1 /* 2 * Copyright (C) 2017 Spreadtrum Communications Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0 5 */ 6 7 #include <linux/clk.h> 8 #include <linux/dma-mapping.h> 9 #include <linux/dma/sprd-dma.h> 10 #include <linux/errno.h> 11 #include <linux/init.h> 12 #include <linux/interrupt.h> 13 #include <linux/io.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <linux/of_dma.h> 18 #include <linux/of_device.h> 19 #include <linux/pm_runtime.h> 20 #include <linux/slab.h> 21 22 #include "virt-dma.h" 23 24 #define SPRD_DMA_CHN_REG_OFFSET 0x1000 25 #define SPRD_DMA_CHN_REG_LENGTH 0x40 26 #define SPRD_DMA_MEMCPY_MIN_SIZE 64 27 28 /* DMA global registers definition */ 29 #define SPRD_DMA_GLB_PAUSE 0x0 30 #define SPRD_DMA_GLB_FRAG_WAIT 0x4 31 #define SPRD_DMA_GLB_REQ_PEND0_EN 0x8 32 #define SPRD_DMA_GLB_REQ_PEND1_EN 0xc 33 #define SPRD_DMA_GLB_INT_RAW_STS 0x10 34 #define SPRD_DMA_GLB_INT_MSK_STS 0x14 35 #define SPRD_DMA_GLB_REQ_STS 0x18 36 #define SPRD_DMA_GLB_CHN_EN_STS 0x1c 37 #define SPRD_DMA_GLB_DEBUG_STS 0x20 38 #define SPRD_DMA_GLB_ARB_SEL_STS 0x24 39 #define SPRD_DMA_GLB_2STAGE_GRP1 0x28 40 #define SPRD_DMA_GLB_2STAGE_GRP2 0x2c 41 #define SPRD_DMA_GLB_REQ_UID(uid) (0x4 * ((uid) - 1)) 42 #define SPRD_DMA_GLB_REQ_UID_OFFSET 0x2000 43 44 /* DMA channel registers definition */ 45 #define SPRD_DMA_CHN_PAUSE 0x0 46 #define SPRD_DMA_CHN_REQ 0x4 47 #define SPRD_DMA_CHN_CFG 0x8 48 #define SPRD_DMA_CHN_INTC 0xc 49 #define SPRD_DMA_CHN_SRC_ADDR 0x10 50 #define SPRD_DMA_CHN_DES_ADDR 0x14 51 #define SPRD_DMA_CHN_FRG_LEN 0x18 52 #define SPRD_DMA_CHN_BLK_LEN 0x1c 53 #define SPRD_DMA_CHN_TRSC_LEN 0x20 54 #define SPRD_DMA_CHN_TRSF_STEP 0x24 55 #define SPRD_DMA_CHN_WARP_PTR 0x28 56 #define SPRD_DMA_CHN_WARP_TO 0x2c 57 #define SPRD_DMA_CHN_LLIST_PTR 0x30 58 #define SPRD_DMA_CHN_FRAG_STEP 0x34 59 #define SPRD_DMA_CHN_SRC_BLK_STEP 0x38 60 #define SPRD_DMA_CHN_DES_BLK_STEP 0x3c 61 62 /* SPRD_DMA_GLB_2STAGE_GRP register definition */ 63 #define SPRD_DMA_GLB_2STAGE_EN BIT(24) 64 #define SPRD_DMA_GLB_CHN_INT_MASK GENMASK(23, 20) 65 #define SPRD_DMA_GLB_DEST_INT BIT(22) 66 #define SPRD_DMA_GLB_SRC_INT BIT(20) 67 #define SPRD_DMA_GLB_LIST_DONE_TRG BIT(19) 68 #define SPRD_DMA_GLB_TRANS_DONE_TRG BIT(18) 69 #define SPRD_DMA_GLB_BLOCK_DONE_TRG BIT(17) 70 #define SPRD_DMA_GLB_FRAG_DONE_TRG BIT(16) 71 #define SPRD_DMA_GLB_TRG_OFFSET 16 72 #define SPRD_DMA_GLB_DEST_CHN_MASK GENMASK(13, 8) 73 #define SPRD_DMA_GLB_DEST_CHN_OFFSET 8 74 #define SPRD_DMA_GLB_SRC_CHN_MASK GENMASK(5, 0) 75 76 /* SPRD_DMA_CHN_INTC register definition */ 77 #define SPRD_DMA_INT_MASK GENMASK(4, 0) 78 #define SPRD_DMA_INT_CLR_OFFSET 24 79 #define SPRD_DMA_FRAG_INT_EN BIT(0) 80 #define SPRD_DMA_BLK_INT_EN BIT(1) 81 #define SPRD_DMA_TRANS_INT_EN BIT(2) 82 #define SPRD_DMA_LIST_INT_EN BIT(3) 83 #define SPRD_DMA_CFG_ERR_INT_EN BIT(4) 84 85 /* SPRD_DMA_CHN_CFG register definition */ 86 #define SPRD_DMA_CHN_EN BIT(0) 87 #define SPRD_DMA_LINKLIST_EN BIT(4) 88 #define SPRD_DMA_WAIT_BDONE_OFFSET 24 89 #define SPRD_DMA_DONOT_WAIT_BDONE 1 90 91 /* SPRD_DMA_CHN_REQ register definition */ 92 #define SPRD_DMA_REQ_EN BIT(0) 93 94 /* SPRD_DMA_CHN_PAUSE register definition */ 95 #define SPRD_DMA_PAUSE_EN BIT(0) 96 #define SPRD_DMA_PAUSE_STS BIT(2) 97 #define SPRD_DMA_PAUSE_CNT 0x2000 98 99 /* DMA_CHN_WARP_* register definition */ 100 #define SPRD_DMA_HIGH_ADDR_MASK GENMASK(31, 28) 101 #define SPRD_DMA_LOW_ADDR_MASK GENMASK(31, 0) 102 #define SPRD_DMA_WRAP_ADDR_MASK GENMASK(27, 0) 103 #define SPRD_DMA_HIGH_ADDR_OFFSET 4 104 105 /* SPRD_DMA_CHN_INTC register definition */ 106 #define SPRD_DMA_FRAG_INT_STS BIT(16) 107 #define SPRD_DMA_BLK_INT_STS BIT(17) 108 #define SPRD_DMA_TRSC_INT_STS BIT(18) 109 #define SPRD_DMA_LIST_INT_STS BIT(19) 110 #define SPRD_DMA_CFGERR_INT_STS BIT(20) 111 #define SPRD_DMA_CHN_INT_STS \ 112 (SPRD_DMA_FRAG_INT_STS | SPRD_DMA_BLK_INT_STS | \ 113 SPRD_DMA_TRSC_INT_STS | SPRD_DMA_LIST_INT_STS | \ 114 SPRD_DMA_CFGERR_INT_STS) 115 116 /* SPRD_DMA_CHN_FRG_LEN register definition */ 117 #define SPRD_DMA_SRC_DATAWIDTH_OFFSET 30 118 #define SPRD_DMA_DES_DATAWIDTH_OFFSET 28 119 #define SPRD_DMA_SWT_MODE_OFFSET 26 120 #define SPRD_DMA_REQ_MODE_OFFSET 24 121 #define SPRD_DMA_REQ_MODE_MASK GENMASK(1, 0) 122 #define SPRD_DMA_WRAP_SEL_DEST BIT(23) 123 #define SPRD_DMA_WRAP_EN BIT(22) 124 #define SPRD_DMA_FIX_SEL_OFFSET 21 125 #define SPRD_DMA_FIX_EN_OFFSET 20 126 #define SPRD_DMA_LLIST_END BIT(19) 127 #define SPRD_DMA_FRG_LEN_MASK GENMASK(16, 0) 128 129 /* SPRD_DMA_CHN_BLK_LEN register definition */ 130 #define SPRD_DMA_BLK_LEN_MASK GENMASK(16, 0) 131 132 /* SPRD_DMA_CHN_TRSC_LEN register definition */ 133 #define SPRD_DMA_TRSC_LEN_MASK GENMASK(27, 0) 134 135 /* SPRD_DMA_CHN_TRSF_STEP register definition */ 136 #define SPRD_DMA_DEST_TRSF_STEP_OFFSET 16 137 #define SPRD_DMA_SRC_TRSF_STEP_OFFSET 0 138 #define SPRD_DMA_TRSF_STEP_MASK GENMASK(15, 0) 139 140 /* SPRD DMA_SRC_BLK_STEP register definition */ 141 #define SPRD_DMA_LLIST_HIGH_MASK GENMASK(31, 28) 142 #define SPRD_DMA_LLIST_HIGH_SHIFT 28 143 144 /* define DMA channel mode & trigger mode mask */ 145 #define SPRD_DMA_CHN_MODE_MASK GENMASK(7, 0) 146 #define SPRD_DMA_TRG_MODE_MASK GENMASK(7, 0) 147 #define SPRD_DMA_INT_TYPE_MASK GENMASK(7, 0) 148 149 /* define the DMA transfer step type */ 150 #define SPRD_DMA_NONE_STEP 0 151 #define SPRD_DMA_BYTE_STEP 1 152 #define SPRD_DMA_SHORT_STEP 2 153 #define SPRD_DMA_WORD_STEP 4 154 #define SPRD_DMA_DWORD_STEP 8 155 156 #define SPRD_DMA_SOFTWARE_UID 0 157 158 /* dma data width values */ 159 enum sprd_dma_datawidth { 160 SPRD_DMA_DATAWIDTH_1_BYTE, 161 SPRD_DMA_DATAWIDTH_2_BYTES, 162 SPRD_DMA_DATAWIDTH_4_BYTES, 163 SPRD_DMA_DATAWIDTH_8_BYTES, 164 }; 165 166 /* dma channel hardware configuration */ 167 struct sprd_dma_chn_hw { 168 u32 pause; 169 u32 req; 170 u32 cfg; 171 u32 intc; 172 u32 src_addr; 173 u32 des_addr; 174 u32 frg_len; 175 u32 blk_len; 176 u32 trsc_len; 177 u32 trsf_step; 178 u32 wrap_ptr; 179 u32 wrap_to; 180 u32 llist_ptr; 181 u32 frg_step; 182 u32 src_blk_step; 183 u32 des_blk_step; 184 }; 185 186 /* dma request description */ 187 struct sprd_dma_desc { 188 struct virt_dma_desc vd; 189 struct sprd_dma_chn_hw chn_hw; 190 enum dma_transfer_direction dir; 191 }; 192 193 /* dma channel description */ 194 struct sprd_dma_chn { 195 struct virt_dma_chan vc; 196 void __iomem *chn_base; 197 struct sprd_dma_linklist linklist; 198 struct dma_slave_config slave_cfg; 199 u32 chn_num; 200 u32 dev_id; 201 enum sprd_dma_chn_mode chn_mode; 202 enum sprd_dma_trg_mode trg_mode; 203 enum sprd_dma_int_type int_type; 204 struct sprd_dma_desc *cur_desc; 205 }; 206 207 /* SPRD dma device */ 208 struct sprd_dma_dev { 209 struct dma_device dma_dev; 210 void __iomem *glb_base; 211 struct clk *clk; 212 struct clk *ashb_clk; 213 int irq; 214 u32 total_chns; 215 struct sprd_dma_chn channels[]; 216 }; 217 218 static void sprd_dma_free_desc(struct virt_dma_desc *vd); 219 static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param); 220 static struct of_dma_filter_info sprd_dma_info = { 221 .filter_fn = sprd_dma_filter_fn, 222 }; 223 224 static inline struct sprd_dma_chn *to_sprd_dma_chan(struct dma_chan *c) 225 { 226 return container_of(c, struct sprd_dma_chn, vc.chan); 227 } 228 229 static inline struct sprd_dma_dev *to_sprd_dma_dev(struct dma_chan *c) 230 { 231 struct sprd_dma_chn *schan = to_sprd_dma_chan(c); 232 233 return container_of(schan, struct sprd_dma_dev, channels[c->chan_id]); 234 } 235 236 static inline struct sprd_dma_desc *to_sprd_dma_desc(struct virt_dma_desc *vd) 237 { 238 return container_of(vd, struct sprd_dma_desc, vd); 239 } 240 241 static void sprd_dma_glb_update(struct sprd_dma_dev *sdev, u32 reg, 242 u32 mask, u32 val) 243 { 244 u32 orig = readl(sdev->glb_base + reg); 245 u32 tmp; 246 247 tmp = (orig & ~mask) | val; 248 writel(tmp, sdev->glb_base + reg); 249 } 250 251 static void sprd_dma_chn_update(struct sprd_dma_chn *schan, u32 reg, 252 u32 mask, u32 val) 253 { 254 u32 orig = readl(schan->chn_base + reg); 255 u32 tmp; 256 257 tmp = (orig & ~mask) | val; 258 writel(tmp, schan->chn_base + reg); 259 } 260 261 static int sprd_dma_enable(struct sprd_dma_dev *sdev) 262 { 263 int ret; 264 265 ret = clk_prepare_enable(sdev->clk); 266 if (ret) 267 return ret; 268 269 /* 270 * The ashb_clk is optional and only for AGCP DMA controller, so we 271 * need add one condition to check if the ashb_clk need enable. 272 */ 273 if (!IS_ERR(sdev->ashb_clk)) 274 ret = clk_prepare_enable(sdev->ashb_clk); 275 276 return ret; 277 } 278 279 static void sprd_dma_disable(struct sprd_dma_dev *sdev) 280 { 281 clk_disable_unprepare(sdev->clk); 282 283 /* 284 * Need to check if we need disable the optional ashb_clk for AGCP DMA. 285 */ 286 if (!IS_ERR(sdev->ashb_clk)) 287 clk_disable_unprepare(sdev->ashb_clk); 288 } 289 290 static void sprd_dma_set_uid(struct sprd_dma_chn *schan) 291 { 292 struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan); 293 u32 dev_id = schan->dev_id; 294 295 if (dev_id != SPRD_DMA_SOFTWARE_UID) { 296 u32 uid_offset = SPRD_DMA_GLB_REQ_UID_OFFSET + 297 SPRD_DMA_GLB_REQ_UID(dev_id); 298 299 writel(schan->chn_num + 1, sdev->glb_base + uid_offset); 300 } 301 } 302 303 static void sprd_dma_unset_uid(struct sprd_dma_chn *schan) 304 { 305 struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan); 306 u32 dev_id = schan->dev_id; 307 308 if (dev_id != SPRD_DMA_SOFTWARE_UID) { 309 u32 uid_offset = SPRD_DMA_GLB_REQ_UID_OFFSET + 310 SPRD_DMA_GLB_REQ_UID(dev_id); 311 312 writel(0, sdev->glb_base + uid_offset); 313 } 314 } 315 316 static void sprd_dma_clear_int(struct sprd_dma_chn *schan) 317 { 318 sprd_dma_chn_update(schan, SPRD_DMA_CHN_INTC, 319 SPRD_DMA_INT_MASK << SPRD_DMA_INT_CLR_OFFSET, 320 SPRD_DMA_INT_MASK << SPRD_DMA_INT_CLR_OFFSET); 321 } 322 323 static void sprd_dma_enable_chn(struct sprd_dma_chn *schan) 324 { 325 