1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2015-2016 Marvell International Ltd. 4 5 */ 6 7 #include <linux/clk.h> 8 #include <linux/dma-mapping.h> 9 #include <linux/interrupt.h> 10 #include <linux/io.h> 11 #include <linux/module.h> 12 #include <linux/msi.h> 13 #include <linux/of.h> 14 #include <linux/of_irq.h> 15 #include <linux/platform_device.h> 16 #include <linux/spinlock.h> 17 18 #include "dmaengine.h" 19 20 /* DMA Engine Registers */ 21 #define MV_XOR_V2_DMA_DESQ_BALR_OFF 0x000 22 #define MV_XOR_V2_DMA_DESQ_BAHR_OFF 0x004 23 #define MV_XOR_V2_DMA_DESQ_SIZE_OFF 0x008 24 #define MV_XOR_V2_DMA_DESQ_DONE_OFF 0x00C 25 #define MV_XOR_V2_DMA_DESQ_DONE_PENDING_MASK 0x7FFF 26 #define MV_XOR_V2_DMA_DESQ_DONE_PENDING_SHIFT 0 27 #define MV_XOR_V2_DMA_DESQ_DONE_READ_PTR_MASK 0x1FFF 28 #define MV_XOR_V2_DMA_DESQ_DONE_READ_PTR_SHIFT 16 29 #define MV_XOR_V2_DMA_DESQ_ARATTR_OFF 0x010 30 #define MV_XOR_V2_DMA_DESQ_ATTR_CACHE_MASK 0x3F3F 31 #define MV_XOR_V2_DMA_DESQ_ATTR_OUTER_SHAREABLE 0x202 32 #define MV_XOR_V2_DMA_DESQ_ATTR_CACHEABLE 0x3C3C 33 #define MV_XOR_V2_DMA_IMSG_CDAT_OFF 0x014 34 #define MV_XOR_V2_DMA_IMSG_THRD_OFF 0x018 35 #define MV_XOR_V2_DMA_IMSG_THRD_MASK 0x7FFF 36 #define MV_XOR_V2_DMA_IMSG_TIMER_EN BIT(18) 37 #define MV_XOR_V2_DMA_DESQ_AWATTR_OFF 0x01C 38 /* Same flags as MV_XOR_V2_DMA_DESQ_ARATTR_OFF */ 39 #define MV_XOR_V2_DMA_DESQ_ALLOC_OFF 0x04C 40 #define MV_XOR_V2_DMA_DESQ_ALLOC_WRPTR_MASK 0xFFFF 41 #define MV_XOR_V2_DMA_DESQ_ALLOC_WRPTR_SHIFT 16 42 #define MV_XOR_V2_DMA_IMSG_BALR_OFF 0x050 43 #define MV_XOR_V2_DMA_IMSG_BAHR_OFF 0x054 44 #define MV_XOR_V2_DMA_DESQ_CTRL_OFF 0x100 45 #define MV_XOR_V2_DMA_DESQ_CTRL_32B 1 46 #define MV_XOR_V2_DMA_DESQ_CTRL_128B 7 47 #define MV_XOR_V2_DMA_DESQ_STOP_OFF 0x800 48 #define MV_XOR_V2_DMA_DESQ_DEALLOC_OFF 0x804 49 #define MV_XOR_V2_DMA_DESQ_ADD_OFF 0x808 50 #define MV_XOR_V2_DMA_IMSG_TMOT 0x810 51 #define MV_XOR_V2_DMA_IMSG_TIMER_THRD_MASK 0x1FFF 52 53 /* XOR Global registers */ 54 #define MV_XOR_V2_GLOB_BW_CTRL 0x4 55 #define MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_RD_SHIFT 0 56 #define MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_RD_VAL 64 57 #define MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_WR_SHIFT 8 58 #define MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_WR_VAL 8 59 #define MV_XOR_V2_GLOB_BW_CTRL_RD_BURST_LEN_SHIFT 12 60 #define MV_XOR_V2_GLOB_BW_CTRL_RD_BURST_LEN_VAL 4 61 #define MV_XOR_V2_GLOB_BW_CTRL_WR_BURST_LEN_SHIFT 16 62 #define MV_XOR_V2_GLOB_BW_CTRL_WR_BURST_LEN_VAL 4 63 #define MV_XOR_V2_GLOB_PAUSE 0x014 64 #define MV_XOR_V2_GLOB_PAUSE_AXI_TIME_DIS_VAL 0x8 65 #define MV_XOR_V2_GLOB_SYS_INT_CAUSE 0x200 66 #define MV_XOR_V2_GLOB_SYS_INT_MASK 0x204 67 #define MV_XOR_V2_GLOB_MEM_INT_CAUSE 0x220 68 #define MV_XOR_V2_GLOB_MEM_INT_MASK 0x224 69 70 #define MV_XOR_V2_MIN_DESC_SIZE 32 71 #define MV_XOR_V2_EXT_DESC_SIZE 128 72 73 #define MV_XOR_V2_DESC_RESERVED_SIZE 12 74 #define MV_XOR_V2_DESC_BUFF_D_ADDR_SIZE 12 75 76 #define MV_XOR_V2_CMD_LINE_NUM_MAX_D_BUF 8 77 78 /* 79 * Descriptors queue size. With 32 bytes descriptors, up to 2^14 80 * descriptors are allowed, with 128 bytes descriptors, up to 2^12 81 * descriptors are allowed. This driver uses 128 bytes descriptors, 82 * but experimentation has shown that a set of 1024 descriptors is 83 * sufficient to reach a good level of performance. 84 */ 85 #define MV_XOR_V2_DESC_NUM 1024 86 87 /* 88 * Threshold values for descriptors and timeout, determined by 89 * experimentation as giving a good level of performance. 