drivers/dma/fsl-qdma.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright 2014-2015 Freescale
   3 // Copyright 2018 NXP
   4
   5 /*
   6  * Driver for NXP Layerscape Queue Direct Memory Access Controller
   7  *
   8  * Author:
   9  *  Wen He <wen.he_1@nxp.com>
  10  *  Jiaheng Fan <jiaheng.fan@nxp.com>
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/delay.h>
  16 #include <linux/of_irq.h>
  17 #include <linux/of_platform.h>
  18 #include <linux/of_dma.h>
  19 #include <linux/dma-mapping.h>
  20
  21 #include "virt-dma.h"
  22 #include "fsldma.h"
  23
  24 /* Register related definition */
  25 #define FSL_QDMA_DMR                    0x0
  26 #define FSL_QDMA_DSR                    0x4
  27 #define FSL_QDMA_DEIER                  0xe00
  28 #define FSL_QDMA_DEDR                   0xe04
  29 #define FSL_QDMA_DECFDW0R               0xe10
  30 #define FSL_QDMA_DECFDW1R               0xe14
  31 #define FSL_QDMA_DECFDW2R               0xe18
  32 #define FSL_QDMA_DECFDW3R               0xe1c
  33 #define FSL_QDMA_DECFQIDR               0xe30
  34 #define FSL_QDMA_DECBR                  0xe34
  35
  36 #define FSL_QDMA_BCQMR(x)               (0xc0 + 0x100 * (x))
  37 #define FSL_QDMA_BCQSR(x)               (0xc4 + 0x100 * (x))
  38 #define FSL_QDMA_BCQEDPA_SADDR(x)       (0xc8 + 0x100 * (x))
  39 #define FSL_QDMA_BCQDPA_SADDR(x)        (0xcc + 0x100 * (x))
  40 #define FSL_QDMA_BCQEEPA_SADDR(x)       (0xd0 + 0x100 * (x))
  41 #define FSL_QDMA_BCQEPA_SADDR(x)        (0xd4 + 0x100 * (x))
  42 #define FSL_QDMA_BCQIER(x)              (0xe0 + 0x100 * (x))
  43 #define FSL_QDMA_BCQIDR(x)              (0xe4 + 0x100 * (x))
  44
  45 #define FSL_QDMA_SQDPAR                 0x80c
  46 #define FSL_QDMA_SQEPAR                 0x814
  47 #define FSL_QDMA_BSQMR                  0x800
  48 #define FSL_QDMA_BSQSR                  0x804
  49 #define FSL_QDMA_BSQICR                 0x828
  50 #define FSL_QDMA_CQMR                   0xa00
  51 #define FSL_QDMA_CQDSCR1                0xa08
  52 #define FSL_QDMA_CQDSCR2                0xa0c
  53 #define FSL_QDMA_CQIER                  0xa10
  54 #define FSL_QDMA_CQEDR                  0xa14
  55 #define FSL_QDMA_SQCCMR                 0xa20
  56
  57 /* Registers for bit and genmask */
  58 #define FSL_QDMA_CQIDR_SQT              BIT(15)
  59 #define QDMA_CCDF_FOTMAT                BIT(29)
  60 #define QDMA_CCDF_SER                   BIT(30)
  61 #define QDMA_SG_FIN                     BIT(30)
  62 #define QDMA_SG_LEN_MASK                GENMASK(29, 0)
  63 #define QDMA_CCDF_MASK                  GENMASK(28, 20)
  64
  65 #define FSL_QDMA_DEDR_CLEAR             GENMASK(31, 0)
  66 #define FSL_QDMA_BCQIDR_CLEAR           GENMASK(31, 0)
  67 #define FSL_QDMA_DEIER_CLEAR            GENMASK(31, 0)
  68
  69 #define FSL_QDMA_BCQIER_CQTIE           BIT(15)
  70 #define FSL_QDMA_BCQIER_CQPEIE          BIT(23)
  71 #define FSL_QDMA_BSQICR_ICEN            BIT(31)
  72
  73 #define FSL_QDMA_BSQICR_ICST(x)         ((x) << 16)
  74 #define FSL_QDMA_CQIER_MEIE             BIT(31)
  75 #define FSL_QDMA_CQIER_TEIE             BIT(0)
  76 #define FSL_QDMA_SQCCMR_ENTER_WM        BIT(21)
  77
  78 #define FSL_QDMA_BCQMR_EN               BIT(31)
  79 #define FSL_QDMA_BCQMR_EI               BIT(30)
  80 #define FSL_QDMA_BCQMR_CD_THLD(x)       ((x) << 20)
  81 #define FSL_QDMA_BCQMR_CQ_SIZE(x)       ((x) << 16)
  82
  83 #define FSL_QDMA_BCQSR_QF               BIT(16)
  84 #define FSL_QDMA_BCQSR_XOFF             BIT(0)
  85
  86 #define FSL_QDMA_BSQMR_EN               BIT(31)
  87 #define FSL_QDMA_BSQMR_DI               BIT(30)
  88 #define FSL_QDMA_BSQMR_CQ_SIZE(x)       ((x) << 16)
  89
  90 #define FSL_QDMA_BSQSR_QE               BIT(17)
  91
  92 #define FSL_QDMA_DMR_DQD                BIT(30)
  93 #define FSL_QDMA_DSR_DB         BIT(31)
  94
  95 /* Size related definition */
  96 #define FSL_QDMA_QUEUE_MAX              8
  97 #define FSL_QDMA_COMMAND_BUFFER_SIZE    64
  98 #define FSL_QDMA_DESCRIPTOR_BUFFER_SIZE 32
  99 #define FSL_QDMA_CIRCULAR_DESC_SIZE_MIN 64
 100 #define FSL_QDMA_CIRCULAR_DESC_SIZE_MAX 16384
 101 #define FSL_QDMA_QUEUE_NUM_MAX          8
 102
 103 /* Field definition for CMD */
 104 #define FSL_QDMA_CMD_RWTTYPE            0x4
 105 #define FSL_QDMA_CMD_LWC                0x2
 106 #define FSL_QDMA_CMD_RWTTYPE_OFFSET     28
 107 #define FSL_QDMA_CMD_NS_OFFSET          27
 108 #define FSL_QDMA_CMD_DQOS_OFFSET        24
 109 #define FSL_QDMA_CMD_WTHROTL_OFFSET     20
 110 #define FSL_QDMA_CMD_DSEN_OFFSET        19
 111 #define FSL_QDMA_CMD_LWC_OFFSET         16
 112
 113 /* Field definition for Descriptor offset */
 114 #define QDMA_CCDF_STATUS                20
 115 #define QDMA_CCDF_OFFSET                20
 116
 117 /* Field definition for safe loop count*/
 118 #define FSL_QDMA_HALT_COUNT             1500
 119 #define FSL_QDMA_MAX_SIZE               16385
 120 #define FSL_QDMA_COMP_TIMEOUT           1000
 121 #define FSL_COMMAND_QUEUE_OVERFLLOW     10
 122
 123 #define FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma_engine, x)                  \
 124         (((fsl_qdma_engine)->block_offset) * (x))
 125
 126 /**
 127  * struct fsl_qdma_format - This is the struct holding describing compound
 128  *                          descriptor format with qDMA.
