drivers/nvme/nvme.c

   1 /*
   2  * Copyright (C) 2017 NXP Semiconductors
   3  * Copyright (C) 2017 Bin Meng <bmeng.cn@gmail.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <errno.h>
  11 #include <memalign.h>
  12 #include <pci.h>
  13 #include <dm/device-internal.h>
  14 #include "nvme.h"
  15
  16 struct nvme_info *nvme_info;
  17
  18 #define NVME_Q_DEPTH            2
  19 #define NVME_AQ_DEPTH           2
  20 #define NVME_SQ_SIZE(depth)     (depth * sizeof(struct nvme_command))
  21 #define NVME_CQ_SIZE(depth)     (depth * sizeof(struct nvme_completion))
  22 #define ADMIN_TIMEOUT           60
  23 #define IO_TIMEOUT              30
  24 #define MAX_PRP_POOL            512
  25
  26 /*
  27  * An NVM Express queue. Each device has at least two (one for admin
  28  * commands and one for I/O commands).
  29  */
  30 struct nvme_queue {
  31         struct nvme_dev *dev;
  32         struct nvme_command *sq_cmds;
  33         struct nvme_completion *cqes;
  34         wait_queue_head_t sq_full;
  35         u32 __iomem *q_db;
  36         u16 q_depth;
  37         s16 cq_vector;
  38         u16 sq_head;
  39         u16 sq_tail;
  40         u16 cq_head;
  41         u16 qid;
  42         u8 cq_phase;
  43         u8 cqe_seen;
  44         unsigned long cmdid_data[];
  45 };
  46
  47 static int nvme_wait_ready(struct nvme_dev *dev, bool enabled)
  48 {
  49         u32 bit = enabled ? NVME_CSTS_RDY : 0;
  50
  51         while ((readl(&dev->bar->csts) & NVME_CSTS_RDY) != bit)
  52                 udelay(10000);
  53
  54         return 0;
  55 }
  56
  57 static int nvme_setup_prps(struct nvme_dev *dev, u64 *prp2,
  58                            int total_len, u64 dma_addr)
  59 {
  60         u32 page_size = dev->page_size;
  61         int offset = dma_addr & (page_size - 1);
  62         u64 *prp_pool;
  63         int length = total_len;
  64         int i, nprps;
  65         length -= (page_size - offset);
  66
  67         if (length <= 0) {
  68                 *prp2 = 0;
  69                 return 0;
  70         }
  71
  72         if (length)
  73                 dma_addr += (page_size - offset);
  74
  75         if (length <= page_size) {
  76                 *prp2 = dma_addr;
  77                 return 0;
  78         }
  79
  80         nprps = DIV_ROUND_UP(length, page_size);
  81
  82         if (nprps > dev->prp_entry_num) {
  83                 free(dev->prp_pool);
  84                 dev->prp_pool = malloc(nprps << 3);
  85                 if (!dev->prp_pool) {
  86                         printf("Error: malloc prp_pool fail\n");
  87                         return -ENOMEM;
  88                 }
  89                 dev->prp_entry_num = nprps;
  90         }
  91
  92         prp_pool = dev->prp_pool;
  93         i = 0;
  94         while (nprps) {
  95                 if (i == ((page_size >> 3) - 1)) {
  96                         *(prp_pool + i) = cpu_to_le64((ulong)prp_pool +
  97                                         page_size);
  98                         i = 0;
  99                         prp_pool += page_size;
 100                 }
 101                 *(prp_pool + i++) = cpu_to_le64(dma_addr);
 102                 dma_addr += page_size;
 103                 nprps--;
 104         }
 105         *prp2 = (ulong)dev->prp_pool;
 106
 107         return 0;
 108 }
 109
 110 static __le16 nvme_get_cmd_id(void)
 111 {
 112         static unsigned short cmdid;
 113
 114         return cpu_to_le16((cmdid < USHRT_MAX) ? cmdid++ : 0);
 115 }
 116
 117 static u16 nvme_read_completion_status(struct nvme_queue *nvmeq, u16 index)