90 */ 91 #define MV_XOR_V2_DONE_IMSG_THRD 0x14 92 #define MV_XOR_V2_TIMER_THRD 0xB0 93 94 /** 95 * struct mv_xor_v2_descriptor - DMA HW descriptor 96 * @desc_id: used by S/W and is not affected by H/W. 97 * @flags: error and status flags 98 * @crc32_result: CRC32 calculation result 99 * @desc_ctrl: operation mode and control flags 100 * @buff_size: amount of bytes to be processed 101 * @fill_pattern_src_addr: Fill-Pattern or Source-Address and 102 * AW-Attributes 103 * @data_buff_addr: Source (and might be RAID6 destination) 104 * addresses of data buffers in RAID5 and RAID6 105 * @reserved: reserved 106 */ 107 struct mv_xor_v2_descriptor { 108 u16 desc_id; 109 u16 flags; 110 u32 crc32_result; 111 u32 desc_ctrl; 112 113 /* Definitions for desc_ctrl */ 114 #define DESC_NUM_ACTIVE_D_BUF_SHIFT 22 115 #define DESC_OP_MODE_SHIFT 28 116 #define DESC_OP_MODE_NOP 0 /* Idle operation */ 117 #define DESC_OP_MODE_MEMCPY 1 /* Pure-DMA operation */ 118 #define DESC_OP_MODE_MEMSET 2 /* Mem-Fill operation */ 119 #define DESC_OP_MODE_MEMINIT 3 /* Mem-Init operation */ 120 #define DESC_OP_MODE_MEM_COMPARE 4 /* Mem-Compare operation */ 121 #define DESC_OP_MODE_CRC32 5 /* CRC32 calculation */ 122 #define DESC_OP_MODE_XOR 6 /* RAID5 (XOR) operation */ 123 #define DESC_OP_MODE_RAID6 7 /* RAID6 P&Q-generation */ 124 #define DESC_OP_MODE_RAID6_REC 8 /* RAID6 Recovery */ 125 #define DESC_Q_BUFFER_ENABLE BIT(16) 126 #define DESC_P_BUFFER_ENABLE BIT(17) 127 #define DESC_IOD BIT(27) 128 129 u32 buff_size; 130 u32 fill_pattern_src_addr[4]; 131 u32 data_buff_addr[MV_XOR_V2_DESC_BUFF_D_ADDR_SIZE]; 132 u32 reserved[MV_XOR_V2_DESC_RESERVED_SIZE]; 133 }; 134 135 /** 136 * struct mv_xor_v2_device - implements a xor device 137 * @lock: lock for the engine 138 * @clk: reference to the 'core' clock 139 * @reg_clk: reference to the 'reg' clock 140 * @dma_base: memory mapped DMA register base 141 * @glob_base: memory mapped global register base 142 * @irq_tasklet: tasklet used for IRQ handling call-backs 143 * @free_sw_desc: linked list of free SW descriptors 144 * @dmadev: dma device 145 * @dmachan: dma channel 146 * @hw_desq: HW descriptors queue 147 * @hw_desq_virt: virtual address of DESCQ 148 * @sw_desq: SW descriptors queue 149 * @desc_size: HW descriptor size 150 * @npendings: number of pending descriptors (for which tx_submit has 151 * @hw_queue_idx: HW queue index 152 * @irq: The Linux interrupt number 153 * been called, but not yet issue_pending) 154 */ 155 struct mv_xor_v2_device { 156 spinlock_t lock; 157 void __iomem *dma_base; 158 void __iomem *glob_base; 159 struct clk *clk; 160 struct clk *reg_clk; 161 struct tasklet_struct irq_tasklet; 162 struct list_head free_sw_desc; 163 struct dma_device dmadev; 164 struct dma_chan dmachan; 165 dma_addr_t hw_desq; 166 struct mv_xor_v2_descriptor *hw_desq_virt; 167 struct mv_xor_v2_sw_desc *sw_desq; 168 int desc_size; 169 unsigned int npendings; 170 unsigned int hw_queue_idx; 171 unsigned int irq; 172 }; 173 174 /** 175 * struct mv_xor_v2_sw_desc - implements a xor SW descriptor 176 * @idx: descriptor index 177 * @async_tx: support for the async_tx api 178 * @hw_desc: assosiated HW descriptor 179 * @free_list: node of the free SW descriprots list 180 */ 181 struct mv_xor_v2_sw_desc { 182 int idx; 183 struct dma_async_tx_descriptor async_tx; 184 struct mv_xor_v2_descriptor hw_desc; 185 struct list_head free_list; 186 }; 187 188 /* 189 * Fill the data buffers to a HW descriptor 190 */ 191 static void mv_xor_v2_set_data_buffers(struct mv_xor_v2_device *xor_dev, 192 struct mv_xor_v2_descriptor *desc, 193 dma_addr_t src, int index) 194 { 195 int arr_index = ((index >> 1) * 3); 196 197 /* 198 * Fill the buffer's addresses to the descriptor. 