 129  * @status:                 Command status and enqueue status notification.
 130  * @cfg:                    Frame offset and frame format.
 131  * @addr_lo:                Holding the compound descriptor of the lower
 132  *                          32-bits address in memory 40-bit address.
 133  * @addr_hi:                Same as above member, but point high 8-bits in
 134  *                          memory 40-bit address.
 135  * @__reserved1:            Reserved field.
 136  * @cfg8b_w1:               Compound descriptor command queue origin produced
 137  *                          by qDMA and dynamic debug field.
 138  * @data                    Pointer to the memory 40-bit address, describes DMA
 139  *                          source information and DMA destination information.
 140  */
 141 struct fsl_qdma_format {
 142         __le32 status;
 143         __le32 cfg;
 144         union {
 145                 struct {
 146                         __le32 addr_lo;
 147                         u8 addr_hi;
 148                         u8 __reserved1[2];
 149                         u8 cfg8b_w1;
 150                 } __packed;
 151                 __le64 data;
 152         };
 153 } __packed;
 154
 155 /* qDMA status notification pre information */
 156 struct fsl_pre_status {
 157         u64 addr;
 158         u8 queue;
 159 };
 160
 161 static DEFINE_PER_CPU(struct fsl_pre_status, pre);
 162
 163 struct fsl_qdma_chan {
 164         struct virt_dma_chan            vchan;
 165         struct virt_dma_desc            vdesc;
 166         enum dma_status                 status;
 167         struct fsl_qdma_engine          *qdma;
 168         struct fsl_qdma_queue           *queue;
 169 };
 170
 171 struct fsl_qdma_queue {
 172         struct fsl_qdma_format  *virt_head;
 173         struct fsl_qdma_format  *virt_tail;
 174         struct list_head        comp_used;
 175         struct list_head        comp_free;
 176         struct dma_pool         *comp_pool;
 177         struct dma_pool         *desc_pool;
 178         spinlock_t              queue_lock;
 179         dma_addr_t              bus_addr;
 180         u32                     n_cq;
 181         u32                     id;
 182         struct fsl_qdma_format  *cq;
 183         void __iomem            *block_base;
 184 };
 185
 186 struct fsl_qdma_comp {
 187         dma_addr_t              bus_addr;
 188         dma_addr_t              desc_bus_addr;
 189         struct fsl_qdma_format  *virt_addr;
 190         struct fsl_qdma_format  *desc_virt_addr;
 191         struct fsl_qdma_chan    *qchan;
 192         struct virt_dma_desc    vdesc;
 193         struct list_head        list;
 194 };
 195
 196 struct fsl_qdma_engine {
 197         struct dma_device       dma_dev;
 198         void __iomem            *ctrl_base;
 199         void __iomem            *status_base;
 200         void __iomem            *block_base;
 201         u32                     n_chans;
 202         u32                     n_queues;
 203         struct mutex            fsl_qdma_mutex;
 204         int                     error_irq;
 205         int                     *queue_irq;
 206         u32                     feature;
 207         struct fsl_qdma_queue   *queue;
 208         struct fsl_qdma_queue   **status;
 209         struct fsl_qdma_chan    *chans;
 210         int                     block_number;
 211         int                     block_offset;
 212         int                     irq_base;
 213         int                     desc_allocated;
 214
 215 };
 216
 217 static inline u64
 218 qdma_ccdf_addr_get64(const struct fsl_qdma_format *ccdf)
 219 {
 220         return le64_to_cpu(ccdf->data) & (U64_MAX >> 24);
 221 }
 222
 223 static inline void
 224 qdma_desc_addr_set64(struct fsl_qdma_format *ccdf, u64 addr)
 225 {
 226         ccdf->addr_hi = upper_32_bits(addr);
 227         ccdf->addr_lo = cpu_to_le32(lower_32_bits(addr));
 228 }
 229
 230 static inline u8
 231 qdma_ccdf_get_queue(const struct fsl_qdma_format *ccdf)
 232 {
 233         return ccdf->cfg8b_w1 & U8_MAX;
 234 }
 235
 236 static inline int
 237 qdma_ccdf_get_offset(const struct fsl_qdma_format *ccdf)
 238 {
 239         return (le32_to_cpu(ccdf->cfg) & QDMA_CCDF_MASK) >> QDMA_CCDF_OFFSET;
 240 }
 241
 242 static inline void
 243 qdma_ccdf_set_format(struct fsl_qdma_format *ccdf, int offset)
 244 {
 245         ccdf->cfg = cpu_to_le32(QDMA_CCDF_FOTMAT | offset);
 246 }
 247
 248 static inline int
 249 qdma_ccdf_get_status(const struct fsl_qdma_format *ccdf)
 250 {
 251         return (le32_to_cpu(ccdf->status) & QDMA_CCDF_MASK) >> QDMA_CCDF_STATUS;
 252 }
 253
 254 static inline void
 255 qdma_ccdf_set_ser(struct fsl_qdma_format *ccdf, int status)
 256 {
 257         ccdf->status = cpu_to_le32(QDMA_CCDF_SER | status);
 258 }
 259
 260 static inline void qdma_csgf_set_len(struct fsl_qdma_format *csgf, int len)
 261 {
 262         csgf->cfg = cpu_to_le32(len & QDMA_SG_LEN_MASK);
 263 }
 264
 265 static inline void qdma_csgf_set_f(struct fsl_qdma_format *csgf, int len)
 266 {
 267         csgf->cfg = cpu_to_le32(QDMA_SG_FIN | (len & QDMA_SG_LEN_MASK));
 268 }
 269
 270 static u32 qdma_readl(struct fsl_qdma_engine *qdma, void __iomem *addr)
 271 {
 272         return FSL_DMA_IN(qdma, addr, 32);
 273 }
 274
 275 static void qdma_writel(struct fsl_qdma_engine *qdma, u32 val,
 276                         void __iomem *addr)
 277 {
 278         FSL_DMA_OUT(qdma, addr, val, 32);
 279 }
 280
 281 static struct fsl_qdma_chan *to_fsl_qdma_chan(struct dma_chan *chan)
 282 {
 283         return container_of(chan, struct fsl_qdma_chan, vchan.chan);
 284 }
 285
 286 static struct fsl_qdma_comp *to_fsl_qdma_comp(struct virt_dma_desc *vd)
 287 {
 288         return container_of(vd, struct fsl_qdma_comp, vdesc);
 289 }
 290
 291 static void fsl_qdma_free_chan_resources(struct dma_chan *chan)
 292 {
 293         struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
 294         struct fsl_qdma_queue *fsl_queue = fsl_chan->queue;
 295         struct fsl_qdma_engine *fsl_qdma = fsl_chan->qdma;
 296         struct fsl_qdma_comp *comp_temp, *_comp_temp;
