drivers/spi/spi-fsl-dspi.c

   1 /*
   2  * drivers/spi/spi-fsl-dspi.c
   3  *
   4  * Copyright 2013 Freescale Semiconductor, Inc.
   5  *
   6  * Freescale DSPI driver
   7  * This file contains a driver for the Freescale DSPI
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  */
  15
  16 #include <linux/clk.h>
  17 #include <linux/delay.h>
  18 #include <linux/err.h>
  19 #include <linux/errno.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/io.h>
  22 #include <linux/kernel.h>
  23 #include <linux/math64.h>
  24 #include <linux/module.h>
  25 #include <linux/of.h>
  26 #include <linux/of_device.h>
  27 #include <linux/pinctrl/consumer.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/pm_runtime.h>
  30 #include <linux/regmap.h>
  31 #include <linux/sched.h>
  32 #include <linux/spi/spi.h>
  33 #include <linux/spi/spi_bitbang.h>
  34 #include <linux/time.h>
  35
  36 #define DRIVER_NAME "fsl-dspi"
  37
  38 #define TRAN_STATE_RX_VOID              0x01
  39 #define TRAN_STATE_TX_VOID              0x02
  40 #define TRAN_STATE_WORD_ODD_NUM 0x04
  41
  42 #define DSPI_FIFO_SIZE                  4
  43
  44 #define SPI_MCR         0x00
  45 #define SPI_MCR_MASTER          (1 << 31)
  46 #define SPI_MCR_PCSIS           (0x3F << 16)
  47 #define SPI_MCR_CLR_TXF (1 << 11)
  48 #define SPI_MCR_CLR_RXF (1 << 10)
  49
  50 #define SPI_TCR                 0x08
  51 #define SPI_TCR_GET_TCNT(x)     (((x) & 0xffff0000) >> 16)
  52
  53 #define SPI_CTAR(x)             (0x0c + (((x) & 0x3) * 4))
  54 #define SPI_CTAR_FMSZ(x)        (((x) & 0x0000000f) << 27)
  55 #define SPI_CTAR_CPOL(x)        ((x) << 26)
  56 #define SPI_CTAR_CPHA(x)        ((x) << 25)
  57 #define SPI_CTAR_LSBFE(x)       ((x) << 24)
  58 #define SPI_CTAR_PCSSCK(x)      (((x) & 0x00000003) << 22)
  59 #define SPI_CTAR_PASC(x)        (((x) & 0x00000003) << 20)
  60 #define SPI_CTAR_PDT(x) (((x) & 0x00000003) << 18)
  61 #define SPI_CTAR_PBR(x) (((x) & 0x00000003) << 16)
  62 #define SPI_CTAR_CSSCK(x)       (((x) & 0x0000000f) << 12)
  63 #define SPI_CTAR_ASC(x) (((x) & 0x0000000f) << 8)
  64 #define SPI_CTAR_DT(x)          (((x) & 0x0000000f) << 4)
  65 #define SPI_CTAR_BR(x)          ((x) & 0x0000000f)
  66 #define SPI_CTAR_SCALE_BITS     0xf
  67
  68 #define SPI_CTAR0_SLAVE 0x0c
  69
  70 #define SPI_SR                  0x2c
  71 #define SPI_SR_EOQF             0x10000000
  72 #define SPI_SR_TCFQF            0x80000000
  73
  74 #define SPI_RSER                0x30
  75 #define SPI_RSER_EOQFE          0x10000000
  76 #define SPI_RSER_TCFQE          0x80000000
  77
  78 #define SPI_PUSHR               0x34
  79 #define SPI_PUSHR_CONT          (1 << 31)
  80 #define SPI_PUSHR_CTAS(x)       (((x) & 0x00000003) << 28)
  81 #define SPI_PUSHR_EOQ           (1 << 27)
  82 #define SPI_PUSHR_CTCNT (1 << 26)
  83 #define SPI_PUSHR_PCS(x)        (((1 << x) & 0x0000003f) << 16)
  84 #define SPI_PUSHR_TXDATA(x)     ((x) & 0x0000ffff)
  85
  86 #define SPI_PUSHR_SLAVE 0x34
  87
  88 #define SPI_POPR                0x38
  89 #define SPI_POPR_RXDATA(x)      ((x) & 0x0000ffff)
  90
  91 #define SPI_TXFR0               0x3c
  92 #define SPI_TXFR1               0x40
  93 #define SPI_TXFR2               0x44
  94 #define SPI_TXFR3               0x48
  95 #define SPI_RXFR0               0x7c
  96 #define SPI_RXFR1               0x80
  97 #define SPI_RXFR2               0x84
  98 #define SPI_RXFR3               0x88
  99