199 * 200 * The format of the buffers address for 2 sequential buffers 201 * X and X + 1: 202 * 203 * First word: Buffer-DX-Address-Low[31:0] 204 * Second word: Buffer-DX+1-Address-Low[31:0] 205 * Third word: DX+1-Buffer-Address-High[47:32] [31:16] 206 * DX-Buffer-Address-High[47:32] [15:0] 207 */ 208 if ((index & 0x1) == 0) { 209 desc->data_buff_addr[arr_index] = lower_32_bits(src); 210 211 desc->data_buff_addr[arr_index + 2] &= ~0xFFFF; 212 desc->data_buff_addr[arr_index + 2] |= 213 upper_32_bits(src) & 0xFFFF; 214 } else { 215 desc->data_buff_addr[arr_index + 1] = 216 lower_32_bits(src); 217 218 desc->data_buff_addr[arr_index + 2] &= ~0xFFFF0000; 219 desc->data_buff_addr[arr_index + 2] |= 220 (upper_32_bits(src) & 0xFFFF) << 16; 221 } 222 } 223 224 /* 225 * notify the engine of new descriptors, and update the available index. 226 */ 227 static void mv_xor_v2_add_desc_to_desq(struct mv_xor_v2_device *xor_dev, 228 int num_of_desc) 229 { 230 /* write the number of new descriptors in the DESQ. */ 231 writel(num_of_desc, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_ADD_OFF); 232 } 233 234 /* 235 * free HW descriptors 236 */ 237 static void mv_xor_v2_free_desc_from_desq(struct mv_xor_v2_device *xor_dev, 238 int num_of_desc) 239 { 240 /* write the number of new descriptors in the DESQ. */ 241 writel(num_of_desc, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_DEALLOC_OFF); 242 } 243 244 /* 245 * Set descriptor size 246 * Return the HW descriptor size in bytes 247 */ 248 static int mv_xor_v2_set_desc_size(struct mv_xor_v2_device *xor_dev) 249 { 250 writel(MV_XOR_V2_DMA_DESQ_CTRL_128B, 251 xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_CTRL_OFF); 252 253 return MV_XOR_V2_EXT_DESC_SIZE; 254 } 255 256 /* 257 * Set the IMSG threshold 258 */ 259 static inline 260 void mv_xor_v2_enable_imsg_thrd(struct mv_xor_v2_device *xor_dev) 261 { 262 u32 reg; 263 264 /* Configure threshold of number of descriptors, and enable timer */ 265 reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_THRD_OFF); 266 reg &= ~MV_XOR_V2_DMA_IMSG_THRD_MASK; 267 reg |= MV_XOR_V2_DONE_IMSG_THRD; 268 reg |= MV_XOR_V2_DMA_IMSG_TIMER_EN; 269 writel(reg, xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_THRD_OFF); 270 271 /* Configure Timer Threshold */ 272 reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_TMOT); 273 reg &= ~MV_XOR_V2_DMA_IMSG_TIMER_THRD_MASK; 274 reg |= MV_XOR_V2_TIMER_THRD; 275 writel(reg, xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_TMOT); 276 } 277 278 static irqreturn_t mv_xor_v2_interrupt_handler(int irq, void *data) 279 { 280 struct mv_xor_v2_device *xor_dev = data; 281 unsigned int ndescs; 282 u32 reg; 283 284 reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_DONE_OFF); 285 286 ndescs = ((reg >> MV_XOR_V2_DMA_DESQ_DONE_PENDING_SHIFT) & 287 MV_XOR_V2_DMA_DESQ_DONE_PENDING_MASK); 288 289 /* No descriptors to process */ 290 if (!ndescs) 291 return IRQ_NONE; 292 293 /* schedule a tasklet to handle descriptors callbacks */ 294 tasklet_schedule(&xor_dev->irq_tasklet); 295 296 return IRQ_HANDLED; 297 } 298 299 /* 300 * submit a descriptor to the DMA engine 301 */ 302 static dma_cookie_t 303 mv_xor_v2_tx_submit(struct dma_async_tx_descriptor *tx) 304 { 305 void *dest_hw_desc; 306 dma_cookie_t cookie; 307 struct mv_xor_v2_sw_desc *sw_desc = 308 container_of(tx, struct mv_xor_v2_sw_desc, async_tx); 309 struct mv_xor_v2_device *xor_dev = 310 container_of(tx->chan, struct mv_xor_v2_device, dmachan); 311 312 dev_dbg(xor_dev->dmadev.dev, 313 "%s sw_desc %p: async_tx %p\n", 314 __func__, sw_desc, &sw_desc->async_tx); 315 316 /* assign cookie */ 317 spin_lock_bh(&xor_dev->lock); 318 cookie = dma_cookie_assign(tx); 319 320 /* copy the HW descriptor from the SW descriptor to the DESQ */ 321 dest_hw_desc = xor_dev->hw_desq_virt + xor_dev->hw_queue_idx; 322 323 memcpy(dest_hw_desc, &sw_desc->hw_desc, xor_dev->desc_size); 324 325 xor_dev->npendings++; 326 xor_dev->hw_queue_idx++; 327 if (xor_dev->hw_queue_idx >= MV_XOR_V2_DESC_NUM) 328 xor_dev->hw_queue_idx = 0; 329 330 spin_unlock_bh(&xor_dev->lock); 331 332 return cookie; 333 } 334 335 /* 336 * Prepare a SW descriptor 337 */ 338 static struct mv_xor_v2_sw_desc * 339 mv_xor_v2_prep_sw_desc(struct mv_xor_v2_device *xor_dev) 340 { 341 struct mv_xor_v2_sw_desc *sw_desc; 342 bool found = false; 343 344 /* Lock the channel */ 345 spin_lock_bh(&xor_dev->lock); 346 347 if (list_empty(&xor_dev->free_sw_desc)) { 348 spin_unlock_bh(&xor_dev->lock); 349 /* schedule tasklet to free some descriptors */ 350 tasklet_schedule(&xor_dev->irq_tasklet); 351 return NULL; 352 } 353 354 list_for_each_entry(sw_desc, &xor_dev->free_sw_desc, free_list) { 355 if (async_tx_test_ack(&sw_desc->async_tx)) { 356 found = true; 357 break; 358 } 359 } 360 361 if (!found) { 362 spin_unlock_bh(&xor_dev->lock); 363 return NULL; 364 } 365 366 list_del(&sw_desc->free_list); 367 368 /* Release the channel */ 369 spin_unlock_bh(&xor_dev->lock); 370 371 return sw_desc; 372 } 373 374 /* 375 * Prepare a HW descriptor for a memcpy operation 376 */ 377 static struct dma_async_tx_descriptor * 378 mv_xor_v2_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, 379 dma_addr_t src, size_t len, unsigned long flags) 380 { 381 struct mv_xor_v2_sw_desc *sw_desc; 382 struct mv_xor_v2_descriptor *hw_descriptor; 383 struct mv_xor_v2_device *xor_dev; 384 385 xor_dev = container_of(chan, struct mv_xor_v2_device, dmachan); 386 387 dev_dbg(xor_dev->dmadev.dev, 388 "%s len: %zu src %pad dest %pad flags: %ld\n", 389 __func__, len, &src, &dest, flags); 390 391 sw_desc = mv_xor_v2_prep_sw_desc(xor_dev); 392 if (!sw_desc) 393 return NULL; 394 395 sw_desc->async_tx.flags = flags; 396 397 /* set the HW descriptor */ 398 hw_descriptor = &sw_desc->hw_desc; 399 400 /* save the SW descriptor ID to restore when operation is done */ 401 hw_descriptor->desc_id = sw_desc->idx; 402 403 /* Set the MEMCPY control word */ 404 hw_descriptor->desc_ctrl = 405 DESC_OP_MODE_MEMCPY << DESC_OP_MODE_SHIFT; 406 407 if (flags & DMA_PREP_INTERRUPT) 408 hw_descriptor->desc_ctrl |= DESC_IOD; 409 410 /* Set source address */ 411 hw_descriptor->fill_pattern_src_addr[0] = lower_32_bits(src); 412 hw_descriptor->fill_pattern_src_addr[1] = 413 upper_32_bits(src) & 0xFFFF; 414 415 /* Set Destination address */ 416 hw_descriptor->fill_pattern_src_addr[2] = lower_32_bits(dest); 417 hw_descriptor->fill_pattern_src_addr[3] = 418 upper_32_bits(dest) & 0xFFFF; 419 420 /* Set buffers size */ 421 hw_descriptor->buff_size = len; 422 423 /* return the async tx descriptor */ 424 return &sw_desc->async_tx; 425 } 426 427 /* 428 * Prepare a HW descriptor for a XOR operation 429 */ 430 static struct dma_async_tx_descriptor * 431 mv_xor_v2_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src, 432 unsigned int src_cnt, size_t len, unsigned long flags) 433 { 434 struct mv_xor_v2_sw_desc *sw_desc; 435 struct mv_xor_v2_descriptor *hw_descriptor; 436 struct mv_xor_v2_device *xor_dev = 437 container_of(chan, struct mv_xor_v2_device, dmachan); 438 int i; 439 440 if (src_cnt > MV_XOR_V2_CMD_LINE_NUM_MAX_D_BUF || src_cnt < 1) 441 return NULL; 442 443 dev_dbg(xor_dev->dmadev.dev, 444 "%s src_cnt: %d len: %zu dest %pad flags: %ld\n", 445 __func__, src_cnt, len, &dest, flags); 446 447 sw_desc = mv_xor_v2_prep_sw_desc(xor_dev); 448 if (!sw_desc) 449 return