 118 {
 119         u64 start = (ulong)&nvmeq->cqes[index];
 120         u64 stop = start + sizeof(struct nvme_completion);
 121
 122         invalidate_dcache_range(start, stop);
 123
 124         return le16_to_cpu(readw(&(nvmeq->cqes[index].status)));
 125 }
 126
 127 /**
 128  * nvme_submit_cmd() - copy a command into a queue and ring the doorbell
 129  *
 130  * @nvmeq:      The queue to use
 131  * @cmd:        The command to send
 132  */
 133 static void nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd)
 134 {
 135         u16 tail = nvmeq->sq_tail;
 136
 137         memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd));
 138         flush_dcache_range((ulong)&nvmeq->sq_cmds[tail],
 139                            (ulong)&nvmeq->sq_cmds[tail] + sizeof(*cmd));
 140
 141         if (++tail == nvmeq->q_depth)
 142                 tail = 0;
 143         writel(tail, nvmeq->q_db);
 144         nvmeq->sq_tail = tail;
 145 }
 146
 147 static int nvme_submit_sync_cmd(struct nvme_queue *nvmeq,
 148                                 struct nvme_command *cmd,
 149                                 u32 *result, unsigned timeout)
 150 {
 151         u16 head = nvmeq->cq_head;
 152         u16 phase = nvmeq->cq_phase;
 153         u16 status;
 154         ulong start_time;
 155         ulong timeout_us = timeout * 100000;
 156
 157         cmd->common.command_id = nvme_get_cmd_id();
 158         nvme_submit_cmd(nvmeq, cmd);
 159
 160         start_time = timer_get_us();
 161
 162         for (;;) {
 163                 status = nvme_read_completion_status(nvmeq, head);
 164                 if ((status & 0x01) == phase)
 165                         break;
 166                 if (timeout_us > 0 && (timer_get_us() - start_time)
 167                     >= timeout_us)
 168                         return -ETIMEDOUT;
 169         }
 170
 171         status >>= 1;
 172         if (status) {
 173                 printf("ERROR: status = %x, phase = %d, head = %d\n",
 174                        status, phase, head);
 175                 status = 0;
 176                 if (++head == nvmeq->q_depth) {
 177                         head = 0;
 178                         phase = !phase;
 179                 }
 180                 writel(head, nvmeq->q_db + nvmeq->dev->db_stride);
 181                 nvmeq->cq_head = head;
 182                 nvmeq->cq_phase = phase;
 183
 184                 return -EIO;
 185         }
 186
 187         if (result)
 188                 *result = le32_to_cpu(readl(&(nvmeq->cqes[head].result)));
 189
 190         if (++head == nvmeq->q_depth) {
 191                 head = 0;
 192                 phase = !phase;
 193         }
 194         writel(head, nvmeq->q_db + nvmeq->dev->db_stride);
 195         nvmeq->cq_head = head;
 196         nvmeq->cq_phase = phase;
 197
 198         return status;
 199 }
 200
 201 static int nvme_submit_admin_cmd(struct nvme_dev *dev, struct nvme_command *cmd,
 202                                  u32 *result)
 203 {
 204         return nvme_submit_sync_cmd(dev->queues[0], cmd, result, ADMIN_TIMEOUT);
 205 }
 206
 207 static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev,
 208                                            int qid, int depth)
 209 {
 210         struct nvme_queue *nvmeq = malloc(sizeof(*nvmeq));
 211         if (!nvmeq)
 212                 return NULL;
 213         memset(nvmeq, 0, sizeof(*nvmeq));
 214
 215         nvmeq->cqes = (void *)memalign(4096, NVME_CQ_SIZE(depth));
 216         if (!nvmeq->cqes)
 217                 goto free_nvmeq;
 218         memset((void *)nvmeq->cqes, 0, NVME_CQ_SIZE(depth));