sprd_dma_chn_update(schan, SPRD_DMA_CHN_CFG, SPRD_DMA_CHN_EN, 326 SPRD_DMA_CHN_EN); 327 } 328 329 static void sprd_dma_disable_chn(struct sprd_dma_chn *schan) 330 { 331 sprd_dma_chn_update(schan, SPRD_DMA_CHN_CFG, SPRD_DMA_CHN_EN, 0); 332 } 333 334 static void sprd_dma_soft_request(struct sprd_dma_chn *schan) 335 { 336 sprd_dma_chn_update(schan, SPRD_DMA_CHN_REQ, SPRD_DMA_REQ_EN, 337 SPRD_DMA_REQ_EN); 338 } 339 340 static void sprd_dma_pause_resume(struct sprd_dma_chn *schan, bool enable) 341 { 342 struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan); 343 u32 pause, timeout = SPRD_DMA_PAUSE_CNT; 344 345 if (enable) { 346 sprd_dma_chn_update(schan, SPRD_DMA_CHN_PAUSE, 347 SPRD_DMA_PAUSE_EN, SPRD_DMA_PAUSE_EN); 348 349 do { 350 pause = readl(schan->chn_base + SPRD_DMA_CHN_PAUSE); 351 if (pause & SPRD_DMA_PAUSE_STS) 352 break; 353 354 cpu_relax(); 355 } while (--timeout > 0); 356 357 if (!timeout) 358 dev_warn(sdev->dma_dev.dev, 359 "pause dma controller timeout\n"); 360 } else { 361 sprd_dma_chn_update(schan, SPRD_DMA_CHN_PAUSE, 362 SPRD_DMA_PAUSE_EN, 0); 363 } 364 } 365 366 static void sprd_dma_stop_and_disable(struct sprd_dma_chn *schan) 367 { 368 u32 cfg = readl(schan->chn_base + SPRD_DMA_CHN_CFG); 369 370 if (!(cfg & SPRD_DMA_CHN_EN)) 371 return; 372 373 sprd_dma_pause_resume(schan, true); 374 sprd_dma_disable_chn(schan); 375 } 376 377 static unsigned long sprd_dma_get_src_addr(struct sprd_dma_chn *schan) 378 { 379 unsigned long addr, addr_high; 380 381 addr = readl(schan->chn_base + SPRD_DMA_CHN_SRC_ADDR); 382 addr_high = readl(schan->chn_base + SPRD_DMA_CHN_WARP_PTR) & 383 SPRD_DMA_HIGH_ADDR_MASK; 384 385 return addr | (addr_high << SPRD_DMA_HIGH_ADDR_OFFSET); 386 } 387 388 static unsigned long sprd_dma_get_dst_addr(struct sprd_dma_chn *schan) 389 { 390 unsigned long addr, addr_high; 391 392 addr = readl(schan->chn_base + SPRD_DMA_CHN_DES_ADDR); 393 addr_high = readl(schan->chn_base + SPRD_DMA_CHN_WARP_TO) & 394 SPRD_DMA_HIGH_ADDR_MASK; 395 396 return addr | (addr_high << SPRD_DMA_HIGH_ADDR_OFFSET); 397 } 398 399 static enum sprd_dma_int_type sprd_dma_get_int_type(struct sprd_dma_chn *schan) 400 { 401 struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan); 402 u32 intc_sts = readl(schan->chn_base + SPRD_DMA_CHN_INTC) & 403 SPRD_DMA_CHN_INT_STS; 404 405 switch (intc_sts) { 406 case SPRD_DMA_CFGERR_INT_STS: 407 return SPRD_DMA_CFGERR_INT; 408 409 case SPRD_DMA_LIST_INT_STS: 410 return SPRD_DMA_LIST_INT; 411 412 case SPRD_DMA_TRSC_INT_STS: 413 return SPRD_DMA_TRANS_INT; 414 415 case SPRD_DMA_BLK_INT_STS: 416 return SPRD_DMA_BLK_INT; 417 418 case SPRD_DMA_FRAG_INT_STS: 419 return SPRD_DMA_FRAG_INT; 420 421 default: 422 dev_warn(sdev->dma_dev.dev, "incorrect dma interrupt type\n"); 423 return SPRD_DMA_NO_INT; 424 } 425 } 426 427 static enum sprd_dma_req_mode sprd_dma_get_req_type(struct sprd_dma_chn *schan) 428 { 429 u32 frag_reg = readl(schan->chn_base + SPRD_DMA_CHN_FRG_LEN); 430 431 return (frag_reg >> SPRD_DMA_REQ_MODE_OFFSET) & SPRD_DMA_REQ_MODE_MASK; 432 } 433 434 static int sprd_dma_set_2stage_config(struct sprd_dma_chn *schan) 435 { 436 struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan); 437 u32 val, chn = schan->chn_num + 1; 438 439 switch (schan->chn_mode) { 440 case SPRD_DMA_SRC_CHN0: 441 val = chn & SPRD_DMA_GLB_SRC_CHN_MASK; 442 val |= BIT(schan->trg_mode - 1) << SPRD_DMA_GLB_TRG_OFFSET; 443 val |= SPRD_DMA_GLB_2STAGE_EN; 444 if (schan->int_type != SPRD_DMA_NO_INT) 445 val |= SPRD_DMA_GLB_SRC_INT; 446 447 sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP1, val, val); 448 break; 449 450 case SPRD_DMA_SRC_CHN1: 451 val = chn & SPRD_DMA_GLB_SRC_CHN_MASK; 452 val |= BIT(schan->trg_mode - 1) << SPRD_DMA_GLB_TRG_OFFSET; 453 val |= SPRD_DMA_GLB_2STAGE_EN; 454 if (schan->int_type != SPRD_DMA_NO_INT) 455 val |= SPRD_DMA_GLB_SRC_INT; 456 457 sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP2, val, val); 458 break; 459 460 case SPRD_DMA_DST_CHN0: 461 val = (chn << SPRD_DMA_GLB_DEST_CHN_OFFSET) & 462 SPRD_DMA_GLB_DEST_CHN_MASK; 463 val |= SPRD_DMA_GLB_2STAGE_EN; 464 if (schan->int_type != SPRD_DMA_NO_INT) 465 val |= SPRD_DMA_GLB_DEST_INT; 466 467 sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP1, val, val); 468 break; 469 470 case SPRD_DMA_DST_CHN1: 471 val = (chn << SPRD_DMA_GLB_DEST_CHN_OFFSET) & 472 SPRD_DMA_GLB_DEST_CHN_MASK; 473 val |= SPRD_DMA_GLB_2STAGE_EN; 474 if (schan->int_type != SPRD_DMA_NO_INT) 475 val |= SPRD_DMA_GLB_DEST_INT; 476 477 sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP2, val, val); 478 break; 479 480 default: 481 dev_err(sdev->dma_dev.dev, "invalid channel mode setting %d\n", 482 schan->chn_mode); 483 return -EINVAL; 484 } 485 486 return 0; 487 } 488 489 static void sprd_dma_set_pending(struct sprd_dma_chn *schan, bool enable) 490 { 491 struct sprd_dma_dev *sdev = to_sprd_dma_dev(&schan->vc.chan); 492 u32 reg, val, req_id; 493 494 if (schan->dev_id == SPRD_DMA_SOFTWARE_UID) 495 return; 