 297         unsigned long flags;
 298         LIST_HEAD(head);
 299
 300         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 301         vchan_get_all_descriptors(&fsl_chan->vchan, &head);
 302         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 303
 304         vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
 305
 306         if (!fsl_queue->comp_pool && !fsl_queue->comp_pool)
 307                 return;
 308
 309         list_for_each_entry_safe(comp_temp, _comp_temp,
 310                                  &fsl_queue->comp_used, list) {
 311                 dma_pool_free(fsl_queue->comp_pool,
 312                               comp_temp->virt_addr,
 313                               comp_temp->bus_addr);
 314                 dma_pool_free(fsl_queue->desc_pool,
 315                               comp_temp->desc_virt_addr,
 316                               comp_temp->desc_bus_addr);
 317                 list_del(&comp_temp->list);
 318                 kfree(comp_temp);
 319         }
 320
 321         list_for_each_entry_safe(comp_temp, _comp_temp,
 322                                  &fsl_queue->comp_free, list) {
 323                 dma_pool_free(fsl_queue->comp_pool,
 324                               comp_temp->virt_addr,
 325                               comp_temp->bus_addr);
 326                 dma_pool_free(fsl_queue->desc_pool,
 327                               comp_temp->desc_virt_addr,
 328                               comp_temp->desc_bus_addr);
 329                 list_del(&comp_temp->list);
 330                 kfree(comp_temp);
 331         }
 332
 333         dma_pool_destroy(fsl_queue->comp_pool);
 334         dma_pool_destroy(fsl_queue->desc_pool);
 335
 336         fsl_qdma->desc_allocated--;
 337         fsl_queue->comp_pool = NULL;
 338         fsl_queue->desc_pool = NULL;
 339 }
 340
 341 static void fsl_qdma_comp_fill_memcpy(struct fsl_qdma_comp *fsl_comp,
 342                                       dma_addr_t dst, dma_addr_t src, u32 len)
 343 {
 344         struct fsl_qdma_format *sdf, *ddf;
 345         struct fsl_qdma_format *ccdf, *csgf_desc, *csgf_src, *csgf_dest;
 346
 347         ccdf = fsl_comp->virt_addr;
 348         csgf_desc = fsl_comp->virt_addr + 1;
 349         csgf_src = fsl_comp->virt_addr + 2;
 350         csgf_dest = fsl_comp->virt_addr + 3;
 351         sdf = fsl_comp->desc_virt_addr;
 352         ddf = fsl_comp->desc_virt_addr + 1;
 353
 354         memset(fsl_comp->virt_addr, 0, FSL_QDMA_COMMAND_BUFFER_SIZE);
 355         memset(fsl_comp->desc_virt_addr, 0, FSL_QDMA_DESCRIPTOR_BUFFER_SIZE);
 356         /* Head Command Descriptor(Frame Descriptor) */
 357         qdma_desc_addr_set64(ccdf, fsl_comp->bus_addr + 16);
 358         qdma_ccdf_set_format(ccdf, qdma_ccdf_get_offset(ccdf));
 359         qdma_ccdf_set_ser(ccdf, qdma_ccdf_get_status(ccdf));
 360         /* Status notification is enqueued to status queue. */
 361         /* Compound Command Descriptor(Frame List Table) */
 362         qdma_desc_addr_set64(csgf_desc, fsl_comp->desc_bus_addr);
 363         /* It must be 32 as Compound S/G Descriptor */
 364         qdma_csgf_set_len(csgf_desc, 32);
 365         qdma_desc_addr_set64(csgf_src, src);
 366         qdma_csgf_set_len(csgf_src, len);
 367         qdma_desc_addr_set64(csgf_dest, dst);
 368         qdma_csgf_set_len(csgf_dest, len);
 369         /* This entry is the last entry. */
 370         qdma_csgf_set_f(csgf_dest, len);
 371         /* Descriptor Buffer */
 372         sdf->data =
 373                 cpu_to_le64(FSL_QDMA_CMD_RWTTYPE <<
 374                             FSL_QDMA_CMD_RWTTYPE_OFFSET);
 375         ddf->data =
 376                 cpu_to_le64(FSL_QDMA_CMD_RWTTYPE <<
 377                             FSL_QDMA_CMD_RWTTYPE_OFFSET);
 378         ddf->data |=
 379                 cpu_to_le64(FSL_QDMA_CMD_LWC << FSL_QDMA_CMD_LWC_OFFSET);
 380 }
 381
 382 /*
 383  * Pre-request full command descriptor for enqueue.
 384  */
 385 static int fsl_qdma_pre_request_enqueue_desc(struct fsl_qdma_queue *queue)
 386 {
 387         int i;
 388         struct fsl_qdma_comp *comp_temp, *_comp_temp;
 389
 390         for (i = 0; i < queue->n_cq + FSL_COMMAND_QUEUE_OVERFLLOW; i++) {
 391                 comp_temp = kzalloc(sizeof(*comp_temp), GFP_KERNEL);
 392                 if (!comp_temp)
 393                         goto err_alloc;
 394                 comp_temp->virt_addr =
 395                         dma_pool_alloc(queue->comp_pool, GFP_KERNEL,
 396                                        &comp_temp->bus_addr);
 397                 if (!comp_temp->virt_addr)
 398                         goto err_dma_alloc;
 399
 400                 comp_temp->desc_virt_addr =
 401                         dma_pool_alloc(queue->desc_pool, GFP_KERNEL,
 402                                        &comp_temp->desc_bus_addr);
 403                 if (!comp_temp->desc_virt_addr)
 404                         goto err_desc_dma_alloc;
 405
 406                 list_add_tail(&comp_temp->list, &queue->comp_free);
 407         }
 408
 409         return 0;
 410
 411 err_desc_dma_alloc:
 412         dma_pool_free(queue->comp_pool, comp_temp->virt_addr,
 413                       comp_temp->bus_addr);
 414
 415 err_dma_alloc:
 416         kfree(comp_temp);
 417
 418 err_alloc:
 419         list_for_each_entry_safe(comp_temp, _comp_temp,
 420                                  &queue->comp_free, list) {
 421                 if (comp_temp->virt_addr)
 422                         dma_pool_free(queue->comp_pool,
 423                                       comp_temp->virt_addr,
 424                                       comp_temp->bus_addr);
 425                 if (comp_temp->desc_virt_addr)
 426                         dma_pool_free(queue->desc_pool,
 427                                       comp_temp->desc_virt_addr,
 428                                       comp_temp->desc_bus_addr);
 429
 430                 list_del(&comp_temp->list);
 431                 kfree(comp_temp);
 432         }
 433
 434         return -ENOMEM;
 435 }
 436
 437 /*
 438  * Request a command descriptor for enqueue.
