) && 1007 !list_empty(&imxdmac->ld_queue)) { 1008 desc = list_first_entry(&imxdmac->ld_queue, 1009 struct imxdma_desc, node); 1010 1011 if (imxdma_xfer_desc(desc) < 0) { 1012 dev_warn(imxdma->dev, 1013 "%s: channel: %d couldn't issue DMA xfer\n", 1014 __func__, imxdmac->channel); 1015 } else { 1016 list_move_tail(imxdmac->ld_queue.next, 1017 &imxdmac->ld_active); 1018 } 1019 } 1020 spin_unlock_irqrestore(&imxdma->lock, flags); 1021 } 1022 1023 static bool imxdma_filter_fn(struct dma_chan *chan, void *param) 1024 { 1025 struct imxdma_filter_data *fdata = param; 1026 struct imxdma_channel *imxdma_chan = to_imxdma_chan(chan); 1027 1028 if (chan->device->dev != fdata->imxdma->dev) 1029 return false; 1030 1031 imxdma_chan->dma_request = fdata->request; 1032 chan->private = NULL; 1033 1034 return true; 1035 } 1036 1037 static struct dma_chan *imxdma_xlate(struct of_phandle_args *dma_spec, 1038 struct of_dma *ofdma) 1039 { 1040 int count = dma_spec->args_count; 1041 struct imxdma_engine *imxdma = ofdma->of_dma_data; 1042 struct imxdma_filter_data fdata = { 1043 .imxdma = imxdma, 1044 }; 1045 1046 if (count != 1) 1047 return NULL; 1048 1049 fdata.request = dma_spec->args[0]; 1050 1051 return dma_request_channel(imxdma->dma_device.cap_mask, 1052 imxdma_filter_fn, &fdata); 1053 } 1054 1055 static int __init imxdma_probe(struct platform_device *pdev) 1056 { 1057 struct imxdma_engine *imxdma; 1058 struct resource *res; 1059 const struct of_device_id *of_id; 1060 int ret, i; 1061 int irq, irq_err; 1062 1063 of_id = of_match_device(imx_dma_of_dev_id, &pdev->dev); 1064 if (of_id) 1065 pdev->id_entry = of_id->data; 1066 1067 imxdma = devm_kzalloc(&pdev->dev, sizeof(*imxdma), GFP_KERNEL); 1068 if (!imxdma) 1069 return -ENOMEM; 1070 1071 imxdma->dev = &pdev->dev; 1072 imxdma->devtype = pdev->id_entry->driver_data; 1073 1074 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1075 imxdma->base = devm_ioremap_resource(&pdev->dev, res); 1076 if (IS_ERR(imxdma->base)) 1077 return PTR_ERR(imxdma->base); 1078 1079 irq = platform_get_irq(pdev, 0); 1080 if (irq < 0) 1081 return irq; 1082 1083 imxdma->dma_ipg = devm_clk_get(&pdev->dev, "ipg"); 1084 if (IS_ERR(imxdma->dma_ipg)) 1085 return PTR_ERR(imxdma->dma_ipg); 1086 1087 imxdma->dma_ahb = devm_clk_get(&pdev->dev, "ahb"); 1088 if (IS_ERR(imxdma->dma_ahb)) 1089 return PTR_ERR(imxdma->dma_ahb); 1090 1091 ret = clk_prepare_enable(imxdma->dma_ipg); 1092 if (ret) 1093 return ret; 1094 ret = clk_prepare_enable(imxdma->dma_ahb); 1095 if (ret) 1096 goto disable_dma_ipg_clk; 1097 1098 /* reset DMA module */ 1099 imx_dmav1_writel(imxdma, DCR_DRST, DMA_DCR); 1100 1101 if (is_imx1_dma(imxdma)) { 1102 ret = devm_request_irq(&pdev->dev, irq, 1103 dma_irq_handler, 0, "DMA", imxdma); 1104 if (ret) { 1105 dev_warn(imxdma->dev, "Can't register IRQ for DMA\n"); 1106 goto disable_dma_ahb_clk; 1107 } 1108 imxdma->irq = irq; 1109 1110 irq_err = platform_get_irq(pdev, 1); 1111 if (irq_err < 0) { 1112 ret = irq_err; 1113 goto disable_dma_ahb_clk; 1114 } 1115 1116 ret = devm_request_irq(&pdev->dev, irq_err, 1117 imxdma_err_handler, 0, "DMA", imxdma); 1118 if (ret) { 1119 dev_warn(imxdma->dev, "Can't register ERRIRQ for DMA\n"); 1120 goto disable_dma_ahb_clk; 1121 } 1122 imxdma->irq_err = irq_err; 1123 } 1124 1125 /* enable DMA module */ 1126 imx_dmav1_writel(imxdma, DCR_DEN, DMA_DCR); 1127 1128 /* clear all interrupts */ 1129 imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DISR); 1130 1131 /* disable interrupts */ 1132 imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR); 1133 1134 INIT_LIST_HEAD(&imxdma->dma_device.channels); 1135 1136 dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask); 1137 dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask); 1138 dma_cap_set(DMA_MEMCPY, imxdma->dma_device.cap_mask); 1139 dma_cap_set(DMA_INTERLEAVE, imxdma->dma_device.cap_mask); 1140 1141 /* Initialize 2D global parameters */ 1142 for (i = 0; i < IMX_DMA_2D_SLOTS; i++) 1143 imxdma->slots_2d[i].count = 0; 1144 1145 spin_lock_init(&imxdma->lock); 1146 1147 /* Initialize