 219
 220         nvmeq->sq_cmds = (void *)memalign(4096, NVME_SQ_SIZE(depth));
 221         if (!nvmeq->sq_cmds)
 222                 goto free_queue;
 223         memset((void *)nvmeq->sq_cmds, 0, NVME_SQ_SIZE(depth));
 224
 225         nvmeq->dev = dev;
 226
 227         nvmeq->cq_head = 0;
 228         nvmeq->cq_phase = 1;
 229         nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
 230         nvmeq->q_depth = depth;
 231         nvmeq->qid = qid;
 232         dev->queue_count++;
 233         dev->queues[qid] = nvmeq;
 234
 235         return nvmeq;
 236
 237  free_queue:
 238         free((void *)nvmeq->cqes);
 239  free_nvmeq:
 240         free(nvmeq);
 241
 242         return NULL;
 243 }
 244
 245 static int nvme_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id)
 246 {
 247         struct nvme_command c;
 248
 249         memset(&c, 0, sizeof(c));
 250         c.delete_queue.opcode = opcode;
 251         c.delete_queue.qid = cpu_to_le16(id);
 252
 253         return nvme_submit_admin_cmd(dev, &c, NULL);
 254 }
 255
 256 static int nvme_delete_sq(struct nvme_dev *dev, u16 sqid)
 257 {
 258         return nvme_delete_queue(dev, nvme_admin_delete_sq, sqid);
 259 }
 260
 261 static int nvme_delete_cq(struct nvme_dev *dev, u16 cqid)
 262 {
 263         return nvme_delete_queue(dev, nvme_admin_delete_cq, cqid);
 264 }
 265
 266 static int nvme_enable_ctrl(struct nvme_dev *dev)
 267 {
 268         dev->ctrl_config &= ~NVME_CC_SHN_MASK;
 269         dev->ctrl_config |= NVME_CC_ENABLE;
 270         writel(cpu_to_le32(dev->ctrl_config), &dev->bar->cc);
 271
 272         return nvme_wait_ready(dev, true);
 273 }
 274
 275 static int nvme_disable_ctrl(struct nvme_dev *dev)
 276 {
 277         dev->ctrl_config &= ~NVME_CC_SHN_MASK;
 278         dev->ctrl_config &= ~NVME_CC_ENABLE;
 279         writel(cpu_to_le32(dev->ctrl_config), &dev->bar->cc);
 280
 281         return nvme_wait_ready(dev, false);
 282 }
 283
 284 static void nvme_free_queue(struct nvme_queue *nvmeq)
 285 {
 286         free((void *)nvmeq->cqes);
 287         free(nvmeq->sq_cmds);
 288         free(nvmeq);
 289 }
 290
 291 static void nvme_free_queues(struct nvme_dev *dev, int lowest)
 292 {
 293         int i;
 294
 295         for (i = dev->queue_count - 1; i >= lowest; i--) {
 296                 struct nvme_queue *nvmeq = dev->queues[i];
 297                 dev->queue_count--;
 298                 dev->queues[i] = NULL;
 299                 nvme_free_queue(nvmeq);
 300         }
 301 }
 302
 303 static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid)
 304 {
 305         struct nvme_dev *dev = nvmeq->dev;
 306
 307         nvmeq->sq_tail = 0;
 308         nvmeq->cq_head = 0;
 309         nvmeq->cq_phase = 1;
 310         nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
 311         memset((void *)nvmeq->cqes, 0, NVME_CQ_SIZE(nvmeq->q_depth));
 312         flush_dcache_range((ulong)nvmeq->cqes,
 313                            (ulong)nvmeq->cqes + NVME_CQ_SIZE(nvmeq->q_depth));
 314         dev->online_queues++;
 315 }
 316
 317 static int nvme_configure_admin_queue(struct nvme_dev *dev)
 318 {
 319         int result;
 320         u32 aqa;
 321         u64 cap = nvme_readq(&dev->bar->cap);
 322         struct nvme_queue *nvmeq;
 323         /* most architectures use 4KB as the page size */
 324         unsigned page_shift = 12;
 325         unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12;
 326         unsigned dev_page_max = NVME_CAP_MPSMAX(cap) + 12;
 327
 328         if (page_shift < dev_page_min) {
