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