 100 #define SPI_FRAME_BITS(bits)    SPI_CTAR_FMSZ((bits) - 1)
 101 #define SPI_FRAME_BITS_MASK     SPI_CTAR_FMSZ(0xf)
 102 #define SPI_FRAME_BITS_16       SPI_CTAR_FMSZ(0xf)
 103 #define SPI_FRAME_BITS_8        SPI_CTAR_FMSZ(0x7)
 104
 105 #define SPI_CS_INIT             0x01
 106 #define SPI_CS_ASSERT           0x02
 107 #define SPI_CS_DROP             0x04
 108
 109 #define SPI_TCR_TCNT_MAX        0x10000
 110
 111 struct chip_data {
 112         u32 mcr_val;
 113         u32 ctar_val;
 114         u16 void_write_data;
 115 };
 116
 117 enum dspi_trans_mode {
 118         DSPI_EOQ_MODE = 0,
 119         DSPI_TCFQ_MODE,
 120 };
 121
 122 struct fsl_dspi_devtype_data {
 123         enum dspi_trans_mode trans_mode;
 124 };
 125
 126 static const struct fsl_dspi_devtype_data vf610_data = {
 127         .trans_mode = DSPI_EOQ_MODE,
 128 };
 129
 130 static const struct fsl_dspi_devtype_data ls1021a_v1_data = {
 131         .trans_mode = DSPI_TCFQ_MODE,
 132 };
 133
 134 static const struct fsl_dspi_devtype_data ls2085a_data = {
 135         .trans_mode = DSPI_TCFQ_MODE,
 136 };
 137
 138 struct fsl_dspi {
 139         struct spi_master       *master;
 140         struct platform_device  *pdev;
 141
 142         struct regmap           *regmap;
 143         int                     irq;
 144         struct clk              *clk;
 145
 146         struct spi_transfer     *cur_transfer;
 147         struct spi_message      *cur_msg;
 148         struct chip_data        *cur_chip;
 149         size_t                  len;
 150         void                    *tx;
 151         void                    *tx_end;
 152         void                    *rx;
 153         void                    *rx_end;
 154         char                    dataflags;
 155         u8                      cs;
 156         u16                     void_write_data;
 157         u32                     cs_change;
 158         struct fsl_dspi_devtype_data *devtype_data;
 159
 160         wait_queue_head_t       waitq;
 161         u32                     waitflags;
 162
 163         u32                     spi_tcnt;
 164 };
 165
 166 static inline int is_double_byte_mode(struct fsl_dspi *dspi)
 167 {
 168         unsigned int val;
 169
 170         regmap_read(dspi->regmap, SPI_CTAR(0), &val);
 171
 172         return ((val & SPI_FRAME_BITS_MASK) == SPI_FRAME_BITS(8)) ? 0 : 1;
 173 }
 174
 175 static void hz_to_spi_baud(char *pbr, char *br, int speed_hz,
 176                 unsigned long clkrate)
 177 {
 178         /* Valid baud rate pre-scaler values */
 179         int pbr_tbl[4] = {2, 3, 5, 7};
 180         int brs[16] = { 2,      4,      6,      8,
 181                 16,     32,     64,     128,
 182                 256,    512,    1024,   2048,
 183                 4096,   8192,   16384,  32768 };
 184         int scale_needed, scale, minscale = INT_MAX;
 185         int i, j;
 186
 187         scale_needed = clkrate / speed_hz;
 188         if (clkrate % speed_hz)
 189                 scale_needed++;
 190
 191         for (i = 0; i < ARRAY_SIZE(brs); i++)
 192                 for (j = 0; j < ARRAY_SIZE(pbr_tbl); j++) {
 193                         scale = brs[i] * pbr_tbl[j];
 194                         if (scale >= scale_needed) {
 195                                 if (scale < minscale) {
 196                                         minscale = scale;
 197                                         *br = i;
