drivers/spi/spi-orion.c

   1 /*
   2  * Marvell Orion SPI controller driver
   3  *
   4  * Author: Shadi Ammouri <shadi@marvell.com>
   5  * Copyright (C) 2007-2008 Marvell Ltd.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/interrupt.h>
  13 #include <linux/delay.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/err.h>
  16 #include <linux/io.h>
  17 #include <linux/spi/spi.h>
  18 #include <linux/module.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/of.h>
  21 #include <linux/of_device.h>
  22 #include <linux/clk.h>
  23 #include <linux/sizes.h>
  24 #include <asm/unaligned.h>
  25
  26 #define DRIVER_NAME                     "orion_spi"
  27
  28 /* Runtime PM autosuspend timeout: PM is fairly light on this driver */
  29 #define SPI_AUTOSUSPEND_TIMEOUT         200
  30
  31 /* Some SoCs using this driver support up to 8 chip selects.
  32  * It is up to the implementer to only use the chip selects
  33  * that are available.
  34  */
  35 #define ORION_NUM_CHIPSELECTS           8
  36
  37 #define ORION_SPI_WAIT_RDY_MAX_LOOP     2000 /* in usec */
  38
  39 #define ORION_SPI_IF_CTRL_REG           0x00
  40 #define ORION_SPI_IF_CONFIG_REG         0x04
  41 #define ORION_SPI_DATA_OUT_REG          0x08
  42 #define ORION_SPI_DATA_IN_REG           0x0c
  43 #define ORION_SPI_INT_CAUSE_REG         0x10
  44 #define ORION_SPI_TIMING_PARAMS_REG     0x18
  45
  46 #define ORION_SPI_TMISO_SAMPLE_MASK     (0x3 << 6)
  47 #define ORION_SPI_TMISO_SAMPLE_1        (1 << 6)
  48 #define ORION_SPI_TMISO_SAMPLE_2        (2 << 6)
  49
  50 #define ORION_SPI_MODE_CPOL             (1 << 11)
  51 #define ORION_SPI_MODE_CPHA             (1 << 12)
  52 #define ORION_SPI_IF_8_16_BIT_MODE      (1 << 5)
  53 #define ORION_SPI_CLK_PRESCALE_MASK     0x1F
  54 #define ARMADA_SPI_CLK_PRESCALE_MASK    0xDF
  55 #define ORION_SPI_MODE_MASK             (ORION_SPI_MODE_CPOL | \
  56                                          ORION_SPI_MODE_CPHA)
  57 #define ORION_SPI_CS_MASK       0x1C
  58 #define ORION_SPI_CS_SHIFT      2
  59 #define ORION_SPI_CS(cs)        ((cs << ORION_SPI_CS_SHIFT) & \
  60                                         ORION_SPI_CS_MASK)
  61
  62 enum orion_spi_type {
  63         ORION_SPI,
  64         ARMADA_SPI,
  65 };
  66
  67 struct orion_spi_dev {
  68         enum orion_spi_type     typ;
  69         /*
  70          * min_divisor and max_hz should be exclusive, the only we can
  71          * have both is for managing the armada-370-spi case with old
  72          * device tree
  73          */
  74         unsigned long           max_hz;
  75         unsigned int            min_divisor;
  76         unsigned int            max_divisor;
  77         u32                     prescale_mask;
  78         bool                    is_errata_50mhz_ac;
  79 };
  80
  81 struct orion_spi {
  82         struct spi_master       *master;
  83         void __iomem            *base;
  84         struct clk              *clk;
  85         const struct orion_spi_dev *devdata;
  86 };
  87
  88 static inline void __iomem *spi_reg(struct orion_spi *orion_spi, u32 reg)
  89 {
  90         return orion_spi->base + reg;
  91 }
  92
  93 static inline void
  94 orion_spi_setbits(struct orion_spi *orion_spi, u32 reg, u32 mask)
  95 {
  96         void __iomem *reg_addr = spi_reg(orion_spi, reg);
  97         u32 val;
  98
  99         val = readl(reg_addr);
 100         val |= mask;
 101         writel(val, reg_addr);
 102 }
 103
 104 static inline void
 105 orion_spi_clrbits(struct orion_spi *orion_spi, u32 reg, u32 mask)
 106 {
 107         void __iomem *reg_addr = spi_reg(orion_spi, reg);
 108         u32 val;
 109
 110         val = readl(reg_addr);
 111         val &= ~mask;
 112         writel(val, reg_addr);
 113 }
 114
 115 static int orion_spi_baudrate_set(struct spi_device *spi, unsigned int speed)
 116 {
 117         u32 tclk_hz;
 118         u32 rate;
 119         u32 prescale;
 120         u32 reg;