NULL; 450 451 sw_desc->async_tx.flags = flags; 452 453 /* set the HW descriptor */ 454 hw_descriptor = &sw_desc->hw_desc; 455 456 /* save the SW descriptor ID to restore when operation is done */ 457 hw_descriptor->desc_id = sw_desc->idx; 458 459 /* Set the XOR control word */ 460 hw_descriptor->desc_ctrl = 461 DESC_OP_MODE_XOR << DESC_OP_MODE_SHIFT; 462 hw_descriptor->desc_ctrl |= DESC_P_BUFFER_ENABLE; 463 464 if (flags & DMA_PREP_INTERRUPT) 465 hw_descriptor->desc_ctrl |= DESC_IOD; 466 467 /* Set the data buffers */ 468 for (i = 0; i < src_cnt; i++) 469 mv_xor_v2_set_data_buffers(xor_dev, hw_descriptor, src[i], i); 470 471 hw_descriptor->desc_ctrl |= 472 src_cnt << DESC_NUM_ACTIVE_D_BUF_SHIFT; 473 474 /* Set Destination address */ 475 hw_descriptor->fill_pattern_src_addr[2] = lower_32_bits(dest); 476 hw_descriptor->fill_pattern_src_addr[3] = 477 upper_32_bits(dest) & 0xFFFF; 478 479 /* Set buffers size */ 480 hw_descriptor->buff_size = len; 481 482 /* return the async tx descriptor */ 483 return &sw_desc->async_tx; 484 } 485 486 /* 487 * Prepare a HW descriptor for interrupt operation. 488 */ 489 static struct dma_async_tx_descriptor * 490 mv_xor_v2_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags) 491 { 492 struct mv_xor_v2_sw_desc *sw_desc; 493 struct mv_xor_v2_descriptor *hw_descriptor; 494 struct mv_xor_v2_device *xor_dev = 495 container_of(chan, struct mv_xor_v2_device, dmachan); 496 497 sw_desc = mv_xor_v2_prep_sw_desc(xor_dev); 498 if (!sw_desc) 499 return NULL; 500 501 /* set the HW descriptor */ 502 hw_descriptor = &sw_desc->hw_desc; 503 504 /* save the SW descriptor ID to restore when operation is done */ 505 hw_descriptor->desc_id = sw_desc->idx; 506 507 /* Set the INTERRUPT control word */ 508 hw_descriptor->desc_ctrl = 509 DESC_OP_MODE_NOP << DESC_OP_MODE_SHIFT; 510 hw_descriptor->desc_ctrl |= DESC_IOD; 511 512 /* return the async tx descriptor */ 513 return &sw_desc->async_tx; 514 } 515 516 /* 517 * push pending transactions to hardware 518 */ 519 static void mv_xor_v2_issue_pending(struct dma_chan *chan) 520 { 521 struct mv_xor_v2_device *xor_dev = 522 container_of(chan, struct mv_xor_v2_device, dmachan); 523 524 spin_lock_bh(&xor_dev->lock); 525 526 /* 527 * update the engine with the number of descriptors to 528 * process 529 */ 530 mv_xor_v2_add_desc_to_desq(xor_dev, xor_dev->npendings); 531 xor_dev->npendings = 0; 532 533 spin_unlock_bh(&xor_dev->lock); 534 } 535 536 static inline 537 int mv_xor_v2_get_pending_params(struct mv_xor_v2_device *xor_dev, 538 int *pending_ptr) 539 { 540 u32 reg; 541 542 reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_DONE_OFF); 543 544 /* get the next pending descriptor index */ 545 *pending_ptr = ((reg >> MV_XOR_V2_DMA_DESQ_DONE_READ_PTR_SHIFT) & 546 MV_XOR_V2_DMA_DESQ_DONE_READ_PTR_MASK); 547 548 /* get the number of descriptors pending handle */ 549 return ((reg >> MV_XOR_V2_DMA_DESQ_DONE_PENDING_SHIFT) & 550 MV_XOR_V2_DMA_DESQ_DONE_PENDING_MASK); 551 } 552 553 /* 554 * handle the descriptors after HW process 555 */ 556 static void mv_xor_v2_tasklet(struct tasklet_struct *t) 557 { 558 struct mv_xor_v2_device *xor_dev = from_tasklet(xor_dev, t, 559 irq_tasklet); 560 int pending_ptr, num_of_pending, i; 561 struct mv_xor_v2_sw_desc *next_pending_sw_desc = NULL; 562 563 dev_dbg(xor_dev->dmadev.dev, "%s %d\n", __func__, __LINE__); 564 565 /* get the pending descriptors parameters */ 566 num_of_pending = mv_xor_v2_get_pending_params(xor_dev, &pending_ptr); 567 568 /* loop over free descriptors */ 569 for (i = 0; i < num_of_pending; i++) { 570 struct mv_xor_v2_descriptor *next_pending_hw_desc = 571 xor_dev->hw_desq_virt + pending_ptr; 572 573 /* get the SW descriptor related to the HW descriptor */ 574 next_pending_sw_desc = 575 &xor_dev->sw_desq[next_pending_hw_desc->desc_id]; 576 577 /* call the callback */ 578 if (next_pending_sw_desc->async_tx.cookie > 0) { 579 /* 580 * update the channel's completed cookie - no 581 * lock is required the IMSG threshold provide 582 * the locking 583 */ 584 dma_cookie_complete(&next_pending_sw_desc->async_tx); 585 586 dma_descriptor_unmap(&next_pending_sw_desc->async_tx); 587 dmaengine_desc_get_callback_invoke( 588 &next_pending_sw_desc->async_tx, NULL); 589 } 590 591 dma_run_dependencies(&next_pending_sw_desc->async_tx); 592 593 /* Lock the channel */ 594 spin_lock(&xor_dev->lock); 595 596 /* add the SW descriptor to the free descriptors list */ 597 list_add(&next_pending_sw_desc->free_list, 598 &xor_dev->free_sw_desc); 599 600 /* Release the channel */ 601 spin_unlock(&xor_dev->lock); 602 603 /* increment the next descriptor */ 604 pending_ptr++; 605 if (pending_ptr >= MV_XOR_V2_DESC_NUM) 606 pending_ptr = 0; 607 } 608 609 if (num_of_pending != 0) { 610 /* free the descriptores */ 611 mv_xor_v2_free_desc_from_desq(xor_dev, num_of_pending); 612 } 613 } 614 615 /* 616 * Set DMA Interrupt-message (IMSG) parameters 617 */ 618 static void mv_xor_v2_set_msi_msg(struct msi_desc *desc, struct msi_msg *msg) 619 { 620 struct mv_xor_v2_device *xor_dev = dev_get_drvdata(desc->dev); 621 622 writel(msg->address_lo, 623 xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_BALR_OFF); 624 writel(msg->address_hi & 0xFFFF, 625 xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_BAHR_OFF); 626 writel(msg->data, 627 xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_CDAT_OFF); 628 } 629 630 static int mv_xor_v2_descq_init(struct mv_xor_v2_device *xor_dev) 631 { 632 u32 reg; 633 634 /* write the DESQ size to the DMA engine */ 635 writel(MV_XOR_V2_DESC_NUM, 636 xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_SIZE_OFF); 637 638 /* write the DESQ address to the DMA enngine*/ 639 writel(lower_32_bits(xor_dev->hw_desq), 640 xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_BALR_OFF); 641 writel(upper_32_bits(xor_dev->hw_desq), 642 xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_BAHR_OFF); 643 644 /* 645 * This is a temporary solution, until we activate the 646 * SMMU. Set the attributes for reading & writing data buffers 647 * & descriptors to: 648 * 649 * - OuterShareable - Snoops will be performed on CPU caches 650 * - Enable cacheable - Bufferable, Modifiable, Other Allocate 651 * and Allocate 652 */ 653 reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_ARATTR_OFF); 654 reg &= ~MV_XOR_V2_DMA_DESQ_ATTR_CACHE_MASK; 655 reg |= MV_XOR_V2_DMA_DESQ_ATTR_OUTER_SHAREABLE | 656 MV_XOR_V2_DMA_DESQ_ATTR_CACHEABLE; 657 writel(reg, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_ARATTR_OFF); 658 659 reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_AWATTR_OFF); 660 reg &= ~MV_XOR_V2_DMA_DESQ_ATTR_CACHE_MASK; 661 reg |= MV_XOR_V2_DMA_DESQ_ATTR_OUTER_SHAREABLE | 662 MV_XOR_V2_DMA_DESQ_ATTR_CACHEABLE; 663 writel(reg, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_AWATTR_OFF); 664 665 /* BW CTRL - set values to optimize the XOR performance: 666 * 667 * - Set WrBurstLen & RdBurstLen - the unit will issue 668 * maximum of 256B write/read transactions. 669 * - Limit the number of outstanding write & read data 670 * (OBB/IBB) requests to the maximal value. 