496 497 /* The DMA request id always starts from 0. */ 498 req_id = schan->dev_id - 1; 499 500 if (req_id < 32) { 501 reg = SPRD_DMA_GLB_REQ_PEND0_EN; 502 val = BIT(req_id); 503 } else { 504 reg = SPRD_DMA_GLB_REQ_PEND1_EN; 505 val = BIT(req_id - 32); 506 } 507 508 sprd_dma_glb_update(sdev, reg, val, enable ? val : 0); 509 } 510 511 static void sprd_dma_set_chn_config(struct sprd_dma_chn *schan, 512 struct sprd_dma_desc *sdesc) 513 { 514 struct sprd_dma_chn_hw *cfg = &sdesc->chn_hw; 515 516 writel(cfg->pause, schan->chn_base + SPRD_DMA_CHN_PAUSE); 517 writel(cfg->cfg, schan->chn_base + SPRD_DMA_CHN_CFG); 518 writel(cfg->intc, schan->chn_base + SPRD_DMA_CHN_INTC); 519 writel(cfg->src_addr, schan->chn_base + SPRD_DMA_CHN_SRC_ADDR); 520 writel(cfg->des_addr, schan->chn_base + SPRD_DMA_CHN_DES_ADDR); 521 writel(cfg->frg_len, schan->chn_base + SPRD_DMA_CHN_FRG_LEN); 522 writel(cfg->blk_len, schan->chn_base + SPRD_DMA_CHN_BLK_LEN); 523 writel(cfg->trsc_len, schan->chn_base + SPRD_DMA_CHN_TRSC_LEN); 524 writel(cfg->trsf_step, schan->chn_base + SPRD_DMA_CHN_TRSF_STEP); 525 writel(cfg->wrap_ptr, schan->chn_base + SPRD_DMA_CHN_WARP_PTR); 526 writel(cfg->wrap_to, schan->chn_base + SPRD_DMA_CHN_WARP_TO); 527 writel(cfg->llist_ptr, schan->chn_base + SPRD_DMA_CHN_LLIST_PTR); 528 writel(cfg->frg_step, schan->chn_base + SPRD_DMA_CHN_FRAG_STEP); 529 writel(cfg->src_blk_step, schan->chn_base + SPRD_DMA_CHN_SRC_BLK_STEP); 530 writel(cfg->des_blk_step, schan->chn_base + SPRD_DMA_CHN_DES_BLK_STEP); 531 writel(cfg->req, schan->chn_base + SPRD_DMA_CHN_REQ); 532 } 533 534 static void sprd_dma_start(struct sprd_dma_chn *schan) 535 { 536 struct virt_dma_desc *vd = vchan_next_desc(&schan->vc); 537 538 if (!vd) 539 return; 540 541 list_del(&vd->node); 542 schan->cur_desc = to_sprd_dma_desc(vd); 543 544 /* 545 * Set 2-stage configuration if the channel starts one 2-stage 546 * transfer. 547 */ 548 if (schan->chn_mode && sprd_dma_set_2stage_config(schan)) 549 return; 550 551 /* 552 * Copy the DMA configuration from DMA descriptor to this hardware 553 * channel. 554 */ 555 sprd_dma_set_chn_config(schan, schan->cur_desc); 556 sprd_dma_set_uid(schan); 557 sprd_dma_set_pending(schan, true); 558 sprd_dma_enable_chn(schan); 559 560 if (schan->dev_id == SPRD_DMA_SOFTWARE_UID && 561 schan->chn_mode != SPRD_DMA_DST_CHN0 && 562 schan->chn_mode != SPRD_DMA_DST_CHN1) 563 sprd_dma_soft_request(schan); 564 } 565 566 static void sprd_dma_stop(struct sprd_dma_chn *schan) 567 { 568 sprd_dma_stop_and_disable(schan); 569 sprd_dma_set_pending(schan, false); 570 sprd_dma_unset_uid(schan); 571 sprd_dma_clear_int(schan); 572 schan->cur_desc = NULL; 573 } 574 575 static bool sprd_dma_check_trans_done(struct sprd_dma_desc *sdesc, 576 enum sprd_dma_int_type int_type, 577 enum sprd_dma_req_mode req_mode) 578 { 579 if (int_type == SPRD_DMA_NO_INT) 580 return false; 581 582 if (int_type >= req_mode + 1) 583 return true; 584 else 585 return false; 586 } 587 588 static irqreturn_t dma_irq_handle(int irq, void *dev_id) 589 { 590 struct sprd_dma_dev *sdev = (struct sprd_dma_dev *)dev_id; 591 u32 irq_status = readl(sdev->glb_base + SPRD_DMA_GLB_INT_MSK_STS); 592 struct sprd_dma_chn *schan; 593 struct sprd_dma_desc *sdesc; 594 enum sprd_dma_req_mode req_type; 595 enum sprd_dma_int_type int_type; 596 bool trans_done = false, cyclic = false; 597 u32 i; 598 599 while (irq_status) { 600 i = __ffs(irq_status); 601 irq_status &= (irq_status - 1); 602 schan = &sdev->channels[i]; 603 604 spin_lock(&schan->vc.lock); 605 606 sdesc = schan->cur_desc; 607 if (!sdesc) { 608 spin_unlock(&schan->vc.lock); 609 return IRQ_HANDLED; 610 } 611 612 int_type = sprd_dma_get_int_type(schan); 613 req_type = sprd_dma_get_req_type(schan); 614 sprd_dma_clear_int(schan); 615 616 /* cyclic mode schedule callback */ 617 cyclic = schan->linklist.phy_addr ? true : false; 618 if (cyclic == true) { 619 vchan_cyclic_callback(&sdesc->vd); 620 } else { 621 /* Check if the dma request descriptor is done. */ 622 trans_done = sprd_dma_check_trans_done(sdesc, int_type, 623 req_type); 624 if (trans_done == true) { 625 vchan_cookie_complete(&sdesc->vd); 626 schan->cur_desc = NULL; 627 sprd_dma_start(schan); 628 } 629 } 630 spin_unlock(&schan->vc.lock); 631 } 632 633 return IRQ_HANDLED; 634 } 635 636 static int sprd_dma_alloc_chan_resources(struct dma_chan *chan) 637 { 638 return pm_runtime_get_sync(chan->device->dev); 639 } 640 641 static void sprd_dma_free_chan_resources(struct dma_chan *chan) 642 { 643 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); 644 struct virt_dma_desc *cur_vd = NULL; 645 unsigned long flags; 646 647 spin_lock_irqsave(&schan->vc.lock, flags); 648 if (schan->cur_desc) 649 cur_vd = &schan->cur_desc->vd; 650 651 sprd_dma_stop(schan); 652 spin_unlock_irqrestore(&schan->vc.lock, flags); 653 654 if (cur_vd) 655 sprd_dma_free_desc(cur_vd); 656 657 vchan_free_chan_resources(&schan->vc); 658 pm_runtime_put(chan->device->dev); 