 329                 debug("Device minimum page size (%u) too large for host (%u)\n",
 330                       1 << dev_page_min, 1 << page_shift);
 331                 return -ENODEV;
 332         }
 333
 334         if (page_shift > dev_page_max) {
 335                 debug("Device maximum page size (%u) smaller than host (%u)\n",
 336                       1 << dev_page_max, 1 << page_shift);
 337                 page_shift = dev_page_max;
 338         }
 339
 340         result = nvme_disable_ctrl(dev);
 341         if (result < 0)
 342                 return result;
 343
 344         nvmeq = dev->queues[0];
 345         if (!nvmeq) {
 346                 nvmeq = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH);
 347                 if (!nvmeq)
 348                         return -ENOMEM;
 349         }
 350
 351         aqa = nvmeq->q_depth - 1;
 352         aqa |= aqa << 16;
 353         aqa |= aqa << 16;
 354
 355         dev->page_size = 1 << page_shift;
 356
 357         dev->ctrl_config = NVME_CC_CSS_NVM;
 358         dev->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
 359         dev->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
 360         dev->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
 361
 362         writel(aqa, &dev->bar->aqa);
 363         nvme_writeq((ulong)nvmeq->sq_cmds, &dev->bar->asq);
 364         nvme_writeq((ulong)nvmeq->cqes, &dev->bar->acq);
 365
 366         result = nvme_enable_ctrl(dev);
 367         if (result)
 368                 goto free_nvmeq;
 369
 370         nvmeq->cq_vector = 0;
 371
 372         nvme_init_queue(dev->queues[0], 0);
 373
 374         return result;
 375
 376  free_nvmeq:
 377         nvme_free_queues(dev, 0);
 378
 379         return result;
 380 }
 381
 382 static int nvme_alloc_cq(struct nvme_dev *dev, u16 qid,
 383                             struct nvme_queue *nvmeq)
 384 {
 385         struct nvme_command c;
 386         int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED;
 387
 388         memset(&c, 0, sizeof(c));
 389         c.create_cq.opcode = nvme_admin_create_cq;
 390         c.create_cq.prp1 = cpu_to_le64((ulong)nvmeq->cqes);
 391         c.create_cq.cqid = cpu_to_le16(qid);
 392         c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
 393         c.create_cq.cq_flags = cpu_to_le16(flags);
 394         c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector);
 395
 396         return nvme_submit_admin_cmd(dev, &c, NULL);
 397 }
 398
 399 static int nvme_alloc_sq(struct nvme_dev *dev, u16 qid,
 400                             struct nvme_queue *nvmeq)
 401 {
 402         struct nvme_command c;
 403         int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM;
 404
 405         memset(&c, 0, sizeof(c));
 406         c.create_sq.opcode = nvme_admin_create_sq;
 407         c.create_sq.prp1 = cpu_to_le64((ulong)nvmeq->sq_cmds);
 408         c.create_sq.sqid = cpu_to_le16(qid);
 409         c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
 410         c.create_sq.sq_flags = cpu_to_le16(flags);
 411         c.create_sq.cqid = cpu_to_le16(qid);
 412
 413         return nvme_submit_admin_cmd(dev, &c, NULL);
 414 }
 415
 416 int nvme_identify(struct nvme_dev *dev, unsigned nsid,
 417                   unsigned cns, dma_addr_t dma_addr)
 418 {
 419         struct nvme_command c;
 420         u32 page_size = dev->page_size;
 421         int offset = dma_addr & (page_size - 1);
 422         int length = sizeof(struct nvme_id_ctrl);
 423
 424         memset(&c, 0, sizeof(c));
 425         c.identify.opcode = nvme_admin_identify;
 426         c.identify.nsid = cpu_to_le32(nsid);