 439  */
 440 static struct fsl_qdma_comp
 441 *fsl_qdma_request_enqueue_desc(struct fsl_qdma_chan *fsl_chan)
 442 {
 443         unsigned long flags;
 444         struct fsl_qdma_comp *comp_temp;
 445         int timeout = FSL_QDMA_COMP_TIMEOUT;
 446         struct fsl_qdma_queue *queue = fsl_chan->queue;
 447
 448         while (timeout--) {
 449                 spin_lock_irqsave(&queue->queue_lock, flags);
 450                 if (!list_empty(&queue->comp_free)) {
 451                         comp_temp = list_first_entry(&queue->comp_free,
 452                                                      struct fsl_qdma_comp,
 453                                                      list);
 454                         list_del(&comp_temp->list);
 455
 456                         spin_unlock_irqrestore(&queue->queue_lock, flags);
 457                         comp_temp->qchan = fsl_chan;
 458                         return comp_temp;
 459                 }
 460                 spin_unlock_irqrestore(&queue->queue_lock, flags);
 461                 udelay(1);
 462         }
 463
 464         return NULL;
 465 }
 466
 467 static struct fsl_qdma_queue
 468 *fsl_qdma_alloc_queue_resources(struct platform_device *pdev,
 469                                 struct fsl_qdma_engine *fsl_qdma)
 470 {
 471         int ret, len, i, j;
 472         int queue_num, block_number;
 473         unsigned int queue_size[FSL_QDMA_QUEUE_MAX];
 474         struct fsl_qdma_queue *queue_head, *queue_temp;
 475
 476         queue_num = fsl_qdma->n_queues;
 477         block_number = fsl_qdma->block_number;
 478
 479         if (queue_num > FSL_QDMA_QUEUE_MAX)
 480                 queue_num = FSL_QDMA_QUEUE_MAX;
 481         len = sizeof(*queue_head) * queue_num * block_number;
 482         queue_head = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
 483         if (!queue_head)
 484                 return NULL;
 485
 486         ret = device_property_read_u32_array(&pdev->dev, "queue-sizes",
 487                                              queue_size, queue_num);
 488         if (ret) {
 489                 dev_err(&pdev->dev, "Can't get queue-sizes.\n");
 490                 return NULL;
 491         }
 492         for (j = 0; j < block_number; j++) {
 493                 for (i = 0; i < queue_num; i++) {
 494                         if (queue_size[i] > FSL_QDMA_CIRCULAR_DESC_SIZE_MAX ||
 495                             queue_size[i] < FSL_QDMA_CIRCULAR_DESC_SIZE_MIN) {
 496                                 dev_err(&pdev->dev,
 497                                         "Get wrong queue-sizes.\n");
 498                                 return NULL;
 499                         }
 500                         queue_temp = queue_head + i + (j * queue_num);
 501
 502                         queue_temp->cq =
 503                         dma_alloc_coherent(&pdev->dev,
 504                                            sizeof(struct fsl_qdma_format) *
 505                                            queue_size[i],
 506                                            &queue_temp->bus_addr,
 507                                            GFP_KERNEL);
 508                         if (!queue_temp->cq)
 509                                 return NULL;
 510                         queue_temp->block_base = fsl_qdma->block_base +
 511                                 FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, j);
 512                         queue_temp->n_cq = queue_size[i];
 513                         queue_temp->id = i;
 514                         queue_temp->virt_head = queue_temp->cq;
 515                         queue_temp->virt_tail = queue_temp->cq;
 516                         /*
 517                          * List for queue command buffer
 518                          */
 519                         INIT_LIST_HEAD(&queue_temp->comp_used);
 520                         spin_lock_init(&queue_temp->queue_lock);
 521                 }
 522         }
 523         return queue_head;
 524 }
 525
 526 static struct fsl_qdma_queue
 527 *fsl_qdma_prep_status_queue(struct platform_device *pdev)
 528 {
 529         int ret;
 530         unsigned int status_size;
 531         struct fsl_qdma_queue *status_head;
 532         struct device_node *np = pdev->dev.of_node;
 533
 534         ret = of_property_read_u32(np, "status-sizes", &status_size);
 535         if (ret) {
 536                 dev_err(&pdev->dev, "Can't get status-sizes.\n");
 537                 return NULL;
 538         }
 539         if (status_size > FSL_QDMA_CIRCULAR_DESC_SIZE_MAX ||
 540             status_size < FSL_QDMA_CIRCULAR_DESC_SIZE_MIN) {
 541                 dev_err(&pdev->dev, "Get wrong status_size.\n");
 542                 return NULL;
 543         }
 544         status_head = devm_kzalloc(&pdev->dev,
 545                                    sizeof(*status_head), GFP_KERNEL);
 546         if (!status_head)
 547                 return NULL;
 548
 549         /*
 550          * Buffer for queue command
 551          */
 552         status_head->cq = dma_alloc_coherent(&pdev->dev,
 553                                              sizeof(struct fsl_qdma_format) *
 554                                              status_size,
 555                                              &status_head->bus_addr,
 556                                              GFP_KERNEL);
 557         if (!status_head->cq) {
 558                 devm_kfree(&pdev->dev, status_head);
 559                 return NULL;
 560         }
 561         status_head->n_cq = status_size;
 562         status_head->virt_head = status_head->cq;
 563         status_head->virt_tail = status_head->cq;
 564         status_head->comp_pool = NULL;
 565
 566         return status_head;
 567 }
 568
 569 static int fsl_qdma_halt(struct fsl_qdma_engine *fsl_qdma)
 570 {
 571         u32 reg;
 572         int i, j, count = FSL_QDMA_HALT_COUNT;
 573         void __iomem *block, *ctrl = fsl_qdma->ctrl_base;
 574
 575         /* Disable the command queue and wait for idle state. */
 576         reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DMR);
 577         reg |= FSL_QDMA_DMR_DQD;
 578         qdma_writel(fsl_qdma, reg, ctrl + FSL_QDMA_DMR);
 579         for (j = 0; j < fsl_qdma->block_number; j++) {
 580                 block = fsl_qdma->block_base +
 581                         FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, j);
 582                 for (i = 0; i < FSL_QDMA_QUEUE_NUM_MAX; i++)
 583                         qdma_writel(fsl_qdma, 0, block + FSL_QDMA_BCQMR(i));
 584         }
 585         while (1) {
 586                 reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DSR);
 587                 if (!(reg & FSL_QDMA_DSR_DB))
 588                         break;
 589                 if (count-- < 0)
 590                         return -EBUSY;
 591                 udelay(100);
 592         }
 593
 594         for (j = 0; j < fsl_qdma->block_number; j++) {
 595                 block = fsl_qdma->block_base +
 596                         FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, j);
 597
 598                 /* Disable status queue. */
 599                 qdma_writel(fsl_qdma, 0, block + FSL_QDMA_BSQMR);
 600
 601                 /*
 602                  * clear the command queue interrupt detect register for
 603                  * all queues.