659 } 660 661 static enum dma_status sprd_dma_tx_status(struct dma_chan *chan, 662 dma_cookie_t cookie, 663 struct dma_tx_state *txstate) 664 { 665 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); 666 struct virt_dma_desc *vd; 667 unsigned long flags; 668 enum dma_status ret; 669 u32 pos; 670 671 ret = dma_cookie_status(chan, cookie, txstate); 672 if (ret == DMA_COMPLETE || !txstate) 673 return ret; 674 675 spin_lock_irqsave(&schan->vc.lock, flags); 676 vd = vchan_find_desc(&schan->vc, cookie); 677 if (vd) { 678 struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd); 679 struct sprd_dma_chn_hw *hw = &sdesc->chn_hw; 680 681 if (hw->trsc_len > 0) 682 pos = hw->trsc_len; 683 else if (hw->blk_len > 0) 684 pos = hw->blk_len; 685 else if (hw->frg_len > 0) 686 pos = hw->frg_len; 687 else 688 pos = 0; 689 } else if (schan->cur_desc && schan->cur_desc->vd.tx.cookie == cookie) { 690 struct sprd_dma_desc *sdesc = schan->cur_desc; 691 692 if (sdesc->dir == DMA_DEV_TO_MEM) 693 pos = sprd_dma_get_dst_addr(schan); 694 else 695 pos = sprd_dma_get_src_addr(schan); 696 } else { 697 pos = 0; 698 } 699 spin_unlock_irqrestore(&schan->vc.lock, flags); 700 701 dma_set_residue(txstate, pos); 702 return ret; 703 } 704 705 static void sprd_dma_issue_pending(struct dma_chan *chan) 706 { 707 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); 708 unsigned long flags; 709 710 spin_lock_irqsave(&schan->vc.lock, flags); 711 if (vchan_issue_pending(&schan->vc) && !schan->cur_desc) 712 sprd_dma_start(schan); 713 spin_unlock_irqrestore(&schan->vc.lock, flags); 714 } 715 716 static int sprd_dma_get_datawidth(enum dma_slave_buswidth buswidth) 717 { 718 switch (buswidth) { 719 case DMA_SLAVE_BUSWIDTH_1_BYTE: 720 case DMA_SLAVE_BUSWIDTH_2_BYTES: 721 case DMA_SLAVE_BUSWIDTH_4_BYTES: 722 case DMA_SLAVE_BUSWIDTH_8_BYTES: 723 return ffs(buswidth) - 1; 724 725 default: 726 return -EINVAL; 727 } 728 } 729 730 static int sprd_dma_get_step(enum dma_slave_buswidth buswidth) 731 { 732 switch (buswidth) { 733 case DMA_SLAVE_BUSWIDTH_1_BYTE: 734 case DMA_SLAVE_BUSWIDTH_2_BYTES: 735 case DMA_SLAVE_BUSWIDTH_4_BYTES: 736 case DMA_SLAVE_BUSWIDTH_8_BYTES: 737 return buswidth; 738 739 default: 740 return -EINVAL; 741 } 742 } 743 744 static int sprd_dma_fill_desc(struct dma_chan *chan, 745 struct sprd_dma_chn_hw *hw, 746 unsigned int sglen, int sg_index, 747 dma_addr_t src, dma_addr_t dst, u32 len, 748 enum dma_transfer_direction dir, 749 unsigned long flags, 750 struct dma_slave_config *slave_cfg) 751 { 752 struct sprd_dma_dev *sdev = to_sprd_dma_dev(chan); 753 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); 754 enum sprd_dma_chn_mode chn_mode = schan->chn_mode; 755 u32 req_mode = (flags >> SPRD_DMA_REQ_SHIFT) & SPRD_DMA_REQ_MODE_MASK; 756 u32 int_mode = flags & SPRD_DMA_INT_MASK; 757 int src_datawidth, dst_datawidth, src_step, dst_step; 758 u32 temp, fix_mode = 0, fix_en = 0; 759 phys_addr_t llist_ptr; 760 761 if (dir == DMA_MEM_TO_DEV) { 762 src_step = sprd_dma_get_step(slave_cfg->src_addr_width); 763 if (src_step < 0) { 764 dev_err(sdev->dma_dev.dev, "invalid source step\n"); 765 return src_step; 766 } 767 768 /* 769 * For 2-stage transfer, destination channel step can not be 0, 770 * since destination device is AON IRAM. 771 */ 772 if (chn_mode == SPRD_DMA_DST_CHN0 || 773 chn_mode == SPRD_DMA_DST_CHN1) 774 dst_step = src_step; 775 else 776 dst_step = SPRD_DMA_NONE_STEP; 777 } else { 778 dst_step = sprd_dma_get_step(slave_cfg->dst_addr_width); 779 if (dst_step < 0) { 780 dev_err(sdev->dma_dev.dev, "invalid destination step\n"); 781 return dst_step; 782 } 783 src_step = SPRD_DMA_NONE_STEP; 784 } 785 786 src_datawidth = sprd_dma_get_datawidth(slave_cfg->src_addr_width); 787 if (src_datawidth < 0) { 788 dev_err(sdev->dma_dev.dev, "invalid source datawidth\n"); 789 return src_datawidth; 790 } 791 792 dst_datawidth = sprd_dma_get_datawidth(slave_cfg->dst_addr_width); 793 if (dst_datawidth < 0) { 794 dev_err(sdev->dma_dev.dev, "invalid destination datawidth\n"); 795 return dst_datawidth; 796 } 797 798 if (slave_cfg->slave_id) 799 schan->dev_id = slave_cfg->slave_id; 800 801 hw->cfg = SPRD_DMA_DONOT_WAIT_BDONE << SPRD_DMA_WAIT_BDONE_OFFSET; 802 803 /* 804 * wrap_ptr and wrap_to will save the high 4 bits source address and 805 * destination address. 806 */ 807 hw->wrap_ptr = (src >> SPRD_DMA_HIGH_ADDR_OFFSET) & SPRD_DMA_HIGH_ADDR_MASK; 808 hw->wrap_to = (dst >> SPRD_DMA_HIGH_ADDR_OFFSET) & SPRD_DMA_HIGH_ADDR_MASK; 809 hw->src_addr = src & SPRD_DMA_LOW_ADDR_MASK; 810 hw->des_addr = dst & SPRD_DMA_LOW_ADDR_MASK; 811 812 /* 813 * If the src step and dst step both are 0 or both are not 0, that means 814 * we can not enable the fix mode. If one is 0 and another one is not, 815 * we can enable the fix mode. 816 */ 817 if ((src_step != 0 && dst_step != 0) || (src_step | dst_step) == 0) { 818 fix_en = 0; 819 } else { 820 fix_en = 1; 821 if (src_step) 822 fix_mode = 1; 823 else 824 fix_mode = 0; 825 } 826 827 hw->intc = int_mode | SPRD_DMA_CFG_ERR_INT_EN; 828 829 temp = src_datawidth << SPRD_DMA_SRC_DATAWIDTH_OFFSET; 830 temp |= dst_datawidth << SPRD_DMA_DES_DATAWIDTH_OFFSET; 831 temp |= req_mode << SPRD_DMA_REQ_MODE_OFFSET; 832 temp |= fix_mode << SPRD_DMA_FIX_SEL_OFFSET; 833 temp |= fix_en << SPRD_DMA_FIX_EN_OFFSET; 834 temp |= schan->linklist.wrap_addr ? 