 198                                         *pbr = j;
 199                                 }
 200                                 break;
 201                         }
 202                 }
 203
 204         if (minscale == INT_MAX) {
 205                 pr_warn("Can not find valid baud rate,speed_hz is %d,clkrate is %ld, we use the max prescaler value.\n",
 206                         speed_hz, clkrate);
 207                 *pbr = ARRAY_SIZE(pbr_tbl) - 1;
 208                 *br =  ARRAY_SIZE(brs) - 1;
 209         }
 210 }
 211
 212 static void ns_delay_scale(char *psc, char *sc, int delay_ns,
 213                 unsigned long clkrate)
 214 {
 215         int pscale_tbl[4] = {1, 3, 5, 7};
 216         int scale_needed, scale, minscale = INT_MAX;
 217         int i, j;
 218         u32 remainder;
 219
 220         scale_needed = div_u64_rem((u64)delay_ns * clkrate, NSEC_PER_SEC,
 221                         &remainder);
 222         if (remainder)
 223                 scale_needed++;
 224
 225         for (i = 0; i < ARRAY_SIZE(pscale_tbl); i++)
 226                 for (j = 0; j <= SPI_CTAR_SCALE_BITS; j++) {
 227                         scale = pscale_tbl[i] * (2 << j);
 228                         if (scale >= scale_needed) {
 229                                 if (scale < minscale) {
 230                                         minscale = scale;
 231                                         *psc = i;
 232                                         *sc = j;
 233                                 }
 234                                 break;
 235                         }
 236                 }
 237
 238         if (minscale == INT_MAX) {
 239                 pr_warn("Cannot find correct scale values for %dns delay at clkrate %ld, using max prescaler value",
 240                         delay_ns, clkrate);
 241                 *psc = ARRAY_SIZE(pscale_tbl) - 1;
 242                 *sc = SPI_CTAR_SCALE_BITS;
 243         }
 244 }
 245
 246 static u32 dspi_data_to_pushr(struct fsl_dspi *dspi, int tx_word)
 247 {
 248         u16 d16;
 249
 250         if (!(dspi->dataflags & TRAN_STATE_TX_VOID))
 251                 d16 = tx_word ? *(u16 *)dspi->tx : *(u8 *)dspi->tx;
 252         else
 253                 d16 = dspi->void_write_data;
 254
 255         dspi->tx += tx_word + 1;
 256         dspi->len -= tx_word + 1;
 257
 258         return  SPI_PUSHR_TXDATA(d16) |
 259                 SPI_PUSHR_PCS(dspi->cs) |
 260                 SPI_PUSHR_CTAS(0) |
 261                 SPI_PUSHR_CONT;
 262 }
 263
 264 static void dspi_data_from_popr(struct fsl_dspi *dspi, int rx_word)
 265 {
 266         u16 d;
 267         unsigned int val;
 268
 269         regmap_read(dspi->regmap, SPI_POPR, &val);
 270         d = SPI_POPR_RXDATA(val);
 271
 272         if (!(dspi->dataflags & TRAN_STATE_RX_VOID))
 273                 rx_word ? (*(u16 *)dspi->rx = d) : (*(u8 *)dspi->rx = d);
 274
 275         dspi->rx += rx_word + 1;
 276 }
 277
 278 static int dspi_eoq_write(struct fsl_dspi *dspi)
 279 {
 280         int tx_count = 0;
 281         int tx_word;
 282         u32 dspi_pushr = 0;
 283
 284         tx_word = is_double_byte_mode(dspi);
 285
 286         while (dspi->len && (tx_count < DSPI_FIFO_SIZE)) {
 287                 /* If we are in word mode, only have a single byte to transfer
 288                  * switch to byte mode temporarily.  Will switch back at the
 289                  * end of the transfer.