 604                  */
 605                 qdma_writel(fsl_qdma, FSL_QDMA_BCQIDR_CLEAR,
 606                             block + FSL_QDMA_BCQIDR(0));
 607         }
 608
 609         return 0;
 610 }
 611
 612 static int
 613 fsl_qdma_queue_transfer_complete(struct fsl_qdma_engine *fsl_qdma,
 614                                  void *block,
 615                                  int id)
 616 {
 617         bool duplicate;
 618         u32 reg, i, count;
 619         struct fsl_qdma_queue *temp_queue;
 620         struct fsl_qdma_format *status_addr;
 621         struct fsl_qdma_comp *fsl_comp = NULL;
 622         struct fsl_qdma_queue *fsl_queue = fsl_qdma->queue;
 623         struct fsl_qdma_queue *fsl_status = fsl_qdma->status[id];
 624
 625         count = FSL_QDMA_MAX_SIZE;
 626
 627         while (count--) {
 628                 duplicate = 0;
 629                 reg = qdma_readl(fsl_qdma, block + FSL_QDMA_BSQSR);
 630                 if (reg & FSL_QDMA_BSQSR_QE)
 631                         return 0;
 632
 633                 status_addr = fsl_status->virt_head;
 634
 635                 if (qdma_ccdf_get_queue(status_addr) ==
 636                    __this_cpu_read(pre.queue) &&
 637                         qdma_ccdf_addr_get64(status_addr) ==
 638                         __this_cpu_read(pre.addr))
 639                         duplicate = 1;
 640                 i = qdma_ccdf_get_queue(status_addr) +
 641                         id * fsl_qdma->n_queues;
 642                 __this_cpu_write(pre.addr, qdma_ccdf_addr_get64(status_addr));
 643                 __this_cpu_write(pre.queue, qdma_ccdf_get_queue(status_addr));
 644                 temp_queue = fsl_queue + i;
 645
 646                 spin_lock(&temp_queue->queue_lock);
 647                 if (list_empty(&temp_queue->comp_used)) {
 648                         if (!duplicate) {
 649                                 spin_unlock(&temp_queue->queue_lock);
 650                                 return -EAGAIN;
 651                         }
 652                 } else {
 653                         fsl_comp = list_first_entry(&temp_queue->comp_used,
 654                                                     struct fsl_qdma_comp, list);
 655                         if (fsl_comp->bus_addr + 16 !=
 656                                 __this_cpu_read(pre.addr)) {
 657                                 if (!duplicate) {
 658                                         spin_unlock(&temp_queue->queue_lock);
 659                                         return -EAGAIN;
 660                                 }
 661                         }
 662                 }
 663
 664                 if (duplicate) {
 665                         reg = qdma_readl(fsl_qdma, block + FSL_QDMA_BSQMR);
 666                         reg |= FSL_QDMA_BSQMR_DI;
 667                         qdma_desc_addr_set64(status_addr, 0x0);
 668                         fsl_status->virt_head++;
 669                         if (fsl_status->virt_head == fsl_status->cq
 670                                                    + fsl_status->n_cq)
 671                                 fsl_status->virt_head = fsl_status->cq;
 672                         qdma_writel(fsl_qdma, reg, block + FSL_QDMA_BSQMR);
 673                         spin_unlock(&temp_queue->queue_lock);
 674                         continue;
 675                 }
 676                 list_del(&fsl_comp->list);
 677
 678                 reg = qdma_readl(fsl_qdma, block + FSL_QDMA_BSQMR);
 679                 reg |= FSL_QDMA_BSQMR_DI;
 680                 qdma_desc_addr_set64(status_addr, 0x0);
 681                 fsl_status->virt_head++;
 682                 if (fsl_status->virt_head == fsl_status->cq + fsl_status->n_cq)
 683                         fsl_status->virt_head = fsl_status->cq;
 684                 qdma_writel(fsl_qdma, reg, block + FSL_QDMA_BSQMR);
 685                 spin_unlock(&temp_queue->queue_lock);
 686
 687                 spin_lock(&fsl_comp->qchan->vchan.lock);
 688                 vchan_cookie_complete(&fsl_comp->vdesc);
 689                 fsl_comp->qchan->status = DMA_COMPLETE;
 690                 spin_unlock(&fsl_comp->qchan->vchan.lock);
 691         }
 692
 693         return 0;
 694 }
 695
 696 static irqreturn_t fsl_qdma_error_handler(int irq, void *dev_id)
 697 {
 698         unsigned int intr;
 699         struct fsl_qdma_engine *fsl_qdma = dev_id;
 700         void __iomem *status = fsl_qdma->status_base;
 701
 702         intr = qdma_readl(fsl_qdma, status + FSL_QDMA_DEDR);
 703
 704         if (intr) {
 705                 dev_err(fsl_qdma->dma_dev.dev, "DMA transaction error!\n");
 706                 return IRQ_NONE;
 707         }
 708
 709         qdma_writel(fsl_qdma, FSL_QDMA_DEDR_CLEAR, status + FSL_QDMA_DEDR);
 710         return IRQ_HANDLED;
 711 }
 712
 713 static irqreturn_t fsl_qdma_queue_handler(int irq, void *dev_id)
 714 {
 715         int id;
 716         unsigned int intr, reg;
 717         struct fsl_qdma_engine *fsl_qdma = dev_id;
 718         void __iomem *block, *ctrl = fsl_qdma->ctrl_base;
 719
 720         id = irq - fsl_qdma->irq_base;
 721         if (id < 0 && id > fsl_qdma->block_number) {
 722                 dev_err(fsl_qdma->dma_dev.dev,
 723                         "irq %d is wrong irq_base is %d\n",
 724                         irq, fsl_qdma->irq_base);
 725         }
 726
 727         block = fsl_qdma->block_base +
 728                 FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, id);
 729
 730         intr = qdma_readl(fsl_qdma, block + FSL_QDMA_BCQIDR(0));
 731
 732         if ((intr & FSL_QDMA_CQIDR_SQT) != 0)
 733                 intr = fsl_qdma_queue_transfer_complete(fsl_qdma, block, id);
 734
 735         if (intr != 0) {
 736                 reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DMR);
 737                 reg |= FSL_QDMA_DMR_DQD;
 738                 qdma_writel(fsl_qdma, reg, ctrl + FSL_QDMA_DMR);
 739                 qdma_writel(fsl_qdma, 0, block + FSL_QDMA_BCQIER(0));
 740                 dev_err(fsl_qdma->dma_dev.dev, "QDMA: status err!\n");
 741         }
 742
 743         /* Clear all detected events and interrupts. */
 744         qdma_writel(fsl_qdma, FSL_QDMA_BCQIDR_CLEAR,
 745                     block + FSL_QDMA_BCQIDR(0));
 746
 747         return IRQ_HANDLED;
 748 }
 749
 750 static int
 751 fsl_qdma_irq_init(struct platform_device *pdev,
 752                   struct fsl_qdma_engine *fsl_qdma)
 753 {
 754         int i;
 755         int cpu;
 756         int ret;
 757         char irq_name[20];
 758
 759         fsl_qdma->error_irq =
 760                 platform_get_irq_byname(pdev, "qdma-error");
 761         if (fsl_qdma->error_irq < 0) {
 762                 dev_err(&pdev->dev, "Can't get qdma controller irq.\n");
 763                 return fsl_qdma->error_irq;