 121         struct orion_spi *orion_spi;
 122         const struct orion_spi_dev *devdata;
 123
 124         orion_spi = spi_master_get_devdata(spi->master);
 125         devdata = orion_spi->devdata;
 126
 127         tclk_hz = clk_get_rate(orion_spi->clk);
 128
 129         if (devdata->typ == ARMADA_SPI) {
 130                 unsigned int clk, spr, sppr, sppr2, err;
 131                 unsigned int best_spr, best_sppr, best_err;
 132
 133                 best_err = speed;
 134                 best_spr = 0;
 135                 best_sppr = 0;
 136
 137                 /* Iterate over the valid range looking for best fit */
 138                 for (sppr = 0; sppr < 8; sppr++) {
 139                         sppr2 = 0x1 << sppr;
 140
 141                         spr = tclk_hz / sppr2;
 142                         spr = DIV_ROUND_UP(spr, speed);
 143                         if ((spr == 0) || (spr > 15))
 144                                 continue;
 145
 146                         clk = tclk_hz / (spr * sppr2);
 147                         err = speed - clk;
 148
 149                         if (err < best_err) {
 150                                 best_spr = spr;
 151                                 best_sppr = sppr;
 152                                 best_err = err;
 153                         }
 154                 }
 155
 156                 if ((best_sppr == 0) && (best_spr == 0))
 157                         return -EINVAL;
 158
 159                 prescale = ((best_sppr & 0x6) << 5) |
 160                         ((best_sppr & 0x1) << 4) | best_spr;
 161         } else {
 162                 /*
 163                  * the supported rates are: 4,6,8...30
 164                  * round up as we look for equal or less speed
 165                  */
 166                 rate = DIV_ROUND_UP(tclk_hz, speed);
 167                 rate = roundup(rate, 2);
 168
 169                 /* check if requested speed is too small */
 170                 if (rate > 30)
 171                         return -EINVAL;
 172
 173                 if (rate < 4)
 174                         rate = 4;
 175
 176                 /* Convert the rate to SPI clock divisor value. */
 177                 prescale = 0x10 + rate/2;
 178         }
 179
 180         reg = readl(spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
 181         reg = ((reg & ~devdata->prescale_mask) | prescale);
 182         writel(reg, spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
 183
 184         return 0;
 185 }
 186
 187 static void
 188 orion_spi_mode_set(struct spi_device *spi)
 189 {
 190         u32 reg;
 191         struct orion_spi *orion_spi;
 192
 193         orion_spi = spi_master_get_devdata(spi->master);
 194
 195         reg = readl(spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
 196         reg &= ~ORION_SPI_MODE_MASK;
 197         if (spi->mode & SPI_CPOL)
 198                 reg |= ORION_SPI_MODE_CPOL;
 199         if (spi->mode & SPI_CPHA)
 200                 reg |= ORION_SPI_MODE_CPHA;
 201         writel(reg, spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
 202 }
 203
 204 static void
 205 orion_spi_50mhz_ac_timing_erratum(struct spi_device *spi, unsigned int speed)
 206 {
 207         u32 reg;
 208         struct orion_spi *orion_spi;
 209
 210         orion_spi = spi_master_get_devdata(spi->master);
 211
 212         /*
 213          * Erratum description: (Erratum NO. FE-9144572) The device
 214          * SPI interface supports frequencies of up to 50 MHz.
 215          * However, due to this erratum, when the device core clock is
 216          * 250 MHz and the SPI interfaces is configured for 50MHz SPI
 217          * clock and CPOL=CPHA=1 there might occur data corruption on
 218          * reads from the SPI device.
 219          * Erratum Workaround:
 220          * Work in one of the following configurations:
 221          * 1. Set CPOL=CPHA=0 in "SPI Interface Configuration
 222          * Register".