835 SPRD_DMA_WRAP_EN | SPRD_DMA_WRAP_SEL_DEST : 0; 836 temp |= slave_cfg->src_maxburst & SPRD_DMA_FRG_LEN_MASK; 837 hw->frg_len = temp; 838 839 hw->blk_len = slave_cfg->src_maxburst & SPRD_DMA_BLK_LEN_MASK; 840 hw->trsc_len = len & SPRD_DMA_TRSC_LEN_MASK; 841 842 temp = (dst_step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_DEST_TRSF_STEP_OFFSET; 843 temp |= (src_step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_SRC_TRSF_STEP_OFFSET; 844 hw->trsf_step = temp; 845 846 /* link-list configuration */ 847 if (schan->linklist.phy_addr) { 848 hw->cfg |= SPRD_DMA_LINKLIST_EN; 849 850 /* link-list index */ 851 temp = sglen ? (sg_index + 1) % sglen : 0; 852 853 /* Next link-list configuration's physical address offset */ 854 temp = temp * sizeof(*hw) + SPRD_DMA_CHN_SRC_ADDR; 855 /* 856 * Set the link-list pointer point to next link-list 857 * configuration's physical address. 858 */ 859 llist_ptr = schan->linklist.phy_addr + temp; 860 hw->llist_ptr = lower_32_bits(llist_ptr); 861 hw->src_blk_step = (upper_32_bits(llist_ptr) << SPRD_DMA_LLIST_HIGH_SHIFT) & 862 SPRD_DMA_LLIST_HIGH_MASK; 863 864 if (schan->linklist.wrap_addr) { 865 hw->wrap_ptr |= schan->linklist.wrap_addr & 866 SPRD_DMA_WRAP_ADDR_MASK; 867 hw->wrap_to |= dst & SPRD_DMA_WRAP_ADDR_MASK; 868 } 869 } else { 870 hw->llist_ptr = 0; 871 hw->src_blk_step = 0; 872 } 873 874 hw->frg_step = 0; 875 hw->des_blk_step = 0; 876 return 0; 877 } 878 879 static int sprd_dma_fill_linklist_desc(struct dma_chan *chan, 880 unsigned int sglen, int sg_index, 881 dma_addr_t src, dma_addr_t dst, u32 len, 882 enum dma_transfer_direction dir, 883 unsigned long flags, 884 struct dma_slave_config *slave_cfg) 885 { 886 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); 887 struct sprd_dma_chn_hw *hw; 888 889 if (!schan->linklist.virt_addr) 890 return -EINVAL; 891 892 hw = (struct sprd_dma_chn_hw *)(schan->linklist.virt_addr + 893 sg_index * sizeof(*hw)); 894 895 return sprd_dma_fill_desc(chan, hw, sglen, sg_index, src, dst, len, 896 dir, flags, slave_cfg); 897 } 898 899 static struct dma_async_tx_descriptor * 900 sprd_dma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, 901 size_t len, unsigned long flags) 902 { 903 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); 904 struct sprd_dma_desc *sdesc; 905 struct sprd_dma_chn_hw *hw; 906 enum sprd_dma_datawidth datawidth; 907 u32 step, temp; 908 909 sdesc = kzalloc(sizeof(*sdesc), GFP_NOWAIT); 910 if (!sdesc) 911 return NULL; 912 913 hw = &sdesc->chn_hw; 914 915 hw->cfg = SPRD_DMA_DONOT_WAIT_BDONE << SPRD_DMA_WAIT_BDONE_OFFSET; 916 hw->intc = SPRD_DMA_TRANS_INT | SPRD_DMA_CFG_ERR_INT_EN; 917 hw->src_addr = src & SPRD_DMA_LOW_ADDR_MASK; 918 hw->des_addr = dest & SPRD_DMA_LOW_ADDR_MASK; 919 hw->wrap_ptr = (src >> SPRD_DMA_HIGH_ADDR_OFFSET) & 920 SPRD_DMA_HIGH_ADDR_MASK; 921 hw->wrap_to = (dest >> SPRD_DMA_HIGH_ADDR_OFFSET) & 922 SPRD_DMA_HIGH_ADDR_MASK; 923 924 if (IS_ALIGNED(len, 8)) { 925 datawidth = SPRD_DMA_DATAWIDTH_8_BYTES; 926 step = SPRD_DMA_DWORD_STEP; 927 } else if (IS_ALIGNED(len, 4)) { 928 datawidth = SPRD_DMA_DATAWIDTH_4_BYTES; 929 step = SPRD_DMA_WORD_STEP; 930 } else if (IS_ALIGNED(len, 2)) { 931 datawidth = SPRD_DMA_DATAWIDTH_2_BYTES; 932 step = SPRD_DMA_SHORT_STEP; 933 } else { 934 datawidth = SPRD_DMA_DATAWIDTH_1_BYTE; 935 step = SPRD_DMA_BYTE_STEP; 936 } 937 938 temp = datawidth << SPRD_DMA_SRC_DATAWIDTH_OFFSET; 939 temp |= datawidth << SPRD_DMA_DES_DATAWIDTH_OFFSET; 940 temp |= SPRD_DMA_TRANS_REQ << SPRD_DMA_REQ_MODE_OFFSET; 941 temp |= len & SPRD_DMA_FRG_LEN_MASK; 942 hw->frg_len = temp; 943 944 hw->blk_len = len & SPRD_DMA_BLK_LEN_MASK; 945 hw->trsc_len = len & SPRD_DMA_TRSC_LEN_MASK; 946 947 temp = (step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_DEST_TRSF_STEP_OFFSET; 948 temp |= (step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_SRC_TRSF_STEP_OFFSET; 949 hw->trsf_step = temp; 950 951 return vchan_tx_prep(&schan->vc, &sdesc->vd, flags); 952 } 953 954 static struct dma_async_tx_descriptor * 955 sprd_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, 956 unsigned int sglen, enum dma_transfer_direction dir, 957 unsigned long flags, void *context) 958 { 959 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); 960 struct dma_slave_config *slave_cfg = &schan->slave_cfg; 961 dma_addr_t src = 0, dst = 0; 962 dma_addr_t start_src = 0, start_dst = 0; 963 struct sprd_dma_desc *sdesc; 964 struct scatterlist *sg; 965 u32 len = 0; 966 int ret, i; 967 968 if (!is_slave_direction(dir)) 969 return NULL; 970 971 if (context) { 972 struct sprd_dma_linklist *ll_cfg = 973 (struct sprd_dma_linklist *)context; 974 975 schan->linklist.phy_addr = ll_cfg->phy_addr; 976 schan->linklist.virt_addr = ll_cfg->virt_addr; 977 schan->linklist.wrap_addr = ll_cfg->wrap_addr; 978 } else { 979 schan->linklist.phy_addr = 0; 980 schan->linklist.virt_addr = 0; 981 schan->linklist.wrap_addr = 0; 982 } 983 984 /* 985 * Set channel mode, interrupt mode and trigger mode for 2-stage 986 * transfer. 