 764         }
 765
 766         ret = devm_request_irq(&pdev->dev, fsl_qdma->error_irq,
 767                                fsl_qdma_error_handler, 0,
 768                                "qDMA error", fsl_qdma);
 769         if (ret) {
 770                 dev_err(&pdev->dev, "Can't register qDMA controller IRQ.\n");
 771                 return  ret;
 772         }
 773
 774         for (i = 0; i < fsl_qdma->block_number; i++) {
 775                 sprintf(irq_name, "qdma-queue%d", i);
 776                 fsl_qdma->queue_irq[i] =
 777                                 platform_get_irq_byname(pdev, irq_name);
 778
 779                 if (fsl_qdma->queue_irq[i] < 0) {
 780                         dev_err(&pdev->dev,
 781                                 "Can't get qdma queue %d irq.\n", i);
 782                         return fsl_qdma->queue_irq[i];
 783                 }
 784
 785                 ret = devm_request_irq(&pdev->dev,
 786                                        fsl_qdma->queue_irq[i],
 787                                        fsl_qdma_queue_handler,
 788                                        0,
 789                                        "qDMA queue",
 790                                        fsl_qdma);
 791                 if (ret) {
 792                         dev_err(&pdev->dev,
 793                                 "Can't register qDMA queue IRQ.\n");
 794                         return  ret;
 795                 }
 796
 797                 cpu = i % num_online_cpus();
 798                 ret = irq_set_affinity_hint(fsl_qdma->queue_irq[i],
 799                                             get_cpu_mask(cpu));
 800                 if (ret) {
 801                         dev_err(&pdev->dev,
 802                                 "Can't set cpu %d affinity to IRQ %d.\n",
 803                                 cpu,
 804                                 fsl_qdma->queue_irq[i]);
 805                         return  ret;
 806                 }
 807         }
 808
 809         return 0;
 810 }
 811
 812 static void fsl_qdma_irq_exit(struct platform_device *pdev,
 813                               struct fsl_qdma_engine *fsl_qdma)
 814 {
 815         int i;
 816
 817         devm_free_irq(&pdev->dev, fsl_qdma->error_irq, fsl_qdma);
 818         for (i = 0; i < fsl_qdma->block_number; i++)
 819                 devm_free_irq(&pdev->dev, fsl_qdma->queue_irq[i], fsl_qdma);
 820 }
 821
 822 static int fsl_qdma_reg_init(struct fsl_qdma_engine *fsl_qdma)
 823 {
 824         u32 reg;
 825         int i, j, ret;
 826         struct fsl_qdma_queue *temp;
 827         void __iomem *status = fsl_qdma->status_base;
 828         void __iomem *block, *ctrl = fsl_qdma->ctrl_base;
 829         struct fsl_qdma_queue *fsl_queue = fsl_qdma->queue;
 830
 831         /* Try to halt the qDMA engine first. */
 832         ret = fsl_qdma_halt(fsl_qdma);
 833         if (ret) {
 834                 dev_err(fsl_qdma->dma_dev.dev, "DMA halt failed!");
 835                 return ret;
 836         }
 837
 838         for (i = 0; i < fsl_qdma->block_number; i++) {
 839                 /*
 840                  * Clear the command queue interrupt detect register for
 841                  * all queues.
 842                  */
 843
 844                 block = fsl_qdma->block_base +
 845                         FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, i);
 846                 qdma_writel(fsl_qdma, FSL_QDMA_BCQIDR_CLEAR,
 847                             block + FSL_QDMA_BCQIDR(0));
 848         }
 849
 850         for (j = 0; j < fsl_qdma->block_number; j++) {
 851                 block = fsl_qdma->block_base +
 852                         FSL_QDMA_BLOCK_BASE_OFFSET(fsl_qdma, j);
 853                 for (i = 0; i < fsl_qdma->n_queues; i++) {
 854                         temp = fsl_queue + i + (j * fsl_qdma->n_queues);
 855                         /*
 856                          * Initialize Command Queue registers to
 857                          * point to the first
 858                          * command descriptor in memory.
 859                          * Dequeue Pointer Address Registers
 860                          * Enqueue Pointer Address Registers
 861                          */
 862
 863                         qdma_writel(fsl_qdma, temp->bus_addr,
 864                                     block + FSL_QDMA_BCQDPA_SADDR(i));
 865                         qdma_writel(fsl_qdma, temp->bus_addr,
 866                                     block + FSL_QDMA_BCQEPA_SADDR(i));
 867
 868                         /* Initialize the queue mode. */
 869                         reg = FSL_QDMA_BCQMR_EN;
 870                         reg |= FSL_QDMA_BCQMR_CD_THLD(ilog2(temp->n_cq) - 4);
 871                         reg |= FSL_QDMA_BCQMR_CQ_SIZE(ilog2(temp->n_cq) - 6);
 872                         qdma_writel(fsl_qdma, reg, block + FSL_QDMA_BCQMR(i));
 873                 }
 874
 875                 /*
 876                  * Workaround for erratum: ERR010812.
 877                  * We must enable XOFF to avoid the enqueue rejection occurs.
 878                  * Setting SQCCMR ENTER_WM to 0x20.
 879                  */
 880
 881                 qdma_writel(fsl_qdma, FSL_QDMA_SQCCMR_ENTER_WM,
 882                             block + FSL_QDMA_SQCCMR);
 883
 884                 /*
 885                  * Initialize status queue registers to point to the first
 886                  * command descriptor in memory.
 887                  * Dequeue Pointer Address Registers
 888                  * Enqueue Pointer Address Registers
 889                  */
 890
 891                 qdma_writel(fsl_qdma, fsl_qdma->status[j]->bus_addr,
 892                             block + FSL_QDMA_SQEPAR);
 893                 qdma_writel(fsl_qdma, fsl_qdma->status[j]->bus_addr,
 894                             block + FSL_QDMA_SQDPAR);
 895                 /* Initialize status queue interrupt. */
 896                 qdma_writel(fsl_qdma, FSL_QDMA_BCQIER_CQTIE,
 897                             block + FSL_QDMA_BCQIER(0));
 898                 qdma_writel(fsl_qdma, FSL_QDMA_BSQICR_ICEN |
 899                                    FSL_QDMA_BSQICR_ICST(5) | 0x8000,
 900                                    block + FSL_QDMA_BSQICR);
 901                 qdma_writel(fsl_qdma, FSL_QDMA_CQIER_MEIE |
 902                                    FSL_QDMA_CQIER_TEIE,
 903                                    block + FSL_QDMA_CQIER);
 904
 905                 /* Initialize the status queue mode. */
 906                 reg = FSL_QDMA_BSQMR_EN;
 907                 reg |= FSL_QDMA_BSQMR_CQ_SIZE(ilog2
 908                         (fsl_qdma->status[j]->n_cq) - 6);
 909
 910                 qdma_writel(fsl_qdma, reg, block + FSL_QDMA_BSQMR);
 911                 reg = qdma_readl(fsl_qdma, block + FSL_QDMA_BSQMR);