 427         c.identify.prp1 = cpu_to_le64(dma_addr);
 428
 429         length -= (page_size - offset);
 430         if (length <= 0) {
 431                 c.identify.prp2 = 0;
 432         } else {
 433                 dma_addr += (page_size - offset);
 434                 c.identify.prp2 = dma_addr;
 435         }
 436
 437         c.identify.cns = cpu_to_le32(cns);
 438
 439         return nvme_submit_admin_cmd(dev, &c, NULL);
 440 }
 441
 442 int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid,
 443                       dma_addr_t dma_addr, u32 *result)
 444 {
 445         struct nvme_command c;
 446
 447         memset(&c, 0, sizeof(c));
 448         c.features.opcode = nvme_admin_get_features;
 449         c.features.nsid = cpu_to_le32(nsid);
 450         c.features.prp1 = cpu_to_le64(dma_addr);
 451         c.features.fid = cpu_to_le32(fid);
 452
 453         return nvme_submit_admin_cmd(dev, &c, result);
 454 }
 455
 456 int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11,
 457                       dma_addr_t dma_addr, u32 *result)
 458 {
 459         struct nvme_command c;
 460
 461         memset(&c, 0, sizeof(c));
 462         c.features.opcode = nvme_admin_set_features;
 463         c.features.prp1 = cpu_to_le64(dma_addr);
 464         c.features.fid = cpu_to_le32(fid);
 465         c.features.dword11 = cpu_to_le32(dword11);
 466
 467         return nvme_submit_admin_cmd(dev, &c, result);
 468 }
 469
 470 static int nvme_create_queue(struct nvme_queue *nvmeq, int qid)
 471 {
 472         struct nvme_dev *dev = nvmeq->dev;
 473         int result;
 474
 475         nvmeq->cq_vector = qid - 1;
 476         result = nvme_alloc_cq(dev, qid, nvmeq);
 477         if (result < 0)
 478                 goto release_cq;
 479
 480         result = nvme_alloc_sq(dev, qid, nvmeq);
 481         if (result < 0)
 482                 goto release_sq;
 483
 484         nvme_init_queue(nvmeq, qid);
 485
 486         return result;
 487
 488  release_sq:
 489         nvme_delete_sq(dev, qid);
 490  release_cq:
 491         nvme_delete_cq(dev, qid);
 492
 493         return result;
 494 }
 495
 496 static int nvme_set_queue_count(struct nvme_dev *dev, int count)
 497 {
 498         int status;
 499         u32 result;
 500         u32 q_count = (count - 1) | ((count - 1) << 16);
 501
 502         status = nvme_set_features(dev, NVME_FEAT_NUM_QUEUES,
 503                         q_count, 0, &result);
 504
 505         if (status < 0)
 506                 return status;
 507         if (status > 1)
 508                 return 0;
 509
 510         return min(result & 0xffff, result >> 16) + 1;
 511 }
 512
 513 static void nvme_create_io_queues(struct nvme_dev *dev)
 514 {
 515         unsigned int i;
 516
 517         for (i = dev->queue_count; i <= dev->max_qid; i++)
 518                 if (!nvme_alloc_queue(dev, i, dev->q_depth))
 519                         break;
 520
 521         for (i = dev->online_queues; i <= dev->queue_count - 1; i++)
 522                 if (nvme_create_queue(dev->queues[i], i))
 523                         break;
 524 }
 525
 526 static int nvme_setup_io_queues(struct nvme_dev *dev)
 527 {
 528         int nr_io_queues;
 529         int result;
 530
 531         nr_io_queues = 1;
 532         result = nvme_set_queue_count(dev, nr_io_queues);
 533         if (result <= 0)
 534                 return result;
 535
 536         if (result < nr_io_queues)
 537                 nr_io_queues = result;
 538
 539         dev->max_qid = nr_io_queues;
 540
 541         /* Free previously allocated queues */