 223          * 2. Set TMISO_SAMPLE value to 0x2 in "SPI Timing Parameters 1
 224          * Register" before setting the interface.
 225          */
 226         reg = readl(spi_reg(orion_spi, ORION_SPI_TIMING_PARAMS_REG));
 227         reg &= ~ORION_SPI_TMISO_SAMPLE_MASK;
 228
 229         if (clk_get_rate(orion_spi->clk) == 250000000 &&
 230                         speed == 50000000 && spi->mode & SPI_CPOL &&
 231                         spi->mode & SPI_CPHA)
 232                 reg |= ORION_SPI_TMISO_SAMPLE_2;
 233         else
 234                 reg |= ORION_SPI_TMISO_SAMPLE_1; /* This is the default value */
 235
 236         writel(reg, spi_reg(orion_spi, ORION_SPI_TIMING_PARAMS_REG));
 237 }
 238
 239 /*
 240  * called only when no transfer is active on the bus
 241  */
 242 static int
 243 orion_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
 244 {
 245         struct orion_spi *orion_spi;
 246         unsigned int speed = spi->max_speed_hz;
 247         unsigned int bits_per_word = spi->bits_per_word;
 248         int     rc;
 249
 250         orion_spi = spi_master_get_devdata(spi->master);
 251
 252         if ((t != NULL) && t->speed_hz)
 253                 speed = t->speed_hz;
 254
 255         if ((t != NULL) && t->bits_per_word)
 256                 bits_per_word = t->bits_per_word;
 257
 258         orion_spi_mode_set(spi);
 259
 260         if (orion_spi->devdata->is_errata_50mhz_ac)
 261                 orion_spi_50mhz_ac_timing_erratum(spi, speed);
 262
 263         rc = orion_spi_baudrate_set(spi, speed);
 264         if (rc)
 265                 return rc;
 266
 267         if (bits_per_word == 16)
 268                 orion_spi_setbits(orion_spi, ORION_SPI_IF_CONFIG_REG,
 269                                   ORION_SPI_IF_8_16_BIT_MODE);
 270         else
 271                 orion_spi_clrbits(orion_spi, ORION_SPI_IF_CONFIG_REG,
 272                                   ORION_SPI_IF_8_16_BIT_MODE);
 273
 274         return 0;
 275 }
 276
 277 static void orion_spi_set_cs(struct spi_device *spi, bool enable)
 278 {
 279         struct orion_spi *orion_spi;
 280
 281         orion_spi = spi_master_get_devdata(spi->master);
 282
 283         orion_spi_clrbits(orion_spi, ORION_SPI_IF_CTRL_REG, ORION_SPI_CS_MASK);
 284         orion_spi_setbits(orion_spi, ORION_SPI_IF_CTRL_REG,
 285                                 ORION_SPI_CS(spi->chip_select));
 286
 287         /* Chip select logic is inverted from spi_set_cs */
 288         if (!enable)
 289                 orion_spi_setbits(orion_spi, ORION_SPI_IF_CTRL_REG, 0x1);
 290         else
 291                 orion_spi_clrbits(orion_spi, ORION_SPI_IF_CTRL_REG, 0x1);
 292 }
 293
 294 static inline int orion_spi_wait_till_ready(struct orion_spi *orion_spi)
 295 {
 296         int i;
 297
 298         for (i = 0; i < ORION_SPI_WAIT_RDY_MAX_LOOP; i++) {
 299                 if (readl(spi_reg(orion_spi, ORION_SPI_INT_CAUSE_REG)))
 300                         return 1;
 301
 302                 udelay(1);
 303         }
 304
 305         return -1;
 306 }
 307
 308 static inline int
 309 orion_spi_write_read_8bit(struct spi_device *spi,
 310                           const u8 **tx_buf, u8 **rx_buf)
 311 {
 312         void __iomem *tx_reg, *rx_reg, *int_reg;
 313         struct orion_spi *orion_spi;
 314
 315         orion_spi = spi_master_get_devdata(spi->master);
 316         tx_reg = spi_reg(orion_spi, ORION_SPI_DATA_OUT_REG);
 317         rx_reg = spi_reg(orion_spi, ORION_SPI_DATA_IN_REG);
 318         int_reg = spi_reg(orion_spi, ORION_SPI_INT_CAUSE_REG);
 319
 320         /* clear the interrupt cause register */
 321         writel(0x0, int_reg);
 322
 323         if (tx_buf && *tx_buf)
 324                 writel(*(*tx_buf)++, tx_reg);
 325         else
 326                 writel(0, tx_reg);
 327
 328         if (orion_spi_wait_till_ready(orion_spi) < 0) {
 329                 dev_err(&spi->dev, "TXS timed out\n");
 330                 return -1;