671 */ 672 reg = ((MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_RD_VAL << 673 MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_RD_SHIFT) | 674 (MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_WR_VAL << 675 MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_WR_SHIFT) | 676 (MV_XOR_V2_GLOB_BW_CTRL_RD_BURST_LEN_VAL << 677 MV_XOR_V2_GLOB_BW_CTRL_RD_BURST_LEN_SHIFT) | 678 (MV_XOR_V2_GLOB_BW_CTRL_WR_BURST_LEN_VAL << 679 MV_XOR_V2_GLOB_BW_CTRL_WR_BURST_LEN_SHIFT)); 680 writel(reg, xor_dev->glob_base + MV_XOR_V2_GLOB_BW_CTRL); 681 682 /* Disable the AXI timer feature */ 683 reg = readl(xor_dev->glob_base + MV_XOR_V2_GLOB_PAUSE); 684 reg |= MV_XOR_V2_GLOB_PAUSE_AXI_TIME_DIS_VAL; 685 writel(reg, xor_dev->glob_base + MV_XOR_V2_GLOB_PAUSE); 686 687 /* enable the DMA engine */ 688 writel(0, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_STOP_OFF); 689 690 return 0; 691 } 692 693 static int mv_xor_v2_suspend(struct platform_device *dev, pm_message_t state) 694 { 695 struct mv_xor_v2_device *xor_dev = platform_get_drvdata(dev); 696 697 /* Set this bit to disable to stop the XOR unit. */ 698 writel(0x1, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_STOP_OFF); 699 700 return 0; 701 } 702 703 static int mv_xor_v2_resume(struct platform_device *dev) 704 { 705 struct mv_xor_v2_device *xor_dev = platform_get_drvdata(dev); 706 707 mv_xor_v2_set_desc_size(xor_dev); 708 mv_xor_v2_enable_imsg_thrd(xor_dev); 709 mv_xor_v2_descq_init(xor_dev); 710 711 return 0; 712 } 713 714 static int mv_xor_v2_probe(struct platform_device *pdev) 715 { 716 struct mv_xor_v2_device *xor_dev; 717 struct resource *res; 718 int i, ret = 0; 719 struct dma_device *dma_dev; 720 struct mv_xor_v2_sw_desc *sw_desc; 721 722 BUILD_BUG_ON(sizeof(struct mv_xor_v2_descriptor) != 723 MV_XOR_V2_EXT_DESC_SIZE); 724 725 xor_dev = devm_kzalloc(&pdev->dev, sizeof(*xor_dev), GFP_KERNEL); 726 if (!xor_dev) 727 return -ENOMEM; 728 729 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 730 xor_dev->dma_base = devm_ioremap_resource(&pdev->dev, res); 731 if (IS_ERR(xor_dev->dma_base)) 732 return PTR_ERR(xor_dev->dma_base); 733 734 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 735 xor_dev->glob_base = devm_ioremap_resource(&pdev->dev, res); 736 if (IS_ERR(xor_dev->glob_base)) 737 return PTR_ERR(xor_dev->glob_base); 738 739 platform_set_drvdata(pdev, xor_dev); 740 741 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40)); 742 if (ret) 743 return ret; 744 745 xor_dev->reg_clk = devm_clk_get(&pdev->dev, "reg"); 746 if (PTR_ERR(xor_dev->reg_clk) != -ENOENT) { 747 if (!IS_ERR(xor_dev->reg_clk)) { 748 ret = clk_prepare_enable(xor_dev->reg_clk); 749 if (ret) 750 return ret; 751 } else { 752 return PTR_ERR(xor_dev->reg_clk); 753 } 754 } 755 756 xor_dev->clk = devm_clk_get(&pdev->dev, NULL); 757 if (PTR_ERR(xor_dev->clk) == -EPROBE_DEFER) { 758 ret = EPROBE_DEFER; 759 goto disable_reg_clk; 760 } 761 if (!IS_ERR(xor_dev->clk)) { 762 ret = clk_prepare_enable(xor_dev->clk); 763 if (ret) 764 goto disable_reg_clk; 765 } 766 767 ret = platform_msi_domain_alloc_irqs(&pdev->dev, 1, 768 mv_xor_v2_set_msi_msg); 769 if (ret) 770 goto disable_clk; 771 772 xor_dev->irq = msi_get_virq(&pdev->dev, 0); 773 774 ret = devm_request_irq(&pdev->dev, xor_dev->irq, 775 mv_xor_v2_interrupt_handler, 0, 776 dev_name(&pdev->dev), xor_dev); 777 if (ret) 778 goto free_msi_irqs; 779 780 tasklet_setup(&xor_dev->irq_tasklet, mv_xor_v2_tasklet); 781 782 xor_dev->desc_size = mv_xor_v2_set_desc_size(xor_dev); 783 784 dma_cookie_init(&xor_dev->dmachan); 785 786 /* 787 * allocate coherent memory for hardware descriptors 788 * note: writecombine gives slightly better performance, but 789 * requires that we explicitly flush the writes 790 */ 791 xor_dev->hw_desq_virt = 792 dma_alloc_coherent(&pdev->dev, 793 xor_dev->desc_size * MV_XOR_V2_DESC_NUM, 