drivers/spi/spi-axi-spi-engine.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * SPI-Engine SPI controller driver
   4  * Copyright 2015 Analog Devices Inc.
   5  *  Author: Lars-Peter Clausen <lars@metafoo.de>
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/io.h>
  11 #include <linux/of.h>
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/spi/spi.h>
  15
  16 #define SPI_ENGINE_VERSION_MAJOR(x)     ((x >> 16) & 0xff)
  17 #define SPI_ENGINE_VERSION_MINOR(x)     ((x >> 8) & 0xff)
  18 #define SPI_ENGINE_VERSION_PATCH(x)     (x & 0xff)
  19
  20 #define SPI_ENGINE_REG_VERSION                  0x00
  21
  22 #define SPI_ENGINE_REG_RESET                    0x40
  23
  24 #define SPI_ENGINE_REG_INT_ENABLE               0x80
  25 #define SPI_ENGINE_REG_INT_PENDING              0x84
  26 #define SPI_ENGINE_REG_INT_SOURCE               0x88
  27
  28 #define SPI_ENGINE_REG_SYNC_ID                  0xc0
  29
  30 #define SPI_ENGINE_REG_CMD_FIFO_ROOM            0xd0
  31 #define SPI_ENGINE_REG_SDO_FIFO_ROOM            0xd4
  32 #define SPI_ENGINE_REG_SDI_FIFO_LEVEL           0xd8
  33
  34 #define SPI_ENGINE_REG_CMD_FIFO                 0xe0
  35 #define SPI_ENGINE_REG_SDO_DATA_FIFO            0xe4
  36 #define SPI_ENGINE_REG_SDI_DATA_FIFO            0xe8
  37 #define SPI_ENGINE_REG_SDI_DATA_FIFO_PEEK       0xec
  38
  39 #define SPI_ENGINE_INT_CMD_ALMOST_EMPTY         BIT(0)
  40 #define SPI_ENGINE_INT_SDO_ALMOST_EMPTY         BIT(1)
  41 #define SPI_ENGINE_INT_SDI_ALMOST_FULL          BIT(2)
  42 #define SPI_ENGINE_INT_SYNC                     BIT(3)
  43
  44 #define SPI_ENGINE_CONFIG_CPHA                  BIT(0)
  45 #define SPI_ENGINE_CONFIG_CPOL                  BIT(1)
  46 #define SPI_ENGINE_CONFIG_3WIRE                 BIT(2)
  47
  48 #define SPI_ENGINE_INST_TRANSFER                0x0
  49 #define SPI_ENGINE_INST_ASSERT                  0x1
  50 #define SPI_ENGINE_INST_WRITE                   0x2
  51 #define SPI_ENGINE_INST_MISC                    0x3
  52
  53 #define SPI_ENGINE_CMD_REG_CLK_DIV              0x0
  54 #define SPI_ENGINE_CMD_REG_CONFIG               0x1
  55
  56 #define SPI_ENGINE_MISC_SYNC                    0x0
  57 #define SPI_ENGINE_MISC_SLEEP                   0x1
  58
  59 #define SPI_ENGINE_TRANSFER_WRITE               0x1
  60 #define SPI_ENGINE_TRANSFER_READ                0x2
  61
  62 #define SPI_ENGINE_CMD(inst, arg1, arg2) \
  63         (((inst) << 12) | ((arg1) << 8) | (arg2))
  64
  65 #define SPI_ENGINE_CMD_TRANSFER(flags, n) \
  66         SPI_ENGINE_CMD(SPI_ENGINE_INST_TRANSFER, (flags), (n))
  67 #define SPI_ENGINE_CMD_ASSERT(delay, cs) \
  68         SPI_ENGINE_CMD(SPI_ENGINE_INST_ASSERT, (delay), (cs))
  69 #define SPI_ENGINE_CMD_WRITE(reg, val) \
  70         SPI_ENGINE_CMD(SPI_ENGINE_INST_WRITE, (reg), (val))
  71 #define SPI_ENGINE_CMD_SLEEP(delay) \
  72         SPI_ENGINE_CMD(SPI_ENGINE_INST_MISC, SPI_ENGINE_MISC_SLEEP, (delay))
  73 #define SPI_ENGINE_CMD_SYNC(id) \
  74         SPI_ENGINE_CMD(SPI_ENGINE_INST_MISC, SPI_ENGINE_MISC_SYNC, (id))
  75
  76 struct spi_engine_program {
  77         unsigned int length;
  78         uint16_t instructions[];
  79 };
  80
  81 struct spi_engine {
  82         struct clk *clk;
  83         struct clk *ref_clk;
  84
  85         spinlock_t lock;
  86
  87         void __iomem *base;
  88
  89         struct spi_message *msg;
  90         struct spi_engine_program *p;
  91         unsigned cmd_length;
  92         const uint16_t *cmd_buf;
  93
  94         struct spi_transfer *tx_xfer;
  95         unsigned int tx_length;
  96         const uint8_t *tx_buf;
  97
  98         struct spi_transfer *rx_xfer;
  99         unsigned int rx_length;
 100         uint8_t *rx_buf;