987 */ 988 schan->chn_mode = 989 (flags >> SPRD_DMA_CHN_MODE_SHIFT) & SPRD_DMA_CHN_MODE_MASK; 990 schan->trg_mode = 991 (flags >> SPRD_DMA_TRG_MODE_SHIFT) & SPRD_DMA_TRG_MODE_MASK; 992 schan->int_type = flags & SPRD_DMA_INT_TYPE_MASK; 993 994 sdesc = kzalloc(sizeof(*sdesc), GFP_NOWAIT); 995 if (!sdesc) 996 return NULL; 997 998 sdesc->dir = dir; 999 1000 for_each_sg(sgl, sg, sglen, i) { 1001 len = sg_dma_len(sg); 1002 1003 if (dir == DMA_MEM_TO_DEV) { 1004 src = sg_dma_address(sg); 1005 dst = slave_cfg->dst_addr; 1006 } else { 1007 src = slave_cfg->src_addr; 1008 dst = sg_dma_address(sg); 1009 } 1010 1011 if (!i) { 1012 start_src = src; 1013 start_dst = dst; 1014 } 1015 1016 /* 1017 * The link-list mode needs at least 2 link-list 1018 * configurations. If there is only one sg, it doesn't 1019 * need to fill the link-list configuration. 1020 */ 1021 if (sglen < 2) 1022 break; 1023 1024 ret = sprd_dma_fill_linklist_desc(chan, sglen, i, src, dst, len, 1025 dir, flags, slave_cfg); 1026 if (ret) { 1027 kfree(sdesc); 1028 return NULL; 1029 } 1030 } 1031 1032 ret = sprd_dma_fill_desc(chan, &sdesc->chn_hw, 0, 0, start_src, 1033 start_dst, len, dir, flags, slave_cfg); 1034 if (ret) { 1035 kfree(sdesc); 1036 return NULL; 1037 } 1038 1039 return vchan_tx_prep(&schan->vc, &sdesc->vd, flags); 1040 } 1041 1042 static int sprd_dma_slave_config(struct dma_chan *chan, 1043 struct dma_slave_config *config) 1044 { 1045 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); 1046 struct dma_slave_config *slave_cfg = &schan->slave_cfg; 1047 1048 memcpy(slave_cfg, config, sizeof(*config)); 1049 return 0; 1050 } 1051 1052 static int sprd_dma_pause(struct dma_chan *chan) 1053 { 1054 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); 1055 unsigned long flags; 1056 1057 spin_lock_irqsave(&schan->vc.lock, flags); 1058 sprd_dma_pause_resume(schan, true); 1059 spin_unlock_irqrestore(&schan->vc.lock, flags); 1060 1061 return 0; 1062 } 1063 1064 static int sprd_dma_resume(struct dma_chan *chan) 1065 { 1066 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); 1067 unsigned long flags; 1068 1069 spin_lock_irqsave(&schan->vc.lock, flags); 1070 sprd_dma_pause_resume(schan, false); 1071 spin_unlock_irqrestore(&schan->vc.lock, flags); 1072 1073 return 0; 1074 } 1075 1076 static int sprd_dma_terminate_all(struct dma_chan *chan) 1077 { 1078 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); 1079 struct virt_dma_desc *cur_vd = NULL; 1080 unsigned long flags; 1081 LIST_HEAD(head); 1082 1083 spin_lock_irqsave(&schan->vc.lock, flags); 1084 if (schan->cur_desc) 1085 cur_vd = &schan->cur_desc->vd; 1086 1087 sprd_dma_stop(schan); 1088 1089 vchan_get_all_descriptors(&schan->vc, &head); 1090 spin_unlock_irqrestore(&schan->vc.lock, flags); 1091 1092 if (cur_vd) 1093 sprd_dma_free_desc(cur_vd); 1094 1095 vchan_dma_desc_free_list(&schan->vc, &head); 1096 return 0; 1097 } 1098 1099 static void sprd_dma_free_desc(struct virt_dma_desc *vd) 1100 { 1101 struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd); 1102 1103 kfree(sdesc); 1104 } 1105 1106 static bool sprd_dma_filter_fn(struct dma_chan *chan, void *param) 1107 { 1108 struct sprd_dma_chn *schan = to_sprd_dma_chan(chan); 1109 u32 slave_id = *(u32 *)param; 1110 1111 schan->dev_id = slave_id; 1112 return true; 1113 } 1114 1115 static int sprd_dma_probe(struct platform_device *pdev) 1116 { 1117 struct device_node *np = pdev->dev.of_node; 1118 struct sprd_dma_dev *sdev; 1119 struct sprd_dma_chn *dma_chn; 1120 u32 chn_count; 1121 int ret, i; 1122 1123 ret = device_property_read_u32(&pdev->dev, "#dma-channels", &chn_count); 1124 if (ret) { 1125 dev_err(&pdev->dev, "get dma channels count failed\n"); 1126 return ret; 1127 } 1128 1129 sdev = devm_kzalloc(&pdev->dev, 1130 struct_size(sdev, channels, chn_count), 1131 GFP_KERNEL); 1132 if (!sdev) 1133 return -ENOMEM; 1134 1135 sdev->clk = devm_clk_get(&pdev->dev, "enable"); 1136 if (IS_ERR(sdev->clk)) { 1137 dev_err(&pdev->dev, "get enable clock failed\n"); 1138 return PTR_ERR(sdev->clk); 1139 } 1140 1141 /* ashb clock is optional for AGCP DMA */ 1142 sdev->ashb_clk = devm_clk_get(&pdev->dev, "ashb_eb"); 1143 if (IS_ERR(sdev->ashb_clk)) 1144 dev_warn(&pdev->dev, "no optional ashb eb clock\n"); 1145 1146 /* 1147 * We have three DMA controllers: AP DMA, AON DMA and AGCP DMA. For AGCP 1148 * DMA controller, it can or do not request the irq, which will save 1149 * system power without resuming system by DMA interrupts if AGCP DMA 1150 * does not request the irq. Thus the DMA interrupts property should 1151 * be optional. 