 331         }
 332
 333         if (rx_buf && *rx_buf)
 334                 *(*rx_buf)++ = readl(rx_reg);
 335
 336         return 1;
 337 }
 338
 339 static inline int
 340 orion_spi_write_read_16bit(struct spi_device *spi,
 341                            const u16 **tx_buf, u16 **rx_buf)
 342 {
 343         void __iomem *tx_reg, *rx_reg, *int_reg;
 344         struct orion_spi *orion_spi;
 345
 346         orion_spi = spi_master_get_devdata(spi->master);
 347         tx_reg = spi_reg(orion_spi, ORION_SPI_DATA_OUT_REG);
 348         rx_reg = spi_reg(orion_spi, ORION_SPI_DATA_IN_REG);
 349         int_reg = spi_reg(orion_spi, ORION_SPI_INT_CAUSE_REG);
 350
 351         /* clear the interrupt cause register */
 352         writel(0x0, int_reg);
 353
 354         if (tx_buf && *tx_buf)
 355                 writel(__cpu_to_le16(get_unaligned((*tx_buf)++)), tx_reg);
 356         else
 357                 writel(0, tx_reg);
 358
 359         if (orion_spi_wait_till_ready(orion_spi) < 0) {
 360                 dev_err(&spi->dev, "TXS timed out\n");
 361                 return -1;
 362         }
 363
 364         if (rx_buf && *rx_buf)
 365                 put_unaligned(__le16_to_cpu(readl(rx_reg)), (*rx_buf)++);
 366
 367         return 1;
 368 }
 369
 370 static unsigned int
 371 orion_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer)
 372 {
 373         unsigned int count;
 374         int word_len;
 375
 376         word_len = spi->bits_per_word;
 377         count = xfer->len;
 378
 379         if (word_len == 8) {
 380                 const u8 *tx = xfer->tx_buf;
 381                 u8 *rx = xfer->rx_buf;
 382
 383                 do {
 384                         if (orion_spi_write_read_8bit(spi, &tx, &rx) < 0)
 385                                 goto out;
 386                         count--;
 387                 } while (count);
 388         } else if (word_len == 16) {
 389                 const u16 *tx = xfer->tx_buf;
 390                 u16 *rx = xfer->rx_buf;
 391
 392                 do {
 393                         if (orion_spi_write_read_16bit(spi, &tx, &rx) < 0)
 394                                 goto out;
 395                         count -= 2;
 396                 } while (count);
 397         }
 398
 399 out:
 400         return xfer->len - count;
 401 }
 402
 403 static int orion_spi_transfer_one(struct spi_master *master,
 404                                         struct spi_device *spi,
 405                                         struct spi_transfer *t)
 406 {
 407         int status = 0;
 408
 409         status = orion_spi_setup_transfer(spi, t);
 410         if (status < 0)
 411                 return status;
 412
 413         if (t->len)
 414                 orion_spi_write_read(spi, t);
 415
 416         return status;
 417 }
 418
 419 static int orion_spi_setup(struct spi_device *spi)
 420 {
 421         return orion_spi_setup_transfer(spi, NULL);
 422 }
 423
 424 static int orion_spi_reset(struct orion_spi *orion_spi)
 425 {
 426         /* Verify that the CS is deasserted */
 427         orion_spi_clrbits(orion_spi, ORION_SPI_IF_CTRL_REG, 0x1);
 428         return 0;
 429 }
 430
 431 static const struct orion_spi_dev orion_spi_dev_data = {
 432         .typ = ORION_SPI,
 433         .min_divisor = 4,
 434         .max_divisor = 30,
 435         .prescale_mask = ORION_SPI_CLK_PRESCALE_MASK,
 436 };
 437
 438 static const struct orion_spi_dev armada_370_spi_dev_data = {
 439         .typ = ARMADA_SPI,
 440         .min_divisor = 4,
 441         .max_divisor = 1920,
 442         .max_hz = 50000000,
 443         .prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK,
 444 };
 445
 446 static const struct orion_spi_dev armada_xp_spi_dev_data = {
 447         .typ = ARMADA_SPI,
 448         .max_hz = 50000000,
 449         .max_divisor = 1920,
 450         .prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK,
 451 };
 452
 453 static const struct orion_spi_dev armada_375_spi_dev_data = {