 101
 102         unsigned int sync_id;
 103         unsigned int completed_id;
 104
 105         unsigned int int_enable;
 106 };
 107
 108 static void spi_engine_program_add_cmd(struct spi_engine_program *p,
 109         bool dry, uint16_t cmd)
 110 {
 111         if (!dry)
 112                 p->instructions[p->length] = cmd;
 113         p->length++;
 114 }
 115
 116 static unsigned int spi_engine_get_config(struct spi_device *spi)
 117 {
 118         unsigned int config = 0;
 119
 120         if (spi->mode & SPI_CPOL)
 121                 config |= SPI_ENGINE_CONFIG_CPOL;
 122         if (spi->mode & SPI_CPHA)
 123                 config |= SPI_ENGINE_CONFIG_CPHA;
 124         if (spi->mode & SPI_3WIRE)
 125                 config |= SPI_ENGINE_CONFIG_3WIRE;
 126
 127         return config;
 128 }
 129
 130 static unsigned int spi_engine_get_clk_div(struct spi_engine *spi_engine,
 131         struct spi_device *spi, struct spi_transfer *xfer)
 132 {
 133         unsigned int clk_div;
 134
 135         clk_div = DIV_ROUND_UP(clk_get_rate(spi_engine->ref_clk),
 136                 xfer->speed_hz * 2);
 137         if (clk_div > 255)
 138                 clk_div = 255;
 139         else if (clk_div > 0)
 140                 clk_div -= 1;
 141
 142         return clk_div;
 143 }
 144
 145 static void spi_engine_gen_xfer(struct spi_engine_program *p, bool dry,
 146         struct spi_transfer *xfer)
 147 {
 148         unsigned int len = xfer->len;
 149
 150         while (len) {
 151                 unsigned int n = min(len, 256U);
 152                 unsigned int flags = 0;
 153
 154                 if (xfer->tx_buf)
 155                         flags |= SPI_ENGINE_TRANSFER_WRITE;
 156                 if (xfer->rx_buf)
 157                         flags |= SPI_ENGINE_TRANSFER_READ;
 158
 159                 spi_engine_program_add_cmd(p, dry,
 160                         SPI_ENGINE_CMD_TRANSFER(flags, n - 1));
 161                 len -= n;
 162         }
 163 }
 164
 165 static void spi_engine_gen_sleep(struct spi_engine_program *p, bool dry,
 166         struct spi_engine *spi_engine, unsigned int clk_div,
 167         struct spi_transfer *xfer)
 168 {
 169         unsigned int spi_clk = clk_get_rate(spi_engine->ref_clk);
 170         unsigned int t;
 171         int delay;
 172
 173         if (xfer->delay_usecs) {
 174                 delay = xfer->delay_usecs;
 175         } else {
 176                 delay = spi_delay_to_ns(&xfer->delay, xfer);
 177                 if (delay < 0)
 178                         return;
 179                 delay /= 1000;
 180         }
 181
 182         if (delay == 0)
 183                 return;
 184
 185         t = DIV_ROUND_UP(delay * spi_clk, (clk_div + 1) * 2);
 186         while (t) {
 187                 unsigned int n = min(t, 256U);
 188
 189                 spi_engine_program_add_cmd(p, dry, SPI_ENGINE_CMD_SLEEP(n - 1));
 190                 t -= n;
 191         }
 192 }
 193
 194 static void spi_engine_gen_cs(struct spi_engine_program *p, bool dry,
 195                 struct spi_device *spi, bool assert)
 196 {
 197         unsigned int mask = 0xff;
 198
 199         if (assert)
 200                 mask ^= BIT(spi->chip_select);
 201
 202         spi_engine_program_add_cmd(p, dry, SPI_ENGINE_CMD_ASSERT(1, mask));
 203 }
 204
 205 static int spi_engine_compile_message(struct spi_engine *spi_engine,
 206         struct spi_message *msg, bool dry, struct spi_engine_program *p)
 207 {
 208         struct spi_device *spi = msg->spi;
 209         struct spi_transfer *xfer;
 210         int clk_div, new_clk_div;
 211         bool cs_change = true;
 212
 213         clk_div = -1;
 214