1152 */ 1153 sdev->irq = platform_get_irq(pdev, 0); 1154 if (sdev->irq > 0) { 1155 ret = devm_request_irq(&pdev->dev, sdev->irq, dma_irq_handle, 1156 0, "sprd_dma", (void *)sdev); 1157 if (ret < 0) { 1158 dev_err(&pdev->dev, "request dma irq failed\n"); 1159 return ret; 1160 } 1161 } else { 1162 dev_warn(&pdev->dev, "no interrupts for the dma controller\n"); 1163 } 1164 1165 sdev->glb_base = devm_platform_ioremap_resource(pdev, 0); 1166 if (IS_ERR(sdev->glb_base)) 1167 return PTR_ERR(sdev->glb_base); 1168 1169 dma_cap_set(DMA_MEMCPY, sdev->dma_dev.cap_mask); 1170 sdev->total_chns = chn_count; 1171 sdev->dma_dev.chancnt = chn_count; 1172 INIT_LIST_HEAD(&sdev->dma_dev.channels); 1173 INIT_LIST_HEAD(&sdev->dma_dev.global_node); 1174 sdev->dma_dev.dev = &pdev->dev; 1175 sdev->dma_dev.device_alloc_chan_resources = sprd_dma_alloc_chan_resources; 1176 sdev->dma_dev.device_free_chan_resources = sprd_dma_free_chan_resources; 1177 sdev->dma_dev.device_tx_status = sprd_dma_tx_status; 1178 sdev->dma_dev.device_issue_pending = sprd_dma_issue_pending; 1179 sdev->dma_dev.device_prep_dma_memcpy = sprd_dma_prep_dma_memcpy; 1180 sdev->dma_dev.device_prep_slave_sg = sprd_dma_prep_slave_sg; 1181 sdev->dma_dev.device_config = sprd_dma_slave_config; 1182 sdev->dma_dev.device_pause = sprd_dma_pause; 1183 sdev->dma_dev.device_resume = sprd_dma_resume; 1184 sdev->dma_dev.device_terminate_all = sprd_dma_terminate_all; 1185 1186 for (i = 0; i < chn_count; i++) { 1187 dma_chn = &sdev->channels[i]; 1188 dma_chn->chn_num = i; 1189 dma_chn->cur_desc = NULL; 1190 /* get each channel's registers base address. */ 1191 dma_chn->chn_base = sdev->glb_base + SPRD_DMA_CHN_REG_OFFSET + 1192 SPRD_DMA_CHN_REG_LENGTH * i; 1193 1194 dma_chn->vc.desc_free = sprd_dma_free_desc; 1195 vchan_init(&dma_chn->vc, &sdev->dma_dev); 1196 } 1197 1198 platform_set_drvdata(pdev, sdev); 1199 ret = sprd_dma_enable(sdev); 1200 if (ret) 1201 return ret; 1202 1203 pm_runtime_set_active(&pdev->dev); 1204 pm_runtime_enable(&pdev->dev); 1205 1206 ret = pm_runtime_get_sync(&pdev->dev); 1207 if (ret < 0) 1208 goto err_rpm; 1209 1210 ret = dma_async_device_register(&sdev->dma_dev); 1211 if (ret < 0) { 1212 dev_err(&pdev->dev, "register dma device failed:%d\n", ret); 1213 goto err_register; 1214 } 1215 1216 sprd_dma_info.dma_cap = sdev->dma_dev.cap_mask; 1217 ret = of_dma_controller_register(np, of_dma_simple_xlate, 1218 &sprd_dma_info); 1219 if (ret) 1220 goto err_of_register; 1221 1222 pm_runtime_put(&pdev->dev); 1223 return 0; 1224 1225 err_of_register: 1226 dma_async_device_unregister(&sdev->dma_dev); 1227 err_register: 1228 pm_runtime_put_noidle(&pdev->dev); 1229 pm_runtime_disable(&pdev->dev); 1230 err_rpm: 1231 sprd_dma_disable(sdev); 1232 return ret; 1233 } 1234 1235 static int sprd_dma_remove(struct platform_device *pdev) 1236 { 1237 struct sprd_dma_dev *sdev = platform_get_drvdata(pdev); 1238 struct sprd_dma_chn *c, *cn; 1239 int ret; 1240 1241 ret = pm_runtime_get_sync(&pdev->dev); 1242 if (ret < 0) 1243 return ret; 1244 1245 /* explicitly free the irq */ 1246 if (sdev->irq > 0) 1247 devm_free_irq(&pdev->dev, sdev->irq, sdev); 1248 1249 list_for_each_entry_safe(c, cn, &sdev->dma_dev.channels, 1250 vc.chan.device_node) { 1251 list_del(&c->vc.chan.device_node); 1252 tasklet_kill(&c->vc.task); 1253 } 1254 1255 of_dma_controller_free(pdev->dev.of_node); 1256 dma_async_device_unregister(&sdev->dma_dev); 1257 sprd_dma_disable(sdev); 1258 1259 pm_runtime_put_noidle(&pdev->dev); 1260 pm_runtime_disable(&pdev->dev); 1261 return 0; 1262 } 1263 1264 static const struct of_device_id sprd_dma_match[] = { 1265 { .compatible = "sprd,sc9860-dma", }, 1266 {}, 1267 }; 1268 1269 static int __maybe_unused sprd_dma_runtime_suspend(struct device *dev) 1270 { 1271 struct sprd_dma_dev *sdev = dev_get_drvdata(dev); 1272 1273 sprd_dma_disable(sdev); 1274 return 0; 1275 } 1276 1277 static int __maybe_unused sprd_dma_runtime_resume(struct device *dev) 1278 { 1279 struct sprd_dma_dev *sdev = dev_get_drvdata(dev); 1280 int ret; 1281 1282 ret = sprd_dma_enable(sdev); 1283 if (ret) 1284 dev_err(sdev->dma_dev.dev, "enable dma failed\n"); 1285 1286 return ret; 1287 } 1288 1289 static const struct dev_pm_ops sprd_dma_pm_ops = { 1290 SET_RUNTIME_PM_OPS(sprd_dma_runtime_suspend, 1291 sprd_dma_runtime_resume, 1292 NULL) 1293 }; 1294 1295 static struct platform_driver sprd_dma_driver = { 1296 .probe = sprd_dma_probe, 1297 .remove = sprd_dma_remove, 1298 .driver = { 1299 .name = "sprd-dma", 1300 .of_match_table = sprd_dma_match, 1301 .pm = &sprd_dma_pm_ops, 1302 }, 1303 }; 1304 module_platform_driver(sprd_dma_driver); 1305 1306 MODULE_LICENSE("GPL v2"); 1307 MODULE_DESCRIPTION("DMA driver for Spreadtrum"); 1308 MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>"); 1309 MODULE_AUTHOR("Eric Long <eric.long@spreadtrum.com>"); 1310 MODULE_ALIAS("platform:sprd-dma"); 1311