 542         nvme_free_queues(dev, nr_io_queues + 1);
 543         nvme_create_io_queues(dev);
 544
 545         return 0;
 546 }
 547
 548 static int nvme_get_info_from_identify(struct nvme_dev *dev)
 549 {
 550         u16 vendor, device;
 551         struct nvme_id_ctrl buf, *ctrl = &buf;
 552         int ret;
 553         int shift = NVME_CAP_MPSMIN(nvme_readq(&dev->bar->cap)) + 12;
 554
 555         ret = nvme_identify(dev, 0, 1, (dma_addr_t)ctrl);
 556         if (ret)
 557                 return -EIO;
 558
 559         dev->nn = le32_to_cpu(ctrl->nn);
 560         dev->vwc = ctrl->vwc;
 561         memcpy(dev->serial, ctrl->sn, sizeof(ctrl->sn));
 562         memcpy(dev->model, ctrl->mn, sizeof(ctrl->mn));
 563         memcpy(dev->firmware_rev, ctrl->fr, sizeof(ctrl->fr));
 564         if (ctrl->mdts)
 565                 dev->max_transfer_shift = (ctrl->mdts + shift);
 566
 567         /* Apply quirk stuff */
 568         dm_pci_read_config16(dev->pdev, PCI_VENDOR_ID, &vendor);
 569         dm_pci_read_config16(dev->pdev, PCI_DEVICE_ID, &device);
 570         if ((vendor == PCI_VENDOR_ID_INTEL) &&
 571             (device == 0x0953) && ctrl->vs[3]) {
 572                 unsigned int max_transfer_shift;
 573                 dev->stripe_size = (ctrl->vs[3] + shift);
 574                 max_transfer_shift = (ctrl->vs[3] + 18);
 575                 if (dev->max_transfer_shift) {
 576                         dev->max_transfer_shift = min(max_transfer_shift,
 577                                                       dev->max_transfer_shift);
 578                 } else {
 579                         dev->max_transfer_shift = max_transfer_shift;
 580                 }
 581         }
 582
 583         return 0;
 584 }
 585
 586 int nvme_scan_namespace(void)
 587 {
 588         struct uclass *uc;
 589         struct udevice *dev;
 590         int ret;
 591
 592         ret = uclass_get(UCLASS_NVME, &uc);
 593         if (ret)
 594                 return ret;
 595
 596         uclass_foreach_dev(dev, uc) {
 597                 ret = device_probe(dev);
 598                 if (ret)
 599                         return ret;
 600         }
 601
 602         return 0;
 603 }
 604
 605 static int nvme_blk_probe(struct udevice *udev)
 606 {
 607         struct nvme_dev *ndev = dev_get_priv(udev->parent);
 608         struct blk_desc *desc = dev_get_uclass_platdata(udev);
 609         struct nvme_ns *ns = dev_get_priv(udev);
 610         u8 flbas;
 611         u16 vendor;
 612         struct nvme_id_ns buf, *id = &buf;
 613
 614         memset(ns, 0, sizeof(*ns));
 615         ns->dev = ndev;
 616         ns->ns_id = desc->devnum - ndev->blk_dev_start + 1;
 617         if (nvme_identify(ndev, ns->ns_id, 0, (dma_addr_t)id))
 618                 return -EIO;
 619
 620         flbas = id->flbas & NVME_NS_FLBAS_LBA_MASK;
 621         ns->flbas = flbas;
 622         ns->lba_shift = id->lbaf[flbas].ds;
 623         ns->mode_select_num_blocks = le64_to_cpu(id->nuse);
 624         ns->mode_select_block_len = 1 << ns->lba_shift;
 625         list_add(&ns->list, &ndev->namespaces);
 626
 627         desc->lba = ns->mode_select_num_blocks;
 628         desc->log2blksz = ns->lba_shift;
 629         desc->blksz = 1 << ns->lba_shift;
 630         desc->bdev = udev;
 631         dm_pci_read_config16(ndev->pdev, PCI_VENDOR_ID, &vendor);
 632         sprintf(desc->vendor, "0x%.4x", vendor);
 633         memcpy(desc->product, ndev->serial, sizeof(ndev->serial));
 634         memcpy(desc->revision, ndev->firmware_rev, sizeof(ndev->firmware_rev));
 635         part_init(desc);
 636
 637         return 0;