 912         }
 913
 914         /* Initialize controller interrupt register. */
 915         qdma_writel(fsl_qdma, FSL_QDMA_DEDR_CLEAR, status + FSL_QDMA_DEDR);
 916         qdma_writel(fsl_qdma, FSL_QDMA_DEIER_CLEAR, status + FSL_QDMA_DEIER);
 917
 918         reg = qdma_readl(fsl_qdma, ctrl + FSL_QDMA_DMR);
 919         reg &= ~FSL_QDMA_DMR_DQD;
 920         qdma_writel(fsl_qdma, reg, ctrl + FSL_QDMA_DMR);
 921
 922         return 0;
 923 }
 924
 925 static struct dma_async_tx_descriptor *
 926 fsl_qdma_prep_memcpy(struct dma_chan *chan, dma_addr_t dst,
 927                      dma_addr_t src, size_t len, unsigned long flags)
 928 {
 929         struct fsl_qdma_comp *fsl_comp;
 930         struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
 931
 932         fsl_comp = fsl_qdma_request_enqueue_desc(fsl_chan);
 933
 934         if (!fsl_comp)
 935                 return NULL;
 936
 937         fsl_qdma_comp_fill_memcpy(fsl_comp, dst, src, len);
 938
 939         return vchan_tx_prep(&fsl_chan->vchan, &fsl_comp->vdesc, flags);
 940 }
 941
 942 static void fsl_qdma_enqueue_desc(struct fsl_qdma_chan *fsl_chan)
 943 {
 944         u32 reg;
 945         struct virt_dma_desc *vdesc;
 946         struct fsl_qdma_comp *fsl_comp;
 947         struct fsl_qdma_queue *fsl_queue = fsl_chan->queue;
 948         void __iomem *block = fsl_queue->block_base;
 949
 950         reg = qdma_readl(fsl_chan->qdma, block + FSL_QDMA_BCQSR(fsl_queue->id));
 951         if (reg & (FSL_QDMA_BCQSR_QF | FSL_QDMA_BCQSR_XOFF))
 952                 return;
 953         vdesc = vchan_next_desc(&fsl_chan->vchan);
 954         if (!vdesc)
 955                 return;
 956         list_del(&vdesc->node);
 957         fsl_comp = to_fsl_qdma_comp(vdesc);
 958
 959         memcpy(fsl_queue->virt_head++,
 960                fsl_comp->virt_addr, sizeof(struct fsl_qdma_format));
 961         if (fsl_queue->virt_head == fsl_queue->cq + fsl_queue->n_cq)
 962                 fsl_queue->virt_head = fsl_queue->cq;
 963
 964         list_add_tail(&fsl_comp->list, &fsl_queue->comp_used);
 965         barrier();
 966         reg = qdma_readl(fsl_chan->qdma, block + FSL_QDMA_BCQMR(fsl_queue->id));
 967         reg |= FSL_QDMA_BCQMR_EI;
 968         qdma_writel(fsl_chan->qdma, reg, block + FSL_QDMA_BCQMR(fsl_queue->id));
 969         fsl_chan->status = DMA_IN_PROGRESS;
 970 }
 971
 972 static void fsl_qdma_free_desc(struct virt_dma_desc *vdesc)
 973 {
 974         unsigned long flags;
 975         struct fsl_qdma_comp *fsl_comp;
 976         struct fsl_qdma_queue *fsl_queue;
 977
 978         fsl_comp = to_fsl_qdma_comp(vdesc);
 979         fsl_queue = fsl_comp->qchan->queue;
 980
 981         spin_lock_irqsave(&fsl_queue->queue_lock, flags);
 982         list_add_tail(&fsl_comp->list, &fsl_queue->comp_free);
 983         spin_unlock_irqrestore(&fsl_queue->queue_lock, flags);
 984 }
 985
 986 static void fsl_qdma_issue_pending(struct dma_chan *chan)
 987 {
 988         unsigned long flags;
 989         struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
 990         struct fsl_qdma_queue *fsl_queue = fsl_chan->queue;
 991
 992         spin_lock_irqsave(&fsl_queue->queue_lock, flags);
 993         spin_lock(&fsl_chan->vchan.lock);
 994         if (vchan_issue_pending(&fsl_chan->vchan))
 995                 fsl_qdma_enqueue_desc(fsl_chan);
 996         spin_unlock(&fsl_chan->vchan.lock);
 997         spin_unlock_irqrestore(&fsl_queue->queue_lock, flags);
 998 }
 999
1000 static void fsl_qdma_synchronize(struct dma_chan *chan)
1001 {
1002         struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
1003
1004         vchan_synchronize(&fsl_chan->vchan);
1005 }
1006
1007 static int fsl_qdma_terminate_all(struct dma_chan *chan)
1008 {
1009         LIST_HEAD(head);
1010         unsigned long flags;
1011         struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
1012
1013         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
1014         vchan_get_all_descriptors(&fsl_chan->vchan, &head);
1015         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
1016         vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
1017         return 0;
1018 }
1019
1020 static int fsl_qdma_alloc_chan_resources(struct dma_chan *chan)
1021 {
1022         int ret;
1023         struct fsl_qdma_chan *fsl_chan = to_fsl_qdma_chan(chan);
1024         struct fsl_qdma_engine *fsl_qdma = fsl_chan->qdma;
1025         struct fsl_qdma_queue *fsl_queue = fsl_chan->queue;
1026
1027         if (fsl_queue->comp_pool && fsl_queue->desc_pool)
1028                 return fsl_qdma->desc_allocated;
1029
1030         INIT_LIST_HEAD(&fsl_queue->comp_free);
1031
1032         /*
1033          * The dma pool for queue command buffer
1034          */
1035         fsl_queue->comp_pool =
1036         dma_pool_create("comp_pool",
1037                         chan->device->dev,
1038                         FSL_QDMA_COMMAND_BUFFER_SIZE,
1039                         64, 0);
1040         if (!fsl_queue->comp_pool)
1041                 return -ENOMEM;
1042
1043         /*
1044          * The dma pool for Descriptor(SD/DD) buffer
1045          */
1046         fsl_queue->desc_pool =
1047         dma_pool_create("desc_pool",
1048                         chan->device->dev,
1049                         FSL_QDMA_DESCRIPTOR_BUFFER_SIZE,
1050                         32, 0);
1051         if (!fsl_queue->desc_pool)
1052                 goto err_desc_pool;
1053
1054         ret = fsl_qdma_pre_request_enqueue_desc(fsl_queue);
1055         if (ret) {
1056                 dev_err(chan->device->dev,
1057                         "failed to alloc dma buffer for S/G descriptor\n");
1058                 goto err_mem;
1059         }
1060
1061         fsl_qdma->desc_allocated++;
1062         return fsl_qdma->desc_allocated;
1063
1064 err_mem:
1065         dma_pool_destroy(fsl_queue->desc_pool);
1066 err_desc_pool:
1067         dma_pool_destroy(fsl_queue->comp_pool);
1068         return -ENOMEM;
1069 }
1070
1071 static int fsl_qdma_probe(struct platform_device *pdev)
1072 {
1073         int ret, i;
1074         int blk_num, blk_off;
1075         u32 len, chans, queues;
1076         struct resource *res;
1077         struct fsl_qdma_chan *fsl_chan;
1078         struct fsl_qdma_engine *fsl_qdma;
1079         struct device_node *np = pdev->dev.of_node;
1080
1081         ret = of_property_read_u32(np, "dma-channels", &chans);
1082         if (ret) {
1083                 dev_err(&pdev->dev, "Can't get dma-channels.\n");
1084                 return ret;
1085         }
1086
1087         ret = of_property_read_u32(np, "block-offset", &blk_off);
1088         if (ret) {
1089                 dev_err(&pdev->dev, "Can't get block-offset.\n");
1090                 return ret;
1091         }
1092