 290                  */
 291                 if (tx_word && (dspi->len == 1)) {
 292                         dspi->dataflags |= TRAN_STATE_WORD_ODD_NUM;
 293                         regmap_update_bits(dspi->regmap, SPI_CTAR(0),
 294                                         SPI_FRAME_BITS_MASK, SPI_FRAME_BITS(8));
 295                         tx_word = 0;
 296                 }
 297
 298                 dspi_pushr = dspi_data_to_pushr(dspi, tx_word);
 299
 300                 if (dspi->len == 0 || tx_count == DSPI_FIFO_SIZE - 1) {
 301                         /* last transfer in the transfer */
 302                         dspi_pushr |= SPI_PUSHR_EOQ;
 303                         if ((dspi->cs_change) && (!dspi->len))
 304                                 dspi_pushr &= ~SPI_PUSHR_CONT;
 305                 } else if (tx_word && (dspi->len == 1))
 306                         dspi_pushr |= SPI_PUSHR_EOQ;
 307
 308                 regmap_write(dspi->regmap, SPI_PUSHR, dspi_pushr);
 309
 310                 tx_count++;
 311         }
 312
 313         return tx_count * (tx_word + 1);
 314 }
 315
 316 static int dspi_eoq_read(struct fsl_dspi *dspi)
 317 {
 318         int rx_count = 0;
 319         int rx_word = is_double_byte_mode(dspi);
 320
 321         while ((dspi->rx < dspi->rx_end)
 322                         && (rx_count < DSPI_FIFO_SIZE)) {
 323                 if (rx_word && (dspi->rx_end - dspi->rx) == 1)
 324                         rx_word = 0;
 325
 326                 dspi_data_from_popr(dspi, rx_word);
 327                 rx_count++;
 328         }
 329
 330         return rx_count;
 331 }
 332
 333 static int dspi_tcfq_write(struct fsl_dspi *dspi)
 334 {
 335         int tx_word;
 336         u32 dspi_pushr = 0;
 337
 338         tx_word = is_double_byte_mode(dspi);
 339
 340         if (tx_word && (dspi->len == 1)) {
 341                 dspi->dataflags |= TRAN_STATE_WORD_ODD_NUM;
 342                 regmap_update_bits(dspi->regmap, SPI_CTAR(0),
 343                                 SPI_FRAME_BITS_MASK, SPI_FRAME_BITS(8));
 344                 tx_word = 0;
 345         }
 346
 347         dspi_pushr = dspi_data_to_pushr(dspi, tx_word);
 348
 349         if ((dspi->cs_change) && (!dspi->len))
 350                 dspi_pushr &= ~SPI_PUSHR_CONT;
 351
 352         regmap_write(dspi->regmap, SPI_PUSHR, dspi_pushr);
 353
 354         return tx_word + 1;
 355 }
 356
 357 static void dspi_tcfq_read(struct fsl_dspi *dspi)
 358 {
 359         int rx_word = is_double_byte_mode(dspi);
 360
 361         if (rx_word && (dspi->rx_end - dspi->rx) == 1)
 362                 rx_word = 0;
 363
 364         dspi_data_from_popr(dspi, rx_word);
 365 }
 366
 367 static int dspi_transfer_one_message(struct spi_master *master,
 368                 struct spi_message *message)
 369 {
 370         struct fsl_dspi *dspi = spi_master_get_devdata(master);
 371         struct spi_device *spi = message->spi;
 372         struct spi_transfer *transfer;
 373         int status = 0;
 374         enum dspi_trans_mode trans_mode;
 375         u32 spi_tcr;
 376
 377         regmap_read(dspi->regmap, SPI_TCR, &spi_tcr);
 378         dspi->spi_tcnt = SPI_TCR_GET_TCNT(spi_tcr);
 379
 380         message->actual_length = 0;
 381
 382         list_for_each_entry(transfer, &message->transfers, transfer_list) {