794 &xor_dev->hw_desq, GFP_KERNEL); 795 if (!xor_dev->hw_desq_virt) { 796 ret = -ENOMEM; 797 goto free_msi_irqs; 798 } 799 800 /* alloc memory for the SW descriptors */ 801 xor_dev->sw_desq = devm_kcalloc(&pdev->dev, 802 MV_XOR_V2_DESC_NUM, sizeof(*sw_desc), 803 GFP_KERNEL); 804 if (!xor_dev->sw_desq) { 805 ret = -ENOMEM; 806 goto free_hw_desq; 807 } 808 809 spin_lock_init(&xor_dev->lock); 810 811 /* init the free SW descriptors list */ 812 INIT_LIST_HEAD(&xor_dev->free_sw_desc); 813 814 /* add all SW descriptors to the free list */ 815 for (i = 0; i < MV_XOR_V2_DESC_NUM; i++) { 816 struct mv_xor_v2_sw_desc *sw_desc = 817 xor_dev->sw_desq + i; 818 sw_desc->idx = i; 819 dma_async_tx_descriptor_init(&sw_desc->async_tx, 820 &xor_dev->dmachan); 821 sw_desc->async_tx.tx_submit = mv_xor_v2_tx_submit; 822 async_tx_ack(&sw_desc->async_tx); 823 824 list_add(&sw_desc->free_list, 825 &xor_dev->free_sw_desc); 826 } 827 828 dma_dev = &xor_dev->dmadev; 829 830 /* set DMA capabilities */ 831 dma_cap_zero(dma_dev->cap_mask); 832 dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); 833 dma_cap_set(DMA_XOR, dma_dev->cap_mask); 834 dma_cap_set(DMA_INTERRUPT, dma_dev->cap_mask); 835 836 /* init dma link list */ 837 INIT_LIST_HEAD(&dma_dev->channels); 838 839 /* set base routines */ 840 dma_dev->device_tx_status = dma_cookie_status; 841 dma_dev->device_issue_pending = mv_xor_v2_issue_pending; 842 dma_dev->dev = &pdev->dev; 843 844 dma_dev->device_prep_dma_memcpy = mv_xor_v2_prep_dma_memcpy; 845 dma_dev->device_prep_dma_interrupt = mv_xor_v2_prep_dma_interrupt; 846 dma_dev->max_xor = 8; 847 dma_dev->device_prep_dma_xor = mv_xor_v2_prep_dma_xor; 848 849 xor_dev->dmachan.device = dma_dev; 850 851 list_add_tail(&xor_dev->dmachan.device_node, 852 &dma_dev->channels); 853 854 mv_xor_v2_enable_imsg_thrd(xor_dev); 855 856 mv_xor_v2_descq_init(xor_dev); 857 858 ret = dma_async_device_register(dma_dev); 859 if (ret) 860 goto free_hw_desq; 861 862 dev_notice(&pdev->dev, "Marvell Version 2 XOR driver\n"); 863 864 return 0; 865 866 free_hw_desq: 867 dma_free_coherent(&pdev->dev, 868 xor_dev->desc_size * MV_XOR_V2_DESC_NUM, 869 xor_dev->hw_desq_virt, xor_dev->hw_desq); 870 free_msi_irqs: 871 platform_msi_domain_free_irqs(&pdev->dev); 872 disable_clk: 873 clk_disable_unprepare(xor_dev->clk); 874 disable_reg_clk: 875 clk_disable_unprepare(xor_dev->reg_clk); 876 return ret; 877 } 878 879 static int mv_xor_v2_remove(struct platform_device *pdev) 880 { 881 struct mv_xor_v2_device *xor_dev = platform_get_drvdata(pdev); 882 883 dma_async_device_unregister(&xor_dev->dmadev); 884 885 dma_free_coherent(&pdev->dev, 886 xor_dev->desc_size * MV_XOR_V2_DESC_NUM, 887 xor_dev->hw_desq_virt, xor_dev->hw_desq); 888 889 devm_free_irq(&pdev->dev, xor_dev->irq, xor_dev); 890 891 platform_msi_domain_free_irqs(&pdev->dev); 892 893 tasklet_kill(&xor_dev->irq_tasklet); 894 895 clk_disable_unprepare(xor_dev->clk); 896 clk_disable_unprepare(xor_dev->reg_clk); 897 898 return 0; 899 } 900 901 #ifdef CONFIG_OF 902 static const struct of_device_id mv_xor_v2_dt_ids[] = { 903 { .compatible = "marvell,xor-v2", }, 904 {}, 905 }; 906 MODULE_DEVICE_TABLE(of, mv_xor_v2_dt_ids); 907 #endif 908 909 static struct platform_driver mv_xor_v2_driver = { 910 .probe = mv_xor_v2_probe, 911 .suspend = mv_xor_v2_suspend, 912 .resume = mv_xor_v2_resume, 913 .remove = mv_xor_v2_remove, 914 .driver = { 915 .name = "mv_xor_v2", 916 .of_match_table = of_match_ptr(mv_xor_v2_dt_ids), 917 }, 918 }; 919 920 module_platform_driver(mv_xor_v2_driver); 921 922 MODULE_DESCRIPTION("DMA engine driver for Marvell's Version 2 of XOR engine"); 923 MODULE_LICENSE("GPL"); 924