 638 }
 639
 640 static ulong nvme_blk_read(struct udevice *udev, lbaint_t blknr,
 641                            lbaint_t blkcnt, void *buffer)
 642 {
 643         struct nvme_ns *ns = dev_get_priv(udev);
 644         struct nvme_dev *dev = ns->dev;
 645         struct nvme_command c;
 646         struct blk_desc *desc = dev_get_uclass_platdata(udev);
 647         int status;
 648         u64 prp2;
 649         u64 total_len = blkcnt << desc->log2blksz;
 650         u64 temp_len = total_len;
 651
 652         u64 slba = blknr;
 653         u16 lbas = 1 << (dev->max_transfer_shift - ns->lba_shift);
 654         u64 total_lbas = blkcnt;
 655
 656         c.rw.opcode = nvme_cmd_read;
 657         c.rw.flags = 0;
 658         c.rw.nsid = cpu_to_le32(ns->ns_id);
 659         c.rw.control = 0;
 660         c.rw.dsmgmt = 0;
 661         c.rw.reftag = 0;
 662         c.rw.apptag = 0;
 663         c.rw.appmask = 0;
 664         c.rw.metadata = 0;
 665
 666         while (total_lbas) {
 667                 if (total_lbas < lbas) {
 668                         lbas = (u16)total_lbas;
 669                         total_lbas = 0;
 670                 } else {
 671                         total_lbas -= lbas;
 672                 }
 673
 674                 if (nvme_setup_prps
 675                    (dev, &prp2, lbas << ns->lba_shift, (ulong)buffer))
 676                         return -EIO;
 677                 c.rw.slba = cpu_to_le64(slba);
 678                 slba += lbas;
 679                 c.rw.length = cpu_to_le16(lbas - 1);
 680                 c.rw.prp1 = cpu_to_le64((ulong)buffer);
 681                 c.rw.prp2 = cpu_to_le64(prp2);
 682                 status = nvme_submit_sync_cmd(dev->queues[1],
 683                                 &c, NULL, IO_TIMEOUT);
 684                 if (status)
 685                         break;
 686                 temp_len -= lbas << ns->lba_shift;
 687                 buffer += lbas << ns->lba_shift;
 688         }
 689
 690         return (total_len - temp_len) >> desc->log2blksz;
 691 }
 692
 693 static ulong nvme_blk_write(struct udevice *udev, lbaint_t blknr,
 694                             lbaint_t blkcnt, const void *buffer)
 695 {
 696         struct nvme_ns *ns = dev_get_priv(udev);
 697         struct nvme_dev *dev = ns->dev;
 698         struct nvme_command c;
 699         struct blk_desc *desc = dev_get_uclass_platdata(udev);
 700         int status;
 701         u64 prp2;
 702         u64 total_len = blkcnt << desc->log2blksz;
 703         u64 temp_len = total_len;
 704
 705         u64 slba = blknr;
 706         u16 lbas = 1 << (dev->max_transfer_shift - ns->lba_shift);
 707         u64 total_lbas = blkcnt;
 708
 709         c.rw.opcode = nvme_cmd_write;
 710         c.rw.flags = 0;
 711         c.rw.nsid = cpu_to_le32(ns->ns_id);
 712         c.rw.control = 0;
 713         c.rw.dsmgmt = 0;
 714         c.rw.reftag = 0;
 715         c.rw.apptag = 0;
 716         c.rw.appmask = 0;
 717         c.rw.metadata = 0;
 718
 719         while (total_lbas) {
 720                 if (total_lbas < lbas) {
 721                         lbas = (u16)total_lbas;
 722                         total_lbas = 0;
 723                 } else {
 724                         total_lbas -= lbas;
 725                 }
 726
 727                 if (nvme_setup_prps
 728                    (dev, &prp2, lbas << ns->lba_shift, (ulong)buffer))
 729                         return -EIO;
 730                 c.rw.slba = cpu_to_le64(slba);
 731                 slba += lbas;
 732                 c.rw.length = cpu_to_le16(lbas - 1);