 383                 dspi->cur_transfer = transfer;
 384                 dspi->cur_msg = message;
 385                 dspi->cur_chip = spi_get_ctldata(spi);
 386                 dspi->cs = spi->chip_select;
 387                 dspi->cs_change = 0;
 388                 if (dspi->cur_transfer->transfer_list.next
 389                                 == &dspi->cur_msg->transfers)
 390                         dspi->cs_change = 1;
 391                 dspi->void_write_data = dspi->cur_chip->void_write_data;
 392
 393                 dspi->dataflags = 0;
 394                 dspi->tx = (void *)transfer->tx_buf;
 395                 dspi->tx_end = dspi->tx + transfer->len;
 396                 dspi->rx = transfer->rx_buf;
 397                 dspi->rx_end = dspi->rx + transfer->len;
 398                 dspi->len = transfer->len;
 399
 400                 if (!dspi->rx)
 401                         dspi->dataflags |= TRAN_STATE_RX_VOID;
 402
 403                 if (!dspi->tx)
 404                         dspi->dataflags |= TRAN_STATE_TX_VOID;
 405
 406                 regmap_write(dspi->regmap, SPI_MCR, dspi->cur_chip->mcr_val);
 407                 regmap_update_bits(dspi->regmap, SPI_MCR,
 408                                 SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF,
 409                                 SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF);
 410                 regmap_write(dspi->regmap, SPI_CTAR(0),
 411                                 dspi->cur_chip->ctar_val);
 412
 413                 trans_mode = dspi->devtype_data->trans_mode;
 414                 switch (trans_mode) {
 415                 case DSPI_EOQ_MODE:
 416                         regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_EOQFE);
 417                         dspi_eoq_write(dspi);
 418                         break;
 419                 case DSPI_TCFQ_MODE:
 420                         regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_TCFQE);
 421                         dspi_tcfq_write(dspi);
 422                         break;
 423                 default:
 424                         dev_err(&dspi->pdev->dev, "unsupported trans_mode %u\n",
 425                                 trans_mode);
 426                         status = -EINVAL;
 427                         goto out;
 428                 }
 429
 430                 if (wait_event_interruptible(dspi->waitq, dspi->waitflags))
 431                         dev_err(&dspi->pdev->dev, "wait transfer complete fail!\n");
 432                 dspi->waitflags = 0;
 433
 434                 if (transfer->delay_usecs)
 435                         udelay(transfer->delay_usecs);
 436         }
 437
 438 out:
 439         message->status = status;
 440         spi_finalize_current_message(master);
 441
 442         return status;
 443 }
 444
 445 static int dspi_setup(struct spi_device *spi)
 446 {
 447         struct chip_data *chip;
 448         struct fsl_dspi *dspi = spi_master_get_devdata(spi->master);
 449         u32 cs_sck_delay = 0, sck_cs_delay = 0;
 450         unsigned char br = 0, pbr = 0, pcssck = 0, cssck = 0;
 451         unsigned char pasc = 0, asc = 0, fmsz = 0;
 452         unsigned long clkrate;
 453
 454         if ((spi->bits_per_word >= 4) && (spi->bits_per_word <= 16)) {
 455                 fmsz = spi->bits_per_word - 1;
 456         } else {