 215         spi_engine_program_add_cmd(p, dry,
 216                 SPI_ENGINE_CMD_WRITE(SPI_ENGINE_CMD_REG_CONFIG,
 217                         spi_engine_get_config(spi)));
 218
 219         list_for_each_entry(xfer, &msg->transfers, transfer_list) {
 220                 new_clk_div = spi_engine_get_clk_div(spi_engine, spi, xfer);
 221                 if (new_clk_div != clk_div) {
 222                         clk_div = new_clk_div;
 223                         spi_engine_program_add_cmd(p, dry,
 224                                 SPI_ENGINE_CMD_WRITE(SPI_ENGINE_CMD_REG_CLK_DIV,
 225                                         clk_div));
 226                 }
 227
 228                 if (cs_change)
 229                         spi_engine_gen_cs(p, dry, spi, true);
 230
 231                 spi_engine_gen_xfer(p, dry, xfer);
 232                 spi_engine_gen_sleep(p, dry, spi_engine, clk_div, xfer);
 233
 234                 cs_change = xfer->cs_change;
 235                 if (list_is_last(&xfer->transfer_list, &msg->transfers))
 236                         cs_change = !cs_change;
 237
 238                 if (cs_change)
 239                         spi_engine_gen_cs(p, dry, spi, false);
 240         }
 241
 242         return 0;
 243 }
 244
 245 static void spi_engine_xfer_next(struct spi_engine *spi_engine,
 246         struct spi_transfer **_xfer)
 247 {
 248         struct spi_message *msg = spi_engine->msg;
 249         struct spi_transfer *xfer = *_xfer;
 250
 251         if (!xfer) {
 252                 xfer = list_first_entry(&msg->transfers,
 253                         struct spi_transfer, transfer_list);
 254         } else if (list_is_last(&xfer->transfer_list, &msg->transfers)) {
 255                 xfer = NULL;
 256         } else {
 257                 xfer = list_next_entry(xfer, transfer_list);
 258         }
 259
 260         *_xfer = xfer;
 261 }
 262
 263 static void spi_engine_tx_next(struct spi_engine *spi_engine)
 264 {
 265         struct spi_transfer *xfer = spi_engine->tx_xfer;
 266
 267         do {
 268                 spi_engine_xfer_next(spi_engine, &xfer);
 269         } while (xfer && !xfer->tx_buf);
 270
 271         spi_engine->tx_xfer = xfer;
 272         if (xfer) {
 273                 spi_engine->tx_length = xfer->len;
 274                 spi_engine->tx_buf = xfer->tx_buf;
 275         } else {
 276                 spi_engine->tx_buf = NULL;
 277         }
 278 }
 279
 280 static void spi_engine_rx_next(struct spi_engine *spi_engine)
 281 {
 282         struct spi_transfer *xfer = spi_engine->rx_xfer;
 283
 284         do {
 285                 spi_engine_xfer_next(spi_engine, &xfer);
 286         } while (xfer && !xfer->rx_buf);
 287
 288         spi_engine->rx_xfer = xfer;
 289         if (xfer) {
 290                 spi_engine->rx_length = xfer->len;
 291                 spi_engine->rx_buf = xfer->rx_buf;
 292         } else {
 293                 spi_engine->rx_buf = NULL;
 294         }
 295 }
 296
 297 static bool spi_engine_write_cmd_fifo(struct spi_engine *spi_engine)
 298 {
 299         void __iomem *addr = spi_engine->base + SPI_ENGINE_REG_CMD_FIFO;
 300         unsigned int n, m, i;
 301         const uint16_t *buf;
 302
 303         n = readl_relaxed(spi_engine->base + SPI_ENGINE_REG_CMD_FIFO_ROOM);
 304         while (n && spi_engine->cmd_length) {
 305                 m = min(n, spi_engine->cmd_length);
 306                 buf = spi_engine->cmd_buf;
 307                 for (i = 0; i < m; i++)
 308                         writel_relaxed(buf[i], addr);
 309                 spi_engine->cmd_buf += m;
 310                 spi_engine->cmd_length -= m;
 311                 n -= m;
 312         }
 313
 314         return spi_engine->cmd_length != 0;