1093         ret = of_property_read_u32(np, "block-number", &blk_num);
1094         if (ret) {
1095                 dev_err(&pdev->dev, "Can't get block-number.\n");
1096                 return ret;
1097         }
1098
1099         blk_num = min_t(int, blk_num, num_online_cpus());
1100
1101         len = sizeof(*fsl_qdma);
1102         fsl_qdma = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
1103         if (!fsl_qdma)
1104                 return -ENOMEM;
1105
1106         len = sizeof(*fsl_chan) * chans;
1107         fsl_qdma->chans = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
1108         if (!fsl_qdma->chans)
1109                 return -ENOMEM;
1110
1111         len = sizeof(struct fsl_qdma_queue *) * blk_num;
1112         fsl_qdma->status = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
1113         if (!fsl_qdma->status)
1114                 return -ENOMEM;
1115
1116         len = sizeof(int) * blk_num;
1117         fsl_qdma->queue_irq = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
1118         if (!fsl_qdma->queue_irq)
1119                 return -ENOMEM;
1120
1121         ret = of_property_read_u32(np, "fsl,dma-queues", &queues);
1122         if (ret) {
1123                 dev_err(&pdev->dev, "Can't get queues.\n");
1124                 return ret;
1125         }
1126
1127         fsl_qdma->desc_allocated = 0;
1128         fsl_qdma->n_chans = chans;
1129         fsl_qdma->n_queues = queues;
1130         fsl_qdma->block_number = blk_num;
1131         fsl_qdma->block_offset = blk_off;
1132
1133         mutex_init(&fsl_qdma->fsl_qdma_mutex);
1134
1135         for (i = 0; i < fsl_qdma->block_number; i++) {
1136                 fsl_qdma->status[i] = fsl_qdma_prep_status_queue(pdev);
1137                 if (!fsl_qdma->status[i])
1138                         return -ENOMEM;
1139         }
1140         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1141         fsl_qdma->ctrl_base = devm_ioremap_resource(&pdev->dev, res);
1142         if (IS_ERR(fsl_qdma->ctrl_base))
1143                 return PTR_ERR(fsl_qdma->ctrl_base);
1144
1145         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1146         fsl_qdma->status_base = devm_ioremap_resource(&pdev->dev, res);
1147         if (IS_ERR(fsl_qdma->status_base))
1148                 return PTR_ERR(fsl_qdma->status_base);
1149
1150         res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
1151         fsl_qdma->block_base = devm_ioremap_resource(&pdev->dev, res);
1152         if (IS_ERR(fsl_qdma->block_base))
1153                 return PTR_ERR(fsl_qdma->block_base);
1154         fsl_qdma->queue = fsl_qdma_alloc_queue_resources(pdev, fsl_qdma);
1155         if (!fsl_qdma->queue)
1156                 return -ENOMEM;
1157
1158         ret = fsl_qdma_irq_init(pdev, fsl_qdma);
1159         if (ret)
1160                 return ret;
1161
1162         fsl_qdma->irq_base = platform_get_irq_byname(pdev, "qdma-queue0");
1163         fsl_qdma->feature = of_property_read_bool(np, "big-endian");
1164         INIT_LIST_HEAD(&fsl_qdma->dma_dev.channels);
1165
1166         for (i = 0; i < fsl_qdma->n_chans; i++) {
1167                 struct fsl_qdma_chan *fsl_chan = &fsl_qdma->chans[i];
1168
1169                 fsl_chan->qdma = fsl_qdma;
1170                 fsl_chan->queue = fsl_qdma->queue + i % (fsl_qdma->n_queues *
1171                                                         fsl_qdma->block_number);
1172                 fsl_chan->vchan.desc_free = fsl_qdma_free_desc;
1173                 vchan_init(&fsl_chan->vchan, &fsl_qdma->dma_dev);
1174         }
1175
1176         dma_cap_set(DMA_MEMCPY, fsl_qdma->dma_dev.cap_mask);
1177
1178         fsl_qdma->dma_dev.dev = &pdev->dev;
1179         fsl_qdma->dma_dev.device_free_chan_resources =
1180                 fsl_qdma_free_chan_resources;
1181         fsl_qdma->dma_dev.device_alloc_chan_resources =
1182                 fsl_qdma_alloc_chan_resources;
1183         fsl_qdma->dma_dev.device_tx_status = dma_cookie_status;
1184         fsl_qdma->dma_dev.device_prep_dma_memcpy = fsl_qdma_prep_memcpy;
1185         fsl_qdma->dma_dev.device_issue_pending = fsl_qdma_issue_pending;
1186         fsl_qdma->dma_dev.device_synchronize = fsl_qdma_synchronize;
1187         fsl_qdma->dma_dev.device_terminate_all = fsl_qdma_terminate_all;
1188
1189         dma_set_mask(&pdev->dev, DMA_BIT_MASK(40));
1190
1191         platform_set_drvdata(pdev, fsl_qdma);
1192
1193         ret = dma_async_device_register(&fsl_qdma->dma_dev);
1194         if (ret) {
1195                 dev_err(&pdev->dev,
1196                         "Can't register NXP Layerscape qDMA engine.\n");
1197                 return ret;
1198         }
1199
1200         ret = fsl_qdma_reg_init(fsl_qdma);
1201         if (ret) {
1202                 dev_err(&pdev->dev, "Can't Initialize the qDMA engine.\n");
1203                 return ret;
1204         }
1205
1206         return 0;
1207 }
1208
1209 static void fsl_qdma_cleanup_vchan(struct dma_device *dmadev)
1210 {
1211         struct fsl_qdma_chan *chan, *_chan;
1212
1213         list_for_each_entry_safe(chan, _chan,
1214                                  &dmadev->channels, vchan.chan.device_node) {
1215                 list_del(&chan->vchan.chan.device_node);
1216                 tasklet_kill(&chan->vchan.task);
1217         }
1218 }
1219
1220 static int fsl_qdma_remove(struct platform_device *pdev)
1221 {
1222         int i;
1223         struct fsl_qdma_queue *status;
1224         struct device_node *np = pdev->dev.of_node;
1225         struct fsl_qdma_engine *fsl_qdma = platform_get_drvdata(pdev);
1226
1227         fsl_qdma_irq_exit(pdev, fsl_qdma);
1228         fsl_qdma_cleanup_vchan(&fsl_qdma->dma_dev);
1229         of_dma_controller_free(np);
1230         dma_async_device_unregister(&fsl_qdma->dma_dev);
1231
1232         for (i = 0; i < fsl_qdma->block_number; i++) {
1233                 status = fsl_qdma->status[i];
1234                 dma_free_coherent(&pdev->dev, sizeof(struct fsl_qdma_format) *
1235                                 status->n_cq, status->cq, status->bus_addr);
1236         }
1237         return 0;
1238 }
1239
1240 static const struct of_device_id fsl_qdma_dt_ids[] = {
1241         { .compatible = "fsl,ls1021a-qdma", },
1242         { /* sentinel */ }
1243 };
1244 MODULE_DEVICE_TABLE(of, fsl_qdma_dt_ids);
1245
1246 static struct platform_driver fsl_qdma_driver = {
1247         .driver         = {
1248                 .name   = "fsl-qdma",
1249                 .of_match_table = fsl_qdma_dt_ids,
1250         },
1251         .probe          = fsl_qdma_probe,
1252         .remove         = fsl_qdma_remove,
1253 };
1254
1255 module_platform_driver(fsl_qdma_driver);
1256
1257 MODULE_ALIAS("platform:fsl-qdma");
1258 MODULE_LICENSE("GPL v2");
1259 MODULE_DESCRIPTION("NXP Layerscape qDMA engine driver");