 454         .typ = ARMADA_SPI,
 455         .min_divisor = 15,
 456         .max_divisor = 1920,
 457         .prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK,
 458 };
 459
 460 static const struct orion_spi_dev armada_380_spi_dev_data = {
 461         .typ = ARMADA_SPI,
 462         .max_hz = 50000000,
 463         .max_divisor = 1920,
 464         .prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK,
 465         .is_errata_50mhz_ac = true,
 466 };
 467
 468 static const struct of_device_id orion_spi_of_match_table[] = {
 469         {
 470                 .compatible = "marvell,orion-spi",
 471                 .data = &orion_spi_dev_data,
 472         },
 473         {
 474                 .compatible = "marvell,armada-370-spi",
 475                 .data = &armada_370_spi_dev_data,
 476         },
 477         {
 478                 .compatible = "marvell,armada-375-spi",
 479                 .data = &armada_375_spi_dev_data,
 480         },
 481         {
 482                 .compatible = "marvell,armada-380-spi",
 483                 .data = &armada_380_spi_dev_data,
 484         },
 485         {
 486                 .compatible = "marvell,armada-390-spi",
 487                 .data = &armada_xp_spi_dev_data,
 488         },
 489         {
 490                 .compatible = "marvell,armada-xp-spi",
 491                 .data = &armada_xp_spi_dev_data,
 492         },
 493
 494         {}
 495 };
 496 MODULE_DEVICE_TABLE(of, orion_spi_of_match_table);
 497
 498 static int orion_spi_probe(struct platform_device *pdev)
 499 {
 500         const struct of_device_id *of_id;
 501         const struct orion_spi_dev *devdata;
 502         struct spi_master *master;
 503         struct orion_spi *spi;
 504         struct resource *r;
 505         unsigned long tclk_hz;
 506         int status = 0;
 507
 508         master = spi_alloc_master(&pdev->dev, sizeof(*spi));
 509         if (master == NULL) {
 510                 dev_dbg(&pdev->dev, "master allocation failed\n");
 511                 return -ENOMEM;
 512         }
 513
 514         if (pdev->id != -1)
 515                 master->bus_num = pdev->id;
 516         if (pdev->dev.of_node) {
 517                 u32 cell_index;
 518
 519                 if (!of_property_read_u32(pdev->dev.of_node, "cell-index",
 520                                           &cell_index))
 521                         master->bus_num = cell_index;
 522         }
 523
 524         /* we support only mode 0, and no options */
 525         master->mode_bits = SPI_CPHA | SPI_CPOL;
 526         master->set_cs = orion_spi_set_cs;
 527         master->transfer_one = orion_spi_transfer_one;
 528         master->num_chipselect = ORION_NUM_CHIPSELECTS;
 529         master->setup = orion_spi_setup;
 530         master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
 531         master->auto_runtime_pm = true;
 532
 533         platform_set_drvdata(pdev, master);
 534
 535         spi = spi_master_get_devdata(master);
 536         spi->master = master;
 537
 538         of_id = of_match_device(orion_spi_of_match_table, &pdev->dev);
 539         devdata = (of_id) ? of_id->data : &orion_spi_dev_data;
 540         spi->devdata = devdata;
 541
 542         spi->clk = devm_clk_get(&pdev->dev, NULL);
 543         if (IS_ERR(spi->clk)) {
 544                 status = PTR_ERR(spi->clk);
 545                 goto out;
 546         }
 547
 548         status = clk_prepare_enable(spi->clk);
 549         if (status)
 550                 goto out;
 551
 552         tclk_hz = clk_get_rate(spi->clk);
 553
 554         /*
 555          * With old device tree, armada-370-spi could be used with
 556          * Armada XP, however for this SoC the maximum frequency is
 557          * 50MHz instead of tclk/4. On Armada 370, tclk cannot be
 558          * higher than 200MHz. So, in order to be able to handle both
 559          * SoCs, we can take the minimum of 50MHz and tclk/4.