 457                 pr_err("Invalid wordsize\n");
 458                 return -ENODEV;
 459         }
 460
 461         /* Only alloc on first setup */
 462         chip = spi_get_ctldata(spi);
 463         if (chip == NULL) {
 464                 chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
 465                 if (!chip)
 466                         return -ENOMEM;
 467         }
 468
 469         of_property_read_u32(spi->dev.of_node, "fsl,spi-cs-sck-delay",
 470                         &cs_sck_delay);
 471
 472         of_property_read_u32(spi->dev.of_node, "fsl,spi-sck-cs-delay",
 473                         &sck_cs_delay);
 474
 475         chip->mcr_val = SPI_MCR_MASTER | SPI_MCR_PCSIS |
 476                 SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF;
 477
 478         chip->void_write_data = 0;
 479
 480         clkrate = clk_get_rate(dspi->clk);
 481         hz_to_spi_baud(&pbr, &br, spi->max_speed_hz, clkrate);
 482
 483         /* Set PCS to SCK delay scale values */
 484         ns_delay_scale(&pcssck, &cssck, cs_sck_delay, clkrate);
 485
 486         /* Set After SCK delay scale values */
 487         ns_delay_scale(&pasc, &asc, sck_cs_delay, clkrate);
 488
 489         chip->ctar_val =  SPI_CTAR_FMSZ(fmsz)
 490                 | SPI_CTAR_CPOL(spi->mode & SPI_CPOL ? 1 : 0)
 491                 | SPI_CTAR_CPHA(spi->mode & SPI_CPHA ? 1 : 0)
 492                 | SPI_CTAR_LSBFE(spi->mode & SPI_LSB_FIRST ? 1 : 0)
 493                 | SPI_CTAR_PCSSCK(pcssck)
 494                 | SPI_CTAR_CSSCK(cssck)
 495                 | SPI_CTAR_PASC(pasc)
 496                 | SPI_CTAR_ASC(asc)
 497                 | SPI_CTAR_PBR(pbr)
 498                 | SPI_CTAR_BR(br);
 499
 500         spi_set_ctldata(spi, chip);
 501
 502         return 0;
 503 }
 504
 505 static void dspi_cleanup(struct spi_device *spi)
 506 {
 507         struct chip_data *chip = spi_get_ctldata((struct spi_device *)spi);
 508
 509         dev_dbg(&spi->dev, "spi_device %u.%u cleanup\n",
 510                         spi->master->bus_num, spi->chip_select);
 511
 512         kfree(chip);
 513 }
 514
 515 static irqreturn_t dspi_interrupt(int irq, void *dev_id)
 516 {
 517         struct fsl_dspi *dspi = (struct fsl_dspi *)dev_id;
 518         struct spi_message *msg = dspi->cur_msg;
 519         enum dspi_trans_mode trans_mode;
 520         u32 spi_sr, spi_tcr;
 521         u32 spi_tcnt, tcnt_diff;
 522         int tx_word;
 523
 524         regmap_read(dspi->regmap, SPI_SR, &spi_sr);
 525         regmap_write(dspi->regmap, SPI_SR, spi_sr);
 526
 527
 528         if (spi_sr & (SPI_SR_EOQF | SPI_SR_TCFQF)) {
 529                 tx_word = is_double_byte_mode(dspi);
 530
 531                 regmap_read(dspi->regmap, SPI_TCR, &spi_tcr);
 532                 spi_tcnt = SPI_TCR_GET_TCNT(spi_tcr);
 533                 /*
 534                  * The width of SPI Transfer Counter in SPI_TCR is 16bits,
 535                  * so the max couner is 65535. When the counter reach 65535,
 536                  * it will wrap around, counter reset to zero.
 537                  * spi_tcnt my be less than dspi->spi_tcnt, it means the
 538                  * counter already wrapped around.
 539                  * SPI Transfer Counter is a counter of transmitted frames.
 540                  * The size of frame maybe two bytes.