 733                 c.rw.prp1 = cpu_to_le64((ulong)buffer);
 734                 c.rw.prp2 = cpu_to_le64(prp2);
 735                 status = nvme_submit_sync_cmd(dev->queues[1],
 736                                 &c, NULL, IO_TIMEOUT);
 737                 if (status)
 738                         break;
 739                 temp_len -= lbas << ns->lba_shift;
 740                 buffer += lbas << ns->lba_shift;
 741         }
 742
 743         return (total_len - temp_len) >> desc->log2blksz;
 744 }
 745
 746 static const struct blk_ops nvme_blk_ops = {
 747         .read   = nvme_blk_read,
 748         .write  = nvme_blk_write,
 749 };
 750
 751 U_BOOT_DRIVER(nvme_blk) = {
 752         .name   = "nvme-blk",
 753         .id     = UCLASS_BLK,
 754         .probe  = nvme_blk_probe,
 755         .ops    = &nvme_blk_ops,
 756         .priv_auto_alloc_size = sizeof(struct nvme_ns),
 757 };
 758
 759 static int nvme_bind(struct udevice *udev)
 760 {
 761         char name[20];
 762         sprintf(name, "nvme#%d", nvme_info->ndev_num++);
 763
 764         return device_set_name(udev, name);
 765 }
 766
 767 static int nvme_probe(struct udevice *udev)
 768 {
 769         int ret;
 770         struct nvme_dev *ndev = dev_get_priv(udev);
 771         u64 cap;
 772
 773         ndev->pdev = pci_get_controller(udev);
 774         ndev->instance = trailing_strtol(udev->name);
 775
 776         INIT_LIST_HEAD(&ndev->namespaces);
 777         ndev->bar = dm_pci_map_bar(udev, PCI_BASE_ADDRESS_0,
 778                         PCI_REGION_MEM);
 779         if (readl(&ndev->bar->csts) == -1) {
 780                 ret = -ENODEV;
 781                 printf("Error: %s: Out of memory!\n", udev->name);
 782                 goto free_nvme;
 783         }
 784
 785         ndev->queues = malloc(2 * sizeof(struct nvme_queue));
 786         if (!ndev->queues) {
 787                 ret = -ENOMEM;
 788                 printf("Error: %s: Out of memory!\n", udev->name);
 789                 goto free_nvme;
 790         }
 791         memset(ndev->queues, 0, sizeof(2 * sizeof(struct nvme_queue)));
 792
 793         ndev->prp_pool = malloc(MAX_PRP_POOL);
 794         if (!ndev->prp_pool) {
 795                 ret = -ENOMEM;
 796                 printf("Error: %s: Out of memory!\n", udev->name);
 797                 goto free_nvme;
 798         }
 799         ndev->prp_entry_num = MAX_PRP_POOL >> 3;
 800
 801         cap = nvme_readq(&ndev->bar->cap);
 802         ndev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH);
 803         ndev->db_stride = 1 << NVME_CAP_STRIDE(cap);
 804         ndev->dbs = ((void __iomem *)ndev->bar) + 4096;
 805
 806         ret = nvme_configure_admin_queue(ndev);
 807         if (ret)
 808                 goto free_queue;
 809
 810         ret = nvme_setup_io_queues(ndev);
 811         if (ret)
 812                 goto free_queue;
 813
 814         nvme_get_info_from_identify(ndev);
 815         ndev->blk_dev_start = nvme_info->ns_num;
 816         list_add(&ndev->node, &nvme_info->dev_list);
 817
 818         return 0;
 819
 820 free_queue:
 821         free((void *)ndev->queues);
 822 free_nvme:
 823         return ret;
 824 }
 825
 826 U_BOOT_DRIVER(nvme) = {
 827         .name   = "nvme",
 828         .id     = UCLASS_NVME,
 829         .bind   = nvme_bind,
 830         .probe  = nvme_probe,
 831         .priv_auto_alloc_size = sizeof(struct nvme_dev),
 832 };
 833
 834 struct pci_device_id nvme_supported[] = {
 835         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0953) },
 836         {}
 837 };
 838
 839 U_BOOT_PCI_DEVICE(nvme, nvme_supported);