 560          */
 561         if (of_device_is_compatible(pdev->dev.of_node,
 562                                         "marvell,armada-370-spi"))
 563                 master->max_speed_hz = min(devdata->max_hz,
 564                                 DIV_ROUND_UP(tclk_hz, devdata->min_divisor));
 565         else if (devdata->min_divisor)
 566                 master->max_speed_hz =
 567                         DIV_ROUND_UP(tclk_hz, devdata->min_divisor);
 568         else
 569                 master->max_speed_hz = devdata->max_hz;
 570         master->min_speed_hz = DIV_ROUND_UP(tclk_hz, devdata->max_divisor);
 571
 572         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 573         spi->base = devm_ioremap_resource(&pdev->dev, r);
 574         if (IS_ERR(spi->base)) {
 575                 status = PTR_ERR(spi->base);
 576                 goto out_rel_clk;
 577         }
 578
 579         pm_runtime_set_active(&pdev->dev);
 580         pm_runtime_use_autosuspend(&pdev->dev);
 581         pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
 582         pm_runtime_enable(&pdev->dev);
 583
 584         status = orion_spi_reset(spi);
 585         if (status < 0)
 586                 goto out_rel_pm;
 587
 588         pm_runtime_mark_last_busy(&pdev->dev);
 589         pm_runtime_put_autosuspend(&pdev->dev);
 590
 591         master->dev.of_node = pdev->dev.of_node;
 592         status = spi_register_master(master);
 593         if (status < 0)
 594                 goto out_rel_pm;
 595
 596         return status;
 597
 598 out_rel_pm:
 599         pm_runtime_disable(&pdev->dev);
 600 out_rel_clk:
 601         clk_disable_unprepare(spi->clk);
 602 out:
 603         spi_master_put(master);
 604         return status;
 605 }
 606
 607
 608 static int orion_spi_remove(struct platform_device *pdev)
 609 {
 610         struct spi_master *master = platform_get_drvdata(pdev);
 611         struct orion_spi *spi = spi_master_get_devdata(master);
 612
 613         pm_runtime_get_sync(&pdev->dev);
 614         clk_disable_unprepare(spi->clk);
 615
 616         spi_unregister_master(master);
 617         pm_runtime_disable(&pdev->dev);
 618
 619         return 0;
 620 }
 621
 622 MODULE_ALIAS("platform:" DRIVER_NAME);
 623
 624 #ifdef CONFIG_PM
 625 static int orion_spi_runtime_suspend(struct device *dev)
 626 {
 627         struct spi_master *master = dev_get_drvdata(dev);
 628         struct orion_spi *spi = spi_master_get_devdata(master);
 629
 630         clk_disable_unprepare(spi->clk);
 631         return 0;
 632 }
 633
 634 static int orion_spi_runtime_resume(struct device *dev)
 635 {
 636         struct spi_master *master = dev_get_drvdata(dev);
 637         struct orion_spi *spi = spi_master_get_devdata(master);
 638
 639         return clk_prepare_enable(spi->clk);
 640 }
 641 #endif
 642
 643 static const struct dev_pm_ops orion_spi_pm_ops = {
 644         SET_RUNTIME_PM_OPS(orion_spi_runtime_suspend,
 645                            orion_spi_runtime_resume,
 646                            NULL)
 647 };
 648
 649 static struct platform_driver orion_spi_driver = {
 650         .driver = {
 651                 .name   = DRIVER_NAME,
 652                 .pm     = &orion_spi_pm_ops,
 653                 .of_match_table = of_match_ptr(orion_spi_of_match_table),
 654         },
 655         .probe          = orion_spi_probe,
 656         .remove         = orion_spi_remove,
 657 };
 658
 659 module_platform_driver(orion_spi_driver);
 660
 661 MODULE_DESCRIPTION("Orion SPI driver");
 662 MODULE_AUTHOR("Shadi Ammouri <shadi@marvell.com>");
 663 MODULE_LICENSE("GPL");