 541                  */
 542                 tcnt_diff = ((spi_tcnt + SPI_TCR_TCNT_MAX) - dspi->spi_tcnt)
 543                         % SPI_TCR_TCNT_MAX;
 544                 tcnt_diff *= (tx_word + 1);
 545                 if (dspi->dataflags & TRAN_STATE_WORD_ODD_NUM)
 546                         tcnt_diff--;
 547
 548                 msg->actual_length += tcnt_diff;
 549
 550                 dspi->spi_tcnt = spi_tcnt;
 551
 552                 trans_mode = dspi->devtype_data->trans_mode;
 553                 switch (trans_mode) {
 554                 case DSPI_EOQ_MODE:
 555                         dspi_eoq_read(dspi);
 556                         break;
 557                 case DSPI_TCFQ_MODE:
 558                         dspi_tcfq_read(dspi);
 559                         break;
 560                 default:
 561                         dev_err(&dspi->pdev->dev, "unsupported trans_mode %u\n",
 562                                 trans_mode);
 563                                 return IRQ_HANDLED;
 564                 }
 565
 566                 if (!dspi->len) {
 567                         if (dspi->dataflags & TRAN_STATE_WORD_ODD_NUM) {
 568                                 regmap_update_bits(dspi->regmap,
 569                                                    SPI_CTAR(0),
 570                                                    SPI_FRAME_BITS_MASK,
 571                                                    SPI_FRAME_BITS(16));
 572                                 dspi->dataflags &= ~TRAN_STATE_WORD_ODD_NUM;
 573                         }
 574
 575                         dspi->waitflags = 1;
 576                         wake_up_interruptible(&dspi->waitq);
 577                 } else {
 578                         switch (trans_mode) {
 579                         case DSPI_EOQ_MODE:
 580                                 dspi_eoq_write(dspi);
 581                                 break;
 582                         case DSPI_TCFQ_MODE:
 583                                 dspi_tcfq_write(dspi);
 584                                 break;
 585                         default:
 586                                 dev_err(&dspi->pdev->dev,
 587                                         "unsupported trans_mode %u\n",
 588                                         trans_mode);
 589                         }
 590                 }
 591         }
 592
 593         return IRQ_HANDLED;
 594 }
 595
 596 static const struct of_device_id fsl_dspi_dt_ids[] = {
 597         { .compatible = "fsl,vf610-dspi", .data = (void *)&vf610_data, },
 598         { .compatible = "fsl,ls1021a-v1.0-dspi",
 599                 .data = (void *)&ls1021a_v1_data, },
 600         { .compatible = "fsl,ls2085a-dspi", .data = (void *)&ls2085a_data, },
 601         { /* sentinel */ }
 602 };
 603 MODULE_DEVICE_TABLE(of, fsl_dspi_dt_ids);
 604
 605 #ifdef CONFIG_PM_SLEEP
 606 static int dspi_suspend(struct device *dev)
 607 {
 608         struct spi_master *master = dev_get_drvdata(dev);
 609         struct fsl_dspi *dspi = spi_master_get_devdata(master);
 610
 611         spi_master_suspend(master);
 612         clk_disable_unprepare(dspi->clk);
 613
 614         pinctrl_pm_select_sleep_state(dev);
 615
 616         return 0;
 617 }
 618
 619 static int dspi_resume(struct device *dev)
 620 {
 621         struct spi_master *master = dev_get_drvdata(dev);
 622         struct fsl_dspi *dspi = spi_master_get_devdata(master);
 623
 624         pinctrl_pm_select_default_state(dev);
 625
 626         clk_prepare_enable(dspi->clk);
 627         spi_master_resume(master);
 628
 629         return 0;
 630 }
 631 #endif /* CONFIG_PM_SLEEP */
 632
 633 static SIMPLE_DEV_PM_OPS(dspi_pm, dspi_suspend, dspi_resume);
 634
 635 static const struct regmap_config dspi_regmap_config = {
 636         .reg_bits = 32,
 637         .val_bits = 32,
 638         .reg_stride = 4,
 639         .max_register = 0x88,
 640 };
 641
 642 static int dspi_probe(struct platform_device *pdev)
 643 {
 644         struct device_node *np = pdev->dev.of_node;
 645         struct spi_master *master;
 646         struct fsl_dspi *dspi;
 647         struct resource *res;
 648         void __iomem *base;
 649         int ret = 0, cs_num, bus_num;
 650         const struct of_device_id *of_id =
 651                         of_match_device(fsl_dspi_dt_ids, &pdev->dev);
 652
 653         master = spi_alloc_master(&pdev->dev, sizeof(struct fsl_dspi));