 315 }
 316
 317 static bool spi_engine_write_tx_fifo(struct spi_engine *spi_engine)
 318 {
 319         void __iomem *addr = spi_engine->base + SPI_ENGINE_REG_SDO_DATA_FIFO;
 320         unsigned int n, m, i;
 321         const uint8_t *buf;
 322
 323         n = readl_relaxed(spi_engine->base + SPI_ENGINE_REG_SDO_FIFO_ROOM);
 324         while (n && spi_engine->tx_length) {
 325                 m = min(n, spi_engine->tx_length);
 326                 buf = spi_engine->tx_buf;
 327                 for (i = 0; i < m; i++)
 328                         writel_relaxed(buf[i], addr);
 329                 spi_engine->tx_buf += m;
 330                 spi_engine->tx_length -= m;
 331                 n -= m;
 332                 if (spi_engine->tx_length == 0)
 333                         spi_engine_tx_next(spi_engine);
 334         }
 335
 336         return spi_engine->tx_length != 0;
 337 }
 338
 339 static bool spi_engine_read_rx_fifo(struct spi_engine *spi_engine)
 340 {
 341         void __iomem *addr = spi_engine->base + SPI_ENGINE_REG_SDI_DATA_FIFO;
 342         unsigned int n, m, i;
 343         uint8_t *buf;
 344
 345         n = readl_relaxed(spi_engine->base + SPI_ENGINE_REG_SDI_FIFO_LEVEL);
 346         while (n && spi_engine->rx_length) {
 347                 m = min(n, spi_engine->rx_length);
 348                 buf = spi_engine->rx_buf;
 349                 for (i = 0; i < m; i++)
 350                         buf[i] = readl_relaxed(addr);
 351                 spi_engine->rx_buf += m;
 352                 spi_engine->rx_length -= m;
 353                 n -= m;
 354                 if (spi_engine->rx_length == 0)
 355                         spi_engine_rx_next(spi_engine);
 356         }
 357
 358         return spi_engine->rx_length != 0;
 359 }
 360
 361 static irqreturn_t spi_engine_irq(int irq, void *devid)
 362 {
 363         struct spi_master *master = devid;
 364         struct spi_engine *spi_engine = spi_master_get_devdata(master);
 365         unsigned int disable_int = 0;
 366         unsigned int pending;
 367
 368         pending = readl_relaxed(spi_engine->base + SPI_ENGINE_REG_INT_PENDING);
 369
 370         if (pending & SPI_ENGINE_INT_SYNC) {
 371                 writel_relaxed(SPI_ENGINE_INT_SYNC,
 372                         spi_engine->base + SPI_ENGINE_REG_INT_PENDING);
 373                 spi_engine->completed_id = readl_relaxed(
 374                         spi_engine->base + SPI_ENGINE_REG_SYNC_ID);
 375         }
 376
 377         spin_lock(&spi_engine->lock);
 378
 379         if (pending & SPI_ENGINE_INT_CMD_ALMOST_EMPTY) {
 380                 if (!spi_engine_write_cmd_fifo(spi_engine))
 381                         disable_int |= SPI_ENGINE_INT_CMD_ALMOST_EMPTY;
 382         }
 383
 384         if (pending & SPI_ENGINE_INT_SDO_ALMOST_EMPTY) {
 385                 if (!spi_engine_write_tx_fifo(spi_engine))
 386                         disable_int |= SPI_ENGINE_INT_SDO_ALMOST_EMPTY;
 387         }
 388
 389         if (pending & (SPI_ENGINE_INT_SDI_ALMOST_FULL | SPI_ENGINE_INT_SYNC)) {
 390                 if (!spi_engine_read_rx_fifo(spi_engine))
 391                         disable_int |= SPI_ENGINE_INT_SDI_ALMOST_FULL;
 392         }
 393
 394         if (pending & SPI_ENGINE_INT_SYNC) {
 395                 if (spi_engine->msg &&
 396                     spi_engine->completed_id == spi_engine->sync_id) {
 397                         struct spi_message *msg = spi_engine->msg;
 398
 399                         kfree(spi_engine->p);
 400                         msg->status = 0;
 401                         msg->actual_length = msg->frame_length;
 402                         spi_engine->msg = NULL;