channel parameters */ 1148 for (i = 0; i < IMX_DMA_CHANNELS; i++) { 1149 struct imxdma_channel *imxdmac = &imxdma->channel[i]; 1150 1151 if (!is_imx1_dma(imxdma)) { 1152 ret = devm_request_irq(&pdev->dev, irq + i, 1153 dma_irq_handler, 0, "DMA", imxdma); 1154 if (ret) { 1155 dev_warn(imxdma->dev, "Can't register IRQ %d " 1156 "for DMA channel %d\n", 1157 irq + i, i); 1158 goto disable_dma_ahb_clk; 1159 } 1160 1161 imxdmac->irq = irq + i; 1162 timer_setup(&imxdmac->watchdog, imxdma_watchdog, 0); 1163 } 1164 1165 imxdmac->imxdma = imxdma; 1166 1167 INIT_LIST_HEAD(&imxdmac->ld_queue); 1168 INIT_LIST_HEAD(&imxdmac->ld_free); 1169 INIT_LIST_HEAD(&imxdmac->ld_active); 1170 1171 tasklet_setup(&imxdmac->dma_tasklet, imxdma_tasklet); 1172 imxdmac->chan.device = &imxdma->dma_device; 1173 dma_cookie_init(&imxdmac->chan); 1174 imxdmac->channel = i; 1175 1176 /* Add the channel to the DMAC list */ 1177 list_add_tail(&imxdmac->chan.device_node, 1178 &imxdma->dma_device.channels); 1179 } 1180 1181 imxdma->dma_device.dev = &pdev->dev; 1182 1183 imxdma->dma_device.device_alloc_chan_resources = imxdma_alloc_chan_resources; 1184 imxdma->dma_device.device_free_chan_resources = imxdma_free_chan_resources; 1185 imxdma->dma_device.device_tx_status = imxdma_tx_status; 1186 imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg; 1187 imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic; 1188 imxdma->dma_device.device_prep_dma_memcpy = imxdma_prep_dma_memcpy; 1189 imxdma->dma_device.device_prep_interleaved_dma = imxdma_prep_dma_interleaved; 1190 imxdma->dma_device.device_config = imxdma_config; 1191 imxdma->dma_device.device_terminate_all = imxdma_terminate_all; 1192 imxdma->dma_device.device_issue_pending = imxdma_issue_pending; 1193 1194 platform_set_drvdata(pdev, imxdma); 1195 1196 imxdma->dma_device.copy_align = DMAENGINE_ALIGN_4_BYTES; 1197 dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff); 1198 1199 ret = dma_async_device_register(&imxdma->dma_device); 1200 if (ret) { 1201 dev_err(&pdev->dev, "unable to register\n"); 1202 goto disable_dma_ahb_clk; 1203 } 1204 1205 if (pdev->dev.of_node) { 1206 ret = of_dma_controller_register(pdev->dev.of_node, 1207 imxdma_xlate, imxdma); 1208 if (ret) { 1209 dev_err(&pdev->dev, "unable to register of_dma_controller\n"); 1210 goto err_of_dma_controller; 1211 } 1212 } 1213 1214 return 0; 1215 1216 err_of_dma_controller: 1217 dma_async_device_unregister(&imxdma->dma_device); 1218 disable_dma_ahb_clk: 1219 clk_disable_unprepare(imxdma->dma_ahb); 1220 disable_dma_ipg_clk: 1221 clk_disable_unprepare(imxdma->dma_ipg); 1222 return ret; 1223 } 1224 1225 static void imxdma_free_irq(struct platform_device *pdev, struct imxdma_engine *imxdma) 1226 { 1227 int i; 1228 1229 if (is_imx1_dma(imxdma)) { 1230 disable_irq(imxdma->irq); 1231 disable_irq(imxdma->irq_err); 1232 } 1233 1234 for (i = 0; i < IMX_DMA_CHANNELS; i++) { 1235 struct imxdma_channel *imxdmac = &imxdma->channel[i]; 1236 1237 if (!is_imx1_dma(imxdma)) 1238 disable_irq(imxdmac->irq); 1239 1240 tasklet_kill(&imxdmac->dma_tasklet); 1241 } 1242 } 1243 1244 static int imxdma_remove(struct platform_device *pdev) 1245 { 1246 struct imxdma_engine *imxdma = platform_get_drvdata(pdev); 1247 1248 imxdma_free_irq(pdev, imxdma); 1249 1250 dma_async_device_unregister(&imxdma->dma_device); 1251 1252 if (pdev->dev.of_node) 1253 of_dma_controller_free(pdev->dev.of_node); 1254 1255 clk_disable_unprepare(imxdma->dma_ipg); 1256 clk_disable_unprepare(imxdma->dma_ahb); 1257 1258 return 0; 1259 } 1260 1261 static struct platform_driver imxdma_driver = { 1262 .driver = { 1263 .name = "imx-dma", 1264 .of_match_table = imx_dma_of_dev_id, 1265 }, 1266 .id_table = imx_dma_devtype, 1267 .remove = imxdma_remove, 1268 }; 1269 1270 static int __init imxdma_module_init(void) 1271 { 1272 return platform_driver_probe(&imxdma_driver, imxdma_probe); 1273 } 1274 subsys_initcall(imxdma_module_init); 1275 1276 MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>"); 1277 MODULE_DESCRIPTION("i.MX dma driver"); 1278 MODULE_LICENSE("GPL"); 1279