 654         if (!master)
 655                 return -ENOMEM;
 656
 657         dspi = spi_master_get_devdata(master);
 658         dspi->pdev = pdev;
 659         dspi->master = master;
 660
 661         master->transfer = NULL;
 662         master->setup = dspi_setup;
 663         master->transfer_one_message = dspi_transfer_one_message;
 664         master->dev.of_node = pdev->dev.of_node;
 665
 666         master->cleanup = dspi_cleanup;
 667         master->mode_bits = SPI_CPOL | SPI_CPHA;
 668         master->bits_per_word_mask = SPI_BPW_MASK(4) | SPI_BPW_MASK(8) |
 669                                         SPI_BPW_MASK(16);
 670
 671         ret = of_property_read_u32(np, "spi-num-chipselects", &cs_num);
 672         if (ret < 0) {
 673                 dev_err(&pdev->dev, "can't get spi-num-chipselects\n");
 674                 goto out_master_put;
 675         }
 676         master->num_chipselect = cs_num;
 677
 678         ret = of_property_read_u32(np, "bus-num", &bus_num);
 679         if (ret < 0) {
 680                 dev_err(&pdev->dev, "can't get bus-num\n");
 681                 goto out_master_put;
 682         }
 683         master->bus_num = bus_num;
 684
 685         dspi->devtype_data = (struct fsl_dspi_devtype_data *)of_id->data;
 686         if (!dspi->devtype_data) {
 687                 dev_err(&pdev->dev, "can't get devtype_data\n");
 688                 ret = -EFAULT;
 689                 goto out_master_put;
 690         }
 691
 692         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 693         base = devm_ioremap_resource(&pdev->dev, res);
 694         if (IS_ERR(base)) {
 695                 ret = PTR_ERR(base);
 696                 goto out_master_put;
 697         }
 698
 699         dspi->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
 700                                                 &dspi_regmap_config);
 701         if (IS_ERR(dspi->regmap)) {
 702                 dev_err(&pdev->dev, "failed to init regmap: %ld\n",
 703                                 PTR_ERR(dspi->regmap));
 704                 return PTR_ERR(dspi->regmap);
 705         }
 706
 707         dspi->irq = platform_get_irq(pdev, 0);
 708         if (dspi->irq < 0) {
 709                 dev_err(&pdev->dev, "can't get platform irq\n");
 710                 ret = dspi->irq;
 711                 goto out_master_put;
 712         }
 713
 714         ret = devm_request_irq(&pdev->dev, dspi->irq, dspi_interrupt, 0,
 715                         pdev->name, dspi);
 716         if (ret < 0) {
 717                 dev_err(&pdev->dev, "Unable to attach DSPI interrupt\n");
 718                 goto out_master_put;
 719         }
 720
 721         dspi->clk = devm_clk_get(&pdev->dev, "dspi");
 722         if (IS_ERR(dspi->clk)) {
 723                 ret = PTR_ERR(dspi->clk);
 724                 dev_err(&pdev->dev, "unable to get clock\n");
 725                 goto out_master_put;
 726         }
 727         clk_prepare_enable(dspi->clk);
 728
 729         init_waitqueue_head(&dspi->waitq);
 730         platform_set_drvdata(pdev, master);
 731
 732         ret = spi_register_master(master);
 733         if (ret != 0) {
 734                 dev_err(&pdev->dev, "Problem registering DSPI master\n");
 735                 goto out_clk_put;
 736         }
 737
 738         return ret;
 739
 740 out_clk_put:
 741         clk_disable_unprepare(dspi->clk);
 742 out_master_put:
 743         spi_master_put(master);
 744
 745         return ret;
 746 }
 747
 748 static int dspi_remove(struct platform_device *pdev)
 749 {
 750         struct spi_master *master = platform_get_drvdata(pdev);
 751         struct fsl_dspi *dspi = spi_master_get_devdata(master);
 752
 753         /* Disconnect from the SPI framework */
 754         clk_disable_unprepare(dspi->clk);
 755         spi_unregister_master(dspi->master);
 756         spi_master_put(dspi->master);
 757
 758         return 0;
 759 }
 760
 761 static struct platform_driver fsl_dspi_driver = {
 762         .driver.name    = DRIVER_NAME,
 763         .driver.of_match_table = fsl_dspi_dt_ids,
 764         .driver.owner   = THIS_MODULE,
 765         .driver.pm = &dspi_pm,
 766         .probe          = dspi_probe,
 767         .remove         = dspi_remove,
 768 };
 769 module_platform_driver(fsl_dspi_driver);
 770
 771 MODULE_DESCRIPTION("Freescale DSPI Controller Driver");
 772 MODULE_LICENSE("GPL");
 773 MODULE_ALIAS("platform:" DRIVER_NAME);