 403                         spi_finalize_current_message(master);
 404                         disable_int |= SPI_ENGINE_INT_SYNC;
 405                 }
 406         }
 407
 408         if (disable_int) {
 409                 spi_engine->int_enable &= ~disable_int;
 410                 writel_relaxed(spi_engine->int_enable,
 411                         spi_engine->base + SPI_ENGINE_REG_INT_ENABLE);
 412         }
 413
 414         spin_unlock(&spi_engine->lock);
 415
 416         return IRQ_HANDLED;
 417 }
 418
 419 static int spi_engine_transfer_one_message(struct spi_master *master,
 420         struct spi_message *msg)
 421 {
 422         struct spi_engine_program p_dry, *p;
 423         struct spi_engine *spi_engine = spi_master_get_devdata(master);
 424         unsigned int int_enable = 0;
 425         unsigned long flags;
 426         size_t size;
 427
 428         p_dry.length = 0;
 429         spi_engine_compile_message(spi_engine, msg, true, &p_dry);
 430
 431         size = sizeof(*p->instructions) * (p_dry.length + 1);
 432         p = kzalloc(sizeof(*p) + size, GFP_KERNEL);
 433         if (!p)
 434                 return -ENOMEM;
 435         spi_engine_compile_message(spi_engine, msg, false, p);
 436
 437         spin_lock_irqsave(&spi_engine->lock, flags);
 438         spi_engine->sync_id = (spi_engine->sync_id + 1) & 0xff;
 439         spi_engine_program_add_cmd(p, false,
 440                 SPI_ENGINE_CMD_SYNC(spi_engine->sync_id));
 441
 442         spi_engine->msg = msg;
 443         spi_engine->p = p;
 444
 445         spi_engine->cmd_buf = p->instructions;
 446         spi_engine->cmd_length = p->length;
 447         if (spi_engine_write_cmd_fifo(spi_engine))
 448                 int_enable |= SPI_ENGINE_INT_CMD_ALMOST_EMPTY;
 449
 450         spi_engine_tx_next(spi_engine);
 451         if (spi_engine_write_tx_fifo(spi_engine))
 452                 int_enable |= SPI_ENGINE_INT_SDO_ALMOST_EMPTY;
 453
 454         spi_engine_rx_next(spi_engine);
 455         if (spi_engine->rx_length != 0)
 456                 int_enable |= SPI_ENGINE_INT_SDI_ALMOST_FULL;
 457
 458         int_enable |= SPI_ENGINE_INT_SYNC;
 459
 460         writel_relaxed(int_enable,
 461                 spi_engine->base + SPI_ENGINE_REG_INT_ENABLE);
 462         spi_engine->int_enable = int_enable;
 463         spin_unlock_irqrestore(&spi_engine->lock, flags);
 464
 465         return 0;
 466 }
 467
 468 static int spi_engine_probe(struct platform_device *pdev)
 469 {
 470         struct spi_engine *spi_engine;
 471         struct spi_master *master;
 472         unsigned int version;
 473         int irq;
 474         int ret;
 475
 476         irq = platform_get_irq(pdev, 0);
 477         if (irq <= 0)
 478                 return -ENXIO;
 479
 480         spi_engine = devm_kzalloc(&pdev->dev, sizeof(*spi_engine), GFP_KERNEL);
 481         if (!spi_engine)
 482                 return -ENOMEM;
 483
 484         master = spi_alloc_master(&pdev->dev, 0);
 485         if (!master)
 486                 return -ENOMEM;
 487
 488         spi_master_set_devdata(master, spi_engine);
 489
 490         spin_lock_init(&spi_engine->lock);
 491
 492         spi_engine->clk = devm_clk_get(&pdev->dev, "s_axi_aclk");
 493         if (IS_ERR(spi_engine->clk)) {
 494                 ret = PTR_ERR(spi_engine->clk);
 495                 goto err_put_master;
 496         }
 497
 498         spi_engine->ref_clk = devm_clk_get(&pdev->dev, "spi_clk");
 499         if (IS_ERR(spi_engine->ref_clk)) {
 500                 ret = PTR_ERR(spi_engine->ref_clk);
 501                 goto err_put_master;
 502         }
 503
 504         ret = clk_prepare_enable(spi_engine->clk);
 505         if (ret)
 506                 goto err_put_master;
 507
 508         ret = clk_prepare_enable(spi_engine->ref_clk);
 509         if (ret)
 510                 goto err_clk_disable;
 511
 512         spi_engine->base = devm_platform_ioremap_resource(pdev, 0);
 513         if (IS_ERR(spi_engine->base)) {
 514                 ret = PTR_ERR(spi_engine->base);
 515                 goto err_ref_clk_disable;
 516         }
 517
 518         version = readl(spi_engine->base + SPI_ENGINE_REG_VERSION);
 519         if (SPI_ENGINE_VERSION_MAJOR(version) != 1) {
 520                 dev_err(&pdev->dev, "Unsupported peripheral version %u.%u.%c\n",
 521                         SPI_ENGINE_VERSION_MAJOR(version),
 522                         SPI_ENGINE_VERSION_MINOR(version),
 523                         SPI_ENGINE_VERSION_PATCH(version));
 524                 ret = -ENODEV;
 525                 goto err_ref_clk_disable;
 526         }
 527
 528         writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_RESET);
 529         writel_relaxed(0xff, spi_engine->base + SPI_ENGINE_REG_INT_PENDING);
 530         writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_INT_ENABLE);
 531
 532         ret = request_irq(irq, spi_engine_irq, 0, pdev->name, master);
 533         if (ret)
 534                 goto err_ref_clk_disable;
 535
 536         master->dev.of_node = pdev->dev.of_node;
 537         master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_3WIRE;
 538         master->bits_per_word_mask = SPI_BPW_MASK(8);
 539         master->max_speed_hz = clk_get_rate(spi_engine->ref_clk) / 2;
 540         master->transfer_one_message = spi_engine_transfer_one_message;
 541         master->num_chipselect = 8;
 542
 543         ret = spi_register_master(master);
 544         if (ret)
 545                 goto err_free_irq;
 546
 547         platform_set_drvdata(pdev, master);
 548
 549         return 0;
 550 err_free_irq:
 551         free_irq(irq, master);
 552 err_ref_clk_disable:
 553         clk_disable_unprepare(spi_engine->ref_clk);
 554 err_clk_disable:
 555         clk_disable_unprepare(spi_engine->clk);
 556 err_put_master:
 557         spi_master_put(master);
 558         return ret;
 559 }
 560
 561 static int spi_engine_remove(struct platform_device *pdev)
 562 {
 563         struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
 564         struct spi_engine *spi_engine = spi_master_get_devdata(master);
 565         int irq = platform_get_irq(pdev, 0);
 566
 567         spi_unregister_master(master);
 568
 569         free_irq(irq, master);
 570
 571         spi_master_put(master);
 572
 573         writel_relaxed(0xff, spi_engine->base + SPI_ENGINE_REG_INT_PENDING);
 574         writel_relaxed(0x00, spi_engine->base + SPI_ENGINE_REG_INT_ENABLE);
 575         writel_relaxed(0x01, spi_engine->base + SPI_ENGINE_REG_RESET);
 576
 577         clk_disable_unprepare(spi_engine->ref_clk);
 578         clk_disable_unprepare(spi_engine->clk);
 579
 580         return 0;
 581 }
 582
 583 static const struct of_device_id spi_engine_match_table[] = {
 584         { .compatible = "adi,axi-spi-engine-1.00.a" },
 585         { },
 586 };
 587 MODULE_DEVICE_TABLE(of, spi_engine_match_table);
 588
 589 static struct platform_driver spi_engine_driver = {
 590         .probe = spi_engine_probe,
 591         .remove = spi_engine_remove,
 592         .driver = {
 593                 .name = "spi-engine",
 594                 .of_match_table = spi_engine_match_table,
 595         },
 596 };
 597 module_platform_driver(spi_engine_driver);
 598
 599 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 600 MODULE_DESCRIPTION("Analog Devices SPI engine peripheral driver");
 601 MODULE_LICENSE("GPL");